tests/suites/test_suite_pk.function

/* BEGIN_HEADER */
#include "mbedtls/pk.h"

/* For error codes */
#include "mbedtls/asn1.h"
#include "mbedtls/base64.h"
#include "mbedtls/ecp.h"
#include "mbedtls/rsa.h"

#include <limits.h>
#include <stdint.h>

/* Needed only for test case data under #if defined(MBEDTLS_USE_PSA_CRYPTO),
 * but the test code generator requires test case data to be valid C code
 * unconditionally (https://github.com/Mbed-TLS/mbedtls/issues/2023). */
#include "psa/crypto.h"

#define RSA_KEY_SIZE 512
#define RSA_KEY_LEN   64

/** Generate a key of the desired type.
 *
 * \param pk        The PK object to fill. It must have been initialized
 *                  with mbedtls_pk_setup().
 * \param parameter - For RSA keys, the key size in bits.
 *                  - For EC keys, the curve (\c MBEDTLS_ECP_DP_xxx).
 *
 * \return          The status from the underlying type-specific key
 *                  generation function.
 * \return          -1 if the key type is not recognized.
 */
static int pk_genkey(mbedtls_pk_context *pk, int parameter)
{
    ((void) pk);
    (void) parameter;

#if defined(MBEDTLS_RSA_C) && defined(MBEDTLS_GENPRIME)
    if (mbedtls_pk_get_type(pk) == MBEDTLS_PK_RSA) {
        return mbedtls_rsa_gen_key(mbedtls_pk_rsa(*pk),
                                   mbedtls_test_rnd_std_rand, NULL,
                                   parameter, 3);
    }
#endif
#if defined(MBEDTLS_ECP_C)
    if (mbedtls_pk_get_type(pk) == MBEDTLS_PK_ECKEY ||
        mbedtls_pk_get_type(pk) == MBEDTLS_PK_ECKEY_DH ||
        mbedtls_pk_get_type(pk) == MBEDTLS_PK_ECDSA) {
        int ret;
        if ((ret = mbedtls_ecp_group_load(&mbedtls_pk_ec(*pk)->grp,
                                          parameter)) != 0) {
            return ret;
        }

        return mbedtls_ecp_gen_keypair(&mbedtls_pk_ec(*pk)->grp,
                                       &mbedtls_pk_ec(*pk)->d,
                                       &mbedtls_pk_ec(*pk)->Q,
                                       mbedtls_test_rnd_std_rand, NULL);
    }
#endif
    return -1;
}

#if defined(MBEDTLS_RSA_C)
int mbedtls_rsa_decrypt_func(void *ctx, int mode, size_t *olen,
                             const unsigned char *input, unsigned char *output,
                             size_t output_max_len)
{
    return mbedtls_rsa_pkcs1_decrypt((mbedtls_rsa_context *) ctx,
                                     mbedtls_test_rnd_std_rand, NULL, mode,
                                     olen, input, output, output_max_len);
}
int mbedtls_rsa_sign_func(void *ctx,
                          int (*f_rng)(void *, unsigned char *, size_t), void *p_rng,
                          int mode, mbedtls_md_type_t md_alg, unsigned int hashlen,
                          const unsigned char *hash, unsigned char *sig)
{
    ((void) f_rng);
    ((void) p_rng);
    return mbedtls_rsa_pkcs1_sign((mbedtls_rsa_context *) ctx,
                                  mbedtls_test_rnd_std_rand, NULL, mode,
                                  md_alg, hashlen, hash, sig);
}
size_t mbedtls_rsa_key_len_func(void *ctx)
{
    return ((const mbedtls_rsa_context *) ctx)->len;
}
#endif /* MBEDTLS_RSA_C */

#if defined(MBEDTLS_USE_PSA_CRYPTO)

/*
 * Generate a key using PSA and return the key identifier of that key,
 * or 0 if the key generation failed.
 * The key uses NIST P-256 and is usable for signing with SHA-256.
 */
mbedtls_svc_key_id_t pk_psa_genkey(void)
{
    mbedtls_svc_key_id_t key;
    psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
    const psa_key_type_t type =
        PSA_KEY_TYPE_ECC_KEY_PAIR(PSA_ECC_FAMILY_SECP_R1);
    const size_t bits = 256;

    psa_set_key_usage_flags(&attributes, PSA_KEY_USAGE_SIGN_HASH);
    psa_set_key_algorithm(&attributes, PSA_ALG_ECDSA(PSA_ALG_SHA_256));
    psa_set_key_type(&attributes, type);
    psa_set_key_bits(&attributes, bits);
    PSA_ASSERT(psa_generate_key(&attributes, &key));

exit:
    return key;
}
#endif /* MBEDTLS_USE_PSA_CRYPTO */
/* END_HEADER */

/* BEGIN_DEPENDENCIES
 * depends_on:MBEDTLS_PK_C
 * END_DEPENDENCIES
 */

/* BEGIN_CASE depends_on:MBEDTLS_USE_PSA_CRYPTO:MBEDTLS_ECDSA_C:MBEDTLS_ECP_DP_SECP256R1_ENABLED */
void pk_psa_utils()
{
    mbedtls_pk_context pk, pk2;
    mbedtls_svc_key_id_t key;
    psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;

    const char * const name = "Opaque";
    const size_t bitlen = 256; /* hardcoded in genkey() */

    mbedtls_md_type_t md_alg = MBEDTLS_MD_NONE;
    unsigned char b1[1], b2[1];
    size_t len;
    mbedtls_pk_debug_item dbg;

    PSA_ASSERT(psa_crypto_init());

    mbedtls_pk_init(&pk);
    mbedtls_pk_init(&pk2);

    TEST_ASSERT(psa_crypto_init() == PSA_SUCCESS);

    TEST_ASSERT(mbedtls_pk_setup_opaque(&pk, MBEDTLS_SVC_KEY_ID_INIT) ==
                MBEDTLS_ERR_PK_BAD_INPUT_DATA);

    mbedtls_pk_free(&pk);
    mbedtls_pk_init(&pk);

    key = pk_psa_genkey();
    if (mbedtls_svc_key_id_is_null(key)) {
        goto exit;
    }

    TEST_ASSERT(mbedtls_pk_setup_opaque(&pk, key) == 0);

    TEST_ASSERT(mbedtls_pk_get_type(&pk) == MBEDTLS_PK_OPAQUE);
    TEST_ASSERT(strcmp(mbedtls_pk_get_name(&pk), name) == 0);

    TEST_ASSERT(mbedtls_pk_get_bitlen(&pk) == bitlen);
    TEST_ASSERT(mbedtls_pk_get_len(&pk) == bitlen / 8);

    TEST_ASSERT(mbedtls_pk_can_do(&pk, MBEDTLS_PK_ECKEY) == 1);
    TEST_ASSERT(mbedtls_pk_can_do(&pk, MBEDTLS_PK_ECDSA) == 1);
    TEST_ASSERT(mbedtls_pk_can_do(&pk, MBEDTLS_PK_RSA) == 0);

    /* unsupported operations: verify, decrypt, encrypt */
    TEST_ASSERT(mbedtls_pk_verify(&pk, md_alg,
                                  b1, sizeof(b1), b2, sizeof(b2))
                == MBEDTLS_ERR_PK_TYPE_MISMATCH);
    TEST_ASSERT(mbedtls_pk_decrypt(&pk, b1, sizeof(b1),
                                   b2, &len, sizeof(b2),
                                   NULL, NULL)
                == MBEDTLS_ERR_PK_TYPE_MISMATCH);
    TEST_ASSERT(mbedtls_pk_encrypt(&pk, b1, sizeof(b1),
                                   b2, &len, sizeof(b2),
                                   NULL, NULL)
                == MBEDTLS_ERR_PK_TYPE_MISMATCH);

    /* unsupported functions: check_pair, debug */
    TEST_ASSERT(mbedtls_pk_setup(&pk2,
                                 mbedtls_pk_info_from_type(MBEDTLS_PK_ECKEY)) == 0);
    TEST_ASSERT(mbedtls_pk_check_pair(&pk, &pk2)
                == MBEDTLS_ERR_PK_TYPE_MISMATCH);
    TEST_ASSERT(mbedtls_pk_debug(&pk, &dbg)
                == MBEDTLS_ERR_PK_TYPE_MISMATCH);

    /* test that freeing the context does not destroy the key */
    mbedtls_pk_free(&pk);
    TEST_ASSERT(PSA_SUCCESS == psa_get_key_attributes(key, &attributes));
    TEST_ASSERT(PSA_SUCCESS == psa_destroy_key(key));

exit:
    /*
     * Key attributes may have been returned by psa_get_key_attributes()
     * thus reset them as required.
     */
    psa_reset_key_attributes(&attributes);

    mbedtls_pk_free(&pk);   /* redundant except upon error */
    mbedtls_pk_free(&pk2);
    USE_PSA_DONE();
}
/* END_CASE */


/* BEGIN_CASE */
void valid_parameters()
{
    mbedtls_pk_context pk;
    unsigned char buf[1];
    size_t len;
    void *options = NULL;

    mbedtls_pk_init(&pk);

    TEST_VALID_PARAM(mbedtls_pk_free(NULL));

#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
    TEST_VALID_PARAM(mbedtls_pk_restart_free(NULL));
#endif

    TEST_ASSERT(mbedtls_pk_setup(&pk, NULL) ==
                MBEDTLS_ERR_PK_BAD_INPUT_DATA);

    /* In informational functions, we accept NULL where a context pointer
     * is expected because that's what the library has done forever.
     * We do not document that NULL is accepted, so we may wish to change
     * the behavior in a future version. */
    TEST_ASSERT(mbedtls_pk_get_bitlen(NULL) == 0);
    TEST_ASSERT(mbedtls_pk_get_len(NULL) == 0);
    TEST_ASSERT(mbedtls_pk_can_do(NULL, MBEDTLS_PK_NONE) == 0);

    TEST_ASSERT(mbedtls_pk_sign_restartable(&pk,
                                            MBEDTLS_MD_NONE,
                                            NULL, 0,
                                            buf, &len,
                                            mbedtls_test_rnd_std_rand, NULL,
                                            NULL) ==
                MBEDTLS_ERR_PK_BAD_INPUT_DATA);

    TEST_ASSERT(mbedtls_pk_sign_restartable(&pk,
                                            MBEDTLS_MD_NONE,
                                            NULL, 0,
                                            buf, &len,
                                            mbedtls_test_rnd_std_rand, NULL,
                                            NULL) ==
                MBEDTLS_ERR_PK_BAD_INPUT_DATA);

    TEST_ASSERT(mbedtls_pk_sign(&pk,
                                MBEDTLS_MD_NONE,
                                NULL, 0,
                                buf, &len,
                                mbedtls_test_rnd_std_rand, NULL) ==
                MBEDTLS_ERR_PK_BAD_INPUT_DATA);

    TEST_ASSERT(mbedtls_pk_verify_restartable(&pk,
                                              MBEDTLS_MD_NONE,
                                              NULL, 0,
                                              buf, sizeof(buf),
                                              NULL) ==
                MBEDTLS_ERR_PK_BAD_INPUT_DATA);

    TEST_ASSERT(mbedtls_pk_verify(&pk,
                                  MBEDTLS_MD_NONE,
                                  NULL, 0,
                                  buf, sizeof(buf)) ==
                MBEDTLS_ERR_PK_BAD_INPUT_DATA);

    TEST_ASSERT(mbedtls_pk_verify_ext(MBEDTLS_PK_NONE, options,
                                      &pk,
                                      MBEDTLS_MD_NONE,
                                      NULL, 0,
                                      buf, sizeof(buf)) ==
                MBEDTLS_ERR_PK_BAD_INPUT_DATA);

    TEST_ASSERT(mbedtls_pk_encrypt(&pk,
                                   NULL, 0,
                                   NULL, &len, 0,
                                   mbedtls_test_rnd_std_rand, NULL) ==
                MBEDTLS_ERR_PK_BAD_INPUT_DATA);

    TEST_ASSERT(mbedtls_pk_decrypt(&pk,
                                   NULL, 0,
                                   NULL, &len, 0,
                                   mbedtls_test_rnd_std_rand, NULL) ==
                MBEDTLS_ERR_PK_BAD_INPUT_DATA);

#if defined(MBEDTLS_PK_PARSE_C)
    TEST_ASSERT(mbedtls_pk_parse_key(&pk, NULL, 0, NULL, 1) ==
                MBEDTLS_ERR_PK_KEY_INVALID_FORMAT);

    TEST_ASSERT(mbedtls_pk_parse_public_key(&pk, NULL, 0) ==
                MBEDTLS_ERR_PK_KEY_INVALID_FORMAT);
#endif /* MBEDTLS_PK_PARSE_C */
}
/* END_CASE */

/* BEGIN_CASE depends_on:MBEDTLS_PK_WRITE_C */
void valid_parameters_pkwrite(data_t *key_data)
{
    mbedtls_pk_context pk;

    /* For the write tests to be effective, we need a valid key pair. */
    mbedtls_pk_init(&pk);
    TEST_ASSERT(mbedtls_pk_parse_key(&pk,
                                     key_data->x, key_data->len,
                                     NULL, 0) == 0);

    TEST_ASSERT(mbedtls_pk_write_key_der(&pk, NULL, 0) ==
                MBEDTLS_ERR_ASN1_BUF_TOO_SMALL);

    TEST_ASSERT(mbedtls_pk_write_pubkey_der(&pk, NULL, 0) ==
                MBEDTLS_ERR_ASN1_BUF_TOO_SMALL);

#if defined(MBEDTLS_PEM_WRITE_C)
    TEST_ASSERT(mbedtls_pk_write_key_pem(&pk, NULL, 0) ==
                MBEDTLS_ERR_BASE64_BUFFER_TOO_SMALL);

    TEST_ASSERT(mbedtls_pk_write_pubkey_pem(&pk, NULL, 0) ==
                MBEDTLS_ERR_BASE64_BUFFER_TOO_SMALL);
#endif /* MBEDTLS_PEM_WRITE_C */

exit:
    mbedtls_pk_free(&pk);
}
/* END_CASE */

/* BEGIN_CASE depends_on:MBEDTLS_CHECK_PARAMS:!MBEDTLS_PARAM_FAILED_ALT */
void invalid_parameters()
{
    size_t len;
    unsigned char *null_buf = NULL;
    unsigned char buf[1];
    unsigned char *p = buf;
    char str[1] = { 0 };
    mbedtls_pk_context pk;
    mbedtls_md_type_t valid_md = MBEDTLS_MD_SHA256;
    void *options = buf;

    (void) null_buf;
    (void) p;
    (void) str;

    mbedtls_pk_init(&pk);

    TEST_INVALID_PARAM(mbedtls_pk_init(NULL));

#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
    TEST_INVALID_PARAM(mbedtls_pk_restart_init(NULL));
#endif

    TEST_INVALID_PARAM_RET(MBEDTLS_ERR_PK_BAD_INPUT_DATA,
                           mbedtls_pk_setup(NULL, NULL));

#if defined(MBEDTLS_PK_RSA_ALT_SUPPORT)
    TEST_INVALID_PARAM_RET(MBEDTLS_ERR_PK_BAD_INPUT_DATA,
                           mbedtls_pk_setup_rsa_alt(NULL, buf,
                                                    NULL, NULL, NULL));
#endif

    TEST_INVALID_PARAM_RET(MBEDTLS_ERR_PK_BAD_INPUT_DATA,
                           mbedtls_pk_verify_restartable(NULL,
                                                         MBEDTLS_MD_NONE,
                                                         buf, sizeof(buf),
                                                         buf, sizeof(buf),
                                                         NULL));
    TEST_INVALID_PARAM_RET(MBEDTLS_ERR_PK_BAD_INPUT_DATA,
                           mbedtls_pk_verify_restartable(&pk,
                                                         MBEDTLS_MD_NONE,
                                                         NULL, sizeof(buf),
                                                         buf, sizeof(buf),
                                                         NULL));
    TEST_INVALID_PARAM_RET(MBEDTLS_ERR_PK_BAD_INPUT_DATA,
                           mbedtls_pk_verify_restartable(&pk,
                                                         valid_md,
                                                         NULL, 0,
                                                         buf, sizeof(buf),
                                                         NULL));
    TEST_INVALID_PARAM_RET(MBEDTLS_ERR_PK_BAD_INPUT_DATA,
                           mbedtls_pk_verify_restartable(&pk,
                                                         MBEDTLS_MD_NONE,
                                                         buf, sizeof(buf),
                                                         NULL, sizeof(buf),
                                                         NULL));

    TEST_INVALID_PARAM_RET(MBEDTLS_ERR_PK_BAD_INPUT_DATA,
                           mbedtls_pk_verify(NULL,
                                             MBEDTLS_MD_NONE,
                                             buf, sizeof(buf),
                                             buf, sizeof(buf)));
    TEST_INVALID_PARAM_RET(MBEDTLS_ERR_PK_BAD_INPUT_DATA,
                           mbedtls_pk_verify(&pk,
                                             MBEDTLS_MD_NONE,
                                             NULL, sizeof(buf),
                                             buf, sizeof(buf)));
    TEST_INVALID_PARAM_RET(MBEDTLS_ERR_PK_BAD_INPUT_DATA,
                           mbedtls_pk_verify(&pk,
                                             valid_md,
                                             NULL, 0,
                                             buf, sizeof(buf)));
    TEST_INVALID_PARAM_RET(MBEDTLS_ERR_PK_BAD_INPUT_DATA,
                           mbedtls_pk_verify(&pk,
                                             MBEDTLS_MD_NONE,
                                             buf, sizeof(buf),
                                             NULL, sizeof(buf)));

    TEST_INVALID_PARAM_RET(MBEDTLS_ERR_PK_BAD_INPUT_DATA,
                           mbedtls_pk_verify_ext(MBEDTLS_PK_NONE, options,
                                                 NULL,
                                                 MBEDTLS_MD_NONE,
                                                 buf, sizeof(buf),
                                                 buf, sizeof(buf)));
    TEST_INVALID_PARAM_RET(MBEDTLS_ERR_PK_BAD_INPUT_DATA,
                           mbedtls_pk_verify_ext(MBEDTLS_PK_NONE, options,
                                                 &pk,
                                                 MBEDTLS_MD_NONE,
                                                 NULL, sizeof(buf),
                                                 buf, sizeof(buf)));
    TEST_INVALID_PARAM_RET(MBEDTLS_ERR_PK_BAD_INPUT_DATA,
                           mbedtls_pk_verify_ext(MBEDTLS_PK_NONE, options,
                                                 &pk,
                                                 valid_md,
                                                 NULL, 0,
                                                 buf, sizeof(buf)));
    TEST_INVALID_PARAM_RET(MBEDTLS_ERR_PK_BAD_INPUT_DATA,
                           mbedtls_pk_verify_ext(MBEDTLS_PK_NONE, options,
                                                 &pk,
                                                 MBEDTLS_MD_NONE,
                                                 buf, sizeof(buf),
                                                 NULL, sizeof(buf)));

    TEST_INVALID_PARAM_RET(MBEDTLS_ERR_PK_BAD_INPUT_DATA,
                           mbedtls_pk_sign_restartable(NULL, MBEDTLS_MD_NONE, buf, sizeof(buf),
                                                       buf, &len, mbedtls_test_rnd_std_rand,
                                                       NULL, NULL));

    TEST_INVALID_PARAM_RET(MBEDTLS_ERR_PK_BAD_INPUT_DATA,
                           mbedtls_pk_sign_restartable(&pk, MBEDTLS_MD_NONE, NULL, sizeof(buf),
                                                       buf, &len, mbedtls_test_rnd_std_rand,
                                                       NULL, NULL));

    TEST_INVALID_PARAM_RET(MBEDTLS_ERR_PK_BAD_INPUT_DATA,
                           mbedtls_pk_sign_restartable(&pk, valid_md, NULL, 0, buf, &len,
                                                       mbedtls_test_rnd_std_rand, NULL, NULL));

    TEST_INVALID_PARAM_RET(MBEDTLS_ERR_PK_BAD_INPUT_DATA,
                           mbedtls_pk_sign_restartable(&pk, MBEDTLS_MD_NONE, buf, sizeof(buf),
                                                       NULL, &len, mbedtls_test_rnd_std_rand,
                                                       NULL, NULL));

    TEST_INVALID_PARAM_RET(MBEDTLS_ERR_PK_BAD_INPUT_DATA,
                           mbedtls_pk_sign(NULL, MBEDTLS_MD_NONE, buf, sizeof(buf),
                                           buf, &len, mbedtls_test_rnd_std_rand, NULL));

    TEST_INVALID_PARAM_RET(MBEDTLS_ERR_PK_BAD_INPUT_DATA,
                           mbedtls_pk_sign(&pk, MBEDTLS_MD_NONE, NULL, sizeof(buf),
                                           buf, &len, mbedtls_test_rnd_std_rand, NULL));

    TEST_INVALID_PARAM_RET(MBEDTLS_ERR_PK_BAD_INPUT_DATA,
                           mbedtls_pk_sign(&pk, valid_md, NULL, 0, buf, &len,
                                           mbedtls_test_rnd_std_rand, NULL));

    TEST_INVALID_PARAM_RET(MBEDTLS_ERR_PK_BAD_INPUT_DATA,
                           mbedtls_pk_sign(&pk, MBEDTLS_MD_NONE, buf, sizeof(buf), NULL, &len,
                                           mbedtls_test_rnd_std_rand, NULL));

    TEST_INVALID_PARAM_RET(MBEDTLS_ERR_PK_BAD_INPUT_DATA,
                           mbedtls_pk_decrypt(NULL, buf, sizeof(buf), buf, &len, sizeof(buf),
                                              mbedtls_test_rnd_std_rand, NULL));

    TEST_INVALID_PARAM_RET(MBEDTLS_ERR_PK_BAD_INPUT_DATA,
                           mbedtls_pk_decrypt(&pk, NULL, sizeof(buf), buf, &len, sizeof(buf),
                                              mbedtls_test_rnd_std_rand, NULL));

    TEST_INVALID_PARAM_RET(MBEDTLS_ERR_PK_BAD_INPUT_DATA,
                           mbedtls_pk_decrypt(&pk, buf, sizeof(buf), NULL, &len, sizeof(buf),
                                              mbedtls_test_rnd_std_rand, NULL));

    TEST_INVALID_PARAM_RET(MBEDTLS_ERR_PK_BAD_INPUT_DATA,
                           mbedtls_pk_decrypt(&pk, buf, sizeof(buf), buf, NULL, sizeof(buf),
                                              mbedtls_test_rnd_std_rand, NULL));

    TEST_INVALID_PARAM_RET(MBEDTLS_ERR_PK_BAD_INPUT_DATA,
                           mbedtls_pk_encrypt(NULL, buf, sizeof(buf), buf, &len, sizeof(buf),
                                              mbedtls_test_rnd_std_rand, NULL));

    TEST_INVALID_PARAM_RET(MBEDTLS_ERR_PK_BAD_INPUT_DATA,
                           mbedtls_pk_encrypt(&pk, NULL, sizeof(buf), buf, &len, sizeof(buf),
                                              mbedtls_test_rnd_std_rand, NULL));

    TEST_INVALID_PARAM_RET(MBEDTLS_ERR_PK_BAD_INPUT_DATA,
                           mbedtls_pk_encrypt(&pk, buf, sizeof(buf), NULL, &len, sizeof(buf),
                                              mbedtls_test_rnd_std_rand, NULL));

    TEST_INVALID_PARAM_RET(MBEDTLS_ERR_PK_BAD_INPUT_DATA,
                           mbedtls_pk_encrypt(&pk, buf, sizeof(buf), buf, NULL, sizeof(buf),
                                              mbedtls_test_rnd_std_rand, NULL));

    TEST_INVALID_PARAM_RET(MBEDTLS_ERR_PK_BAD_INPUT_DATA,
                           mbedtls_pk_check_pair(NULL, &pk));
    TEST_INVALID_PARAM_RET(MBEDTLS_ERR_PK_BAD_INPUT_DATA,
                           mbedtls_pk_check_pair(&pk, NULL));

    TEST_INVALID_PARAM_RET(MBEDTLS_ERR_PK_BAD_INPUT_DATA,
                           mbedtls_pk_debug(NULL, NULL));

#if defined(MBEDTLS_PK_PARSE_C)
#if defined(MBEDTLS_FS_IO)
    TEST_INVALID_PARAM_RET(MBEDTLS_ERR_PK_BAD_INPUT_DATA,
                           mbedtls_pk_load_file(NULL, &p, &len));
    TEST_INVALID_PARAM_RET(MBEDTLS_ERR_PK_BAD_INPUT_DATA,
                           mbedtls_pk_load_file(str, NULL, &len));
    TEST_INVALID_PARAM_RET(MBEDTLS_ERR_PK_BAD_INPUT_DATA,
                           mbedtls_pk_load_file(str, &p, NULL));

    TEST_INVALID_PARAM_RET(MBEDTLS_ERR_PK_BAD_INPUT_DATA,
                           mbedtls_pk_parse_keyfile(NULL, str, NULL));
    TEST_INVALID_PARAM_RET(MBEDTLS_ERR_PK_BAD_INPUT_DATA,
                           mbedtls_pk_parse_keyfile(&pk, NULL, NULL));

    TEST_INVALID_PARAM_RET(MBEDTLS_ERR_PK_BAD_INPUT_DATA,
                           mbedtls_pk_parse_public_keyfile(NULL, str));
    TEST_INVALID_PARAM_RET(MBEDTLS_ERR_PK_BAD_INPUT_DATA,
                           mbedtls_pk_parse_public_keyfile(&pk, NULL));
#endif

    TEST_INVALID_PARAM_RET(MBEDTLS_ERR_PK_BAD_INPUT_DATA,
                           mbedtls_pk_parse_subpubkey(NULL, buf, &pk));
    TEST_INVALID_PARAM_RET(MBEDTLS_ERR_PK_BAD_INPUT_DATA,
                           mbedtls_pk_parse_subpubkey(&null_buf, buf, &pk));
    TEST_INVALID_PARAM_RET(MBEDTLS_ERR_PK_BAD_INPUT_DATA,
                           mbedtls_pk_parse_subpubkey(&p, NULL, &pk));
    TEST_INVALID_PARAM_RET(MBEDTLS_ERR_PK_BAD_INPUT_DATA,
                           mbedtls_pk_parse_subpubkey(&p, buf, NULL));

    TEST_INVALID_PARAM_RET(MBEDTLS_ERR_PK_BAD_INPUT_DATA,
                           mbedtls_pk_parse_key(NULL,
                                                buf, sizeof(buf),
                                                buf, sizeof(buf)));
    TEST_INVALID_PARAM_RET(MBEDTLS_ERR_PK_BAD_INPUT_DATA,
                           mbedtls_pk_parse_key(&pk,
                                                NULL, sizeof(buf),
                                                buf, sizeof(buf)));

    TEST_INVALID_PARAM_RET(MBEDTLS_ERR_PK_BAD_INPUT_DATA,
                           mbedtls_pk_parse_public_key(NULL,
                                                       buf, sizeof(buf)));
    TEST_INVALID_PARAM_RET(MBEDTLS_ERR_PK_BAD_INPUT_DATA,
                           mbedtls_pk_parse_public_key(&pk,
                                                       NULL, sizeof(buf)));
#endif /* MBEDTLS_PK_PARSE_C */

#if defined(MBEDTLS_PK_WRITE_C)
    TEST_INVALID_PARAM_RET(MBEDTLS_ERR_PK_BAD_INPUT_DATA,
                           mbedtls_pk_write_pubkey(NULL, p, &pk));
    TEST_INVALID_PARAM_RET(MBEDTLS_ERR_PK_BAD_INPUT_DATA,
                           mbedtls_pk_write_pubkey(&null_buf, p, &pk));
    TEST_INVALID_PARAM_RET(MBEDTLS_ERR_PK_BAD_INPUT_DATA,
                           mbedtls_pk_write_pubkey(&p, NULL, &pk));
    TEST_INVALID_PARAM_RET(MBEDTLS_ERR_PK_BAD_INPUT_DATA,
                           mbedtls_pk_write_pubkey(&p, p, NULL));

    TEST_INVALID_PARAM_RET(MBEDTLS_ERR_PK_BAD_INPUT_DATA,
                           mbedtls_pk_write_pubkey_der(NULL,
                                                       buf, sizeof(buf)));
    TEST_INVALID_PARAM_RET(MBEDTLS_ERR_PK_BAD_INPUT_DATA,
                           mbedtls_pk_write_pubkey_der(&pk,
                                                       NULL, sizeof(buf)));

    TEST_INVALID_PARAM_RET(MBEDTLS_ERR_PK_BAD_INPUT_DATA,
                           mbedtls_pk_write_key_der(NULL,
                                                    buf, sizeof(buf)));
    TEST_INVALID_PARAM_RET(MBEDTLS_ERR_PK_BAD_INPUT_DATA,
                           mbedtls_pk_write_key_der(&pk,
                                                    NULL, sizeof(buf)));

#if defined(MBEDTLS_PEM_WRITE_C)
    TEST_INVALID_PARAM_RET(MBEDTLS_ERR_PK_BAD_INPUT_DATA,
                           mbedtls_pk_write_pubkey_pem(NULL,
                                                       buf, sizeof(buf)));
    TEST_INVALID_PARAM_RET(MBEDTLS_ERR_PK_BAD_INPUT_DATA,
                           mbedtls_pk_write_pubkey_pem(&pk,
                                                       NULL, sizeof(buf)));

    TEST_INVALID_PARAM_RET(MBEDTLS_ERR_PK_BAD_INPUT_DATA,
                           mbedtls_pk_write_key_pem(NULL,
                                                    buf, sizeof(buf)));
    TEST_INVALID_PARAM_RET(MBEDTLS_ERR_PK_BAD_INPUT_DATA,
                           mbedtls_pk_write_key_pem(&pk,
                                                    NULL, sizeof(buf)));
#endif /* MBEDTLS_PEM_WRITE_C */

#endif /* MBEDTLS_PK_WRITE_C */
}
/* END_CASE */

/* BEGIN_CASE */
void pk_utils(int type, int parameter, int bitlen, int len, char *name)
{
    mbedtls_pk_context pk;

    mbedtls_pk_init(&pk);

    TEST_ASSERT(mbedtls_pk_setup(&pk, mbedtls_pk_info_from_type(type)) == 0);
    TEST_ASSERT(pk_genkey(&pk, parameter) == 0);

    TEST_ASSERT((int) mbedtls_pk_get_type(&pk) == type);
    TEST_ASSERT(mbedtls_pk_can_do(&pk, type));
    TEST_ASSERT(mbedtls_pk_get_bitlen(&pk) == (unsigned) bitlen);
    TEST_ASSERT(mbedtls_pk_get_len(&pk) == (unsigned) len);
    TEST_ASSERT(strcmp(mbedtls_pk_get_name(&pk), name) == 0);

exit:
    mbedtls_pk_free(&pk);
}
/* END_CASE */

/* BEGIN_CASE depends_on:MBEDTLS_PK_PARSE_C:MBEDTLS_FS_IO */
void mbedtls_pk_check_pair(char *pub_file, char *prv_file, int ret)
{
    mbedtls_pk_context pub, prv, alt;

    mbedtls_pk_init(&pub);
    mbedtls_pk_init(&prv);
    mbedtls_pk_init(&alt);

    TEST_ASSERT(mbedtls_pk_parse_public_keyfile(&pub, pub_file) == 0);
    TEST_ASSERT(mbedtls_pk_parse_keyfile(&prv, prv_file, NULL) == 0);

    TEST_ASSERT(mbedtls_pk_check_pair(&pub, &prv) == ret);

#if defined(MBEDTLS_RSA_C) && defined(MBEDTLS_PK_RSA_ALT_SUPPORT)
    if (mbedtls_pk_get_type(&prv) == MBEDTLS_PK_RSA) {
        TEST_ASSERT(mbedtls_pk_setup_rsa_alt(&alt, mbedtls_pk_rsa(prv),
                                             mbedtls_rsa_decrypt_func, mbedtls_rsa_sign_func,
                                             mbedtls_rsa_key_len_func) == 0);
        TEST_ASSERT(mbedtls_pk_check_pair(&pub, &alt) == ret);
    }
#endif

    mbedtls_pk_free(&pub);
    mbedtls_pk_free(&prv);
    mbedtls_pk_free(&alt);
}
/* END_CASE */

/* BEGIN_CASE depends_on:MBEDTLS_RSA_C */
void pk_rsa_verify_test_vec(data_t *message_str, int digest, int mod,
                            char *input_N, char *input_E,
                            data_t *result_str, int result)
{
    unsigned char hash_result[MBEDTLS_MD_MAX_SIZE];
    mbedtls_rsa_context *rsa;
    mbedtls_pk_context pk;
    mbedtls_pk_restart_ctx *rs_ctx = NULL;
#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
    mbedtls_pk_restart_ctx ctx;

    rs_ctx = &ctx;
    mbedtls_pk_restart_init(rs_ctx);
    // this setting would ensure restart would happen if ECC was used
    mbedtls_ecp_set_max_ops(1);
#endif

    mbedtls_pk_init(&pk);

    memset(hash_result, 0x00, MBEDTLS_MD_MAX_SIZE);

    TEST_ASSERT(mbedtls_pk_setup(&pk, mbedtls_pk_info_from_type(MBEDTLS_PK_RSA)) == 0);
    rsa = mbedtls_pk_rsa(pk);

    rsa->len = mod / 8;
    TEST_ASSERT(mbedtls_test_read_mpi(&rsa->N, input_N) == 0);
    TEST_ASSERT(mbedtls_test_read_mpi(&rsa->E, input_E) == 0);


    if (mbedtls_md_info_from_type(digest) != NULL) {
        TEST_ASSERT(mbedtls_md(mbedtls_md_info_from_type(digest), message_str->x, message_str->len,
                               hash_result) == 0);
    }

    TEST_ASSERT(mbedtls_pk_verify(&pk, digest, hash_result, 0,
                                  result_str->x, mbedtls_pk_get_len(&pk)) == result);

    TEST_ASSERT(mbedtls_pk_verify_restartable(&pk, digest, hash_result, 0,
                                              result_str->x, mbedtls_pk_get_len(
                                                  &pk), rs_ctx) == result);

exit:
#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
    mbedtls_pk_restart_free(rs_ctx);
#endif
    mbedtls_pk_free(&pk);
}
/* END_CASE */

/* BEGIN_CASE depends_on:MBEDTLS_RSA_C */
void pk_rsa_verify_ext_test_vec(data_t *message_str, int digest,
                                int mod, char *input_N,
                                char *input_E, data_t *result_str,
                                int pk_type, int mgf1_hash_id,
                                int salt_len, int result)
{
    unsigned char hash_result[MBEDTLS_MD_MAX_SIZE];
    mbedtls_rsa_context *rsa;
    mbedtls_pk_context pk;
    mbedtls_pk_rsassa_pss_options pss_opts;
    void *options;
    size_t hash_len;

    mbedtls_pk_init(&pk);

    memset(hash_result, 0x00, sizeof(hash_result));

    TEST_ASSERT(mbedtls_pk_setup(&pk, mbedtls_pk_info_from_type(MBEDTLS_PK_RSA)) == 0);
    rsa = mbedtls_pk_rsa(pk);

    rsa->len = mod / 8;
    TEST_ASSERT(mbedtls_test_read_mpi(&rsa->N, input_N) == 0);
    TEST_ASSERT(mbedtls_test_read_mpi(&rsa->E, input_E) == 0);


    if (digest != MBEDTLS_MD_NONE) {
        TEST_ASSERT(mbedtls_md(mbedtls_md_info_from_type(digest),
                               message_str->x, message_str->len, hash_result) == 0);
        hash_len = 0;
    } else {
        memcpy(hash_result, message_str->x, message_str->len);
        hash_len = message_str->len;
    }

    if (mgf1_hash_id < 0) {
        options = NULL;
    } else {
        options = &pss_opts;

        pss_opts.mgf1_hash_id = mgf1_hash_id;
        pss_opts.expected_salt_len = salt_len;
    }

    TEST_ASSERT(mbedtls_pk_verify_ext(pk_type, options, &pk,
                                      digest, hash_result, hash_len,
                                      result_str->x, mbedtls_pk_get_len(&pk)) == result);

exit:
    mbedtls_pk_free(&pk);
}
/* END_CASE */

/* BEGIN_CASE depends_on:MBEDTLS_ECDSA_C */
void pk_ec_test_vec(int type, int id, data_t *key, data_t *hash,
                    data_t *sig, int ret)
{
    mbedtls_pk_context pk;
    mbedtls_ecp_keypair *eckey;

    mbedtls_pk_init(&pk);
    USE_PSA_INIT();

    TEST_ASSERT(mbedtls_pk_setup(&pk, mbedtls_pk_info_from_type(type)) == 0);

    TEST_ASSERT(mbedtls_pk_can_do(&pk, MBEDTLS_PK_ECDSA));
    eckey = mbedtls_pk_ec(pk);

    TEST_ASSERT(mbedtls_ecp_group_load(&eckey->grp, id) == 0);
    TEST_ASSERT(mbedtls_ecp_point_read_binary(&eckey->grp, &eckey->Q,
                                              key->x, key->len) == 0);

    // MBEDTLS_MD_NONE is used since it will be ignored.
    TEST_ASSERT(mbedtls_pk_verify(&pk, MBEDTLS_MD_NONE,
                                  hash->x, hash->len, sig->x, sig->len) == ret);

exit:
    mbedtls_pk_free(&pk);
    USE_PSA_DONE();
}
/* END_CASE */

/* BEGIN_CASE depends_on:MBEDTLS_ECP_RESTARTABLE:MBEDTLS_ECDSA_C:MBEDTLS_ECDSA_DETERMINISTIC */
void pk_sign_verify_restart(int pk_type, int grp_id, char *d_str,
                            char *QX_str, char *QY_str,
                            int md_alg, char *msg, data_t *sig_check,
                            int max_ops, int min_restart, int max_restart)
{
    int ret, cnt_restart;
    mbedtls_pk_restart_ctx rs_ctx;
    mbedtls_pk_context prv, pub;
    unsigned char hash[MBEDTLS_MD_MAX_SIZE];
    unsigned char sig[MBEDTLS_ECDSA_MAX_LEN];
    size_t hlen, slen;
    const mbedtls_md_info_t *md_info;

    mbedtls_pk_restart_init(&rs_ctx);
    mbedtls_pk_init(&prv);
    mbedtls_pk_init(&pub);
    memset(hash, 0, sizeof(hash));
    memset(sig, 0, sizeof(sig));

    TEST_ASSERT(mbedtls_pk_setup(&prv, mbedtls_pk_info_from_type(pk_type)) == 0);
    TEST_ASSERT(mbedtls_ecp_group_load(&mbedtls_pk_ec(prv)->grp, grp_id) == 0);
    TEST_ASSERT(mbedtls_test_read_mpi(&mbedtls_pk_ec(prv)->d, d_str) == 0);

    TEST_ASSERT(mbedtls_pk_setup(&pub, mbedtls_pk_info_from_type(pk_type)) == 0);
    TEST_ASSERT(mbedtls_ecp_group_load(&mbedtls_pk_ec(pub)->grp, grp_id) == 0);
    TEST_ASSERT(mbedtls_ecp_point_read_string(&mbedtls_pk_ec(pub)->Q, 16, QX_str, QY_str) == 0);

    md_info = mbedtls_md_info_from_type(md_alg);
    TEST_ASSERT(md_info != NULL);

    hlen = mbedtls_md_get_size(md_info);
    TEST_ASSERT(mbedtls_md(md_info,
                           (const unsigned char *) msg, strlen(msg),
                           hash) == 0);

    mbedtls_ecp_set_max_ops(max_ops);

    slen = sizeof(sig);
    cnt_restart = 0;
    do {
        ret = mbedtls_pk_sign_restartable(&prv, md_alg, hash, hlen,
                                          sig, &slen, NULL, NULL, &rs_ctx);
    } while (ret == MBEDTLS_ERR_ECP_IN_PROGRESS && ++cnt_restart);

    TEST_ASSERT(ret == 0);
    TEST_ASSERT(slen == sig_check->len);
    TEST_ASSERT(memcmp(sig, sig_check->x, slen) == 0);

    TEST_ASSERT(cnt_restart >= min_restart);
    TEST_ASSERT(cnt_restart <= max_restart);

    cnt_restart = 0;
    do {
        ret = mbedtls_pk_verify_restartable(&pub, md_alg,
                                            hash, hlen, sig, slen, &rs_ctx);
    } while (ret == MBEDTLS_ERR_ECP_IN_PROGRESS && ++cnt_restart);

    TEST_ASSERT(ret == 0);
    TEST_ASSERT(cnt_restart >= min_restart);
    TEST_ASSERT(cnt_restart <= max_restart);

    hash[0]++;
    do {
        ret = mbedtls_pk_verify_restartable(&pub, md_alg,
                                            hash, hlen, sig, slen, &rs_ctx);
    } while (ret == MBEDTLS_ERR_ECP_IN_PROGRESS);
    TEST_ASSERT(ret != 0);
    hash[0]--;

    sig[0]++;
    do {
        ret = mbedtls_pk_verify_restartable(&pub, md_alg,
                                            hash, hlen, sig, slen, &rs_ctx);
    } while (ret == MBEDTLS_ERR_ECP_IN_PROGRESS);
    TEST_ASSERT(ret != 0);
    sig[0]--;

    /* Do we leak memory when aborting? try verify then sign
     * This test only makes sense when we actually restart */
    if (min_restart > 0) {
        ret = mbedtls_pk_verify_restartable(&pub, md_alg,
                                            hash, hlen, sig, slen, &rs_ctx);
        TEST_ASSERT(ret == MBEDTLS_ERR_ECP_IN_PROGRESS);
        mbedtls_pk_restart_free(&rs_ctx);

        slen = sizeof(sig);
        ret = mbedtls_pk_sign_restartable(&prv, md_alg, hash, hlen,
                                          sig, &slen, NULL, NULL, &rs_ctx);
        TEST_ASSERT(ret == MBEDTLS_ERR_ECP_IN_PROGRESS);
    }

exit:
    mbedtls_pk_restart_free(&rs_ctx);
    mbedtls_pk_free(&prv);
    mbedtls_pk_free(&pub);
}
/* END_CASE */

/* BEGIN_CASE depends_on:MBEDTLS_SHA256_C */
void pk_sign_verify(int type, int parameter, int sign_ret, int verify_ret)
{
    mbedtls_pk_context pk;
    size_t sig_len, hash_len;
    mbedtls_md_type_t md = MBEDTLS_MD_SHA256;
    unsigned char *hash = NULL;
    unsigned char sig[MBEDTLS_PK_SIGNATURE_MAX_SIZE];
    void *rs_ctx = NULL;
#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
    mbedtls_pk_restart_ctx ctx;

    rs_ctx = &ctx;
    mbedtls_pk_restart_init(rs_ctx);
    /* This value is large enough that the operation will complete in one run.
     * See comments at the top of ecp_test_vect_restart in
     * test_suite_ecp.function for estimates of operation counts. */
    mbedtls_ecp_set_max_ops(42000);
#endif

    hash_len = mbedtls_md_get_size(mbedtls_md_info_from_type(md));
    ASSERT_ALLOC(hash, hash_len);

    mbedtls_pk_init(&pk);
    USE_PSA_INIT();

    memset(hash, 0x2a, hash_len);
    memset(sig, 0, sizeof(sig));

    TEST_ASSERT(mbedtls_pk_setup(&pk, mbedtls_pk_info_from_type(type)) == 0);
    TEST_ASSERT(pk_genkey(&pk, parameter) == 0);

    TEST_ASSERT(mbedtls_pk_sign_restartable(&pk, md,
                                            hash, hash_len, sig, &sig_len,
                                            mbedtls_test_rnd_std_rand, NULL, rs_ctx) == sign_ret);
    if (sign_ret == 0) {
        TEST_ASSERT(sig_len <= MBEDTLS_PK_SIGNATURE_MAX_SIZE);
    } else {
        sig_len = MBEDTLS_PK_SIGNATURE_MAX_SIZE;
    }

    TEST_ASSERT(mbedtls_pk_verify(&pk, md,
                                  hash, hash_len, sig, sig_len) == verify_ret);

    if (verify_ret == 0) {
        hash[0]++;
        TEST_ASSERT(mbedtls_pk_verify(&pk, md,
                                      hash, hash_len, sig, sig_len) != 0);
        hash[0]--;

        sig[0]++;
        TEST_ASSERT(mbedtls_pk_verify(&pk, md,
                                      hash, hash_len, sig, sig_len) != 0);
        sig[0]--;
    }

    TEST_ASSERT(mbedtls_pk_sign(&pk, md, hash, hash_len,
                                sig, &sig_len,
                                mbedtls_test_rnd_std_rand,
                                NULL) == sign_ret);
    if (sign_ret == 0) {
        TEST_ASSERT(sig_len <= MBEDTLS_PK_SIGNATURE_MAX_SIZE);
    } else {
        sig_len = MBEDTLS_PK_SIGNATURE_MAX_SIZE;
    }

    TEST_ASSERT(mbedtls_pk_verify_restartable(&pk, md,
                                              hash, hash_len, sig, sig_len, rs_ctx) == verify_ret);

    if (verify_ret == 0) {
        hash[0]++;
        TEST_ASSERT(mbedtls_pk_verify_restartable(&pk, md,
                                                  hash, hash_len, sig, sig_len, rs_ctx) != 0);
        hash[0]--;

        sig[0]++;
        TEST_ASSERT(mbedtls_pk_verify_restartable(&pk, md,
                                                  hash, hash_len, sig, sig_len, rs_ctx) != 0);
        sig[0]--;
    }

exit:
#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
    mbedtls_pk_restart_free(rs_ctx);
#endif
    mbedtls_pk_free(&pk);
    mbedtls_free(hash);
    USE_PSA_DONE();
}
/* END_CASE */

/* BEGIN_CASE depends_on:MBEDTLS_RSA_C */
void pk_rsa_encrypt_test_vec(data_t *message, int mod,
                             char *input_N, char *input_E,
                             data_t *result, int ret)
{
    unsigned char output[300];
    mbedtls_test_rnd_pseudo_info rnd_info;
    mbedtls_rsa_context *rsa;
    mbedtls_pk_context pk;
    size_t olen;

    memset(&rnd_info,  0, sizeof(mbedtls_test_rnd_pseudo_info));
    memset(output,     0, sizeof(output));


    mbedtls_pk_init(&pk);
    TEST_ASSERT(mbedtls_pk_setup(&pk, mbedtls_pk_info_from_type(MBEDTLS_PK_RSA)) == 0);
    rsa = mbedtls_pk_rsa(pk);

    rsa->len = mod / 8;
    TEST_ASSERT(mbedtls_test_read_mpi(&rsa->N, input_N) == 0);
    TEST_ASSERT(mbedtls_test_read_mpi(&rsa->E, input_E) == 0);

    TEST_ASSERT(mbedtls_pk_encrypt(&pk, message->x, message->len,
                                   output, &olen, sizeof(output),
                                   mbedtls_test_rnd_pseudo_rand, &rnd_info) == ret);
    TEST_ASSERT(olen == result->len);
    TEST_ASSERT(memcmp(output, result->x, olen) == 0);

exit:
    mbedtls_pk_free(&pk);
}
/* END_CASE */

/* BEGIN_CASE depends_on:MBEDTLS_RSA_C */
void pk_rsa_decrypt_test_vec(data_t *cipher, int mod,
                             char *input_P, char *input_Q,
                             char *input_N, char *input_E,
                             data_t *clear, int ret)
{
    unsigned char output[256];
    mbedtls_test_rnd_pseudo_info rnd_info;
    mbedtls_mpi N, P, Q, E;
    mbedtls_rsa_context *rsa;
    mbedtls_pk_context pk;
    size_t olen;

    mbedtls_pk_init(&pk);
    mbedtls_mpi_init(&N); mbedtls_mpi_init(&P);
    mbedtls_mpi_init(&Q); mbedtls_mpi_init(&E);

    memset(&rnd_info,  0, sizeof(mbedtls_test_rnd_pseudo_info));


    /* init pk-rsa context */
    TEST_ASSERT(mbedtls_pk_setup(&pk, mbedtls_pk_info_from_type(MBEDTLS_PK_RSA)) == 0);
    rsa = mbedtls_pk_rsa(pk);

    /* load public key */
    TEST_ASSERT(mbedtls_test_read_mpi(&N, input_N) == 0);
    TEST_ASSERT(mbedtls_test_read_mpi(&E, input_E) == 0);

    /* load private key */
    TEST_ASSERT(mbedtls_test_read_mpi(&P, input_P) == 0);
    TEST_ASSERT(mbedtls_test_read_mpi(&Q, input_Q) == 0);
    TEST_ASSERT(mbedtls_rsa_import(rsa, &N, &P, &Q, NULL, &E) == 0);
    TEST_ASSERT(mbedtls_rsa_get_len(rsa) == (size_t) (mod / 8));
    TEST_ASSERT(mbedtls_rsa_complete(rsa) == 0);

    /* decryption test */
    memset(output, 0, sizeof(output));
    olen = 0;
    TEST_ASSERT(mbedtls_pk_decrypt(&pk, cipher->x, cipher->len,
                                   output, &olen, sizeof(output),
                                   mbedtls_test_rnd_pseudo_rand, &rnd_info) == ret);
    if (ret == 0) {
        TEST_ASSERT(olen == clear->len);
        TEST_ASSERT(memcmp(output, clear->x, olen) == 0);
    }

exit:
    mbedtls_mpi_free(&N); mbedtls_mpi_free(&P);
    mbedtls_mpi_free(&Q); mbedtls_mpi_free(&E);
    mbedtls_pk_free(&pk);
}
/* END_CASE */

/* BEGIN_CASE */
void pk_ec_nocrypt(int type)
{
    mbedtls_pk_context pk;
    unsigned char output[100];
    unsigned char input[100];
    mbedtls_test_rnd_pseudo_info rnd_info;
    size_t olen = 0;
    int ret = MBEDTLS_ERR_PK_TYPE_MISMATCH;

    mbedtls_pk_init(&pk);

    memset(&rnd_info,  0, sizeof(mbedtls_test_rnd_pseudo_info));
    memset(output,     0, sizeof(output));
    memset(input,      0, sizeof(input));

    TEST_ASSERT(mbedtls_pk_setup(&pk, mbedtls_pk_info_from_type(type)) == 0);

    TEST_ASSERT(mbedtls_pk_encrypt(&pk, input, sizeof(input),
                                   output, &olen, sizeof(output),
                                   mbedtls_test_rnd_pseudo_rand, &rnd_info) == ret);

    TEST_ASSERT(mbedtls_pk_decrypt(&pk, input, sizeof(input),
                                   output, &olen, sizeof(output),
                                   mbedtls_test_rnd_pseudo_rand, &rnd_info) == ret);

exit:
    mbedtls_pk_free(&pk);
}
/* END_CASE */

/* BEGIN_CASE depends_on:MBEDTLS_RSA_C */
void pk_rsa_overflow()
{
    mbedtls_pk_context pk;
    size_t hash_len = SIZE_MAX, sig_len = SIZE_MAX;
    unsigned char hash[50], sig[100];

    if (SIZE_MAX <= UINT_MAX) {
        return;
    }

    memset(hash, 0x2a, sizeof(hash));
    memset(sig, 0, sizeof(sig));

    mbedtls_pk_init(&pk);

    TEST_ASSERT(mbedtls_pk_setup(&pk,
                                 mbedtls_pk_info_from_type(MBEDTLS_PK_RSA)) == 0);

#if defined(MBEDTLS_PKCS1_V21)
    TEST_ASSERT(mbedtls_pk_verify_ext(MBEDTLS_PK_RSASSA_PSS, NULL, &pk,
                                      MBEDTLS_MD_NONE, hash, hash_len, sig, sig_len) ==
                MBEDTLS_ERR_PK_BAD_INPUT_DATA);
#endif /* MBEDTLS_PKCS1_V21 */

    TEST_ASSERT(mbedtls_pk_verify(&pk, MBEDTLS_MD_NONE, hash, hash_len,
                                  sig, sig_len) == MBEDTLS_ERR_PK_BAD_INPUT_DATA);

    TEST_ASSERT(mbedtls_pk_sign(&pk, MBEDTLS_MD_NONE, hash, hash_len, sig,
                                &sig_len, mbedtls_test_rnd_std_rand, NULL)
                == MBEDTLS_ERR_PK_BAD_INPUT_DATA);

exit:
    mbedtls_pk_free(&pk);
}
/* END_CASE */

/* BEGIN_CASE depends_on:MBEDTLS_RSA_C:MBEDTLS_PK_RSA_ALT_SUPPORT */
void pk_rsa_alt()
{
    /*
     * An rsa_alt context can only do private operations (decrypt, sign).
     * Test it against the public operations (encrypt, verify) of a
     * corresponding rsa context.
     */
    mbedtls_rsa_context raw;
    mbedtls_pk_context rsa, alt;
    mbedtls_pk_debug_item dbg_items[10];
    unsigned char hash[50], sig[64];
    unsigned char msg[50], ciph[64], test[50];
    size_t sig_len, ciph_len, test_len;
    int ret = MBEDTLS_ERR_PK_TYPE_MISMATCH;

    mbedtls_rsa_init(&raw, MBEDTLS_RSA_PKCS_V15, MBEDTLS_MD_NONE);
    mbedtls_pk_init(&rsa); mbedtls_pk_init(&alt);

    memset(hash, 0x2a, sizeof(hash));
    memset(sig, 0, sizeof(sig));
    memset(msg, 0x2a, sizeof(msg));
    memset(ciph, 0, sizeof(ciph));
    memset(test, 0, sizeof(test));

    /* Initialize PK RSA context with random key */
    TEST_ASSERT(mbedtls_pk_setup(&rsa,
                                 mbedtls_pk_info_from_type(MBEDTLS_PK_RSA)) == 0);
    TEST_ASSERT(pk_genkey(&rsa, RSA_KEY_SIZE) == 0);

    /* Extract key to the raw rsa context */
    TEST_ASSERT(mbedtls_rsa_copy(&raw, mbedtls_pk_rsa(rsa)) == 0);

    /* Initialize PK RSA_ALT context */
    TEST_ASSERT(mbedtls_pk_setup_rsa_alt(&alt, (void *) &raw,
                                         mbedtls_rsa_decrypt_func, mbedtls_rsa_sign_func,
                                         mbedtls_rsa_key_len_func) == 0);

    /* Test administrative functions */
    TEST_ASSERT(mbedtls_pk_can_do(&alt, MBEDTLS_PK_RSA));
    TEST_ASSERT(mbedtls_pk_get_bitlen(&alt) == RSA_KEY_SIZE);
    TEST_ASSERT(mbedtls_pk_get_len(&alt) == RSA_KEY_LEN);
    TEST_ASSERT(mbedtls_pk_get_type(&alt) == MBEDTLS_PK_RSA_ALT);
    TEST_ASSERT(strcmp(mbedtls_pk_get_name(&alt), "RSA-alt") == 0);

    /* Test signature */
#if SIZE_MAX > UINT_MAX
    TEST_ASSERT(mbedtls_pk_sign(&alt, MBEDTLS_MD_NONE, hash, SIZE_MAX, sig,
                                &sig_len, mbedtls_test_rnd_std_rand, NULL)
                == MBEDTLS_ERR_PK_BAD_INPUT_DATA);
#endif /* SIZE_MAX > UINT_MAX */
    TEST_ASSERT(mbedtls_pk_sign(&alt, MBEDTLS_MD_NONE, hash, sizeof(hash), sig,
                                &sig_len, mbedtls_test_rnd_std_rand, NULL)
                == 0);
    TEST_ASSERT(sig_len == RSA_KEY_LEN);
    TEST_ASSERT(mbedtls_pk_verify(&rsa, MBEDTLS_MD_NONE,
                                  hash, sizeof(hash), sig, sig_len) == 0);

    /* Test decrypt */
    TEST_ASSERT(mbedtls_pk_encrypt(&rsa, msg, sizeof(msg),
                                   ciph, &ciph_len, sizeof(ciph),
                                   mbedtls_test_rnd_std_rand, NULL) == 0);
    TEST_ASSERT(mbedtls_pk_decrypt(&alt, ciph, ciph_len,
                                   test, &test_len, sizeof(test),
                                   mbedtls_test_rnd_std_rand, NULL) == 0);
    TEST_ASSERT(test_len == sizeof(msg));
    TEST_ASSERT(memcmp(test, msg, test_len) == 0);

    /* Test forbidden operations */
    TEST_ASSERT(mbedtls_pk_encrypt(&alt, msg, sizeof(msg),
                                   ciph, &ciph_len, sizeof(ciph),
                                   mbedtls_test_rnd_std_rand, NULL) == ret);
    TEST_ASSERT(mbedtls_pk_verify(&alt, MBEDTLS_MD_NONE,
                                  hash, sizeof(hash), sig, sig_len) == ret);
    TEST_ASSERT(mbedtls_pk_debug(&alt, dbg_items) == ret);

exit:
    mbedtls_rsa_free(&raw);
    mbedtls_pk_free(&rsa); mbedtls_pk_free(&alt);
}
/* END_CASE */

/* BEGIN_CASE depends_on:MBEDTLS_SHA256_C:MBEDTLS_USE_PSA_CRYPTO:MBEDTLS_ECDSA_C */
void pk_psa_sign(int grpid_arg,
                 int psa_curve_arg, int expected_bits_arg)
{
    mbedtls_ecp_group_id grpid = grpid_arg;
    mbedtls_pk_context pk;
    unsigned char hash[32];
    unsigned char sig[MBEDTLS_ECDSA_MAX_LEN];
    unsigned char pkey_legacy[200];
    unsigned char pkey_psa[200];
    unsigned char *pkey_legacy_start, *pkey_psa_start;
    size_t sig_len, klen_legacy, klen_psa;
    int ret;
    mbedtls_svc_key_id_t key_id;
    psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
    psa_key_type_t expected_type = PSA_KEY_TYPE_ECC_KEY_PAIR(psa_curve_arg);
    size_t expected_bits = expected_bits_arg;

    /*
     * This tests making signatures with a wrapped PSA key:
     * - generate a fresh ECP legacy PK context
     * - wrap it in a PK context and make a signature this way
     * - extract the public key
     * - parse it to a PK context and verify the signature this way
     */

    PSA_ASSERT(psa_crypto_init());

    /* Create legacy EC public/private key in PK context. */
    mbedtls_pk_init(&pk);
    TEST_ASSERT(mbedtls_pk_setup(&pk,
                                 mbedtls_pk_info_from_type(MBEDTLS_PK_ECKEY)) == 0);
    TEST_ASSERT(mbedtls_ecp_gen_key(grpid,
                                    (mbedtls_ecp_keypair *) pk.pk_ctx,
                                    mbedtls_test_rnd_std_rand, NULL) == 0);

    /* Export underlying public key for re-importing in a legacy context. */
    ret = mbedtls_pk_write_pubkey_der(&pk, pkey_legacy,
                                      sizeof(pkey_legacy));
    TEST_ASSERT(ret >= 0);
    klen_legacy = (size_t) ret;
    /* mbedtls_pk_write_pubkey_der() writes backwards in the data buffer. */
    pkey_legacy_start = pkey_legacy + sizeof(pkey_legacy) - klen_legacy;

    /* Turn PK context into an opaque one. */
    TEST_ASSERT(mbedtls_pk_wrap_as_opaque(&pk, &key_id,
                                          PSA_ALG_SHA_256) == 0);

    PSA_ASSERT(psa_get_key_attributes(key_id, &attributes));
    TEST_EQUAL(psa_get_key_type(&attributes), expected_type);
    TEST_EQUAL(psa_get_key_bits(&attributes), expected_bits);
    TEST_EQUAL(psa_get_key_lifetime(&attributes),
               PSA_KEY_LIFETIME_VOLATILE);

    memset(hash, 0x2a, sizeof(hash));
    memset(sig, 0, sizeof(sig));

    TEST_ASSERT(mbedtls_pk_sign(&pk, MBEDTLS_MD_SHA256,
                                hash, sizeof(hash), sig, &sig_len,
                                NULL, NULL) == 0);

    /* Export underlying public key for re-importing in a psa context. */
    ret = mbedtls_pk_write_pubkey_der(&pk, pkey_psa,
                                      sizeof(pkey_psa));
    TEST_ASSERT(ret >= 0);
    klen_psa = (size_t) ret;
    /* mbedtls_pk_write_pubkey_der() writes backwards in the data buffer. */
    pkey_psa_start = pkey_psa + sizeof(pkey_psa) - klen_psa;

    TEST_ASSERT(klen_psa == klen_legacy);
    TEST_ASSERT(memcmp(pkey_psa_start, pkey_legacy_start, klen_psa) == 0);

    mbedtls_pk_free(&pk);
    TEST_ASSERT(PSA_SUCCESS == psa_destroy_key(key_id));

    mbedtls_pk_init(&pk);
    TEST_ASSERT(mbedtls_pk_parse_public_key(&pk, pkey_legacy_start,
                                            klen_legacy) == 0);
    TEST_ASSERT(mbedtls_pk_verify(&pk, MBEDTLS_MD_SHA256,
                                  hash, sizeof(hash), sig, sig_len) == 0);

exit:
    /*
     * Key attributes may have been returned by psa_get_key_attributes()
     * thus reset them as required.
     */
    psa_reset_key_attributes(&attributes);

    mbedtls_pk_free(&pk);
    USE_PSA_DONE();
}
/* END_CASE */