psa: Move ECDSA sign/verify to PSA ECP specific file
Signed-off-by: Ronald Cron <ronald.cron@arm.com>
diff --git a/library/psa_crypto_ecp.c b/library/psa_crypto_ecp.c
index 23ec6ac..bd40f2e 100644
--- a/library/psa_crypto_ecp.c
+++ b/library/psa_crypto_ecp.c
@@ -35,6 +35,7 @@
#define mbedtls_free free
#endif
+#include <mbedtls/ecdsa.h>
#include <mbedtls/ecp.h>
#include <mbedtls/error.h>
@@ -337,6 +338,145 @@
}
#endif /* defined(BUILTIN_KEY_TYPE_ECC_KEY_PAIR) */
+/****************************************************************/
+/* ECDSA sign/verify */
+/****************************************************************/
+
+#if defined(MBEDTLS_PSA_BUILTIN_ALG_ECDSA) || \
+ defined(MBEDTLS_PSA_BUILTIN_ALG_DETERMINISTIC_ECDSA)
+psa_status_t mbedtls_psa_ecdsa_sign_hash(
+ const psa_key_attributes_t *attributes,
+ const uint8_t *key_buffer, size_t key_buffer_size,
+ psa_algorithm_t alg, const uint8_t *hash, size_t hash_length,
+ uint8_t *signature, size_t signature_size, size_t *signature_length )
+{
+ psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
+ mbedtls_ecp_keypair *ecp = NULL;
+ int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
+ size_t curve_bytes;
+ mbedtls_mpi r, s;
+
+ status = mbedtls_psa_ecp_load_representation( attributes->core.type,
+ attributes->core.bits,
+ key_buffer,
+ key_buffer_size,
+ &ecp );
+ if( status != PSA_SUCCESS )
+ return( status );
+
+ curve_bytes = PSA_BITS_TO_BYTES( ecp->grp.pbits );
+ mbedtls_mpi_init( &r );
+ mbedtls_mpi_init( &s );
+
+ if( signature_size < 2 * curve_bytes )
+ {
+ ret = MBEDTLS_ERR_ECP_BUFFER_TOO_SMALL;
+ goto cleanup;
+ }
+
+#if defined(MBEDTLS_PSA_BUILTIN_ALG_DETERMINISTIC_ECDSA)
+ if( PSA_ALG_DSA_IS_DETERMINISTIC( alg ) )
+ {
+ psa_algorithm_t hash_alg = PSA_ALG_SIGN_GET_HASH( alg );
+ const mbedtls_md_info_t *md_info = mbedtls_md_info_from_psa( hash_alg );
+ mbedtls_md_type_t md_alg = mbedtls_md_get_type( md_info );
+ MBEDTLS_MPI_CHK( mbedtls_ecdsa_sign_det_ext(
+ &ecp->grp, &r, &s,
+ &ecp->d, hash,
+ hash_length, md_alg,
+ mbedtls_psa_get_random,
+ MBEDTLS_PSA_RANDOM_STATE ) );
+ }
+ else
+#endif /* defined(MBEDTLS_PSA_BUILTIN_ALG_DETERMINISTIC_ECDSA) */
+ {
+ (void) alg;
+ MBEDTLS_MPI_CHK( mbedtls_ecdsa_sign( &ecp->grp, &r, &s, &ecp->d,
+ hash, hash_length,
+ mbedtls_psa_get_random,
+ MBEDTLS_PSA_RANDOM_STATE ) );
+ }
+
+ MBEDTLS_MPI_CHK( mbedtls_mpi_write_binary( &r,
+ signature,
+ curve_bytes ) );
+ MBEDTLS_MPI_CHK( mbedtls_mpi_write_binary( &s,
+ signature + curve_bytes,
+ curve_bytes ) );
+cleanup:
+ mbedtls_mpi_free( &r );
+ mbedtls_mpi_free( &s );
+ if( ret == 0 )
+ *signature_length = 2 * curve_bytes;
+
+ mbedtls_ecp_keypair_free( ecp );
+ mbedtls_free( ecp );
+
+ return( mbedtls_to_psa_error( ret ) );
+}
+
+psa_status_t mbedtls_psa_ecdsa_verify_hash(
+ const psa_key_attributes_t *attributes,
+ const uint8_t *key_buffer, size_t key_buffer_size,
+ psa_algorithm_t alg, const uint8_t *hash, size_t hash_length,
+ const uint8_t *signature, size_t signature_length )
+{
+ psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
+ mbedtls_ecp_keypair *ecp = NULL;
+ int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
+ size_t curve_bytes;
+ mbedtls_mpi r, s;
+
+ (void)alg;
+
+ status = mbedtls_psa_ecp_load_representation( attributes->core.type,
+ attributes->core.bits,
+ key_buffer,
+ key_buffer_size,
+ &ecp );
+ if( status != PSA_SUCCESS )
+ return( status );
+
+ curve_bytes = PSA_BITS_TO_BYTES( ecp->grp.pbits );
+ mbedtls_mpi_init( &r );
+ mbedtls_mpi_init( &s );
+
+ if( signature_length != 2 * curve_bytes )
+ {
+ ret = MBEDTLS_ERR_ECP_VERIFY_FAILED;
+ goto cleanup;
+ }
+
+ MBEDTLS_MPI_CHK( mbedtls_mpi_read_binary( &r,
+ signature,
+ curve_bytes ) );
+ MBEDTLS_MPI_CHK( mbedtls_mpi_read_binary( &s,
+ signature + curve_bytes,
+ curve_bytes ) );
+
+ /* Check whether the public part is loaded. If not, load it. */
+ if( mbedtls_ecp_is_zero( &ecp->Q ) )
+ {
+ MBEDTLS_MPI_CHK(
+ mbedtls_ecp_mul( &ecp->grp, &ecp->Q, &ecp->d, &ecp->grp.G,
+ mbedtls_psa_get_random, MBEDTLS_PSA_RANDOM_STATE ) );
+ }
+
+ ret = mbedtls_ecdsa_verify( &ecp->grp, hash, hash_length,
+ &ecp->Q, &r, &s );
+
+cleanup:
+ mbedtls_mpi_free( &r );
+ mbedtls_mpi_free( &s );
+ mbedtls_ecp_keypair_free( ecp );
+ mbedtls_free( ecp );
+
+ return( mbedtls_to_psa_error( ret ) );
+}
+
+#endif /* defined(MBEDTLS_PSA_BUILTIN_ALG_ECDSA) || \
+ * defined(MBEDTLS_PSA_BUILTIN_ALG_DETERMINISTIC_ECDSA) */
+
#if defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_ECC_KEY_PAIR) || \
defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_ECC_PUBLIC_KEY)