psasim: add AUT for PSA sign and verify

Signed-off-by: Valerio Setti <valerio.setti@nordicsemi.no>
diff --git a/tests/psa-client-server/psasim/src/aut_main.c b/tests/psa-client-server/psasim/src/aut_main.c
index 9604964..3eee631 100644
--- a/tests/psa-client-server/psasim/src/aut_main.c
+++ b/tests/psa-client-server/psasim/src/aut_main.c
@@ -25,6 +25,7 @@
 int psa_random_main(void);
 int psa_mac_main(void);
 int psa_key_agreement_main(void);
+int psa_sign_verify_main(void);
 
 #define TEST_MODULE(main_func) \
     do {    \
@@ -55,6 +56,7 @@
 
     TEST_MODULE(psa_mac_main());
     TEST_MODULE(psa_key_agreement_main());
+    TEST_MODULE(psa_sign_verify_main());
 
 exit:
     return (ret != 0) ? 1 : 0;
diff --git a/tests/psa-client-server/psasim/src/aut_psa_sign_verify.c b/tests/psa-client-server/psasim/src/aut_psa_sign_verify.c
new file mode 100644
index 0000000..98df9e5
--- /dev/null
+++ b/tests/psa-client-server/psasim/src/aut_psa_sign_verify.c
@@ -0,0 +1,93 @@
+/*
+ *  Copyright The Mbed TLS Contributors
+ *  SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
+ */
+
+
+#include "psa/crypto.h"
+#include <string.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "mbedtls/build_info.h"
+#include "mbedtls/platform.h"
+
+#define KEY_BYTES_VALUE {                                                       \
+        0x49, 0xc9, 0xa8, 0xc1, 0x8c, 0x4b, 0x88, 0x56, 0x38, 0xc4, 0x31, 0xcf, \
+        0x1d, 0xf1, 0xc9, 0x94, 0x13, 0x16, 0x09, 0xb5, 0x80, 0xd4, 0xfd, 0x43, \
+        0xa0, 0xca, 0xb1, 0x7d, 0xb2, 0xf1, 0x3e, 0xee                          \
+}
+
+#define PLAINTEXT_VALUE "Hello World!"
+
+/* SHA-256(plaintext) */
+#define HASH_VALUE {                                                            \
+        0x5a, 0x09, 0xe8, 0xfa, 0x9c, 0x77, 0x80, 0x7b, 0x24, 0xe9, 0x9c, 0x9c, \
+        0xf9, 0x99, 0xde, 0xbf, 0xad, 0x84, 0x41, 0xe2, 0x69, 0xeb, 0x96, 0x0e, \
+        0x20, 0x1f, 0x61, 0xfc, 0x3d, 0xe2, 0x0d, 0x5a                          \
+}
+
+int psa_sign_verify_main(void)
+{
+    psa_status_t status;
+    psa_key_id_t key_id = 0;
+    psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
+    uint8_t signature[PSA_SIGNATURE_MAX_SIZE] = { 0 };
+    size_t signature_length;
+    const uint8_t key_bytes[] = KEY_BYTES_VALUE;
+    const uint8_t plaintext[] = PLAINTEXT_VALUE;
+    const uint8_t hash[] = HASH_VALUE;
+
+    status = psa_crypto_init();
+    if (status != PSA_SUCCESS) {
+        mbedtls_printf("psa_crypto_init failed\n");
+        return EXIT_FAILURE;
+    }
+
+    psa_set_key_usage_flags(&attributes,
+                            PSA_KEY_USAGE_SIGN_HASH | PSA_KEY_USAGE_VERIFY_HASH);
+    psa_set_key_algorithm(&attributes, PSA_ALG_ECDSA(PSA_ALG_SHA_256));
+    psa_set_key_type(&attributes, PSA_KEY_TYPE_ECC_KEY_PAIR(PSA_ECC_FAMILY_SECP_R1));
+
+    status = psa_import_key(&attributes, key_bytes, sizeof(key_bytes), &key_id);
+    if (status != PSA_SUCCESS) {
+        mbedtls_printf("psa_import_key failed\n");
+        return EXIT_FAILURE;
+    }
+
+    status = psa_sign_hash(key_id,                          // key handle
+                           PSA_ALG_ECDSA(PSA_ALG_SHA_256),  // signature algorithm
+                           hash, sizeof(hash),              // hash of the message
+                           signature, sizeof(signature),    // signature (as output)
+                           &signature_length);              // length of signature output
+    if (status != PSA_SUCCESS) {
+        mbedtls_printf("psa_sign_hash failed\n");
+        return EXIT_FAILURE;
+    }
+
+    mbedtls_printf("ECDSA-SHA256 signature of SHA-256('%s'):\n", plaintext);
+
+    for (size_t j = 0; j < signature_length; j++) {
+        if (j % 8 == 0) {
+            mbedtls_printf("\n    ");
+        }
+        mbedtls_printf("%02x ", signature[j]);
+    }
+
+    mbedtls_printf("\n");
+
+    status = psa_verify_hash(key_id,                          // key handle
+                             PSA_ALG_ECDSA(PSA_ALG_SHA_256),  // signature algorithm
+                             hash, sizeof(hash),              // hash of message
+                             signature, signature_length);    // signature
+    if (status != PSA_SUCCESS) {
+        mbedtls_printf("psa_verify_hash failed\n");
+        return EXIT_FAILURE;
+    } else {
+        mbedtls_printf("\nSignature verification successful!\n");
+    }
+
+    psa_destroy_key(key_id);
+    mbedtls_psa_crypto_free();
+    return EXIT_SUCCESS;
+}