1 files changed, 128 insertions, 0 deletions
diff --git a/programs/pkey/pk_verify.c b/programs/pkey/pk_verify.c
new file mode 100644
index 00000000000..3127df54007
--- /dev/null
+++ b/programs/pkey/pk_verify.c
@@ -0,0 +1,128 @@
+/*
+ *  Public key-based signature verification program
+ *
+ *  Copyright The Mbed TLS Contributors
+ *  SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
+ */
+
+#include "mbedtls/build_info.h"
+
+#include "mbedtls/platform.h"
+/* md.h is included this early since MD_CAN_XXX macros are defined there. */
+#include "mbedtls/md.h"
+
+#if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_MD_C) || \
+    !defined(MBEDTLS_MD_CAN_SHA256) || !defined(MBEDTLS_PK_PARSE_C) ||   \
+    !defined(MBEDTLS_FS_IO)
+int main(void)
+{
+    mbedtls_printf("MBEDTLS_BIGNUM_C and/or MBEDTLS_MD_C and/or "
+                   "MBEDTLS_MD_CAN_SHA256 and/or MBEDTLS_PK_PARSE_C and/or "
+                   "MBEDTLS_FS_IO not defined.\n");
+    mbedtls_exit(0);
+}
+#else
+
+#include "mbedtls/error.h"
+#include "mbedtls/pk.h"
+
+#include <stdio.h>
+#include <string.h>
+
+
+int main(int argc, char *argv[])
+{
+    FILE *f;
+    int ret = 1;
+    int exit_code = MBEDTLS_EXIT_FAILURE;
+    size_t i;
+    mbedtls_pk_context pk;
+    unsigned char hash[32];
+    unsigned char buf[MBEDTLS_PK_SIGNATURE_MAX_SIZE];
+    char filename[512];
+
+    mbedtls_pk_init(&pk);
+
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+    psa_status_t status = psa_crypto_init();
+    if (status != PSA_SUCCESS) {
+        mbedtls_fprintf(stderr, "Failed to initialize PSA Crypto implementation: %d\n",
+                        (int) status);
+        goto exit;
+    }
+#endif /* MBEDTLS_USE_PSA_CRYPTO */
+
+    if (argc != 3) {
+        mbedtls_printf("usage: mbedtls_pk_verify <key_file> <filename>\n");
+
+#if defined(_WIN32)
+        mbedtls_printf("\n");
+#endif
+
+        goto exit;
+    }
+
+    mbedtls_printf("\n  . Reading public key from '%s'", argv[1]);
+    fflush(stdout);
+
+    if ((ret = mbedtls_pk_parse_public_keyfile(&pk, argv[1])) != 0) {
+        mbedtls_printf(" failed\n  ! mbedtls_pk_parse_public_keyfile returned -0x%04x\n",
+                       (unsigned int) -ret);
+        goto exit;
+    }
+
+    /*
+     * Extract the signature from the file
+     */
+    mbedtls_snprintf(filename, sizeof(filename), "%s.sig", argv[2]);
+
+    if ((f = fopen(filename, "rb")) == NULL) {
+        mbedtls_printf("\n  ! Could not open %s\n\n", filename);
+        goto exit;
+    }
+
+    i = fread(buf, 1, sizeof(buf), f);
+
+    fclose(f);
+
+    /*
+     * Compute the SHA-256 hash of the input file and
+     * verify the signature
+     */
+    mbedtls_printf("\n  . Verifying the SHA-256 signature");
+    fflush(stdout);
+
+    if ((ret = mbedtls_md_file(
+             mbedtls_md_info_from_type(MBEDTLS_MD_SHA256),
+             argv[2], hash)) != 0) {
+        mbedtls_printf(" failed\n  ! Could not open or read %s\n\n", argv[2]);
+        goto exit;
+    }
+
+    if ((ret = mbedtls_pk_verify(&pk, MBEDTLS_MD_SHA256, hash, 0,
+                                 buf, i)) != 0) {
+        mbedtls_printf(" failed\n  ! mbedtls_pk_verify returned -0x%04x\n", (unsigned int) -ret);
+        goto exit;
+    }
+
+    mbedtls_printf("\n  . OK (the signature is valid)\n\n");
+
+    exit_code = MBEDTLS_EXIT_SUCCESS;
+
+exit:
+    mbedtls_pk_free(&pk);
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+    mbedtls_psa_crypto_free();
+#endif /* MBEDTLS_USE_PSA_CRYPTO */
+
+#if defined(MBEDTLS_ERROR_C)
+    if (exit_code != MBEDTLS_EXIT_SUCCESS) {
+        mbedtls_strerror(ret, (char *) buf, sizeof(buf));
+        mbedtls_printf("  !  Last error was: %s\n", buf);
+    }
+#endif
+
+    mbedtls_exit(exit_code);
+}
+#endif /* MBEDTLS_BIGNUM_C && MBEDTLS_MD_CAN_SHA256 &&
+          MBEDTLS_PK_PARSE_C && MBEDTLS_FS_IO */