quickjs-tart

quickjs-based runtime for wallet-core logic
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rsa_verify.c (3538B)

      1 /*
      2  *  RSA/SHA-256 signature verification program
      3  *
      4  *  Copyright The Mbed TLS Contributors
      5  *  SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
      6  */
      7 
      8 #include "mbedtls/build_info.h"
      9 
     10 #include "mbedtls/platform.h"
     11 /* md.h is included this early since MD_CAN_XXX macros are defined there. */
     12 #include "mbedtls/md.h"
     13 
     14 #if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_RSA_C) ||  \
     15     !defined(MBEDTLS_MD_CAN_SHA256) || !defined(MBEDTLS_MD_C) || \
     16     !defined(MBEDTLS_FS_IO)
     17 int main(void)
     18 {
     19     mbedtls_printf("MBEDTLS_BIGNUM_C and/or MBEDTLS_RSA_C and/or "
     20                    "MBEDTLS_MD_C and/or "
     21                    "MBEDTLS_MD_CAN_SHA256 and/or MBEDTLS_FS_IO not defined.\n");
     22     mbedtls_exit(0);
     23 }
     24 #else
     25 
     26 #include "mbedtls/rsa.h"
     27 
     28 #include <stdio.h>
     29 #include <string.h>
     30 
     31 
     32 int main(int argc, char *argv[])
     33 {
     34     FILE *f;
     35     int ret = 1;
     36     unsigned c;
     37     int exit_code = MBEDTLS_EXIT_FAILURE;
     38     size_t i;
     39     mbedtls_rsa_context rsa;
     40     mbedtls_mpi N, E;
     41     unsigned char hash[32];
     42     unsigned char buf[MBEDTLS_MPI_MAX_SIZE];
     43     char filename[512];
     44 
     45     mbedtls_rsa_init(&rsa);
     46     mbedtls_mpi_init(&N);
     47     mbedtls_mpi_init(&E);
     48 
     49     if (argc != 2) {
     50         mbedtls_printf("usage: rsa_verify <filename>\n");
     51 
     52 #if defined(_WIN32)
     53         mbedtls_printf("\n");
     54 #endif
     55 
     56         goto exit;
     57     }
     58 
     59     mbedtls_printf("\n  . Reading public key from rsa_pub.txt");
     60     fflush(stdout);
     61 
     62     if ((f = fopen("rsa_pub.txt", "rb")) == NULL) {
     63         mbedtls_printf(" failed\n  ! Could not open rsa_pub.txt\n" \
     64                        "  ! Please run rsa_genkey first\n\n");
     65         goto exit;
     66     }
     67 
     68     if ((ret = mbedtls_mpi_read_file(&N, 16, f)) != 0 ||
     69         (ret = mbedtls_mpi_read_file(&E, 16, f)) != 0 ||
     70         (ret = mbedtls_rsa_import(&rsa, &N, NULL, NULL, NULL, &E) != 0)) {
     71         mbedtls_printf(" failed\n  ! mbedtls_mpi_read_file returned %d\n\n", ret);
     72         fclose(f);
     73         goto exit;
     74     }
     75     fclose(f);
     76 
     77     /*
     78      * Extract the RSA signature from the text file
     79      */
     80     mbedtls_snprintf(filename, sizeof(filename), "%s.sig", argv[1]);
     81 
     82     if ((f = fopen(filename, "rb")) == NULL) {
     83         mbedtls_printf("\n  ! Could not open %s\n\n", filename);
     84         goto exit;
     85     }
     86 
     87     i = 0;
     88     while (fscanf(f, "%02X", (unsigned int *) &c) > 0 &&
     89            i < (int) sizeof(buf)) {
     90         buf[i++] = (unsigned char) c;
     91     }
     92 
     93     fclose(f);
     94 
     95     if (i != mbedtls_rsa_get_len(&rsa)) {
     96         mbedtls_printf("\n  ! Invalid RSA signature format\n\n");
     97         goto exit;
     98     }
     99 
    100     /*
    101      * Compute the SHA-256 hash of the input file and
    102      * verify the signature
    103      */
    104     mbedtls_printf("\n  . Verifying the RSA/SHA-256 signature");
    105     fflush(stdout);
    106 
    107     if ((ret = mbedtls_md_file(
    108              mbedtls_md_info_from_type(MBEDTLS_MD_SHA256),
    109              argv[1], hash)) != 0) {
    110         mbedtls_printf(" failed\n  ! Could not open or read %s\n\n", argv[1]);
    111         goto exit;
    112     }
    113 
    114     if ((ret = mbedtls_rsa_pkcs1_verify(&rsa, MBEDTLS_MD_SHA256,
    115                                         32, hash, buf)) != 0) {
    116         mbedtls_printf(" failed\n  ! mbedtls_rsa_pkcs1_verify returned -0x%0x\n\n",
    117                        (unsigned int) -ret);
    118         goto exit;
    119     }
    120 
    121     mbedtls_printf("\n  . OK (the signature is valid)\n\n");
    122 
    123     exit_code = MBEDTLS_EXIT_SUCCESS;
    124 
    125 exit:
    126 
    127     mbedtls_rsa_free(&rsa);
    128     mbedtls_mpi_free(&N);
    129     mbedtls_mpi_free(&E);
    130 
    131     mbedtls_exit(exit_code);
    132 }
    133 #endif /* MBEDTLS_BIGNUM_C && MBEDTLS_RSA_C && MBEDTLS_MD_CAN_SHA256 &&
    134           MBEDTLS_FS_IO */