static int rsa_sign_wrap( void *ctx, mbedtls_md_type_t md_alg, const unsigned char *hash, size_t hash_len, unsigned char *sig, size_t *sig_len, int (*f_rng)(void *, unsigned char *, size_t), void *p_rng ) { *sig_len = ((mbedtls_rsa_context *) ctx)->len; return( mbedtls_rsa_pkcs1_sign( (mbedtls_rsa_context *) ctx, f_rng, p_rng, MBEDTLS_RSA_PRIVATE, md_alg, (unsigned int) hash_len, hash, sig ) ); }
static int rsa_sign_wrap( void *ctx, mbedtls_md_type_t md_alg, const unsigned char *hash, size_t hash_len, unsigned char *sig, size_t *sig_len, int (*f_rng)(void *, unsigned char *, size_t), void *p_rng ) { mbedtls_rsa_context * rsa = (mbedtls_rsa_context *) ctx; #if SIZE_MAX > UINT_MAX if( md_alg == MBEDTLS_MD_NONE && UINT_MAX < hash_len ) return( MBEDTLS_ERR_PK_BAD_INPUT_DATA ); #endif /* SIZE_MAX > UINT_MAX */ *sig_len = mbedtls_rsa_get_len( rsa ); return( mbedtls_rsa_pkcs1_sign( rsa, f_rng, p_rng, MBEDTLS_RSA_PRIVATE, md_alg, (unsigned int) hash_len, hash, sig ) ); }
int main( int argc, char *argv[] ) { FILE *f; int ret = 1; int exit_code = MBEDTLS_EXIT_FAILURE; size_t i; mbedtls_rsa_context rsa; unsigned char hash[32]; unsigned char buf[MBEDTLS_MPI_MAX_SIZE]; char filename[512]; mbedtls_mpi N, P, Q, D, E, DP, DQ, QP; mbedtls_rsa_init( &rsa, MBEDTLS_RSA_PKCS_V15, 0 ); mbedtls_mpi_init( &N ); mbedtls_mpi_init( &P ); mbedtls_mpi_init( &Q ); mbedtls_mpi_init( &D ); mbedtls_mpi_init( &E ); mbedtls_mpi_init( &DP ); mbedtls_mpi_init( &DQ ); mbedtls_mpi_init( &QP ); if( argc != 2 ) { mbedtls_printf( "usage: rsa_sign <filename>\n" ); #if defined(_WIN32) mbedtls_printf( "\n" ); #endif goto exit; } mbedtls_printf( "\n . Reading private key from rsa_priv.txt" ); fflush( stdout ); if( ( f = fopen( "rsa_priv.txt", "rb" ) ) == NULL ) { mbedtls_printf( " failed\n ! Could not open rsa_priv.txt\n" \ " ! Please run rsa_genkey first\n\n" ); goto exit; } if( ( ret = mbedtls_mpi_read_file( &N , 16, f ) ) != 0 || ( ret = mbedtls_mpi_read_file( &E , 16, f ) ) != 0 || ( ret = mbedtls_mpi_read_file( &D , 16, f ) ) != 0 || ( ret = mbedtls_mpi_read_file( &P , 16, f ) ) != 0 || ( ret = mbedtls_mpi_read_file( &Q , 16, f ) ) != 0 || ( ret = mbedtls_mpi_read_file( &DP , 16, f ) ) != 0 || ( ret = mbedtls_mpi_read_file( &DQ , 16, f ) ) != 0 || ( ret = mbedtls_mpi_read_file( &QP , 16, f ) ) != 0 ) { mbedtls_printf( " failed\n ! mbedtls_mpi_read_file returned %d\n\n", ret ); fclose( f ); goto exit; } fclose( f ); if( ( ret = mbedtls_rsa_import( &rsa, &N, &P, &Q, &D, &E ) ) != 0 ) { mbedtls_printf( " failed\n ! mbedtls_rsa_import returned %d\n\n", ret ); goto exit; } if( ( ret = mbedtls_rsa_complete( &rsa ) ) != 0 ) { mbedtls_printf( " failed\n ! mbedtls_rsa_complete returned %d\n\n", ret ); goto exit; } mbedtls_printf( "\n . Checking the private key" ); fflush( stdout ); if( ( ret = mbedtls_rsa_check_privkey( &rsa ) ) != 0 ) { mbedtls_printf( " failed\n ! mbedtls_rsa_check_privkey failed with -0x%0x\n", -ret ); goto exit; } /* * Compute the SHA-256 hash of the input file, * then calculate the RSA signature of the hash. */ mbedtls_printf( "\n . Generating the RSA/SHA-256 signature" ); fflush( stdout ); if( ( ret = mbedtls_md_file( mbedtls_md_info_from_type( MBEDTLS_MD_SHA256 ), argv[1], hash ) ) != 0 ) { mbedtls_printf( " failed\n ! Could not open or read %s\n\n", argv[1] ); goto exit; } if( ( ret = mbedtls_rsa_pkcs1_sign( &rsa, NULL, NULL, MBEDTLS_RSA_PRIVATE, MBEDTLS_MD_SHA256, 20, hash, buf ) ) != 0 ) { mbedtls_printf( " failed\n ! mbedtls_rsa_pkcs1_sign returned -0x%0x\n\n", -ret ); goto exit; } /* * Write the signature into <filename>.sig */ mbedtls_snprintf( filename, sizeof(filename), "%s.sig", argv[1] ); if( ( f = fopen( filename, "wb+" ) ) == NULL ) { mbedtls_printf( " failed\n ! Could not create %s\n\n", argv[1] ); goto exit; } for( i = 0; i < rsa.len; i++ ) mbedtls_fprintf( f, "%02X%s", buf[i], ( i + 1 ) % 16 == 0 ? "\r\n" : " " ); fclose( f ); mbedtls_printf( "\n . Done (created \"%s\")\n\n", filename ); exit_code = MBEDTLS_EXIT_SUCCESS; exit: mbedtls_rsa_free( &rsa ); mbedtls_mpi_free( &N ); mbedtls_mpi_free( &P ); mbedtls_mpi_free( &Q ); mbedtls_mpi_free( &D ); mbedtls_mpi_free( &E ); mbedtls_mpi_free( &DP ); mbedtls_mpi_free( &DQ ); mbedtls_mpi_free( &QP ); #if defined(_WIN32) mbedtls_printf( " + Press Enter to exit this program.\n" ); fflush( stdout ); getchar(); #endif return( exit_code ); }