diff options
Diffstat (limited to 'lib/mbedtls-2.27.0/programs/pkey/rsa_decrypt.c')
| -rw-r--r-- | lib/mbedtls-2.27.0/programs/pkey/rsa_decrypt.c | 210 |
1 files changed, 210 insertions, 0 deletions
diff --git a/lib/mbedtls-2.27.0/programs/pkey/rsa_decrypt.c b/lib/mbedtls-2.27.0/programs/pkey/rsa_decrypt.c new file mode 100644 index 0000000..01bf3a6 --- /dev/null +++ b/lib/mbedtls-2.27.0/programs/pkey/rsa_decrypt.c @@ -0,0 +1,210 @@ +/* + * RSA simple decryption program + * + * Copyright The Mbed TLS Contributors + * SPDX-License-Identifier: Apache-2.0 + * + * Licensed under the Apache License, Version 2.0 (the "License"); you may + * not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT + * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +#if !defined(MBEDTLS_CONFIG_FILE) +#include "mbedtls/config.h" +#else +#include MBEDTLS_CONFIG_FILE +#endif + +#if defined(MBEDTLS_PLATFORM_C) +#include "mbedtls/platform.h" +#else +#include <stdio.h> +#include <stdlib.h> +#define mbedtls_printf printf +#define mbedtls_exit exit +#define MBEDTLS_EXIT_SUCCESS EXIT_SUCCESS +#define MBEDTLS_EXIT_FAILURE EXIT_FAILURE +#endif /* MBEDTLS_PLATFORM_C */ + +#if defined(MBEDTLS_BIGNUM_C) && defined(MBEDTLS_RSA_C) && \ + defined(MBEDTLS_FS_IO) && defined(MBEDTLS_ENTROPY_C) && \ + defined(MBEDTLS_CTR_DRBG_C) +#include "mbedtls/rsa.h" +#include "mbedtls/entropy.h" +#include "mbedtls/ctr_drbg.h" + +#include <string.h> + +#endif + +#if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_RSA_C) || \ + !defined(MBEDTLS_FS_IO) || !defined(MBEDTLS_ENTROPY_C) || \ + !defined(MBEDTLS_CTR_DRBG_C) +int main( void ) +{ + mbedtls_printf("MBEDTLS_BIGNUM_C and/or MBEDTLS_RSA_C and/or " + "MBEDTLS_FS_IO and/or MBEDTLS_ENTROPY_C and/or " + "MBEDTLS_CTR_DRBG_C not defined.\n"); + mbedtls_exit( 0 ); +} +#else + + +int main( int argc, char *argv[] ) +{ + FILE *f; + int ret = 1; + int exit_code = MBEDTLS_EXIT_FAILURE; + unsigned c; + size_t i; + mbedtls_rsa_context rsa; + mbedtls_mpi N, P, Q, D, E, DP, DQ, QP; + mbedtls_entropy_context entropy; + mbedtls_ctr_drbg_context ctr_drbg; + unsigned char result[1024]; + unsigned char buf[512]; + const char *pers = "rsa_decrypt"; + ((void) argv); + + memset(result, 0, sizeof( result ) ); + + if( argc != 1 ) + { + mbedtls_printf( "usage: rsa_decrypt\n" ); + +#if defined(_WIN32) + mbedtls_printf( "\n" ); +#endif + + mbedtls_exit( exit_code ); + } + + mbedtls_printf( "\n . Seeding the random number generator..." ); + fflush( stdout ); + + mbedtls_rsa_init( &rsa, MBEDTLS_RSA_PKCS_V15, 0 ); + mbedtls_ctr_drbg_init( &ctr_drbg ); + mbedtls_entropy_init( &entropy ); + 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 ); + + ret = mbedtls_ctr_drbg_seed( &ctr_drbg, mbedtls_entropy_func, + &entropy, (const unsigned char *) pers, + strlen( pers ) ); + if( ret != 0 ) + { + mbedtls_printf( " failed\n ! mbedtls_ctr_drbg_seed returned %d\n", + ret ); + 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; + } + + /* + * Extract the RSA encrypted value from the text file + */ + if( ( f = fopen( "result-enc.txt", "rb" ) ) == NULL ) + { + mbedtls_printf( "\n ! Could not open %s\n\n", "result-enc.txt" ); + goto exit; + } + + i = 0; + + while( fscanf( f, "%02X", (unsigned int*) &c ) > 0 && + i < (int) sizeof( buf ) ) + buf[i++] = (unsigned char) c; + + fclose( f ); + + if( i != rsa.len ) + { + mbedtls_printf( "\n ! Invalid RSA signature format\n\n" ); + goto exit; + } + + /* + * Decrypt the encrypted RSA data and print the result. + */ + mbedtls_printf( "\n . Decrypting the encrypted data" ); + fflush( stdout ); + + ret = mbedtls_rsa_pkcs1_decrypt( &rsa, mbedtls_ctr_drbg_random, + &ctr_drbg, MBEDTLS_RSA_PRIVATE, &i, + buf, result, 1024 ); + if( ret != 0 ) + { + mbedtls_printf( " failed\n ! mbedtls_rsa_pkcs1_decrypt returned %d\n\n", + ret ); + goto exit; + } + + mbedtls_printf( "\n . OK\n\n" ); + + mbedtls_printf( "The decrypted result is: '%s'\n\n", result ); + + exit_code = MBEDTLS_EXIT_SUCCESS; + +exit: + mbedtls_ctr_drbg_free( &ctr_drbg ); + mbedtls_entropy_free( &entropy ); + 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 + + mbedtls_exit( exit_code ); +} +#endif /* MBEDTLS_BIGNUM_C && MBEDTLS_RSA_C && MBEDTLS_FS_IO */ |