1 /*
2 * Simple MPI demonstration program
3 *
4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
5 * SPDX-License-Identifier: Apache-2.0
6 *
7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
8 * not use this file except in compliance with the License.
9 * You may obtain a copy of the License at
10 *
11 * http://www.apache.org/licenses/LICENSE-2.0
12 *
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
18 *
19 * This file is part of mbed TLS (https://tls.mbed.org)
20 */
21
22 #if !defined(MBEDTLS_CONFIG_FILE)
23 #include "mbedtls/config.h"
24 #else
25 #include MBEDTLS_CONFIG_FILE
26 #endif
27
28 #if defined(MBEDTLS_PLATFORM_C)
29 #include "mbedtls/platform.h"
30 #else
31 #include <stdio.h>
32 #include <stdlib.h>
33 #define mbedtls_printf printf
34 #define mbedtls_exit exit
35 #define MBEDTLS_EXIT_SUCCESS EXIT_SUCCESS
36 #define MBEDTLS_EXIT_FAILURE EXIT_FAILURE
37 #endif /* MBEDTLS_PLATFORM_C */
38
39 #if defined(MBEDTLS_BIGNUM_C) && defined(MBEDTLS_FS_IO)
40 #include "mbedtls/bignum.h"
41
42 #include <stdio.h>
43 #endif
44
45 #if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_FS_IO)
main(void)46 int main( void )
47 {
48 mbedtls_printf("MBEDTLS_BIGNUM_C and/or MBEDTLS_FS_IO not defined.\n");
49 return( 0 );
50 }
51 #else
52
53 #if defined(MBEDTLS_CHECK_PARAMS)
54 #include "mbedtls/platform_util.h"
mbedtls_param_failed(const char * failure_condition,const char * file,int line)55 void mbedtls_param_failed( const char *failure_condition,
56 const char *file,
57 int line )
58 {
59 mbedtls_printf( "%s:%i: Input param failed - %s\n",
60 file, line, failure_condition );
61 mbedtls_exit( MBEDTLS_EXIT_FAILURE );
62 }
63 #endif
64
main(void)65 int main( void )
66 {
67 int ret = 1;
68 int exit_code = MBEDTLS_EXIT_FAILURE;
69 mbedtls_mpi E, P, Q, N, H, D, X, Y, Z;
70
71 mbedtls_mpi_init( &E ); mbedtls_mpi_init( &P ); mbedtls_mpi_init( &Q ); mbedtls_mpi_init( &N );
72 mbedtls_mpi_init( &H ); mbedtls_mpi_init( &D ); mbedtls_mpi_init( &X ); mbedtls_mpi_init( &Y );
73 mbedtls_mpi_init( &Z );
74
75 MBEDTLS_MPI_CHK( mbedtls_mpi_read_string( &P, 10, "2789" ) );
76 MBEDTLS_MPI_CHK( mbedtls_mpi_read_string( &Q, 10, "3203" ) );
77 MBEDTLS_MPI_CHK( mbedtls_mpi_read_string( &E, 10, "257" ) );
78 MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( &N, &P, &Q ) );
79
80 mbedtls_printf( "\n Public key:\n\n" );
81 MBEDTLS_MPI_CHK( mbedtls_mpi_write_file( " N = ", &N, 10, NULL ) );
82 MBEDTLS_MPI_CHK( mbedtls_mpi_write_file( " E = ", &E, 10, NULL ) );
83
84 mbedtls_printf( "\n Private key:\n\n" );
85 MBEDTLS_MPI_CHK( mbedtls_mpi_write_file( " P = ", &P, 10, NULL ) );
86 MBEDTLS_MPI_CHK( mbedtls_mpi_write_file( " Q = ", &Q, 10, NULL ) );
87
88 #if defined(MBEDTLS_GENPRIME)
89 MBEDTLS_MPI_CHK( mbedtls_mpi_sub_int( &P, &P, 1 ) );
90 MBEDTLS_MPI_CHK( mbedtls_mpi_sub_int( &Q, &Q, 1 ) );
91 MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( &H, &P, &Q ) );
92 MBEDTLS_MPI_CHK( mbedtls_mpi_inv_mod( &D, &E, &H ) );
93
94 mbedtls_mpi_write_file( " D = E^-1 mod (P-1)*(Q-1) = ",
95 &D, 10, NULL );
96 #else
97 mbedtls_printf("\nTest skipped (MBEDTLS_GENPRIME not defined).\n\n");
98 #endif
99 MBEDTLS_MPI_CHK( mbedtls_mpi_read_string( &X, 10, "55555" ) );
100 MBEDTLS_MPI_CHK( mbedtls_mpi_exp_mod( &Y, &X, &E, &N, NULL ) );
101 MBEDTLS_MPI_CHK( mbedtls_mpi_exp_mod( &Z, &Y, &D, &N, NULL ) );
102
103 mbedtls_printf( "\n RSA operation:\n\n" );
104 MBEDTLS_MPI_CHK( mbedtls_mpi_write_file( " X (plaintext) = ", &X, 10, NULL ) );
105 MBEDTLS_MPI_CHK( mbedtls_mpi_write_file( " Y (ciphertext) = X^E mod N = ", &Y, 10, NULL ) );
106 MBEDTLS_MPI_CHK( mbedtls_mpi_write_file( " Z (decrypted) = Y^D mod N = ", &Z, 10, NULL ) );
107 mbedtls_printf( "\n" );
108
109 exit_code = MBEDTLS_EXIT_SUCCESS;
110
111 cleanup:
112 mbedtls_mpi_free( &E ); mbedtls_mpi_free( &P ); mbedtls_mpi_free( &Q ); mbedtls_mpi_free( &N );
113 mbedtls_mpi_free( &H ); mbedtls_mpi_free( &D ); mbedtls_mpi_free( &X ); mbedtls_mpi_free( &Y );
114 mbedtls_mpi_free( &Z );
115
116 if( exit_code != MBEDTLS_EXIT_SUCCESS )
117 {
118 mbedtls_printf( "\nAn error occurred.\n" );
119 }
120
121 #if defined(_WIN32)
122 mbedtls_printf( " Press Enter to exit this program.\n" );
123 fflush( stdout ); getchar();
124 #endif
125
126 return( exit_code );
127 }
128 #endif /* MBEDTLS_BIGNUM_C && MBEDTLS_FS_IO */
129