1 /*
2 * RSA simple data encryption program
3 *
4 * Copyright The Mbed TLS Contributors
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
20 #include "mbedtls/build_info.h"
21
22 #include "mbedtls/platform.h"
23
24 #if defined(MBEDTLS_BIGNUM_C) && defined(MBEDTLS_PK_PARSE_C) && \
25 defined(MBEDTLS_ENTROPY_C) && defined(MBEDTLS_FS_IO) && \
26 defined(MBEDTLS_CTR_DRBG_C)
27 #include "mbedtls/error.h"
28 #include "mbedtls/pk.h"
29 #include "mbedtls/entropy.h"
30 #include "mbedtls/ctr_drbg.h"
31
32 #include <stdio.h>
33 #include <string.h>
34 #endif
35
36 #if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_PK_PARSE_C) || \
37 !defined(MBEDTLS_ENTROPY_C) || !defined(MBEDTLS_FS_IO) || \
38 !defined(MBEDTLS_CTR_DRBG_C)
main(void)39 int main(void)
40 {
41 mbedtls_printf("MBEDTLS_BIGNUM_C and/or MBEDTLS_PK_PARSE_C and/or "
42 "MBEDTLS_ENTROPY_C and/or MBEDTLS_FS_IO and/or "
43 "MBEDTLS_CTR_DRBG_C not defined.\n");
44 mbedtls_exit(0);
45 }
46 #else
47
48
main(int argc,char * argv[])49 int main(int argc, char *argv[])
50 {
51 FILE *f;
52 int ret = 1;
53 int exit_code = MBEDTLS_EXIT_FAILURE;
54 size_t i, olen = 0;
55 mbedtls_pk_context pk;
56 mbedtls_entropy_context entropy;
57 mbedtls_ctr_drbg_context ctr_drbg;
58 unsigned char input[1024];
59 unsigned char buf[512];
60 const char *pers = "mbedtls_pk_encrypt";
61
62 mbedtls_ctr_drbg_init(&ctr_drbg);
63 mbedtls_entropy_init(&entropy);
64 mbedtls_pk_init(&pk);
65
66 if (argc != 3) {
67 mbedtls_printf("usage: mbedtls_pk_encrypt <key_file> <string of max 100 characters>\n");
68
69 #if defined(_WIN32)
70 mbedtls_printf("\n");
71 #endif
72
73 goto exit;
74 }
75
76 mbedtls_printf("\n . Seeding the random number generator...");
77 fflush(stdout);
78
79 if ((ret = mbedtls_ctr_drbg_seed(&ctr_drbg, mbedtls_entropy_func,
80 &entropy, (const unsigned char *) pers,
81 strlen(pers))) != 0) {
82 mbedtls_printf(" failed\n ! mbedtls_ctr_drbg_seed returned -0x%04x\n",
83 (unsigned int) -ret);
84 goto exit;
85 }
86
87 mbedtls_printf("\n . Reading public key from '%s'", argv[1]);
88 fflush(stdout);
89
90 if ((ret = mbedtls_pk_parse_public_keyfile(&pk, argv[1])) != 0) {
91 mbedtls_printf(" failed\n ! mbedtls_pk_parse_public_keyfile returned -0x%04x\n",
92 (unsigned int) -ret);
93 goto exit;
94 }
95
96 if (strlen(argv[2]) > 100) {
97 mbedtls_printf(" Input data larger than 100 characters.\n\n");
98 goto exit;
99 }
100
101 memcpy(input, argv[2], strlen(argv[2]));
102
103 /*
104 * Calculate the RSA encryption of the hash.
105 */
106 mbedtls_printf("\n . Generating the encrypted value");
107 fflush(stdout);
108
109 if ((ret = mbedtls_pk_encrypt(&pk, input, strlen(argv[2]),
110 buf, &olen, sizeof(buf),
111 mbedtls_ctr_drbg_random, &ctr_drbg)) != 0) {
112 mbedtls_printf(" failed\n ! mbedtls_pk_encrypt returned -0x%04x\n",
113 (unsigned int) -ret);
114 goto exit;
115 }
116
117 /*
118 * Write the signature into result-enc.txt
119 */
120 if ((f = fopen("result-enc.txt", "wb+")) == NULL) {
121 mbedtls_printf(" failed\n ! Could not create %s\n\n",
122 "result-enc.txt");
123 ret = 1;
124 goto exit;
125 }
126
127 for (i = 0; i < olen; i++) {
128 mbedtls_fprintf(f, "%02X%s", buf[i],
129 (i + 1) % 16 == 0 ? "\r\n" : " ");
130 }
131
132 fclose(f);
133
134 mbedtls_printf("\n . Done (created \"%s\")\n\n", "result-enc.txt");
135
136 exit_code = MBEDTLS_EXIT_SUCCESS;
137
138 exit:
139
140 mbedtls_pk_free(&pk);
141 mbedtls_entropy_free(&entropy);
142 mbedtls_ctr_drbg_free(&ctr_drbg);
143
144 #if defined(MBEDTLS_ERROR_C)
145 if (exit_code != MBEDTLS_EXIT_SUCCESS) {
146 mbedtls_strerror(ret, (char *) buf, sizeof(buf));
147 mbedtls_printf(" ! Last error was: %s\n", buf);
148 }
149 #endif
150
151 mbedtls_exit(exit_code);
152 }
153 #endif /* MBEDTLS_BIGNUM_C && MBEDTLS_PK_PARSE_C && MBEDTLS_ENTROPY_C &&
154 MBEDTLS_FS_IO && MBEDTLS_CTR_DRBG_C */
155