1 /*
2 * Copyright 2022-2024 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10 /*
11 * Simple aes wrap encryption demonstration program.
12 */
13
14 #include <stdio.h>
15 #include <openssl/err.h>
16 #include <openssl/bio.h>
17 #include <openssl/evp.h>
18 #include <openssl/crypto.h>
19 #include <openssl/core_names.h>
20
21 /* aes key */
22 static const unsigned char wrap_key[] = {
23 0xee, 0xbc, 0x1f, 0x57, 0x48, 0x7f, 0x51, 0x92, 0x1c, 0x04, 0x65, 0x66,
24 0x5f, 0x8a, 0xe6, 0xd1, 0x65, 0x8b, 0xb2, 0x6d, 0xe6, 0xf8, 0xa0, 0x69,
25 0xa3, 0x52, 0x02, 0x93, 0xa5, 0x72, 0x07, 0x8f
26 };
27
28 /* Unique initialisation vector */
29 static const unsigned char wrap_iv[] = {
30 0x99, 0xaa, 0x3e, 0x68, 0xed, 0x81, 0x73, 0xa0, 0xee, 0xd0, 0x66, 0x84,
31 0x99, 0xaa, 0x3e, 0x68,
32 };
33
34 /* Example plaintext to encrypt */
35 static const unsigned char wrap_pt[] = {
36 0xad, 0x4f, 0xc9, 0xfc, 0x77, 0x69, 0xc9, 0xea, 0xfc, 0xdf, 0x00, 0xac,
37 0x34, 0xec, 0x40, 0xbc, 0x28, 0x3f, 0xa4, 0x5e, 0xd8, 0x99, 0xe4, 0x5d,
38 0x5e, 0x7a, 0xc4, 0xe6, 0xca, 0x7b, 0xa5, 0xb7,
39 };
40
41 /* Expected ciphertext value */
42 static const unsigned char wrap_ct[] = {
43 0x97, 0x99, 0x55, 0xca, 0xf6, 0x3e, 0x95, 0x54, 0x39, 0xd6, 0xaf, 0x63, 0xff, 0x2c, 0xe3, 0x96,
44 0xf7, 0x0d, 0x2c, 0x9c, 0xc7, 0x43, 0xc0, 0xb6, 0x31, 0x43, 0xb9, 0x20, 0xac, 0x6b, 0xd3, 0x67,
45 0xad, 0x01, 0xaf, 0xa7, 0x32, 0x74, 0x26, 0x92,
46 };
47
48 /*
49 * A library context and property query can be used to select & filter
50 * algorithm implementations. If they are NULL then the default library
51 * context and properties are used.
52 */
53 static OSSL_LIB_CTX *libctx = NULL;
54 static const char *propq = NULL;
55
aes_wrap_encrypt(void)56 static int aes_wrap_encrypt(void)
57 {
58 int ret = 0;
59 EVP_CIPHER_CTX *ctx;
60 EVP_CIPHER *cipher = NULL;
61 int outlen, tmplen;
62 unsigned char outbuf[1024];
63
64 printf("aes wrap Encrypt:\n");
65 printf("Plaintext:\n");
66 BIO_dump_fp(stdout, wrap_pt, sizeof(wrap_pt));
67
68 /* Create a context for the encrypt operation */
69 if ((ctx = EVP_CIPHER_CTX_new()) == NULL)
70 goto err;
71
72 EVP_CIPHER_CTX_set_flags(ctx, EVP_CIPHER_CTX_FLAG_WRAP_ALLOW);
73
74 /* Fetch the cipher implementation */
75 if ((cipher = EVP_CIPHER_fetch(libctx, "AES-256-WRAP", propq)) == NULL)
76 goto err;
77
78 /*
79 * Initialise an encrypt operation with the cipher/mode, key and IV.
80 * We are not setting any custom params so let params be just NULL.
81 */
82 if (!EVP_EncryptInit_ex2(ctx, cipher, wrap_key, wrap_iv, /* params */ NULL))
83 goto err;
84
85 /* Encrypt plaintext */
86 if (!EVP_EncryptUpdate(ctx, outbuf, &outlen, wrap_pt, sizeof(wrap_pt)))
87 goto err;
88
89 /* Finalise: there can be some additional output from padding */
90 if (!EVP_EncryptFinal_ex(ctx, outbuf + outlen, &tmplen))
91 goto err;
92 outlen += tmplen;
93
94 /* Output encrypted block */
95 printf("Ciphertext (outlen:%d):\n", outlen);
96 BIO_dump_fp(stdout, outbuf, outlen);
97
98 if (sizeof(wrap_ct) == outlen && !CRYPTO_memcmp(outbuf, wrap_ct, outlen))
99 printf("Final ciphertext matches expected ciphertext\n");
100 else
101 printf("Final ciphertext differs from expected ciphertext\n");
102
103 ret = 1;
104 err:
105 if (!ret)
106 ERR_print_errors_fp(stderr);
107
108 EVP_CIPHER_free(cipher);
109 EVP_CIPHER_CTX_free(ctx);
110
111 return ret;
112 }
113
aes_wrap_decrypt(void)114 static int aes_wrap_decrypt(void)
115 {
116 int ret = 0;
117 EVP_CIPHER_CTX *ctx;
118 EVP_CIPHER *cipher = NULL;
119 int outlen, tmplen;
120 unsigned char outbuf[1024];
121
122 printf("aes wrap Decrypt:\n");
123 printf("Ciphertext:\n");
124 BIO_dump_fp(stdout, wrap_ct, sizeof(wrap_ct));
125
126 if ((ctx = EVP_CIPHER_CTX_new()) == NULL)
127 goto err;
128
129 EVP_CIPHER_CTX_set_flags(ctx, EVP_CIPHER_CTX_FLAG_WRAP_ALLOW);
130
131 /* Fetch the cipher implementation */
132 if ((cipher = EVP_CIPHER_fetch(libctx, "aes-256-wrap", propq)) == NULL)
133 goto err;
134
135 /*
136 * Initialise an encrypt operation with the cipher/mode, key and IV.
137 * We are not setting any custom params so let params be just NULL.
138 */
139 if (!EVP_DecryptInit_ex2(ctx, cipher, wrap_key, wrap_iv, /* params */ NULL))
140 goto err;
141
142 /* Decrypt plaintext */
143 if (!EVP_DecryptUpdate(ctx, outbuf, &outlen, wrap_ct, sizeof(wrap_ct)))
144 goto err;
145
146 /* Finalise: there can be some additional output from padding */
147 if (!EVP_DecryptFinal_ex(ctx, outbuf + outlen, &tmplen))
148 goto err;
149 outlen += tmplen;
150
151 /* Output decrypted block */
152 printf("Plaintext (outlen:%d):\n", outlen);
153 BIO_dump_fp(stdout, outbuf, outlen);
154
155 if (sizeof(wrap_pt) == outlen && !CRYPTO_memcmp(outbuf, wrap_pt, outlen))
156 printf("Final plaintext matches original plaintext\n");
157 else
158 printf("Final plaintext differs from original plaintext\n");
159
160 ret = 1;
161 err:
162 if (!ret)
163 ERR_print_errors_fp(stderr);
164
165 EVP_CIPHER_free(cipher);
166 EVP_CIPHER_CTX_free(ctx);
167
168 return ret;
169 }
170
main(int argc,char ** argv)171 int main(int argc, char **argv)
172 {
173 if (!aes_wrap_encrypt())
174 return EXIT_FAILURE;
175
176 if (!aes_wrap_decrypt())
177 return EXIT_FAILURE;
178
179 return EXIT_SUCCESS;
180 }
181
