1 /* 2 * Copyright 2022-2026 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, 31 0x66, 0x84, 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, 37 0x00, 0xac, 0x34, 0xec, 0x40, 0xbc, 0x28, 0x3f, 0xa4, 0x5e, 38 0xd8, 0x99, 0xe4, 0x5d, 0x5e, 0x7a, 0xc4, 0xe6, 0xca, 0x7b, 39 0xa5, 0xb7 40 }; 41 42 /* Expected ciphertext value */ 43 static const unsigned char wrap_ct[] = { 44 0x97, 0x99, 0x55, 0xca, 0xf6, 0x3e, 0x95, 0x54, 0x39, 0xd6, 45 0xaf, 0x63, 0xff, 0x2c, 0xe3, 0x96, 0xf7, 0x0d, 0x2c, 0x9c, 46 0xc7, 0x43, 0xc0, 0xb6, 0x31, 0x43, 0xb9, 0x20, 0xac, 0x6b, 47 0xd3, 0x67, 0xad, 0x01, 0xaf, 0xa7, 0x32, 0x74, 0x26, 0x92 48 }; 49 50 /* 51 * A library context and property query can be used to select & filter 52 * algorithm implementations. If they are NULL then the default library 53 * context and properties are used. 54 */ 55 static OSSL_LIB_CTX *libctx = NULL; 56 static const char *propq = NULL; 57 58 static int aes_wrap_encrypt(void) 59 { 60 int ret = 0; 61 EVP_CIPHER_CTX *ctx; 62 EVP_CIPHER *cipher = NULL; 63 int outlen, tmplen; 64 unsigned char outbuf[1024]; 65 66 printf("aes wrap Encrypt:\n"); 67 printf("Plaintext:\n"); 68 BIO_dump_fp(stdout, wrap_pt, sizeof(wrap_pt)); 69 70 /* Create a context for the encrypt operation */ 71 if ((ctx = EVP_CIPHER_CTX_new()) == NULL) 72 goto err; 73 74 EVP_CIPHER_CTX_set_flags(ctx, EVP_CIPHER_CTX_FLAG_WRAP_ALLOW); 75 76 /* Fetch the cipher implementation */ 77 if ((cipher = EVP_CIPHER_fetch(libctx, "AES-256-WRAP", propq)) == NULL) 78 goto err; 79 80 /* 81 * Initialise an encrypt operation with the cipher/mode, key and IV. 82 * We are not setting any custom params so let params be just NULL. 83 */ 84 if (!EVP_EncryptInit_ex2(ctx, cipher, wrap_key, wrap_iv, /* params */ NULL)) 85 goto err; 86 87 /* Encrypt plaintext */ 88 if (!EVP_EncryptUpdate(ctx, outbuf, &outlen, wrap_pt, sizeof(wrap_pt))) 89 goto err; 90 91 /* Finalise: there can be some additional output from padding */ 92 if (!EVP_EncryptFinal_ex(ctx, outbuf + outlen, &tmplen)) 93 goto err; 94 outlen += tmplen; 95 96 /* Output encrypted block */ 97 printf("Ciphertext (outlen:%d):\n", outlen); 98 BIO_dump_fp(stdout, outbuf, outlen); 99 100 if (sizeof(wrap_ct) == outlen && !CRYPTO_memcmp(outbuf, wrap_ct, outlen)) 101 printf("Final ciphertext matches expected ciphertext\n"); 102 else 103 printf("Final ciphertext differs from expected ciphertext\n"); 104 105 ret = 1; 106 err: 107 if (!ret) 108 ERR_print_errors_fp(stderr); 109 110 EVP_CIPHER_free(cipher); 111 EVP_CIPHER_CTX_free(ctx); 112 113 return ret; 114 } 115 116 static int aes_wrap_decrypt(void) 117 { 118 int ret = 0; 119 EVP_CIPHER_CTX *ctx; 120 EVP_CIPHER *cipher = NULL; 121 int outlen, tmplen; 122 unsigned char outbuf[1024]; 123 124 printf("aes wrap Decrypt:\n"); 125 printf("Ciphertext:\n"); 126 BIO_dump_fp(stdout, wrap_ct, sizeof(wrap_ct)); 127 128 if ((ctx = EVP_CIPHER_CTX_new()) == NULL) 129 goto err; 130 131 EVP_CIPHER_CTX_set_flags(ctx, EVP_CIPHER_CTX_FLAG_WRAP_ALLOW); 132 133 /* Fetch the cipher implementation */ 134 if ((cipher = EVP_CIPHER_fetch(libctx, "aes-256-wrap", propq)) == NULL) 135 goto err; 136 137 /* 138 * Initialise an encrypt operation with the cipher/mode, key and IV. 139 * We are not setting any custom params so let params be just NULL. 140 */ 141 if (!EVP_DecryptInit_ex2(ctx, cipher, wrap_key, wrap_iv, /* params */ NULL)) 142 goto err; 143 144 /* Decrypt plaintext */ 145 if (!EVP_DecryptUpdate(ctx, outbuf, &outlen, wrap_ct, sizeof(wrap_ct))) 146 goto err; 147 148 /* Finalise: there can be some additional output from padding */ 149 if (!EVP_DecryptFinal_ex(ctx, outbuf + outlen, &tmplen)) 150 goto err; 151 outlen += tmplen; 152 153 /* Output decrypted block */ 154 printf("Plaintext (outlen:%d):\n", outlen); 155 BIO_dump_fp(stdout, outbuf, outlen); 156 157 if (sizeof(wrap_pt) == outlen && !CRYPTO_memcmp(outbuf, wrap_pt, outlen)) 158 printf("Final plaintext matches original plaintext\n"); 159 else 160 printf("Final plaintext differs from original plaintext\n"); 161 162 ret = 1; 163 err: 164 if (!ret) 165 ERR_print_errors_fp(stderr); 166 167 EVP_CIPHER_free(cipher); 168 EVP_CIPHER_CTX_free(ctx); 169 170 return ret; 171 } 172 173 int main(int argc, char **argv) 174 { 175 if (!aes_wrap_encrypt()) 176 return EXIT_FAILURE; 177 178 if (!aes_wrap_decrypt()) 179 return EXIT_FAILURE; 180 181 return EXIT_SUCCESS; 182 } 183