1 /* 2 * Copyright 2022 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 OSSL_LIB_CTX *libctx = NULL; 54 const char *propq = NULL; 55 56 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 } 113 114 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 } 170 171 int main(int argc, char **argv) 172 { 173 if (!aes_wrap_encrypt()) 174 return 1; 175 176 if (!aes_wrap_decrypt()) 177 return 1; 178 179 return 0; 180 } 181 182