demos/cipher/aeskeywrap.c

   1 /*
   2  * Copyright 2022-2023 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 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
 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
 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 }