| 1 | /*
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| 2 | * Copyright (c) 2006 - 2008 Kungliga Tekniska Högskolan
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| 3 | * (Royal Institute of Technology, Stockholm, Sweden).
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| 4 | * All rights reserved.
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| 5 | *
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| 6 | * Redistribution and use in source and binary forms, with or without
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| 7 | * modification, are permitted provided that the following conditions
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| 8 | * are met:
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| 9 | *
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| 10 | * 1. Redistributions of source code must retain the above copyright
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| 11 | * notice, this list of conditions and the following disclaimer.
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| 12 | *
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| 13 | * 2. Redistributions in binary form must reproduce the above copyright
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| 14 | * notice, this list of conditions and the following disclaimer in the
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| 15 | * documentation and/or other materials provided with the distribution.
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| 16 | *
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| 17 | * 3. Neither the name of the Institute nor the names of its contributors
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| 18 | * may be used to endorse or promote products derived from this software
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| 19 | * without specific prior written permission.
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| 20 | *
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| 21 | * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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| 22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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| 23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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| 24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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| 25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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| 26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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| 27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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| 28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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| 29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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| 30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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| 31 | * SUCH DAMAGE.
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| 32 | */
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| 33 |
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| 34 | #include <config.h>
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| 35 |
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| 36 | #define HC_DEPRECATED
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| 37 |
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| 38 | #include <sys/types.h>
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| 39 | #include <stdio.h>
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| 40 | #include <stdlib.h>
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| 41 | #include <string.h>
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| 42 | #include <assert.h>
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| 43 |
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| 44 | #include <evp.h>
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| 45 |
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| 46 | #include <krb5-types.h>
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| 47 |
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| 48 | #include <aes.h>
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| 49 |
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| 50 | /*
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| 51 | *
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| 52 | */
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| 53 |
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| 54 | static int
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| 55 | aes_init(EVP_CIPHER_CTX *ctx,
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| 56 | const unsigned char * key,
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| 57 | const unsigned char * iv,
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| 58 | int encp)
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| 59 | {
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| 60 | AES_KEY *k = ctx->cipher_data;
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| 61 | if (ctx->encrypt)
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| 62 | AES_set_encrypt_key(key, ctx->cipher->key_len * 8, k);
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| 63 | else
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| 64 | AES_set_decrypt_key(key, ctx->cipher->key_len * 8, k);
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| 65 | return 1;
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| 66 | }
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| 67 |
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| 68 | static int
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| 69 | aes_do_cipher(EVP_CIPHER_CTX *ctx,
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| 70 | unsigned char *out,
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| 71 | const unsigned char *in,
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| 72 | unsigned int size)
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| 73 | {
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| 74 | AES_KEY *k = ctx->cipher_data;
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| 75 | AES_cbc_encrypt(in, out, size, k, ctx->iv, ctx->encrypt);
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| 76 | return 1;
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| 77 | }
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| 78 |
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| 79 | static int
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| 80 | aes_cleanup(EVP_CIPHER_CTX *ctx)
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| 81 | {
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| 82 | memset(ctx->cipher_data, 0, sizeof(AES_KEY));
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| 83 | return 1;
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| 84 | }
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| 85 |
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| 86 | /**
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| 87 | * The AES-128 cipher type (hcrypto)
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| 88 | *
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| 89 | * @return the AES-128 EVP_CIPHER pointer.
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| 90 | *
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| 91 | * @ingroup hcrypto_evp
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| 92 | */
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| 93 |
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| 94 | const EVP_CIPHER *
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| 95 | EVP_hcrypto_aes_128_cbc(void)
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| 96 | {
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| 97 | static const EVP_CIPHER aes_128_cbc = {
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| 98 | 0,
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| 99 | 16,
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| 100 | 16,
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| 101 | 16,
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| 102 | EVP_CIPH_CBC_MODE,
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| 103 | aes_init,
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| 104 | aes_do_cipher,
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| 105 | aes_cleanup,
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| 106 | sizeof(AES_KEY),
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| 107 | NULL,
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| 108 | NULL,
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| 109 | NULL,
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| 110 | NULL
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| 111 | };
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| 112 |
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| 113 | return &aes_128_cbc;
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| 114 | }
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| 115 |
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| 116 | /**
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| 117 | * The AES-192 cipher type (hcrypto)
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| 118 | *
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| 119 | * @return the AES-192 EVP_CIPHER pointer.
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| 120 | *
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| 121 | * @ingroup hcrypto_evp
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| 122 | */
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| 123 |
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| 124 | const EVP_CIPHER *
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| 125 | EVP_hcrypto_aes_192_cbc(void)
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| 126 | {
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| 127 | static const EVP_CIPHER aes_192_cbc = {
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| 128 | 0,
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| 129 | 16,
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| 130 | 24,
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| 131 | 16,
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| 132 | EVP_CIPH_CBC_MODE,
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| 133 | aes_init,
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| 134 | aes_do_cipher,
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| 135 | aes_cleanup,
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| 136 | sizeof(AES_KEY),
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| 137 | NULL,
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| 138 | NULL,
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| 139 | NULL,
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| 140 | NULL
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| 141 | };
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| 142 | return &aes_192_cbc;
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| 143 | }
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| 144 |
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| 145 | /**
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| 146 | * The AES-256 cipher type (hcrypto)
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| 147 | *
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| 148 | * @return the AES-256 EVP_CIPHER pointer.
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| 149 | *
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| 150 | * @ingroup hcrypto_evp
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| 151 | */
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| 152 |
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| 153 | const EVP_CIPHER *
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| 154 | EVP_hcrypto_aes_256_cbc(void)
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| 155 | {
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| 156 | static const EVP_CIPHER aes_256_cbc = {
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| 157 | 0,
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| 158 | 16,
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| 159 | 32,
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| 160 | 16,
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| 161 | EVP_CIPH_CBC_MODE,
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| 162 | aes_init,
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| 163 | aes_do_cipher,
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| 164 | aes_cleanup,
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| 165 | sizeof(AES_KEY),
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| 166 | NULL,
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| 167 | NULL,
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| 168 | NULL,
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| 169 | NULL
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| 170 | };
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| 171 | return &aes_256_cbc;
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| 172 | }
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