2 * Copyright (c) 2003 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
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37 RCSID("$Id: aes.c 15495 2005-06-18 22:47:33Z lha $");
41 #include <krb5-types.h>
46 #include "rijndael-alg-fst.h"
50 AES_set_encrypt_key(const unsigned char *userkey, const int bits, AES_KEY *key)
52 key->rounds = rijndaelKeySetupEnc(key->key, userkey, bits);
59 AES_set_decrypt_key(const unsigned char *userkey, const int bits, AES_KEY *key)
61 key->rounds = rijndaelKeySetupDec(key->key, userkey, bits);
68 AES_encrypt(const unsigned char *in, unsigned char *out, const AES_KEY *key)
70 rijndaelEncrypt(key->key, key->rounds, in, out);
74 AES_decrypt(const unsigned char *in, unsigned char *out, const AES_KEY *key)
76 rijndaelDecrypt(key->key, key->rounds, in, out);
80 AES_cbc_encrypt(const unsigned char *in, unsigned char *out,
81 unsigned long size, const AES_KEY *key,
82 unsigned char *iv, int forward_encrypt)
84 unsigned char tmp[AES_BLOCK_SIZE];
87 if (forward_encrypt) {
88 while (size >= AES_BLOCK_SIZE) {
89 for (i = 0; i < AES_BLOCK_SIZE; i++)
90 tmp[i] = in[i] ^ iv[i];
91 AES_encrypt(tmp, out, key);
92 memcpy(iv, out, AES_BLOCK_SIZE);
93 size -= AES_BLOCK_SIZE;
95 out += AES_BLOCK_SIZE;
98 for (i = 0; i < size; i++)
99 tmp[i] = in[i] ^ iv[i];
100 for (i = size; i < AES_BLOCK_SIZE; i++)
102 AES_encrypt(tmp, out, key);
103 memcpy(iv, out, AES_BLOCK_SIZE);
106 while (size >= AES_BLOCK_SIZE) {
107 memcpy(tmp, in, AES_BLOCK_SIZE);
108 AES_decrypt(tmp, out, key);
109 for (i = 0; i < AES_BLOCK_SIZE; i++)
111 memcpy(iv, tmp, AES_BLOCK_SIZE);
112 size -= AES_BLOCK_SIZE;
113 in += AES_BLOCK_SIZE;
114 out += AES_BLOCK_SIZE;
117 memcpy(tmp, in, AES_BLOCK_SIZE);
118 AES_decrypt(tmp, out, key);
119 for (i = 0; i < size; i++)
121 memcpy(iv, tmp, AES_BLOCK_SIZE);