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1 /* crypto/aes/aes_ofb.c -*- mode:C; c-file-style: "eay" -*- */ | 1 /* crypto/aes/aes_ofb.c -*- mode:C; c-file-style: "eay" -*- */ |
2 /* ==================================================================== | 2 /* ==================================================================== |
3 * Copyright (c) 1998-2002 The OpenSSL Project. All rights reserved. | 3 * Copyright (c) 2002-2006 The OpenSSL Project. All rights reserved. |
4 * | 4 * |
5 * Redistribution and use in source and binary forms, with or without | 5 * Redistribution and use in source and binary forms, with or without |
6 * modification, are permitted provided that the following conditions | 6 * modification, are permitted provided that the following conditions |
7 * are met: | 7 * are met: |
8 * | 8 * |
9 * 1. Redistributions of source code must retain the above copyright | 9 * 1. Redistributions of source code must retain the above copyright |
10 * notice, this list of conditions and the following disclaimer. | 10 * notice, this list of conditions and the following disclaimer. |
11 * | 11 * |
12 * 2. Redistributions in binary form must reproduce the above copyright | 12 * 2. Redistributions in binary form must reproduce the above copyright |
13 * notice, this list of conditions and the following disclaimer in | 13 * notice, this list of conditions and the following disclaimer in |
(...skipping 27 matching lines...) Expand all Loading... |
41 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | 41 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
42 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | 42 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
43 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | 43 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
44 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | 44 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
45 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | 45 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
46 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED | 46 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED |
47 * OF THE POSSIBILITY OF SUCH DAMAGE. | 47 * OF THE POSSIBILITY OF SUCH DAMAGE. |
48 * ==================================================================== | 48 * ==================================================================== |
49 * | 49 * |
50 */ | 50 */ |
51 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) | |
52 * All rights reserved. | |
53 * | |
54 * This package is an SSL implementation written | |
55 * by Eric Young (eay@cryptsoft.com). | |
56 * The implementation was written so as to conform with Netscapes SSL. | |
57 * | |
58 * This library is free for commercial and non-commercial use as long as | |
59 * the following conditions are aheared to. The following conditions | |
60 * apply to all code found in this distribution, be it the RC4, RSA, | |
61 * lhash, DES, etc., code; not just the SSL code. The SSL documentation | |
62 * included with this distribution is covered by the same copyright terms | |
63 * except that the holder is Tim Hudson (tjh@cryptsoft.com). | |
64 * | |
65 * Copyright remains Eric Young's, and as such any Copyright notices in | |
66 * the code are not to be removed. | |
67 * If this package is used in a product, Eric Young should be given attribution | |
68 * as the author of the parts of the library used. | |
69 * This can be in the form of a textual message at program startup or | |
70 * in documentation (online or textual) provided with the package. | |
71 * | |
72 * Redistribution and use in source and binary forms, with or without | |
73 * modification, are permitted provided that the following conditions | |
74 * are met: | |
75 * 1. Redistributions of source code must retain the copyright | |
76 * notice, this list of conditions and the following disclaimer. | |
77 * 2. Redistributions in binary form must reproduce the above copyright | |
78 * notice, this list of conditions and the following disclaimer in the | |
79 * documentation and/or other materials provided with the distribution. | |
80 * 3. All advertising materials mentioning features or use of this software | |
81 * must display the following acknowledgement: | |
82 * "This product includes cryptographic software written by | |
83 * Eric Young (eay@cryptsoft.com)" | |
84 * The word 'cryptographic' can be left out if the rouines from the library | |
85 * being used are not cryptographic related :-). | |
86 * 4. If you include any Windows specific code (or a derivative thereof) from | |
87 * the apps directory (application code) you must include an acknowledgement: | |
88 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" | |
89 * | |
90 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND | |
91 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
92 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
93 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE | |
94 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
95 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
96 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
97 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
98 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
99 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
100 * SUCH DAMAGE. | |
101 * | |
102 * The licence and distribution terms for any publically available version or | |
103 * derivative of this code cannot be changed. i.e. this code cannot simply be | |
104 * copied and put under another distribution licence | |
105 * [including the GNU Public Licence.] | |
106 */ | |
107 | |
108 #ifndef AES_DEBUG | |
109 # ifndef NDEBUG | |
110 # define NDEBUG | |
111 # endif | |
112 #endif | |
113 #include <assert.h> | |
114 | 51 |
115 #include <openssl/aes.h> | 52 #include <openssl/aes.h> |
116 #include "aes_locl.h" | 53 #include <openssl/modes.h> |
117 | 54 |
118 /* The input and output encrypted as though 128bit ofb mode is being | |
119 * used. The extra state information to record how much of the | |
120 * 128bit block we have used is contained in *num; | |
121 */ | |
122 void AES_ofb128_encrypt(const unsigned char *in, unsigned char *out, | 55 void AES_ofb128_encrypt(const unsigned char *in, unsigned char *out, |
123 » const unsigned long length, const AES_KEY *key, | 56 » size_t length, const AES_KEY *key, |
124 » unsigned char *ivec, int *num) { | 57 » unsigned char *ivec, int *num) |
125 | 58 { |
126 » unsigned int n; | 59 » CRYPTO_ofb128_encrypt(in,out,length,key,ivec,num,(block128_f)AES_encrypt
); |
127 » unsigned long l=length; | |
128 | |
129 » assert(in && out && key && ivec && num); | |
130 | |
131 » n = *num; | |
132 | |
133 » while (l--) { | |
134 » » if (n == 0) { | |
135 » » » AES_encrypt(ivec, ivec, key); | |
136 » » } | |
137 » » *(out++) = *(in++) ^ ivec[n]; | |
138 » » n = (n+1) % AES_BLOCK_SIZE; | |
139 » } | |
140 | |
141 » *num=n; | |
142 } | 60 } |
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