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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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