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Diffstat (limited to 'src/lib/libcrypto/aes/aes_cfb.c')
| -rw-r--r-- | src/lib/libcrypto/aes/aes_cfb.c | 225 |
1 files changed, 225 insertions, 0 deletions
diff --git a/src/lib/libcrypto/aes/aes_cfb.c b/src/lib/libcrypto/aes/aes_cfb.c new file mode 100644 index 0000000000..49f0411010 --- /dev/null +++ b/src/lib/libcrypto/aes/aes_cfb.c | |||
| @@ -0,0 +1,225 @@ | |||
| 1 | /* crypto/aes/aes_cfb.c -*- mode:C; c-file-style: "eay" -*- */ | ||
| 2 | /* ==================================================================== | ||
| 3 | * Copyright (c) 1998-2002 The OpenSSL Project. All rights reserved. | ||
| 4 | * | ||
| 5 | * Redistribution and use in source and binary forms, with or without | ||
| 6 | * modification, are permitted provided that the following conditions | ||
| 7 | * are met: | ||
| 8 | * | ||
| 9 | * 1. Redistributions of source code must retain the above copyright | ||
| 10 | * notice, this list of conditions and the following disclaimer. | ||
| 11 | * | ||
| 12 | * 2. Redistributions in binary form must reproduce the above copyright | ||
| 13 | * notice, this list of conditions and the following disclaimer in | ||
| 14 | * the documentation and/or other materials provided with the | ||
| 15 | * distribution. | ||
| 16 | * | ||
| 17 | * 3. All advertising materials mentioning features or use of this | ||
| 18 | * software must display the following acknowledgment: | ||
| 19 | * "This product includes software developed by the OpenSSL Project | ||
| 20 | * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" | ||
| 21 | * | ||
| 22 | * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to | ||
| 23 | * endorse or promote products derived from this software without | ||
| 24 | * prior written permission. For written permission, please contact | ||
| 25 | * openssl-core@openssl.org. | ||
| 26 | * | ||
| 27 | * 5. Products derived from this software may not be called "OpenSSL" | ||
| 28 | * nor may "OpenSSL" appear in their names without prior written | ||
| 29 | * permission of the OpenSSL Project. | ||
| 30 | * | ||
| 31 | * 6. Redistributions of any form whatsoever must retain the following | ||
| 32 | * acknowledgment: | ||
| 33 | * "This product includes software developed by the OpenSSL Project | ||
| 34 | * for use in the OpenSSL Toolkit (http://www.openssl.org/)" | ||
| 35 | * | ||
| 36 | * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY | ||
| 37 | * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | ||
| 38 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | ||
| 39 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR | ||
| 40 | * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | ||
| 41 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | ||
| 42 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | ||
| 43 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | ||
| 44 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | ||
| 45 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | ||
| 46 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED | ||
| 47 | * OF THE POSSIBILITY OF SUCH DAMAGE. | ||
| 48 | * ==================================================================== | ||
| 49 | * | ||
| 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 | |||
| 115 | #include <openssl/aes.h> | ||
| 116 | #include "aes_locl.h" | ||
| 117 | #include "e_os.h" | ||
| 118 | |||
| 119 | /* The input and output encrypted as though 128bit cfb mode is being | ||
| 120 | * used. The extra state information to record how much of the | ||
| 121 | * 128bit block we have used is contained in *num; | ||
| 122 | */ | ||
| 123 | |||
| 124 | void AES_cfb128_encrypt(const unsigned char *in, unsigned char *out, | ||
| 125 | const unsigned long length, const AES_KEY *key, | ||
| 126 | unsigned char *ivec, int *num, const int enc) { | ||
| 127 | |||
| 128 | unsigned int n; | ||
| 129 | unsigned long l = length; | ||
| 130 | unsigned char c; | ||
| 131 | |||
| 132 | assert(in && out && key && ivec && num); | ||
| 133 | |||
| 134 | n = *num; | ||
| 135 | |||
| 136 | if (enc) { | ||
| 137 | while (l--) { | ||
| 138 | if (n == 0) { | ||
| 139 | AES_encrypt(ivec, ivec, key); | ||
| 140 | } | ||
| 141 | ivec[n] = *(out++) = *(in++) ^ ivec[n]; | ||
| 142 | n = (n+1) % AES_BLOCK_SIZE; | ||
| 143 | } | ||
| 144 | } else { | ||
| 145 | while (l--) { | ||
| 146 | if (n == 0) { | ||
| 147 | AES_encrypt(ivec, ivec, key); | ||
| 148 | } | ||
| 149 | c = *(in); | ||
| 150 | *(out++) = *(in++) ^ ivec[n]; | ||
| 151 | ivec[n] = c; | ||
| 152 | n = (n+1) % AES_BLOCK_SIZE; | ||
| 153 | } | ||
| 154 | } | ||
| 155 | |||
| 156 | *num=n; | ||
| 157 | } | ||
| 158 | |||
| 159 | /* This expects a single block of size nbits for both in and out. Note that | ||
| 160 | it corrupts any extra bits in the last byte of out */ | ||
| 161 | void AES_cfbr_encrypt_block(const unsigned char *in,unsigned char *out, | ||
| 162 | const int nbits,const AES_KEY *key, | ||
| 163 | unsigned char *ivec,const int enc) | ||
| 164 | { | ||
| 165 | int n,rem,num; | ||
| 166 | unsigned char ovec[AES_BLOCK_SIZE*2]; | ||
| 167 | |||
| 168 | if (nbits<=0 || nbits>128) return; | ||
| 169 | |||
| 170 | /* fill in the first half of the new IV with the current IV */ | ||
| 171 | memcpy(ovec,ivec,AES_BLOCK_SIZE); | ||
| 172 | /* construct the new IV */ | ||
| 173 | AES_encrypt(ivec,ivec,key); | ||
| 174 | num = (nbits+7)/8; | ||
| 175 | if (enc) /* encrypt the input */ | ||
| 176 | for(n=0 ; n < num ; ++n) | ||
| 177 | out[n] = (ovec[AES_BLOCK_SIZE+n] = in[n] ^ ivec[n]); | ||
| 178 | else /* decrypt the input */ | ||
| 179 | for(n=0 ; n < num ; ++n) | ||
| 180 | out[n] = (ovec[AES_BLOCK_SIZE+n] = in[n]) ^ ivec[n]; | ||
| 181 | /* shift ovec left... */ | ||
| 182 | rem = nbits%8; | ||
| 183 | num = nbits/8; | ||
| 184 | if(rem==0) | ||
| 185 | memcpy(ivec,ovec+num,AES_BLOCK_SIZE); | ||
| 186 | else | ||
| 187 | for(n=0 ; n < AES_BLOCK_SIZE ; ++n) | ||
| 188 | ivec[n] = ovec[n+num]<<rem | ovec[n+num+1]>>(8-rem); | ||
| 189 | |||
| 190 | /* it is not necessary to cleanse ovec, since the IV is not secret */ | ||
| 191 | } | ||
| 192 | |||
| 193 | /* N.B. This expects the input to be packed, MS bit first */ | ||
| 194 | void AES_cfb1_encrypt(const unsigned char *in, unsigned char *out, | ||
| 195 | const unsigned long length, const AES_KEY *key, | ||
| 196 | unsigned char *ivec, int *num, const int enc) | ||
| 197 | { | ||
| 198 | unsigned int n; | ||
| 199 | unsigned char c[1],d[1]; | ||
| 200 | |||
| 201 | assert(in && out && key && ivec && num); | ||
| 202 | assert(*num == 0); | ||
| 203 | |||
| 204 | memset(out,0,(length+7)/8); | ||
| 205 | for(n=0 ; n < length ; ++n) | ||
| 206 | { | ||
| 207 | c[0]=(in[n/8]&(1 << (7-n%8))) ? 0x80 : 0; | ||
| 208 | AES_cfbr_encrypt_block(c,d,1,key,ivec,enc); | ||
| 209 | out[n/8]=(out[n/8]&~(1 << (7-n%8)))|((d[0]&0x80) >> (n%8)); | ||
| 210 | } | ||
| 211 | } | ||
| 212 | |||
| 213 | void AES_cfb8_encrypt(const unsigned char *in, unsigned char *out, | ||
| 214 | const unsigned long length, const AES_KEY *key, | ||
| 215 | unsigned char *ivec, int *num, const int enc) | ||
| 216 | { | ||
| 217 | unsigned int n; | ||
| 218 | |||
| 219 | assert(in && out && key && ivec && num); | ||
| 220 | assert(*num == 0); | ||
| 221 | |||
| 222 | for(n=0 ; n < length ; ++n) | ||
| 223 | AES_cfbr_encrypt_block(&in[n],&out[n],8,key,ivec,enc); | ||
| 224 | } | ||
| 225 | |||
