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Diffstat (limited to 'src/lib/libcrypto/rc4/rc4.c')
| -rw-r--r-- | src/lib/libcrypto/rc4/rc4.c | 283 |
1 files changed, 283 insertions, 0 deletions
diff --git a/src/lib/libcrypto/rc4/rc4.c b/src/lib/libcrypto/rc4/rc4.c new file mode 100644 index 0000000000..bbf7c3ae4e --- /dev/null +++ b/src/lib/libcrypto/rc4/rc4.c | |||
| @@ -0,0 +1,283 @@ | |||
| 1 | /* $OpenBSD: rc4.c,v 1.8 2024/03/27 12:54:42 jsing Exp $ */ | ||
| 2 | /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) | ||
| 3 | * All rights reserved. | ||
| 4 | * | ||
| 5 | * This package is an SSL implementation written | ||
| 6 | * by Eric Young (eay@cryptsoft.com). | ||
| 7 | * The implementation was written so as to conform with Netscapes SSL. | ||
| 8 | * | ||
| 9 | * This library is free for commercial and non-commercial use as long as | ||
| 10 | * the following conditions are aheared to. The following conditions | ||
| 11 | * apply to all code found in this distribution, be it the RC4, RSA, | ||
| 12 | * lhash, DES, etc., code; not just the SSL code. The SSL documentation | ||
| 13 | * included with this distribution is covered by the same copyright terms | ||
| 14 | * except that the holder is Tim Hudson (tjh@cryptsoft.com). | ||
| 15 | * | ||
| 16 | * Copyright remains Eric Young's, and as such any Copyright notices in | ||
| 17 | * the code are not to be removed. | ||
| 18 | * If this package is used in a product, Eric Young should be given attribution | ||
| 19 | * as the author of the parts of the library used. | ||
| 20 | * This can be in the form of a textual message at program startup or | ||
| 21 | * in documentation (online or textual) provided with the package. | ||
| 22 | * | ||
| 23 | * Redistribution and use in source and binary forms, with or without | ||
| 24 | * modification, are permitted provided that the following conditions | ||
| 25 | * are met: | ||
| 26 | * 1. Redistributions of source code must retain the copyright | ||
| 27 | * notice, this list of conditions and the following disclaimer. | ||
| 28 | * 2. Redistributions in binary form must reproduce the above copyright | ||
| 29 | * notice, this list of conditions and the following disclaimer in the | ||
| 30 | * documentation and/or other materials provided with the distribution. | ||
| 31 | * 3. All advertising materials mentioning features or use of this software | ||
| 32 | * must display the following acknowledgement: | ||
| 33 | * "This product includes cryptographic software written by | ||
| 34 | * Eric Young (eay@cryptsoft.com)" | ||
| 35 | * The word 'cryptographic' can be left out if the rouines from the library | ||
| 36 | * being used are not cryptographic related :-). | ||
| 37 | * 4. If you include any Windows specific code (or a derivative thereof) from | ||
| 38 | * the apps directory (application code) you must include an acknowledgement: | ||
| 39 | * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" | ||
| 40 | * | ||
| 41 | * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND | ||
| 42 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | ||
| 43 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | ||
| 44 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE | ||
| 45 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | ||
| 46 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | ||
| 47 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | ||
| 48 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | ||
| 49 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | ||
| 50 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | ||
| 51 | * SUCH DAMAGE. | ||
| 52 | * | ||
| 53 | * The licence and distribution terms for any publically available version or | ||
| 54 | * derivative of this code cannot be changed. i.e. this code cannot simply be | ||
| 55 | * copied and put under another distribution licence | ||
| 56 | * [including the GNU Public Licence.] | ||
| 57 | */ | ||
| 58 | |||
| 59 | #include <endian.h> | ||
| 60 | |||
| 61 | #include <openssl/rc4.h> | ||
| 62 | |||
| 63 | /* RC4 as implemented from a posting from | ||
| 64 | * Newsgroups: sci.crypt | ||
| 65 | * From: sterndark@netcom.com (David Sterndark) | ||
| 66 | * Subject: RC4 Algorithm revealed. | ||
| 67 | * Message-ID: <sternCvKL4B.Hyy@netcom.com> | ||
| 68 | * Date: Wed, 14 Sep 1994 06:35:31 GMT | ||
| 69 | */ | ||
| 70 | |||
| 71 | void | ||
| 72 | RC4(RC4_KEY *key, size_t len, const unsigned char *indata, | ||
| 73 | unsigned char *outdata) | ||
| 74 | { | ||
| 75 | RC4_INT *d; | ||
| 76 | RC4_INT x, y,tx, ty; | ||
| 77 | size_t i; | ||
| 78 | |||
| 79 | x = key->x; | ||
| 80 | y = key->y; | ||
| 81 | d = key->data; | ||
| 82 | |||
| 83 | #if defined(RC4_CHUNK) | ||
| 84 | /* | ||
| 85 | * The original reason for implementing this(*) was the fact that | ||
| 86 | * pre-21164a Alpha CPUs don't have byte load/store instructions | ||
| 87 | * and e.g. a byte store has to be done with 64-bit load, shift, | ||
| 88 | * and, or and finally 64-bit store. Peaking data and operating | ||
| 89 | * at natural word size made it possible to reduce amount of | ||
| 90 | * instructions as well as to perform early read-ahead without | ||
| 91 | * suffering from RAW (read-after-write) hazard. This resulted | ||
| 92 | * in ~40%(**) performance improvement on 21064 box with gcc. | ||
| 93 | * But it's not only Alpha users who win here:-) Thanks to the | ||
| 94 | * early-n-wide read-ahead this implementation also exhibits | ||
| 95 | * >40% speed-up on SPARC and 20-30% on 64-bit MIPS (depending | ||
| 96 | * on sizeof(RC4_INT)). | ||
| 97 | * | ||
| 98 | * (*) "this" means code which recognizes the case when input | ||
| 99 | * and output pointers appear to be aligned at natural CPU | ||
| 100 | * word boundary | ||
| 101 | * (**) i.e. according to 'apps/openssl speed rc4' benchmark, | ||
| 102 | * crypto/rc4/rc4speed.c exhibits almost 70% speed-up... | ||
| 103 | * | ||
| 104 | * Caveats. | ||
| 105 | * | ||
| 106 | * - RC4_CHUNK="unsigned long long" should be a #1 choice for | ||
| 107 | * UltraSPARC. Unfortunately gcc generates very slow code | ||
| 108 | * (2.5-3 times slower than one generated by Sun's WorkShop | ||
| 109 | * C) and therefore gcc (at least 2.95 and earlier) should | ||
| 110 | * always be told that RC4_CHUNK="unsigned long". | ||
| 111 | * | ||
| 112 | * <appro@fy.chalmers.se> | ||
| 113 | */ | ||
| 114 | |||
| 115 | # define RC4_STEP ( \ | ||
| 116 | x=(x+1) &0xff, \ | ||
| 117 | tx=d[x], \ | ||
| 118 | y=(tx+y)&0xff, \ | ||
| 119 | ty=d[y], \ | ||
| 120 | d[y]=tx, \ | ||
| 121 | d[x]=ty, \ | ||
| 122 | (RC4_CHUNK)d[(tx+ty)&0xff]\ | ||
| 123 | ) | ||
| 124 | |||
| 125 | if ((((size_t)indata & (sizeof(RC4_CHUNK) - 1)) | | ||
| 126 | ((size_t)outdata & (sizeof(RC4_CHUNK) - 1))) == 0 ) { | ||
| 127 | RC4_CHUNK ichunk, otp; | ||
| 128 | |||
| 129 | /* | ||
| 130 | * I reckon we can afford to implement both endian | ||
| 131 | * cases and to decide which way to take at run-time | ||
| 132 | * because the machine code appears to be very compact | ||
| 133 | * and redundant 1-2KB is perfectly tolerable (i.e. | ||
| 134 | * in case the compiler fails to eliminate it:-). By | ||
| 135 | * suggestion from Terrel Larson <terr@terralogic.net>. | ||
| 136 | * | ||
| 137 | * Special notes. | ||
| 138 | * | ||
| 139 | * - compilers (those I've tried) don't seem to have | ||
| 140 | * problems eliminating either the operators guarded | ||
| 141 | * by "if (sizeof(RC4_CHUNK)==8)" or the condition | ||
| 142 | * expressions themselves so I've got 'em to replace | ||
| 143 | * corresponding #ifdefs from the previous version; | ||
| 144 | * - I chose to let the redundant switch cases when | ||
| 145 | * sizeof(RC4_CHUNK)!=8 be (were also #ifdefed | ||
| 146 | * before); | ||
| 147 | * - in case you wonder "&(sizeof(RC4_CHUNK)*8-1)" in | ||
| 148 | * [LB]ESHFT guards against "shift is out of range" | ||
| 149 | * warnings when sizeof(RC4_CHUNK)!=8 | ||
| 150 | * | ||
| 151 | * <appro@fy.chalmers.se> | ||
| 152 | */ | ||
| 153 | #if BYTE_ORDER == BIG_ENDIAN | ||
| 154 | # define BESHFT(c) (((sizeof(RC4_CHUNK)-(c)-1)*8)&(sizeof(RC4_CHUNK)*8-1)) | ||
| 155 | for (; len & (0 - sizeof(RC4_CHUNK)); len -= sizeof(RC4_CHUNK)) { | ||
| 156 | ichunk = *(RC4_CHUNK *)indata; | ||
| 157 | otp = RC4_STEP << BESHFT(0); | ||
| 158 | otp |= RC4_STEP << BESHFT(1); | ||
| 159 | otp |= RC4_STEP << BESHFT(2); | ||
| 160 | otp |= RC4_STEP << BESHFT(3); | ||
| 161 | if (sizeof(RC4_CHUNK) == 8) { | ||
| 162 | otp |= RC4_STEP << BESHFT(4); | ||
| 163 | otp |= RC4_STEP << BESHFT(5); | ||
| 164 | otp |= RC4_STEP << BESHFT(6); | ||
| 165 | otp |= RC4_STEP << BESHFT(7); | ||
| 166 | } | ||
| 167 | *(RC4_CHUNK *)outdata = otp^ichunk; | ||
| 168 | indata += sizeof(RC4_CHUNK); | ||
| 169 | outdata += sizeof(RC4_CHUNK); | ||
| 170 | } | ||
| 171 | #else | ||
| 172 | # define LESHFT(c) (((c)*8)&(sizeof(RC4_CHUNK)*8-1)) | ||
| 173 | for (; len & (0 - sizeof(RC4_CHUNK)); len -= sizeof(RC4_CHUNK)) { | ||
| 174 | ichunk = *(RC4_CHUNK *)indata; | ||
| 175 | otp = RC4_STEP; | ||
| 176 | otp |= RC4_STEP << 8; | ||
| 177 | otp |= RC4_STEP << 16; | ||
| 178 | otp |= RC4_STEP << 24; | ||
| 179 | if (sizeof(RC4_CHUNK) == 8) { | ||
| 180 | otp |= RC4_STEP << LESHFT(4); | ||
| 181 | otp |= RC4_STEP << LESHFT(5); | ||
| 182 | otp |= RC4_STEP << LESHFT(6); | ||
| 183 | otp |= RC4_STEP << LESHFT(7); | ||
| 184 | } | ||
| 185 | *(RC4_CHUNK *)outdata = otp ^ ichunk; | ||
| 186 | indata += sizeof(RC4_CHUNK); | ||
| 187 | outdata += sizeof(RC4_CHUNK); | ||
| 188 | } | ||
| 189 | #endif | ||
| 190 | } | ||
| 191 | #endif | ||
| 192 | #define LOOP(in,out) \ | ||
| 193 | x=((x+1)&0xff); \ | ||
| 194 | tx=d[x]; \ | ||
| 195 | y=(tx+y)&0xff; \ | ||
| 196 | d[x]=ty=d[y]; \ | ||
| 197 | d[y]=tx; \ | ||
| 198 | (out) = d[(tx+ty)&0xff]^ (in); | ||
| 199 | |||
| 200 | #ifndef RC4_INDEX | ||
| 201 | #define RC4_LOOP(a,b,i) LOOP(*((a)++),*((b)++)) | ||
| 202 | #else | ||
| 203 | #define RC4_LOOP(a,b,i) LOOP(a[i],b[i]) | ||
| 204 | #endif | ||
| 205 | |||
| 206 | i = len >> 3; | ||
| 207 | if (i) { | ||
| 208 | for (;;) { | ||
| 209 | RC4_LOOP(indata, outdata, 0); | ||
| 210 | RC4_LOOP(indata, outdata, 1); | ||
| 211 | RC4_LOOP(indata, outdata, 2); | ||
| 212 | RC4_LOOP(indata, outdata, 3); | ||
| 213 | RC4_LOOP(indata, outdata, 4); | ||
| 214 | RC4_LOOP(indata, outdata, 5); | ||
| 215 | RC4_LOOP(indata, outdata, 6); | ||
| 216 | RC4_LOOP(indata, outdata, 7); | ||
| 217 | #ifdef RC4_INDEX | ||
| 218 | indata += 8; | ||
| 219 | outdata += 8; | ||
| 220 | #endif | ||
| 221 | if (--i == 0) | ||
| 222 | break; | ||
| 223 | } | ||
| 224 | } | ||
| 225 | i = len&0x07; | ||
| 226 | if (i) { | ||
| 227 | for (;;) { | ||
| 228 | RC4_LOOP(indata, outdata, 0); | ||
| 229 | if (--i == 0) | ||
| 230 | break; | ||
| 231 | RC4_LOOP(indata, outdata, 1); | ||
| 232 | if (--i == 0) | ||
| 233 | break; | ||
| 234 | RC4_LOOP(indata, outdata, 2); | ||
| 235 | if (--i == 0) | ||
| 236 | break; | ||
| 237 | RC4_LOOP(indata, outdata, 3); | ||
| 238 | if (--i == 0) | ||
| 239 | break; | ||
| 240 | RC4_LOOP(indata, outdata, 4); | ||
| 241 | if (--i == 0) | ||
| 242 | break; | ||
| 243 | RC4_LOOP(indata, outdata, 5); | ||
| 244 | if (--i == 0) | ||
| 245 | break; | ||
| 246 | RC4_LOOP(indata, outdata, 6); | ||
| 247 | if (--i == 0) | ||
| 248 | break; | ||
| 249 | } | ||
| 250 | } | ||
| 251 | key->x = x; | ||
| 252 | key->y = y; | ||
| 253 | } | ||
| 254 | |||
| 255 | void | ||
| 256 | RC4_set_key(RC4_KEY *key, int len, const unsigned char *data) | ||
| 257 | { | ||
| 258 | RC4_INT tmp; | ||
| 259 | int id1, id2; | ||
| 260 | RC4_INT *d; | ||
| 261 | unsigned int i; | ||
| 262 | |||
| 263 | d = &(key->data[0]); | ||
| 264 | key->x = 0; | ||
| 265 | key->y = 0; | ||
| 266 | id1 = id2 = 0; | ||
| 267 | |||
| 268 | #define SK_LOOP(d,n) { \ | ||
| 269 | tmp=d[(n)]; \ | ||
| 270 | id2 = (data[id1] + tmp + id2) & 0xff; \ | ||
| 271 | if (++id1 == len) id1=0; \ | ||
| 272 | d[(n)]=d[id2]; \ | ||
| 273 | d[id2]=tmp; } | ||
| 274 | |||
| 275 | for (i = 0; i < 256; i++) | ||
| 276 | d[i] = i; | ||
| 277 | for (i = 0; i < 256; i += 4) { | ||
| 278 | SK_LOOP(d, i + 0); | ||
| 279 | SK_LOOP(d, i + 1); | ||
| 280 | SK_LOOP(d, i + 2); | ||
| 281 | SK_LOOP(d, i + 3); | ||
| 282 | } | ||
| 283 | } | ||
