Rich Felker | a02bf5f | 2012-08-10 00:20:00 -0400 | [diff] [blame] | 1 | /* Modified by Rich Felker in for inclusion in musl libc, based on |
| 2 | * Solar Designer's second size-optimized version sent to the musl |
| 3 | * mailing list. */ |
| 4 | |
| 5 | /* |
| 6 | * The crypt_blowfish homepage is: |
| 7 | * |
| 8 | * http://www.openwall.com/crypt/ |
| 9 | * |
| 10 | * This code comes from John the Ripper password cracker, with reentrant |
| 11 | * and crypt(3) interfaces added, but optimizations specific to password |
| 12 | * cracking removed. |
| 13 | * |
| 14 | * Written by Solar Designer <solar at openwall.com> in 1998-2012. |
| 15 | * No copyright is claimed, and the software is hereby placed in the public |
| 16 | * domain. In case this attempt to disclaim copyright and place the software |
| 17 | * in the public domain is deemed null and void, then the software is |
| 18 | * Copyright (c) 1998-2012 Solar Designer and it is hereby released to the |
| 19 | * general public under the following terms: |
| 20 | * |
| 21 | * Redistribution and use in source and binary forms, with or without |
| 22 | * modification, are permitted. |
| 23 | * |
| 24 | * There's ABSOLUTELY NO WARRANTY, express or implied. |
| 25 | * |
| 26 | * It is my intent that you should be able to use this on your system, |
| 27 | * as part of a software package, or anywhere else to improve security, |
| 28 | * ensure compatibility, or for any other purpose. I would appreciate |
| 29 | * it if you give credit where it is due and keep your modifications in |
| 30 | * the public domain as well, but I don't require that in order to let |
| 31 | * you place this code and any modifications you make under a license |
| 32 | * of your choice. |
| 33 | * |
| 34 | * This implementation is mostly compatible with OpenBSD's bcrypt.c (prefix |
| 35 | * "$2a$") by Niels Provos <provos at citi.umich.edu>, and uses some of his |
| 36 | * ideas. The password hashing algorithm was designed by David Mazieres |
| 37 | * <dm at lcs.mit.edu>. For more information on the level of compatibility, |
| 38 | * please refer to the comments in BF_set_key() below and to the included |
| 39 | * crypt(3) man page. |
| 40 | * |
| 41 | * There's a paper on the algorithm that explains its design decisions: |
| 42 | * |
| 43 | * http://www.usenix.org/events/usenix99/provos.html |
| 44 | * |
| 45 | * Some of the tricks in BF_ROUND might be inspired by Eric Young's |
| 46 | * Blowfish library (I can't be sure if I would think of something if I |
| 47 | * hadn't seen his code). |
| 48 | */ |
| 49 | |
| 50 | #include <string.h> |
| 51 | #include <stdint.h> |
| 52 | |
| 53 | typedef uint32_t BF_word; |
| 54 | typedef int32_t BF_word_signed; |
| 55 | |
| 56 | /* Number of Blowfish rounds, this is also hardcoded into a few places */ |
| 57 | #define BF_N 16 |
| 58 | |
| 59 | typedef BF_word BF_key[BF_N + 2]; |
| 60 | |
| 61 | typedef union { |
| 62 | struct { |
| 63 | BF_key P; |
| 64 | BF_word S[4][0x100]; |
| 65 | } s; |
| 66 | BF_word PS[BF_N + 2 + 4 * 0x100]; |
| 67 | } BF_ctx; |
| 68 | |
| 69 | /* |
| 70 | * Magic IV for 64 Blowfish encryptions that we do at the end. |
| 71 | * The string is "OrpheanBeholderScryDoubt" on big-endian. |
| 72 | */ |
| 73 | static const BF_word BF_magic_w[6] = { |
| 74 | 0x4F727068, 0x65616E42, 0x65686F6C, |
| 75 | 0x64657253, 0x63727944, 0x6F756274 |
| 76 | }; |
| 77 | |
| 78 | /* |
| 79 | * P-box and S-box tables initialized with digits of Pi. |
| 80 | */ |
| 81 | static const BF_ctx BF_init_state = {{ |
| 82 | { |
| 83 | 0x243f6a88, 0x85a308d3, 0x13198a2e, 0x03707344, |
| 84 | 0xa4093822, 0x299f31d0, 0x082efa98, 0xec4e6c89, |
| 85 | 0x452821e6, 0x38d01377, 0xbe5466cf, 0x34e90c6c, |
| 86 | 0xc0ac29b7, 0xc97c50dd, 0x3f84d5b5, 0xb5470917, |
| 87 | 0x9216d5d9, 0x8979fb1b |
| 88 | }, { |
| 89 | { |
| 90 | 0xd1310ba6, 0x98dfb5ac, 0x2ffd72db, 0xd01adfb7, |
| 91 | 0xb8e1afed, 0x6a267e96, 0xba7c9045, 0xf12c7f99, |
| 92 | 0x24a19947, 0xb3916cf7, 0x0801f2e2, 0x858efc16, |
| 93 | 0x636920d8, 0x71574e69, 0xa458fea3, 0xf4933d7e, |
| 94 | 0x0d95748f, 0x728eb658, 0x718bcd58, 0x82154aee, |
| 95 | 0x7b54a41d, 0xc25a59b5, 0x9c30d539, 0x2af26013, |
| 96 | 0xc5d1b023, 0x286085f0, 0xca417918, 0xb8db38ef, |
| 97 | 0x8e79dcb0, 0x603a180e, 0x6c9e0e8b, 0xb01e8a3e, |
| 98 | 0xd71577c1, 0xbd314b27, 0x78af2fda, 0x55605c60, |
| 99 | 0xe65525f3, 0xaa55ab94, 0x57489862, 0x63e81440, |
| 100 | 0x55ca396a, 0x2aab10b6, 0xb4cc5c34, 0x1141e8ce, |
| 101 | 0xa15486af, 0x7c72e993, 0xb3ee1411, 0x636fbc2a, |
| 102 | 0x2ba9c55d, 0x741831f6, 0xce5c3e16, 0x9b87931e, |
| 103 | 0xafd6ba33, 0x6c24cf5c, 0x7a325381, 0x28958677, |
| 104 | 0x3b8f4898, 0x6b4bb9af, 0xc4bfe81b, 0x66282193, |
| 105 | 0x61d809cc, 0xfb21a991, 0x487cac60, 0x5dec8032, |
| 106 | 0xef845d5d, 0xe98575b1, 0xdc262302, 0xeb651b88, |
| 107 | 0x23893e81, 0xd396acc5, 0x0f6d6ff3, 0x83f44239, |
| 108 | 0x2e0b4482, 0xa4842004, 0x69c8f04a, 0x9e1f9b5e, |
| 109 | 0x21c66842, 0xf6e96c9a, 0x670c9c61, 0xabd388f0, |
| 110 | 0x6a51a0d2, 0xd8542f68, 0x960fa728, 0xab5133a3, |
| 111 | 0x6eef0b6c, 0x137a3be4, 0xba3bf050, 0x7efb2a98, |
| 112 | 0xa1f1651d, 0x39af0176, 0x66ca593e, 0x82430e88, |
| 113 | 0x8cee8619, 0x456f9fb4, 0x7d84a5c3, 0x3b8b5ebe, |
| 114 | 0xe06f75d8, 0x85c12073, 0x401a449f, 0x56c16aa6, |
| 115 | 0x4ed3aa62, 0x363f7706, 0x1bfedf72, 0x429b023d, |
| 116 | 0x37d0d724, 0xd00a1248, 0xdb0fead3, 0x49f1c09b, |
| 117 | 0x075372c9, 0x80991b7b, 0x25d479d8, 0xf6e8def7, |
| 118 | 0xe3fe501a, 0xb6794c3b, 0x976ce0bd, 0x04c006ba, |
| 119 | 0xc1a94fb6, 0x409f60c4, 0x5e5c9ec2, 0x196a2463, |
| 120 | 0x68fb6faf, 0x3e6c53b5, 0x1339b2eb, 0x3b52ec6f, |
| 121 | 0x6dfc511f, 0x9b30952c, 0xcc814544, 0xaf5ebd09, |
| 122 | 0xbee3d004, 0xde334afd, 0x660f2807, 0x192e4bb3, |
| 123 | 0xc0cba857, 0x45c8740f, 0xd20b5f39, 0xb9d3fbdb, |
| 124 | 0x5579c0bd, 0x1a60320a, 0xd6a100c6, 0x402c7279, |
| 125 | 0x679f25fe, 0xfb1fa3cc, 0x8ea5e9f8, 0xdb3222f8, |
| 126 | 0x3c7516df, 0xfd616b15, 0x2f501ec8, 0xad0552ab, |
| 127 | 0x323db5fa, 0xfd238760, 0x53317b48, 0x3e00df82, |
| 128 | 0x9e5c57bb, 0xca6f8ca0, 0x1a87562e, 0xdf1769db, |
| 129 | 0xd542a8f6, 0x287effc3, 0xac6732c6, 0x8c4f5573, |
| 130 | 0x695b27b0, 0xbbca58c8, 0xe1ffa35d, 0xb8f011a0, |
| 131 | 0x10fa3d98, 0xfd2183b8, 0x4afcb56c, 0x2dd1d35b, |
| 132 | 0x9a53e479, 0xb6f84565, 0xd28e49bc, 0x4bfb9790, |
| 133 | 0xe1ddf2da, 0xa4cb7e33, 0x62fb1341, 0xcee4c6e8, |
| 134 | 0xef20cada, 0x36774c01, 0xd07e9efe, 0x2bf11fb4, |
| 135 | 0x95dbda4d, 0xae909198, 0xeaad8e71, 0x6b93d5a0, |
| 136 | 0xd08ed1d0, 0xafc725e0, 0x8e3c5b2f, 0x8e7594b7, |
| 137 | 0x8ff6e2fb, 0xf2122b64, 0x8888b812, 0x900df01c, |
| 138 | 0x4fad5ea0, 0x688fc31c, 0xd1cff191, 0xb3a8c1ad, |
| 139 | 0x2f2f2218, 0xbe0e1777, 0xea752dfe, 0x8b021fa1, |
| 140 | 0xe5a0cc0f, 0xb56f74e8, 0x18acf3d6, 0xce89e299, |
| 141 | 0xb4a84fe0, 0xfd13e0b7, 0x7cc43b81, 0xd2ada8d9, |
| 142 | 0x165fa266, 0x80957705, 0x93cc7314, 0x211a1477, |
| 143 | 0xe6ad2065, 0x77b5fa86, 0xc75442f5, 0xfb9d35cf, |
| 144 | 0xebcdaf0c, 0x7b3e89a0, 0xd6411bd3, 0xae1e7e49, |
| 145 | 0x00250e2d, 0x2071b35e, 0x226800bb, 0x57b8e0af, |
| 146 | 0x2464369b, 0xf009b91e, 0x5563911d, 0x59dfa6aa, |
| 147 | 0x78c14389, 0xd95a537f, 0x207d5ba2, 0x02e5b9c5, |
| 148 | 0x83260376, 0x6295cfa9, 0x11c81968, 0x4e734a41, |
| 149 | 0xb3472dca, 0x7b14a94a, 0x1b510052, 0x9a532915, |
| 150 | 0xd60f573f, 0xbc9bc6e4, 0x2b60a476, 0x81e67400, |
| 151 | 0x08ba6fb5, 0x571be91f, 0xf296ec6b, 0x2a0dd915, |
| 152 | 0xb6636521, 0xe7b9f9b6, 0xff34052e, 0xc5855664, |
| 153 | 0x53b02d5d, 0xa99f8fa1, 0x08ba4799, 0x6e85076a |
| 154 | }, { |
| 155 | 0x4b7a70e9, 0xb5b32944, 0xdb75092e, 0xc4192623, |
| 156 | 0xad6ea6b0, 0x49a7df7d, 0x9cee60b8, 0x8fedb266, |
| 157 | 0xecaa8c71, 0x699a17ff, 0x5664526c, 0xc2b19ee1, |
| 158 | 0x193602a5, 0x75094c29, 0xa0591340, 0xe4183a3e, |
| 159 | 0x3f54989a, 0x5b429d65, 0x6b8fe4d6, 0x99f73fd6, |
| 160 | 0xa1d29c07, 0xefe830f5, 0x4d2d38e6, 0xf0255dc1, |
| 161 | 0x4cdd2086, 0x8470eb26, 0x6382e9c6, 0x021ecc5e, |
| 162 | 0x09686b3f, 0x3ebaefc9, 0x3c971814, 0x6b6a70a1, |
| 163 | 0x687f3584, 0x52a0e286, 0xb79c5305, 0xaa500737, |
| 164 | 0x3e07841c, 0x7fdeae5c, 0x8e7d44ec, 0x5716f2b8, |
| 165 | 0xb03ada37, 0xf0500c0d, 0xf01c1f04, 0x0200b3ff, |
| 166 | 0xae0cf51a, 0x3cb574b2, 0x25837a58, 0xdc0921bd, |
| 167 | 0xd19113f9, 0x7ca92ff6, 0x94324773, 0x22f54701, |
| 168 | 0x3ae5e581, 0x37c2dadc, 0xc8b57634, 0x9af3dda7, |
| 169 | 0xa9446146, 0x0fd0030e, 0xecc8c73e, 0xa4751e41, |
| 170 | 0xe238cd99, 0x3bea0e2f, 0x3280bba1, 0x183eb331, |
| 171 | 0x4e548b38, 0x4f6db908, 0x6f420d03, 0xf60a04bf, |
| 172 | 0x2cb81290, 0x24977c79, 0x5679b072, 0xbcaf89af, |
| 173 | 0xde9a771f, 0xd9930810, 0xb38bae12, 0xdccf3f2e, |
| 174 | 0x5512721f, 0x2e6b7124, 0x501adde6, 0x9f84cd87, |
| 175 | 0x7a584718, 0x7408da17, 0xbc9f9abc, 0xe94b7d8c, |
| 176 | 0xec7aec3a, 0xdb851dfa, 0x63094366, 0xc464c3d2, |
| 177 | 0xef1c1847, 0x3215d908, 0xdd433b37, 0x24c2ba16, |
| 178 | 0x12a14d43, 0x2a65c451, 0x50940002, 0x133ae4dd, |
| 179 | 0x71dff89e, 0x10314e55, 0x81ac77d6, 0x5f11199b, |
| 180 | 0x043556f1, 0xd7a3c76b, 0x3c11183b, 0x5924a509, |
| 181 | 0xf28fe6ed, 0x97f1fbfa, 0x9ebabf2c, 0x1e153c6e, |
| 182 | 0x86e34570, 0xeae96fb1, 0x860e5e0a, 0x5a3e2ab3, |
| 183 | 0x771fe71c, 0x4e3d06fa, 0x2965dcb9, 0x99e71d0f, |
| 184 | 0x803e89d6, 0x5266c825, 0x2e4cc978, 0x9c10b36a, |
| 185 | 0xc6150eba, 0x94e2ea78, 0xa5fc3c53, 0x1e0a2df4, |
| 186 | 0xf2f74ea7, 0x361d2b3d, 0x1939260f, 0x19c27960, |
| 187 | 0x5223a708, 0xf71312b6, 0xebadfe6e, 0xeac31f66, |
| 188 | 0xe3bc4595, 0xa67bc883, 0xb17f37d1, 0x018cff28, |
| 189 | 0xc332ddef, 0xbe6c5aa5, 0x65582185, 0x68ab9802, |
| 190 | 0xeecea50f, 0xdb2f953b, 0x2aef7dad, 0x5b6e2f84, |
| 191 | 0x1521b628, 0x29076170, 0xecdd4775, 0x619f1510, |
| 192 | 0x13cca830, 0xeb61bd96, 0x0334fe1e, 0xaa0363cf, |
| 193 | 0xb5735c90, 0x4c70a239, 0xd59e9e0b, 0xcbaade14, |
| 194 | 0xeecc86bc, 0x60622ca7, 0x9cab5cab, 0xb2f3846e, |
| 195 | 0x648b1eaf, 0x19bdf0ca, 0xa02369b9, 0x655abb50, |
| 196 | 0x40685a32, 0x3c2ab4b3, 0x319ee9d5, 0xc021b8f7, |
| 197 | 0x9b540b19, 0x875fa099, 0x95f7997e, 0x623d7da8, |
| 198 | 0xf837889a, 0x97e32d77, 0x11ed935f, 0x16681281, |
| 199 | 0x0e358829, 0xc7e61fd6, 0x96dedfa1, 0x7858ba99, |
| 200 | 0x57f584a5, 0x1b227263, 0x9b83c3ff, 0x1ac24696, |
| 201 | 0xcdb30aeb, 0x532e3054, 0x8fd948e4, 0x6dbc3128, |
| 202 | 0x58ebf2ef, 0x34c6ffea, 0xfe28ed61, 0xee7c3c73, |
| 203 | 0x5d4a14d9, 0xe864b7e3, 0x42105d14, 0x203e13e0, |
| 204 | 0x45eee2b6, 0xa3aaabea, 0xdb6c4f15, 0xfacb4fd0, |
| 205 | 0xc742f442, 0xef6abbb5, 0x654f3b1d, 0x41cd2105, |
| 206 | 0xd81e799e, 0x86854dc7, 0xe44b476a, 0x3d816250, |
| 207 | 0xcf62a1f2, 0x5b8d2646, 0xfc8883a0, 0xc1c7b6a3, |
| 208 | 0x7f1524c3, 0x69cb7492, 0x47848a0b, 0x5692b285, |
| 209 | 0x095bbf00, 0xad19489d, 0x1462b174, 0x23820e00, |
| 210 | 0x58428d2a, 0x0c55f5ea, 0x1dadf43e, 0x233f7061, |
| 211 | 0x3372f092, 0x8d937e41, 0xd65fecf1, 0x6c223bdb, |
| 212 | 0x7cde3759, 0xcbee7460, 0x4085f2a7, 0xce77326e, |
| 213 | 0xa6078084, 0x19f8509e, 0xe8efd855, 0x61d99735, |
| 214 | 0xa969a7aa, 0xc50c06c2, 0x5a04abfc, 0x800bcadc, |
| 215 | 0x9e447a2e, 0xc3453484, 0xfdd56705, 0x0e1e9ec9, |
| 216 | 0xdb73dbd3, 0x105588cd, 0x675fda79, 0xe3674340, |
| 217 | 0xc5c43465, 0x713e38d8, 0x3d28f89e, 0xf16dff20, |
| 218 | 0x153e21e7, 0x8fb03d4a, 0xe6e39f2b, 0xdb83adf7 |
| 219 | }, { |
| 220 | 0xe93d5a68, 0x948140f7, 0xf64c261c, 0x94692934, |
| 221 | 0x411520f7, 0x7602d4f7, 0xbcf46b2e, 0xd4a20068, |
| 222 | 0xd4082471, 0x3320f46a, 0x43b7d4b7, 0x500061af, |
| 223 | 0x1e39f62e, 0x97244546, 0x14214f74, 0xbf8b8840, |
| 224 | 0x4d95fc1d, 0x96b591af, 0x70f4ddd3, 0x66a02f45, |
| 225 | 0xbfbc09ec, 0x03bd9785, 0x7fac6dd0, 0x31cb8504, |
| 226 | 0x96eb27b3, 0x55fd3941, 0xda2547e6, 0xabca0a9a, |
| 227 | 0x28507825, 0x530429f4, 0x0a2c86da, 0xe9b66dfb, |
| 228 | 0x68dc1462, 0xd7486900, 0x680ec0a4, 0x27a18dee, |
| 229 | 0x4f3ffea2, 0xe887ad8c, 0xb58ce006, 0x7af4d6b6, |
| 230 | 0xaace1e7c, 0xd3375fec, 0xce78a399, 0x406b2a42, |
| 231 | 0x20fe9e35, 0xd9f385b9, 0xee39d7ab, 0x3b124e8b, |
| 232 | 0x1dc9faf7, 0x4b6d1856, 0x26a36631, 0xeae397b2, |
| 233 | 0x3a6efa74, 0xdd5b4332, 0x6841e7f7, 0xca7820fb, |
| 234 | 0xfb0af54e, 0xd8feb397, 0x454056ac, 0xba489527, |
| 235 | 0x55533a3a, 0x20838d87, 0xfe6ba9b7, 0xd096954b, |
| 236 | 0x55a867bc, 0xa1159a58, 0xcca92963, 0x99e1db33, |
| 237 | 0xa62a4a56, 0x3f3125f9, 0x5ef47e1c, 0x9029317c, |
| 238 | 0xfdf8e802, 0x04272f70, 0x80bb155c, 0x05282ce3, |
| 239 | 0x95c11548, 0xe4c66d22, 0x48c1133f, 0xc70f86dc, |
| 240 | 0x07f9c9ee, 0x41041f0f, 0x404779a4, 0x5d886e17, |
| 241 | 0x325f51eb, 0xd59bc0d1, 0xf2bcc18f, 0x41113564, |
| 242 | 0x257b7834, 0x602a9c60, 0xdff8e8a3, 0x1f636c1b, |
| 243 | 0x0e12b4c2, 0x02e1329e, 0xaf664fd1, 0xcad18115, |
| 244 | 0x6b2395e0, 0x333e92e1, 0x3b240b62, 0xeebeb922, |
| 245 | 0x85b2a20e, 0xe6ba0d99, 0xde720c8c, 0x2da2f728, |
| 246 | 0xd0127845, 0x95b794fd, 0x647d0862, 0xe7ccf5f0, |
| 247 | 0x5449a36f, 0x877d48fa, 0xc39dfd27, 0xf33e8d1e, |
| 248 | 0x0a476341, 0x992eff74, 0x3a6f6eab, 0xf4f8fd37, |
| 249 | 0xa812dc60, 0xa1ebddf8, 0x991be14c, 0xdb6e6b0d, |
| 250 | 0xc67b5510, 0x6d672c37, 0x2765d43b, 0xdcd0e804, |
| 251 | 0xf1290dc7, 0xcc00ffa3, 0xb5390f92, 0x690fed0b, |
| 252 | 0x667b9ffb, 0xcedb7d9c, 0xa091cf0b, 0xd9155ea3, |
| 253 | 0xbb132f88, 0x515bad24, 0x7b9479bf, 0x763bd6eb, |
| 254 | 0x37392eb3, 0xcc115979, 0x8026e297, 0xf42e312d, |
| 255 | 0x6842ada7, 0xc66a2b3b, 0x12754ccc, 0x782ef11c, |
| 256 | 0x6a124237, 0xb79251e7, 0x06a1bbe6, 0x4bfb6350, |
| 257 | 0x1a6b1018, 0x11caedfa, 0x3d25bdd8, 0xe2e1c3c9, |
| 258 | 0x44421659, 0x0a121386, 0xd90cec6e, 0xd5abea2a, |
| 259 | 0x64af674e, 0xda86a85f, 0xbebfe988, 0x64e4c3fe, |
| 260 | 0x9dbc8057, 0xf0f7c086, 0x60787bf8, 0x6003604d, |
| 261 | 0xd1fd8346, 0xf6381fb0, 0x7745ae04, 0xd736fccc, |
| 262 | 0x83426b33, 0xf01eab71, 0xb0804187, 0x3c005e5f, |
| 263 | 0x77a057be, 0xbde8ae24, 0x55464299, 0xbf582e61, |
| 264 | 0x4e58f48f, 0xf2ddfda2, 0xf474ef38, 0x8789bdc2, |
| 265 | 0x5366f9c3, 0xc8b38e74, 0xb475f255, 0x46fcd9b9, |
| 266 | 0x7aeb2661, 0x8b1ddf84, 0x846a0e79, 0x915f95e2, |
| 267 | 0x466e598e, 0x20b45770, 0x8cd55591, 0xc902de4c, |
| 268 | 0xb90bace1, 0xbb8205d0, 0x11a86248, 0x7574a99e, |
| 269 | 0xb77f19b6, 0xe0a9dc09, 0x662d09a1, 0xc4324633, |
| 270 | 0xe85a1f02, 0x09f0be8c, 0x4a99a025, 0x1d6efe10, |
| 271 | 0x1ab93d1d, 0x0ba5a4df, 0xa186f20f, 0x2868f169, |
| 272 | 0xdcb7da83, 0x573906fe, 0xa1e2ce9b, 0x4fcd7f52, |
| 273 | 0x50115e01, 0xa70683fa, 0xa002b5c4, 0x0de6d027, |
| 274 | 0x9af88c27, 0x773f8641, 0xc3604c06, 0x61a806b5, |
| 275 | 0xf0177a28, 0xc0f586e0, 0x006058aa, 0x30dc7d62, |
| 276 | 0x11e69ed7, 0x2338ea63, 0x53c2dd94, 0xc2c21634, |
| 277 | 0xbbcbee56, 0x90bcb6de, 0xebfc7da1, 0xce591d76, |
| 278 | 0x6f05e409, 0x4b7c0188, 0x39720a3d, 0x7c927c24, |
| 279 | 0x86e3725f, 0x724d9db9, 0x1ac15bb4, 0xd39eb8fc, |
| 280 | 0xed545578, 0x08fca5b5, 0xd83d7cd3, 0x4dad0fc4, |
| 281 | 0x1e50ef5e, 0xb161e6f8, 0xa28514d9, 0x6c51133c, |
| 282 | 0x6fd5c7e7, 0x56e14ec4, 0x362abfce, 0xddc6c837, |
| 283 | 0xd79a3234, 0x92638212, 0x670efa8e, 0x406000e0 |
| 284 | }, { |
| 285 | 0x3a39ce37, 0xd3faf5cf, 0xabc27737, 0x5ac52d1b, |
| 286 | 0x5cb0679e, 0x4fa33742, 0xd3822740, 0x99bc9bbe, |
| 287 | 0xd5118e9d, 0xbf0f7315, 0xd62d1c7e, 0xc700c47b, |
| 288 | 0xb78c1b6b, 0x21a19045, 0xb26eb1be, 0x6a366eb4, |
| 289 | 0x5748ab2f, 0xbc946e79, 0xc6a376d2, 0x6549c2c8, |
| 290 | 0x530ff8ee, 0x468dde7d, 0xd5730a1d, 0x4cd04dc6, |
| 291 | 0x2939bbdb, 0xa9ba4650, 0xac9526e8, 0xbe5ee304, |
| 292 | 0xa1fad5f0, 0x6a2d519a, 0x63ef8ce2, 0x9a86ee22, |
| 293 | 0xc089c2b8, 0x43242ef6, 0xa51e03aa, 0x9cf2d0a4, |
| 294 | 0x83c061ba, 0x9be96a4d, 0x8fe51550, 0xba645bd6, |
| 295 | 0x2826a2f9, 0xa73a3ae1, 0x4ba99586, 0xef5562e9, |
| 296 | 0xc72fefd3, 0xf752f7da, 0x3f046f69, 0x77fa0a59, |
| 297 | 0x80e4a915, 0x87b08601, 0x9b09e6ad, 0x3b3ee593, |
| 298 | 0xe990fd5a, 0x9e34d797, 0x2cf0b7d9, 0x022b8b51, |
| 299 | 0x96d5ac3a, 0x017da67d, 0xd1cf3ed6, 0x7c7d2d28, |
| 300 | 0x1f9f25cf, 0xadf2b89b, 0x5ad6b472, 0x5a88f54c, |
| 301 | 0xe029ac71, 0xe019a5e6, 0x47b0acfd, 0xed93fa9b, |
| 302 | 0xe8d3c48d, 0x283b57cc, 0xf8d56629, 0x79132e28, |
| 303 | 0x785f0191, 0xed756055, 0xf7960e44, 0xe3d35e8c, |
| 304 | 0x15056dd4, 0x88f46dba, 0x03a16125, 0x0564f0bd, |
| 305 | 0xc3eb9e15, 0x3c9057a2, 0x97271aec, 0xa93a072a, |
| 306 | 0x1b3f6d9b, 0x1e6321f5, 0xf59c66fb, 0x26dcf319, |
| 307 | 0x7533d928, 0xb155fdf5, 0x03563482, 0x8aba3cbb, |
| 308 | 0x28517711, 0xc20ad9f8, 0xabcc5167, 0xccad925f, |
| 309 | 0x4de81751, 0x3830dc8e, 0x379d5862, 0x9320f991, |
| 310 | 0xea7a90c2, 0xfb3e7bce, 0x5121ce64, 0x774fbe32, |
| 311 | 0xa8b6e37e, 0xc3293d46, 0x48de5369, 0x6413e680, |
| 312 | 0xa2ae0810, 0xdd6db224, 0x69852dfd, 0x09072166, |
| 313 | 0xb39a460a, 0x6445c0dd, 0x586cdecf, 0x1c20c8ae, |
| 314 | 0x5bbef7dd, 0x1b588d40, 0xccd2017f, 0x6bb4e3bb, |
| 315 | 0xdda26a7e, 0x3a59ff45, 0x3e350a44, 0xbcb4cdd5, |
| 316 | 0x72eacea8, 0xfa6484bb, 0x8d6612ae, 0xbf3c6f47, |
| 317 | 0xd29be463, 0x542f5d9e, 0xaec2771b, 0xf64e6370, |
| 318 | 0x740e0d8d, 0xe75b1357, 0xf8721671, 0xaf537d5d, |
| 319 | 0x4040cb08, 0x4eb4e2cc, 0x34d2466a, 0x0115af84, |
| 320 | 0xe1b00428, 0x95983a1d, 0x06b89fb4, 0xce6ea048, |
| 321 | 0x6f3f3b82, 0x3520ab82, 0x011a1d4b, 0x277227f8, |
| 322 | 0x611560b1, 0xe7933fdc, 0xbb3a792b, 0x344525bd, |
| 323 | 0xa08839e1, 0x51ce794b, 0x2f32c9b7, 0xa01fbac9, |
| 324 | 0xe01cc87e, 0xbcc7d1f6, 0xcf0111c3, 0xa1e8aac7, |
| 325 | 0x1a908749, 0xd44fbd9a, 0xd0dadecb, 0xd50ada38, |
| 326 | 0x0339c32a, 0xc6913667, 0x8df9317c, 0xe0b12b4f, |
| 327 | 0xf79e59b7, 0x43f5bb3a, 0xf2d519ff, 0x27d9459c, |
| 328 | 0xbf97222c, 0x15e6fc2a, 0x0f91fc71, 0x9b941525, |
| 329 | 0xfae59361, 0xceb69ceb, 0xc2a86459, 0x12baa8d1, |
| 330 | 0xb6c1075e, 0xe3056a0c, 0x10d25065, 0xcb03a442, |
| 331 | 0xe0ec6e0e, 0x1698db3b, 0x4c98a0be, 0x3278e964, |
| 332 | 0x9f1f9532, 0xe0d392df, 0xd3a0342b, 0x8971f21e, |
| 333 | 0x1b0a7441, 0x4ba3348c, 0xc5be7120, 0xc37632d8, |
| 334 | 0xdf359f8d, 0x9b992f2e, 0xe60b6f47, 0x0fe3f11d, |
| 335 | 0xe54cda54, 0x1edad891, 0xce6279cf, 0xcd3e7e6f, |
| 336 | 0x1618b166, 0xfd2c1d05, 0x848fd2c5, 0xf6fb2299, |
| 337 | 0xf523f357, 0xa6327623, 0x93a83531, 0x56cccd02, |
| 338 | 0xacf08162, 0x5a75ebb5, 0x6e163697, 0x88d273cc, |
| 339 | 0xde966292, 0x81b949d0, 0x4c50901b, 0x71c65614, |
| 340 | 0xe6c6c7bd, 0x327a140a, 0x45e1d006, 0xc3f27b9a, |
| 341 | 0xc9aa53fd, 0x62a80f00, 0xbb25bfe2, 0x35bdd2f6, |
| 342 | 0x71126905, 0xb2040222, 0xb6cbcf7c, 0xcd769c2b, |
| 343 | 0x53113ec0, 0x1640e3d3, 0x38abbd60, 0x2547adf0, |
| 344 | 0xba38209c, 0xf746ce76, 0x77afa1c5, 0x20756060, |
| 345 | 0x85cbfe4e, 0x8ae88dd8, 0x7aaaf9b0, 0x4cf9aa7e, |
| 346 | 0x1948c25c, 0x02fb8a8c, 0x01c36ae4, 0xd6ebe1f9, |
| 347 | 0x90d4f869, 0xa65cdea0, 0x3f09252d, 0xc208e69f, |
| 348 | 0xb74e6132, 0xce77e25b, 0x578fdfe3, 0x3ac372e6 |
| 349 | } |
| 350 | } |
| 351 | }}; |
| 352 | |
| 353 | static const unsigned char BF_itoa64[64 + 1] = |
| 354 | "./ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"; |
| 355 | |
| 356 | static const unsigned char BF_atoi64[0x60] = { |
| 357 | 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 0, 1, |
| 358 | 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 64, 64, 64, 64, 64, |
| 359 | 64, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, |
| 360 | 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 64, 64, 64, 64, 64, |
| 361 | 64, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, |
| 362 | 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 64, 64, 64, 64, 64 |
| 363 | }; |
| 364 | |
| 365 | #define BF_safe_atoi64(dst, src) \ |
| 366 | { \ |
| 367 | tmp = (unsigned char)(src); \ |
| 368 | if ((unsigned int)(tmp -= 0x20) >= 0x60) return -1; \ |
| 369 | tmp = BF_atoi64[tmp]; \ |
| 370 | if (tmp > 63) return -1; \ |
| 371 | (dst) = tmp; \ |
| 372 | } |
| 373 | |
| 374 | static int BF_decode(BF_word *dst, const char *src, int size) |
| 375 | { |
| 376 | unsigned char *dptr = (unsigned char *)dst; |
| 377 | unsigned char *end = dptr + size; |
| 378 | const unsigned char *sptr = (const unsigned char *)src; |
| 379 | unsigned int tmp, c1, c2, c3, c4; |
| 380 | |
| 381 | do { |
| 382 | BF_safe_atoi64(c1, *sptr++); |
| 383 | BF_safe_atoi64(c2, *sptr++); |
| 384 | *dptr++ = (c1 << 2) | ((c2 & 0x30) >> 4); |
| 385 | if (dptr >= end) break; |
| 386 | |
| 387 | BF_safe_atoi64(c3, *sptr++); |
| 388 | *dptr++ = ((c2 & 0x0F) << 4) | ((c3 & 0x3C) >> 2); |
| 389 | if (dptr >= end) break; |
| 390 | |
| 391 | BF_safe_atoi64(c4, *sptr++); |
| 392 | *dptr++ = ((c3 & 0x03) << 6) | c4; |
| 393 | } while (dptr < end); |
| 394 | |
| 395 | return 0; |
| 396 | } |
| 397 | |
| 398 | static void BF_encode(char *dst, const BF_word *src, int size) |
| 399 | { |
| 400 | const unsigned char *sptr = (const unsigned char *)src; |
| 401 | const unsigned char *end = sptr + size; |
| 402 | unsigned char *dptr = (unsigned char *)dst; |
| 403 | unsigned int c1, c2; |
| 404 | |
| 405 | do { |
| 406 | c1 = *sptr++; |
| 407 | *dptr++ = BF_itoa64[c1 >> 2]; |
| 408 | c1 = (c1 & 0x03) << 4; |
| 409 | if (sptr >= end) { |
| 410 | *dptr++ = BF_itoa64[c1]; |
| 411 | break; |
| 412 | } |
| 413 | |
| 414 | c2 = *sptr++; |
| 415 | c1 |= c2 >> 4; |
| 416 | *dptr++ = BF_itoa64[c1]; |
| 417 | c1 = (c2 & 0x0f) << 2; |
| 418 | if (sptr >= end) { |
| 419 | *dptr++ = BF_itoa64[c1]; |
| 420 | break; |
| 421 | } |
| 422 | |
| 423 | c2 = *sptr++; |
| 424 | c1 |= c2 >> 6; |
| 425 | *dptr++ = BF_itoa64[c1]; |
| 426 | *dptr++ = BF_itoa64[c2 & 0x3f]; |
| 427 | } while (sptr < end); |
| 428 | } |
| 429 | |
| 430 | static void BF_swap(BF_word *x, int count) |
| 431 | { |
| 432 | if ((union { int i; char c; }){1}.c) |
| 433 | do { |
| 434 | BF_word tmp = *x; |
| 435 | tmp = (tmp << 16) | (tmp >> 16); |
| 436 | *x++ = ((tmp & 0x00FF00FF) << 8) | ((tmp >> 8) & 0x00FF00FF); |
| 437 | } while (--count); |
| 438 | } |
| 439 | |
| 440 | #define BF_ROUND(L, R, N) \ |
| 441 | tmp1 = L & 0xFF; \ |
| 442 | tmp2 = L >> 8; \ |
| 443 | tmp2 &= 0xFF; \ |
| 444 | tmp3 = L >> 16; \ |
| 445 | tmp3 &= 0xFF; \ |
| 446 | tmp4 = L >> 24; \ |
| 447 | tmp1 = ctx->s.S[3][tmp1]; \ |
| 448 | tmp2 = ctx->s.S[2][tmp2]; \ |
| 449 | tmp3 = ctx->s.S[1][tmp3]; \ |
| 450 | tmp3 += ctx->s.S[0][tmp4]; \ |
| 451 | tmp3 ^= tmp2; \ |
| 452 | R ^= ctx->s.P[N + 1]; \ |
| 453 | tmp3 += tmp1; \ |
| 454 | R ^= tmp3; |
| 455 | |
| 456 | static BF_word BF_encrypt(BF_ctx *ctx, |
| 457 | BF_word L, BF_word R, |
| 458 | BF_word *start, BF_word *end) |
| 459 | { |
| 460 | BF_word tmp1, tmp2, tmp3, tmp4; |
| 461 | BF_word *ptr = start; |
| 462 | |
| 463 | do { |
| 464 | L ^= ctx->s.P[0]; |
| 465 | #if 0 |
| 466 | BF_ROUND(L, R, 0); |
| 467 | BF_ROUND(R, L, 1); |
| 468 | BF_ROUND(L, R, 2); |
| 469 | BF_ROUND(R, L, 3); |
| 470 | BF_ROUND(L, R, 4); |
| 471 | BF_ROUND(R, L, 5); |
| 472 | BF_ROUND(L, R, 6); |
| 473 | BF_ROUND(R, L, 7); |
| 474 | BF_ROUND(L, R, 8); |
| 475 | BF_ROUND(R, L, 9); |
| 476 | BF_ROUND(L, R, 10); |
| 477 | BF_ROUND(R, L, 11); |
| 478 | BF_ROUND(L, R, 12); |
| 479 | BF_ROUND(R, L, 13); |
| 480 | BF_ROUND(L, R, 14); |
| 481 | BF_ROUND(R, L, 15); |
| 482 | #else |
| 483 | for (int i=0; i<16; i+=2) { |
| 484 | BF_ROUND(L, R, i); |
| 485 | BF_ROUND(R, L, i+1); |
| 486 | } |
| 487 | #endif |
| 488 | tmp4 = R; |
| 489 | R = L; |
| 490 | L = tmp4 ^ ctx->s.P[BF_N + 1]; |
| 491 | *ptr++ = L; |
| 492 | *ptr++ = R; |
| 493 | } while (ptr < end); |
| 494 | |
| 495 | return L; |
| 496 | } |
| 497 | |
| 498 | static void BF_set_key(const char *key, BF_key expanded, BF_key initial, |
| 499 | unsigned char flags) |
| 500 | { |
| 501 | const char *ptr = key; |
| 502 | unsigned int bug, i, j; |
| 503 | BF_word safety, sign, diff, tmp[2]; |
| 504 | |
| 505 | /* |
| 506 | * There was a sign extension bug in older revisions of this function. While |
| 507 | * we would have liked to simply fix the bug and move on, we have to provide |
| 508 | * a backwards compatibility feature (essentially the bug) for some systems and |
| 509 | * a safety measure for some others. The latter is needed because for certain |
| 510 | * multiple inputs to the buggy algorithm there exist easily found inputs to |
| 511 | * the correct algorithm that produce the same hash. Thus, we optionally |
| 512 | * deviate from the correct algorithm just enough to avoid such collisions. |
| 513 | * While the bug itself affected the majority of passwords containing |
| 514 | * characters with the 8th bit set (although only a percentage of those in a |
| 515 | * collision-producing way), the anti-collision safety measure affects |
| 516 | * only a subset of passwords containing the '\xff' character (not even all of |
| 517 | * those passwords, just some of them). This character is not found in valid |
| 518 | * UTF-8 sequences and is rarely used in popular 8-bit character encodings. |
| 519 | * Thus, the safety measure is unlikely to cause much annoyance, and is a |
| 520 | * reasonable tradeoff to use when authenticating against existing hashes that |
| 521 | * are not reliably known to have been computed with the correct algorithm. |
| 522 | * |
| 523 | * We use an approach that tries to minimize side-channel leaks of password |
| 524 | * information - that is, we mostly use fixed-cost bitwise operations instead |
| 525 | * of branches or table lookups. (One conditional branch based on password |
| 526 | * length remains. It is not part of the bug aftermath, though, and is |
| 527 | * difficult and possibly unreasonable to avoid given the use of C strings by |
| 528 | * the caller, which results in similar timing leaks anyway.) |
| 529 | * |
| 530 | * For actual implementation, we set an array index in the variable "bug" |
| 531 | * (0 means no bug, 1 means sign extension bug emulation) and a flag in the |
| 532 | * variable "safety" (bit 16 is set when the safety measure is requested). |
| 533 | * Valid combinations of settings are: |
| 534 | * |
| 535 | * Prefix "$2a$": bug = 0, safety = 0x10000 |
| 536 | * Prefix "$2x$": bug = 1, safety = 0 |
| 537 | * Prefix "$2y$": bug = 0, safety = 0 |
| 538 | */ |
| 539 | bug = flags & 1; |
| 540 | safety = ((BF_word)flags & 2) << 15; |
| 541 | |
| 542 | sign = diff = 0; |
| 543 | |
| 544 | for (i = 0; i < BF_N + 2; i++) { |
| 545 | tmp[0] = tmp[1] = 0; |
| 546 | for (j = 0; j < 4; j++) { |
| 547 | tmp[0] <<= 8; |
| 548 | tmp[0] |= (unsigned char)*ptr; /* correct */ |
| 549 | tmp[1] <<= 8; |
| 550 | tmp[1] |= (signed char)*ptr; /* bug */ |
| 551 | /* |
| 552 | * Sign extension in the first char has no effect - nothing to overwrite yet, |
| 553 | * and those extra 24 bits will be fully shifted out of the 32-bit word. For |
| 554 | * chars 2, 3, 4 in each four-char block, we set bit 7 of "sign" if sign |
| 555 | * extension in tmp[1] occurs. Once this flag is set, it remains set. |
| 556 | */ |
| 557 | if (j) |
| 558 | sign |= tmp[1] & 0x80; |
| 559 | if (!*ptr) |
| 560 | ptr = key; |
| 561 | else |
| 562 | ptr++; |
| 563 | } |
| 564 | diff |= tmp[0] ^ tmp[1]; /* Non-zero on any differences */ |
| 565 | |
| 566 | expanded[i] = tmp[bug]; |
| 567 | initial[i] = BF_init_state.s.P[i] ^ tmp[bug]; |
| 568 | } |
| 569 | |
| 570 | /* |
| 571 | * At this point, "diff" is zero iff the correct and buggy algorithms produced |
| 572 | * exactly the same result. If so and if "sign" is non-zero, which indicates |
| 573 | * that there was a non-benign sign extension, this means that we have a |
| 574 | * collision between the correctly computed hash for this password and a set of |
| 575 | * passwords that could be supplied to the buggy algorithm. Our safety measure |
| 576 | * is meant to protect from such many-buggy to one-correct collisions, by |
| 577 | * deviating from the correct algorithm in such cases. Let's check for this. |
| 578 | */ |
| 579 | diff |= diff >> 16; /* still zero iff exact match */ |
| 580 | diff &= 0xffff; /* ditto */ |
| 581 | diff += 0xffff; /* bit 16 set iff "diff" was non-zero (on non-match) */ |
| 582 | sign <<= 9; /* move the non-benign sign extension flag to bit 16 */ |
| 583 | sign &= ~diff & safety; /* action needed? */ |
| 584 | |
| 585 | /* |
| 586 | * If we have determined that we need to deviate from the correct algorithm, |
| 587 | * flip bit 16 in initial expanded key. (The choice of 16 is arbitrary, but |
| 588 | * let's stick to it now. It came out of the approach we used above, and it's |
| 589 | * not any worse than any other choice we could make.) |
| 590 | * |
| 591 | * It is crucial that we don't do the same to the expanded key used in the main |
| 592 | * Eksblowfish loop. By doing it to only one of these two, we deviate from a |
| 593 | * state that could be directly specified by a password to the buggy algorithm |
| 594 | * (and to the fully correct one as well, but that's a side-effect). |
| 595 | */ |
| 596 | initial[0] ^= sign; |
| 597 | } |
| 598 | |
| 599 | static char *BF_crypt(const char *key, const char *setting, |
| 600 | char *output, BF_word min) |
| 601 | { |
| 602 | static const unsigned char flags_by_subtype[26] = |
| 603 | {2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
| 604 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 4, 0}; |
| 605 | struct { |
| 606 | BF_ctx ctx; |
| 607 | BF_key expanded_key; |
| 608 | union { |
| 609 | BF_word salt[4]; |
| 610 | BF_word output[6]; |
| 611 | } binary; |
| 612 | } data; |
| 613 | BF_word count; |
| 614 | int i; |
| 615 | |
| 616 | if (setting[0] != '$' || |
| 617 | setting[1] != '2' || |
| 618 | setting[2] - 'a' > 25U || |
| 619 | !flags_by_subtype[setting[2] - 'a'] || |
| 620 | setting[3] != '$' || |
| 621 | setting[4] - '0' > 1U || |
| 622 | setting[5] - '0' > 9U || |
| 623 | setting[6] != '$') { |
| 624 | return NULL; |
| 625 | } |
| 626 | |
| 627 | count = (BF_word)1 << ((setting[4] - '0') * 10 + (setting[5] - '0')); |
Rich Felker | aeaceb1 | 2012-09-15 03:03:21 -0400 | [diff] [blame] | 628 | if (count < min || BF_decode(data.binary.salt, &setting[7], 16)) { |
Rich Felker | a02bf5f | 2012-08-10 00:20:00 -0400 | [diff] [blame] | 629 | return NULL; |
| 630 | } |
| 631 | BF_swap(data.binary.salt, 4); |
| 632 | |
| 633 | BF_set_key(key, data.expanded_key, data.ctx.s.P, |
| 634 | flags_by_subtype[setting[2] - 'a']); |
| 635 | |
| 636 | memcpy(data.ctx.s.S, BF_init_state.s.S, sizeof(data.ctx.s.S)); |
| 637 | |
| 638 | { |
| 639 | BF_word L = 0, R = 0; |
| 640 | BF_word *ptr = &data.ctx.PS[0]; |
| 641 | do { |
| 642 | L = BF_encrypt(&data.ctx, |
| 643 | L ^ data.binary.salt[0], R ^ data.binary.salt[1], |
| 644 | ptr, ptr); |
| 645 | R = *(ptr + 1); |
| 646 | ptr += 2; |
| 647 | |
| 648 | if (ptr >= &data.ctx.PS[BF_N + 2 + 4 * 0x100]) |
| 649 | break; |
| 650 | |
| 651 | L = BF_encrypt(&data.ctx, |
| 652 | L ^ data.binary.salt[2], R ^ data.binary.salt[3], |
| 653 | ptr, ptr); |
| 654 | R = *(ptr + 1); |
| 655 | ptr += 2; |
| 656 | } while (1); |
| 657 | } |
| 658 | |
| 659 | do { |
| 660 | int done; |
| 661 | |
| 662 | for (i = 0; i < BF_N + 2; i += 2) { |
| 663 | data.ctx.s.P[i] ^= data.expanded_key[i]; |
| 664 | data.ctx.s.P[i + 1] ^= data.expanded_key[i + 1]; |
| 665 | } |
| 666 | |
| 667 | done = 0; |
| 668 | do { |
| 669 | BF_encrypt(&data.ctx, 0, 0, |
| 670 | &data.ctx.PS[0], |
| 671 | &data.ctx.PS[BF_N + 2 + 4 * 0x100]); |
| 672 | |
| 673 | if (done) |
| 674 | break; |
| 675 | done = 1; |
| 676 | |
| 677 | { |
| 678 | BF_word tmp1, tmp2, tmp3, tmp4; |
| 679 | |
| 680 | tmp1 = data.binary.salt[0]; |
| 681 | tmp2 = data.binary.salt[1]; |
| 682 | tmp3 = data.binary.salt[2]; |
| 683 | tmp4 = data.binary.salt[3]; |
| 684 | for (i = 0; i < BF_N; i += 4) { |
| 685 | data.ctx.s.P[i] ^= tmp1; |
| 686 | data.ctx.s.P[i + 1] ^= tmp2; |
| 687 | data.ctx.s.P[i + 2] ^= tmp3; |
| 688 | data.ctx.s.P[i + 3] ^= tmp4; |
| 689 | } |
| 690 | data.ctx.s.P[16] ^= tmp1; |
| 691 | data.ctx.s.P[17] ^= tmp2; |
| 692 | } |
| 693 | } while (1); |
| 694 | } while (--count); |
| 695 | |
| 696 | for (i = 0; i < 6; i += 2) { |
| 697 | BF_word L, LR[2]; |
| 698 | |
| 699 | L = BF_magic_w[i]; |
| 700 | LR[1] = BF_magic_w[i + 1]; |
| 701 | |
| 702 | count = 64; |
| 703 | do { |
| 704 | L = BF_encrypt(&data.ctx, L, LR[1], |
| 705 | &LR[0], &LR[0]); |
| 706 | } while (--count); |
| 707 | |
| 708 | data.binary.output[i] = L; |
| 709 | data.binary.output[i + 1] = LR[1]; |
| 710 | } |
| 711 | |
| 712 | memcpy(output, setting, 7 + 22 - 1); |
| 713 | output[7 + 22 - 1] = BF_itoa64[ |
| 714 | BF_atoi64[setting[7 + 22 - 1] - 0x20] & 0x30]; |
| 715 | |
| 716 | /* This has to be bug-compatible with the original implementation, so |
| 717 | * only encode 23 of the 24 bytes. :-) */ |
| 718 | BF_swap(data.binary.output, 6); |
| 719 | BF_encode(&output[7 + 22], data.binary.output, 23); |
| 720 | output[7 + 22 + 31] = '\0'; |
| 721 | |
| 722 | return output; |
| 723 | } |
| 724 | |
| 725 | /* |
| 726 | * Please preserve the runtime self-test. It serves two purposes at once: |
| 727 | * |
| 728 | * 1. We really can't afford the risk of producing incompatible hashes e.g. |
| 729 | * when there's something like gcc bug 26587 again, whereas an application or |
| 730 | * library integrating this code might not also integrate our external tests or |
| 731 | * it might not run them after every build. Even if it does, the miscompile |
| 732 | * might only occur on the production build, but not on a testing build (such |
| 733 | * as because of different optimization settings). It is painful to recover |
| 734 | * from incorrectly-computed hashes - merely fixing whatever broke is not |
| 735 | * enough. Thus, a proactive measure like this self-test is needed. |
| 736 | * |
| 737 | * 2. We don't want to leave sensitive data from our actual password hash |
| 738 | * computation on the stack or in registers. Previous revisions of the code |
| 739 | * would do explicit cleanups, but simply running the self-test after hash |
| 740 | * computation is more reliable. |
| 741 | * |
| 742 | * The performance cost of this quick self-test is around 0.6% at the "$2a$08" |
| 743 | * setting. |
| 744 | */ |
| 745 | char *__crypt_blowfish(const char *key, const char *setting, char *output) |
| 746 | { |
| 747 | const char *test_key = "8b \xd0\xc1\xd2\xcf\xcc\xd8"; |
| 748 | const char *test_setting = "$2a$00$abcdefghijklmnopqrstuu"; |
| 749 | static const char test_hash[2][34] = |
| 750 | {"VUrPmXD6q/nVSSp7pNDhCR9071IfIRe\0\x55", /* $2x$ */ |
| 751 | "i1D709vfamulimlGcq0qq3UvuUasvEa\0\x55"}; /* $2a$, $2y$ */ |
| 752 | char *retval; |
| 753 | const char *p; |
| 754 | int ok; |
| 755 | struct { |
| 756 | char s[7 + 22 + 1]; |
| 757 | char o[7 + 22 + 31 + 1 + 1 + 1]; |
| 758 | } buf; |
| 759 | |
| 760 | /* Hash the supplied password */ |
| 761 | retval = BF_crypt(key, setting, output, 16); |
| 762 | |
| 763 | /* |
| 764 | * Do a quick self-test. It is important that we make both calls to BF_crypt() |
| 765 | * from the same scope such that they likely use the same stack locations, |
| 766 | * which makes the second call overwrite the first call's sensitive data on the |
| 767 | * stack and makes it more likely that any alignment related issues would be |
| 768 | * detected by the self-test. |
| 769 | */ |
| 770 | memcpy(buf.s, test_setting, sizeof(buf.s)); |
| 771 | if (retval) |
| 772 | buf.s[2] = setting[2]; |
| 773 | memset(buf.o, 0x55, sizeof(buf.o)); |
| 774 | buf.o[sizeof(buf.o) - 1] = 0; |
| 775 | p = BF_crypt(test_key, buf.s, buf.o, 1); |
| 776 | |
| 777 | ok = (p == buf.o && |
| 778 | !memcmp(p, buf.s, 7 + 22) && |
| 779 | !memcmp(p + (7 + 22), |
| 780 | test_hash[buf.s[2] & 1], |
| 781 | 31 + 1 + 1 + 1)); |
| 782 | |
| 783 | { |
| 784 | const char *k = "\xff\xa3" "34" "\xff\xff\xff\xa3" "345"; |
| 785 | BF_key ae, ai, ye, yi; |
| 786 | BF_set_key(k, ae, ai, 2); /* $2a$ */ |
| 787 | BF_set_key(k, ye, yi, 4); /* $2y$ */ |
| 788 | ai[0] ^= 0x10000; /* undo the safety (for comparison) */ |
| 789 | ok = ok && ai[0] == 0xdb9c59bc && ye[17] == 0x33343500 && |
| 790 | !memcmp(ae, ye, sizeof(ae)) && |
| 791 | !memcmp(ai, yi, sizeof(ai)); |
| 792 | } |
| 793 | |
| 794 | if (ok && retval) |
| 795 | return retval; |
| 796 | |
| 797 | return "*"; |
| 798 | } |