/* * InspIRCd -- Internet Relay Chat Daemon * * Copyright (C) 2016 Attila Molnar * * This file is part of InspIRCd. InspIRCd is free software: you can * redistribute it and/or modify it under the terms of the GNU General Public * License as published by the Free Software Foundation, version 2. * * This program is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more * details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see . */ /* SHA-1 in C By Steve Reid 100% Public Domain */ #include "inspircd.h" #include "modules/hash.h" union CHAR64LONG16 { unsigned char c[64]; uint32_t l[16]; }; inline static uint32_t rol(uint32_t value, uint32_t bits) { return (value << bits) | (value >> (32 - bits)); } // blk0() and blk() perform the initial expand. // I got the idea of expanding during the round function from SSLeay static bool big_endian; inline static uint32_t blk0(CHAR64LONG16& block, uint32_t i) { if (big_endian) return block.l[i]; else return block.l[i] = (rol(block.l[i], 24) & 0xFF00FF00) | (rol(block.l[i], 8) & 0x00FF00FF); } inline static uint32_t blk(CHAR64LONG16 &block, uint32_t i) { return block.l[i & 15] = rol(block.l[(i + 13) & 15] ^ block.l[(i + 8) & 15] ^ block.l[(i + 2) & 15] ^ block.l[i & 15],1); } // (R0+R1), R2, R3, R4 are the different operations used in SHA1 inline static void R0(CHAR64LONG16& block, uint32_t v, uint32_t &w, uint32_t x, uint32_t y, uint32_t &z, uint32_t i) { z += ((w & (x ^ y)) ^ y) + blk0(block, i) + 0x5A827999 + rol(v, 5); w = rol(w, 30); } inline static void R1(CHAR64LONG16& block, uint32_t v, uint32_t &w, uint32_t x, uint32_t y, uint32_t &z, uint32_t i) { z += ((w & (x ^ y)) ^ y) + blk(block, i) + 0x5A827999 + rol(v, 5); w = rol(w, 30); } inline static void R2(CHAR64LONG16& block, uint32_t v, uint32_t &w, uint32_t x, uint32_t y, uint32_t &z, uint32_t i) { z += (w ^ x ^ y) + blk(block, i) + 0x6ED9EBA1 + rol(v, 5); w = rol(w, 30); } inline static void R3(CHAR64LONG16& block, uint32_t v, uint32_t &w, uint32_t x, uint32_t y, uint32_t &z, uint32_t i) { z += (((w | x) & y) | (w & x)) + blk(block, i) + 0x8F1BBCDC + rol(v, 5); w = rol(w, 30); } inline static void R4(CHAR64LONG16& block, uint32_t v, uint32_t &w, uint32_t x, uint32_t y, uint32_t &z, uint32_t i) { z += (w ^ x ^ y) + blk(block, i) + 0xCA62C1D6 + rol(v, 5); w = rol(w, 30); } static const uint32_t sha1_iv[5] = { 0x67452301, 0xEFCDAB89, 0x98BADCFE, 0x10325476, 0xC3D2E1F0 }; class SHA1Context { uint32_t state[5]; uint32_t count[2]; unsigned char buffer[64]; unsigned char digest[20]; void Transform(const unsigned char buf[64]) { uint32_t a, b, c, d, e; CHAR64LONG16 block; memcpy(block.c, buf, 64); // Copy state[] to working vars a = this->state[0]; b = this->state[1]; c = this->state[2]; d = this->state[3]; e = this->state[4]; // 4 rounds of 20 operations each. Loop unrolled. R0(block, a, b, c, d, e, 0); R0(block, e, a, b, c, d, 1); R0(block, d, e, a, b, c, 2); R0(block, c, d, e, a, b, 3); R0(block, b, c, d, e, a, 4); R0(block, a, b, c, d, e, 5); R0(block, e, a, b, c, d, 6); R0(block, d, e, a, b, c, 7); R0(block, c, d, e, a, b, 8); R0(block, b, c, d, e, a, 9); R0(block, a, b, c, d, e, 10); R0(block, e, a, b, c, d, 11); R0(block, d, e, a, b, c, 12); R0(block, c, d, e, a, b, 13); R0(block, b, c, d, e, a, 14); R0(block, a, b, c, d, e, 15); R1(block, e, a, b, c, d, 16); R1(block, d, e, a, b, c, 17); R1(block, c, d, e, a, b, 18); R1(block, b, c, d, e, a, 19); R2(block, a, b, c, d, e, 20); R2(block, e, a, b, c, d, 21); R2(block, d, e, a, b, c, 22); R2(block, c, d, e, a, b, 23); R2(block, b, c, d, e, a, 24); R2(block, a, b, c, d, e, 25); R2(block, e, a, b, c, d, 26); R2(block, d, e, a, b, c, 27); R2(block, c, d, e, a, b, 28); R2(block, b, c, d, e, a, 29); R2(block, a, b, c, d, e, 30); R2(block, e, a, b, c, d, 31); R2(block, d, e, a, b, c, 32); R2(block, c, d, e, a, b, 33); R2(block, b, c, d, e, a, 34); R2(block, a, b, c, d, e, 35); R2(block, e, a, b, c, d, 36); R2(block, d, e, a, b, c, 37); R2(block, c, d, e, a, b, 38); R2(block, b, c, d, e, a, 39); R3(block, a, b, c, d, e, 40); R3(block, e, a, b, c, d, 41); R3(block, d, e, a, b, c, 42); R3(block, c, d, e, a, b, 43); R3(block, b, c, d, e, a, 44); R3(block, a, b, c, d, e, 45); R3(block, e, a, b, c, d, 46); R3(block, d, e, a, b, c, 47); R3(block, c, d, e, a, b, 48); R3(block, b, c, d, e, a, 49); R3(block, a, b, c, d, e, 50); R3(block, e, a, b, c, d, 51); R3(block, d, e, a, b, c, 52); R3(block, c, d, e, a, b, 53); R3(block, b, c, d, e, a, 54); R3(block, a, b, c, d, e, 55); R3(block, e, a, b, c, d, 56); R3(block, d, e, a, b, c, 57); R3(block, c, d, e, a, b, 58); R3(block, b, c, d, e, a, 59); R4(block, a, b, c, d, e, 60); R4(block, e, a, b, c, d, 61); R4(block, d, e, a, b, c, 62); R4(block, c, d, e, a, b, 63); R4(block, b, c, d, e, a, 64); R4(block, a, b, c, d, e, 65); R4(block, e, a, b, c, d, 66); R4(block, d, e, a, b, c, 67); R4(block, c, d, e, a, b, 68); R4(block, b, c, d, e, a, 69); R4(block, a, b, c, d, e, 70); R4(block, e, a, b, c, d, 71); R4(block, d, e, a, b, c, 72); R4(block, c, d, e, a, b, 73); R4(block, b, c, d, e, a, 74); R4(block, a, b, c, d, e, 75); R4(block, e, a, b, c, d, 76); R4(block, d, e, a, b, c, 77); R4(block, c, d, e, a, b, 78); R4(block, b, c, d, e, a, 79); // Add the working vars back into state[] this->state[0] += a; this->state[1] += b; this->state[2] += c; this->state[3] += d; this->state[4] += e; } public: SHA1Context() { for (int i = 0; i < 5; ++i) this->state[i] = sha1_iv[i]; this->count[0] = this->count[1] = 0; memset(this->buffer, 0, sizeof(this->buffer)); memset(this->digest, 0, sizeof(this->digest)); } void Update(const unsigned char* data, size_t len) { uint32_t i, j; j = (this->count[0] >> 3) & 63; if ((this->count[0] += len << 3) < (len << 3)) ++this->count[1]; this->count[1] += len >> 29; if (j + len > 63) { memcpy(&this->buffer[j], data, (i = 64 - j)); this->Transform(this->buffer); for (; i + 63 < len; i += 64) this->Transform(&data[i]); j = 0; } else i = 0; memcpy(&this->buffer[j], &data[i], len - i); } void Finalize() { uint32_t i; unsigned char finalcount[8]; for (i = 0; i < 8; ++i) finalcount[i] = static_cast((this->count[i >= 4 ? 0 : 1] >> ((3 - (i & 3)) * 8)) & 255); /* Endian independent */ this->Update(reinterpret_cast("\200"), 1); while ((this->count[0] & 504) != 448) this->Update(reinterpret_cast("\0"), 1); this->Update(finalcount, 8); // Should cause a SHA1Transform() for (i = 0; i < 20; ++i) this->digest[i] = static_cast((this->state[i>>2] >> ((3 - (i & 3)) * 8)) & 255); this->Transform(this->buffer); } std::string GetRaw() const { return std::string((const char*)digest, sizeof(digest)); } }; class SHA1HashProvider : public HashProvider { public: SHA1HashProvider(Module* mod) : HashProvider(mod, "hash/sha1", 20, 64) { } std::string GenerateRaw(const std::string& data) { SHA1Context ctx; ctx.Update(reinterpret_cast(data.data()), data.length()); ctx.Finalize(); return ctx.GetRaw(); } }; class ModuleSHA1 : public Module { SHA1HashProvider sha1; public: ModuleSHA1() : sha1(this) { big_endian = (htonl(1337) == 1337); } Version GetVersion() { return Version("Implements SHA-1 hashing", VF_VENDOR); } }; MODULE_INIT(ModuleSHA1)