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// Copyright (c) 2014 The Bitcoin developers
// Distributed under the MIT/X11 software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#include "crypto/sha1.h"
#include <string.h>
// Internal implementation code.
namespace {
/** Read 4 bytes, and interpret them as a 32-bit unsigned big-endian integer. */
uint32_t inline ReadBE32(const unsigned char *data) {
return ((uint32_t)data[0] << 24 | (uint32_t)data[1] << 16 | (uint32_t)data[2] << 8 | (uint32_t)data[3]);
}
/** Write a 32-bit unsigned big-endian integer. */
void inline WriteBE32(unsigned char *data, uint32_t x) {
data[0] = x >> 24;
data[1] = x >> 16;
data[2] = x >> 8;
data[3] = x;
}
/// Internal SHA-1 implementation.
namespace sha1 {
/** One round of SHA-1. */
void inline Round(uint32_t a, uint32_t &b, uint32_t c, uint32_t d, uint32_t &e,
uint32_t f, uint32_t k, uint32_t w) {
e += ((a << 5) | (a >> 27)) + f + k + w;
b = (b << 30) | (b >> 2);
}
uint32_t inline f1(uint32_t b, uint32_t c, uint32_t d) { return d ^ (b & (c ^ d)); }
uint32_t inline f2(uint32_t b, uint32_t c, uint32_t d) { return b ^ c ^ d; }
uint32_t inline f3(uint32_t b, uint32_t c, uint32_t d) { return (b & c) | (d & (b | c)); }
uint32_t inline left(uint32_t x) { return (x << 1) | (x >> 31); }
/** Initialize SHA-1 state. */
void inline Initialize(uint32_t *s) {
s[0] = 0x67452301ul;
s[1] = 0xEFCDAB89ul;
s[2] = 0x98BADCFEul;
s[3] = 0x10325476ul;
s[4] = 0xC3D2E1F0ul;
}
const uint32_t k1 = 0x5A827999ul;
const uint32_t k2 = 0x6ED9EBA1ul;
const uint32_t k3 = 0x8F1BBCDCul;
const uint32_t k4 = 0xCA62C1D6ul;
/** Perform a SHA-1 transformation, processing a 64-byte chunk. */
void Transform(uint32_t *s, const unsigned char *chunk) {
uint32_t a = s[0], b = s[1], c = s[2], d = s[3], e = s[4];
uint32_t w0, w1, w2, w3, w4, w5, w6, w7, w8, w9, w10, w11, w12, w13, w14, w15;
Round(a, b, c, d, e, f1(b, c, d), k1, w0 = ReadBE32(chunk + 0));
Round(e, a, b, c, d, f1(a, b, c), k1, w1 = ReadBE32(chunk + 4));
Round(d, e, a, b, c, f1(e, a, b), k1, w2 = ReadBE32(chunk + 8));
Round(c, d, e, a, b, f1(d, e, a), k1, w3 = ReadBE32(chunk + 12));
Round(b, c, d, e, a, f1(c, d, e), k1, w4 = ReadBE32(chunk + 16));
Round(a, b, c, d, e, f1(b, c, d), k1, w5 = ReadBE32(chunk + 20));
Round(e, a, b, c, d, f1(a, b, c), k1, w6 = ReadBE32(chunk + 24));
Round(d, e, a, b, c, f1(e, a, b), k1, w7 = ReadBE32(chunk + 28));
Round(c, d, e, a, b, f1(d, e, a), k1, w8 = ReadBE32(chunk + 32));
Round(b, c, d, e, a, f1(c, d, e), k1, w9 = ReadBE32(chunk + 36));
Round(a, b, c, d, e, f1(b, c, d), k1, w10 = ReadBE32(chunk + 40));
Round(e, a, b, c, d, f1(a, b, c), k1, w11 = ReadBE32(chunk + 44));
Round(d, e, a, b, c, f1(e, a, b), k1, w12 = ReadBE32(chunk + 48));
Round(c, d, e, a, b, f1(d, e, a), k1, w13 = ReadBE32(chunk + 52));
Round(b, c, d, e, a, f1(c, d, e), k1, w14 = ReadBE32(chunk + 56));
Round(a, b, c, d, e, f1(b, c, d), k1, w15 = ReadBE32(chunk + 60));
Round(e, a, b, c, d, f1(a, b, c), k1, w0 = left(w0 ^ w13 ^ w8 ^ w2 ));
Round(d, e, a, b, c, f1(e, a, b), k1, w1 = left(w1 ^ w14 ^ w9 ^ w3 ));
Round(c, d, e, a, b, f1(d, e, a), k1, w2 = left(w2 ^ w15 ^ w10 ^ w4 ));
Round(b, c, d, e, a, f1(c, d, e), k1, w3 = left(w3 ^ w0 ^ w11 ^ w5 ));
Round(a, b, c, d, e, f2(b, c, d), k2, w4 = left(w4 ^ w1 ^ w12 ^ w6 ));
Round(e, a, b, c, d, f2(a, b, c), k2, w5 = left(w5 ^ w2 ^ w13 ^ w7 ));
Round(d, e, a, b, c, f2(e, a, b), k2, w6 = left(w6 ^ w3 ^ w14 ^ w8 ));
Round(c, d, e, a, b, f2(d, e, a), k2, w7 = left(w7 ^ w4 ^ w15 ^ w9 ));
Round(b, c, d, e, a, f2(c, d, e), k2, w8 = left(w8 ^ w5 ^ w0 ^ w10));
Round(a, b, c, d, e, f2(b, c, d), k2, w9 = left(w9 ^ w6 ^ w1 ^ w11));
Round(e, a, b, c, d, f2(a, b, c), k2, w10 = left(w10 ^ w7 ^ w2 ^ w12));
Round(d, e, a, b, c, f2(e, a, b), k2, w11 = left(w11 ^ w8 ^ w3 ^ w13));
Round(c, d, e, a, b, f2(d, e, a), k2, w12 = left(w12 ^ w9 ^ w4 ^ w14));
Round(b, c, d, e, a, f2(c, d, e), k2, w13 = left(w13 ^ w10 ^ w5 ^ w15));
Round(a, b, c, d, e, f2(b, c, d), k2, w14 = left(w14 ^ w11 ^ w6 ^ w0 ));
Round(e, a, b, c, d, f2(a, b, c), k2, w15 = left(w15 ^ w12 ^ w7 ^ w1 ));
Round(d, e, a, b, c, f2(e, a, b), k2, w0 = left(w0 ^ w13 ^ w8 ^ w2 ));
Round(c, d, e, a, b, f2(d, e, a), k2, w1 = left(w1 ^ w14 ^ w9 ^ w3 ));
Round(b, c, d, e, a, f2(c, d, e), k2, w2 = left(w2 ^ w15 ^ w10 ^ w4 ));
Round(a, b, c, d, e, f2(b, c, d), k2, w3 = left(w3 ^ w0 ^ w11 ^ w5 ));
Round(e, a, b, c, d, f2(a, b, c), k2, w4 = left(w4 ^ w1 ^ w12 ^ w6 ));
Round(d, e, a, b, c, f2(e, a, b), k2, w5 = left(w5 ^ w2 ^ w13 ^ w7 ));
Round(c, d, e, a, b, f2(d, e, a), k2, w6 = left(w6 ^ w3 ^ w14 ^ w8 ));
Round(b, c, d, e, a, f2(c, d, e), k2, w7 = left(w7 ^ w4 ^ w15 ^ w9 ));
Round(a, b, c, d, e, f3(b, c, d), k3, w8 = left(w8 ^ w5 ^ w0 ^ w10));
Round(e, a, b, c, d, f3(a, b, c), k3, w9 = left(w9 ^ w6 ^ w1 ^ w11));
Round(d, e, a, b, c, f3(e, a, b), k3, w10 = left(w10 ^ w7 ^ w2 ^ w12));
Round(c, d, e, a, b, f3(d, e, a), k3, w11 = left(w11 ^ w8 ^ w3 ^ w13));
Round(b, c, d, e, a, f3(c, d, e), k3, w12 = left(w12 ^ w9 ^ w4 ^ w14));
Round(a, b, c, d, e, f3(b, c, d), k3, w13 = left(w13 ^ w10 ^ w5 ^ w15));
Round(e, a, b, c, d, f3(a, b, c), k3, w14 = left(w14 ^ w11 ^ w6 ^ w0 ));
Round(d, e, a, b, c, f3(e, a, b), k3, w15 = left(w15 ^ w12 ^ w7 ^ w1 ));
Round(c, d, e, a, b, f3(d, e, a), k3, w0 = left(w0 ^ w13 ^ w8 ^ w2 ));
Round(b, c, d, e, a, f3(c, d, e), k3, w1 = left(w1 ^ w14 ^ w9 ^ w3 ));
Round(a, b, c, d, e, f3(b, c, d), k3, w2 = left(w2 ^ w15 ^ w10 ^ w4 ));
Round(e, a, b, c, d, f3(a, b, c), k3, w3 = left(w3 ^ w0 ^ w11 ^ w5 ));
Round(d, e, a, b, c, f3(e, a, b), k3, w4 = left(w4 ^ w1 ^ w12 ^ w6 ));
Round(c, d, e, a, b, f3(d, e, a), k3, w5 = left(w5 ^ w2 ^ w13 ^ w7 ));
Round(b, c, d, e, a, f3(c, d, e), k3, w6 = left(w6 ^ w3 ^ w14 ^ w8 ));
Round(a, b, c, d, e, f3(b, c, d), k3, w7 = left(w7 ^ w4 ^ w15 ^ w9 ));
Round(e, a, b, c, d, f3(a, b, c), k3, w8 = left(w8 ^ w5 ^ w0 ^ w10));
Round(d, e, a, b, c, f3(e, a, b), k3, w9 = left(w9 ^ w6 ^ w1 ^ w11));
Round(c, d, e, a, b, f3(d, e, a), k3, w10 = left(w10 ^ w7 ^ w2 ^ w12));
Round(b, c, d, e, a, f3(c, d, e), k3, w11 = left(w11 ^ w8 ^ w3 ^ w13));
Round(a, b, c, d, e, f2(b, c, d), k4, w12 = left(w12 ^ w9 ^ w4 ^ w14));
Round(e, a, b, c, d, f2(a, b, c), k4, w13 = left(w13 ^ w10 ^ w5 ^ w15));
Round(d, e, a, b, c, f2(e, a, b), k4, w14 = left(w14 ^ w11 ^ w6 ^ w0 ));
Round(c, d, e, a, b, f2(d, e, a), k4, w15 = left(w15 ^ w12 ^ w7 ^ w1 ));
Round(b, c, d, e, a, f2(c, d, e), k4, w0 = left(w0 ^ w13 ^ w8 ^ w2 ));
Round(a, b, c, d, e, f2(b, c, d), k4, w1 = left(w1 ^ w14 ^ w9 ^ w3 ));
Round(e, a, b, c, d, f2(a, b, c), k4, w2 = left(w2 ^ w15 ^ w10 ^ w4 ));
Round(d, e, a, b, c, f2(e, a, b), k4, w3 = left(w3 ^ w0 ^ w11 ^ w5 ));
Round(c, d, e, a, b, f2(d, e, a), k4, w4 = left(w4 ^ w1 ^ w12 ^ w6 ));
Round(b, c, d, e, a, f2(c, d, e), k4, w5 = left(w5 ^ w2 ^ w13 ^ w7 ));
Round(a, b, c, d, e, f2(b, c, d), k4, w6 = left(w6 ^ w3 ^ w14 ^ w8 ));
Round(e, a, b, c, d, f2(a, b, c), k4, w7 = left(w7 ^ w4 ^ w15 ^ w9 ));
Round(d, e, a, b, c, f2(e, a, b), k4, w8 = left(w8 ^ w5 ^ w0 ^ w10));
Round(c, d, e, a, b, f2(d, e, a), k4, w9 = left(w9 ^ w6 ^ w1 ^ w11));
Round(b, c, d, e, a, f2(c, d, e), k4, w10 = left(w10 ^ w7 ^ w2 ^ w12));
Round(a, b, c, d, e, f2(b, c, d), k4, w11 = left(w11 ^ w8 ^ w3 ^ w13));
Round(e, a, b, c, d, f2(a, b, c), k4, w12 = left(w12 ^ w9 ^ w4 ^ w14));
Round(d, e, a, b, c, f2(e, a, b), k4, left(w13 ^ w10 ^ w5 ^ w15));
Round(c, d, e, a, b, f2(d, e, a), k4, left(w14 ^ w11 ^ w6 ^ w0 ));
Round(b, c, d, e, a, f2(c, d, e), k4, left(w15 ^ w12 ^ w7 ^ w1 ));
s[0] += a;
s[1] += b;
s[2] += c;
s[3] += d;
s[4] += e;
}
} // namespace sha1
} // namespace
////// SHA1
CSHA1::CSHA1() : bytes(0) {
sha1::Initialize(s);
}
CSHA1& CSHA1::Write(const unsigned char *data, size_t len) {
const unsigned char *end = data + len;
size_t bufsize = bytes % 64;
if (bufsize && bufsize + len >= 64) {
// Fill the buffer, and process it.
memcpy(buf + bufsize, data, 64 - bufsize);
bytes += 64 - bufsize;
data += 64 - bufsize;
sha1::Transform(s, buf);
bufsize = 0;
}
while (end >= data + 64) {
// Process full chunks directly from the source.
sha1::Transform(s, data);
bytes += 64;
data += 64;
}
if (end > data) {
// Fill the buffer with what remains.
memcpy(buf + bufsize, data, end - data);
bytes += end - data;
}
return *this;
}
void CSHA1::Finalize(unsigned char *hash) {
static const unsigned char pad[64] = {0x80};
unsigned char sizedesc[8];
WriteBE32(sizedesc, bytes >> 29);
WriteBE32(sizedesc+4, bytes << 3);
Write(pad, 1 + ((119 - (bytes % 64)) % 64));
Write(sizedesc, 8);
WriteBE32(hash, s[0]);
WriteBE32(hash+4, s[1]);
WriteBE32(hash+8, s[2]);
WriteBE32(hash+12, s[3]);
WriteBE32(hash+16, s[4]);
}
CSHA1& CSHA1::Reset() {
bytes = 0;
sha1::Initialize(s);
return *this;
}
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