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path: root/src/crypto/ripemd160.cpp
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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/ripemd160.h"

#include <string.h>

// Internal implementation code.
namespace {

/** Read 4 bytes, and interpret them as a 32-bit unsigned little-endian integer. */
uint32_t inline ReadLE32(const unsigned char *data) {
    return ((uint32_t)data[0] | (uint32_t)data[1] << 8 | (uint32_t)data[2] << 16 | (uint32_t)data[3] << 24);
}

/** Write a 32-bit unsigned little-endian integer. */
void inline WriteLE32(unsigned char *data, uint32_t x) {
    data[0] = x;
    data[1] = x >> 8;
    data[2] = x >> 16;
    data[3] = x >> 24;
}

/// Internal RIPEMD-160 implementation.
namespace ripemd160 {

uint32_t inline f1(uint32_t x, uint32_t y, uint32_t z) { return x ^ y ^ z; }
uint32_t inline f2(uint32_t x, uint32_t y, uint32_t z) { return (x & y) | (~x & z); }
uint32_t inline f3(uint32_t x, uint32_t y, uint32_t z) { return (x | ~y) ^ z; }
uint32_t inline f4(uint32_t x, uint32_t y, uint32_t z) { return (x & z) | (y & ~z); }
uint32_t inline f5(uint32_t x, uint32_t y, uint32_t z) { return x ^ (y | ~z); }

/** Initialize RIPEMD-160 state. */
void inline Initialize(uint32_t *s) {
    s[0] = 0x67452301ul;
    s[1] = 0xEFCDAB89ul;
    s[2] = 0x98BADCFEul;
    s[3] = 0x10325476ul;
    s[4] = 0xC3D2E1F0ul;
}

uint32_t inline rol(uint32_t x, int i) { return (x << i) | (x >> (32-i)); }

void inline Round(uint32_t &a, uint32_t b, uint32_t &c, uint32_t d, uint32_t e, uint32_t f, uint32_t x, uint32_t k, int r) {
    a = rol(a + f + x + k, r) + e;
    c = rol(c, 10);
}

void inline R11(uint32_t &a, uint32_t b, uint32_t &c, uint32_t d, uint32_t e, uint32_t x, int r) { Round(a, b, c, d, e, f1(b, c, d), x,            0, r); }
void inline R21(uint32_t &a, uint32_t b, uint32_t &c, uint32_t d, uint32_t e, uint32_t x, int r) { Round(a, b, c, d, e, f2(b, c, d), x, 0x5A827999ul, r); }
void inline R31(uint32_t &a, uint32_t b, uint32_t &c, uint32_t d, uint32_t e, uint32_t x, int r) { Round(a, b, c, d, e, f3(b, c, d), x, 0x6ED9EBA1ul, r); }
void inline R41(uint32_t &a, uint32_t b, uint32_t &c, uint32_t d, uint32_t e, uint32_t x, int r) { Round(a, b, c, d, e, f4(b, c, d), x, 0x8F1BBCDCul, r); }
void inline R51(uint32_t &a, uint32_t b, uint32_t &c, uint32_t d, uint32_t e, uint32_t x, int r) { Round(a, b, c, d, e, f5(b, c, d), x, 0xA953FD4Eul, r); }

void inline R12(uint32_t &a, uint32_t b, uint32_t &c, uint32_t d, uint32_t e, uint32_t x, int r) { Round(a, b, c, d, e, f5(b, c, d), x, 0x50A28BE6ul, r); }
void inline R22(uint32_t &a, uint32_t b, uint32_t &c, uint32_t d, uint32_t e, uint32_t x, int r) { Round(a, b, c, d, e, f4(b, c, d), x, 0x5C4DD124ul, r); }
void inline R32(uint32_t &a, uint32_t b, uint32_t &c, uint32_t d, uint32_t e, uint32_t x, int r) { Round(a, b, c, d, e, f3(b, c, d), x, 0x6D703EF3ul, r); }
void inline R42(uint32_t &a, uint32_t b, uint32_t &c, uint32_t d, uint32_t e, uint32_t x, int r) { Round(a, b, c, d, e, f2(b, c, d), x, 0x7A6D76E9ul, r); }
void inline R52(uint32_t &a, uint32_t b, uint32_t &c, uint32_t d, uint32_t e, uint32_t x, int r) { Round(a, b, c, d, e, f1(b, c, d), x,            0, r); }

/** Perform a RIPEMD-160 transformation, processing a 64-byte chunk. */
void Transform(uint32_t *s, const unsigned char *chunk) {
    uint32_t a1 = s[0], b1 = s[1], c1 = s[2], d1 = s[3], e1 = s[4];
    uint32_t a2 = a1  , b2 = b1  , c2 = c1  , d2 = d1  , e2 = e1  ;
    uint32_t w0  = ReadLE32(chunk +  0), w1  = ReadLE32(chunk +  4), w2  = ReadLE32(chunk +  8), w3  = ReadLE32(chunk + 12);
    uint32_t w4  = ReadLE32(chunk + 16), w5  = ReadLE32(chunk + 20), w6  = ReadLE32(chunk + 24), w7  = ReadLE32(chunk + 28);
    uint32_t w8  = ReadLE32(chunk + 32), w9  = ReadLE32(chunk + 36), w10 = ReadLE32(chunk + 40), w11 = ReadLE32(chunk + 44);
    uint32_t w12 = ReadLE32(chunk + 48), w13 = ReadLE32(chunk + 52), w14 = ReadLE32(chunk + 56), w15 = ReadLE32(chunk + 60);

    R11(a1, b1, c1, d1, e1, w0 , 11); R12(a2, b2, c2, d2, e2, w5 ,  8);
    R11(e1, a1, b1, c1, d1, w1 , 14); R12(e2, a2, b2, c2, d2, w14,  9);
    R11(d1, e1, a1, b1, c1, w2 , 15); R12(d2, e2, a2, b2, c2, w7 ,  9);
    R11(c1, d1, e1, a1, b1, w3 , 12); R12(c2, d2, e2, a2, b2, w0 , 11);
    R11(b1, c1, d1, e1, a1, w4 ,  5); R12(b2, c2, d2, e2, a2, w9 , 13);
    R11(a1, b1, c1, d1, e1, w5 ,  8); R12(a2, b2, c2, d2, e2, w2 , 15);
    R11(e1, a1, b1, c1, d1, w6 ,  7); R12(e2, a2, b2, c2, d2, w11, 15);
    R11(d1, e1, a1, b1, c1, w7 ,  9); R12(d2, e2, a2, b2, c2, w4 ,  5);
    R11(c1, d1, e1, a1, b1, w8 , 11); R12(c2, d2, e2, a2, b2, w13,  7);
    R11(b1, c1, d1, e1, a1, w9 , 13); R12(b2, c2, d2, e2, a2, w6 ,  7);
    R11(a1, b1, c1, d1, e1, w10, 14); R12(a2, b2, c2, d2, e2, w15,  8);
    R11(e1, a1, b1, c1, d1, w11, 15); R12(e2, a2, b2, c2, d2, w8 , 11);
    R11(d1, e1, a1, b1, c1, w12,  6); R12(d2, e2, a2, b2, c2, w1 , 14);
    R11(c1, d1, e1, a1, b1, w13,  7); R12(c2, d2, e2, a2, b2, w10, 14);
    R11(b1, c1, d1, e1, a1, w14,  9); R12(b2, c2, d2, e2, a2, w3 , 12);
    R11(a1, b1, c1, d1, e1, w15,  8); R12(a2, b2, c2, d2, e2, w12,  6);

    R21(e1, a1, b1, c1, d1, w7 ,  7); R22(e2, a2, b2, c2, d2, w6 ,  9);
    R21(d1, e1, a1, b1, c1, w4 ,  6); R22(d2, e2, a2, b2, c2, w11, 13);
    R21(c1, d1, e1, a1, b1, w13,  8); R22(c2, d2, e2, a2, b2, w3 , 15);
    R21(b1, c1, d1, e1, a1, w1 , 13); R22(b2, c2, d2, e2, a2, w7 ,  7);
    R21(a1, b1, c1, d1, e1, w10, 11); R22(a2, b2, c2, d2, e2, w0 , 12);
    R21(e1, a1, b1, c1, d1, w6 ,  9); R22(e2, a2, b2, c2, d2, w13,  8);
    R21(d1, e1, a1, b1, c1, w15,  7); R22(d2, e2, a2, b2, c2, w5 ,  9);
    R21(c1, d1, e1, a1, b1, w3 , 15); R22(c2, d2, e2, a2, b2, w10, 11);
    R21(b1, c1, d1, e1, a1, w12,  7); R22(b2, c2, d2, e2, a2, w14,  7);
    R21(a1, b1, c1, d1, e1, w0 , 12); R22(a2, b2, c2, d2, e2, w15,  7);
    R21(e1, a1, b1, c1, d1, w9 , 15); R22(e2, a2, b2, c2, d2, w8 , 12);
    R21(d1, e1, a1, b1, c1, w5 ,  9); R22(d2, e2, a2, b2, c2, w12,  7);
    R21(c1, d1, e1, a1, b1, w2 , 11); R22(c2, d2, e2, a2, b2, w4 ,  6);
    R21(b1, c1, d1, e1, a1, w14,  7); R22(b2, c2, d2, e2, a2, w9 , 15);
    R21(a1, b1, c1, d1, e1, w11, 13); R22(a2, b2, c2, d2, e2, w1 , 13);
    R21(e1, a1, b1, c1, d1, w8 , 12); R22(e2, a2, b2, c2, d2, w2 , 11);

    R31(d1, e1, a1, b1, c1, w3 , 11); R32(d2, e2, a2, b2, c2, w15,  9);
    R31(c1, d1, e1, a1, b1, w10, 13); R32(c2, d2, e2, a2, b2, w5 ,  7);
    R31(b1, c1, d1, e1, a1, w14,  6); R32(b2, c2, d2, e2, a2, w1 , 15);
    R31(a1, b1, c1, d1, e1, w4 ,  7); R32(a2, b2, c2, d2, e2, w3 , 11);
    R31(e1, a1, b1, c1, d1, w9 , 14); R32(e2, a2, b2, c2, d2, w7 ,  8);
    R31(d1, e1, a1, b1, c1, w15,  9); R32(d2, e2, a2, b2, c2, w14,  6);
    R31(c1, d1, e1, a1, b1, w8 , 13); R32(c2, d2, e2, a2, b2, w6 ,  6);
    R31(b1, c1, d1, e1, a1, w1 , 15); R32(b2, c2, d2, e2, a2, w9 , 14);
    R31(a1, b1, c1, d1, e1, w2 , 14); R32(a2, b2, c2, d2, e2, w11, 12);
    R31(e1, a1, b1, c1, d1, w7 ,  8); R32(e2, a2, b2, c2, d2, w8 , 13);
    R31(d1, e1, a1, b1, c1, w0 , 13); R32(d2, e2, a2, b2, c2, w12,  5);
    R31(c1, d1, e1, a1, b1, w6 ,  6); R32(c2, d2, e2, a2, b2, w2 , 14);
    R31(b1, c1, d1, e1, a1, w13,  5); R32(b2, c2, d2, e2, a2, w10, 13);
    R31(a1, b1, c1, d1, e1, w11, 12); R32(a2, b2, c2, d2, e2, w0 , 13);
    R31(e1, a1, b1, c1, d1, w5 ,  7); R32(e2, a2, b2, c2, d2, w4 ,  7);
    R31(d1, e1, a1, b1, c1, w12,  5); R32(d2, e2, a2, b2, c2, w13,  5);

    R41(c1, d1, e1, a1, b1, w1 , 11); R42(c2, d2, e2, a2, b2, w8 , 15);
    R41(b1, c1, d1, e1, a1, w9 , 12); R42(b2, c2, d2, e2, a2, w6 ,  5);
    R41(a1, b1, c1, d1, e1, w11, 14); R42(a2, b2, c2, d2, e2, w4 ,  8);
    R41(e1, a1, b1, c1, d1, w10, 15); R42(e2, a2, b2, c2, d2, w1 , 11);
    R41(d1, e1, a1, b1, c1, w0 , 14); R42(d2, e2, a2, b2, c2, w3 , 14);
    R41(c1, d1, e1, a1, b1, w8 , 15); R42(c2, d2, e2, a2, b2, w11, 14);
    R41(b1, c1, d1, e1, a1, w12,  9); R42(b2, c2, d2, e2, a2, w15,  6);
    R41(a1, b1, c1, d1, e1, w4 ,  8); R42(a2, b2, c2, d2, e2, w0 , 14);
    R41(e1, a1, b1, c1, d1, w13,  9); R42(e2, a2, b2, c2, d2, w5 ,  6);
    R41(d1, e1, a1, b1, c1, w3 , 14); R42(d2, e2, a2, b2, c2, w12,  9);
    R41(c1, d1, e1, a1, b1, w7 ,  5); R42(c2, d2, e2, a2, b2, w2 , 12);
    R41(b1, c1, d1, e1, a1, w15,  6); R42(b2, c2, d2, e2, a2, w13,  9);
    R41(a1, b1, c1, d1, e1, w14,  8); R42(a2, b2, c2, d2, e2, w9 , 12);
    R41(e1, a1, b1, c1, d1, w5 ,  6); R42(e2, a2, b2, c2, d2, w7 ,  5);
    R41(d1, e1, a1, b1, c1, w6 ,  5); R42(d2, e2, a2, b2, c2, w10, 15);
    R41(c1, d1, e1, a1, b1, w2 , 12); R42(c2, d2, e2, a2, b2, w14,  8);

    R51(b1, c1, d1, e1, a1, w4 ,  9); R52(b2, c2, d2, e2, a2, w12,  8);
    R51(a1, b1, c1, d1, e1, w0 , 15); R52(a2, b2, c2, d2, e2, w15,  5);
    R51(e1, a1, b1, c1, d1, w5 ,  5); R52(e2, a2, b2, c2, d2, w10, 12);
    R51(d1, e1, a1, b1, c1, w9 , 11); R52(d2, e2, a2, b2, c2, w4 ,  9);
    R51(c1, d1, e1, a1, b1, w7 ,  6); R52(c2, d2, e2, a2, b2, w1 , 12);
    R51(b1, c1, d1, e1, a1, w12,  8); R52(b2, c2, d2, e2, a2, w5 ,  5);
    R51(a1, b1, c1, d1, e1, w2 , 13); R52(a2, b2, c2, d2, e2, w8 , 14);
    R51(e1, a1, b1, c1, d1, w10, 12); R52(e2, a2, b2, c2, d2, w7 ,  6);
    R51(d1, e1, a1, b1, c1, w14,  5); R52(d2, e2, a2, b2, c2, w6 ,  8);
    R51(c1, d1, e1, a1, b1, w1 , 12); R52(c2, d2, e2, a2, b2, w2 , 13);
    R51(b1, c1, d1, e1, a1, w3 , 13); R52(b2, c2, d2, e2, a2, w13,  6);
    R51(a1, b1, c1, d1, e1, w8 , 14); R52(a2, b2, c2, d2, e2, w14,  5);
    R51(e1, a1, b1, c1, d1, w11, 11); R52(e2, a2, b2, c2, d2, w0 , 15);
    R51(d1, e1, a1, b1, c1, w6 ,  8); R52(d2, e2, a2, b2, c2, w3 , 13);
    R51(c1, d1, e1, a1, b1, w15,  5); R52(c2, d2, e2, a2, b2, w9 , 11);
    R51(b1, c1, d1, e1, a1, w13,  6); R52(b2, c2, d2, e2, a2, w11, 11);

    uint32_t t = s[0];
    s[0] = s[1] + c1 + d2;
    s[1] = s[2] + d1 + e2;
    s[2] = s[3] + e1 + a2;
    s[3] = s[4] + a1 + b2;
    s[4] = t    + b1 + c2;
}

}  // namespace ripemd160

}  // namespace

////// RIPEMD160

CRIPEMD160::CRIPEMD160() : bytes(0) {
    ripemd160::Initialize(s);
}

CRIPEMD160& CRIPEMD160::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;
        ripemd160::Transform(s, buf);
        bufsize = 0;
    }
    while (end >= data + 64) {
        // Process full chunks directly from the source.
        ripemd160::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 CRIPEMD160::Finalize(unsigned char *hash) {
    static const unsigned char pad[64] = {0x80};
    unsigned char sizedesc[8];
    WriteLE32(sizedesc, bytes << 3);
    WriteLE32(sizedesc+4, bytes >> 29);
    Write(pad, 1 + ((119 - (bytes % 64)) % 64));
    Write(sizedesc, 8);
    WriteLE32(hash, s[0]);
    WriteLE32(hash+4, s[1]);
    WriteLE32(hash+8, s[2]);
    WriteLE32(hash+12, s[3]);
    WriteLE32(hash+16, s[4]);
}

CRIPEMD160& CRIPEMD160::Reset() {
    bytes = 0;
    ripemd160::Initialize(s);
    return *this;
}