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#include <cstring>
#include <tr1/cstdint>
#include "security_sha_digest.h" // voir plus bas
namespace ekogen { namespace security {
namespace
{
typedef std::tr1::uint32_t uint32_t;
typedef std::tr1::uint64_t uint64_t;
inline unsigned int rotleft(uint32_t value, int shift)
{
if ((shift &= 31) == 0) return value;
return (value << shift) | (value >> (32 - shift));
}
inline unsigned int rotright(uint32_t value, int shift)
{
if ((shift &= 31) == 0) return value;
return (value >> shift) | (value << (32 - shift));
}
}
#define BSWAP32(x) (((uint32_t)(x) << 24) | \
((uint32_t)(x) >> 24) | \
(((uint32_t)(x) << 8) & 0xff0000L) | \
(((uint32_t)(x) >> 8) & 0xff00L))
#define BSWAP64(x) (((uint64_t)(x) << 56) | \
(((uint64_t)(x) << 40) & 0xff000000000000ULL) | \
(((uint64_t)(x) << 24) & 0xff0000000000ULL) | \
(((uint64_t)(x) << 8) & 0xff00000000ULL) | \
(((uint64_t)(x) >> 8) & 0xff000000ULL) | \
(((uint64_t)(x) >> 24) & 0xff0000ULL) | \
(((uint64_t)(x) >> 40) & 0xff00ULL) | \
((uint64_t)(x) >> 56))
// SHA-256 constants
namespace constants {
const uint32_t h0 = (0x6a09e667);
const uint32_t h1 = (0xbb67ae85);
const uint32_t h2 = (0x3c6ef372);
const uint32_t h3 = (0xa54ff53a);
const uint32_t h4 = (0x510e527f);
const uint32_t h5 = (0x9b05688c);
const uint32_t h6 = (0x1f83d9ab);
const uint32_t h7 = (0x5be0cd19);
const uint32_t k[64] =
{
(0x428a2f98), (0x71374491), (0xb5c0fbcf), (0xe9b5dba5),
(0x3956c25b), (0x59f111f1), (0x923f82a4), (0xab1c5ed5),
(0xd807aa98), (0x12835b01), (0x243185be), (0x550c7dc3),
(0x72be5d74), (0x80deb1fe), (0x9bdc06a7), (0xc19bf174),
(0xe49b69c1), (0xefbe4786), (0x0fc19dc6), (0x240ca1cc),
(0x2de92c6f), (0x4a7484aa), (0x5cb0a9dc), (0x76f988da),
(0x983e5152), (0xa831c66d), (0xb00327c8), (0xbf597fc7),
(0xc6e00bf3), (0xd5a79147), (0x06ca6351), (0x14292967),
(0x27b70a85), (0x2e1b2138), (0x4d2c6dfc), (0x53380d13),
(0x650a7354), (0x766a0abb), (0x81c2c92e), (0x92722c85),
(0xa2bfe8a1), (0xa81a664b), (0xc24b8b70), (0xc76c51a3),
(0xd192e819), (0xd6990624), (0xf40e3585), (0x106aa070),
(0x19a4c116), (0x1e376c08), (0x2748774c), (0x34b0bcb5),
(0x391c0cb3), (0x4ed8aa4a), (0x5b9cca4f), (0x682e6ff3),
(0x748f82ee), (0x78a5636f), (0x84c87814), (0x8cc70208),
(0x90befffa), (0xa4506ceb), (0xbef9a3f7), (0xc67178f2)
};
}
namespace details {
inline uint32_t ch(uint32_t x, uint32_t y, uint32_t z)
{
return (x & y) ^ (~x & z);
}
inline uint32_t maj(uint32_t x, uint32_t y, uint32_t z)
{
return (x & y) ^ (x & z) ^ (y & z);
}
inline uint32_t sigma0(uint32_t x)
{
return rotright(x, 2) ^ rotright(x, 13) ^ rotright(x, 22);
}
inline uint32_t sigma1(uint32_t x)
{
return rotright(x, 6) ^ rotright(x, 11) ^ rotright(x, 25);
}
inline uint32_t s0(uint32_t x)
{
return rotright(x, 7) ^ rotright(x, 18) ^ (x >> 3);
}
inline uint32_t s1(uint32_t x)
{
return rotright(x, 17) ^ rotright(x, 19) ^ (x >> 10);
}
inline void cycle(const uint32_t* w, std::size_t round,
uint32_t& a, uint32_t& b, uint32_t& c, uint32_t& d,
uint32_t& e, uint32_t& f, uint32_t& g, uint32_t& h)
{
uint32_t t1 = h + sigma1(e) + ch(e,f,g) + constants::k[round] + w[round];
uint32_t t2 = sigma0(a) + maj(a,b,c);
h = g;
g = f;
f = e;
e = d + t1;
d = c;
c = b;
b = a;
a = t1 + t2;
}
void do_rounds(const uint32_t*w, uint32_t* hash, std::size_t round_count)
{
for (std::size_t round=0; round < round_count; ++round)
{
uint32_t a = hash[0];
uint32_t b = hash[1];
uint32_t c = hash[2];
uint32_t d = hash[3];
uint32_t e = hash[4];
uint32_t f = hash[5];
uint32_t g = hash[6];
uint32_t h = hash[7];
details::cycle(w, round, a, b, c, d, e, f, g, h);
hash[0] += a;
hash[1] += b;
hash[2] += c;
hash[3] += d;
hash[4] += e;
hash[5] += f;
hash[6] += g;
hash[7] += h;
}
}
void prepare(const unsigned char* in, std::size_t length, std::size_t full_length, uint32_t* w)
{
if (length < 64)
{
memcpy(w, in, length);
unsigned char* wc = reinterpret_cast<unsigned char*>(w);
wc[length] = 0x80;
for (std::size_t i=length; i<56; ++i)
{
wc[i] = 0;
}
for (std::size_t i=0; i<14; ++i)
{
w[i] = BSWAP32(w[i]);
}
uint64_t* w64 = reinterpret_cast<uint64_t*>(w);
w64[7] = BSWAP64(full_length * 8);
}
else
{
const uint32_t* in32 = reinterpret_cast<const uint32_t*>(in);
for (std::size_t i=0; i<16; ++i)
{
w[i] = BSWAP32(in32[i]);
}
}
for (std::size_t r = 16; r < 64; ++r)
{
w[r] = s1(w[r-2]) + w[r-7] + s0(w[r-15]) + w[r-16];
}
}
}
void sha256(const unsigned char* in, std::size_t length, std::vector<unsigned char>& output)
{
const std::size_t chunk_size = 512 / 8;
const std::size_t round_count = 64;
// 1. prepare output
std::vector<unsigned char>(32).swap(output);
// 2. initialize
uint32_t hash[8] =
{
constants::h0,
constants::h1,
constants::h2,
constants::h3,
constants::h4,
constants::h5,
constants::h6,
constants::h7
};
uint32_t w[round_count] = { 0 };
std::size_t chunk;
// 3. first part of the algorithm: all chunks except the last one
for (chunk = 0; chunk + chunk_size < length; chunk += chunk_size)
{
details::prepare(in + chunk, chunk_size, length, w);
details::do_rounds(w, hash, round_count);
}
// final round
details::prepare(in + chunk, length - chunk_size, length, w);
details::do_rounds(w, hash, round_count);
unsigned char* huc = reinterpret_cast<unsigned char*>(hash);
std::copy(huc, huc + sizeof(hash), output.begin());
}
} } |
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