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/*
* Copyright (C) 2011 Google Inc. All rights reserved.
* Copyright (C) 2015 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include <wtf/SHA1.h>
#include <wtf/Assertions.h>
#include <wtf/text/CString.h>
namespace WTF {
#if PLATFORM(COCOA)
SHA1::SHA1()
{
ALLOW_DEPRECATED_DECLARATIONS_BEGIN
CC_SHA1_Init(&m_context);
ALLOW_DEPRECATED_DECLARATIONS_END
}
void SHA1::addBytes(const uint8_t* input, size_t length)
{
ALLOW_DEPRECATED_DECLARATIONS_BEGIN
CC_SHA1_Update(&m_context, input, length);
ALLOW_DEPRECATED_DECLARATIONS_END
}
void SHA1::computeHash(Digest& hash)
{
ALLOW_DEPRECATED_DECLARATIONS_BEGIN
CC_SHA1_Final(hash.data(), &m_context);
ALLOW_DEPRECATED_DECLARATIONS_END
}
#else
// A straightforward SHA-1 implementation based on RFC 3174.
// http://www.ietf.org/rfc/rfc3174.txt
// The names of functions and variables (such as "a", "b", and "f") follow notations in RFC 3174.
static inline uint32_t f(int t, uint32_t b, uint32_t c, uint32_t d)
{
ASSERT(t >= 0 && t < 80);
if (t < 20)
return (b & c) | ((~b) & d);
if (t < 40)
return b ^ c ^ d;
if (t < 60)
return (b & c) | (b & d) | (c & d);
return b ^ c ^ d;
}
static inline uint32_t k(int t)
{
ASSERT(t >= 0 && t < 80);
if (t < 20)
return 0x5a827999;
if (t < 40)
return 0x6ed9eba1;
if (t < 60)
return 0x8f1bbcdc;
return 0xca62c1d6;
}
static inline uint32_t rotateLeft(int n, uint32_t x)
{
ASSERT(n >= 0 && n < 32);
return (x << n) | (x >> (32 - n));
}
SHA1::SHA1()
{
reset();
}
void SHA1::addBytes(const uint8_t* input, size_t length)
{
while (length--) {
ASSERT(m_cursor < 64);
m_buffer[m_cursor++] = *input++;
++m_totalBytes;
if (m_cursor == 64)
processBlock();
}
}
void SHA1::computeHash(Digest& digest)
{
finalize();
for (size_t i = 0; i < 5; ++i) {
// Treat hashValue as a big-endian value.
uint32_t hashValue = m_hash[i];
for (int j = 0; j < 4; ++j) {
digest[4 * i + (3 - j)] = hashValue & 0xFF;
hashValue >>= 8;
}
}
reset();
}
void SHA1::finalize()
{
ASSERT(m_cursor < 64);
m_buffer[m_cursor++] = 0x80;
if (m_cursor > 56) {
// Pad out to next block.
while (m_cursor < 64)
m_buffer[m_cursor++] = 0x00;
processBlock();
}
for (size_t i = m_cursor; i < 56; ++i)
m_buffer[i] = 0x00;
// Write the length as a big-endian 64-bit value.
uint64_t bits = m_totalBytes * 8;
for (int i = 0; i < 8; ++i) {
m_buffer[56 + (7 - i)] = bits & 0xFF;
bits >>= 8;
}
m_cursor = 64;
processBlock();
}
void SHA1::processBlock()
{
ASSERT(m_cursor == 64);
uint32_t w[80] = { 0 };
for (int t = 0; t < 16; ++t)
w[t] = (m_buffer[t * 4] << 24) | (m_buffer[t * 4 + 1] << 16) | (m_buffer[t * 4 + 2] << 8) | m_buffer[t * 4 + 3];
for (int t = 16; t < 80; ++t)
w[t] = rotateLeft(1, w[t - 3] ^ w[t - 8] ^ w[t - 14] ^ w[t - 16]);
uint32_t a = m_hash[0];
uint32_t b = m_hash[1];
uint32_t c = m_hash[2];
uint32_t d = m_hash[3];
uint32_t e = m_hash[4];
for (int t = 0; t < 80; ++t) {
uint32_t temp = rotateLeft(5, a) + f(t, b, c, d) + e + w[t] + k(t);
e = d;
d = c;
c = rotateLeft(30, b);
b = a;
a = temp;
}
m_hash[0] += a;
m_hash[1] += b;
m_hash[2] += c;
m_hash[3] += d;
m_hash[4] += e;
m_cursor = 0;
}
void SHA1::reset()
{
m_cursor = 0;
m_totalBytes = 0;
m_hash[0] = 0x67452301;
m_hash[1] = 0xefcdab89;
m_hash[2] = 0x98badcfe;
m_hash[3] = 0x10325476;
m_hash[4] = 0xc3d2e1f0;
// Clear the buffer after use in case it's sensitive.
memset(m_buffer, 0, sizeof(m_buffer));
}
#endif
CString SHA1::hexDigest(const Digest& digest)
{
char* start = nullptr;
CString result = CString::newUninitialized(40, start);
char* buffer = start;
for (size_t i = 0; i < hashSize; ++i) {
snprintf(buffer, 3, "%02X", digest.at(i));
buffer += 2;
}
return result;
}
CString SHA1::computeHexDigest()
{
Digest digest;
computeHash(digest);
return hexDigest(digest);
}
} // namespace WTF