260 lines
8.6 KiB
C++
260 lines
8.6 KiB
C++
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/*
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==============================================================================
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This file is part of the JUCE library.
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Copyright (c) 2020 - Raw Material Software Limited
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JUCE is an open source library subject to commercial or open-source
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licensing.
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By using JUCE, you agree to the terms of both the JUCE 6 End-User License
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Agreement and JUCE Privacy Policy (both effective as of the 16th June 2020).
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End User License Agreement: www.juce.com/juce-6-licence
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Privacy Policy: www.juce.com/juce-privacy-policy
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Or: You may also use this code under the terms of the GPL v3 (see
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www.gnu.org/licenses).
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JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
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EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
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DISCLAIMED.
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==============================================================================
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*/
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namespace juce
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{
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struct SHA256Processor
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{
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// expects 64 bytes of data
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void processFullBlock (const void* data) noexcept
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{
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const uint32_t constants[] =
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{
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0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
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0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
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0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
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0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
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0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
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0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
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0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
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0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
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};
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uint32_t block[16], s[8];
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memcpy (s, state, sizeof (s));
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auto d = static_cast<const uint8_t*> (data);
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for (auto& b : block)
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{
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b = (uint32_t (d[0]) << 24) | (uint32_t (d[1]) << 16) | (uint32_t (d[2]) << 8) | d[3];
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d += 4;
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}
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auto convolve = [&] (uint32_t i, uint32_t j)
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{
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s[(7 - i) & 7] += S1 (s[(4 - i) & 7]) + ch (s[(4 - i) & 7], s[(5 - i) & 7], s[(6 - i) & 7]) + constants[i + j]
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+ (j != 0 ? (block[i & 15] += s1 (block[(i - 2) & 15]) + block[(i - 7) & 15] + s0 (block[(i - 15) & 15]))
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: block[i]);
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s[(3 - i) & 7] += s[(7 - i) & 7];
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s[(7 - i) & 7] += S0 (s[(0 - i) & 7]) + maj (s[(0 - i) & 7], s[(1 - i) & 7], s[(2 - i) & 7]);
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};
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for (uint32_t j = 0; j < 64; j += 16)
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for (uint32_t i = 0; i < 16; ++i)
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convolve (i, j);
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for (int i = 0; i < 8; ++i)
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state[i] += s[i];
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length += 64;
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}
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void processFinalBlock (const void* data, uint32_t numBytes) noexcept
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{
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jassert (numBytes < 64);
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length += numBytes;
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length *= 8; // (the length is stored as a count of bits, not bytes)
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uint8_t finalBlocks[128];
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memcpy (finalBlocks, data, numBytes);
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finalBlocks[numBytes++] = 128; // append a '1' bit
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while (numBytes != 56 && numBytes < 64 + 56)
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finalBlocks[numBytes++] = 0; // pad with zeros..
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for (int i = 8; --i >= 0;)
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finalBlocks[numBytes++] = (uint8_t) (length >> (i * 8)); // append the length.
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jassert (numBytes == 64 || numBytes == 128);
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processFullBlock (finalBlocks);
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if (numBytes > 64)
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processFullBlock (finalBlocks + 64);
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}
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void copyResult (uint8_t* result) const noexcept
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{
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for (auto s : state)
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{
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*result++ = (uint8_t) (s >> 24);
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*result++ = (uint8_t) (s >> 16);
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*result++ = (uint8_t) (s >> 8);
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*result++ = (uint8_t) s;
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}
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}
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void processStream (InputStream& input, int64_t numBytesToRead, uint8_t* result)
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{
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if (numBytesToRead < 0)
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numBytesToRead = std::numeric_limits<int64_t>::max();
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for (;;)
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{
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uint8_t buffer[64];
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auto bytesRead = input.read (buffer, (int) jmin (numBytesToRead, (int64_t) sizeof (buffer)));
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if (bytesRead < (int) sizeof (buffer))
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{
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processFinalBlock (buffer, (unsigned int) bytesRead);
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break;
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}
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numBytesToRead -= (int64_t) sizeof (buffer);
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processFullBlock (buffer);
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}
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copyResult (result);
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}
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private:
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uint32_t state[8] = { 0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a,
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0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19 };
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uint64_t length = 0;
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static uint32_t rotate (uint32_t x, uint32_t y) noexcept { return (x >> y) | (x << (32 - y)); }
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static uint32_t ch (uint32_t x, uint32_t y, uint32_t z) noexcept { return z ^ ((y ^ z) & x); }
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static uint32_t maj (uint32_t x, uint32_t y, uint32_t z) noexcept { return y ^ ((y ^ z) & (x ^ y)); }
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static uint32_t s0 (uint32_t x) noexcept { return rotate (x, 7) ^ rotate (x, 18) ^ (x >> 3); }
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static uint32_t s1 (uint32_t x) noexcept { return rotate (x, 17) ^ rotate (x, 19) ^ (x >> 10); }
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static uint32_t S0 (uint32_t x) noexcept { return rotate (x, 2) ^ rotate (x, 13) ^ rotate (x, 22); }
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static uint32_t S1 (uint32_t x) noexcept { return rotate (x, 6) ^ rotate (x, 11) ^ rotate (x, 25); }
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};
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//==============================================================================
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SHA256::SHA256() = default;
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SHA256::~SHA256() = default;
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SHA256::SHA256 (const SHA256&) = default;
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SHA256& SHA256::operator= (const SHA256&) = default;
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SHA256::SHA256 (const MemoryBlock& data)
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{
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process (data.getData(), data.getSize());
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}
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SHA256::SHA256 (const void* data, size_t numBytes)
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{
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process (data, numBytes);
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}
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SHA256::SHA256 (InputStream& input, int64 numBytesToRead)
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{
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SHA256Processor processor;
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processor.processStream (input, numBytesToRead, result);
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}
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SHA256::SHA256 (const File& file)
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{
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FileInputStream fin (file);
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if (fin.getStatus().wasOk())
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{
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SHA256Processor processor;
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processor.processStream (fin, -1, result);
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}
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else
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{
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zerostruct (result);
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}
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}
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SHA256::SHA256 (CharPointer_UTF8 utf8) noexcept
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{
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jassert (utf8.getAddress() != nullptr);
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process (utf8.getAddress(), utf8.sizeInBytes() - 1);
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}
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void SHA256::process (const void* data, size_t numBytes)
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{
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MemoryInputStream m (data, numBytes, false);
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SHA256Processor processor;
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processor.processStream (m, -1, result);
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}
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MemoryBlock SHA256::getRawData() const
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{
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return MemoryBlock (result, sizeof (result));
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}
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String SHA256::toHexString() const
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{
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return String::toHexString (result, sizeof (result), 0);
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}
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bool SHA256::operator== (const SHA256& other) const noexcept { return memcmp (result, other.result, sizeof (result)) == 0; }
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bool SHA256::operator!= (const SHA256& other) const noexcept { return ! operator== (other); }
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//==============================================================================
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#if JUCE_UNIT_TESTS
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class SHA256Tests : public UnitTest
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{
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public:
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SHA256Tests()
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: UnitTest ("SHA-256", UnitTestCategories::cryptography)
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{}
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void test (const char* input, const char* expected)
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{
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{
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SHA256 hash (input, strlen (input));
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expectEquals (hash.toHexString(), String (expected));
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}
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{
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CharPointer_UTF8 utf8 (input);
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SHA256 hash (utf8);
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expectEquals (hash.toHexString(), String (expected));
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}
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{
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MemoryInputStream m (input, strlen (input), false);
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SHA256 hash (m);
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expectEquals (hash.toHexString(), String (expected));
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}
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}
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void runTest() override
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{
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beginTest ("SHA256");
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test ("", "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855");
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test ("The quick brown fox jumps over the lazy dog", "d7a8fbb307d7809469ca9abcb0082e4f8d5651e46d3cdb762d02d0bf37c9e592");
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test ("The quick brown fox jumps over the lazy dog.", "ef537f25c895bfa782526529a9b63d97aa631564d5d789c2b765448c8635fb6c");
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}
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};
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static SHA256Tests sha256UnitTests;
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#endif
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} // namespace juce
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