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Add implementation of SHA-384 hash function
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| // Copyright © 2023 ZeroPass <zeropass@pm.me> | ||
| // Author: Crt Vavros | ||
| #pragma once | ||
| #include <array> | ||
| #include <cstdint> | ||
| #include <vector> | ||
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| #include <ack/types.hpp> | ||
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| #include <stddef.h> | ||
| #include <stdint.h> | ||
| #include <string.h> | ||
| #include <stdio.h> | ||
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| namespace ack { | ||
| namespace internal_do_not_use { | ||
| static_assert( sizeof( uint32_t ) == 4, "uint32_t must be 4 bytes" ); | ||
| static_assert( sizeof( uint64_t ) == 8, "uint64_t must be 8 bytes" ); | ||
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| constexpr inline size_t sha384_hash_size = 48; | ||
| using sha384_hash = fixed_bytes<sha384_hash_size>; | ||
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| constexpr inline size_t sha512_block_size = 128; | ||
| constexpr inline size_t sha512_hash_size = 64; | ||
| constexpr inline size_t sha512_padblock_size = 16; | ||
| constexpr inline size_t sha512_rounds = 80; | ||
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| using sha512_word_t = uint64_t; | ||
| using sha512_hash = fixed_bytes<sha512_hash_size>; | ||
| using sha512_word_hash = std::array<sha512_word_t, 8>; | ||
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| // NIST FIPS 180-4 Section 5.3.4 SHA-384 | ||
| constexpr inline sha512_word_hash sha384_initial_hash_values = { | ||
| 0xcbbb9d5dc1059ed8ULL, | ||
| 0x629a292a367cd507ULL, | ||
| 0x9159015a3070dd17ULL, | ||
| 0x152fecd8f70e5939ULL, | ||
| 0x67332667ffc00b31ULL, | ||
| 0x8eb44a8768581511ULL, | ||
| 0xdb0c2e0d64f98fa7ULL, | ||
| 0x47b5481dbefa4fa4ULL | ||
| }; | ||
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| constexpr sha512_word_t K_512[80] = { | ||
| 0x428a2f98d728ae22, 0x7137449123ef65cd, 0xb5c0fbcfec4d3b2f, 0xe9b5dba58189dbbc, | ||
| 0x3956c25bf348b538, 0x59f111f1b605d019, 0x923f82a4af194f9b, 0xab1c5ed5da6d8118, | ||
| 0xd807aa98a3030242, 0x12835b0145706fbe, 0x243185be4ee4b28c, 0x550c7dc3d5ffb4e2, | ||
| 0x72be5d74f27b896f, 0x80deb1fe3b1696b1, 0x9bdc06a725c71235, 0xc19bf174cf692694, | ||
| 0xe49b69c19ef14ad2, 0xefbe4786384f25e3, 0x0fc19dc68b8cd5b5, 0x240ca1cc77ac9c65, | ||
| 0x2de92c6f592b0275, 0x4a7484aa6ea6e483, 0x5cb0a9dcbd41fbd4, 0x76f988da831153b5, | ||
| 0x983e5152ee66dfab, 0xa831c66d2db43210, 0xb00327c898fb213f, 0xbf597fc7beef0ee4, | ||
| 0xc6e00bf33da88fc2, 0xd5a79147930aa725, 0x06ca6351e003826f, 0x142929670a0e6e70, | ||
| 0x27b70a8546d22ffc, 0x2e1b21385c26c926, 0x4d2c6dfc5ac42aed, 0x53380d139d95b3df, | ||
| 0x650a73548baf63de, 0x766a0abb3c77b2a8, 0x81c2c92e47edaee6, 0x92722c851482353b, | ||
| 0xa2bfe8a14cf10364, 0xa81a664bbc423001, 0xc24b8b70d0f89791, 0xc76c51a30654be30, | ||
| 0xd192e819d6ef5218, 0xd69906245565a910, 0xf40e35855771202a, 0x106aa07032bbd1b8, | ||
| 0x19a4c116b8d2d0c8, 0x1e376c085141ab53, 0x2748774cdf8eeb99, 0x34b0bcb5e19b48a8, | ||
| 0x391c0cb3c5c95a63, 0x4ed8aa4ae3418acb, 0x5b9cca4f7763e373, 0x682e6ff3d6b2b8a3, | ||
| 0x748f82ee5defb2fc, 0x78a5636f43172f60, 0x84c87814a1f0ab72, 0x8cc702081a6439ec, | ||
| 0x90befffa23631e28, 0xa4506cebde82bde9, 0xbef9a3f7b2c67915, 0xc67178f2e372532b, | ||
| 0xca273eceea26619c, 0xd186b8c721c0c207, 0xeada7dd6cde0eb1e, 0xf57d4f7fee6ed178, | ||
| 0x06f067aa72176fba, 0x0a637dc5a2c898a6, 0x113f9804bef90dae, 0x1b710b35131c471b, | ||
| 0x28db77f523047d84, 0x32caab7b40c72493, 0x3c9ebe0a15c9bebc, 0x431d67c49c100d4c, | ||
| 0x4cc5d4becb3e42b6, 0x597f299cfc657e2a, 0x5fcb6fab3ad6faec, 0x6c44198c4a475817 | ||
| }; | ||
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| constexpr inline void write_u64le(byte_t* dest, uint64_t x) | ||
| { | ||
| *dest++ = ( x >> 56 ) & 0xff; | ||
| *dest++ = ( x >> 48 ) & 0xff; | ||
| *dest++ = ( x >> 40 ) & 0xff; | ||
| *dest++ = ( x >> 32 ) & 0xff; | ||
| *dest++ = ( x >> 24 ) & 0xff; | ||
| *dest++ = ( x >> 16 ) & 0xff; | ||
| *dest++ = ( x >> 8 ) & 0xff; | ||
| *dest++ = ( x >> 0 ) & 0xff; | ||
| } | ||
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| constexpr inline uint32_t read_u32be(const byte_t* src) | ||
| { | ||
| return static_cast<uint32_t>( | ||
| ( src[0] << 24 ) | | ||
| ( src[1] << 16 ) | | ||
| ( src[2] << 8 ) | | ||
| ( src[3] << 0 ) | ||
| ); | ||
| } | ||
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| constexpr inline uint64_t read_u64be(const byte_t* src) | ||
| { | ||
| uint64_t upper = read_u32be( src ); | ||
| uint64_t lower = read_u32be( src + 4 ); | ||
| return ( ( upper & 0xffffffff ) << 32 ) | ( lower & 0xffffffff ); | ||
| } | ||
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| constexpr inline uint64_t ROTR(uint64_t x, uint64_t n) | ||
| { | ||
| // A compiler-recognised implementation of rotate right that avoids the | ||
| // undefined behaviour caused by shifting by the number of bits of the left-hand | ||
| // type. See John Regehr's article https://blog.regehr.org/archives/1063 | ||
| return ( x >> n ) | ( x << ( -n & 63 )); | ||
| } | ||
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| // NIST FIPS 180-4 Section 4.1.3 "SHA-384, SHA-512, SHA-512/224 and SHA-512/256 Functions" | ||
| constexpr inline uint64_t Ch(uint64_t x, uint64_t y, uint64_t z) { | ||
| return ( x & y ) ^ ( ~x & z ); | ||
| } | ||
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| // NIST FIPS 180-4 Section 4.1.3 "SHA-384, SHA-512, SHA-512/224 and SHA-512/256 Functions" | ||
| constexpr inline uint64_t Maj(uint64_t x, uint64_t y, uint64_t z) { | ||
| return ( x & y ) ^ ( x & z ) ^ ( y & z ); | ||
| } | ||
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| // NIST FIPS 180-4 Section 4.1.3 "SHA-384, SHA-512, SHA-512/224 and SHA-512/256 Functions" | ||
| // Defined as uppercase sigma (Σ) 0 | ||
| constexpr inline uint64_t SIG0_512(uint64_t x) { | ||
| return ROTR( x, 28 ) ^ ROTR( x, 34 ) ^ ROTR( x, 39 ); | ||
| } | ||
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| // NIST FIPS 180-4 Section 4.1.3 "SHA-384, SHA-512, SHA-512/224 and SHA-512/256 Functions" | ||
| // Defined as uppercase sigma (Σ) 1 | ||
| constexpr inline uint64_t SIG1_512(uint64_t x) { | ||
| return ROTR( x, 14 ) ^ ROTR( x, 18 ) ^ ROTR( x, 41 ); | ||
| } | ||
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| // NIST FIPS 180-4 Section 4.1.3 "SHA-384, SHA-512, SHA-512/224 and SHA-512/256 Functions" | ||
| // Defined as lowercase sigma (σ) 0 | ||
| constexpr inline uint64_t sig0_512(uint64_t x) { | ||
| return ROTR( x, 1 ) ^ ROTR( x, 8 ) ^ ( x >> 7 ); | ||
| } | ||
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| // NIST FIPS 180-4 Section 4.1.3 "SHA-384, SHA-512, SHA-512/224 and SHA-512/256 Functions" | ||
| // Defined as lowercase sigma (σ) 1 | ||
| constexpr inline uint64_t sig1_512(uint64_t x) { | ||
| return ROTR( x, 19 ) ^ ROTR( x, 61 ) ^ ( x >> 6 ); | ||
| } | ||
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| constexpr inline void sha512_prepare(sha512_word_t* W, size_t t) { | ||
| // Note: Don't change order of addition (cache miss optimization) | ||
| W[t] = W[t - 7] + W[t - 16] + sig0_512( W[t - 15] ) + sig1_512( W[t - 2] ) ; | ||
| } | ||
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| template <size_t R, size_t N> | ||
| [[nodiscard]] constexpr inline fixed_bytes<R> truncate(const fixed_bytes<N>& hash) | ||
| { | ||
| static_assert( R <= N ); | ||
| fixed_bytes<R> thash; | ||
| memcpy( thash.data(), hash.data(), R ); | ||
| return thash; | ||
| } | ||
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| constexpr inline void sha512_compress(const byte_t* data, sha512_word_hash& H) | ||
| { | ||
| sha512_word_t W[sha512_rounds] = {0}; | ||
| for ( int t = 0; t < 16; t++ ) { | ||
| W[t] = read_u64be(&data[t * sizeof( sha512_word_t )]); | ||
| } | ||
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| // partial loop unroll | ||
| for ( size_t t = 16; t < sha512_rounds; t += 16 ) { | ||
| sha512_prepare( W, t ); sha512_prepare( W, t + 1 ); | ||
| sha512_prepare( W, t + 2 ); sha512_prepare( W, t + 3 ); | ||
| sha512_prepare( W, t + 4 ); sha512_prepare( W, t + 5 ); | ||
| sha512_prepare( W, t + 6 ); sha512_prepare( W, t + 7 ); | ||
| sha512_prepare( W, t + 8 ); sha512_prepare( W, t + 9 ); | ||
| sha512_prepare( W, t + 10 ); sha512_prepare( W, t + 11 ); | ||
| sha512_prepare( W, t + 12 ); sha512_prepare( W, t + 13 ); | ||
| sha512_prepare( W, t + 14 ); sha512_prepare( W, t + 15 ); | ||
| } | ||
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| auto a = H[0]; | ||
| auto b = H[1]; | ||
| auto c = H[2]; | ||
| auto d = H[3]; | ||
| auto e = H[4]; | ||
| auto f = H[5]; | ||
| auto g = H[6]; | ||
| auto h = H[7]; | ||
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| const auto round = [&](size_t t) { | ||
| // Note: Don't change order of addition (cache miss optimization) | ||
| const auto T1 = Ch( e, f, g ) + W[t] + K_512[t] + h + SIG1_512( e ); | ||
| const auto T2 = Maj( a, b, c ) + SIG0_512( a ); | ||
| h = g; | ||
| g = f; | ||
| f = e; | ||
| e = d + T1; | ||
| d = c; | ||
| c = b; | ||
| b = a; | ||
| a = T1 + T2; | ||
| }; | ||
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| // partial loop unroll | ||
| for ( size_t t = 0; t < sha512_rounds; t += 16 ) { | ||
| round( t ); round( t + 1 ); | ||
| round( t + 2 ); round( t + 3 ); | ||
| round( t + 4 ); round( t + 5 ); | ||
| round( t + 6 ); round( t + 7 ); | ||
| round( t + 8 ); round( t + 9 ); | ||
| round( t + 10 ); round( t + 11 ); | ||
| round( t + 12 ); round( t + 13 ); | ||
| round( t + 14 ); round( t + 15 ); | ||
| } | ||
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| H[0] += a; | ||
| H[1] += b; | ||
| H[2] += c; | ||
| H[3] += d; | ||
| H[4] += e; | ||
| H[5] += f; | ||
| H[6] += g; | ||
| H[7] += h; | ||
| }; | ||
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| // NIST FIPS 180-4 Section 6.4.2 "SHA-512 Hash Computation" | ||
| // https://nvlpubs.nist.gov/nistpubs/FIPS/NIST.FIPS.180-4.pdf | ||
| [[nodiscard]] constexpr inline sha512_hash sha512_compute(const sha512_word_hash& s, const byte_t* data, uint64_t size) | ||
| { | ||
| const uint64_t bit_length_low = size << 3; | ||
| const uint64_t bit_length_high = size >> (64 - 3); | ||
| sha512_word_hash H = s; | ||
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| while ( size >= sha512_block_size ) { | ||
| sha512_compress( data, H ); | ||
| data += sha512_block_size; | ||
| size -= sha512_block_size; | ||
| } | ||
|
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| // Add padding | ||
| // NIST FIPS 180-4 Section 5.1.2 "SHA-384, SHA-512, SHA-512/224 and SHA-512/256" | ||
| { | ||
| std::array<byte_t, sha512_block_size> block; | ||
| memcpy( block.data(), data, size ); | ||
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| auto i = size; | ||
| block[i++] = 0x80; | ||
| if ( i > sha512_block_size - sha512_padblock_size ) { | ||
| while (i < sha512_block_size) { | ||
| block[i++] = 0; | ||
| } | ||
| sha512_compress( block.data(), H ); | ||
| i = 0; | ||
| } | ||
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| while ( i < sha512_block_size - sha512_padblock_size ) { | ||
| block[i++] = 0; | ||
| } | ||
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| write_u64le( &block[i], bit_length_high ); | ||
| write_u64le( &block[i + sizeof( sha512_word_t )], bit_length_low ); | ||
| sha512_compress( block.data(), H ); | ||
| } | ||
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| // Convert to little-endian bytes | ||
| sha512_hash hash; | ||
| for ( byte_t i = 0; i < sizeof( sha512_word_t ); i++ ) { | ||
| write_u64le( &hash[i * sizeof( sha512_word_t )], H[i] ); | ||
| } | ||
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| return hash; | ||
| } | ||
| } | ||
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| /** | ||
| * SHA-384 hash function. | ||
| * @note Implementation follows NIST FIPS-180 standard. | ||
| * https://nvlpubs.nist.gov/nistpubs/FIPS/NIST.FIPS.180-4.pdf | ||
| * | ||
| * @param data - data to hash | ||
| * @return 384-bit hash | ||
| */ | ||
| [[nodiscard]] inline hash384 sha384(const bytes_view& data) | ||
| { | ||
| using namespace internal_do_not_use; | ||
| return truncate<sha384_hash_size>( | ||
| sha512_compute(sha384_initial_hash_values, data.data(), data.size()) | ||
| ); | ||
| } | ||
| } |
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