181 lines
3.9 KiB
Go
181 lines
3.9 KiB
Go
// Copyright 2016 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package blake2b
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import (
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"encoding/binary"
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"math/bits"
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)
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// the precomputed values for BLAKE2b
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// there are 10 16-byte arrays - one for each round
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// the entries are calculated from the sigma constants.
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var precomputed = [10][16]byte{
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{0, 2, 4, 6, 1, 3, 5, 7, 8, 10, 12, 14, 9, 11, 13, 15},
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{14, 4, 9, 13, 10, 8, 15, 6, 1, 0, 11, 5, 12, 2, 7, 3},
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{11, 12, 5, 15, 8, 0, 2, 13, 10, 3, 7, 9, 14, 6, 1, 4},
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{7, 3, 13, 11, 9, 1, 12, 14, 2, 5, 4, 15, 6, 10, 0, 8},
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{9, 5, 2, 10, 0, 7, 4, 15, 14, 11, 6, 3, 1, 12, 8, 13},
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{2, 6, 0, 8, 12, 10, 11, 3, 4, 7, 15, 1, 13, 5, 14, 9},
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{12, 1, 14, 4, 5, 15, 13, 10, 0, 6, 9, 8, 7, 3, 2, 11},
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{13, 7, 12, 3, 11, 14, 1, 9, 5, 15, 8, 2, 0, 4, 6, 10},
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{6, 14, 11, 0, 15, 9, 3, 8, 12, 13, 1, 10, 2, 7, 4, 5},
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{10, 8, 7, 1, 2, 4, 6, 5, 15, 9, 3, 13, 11, 14, 12, 0},
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}
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func hashBlocksGeneric(h *[8]uint64, c *[2]uint64, flag uint64, blocks []byte) {
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var m [16]uint64
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c0, c1 := c[0], c[1]
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for i := 0; i < len(blocks); {
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c0 += BlockSize
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if c0 < BlockSize {
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c1++
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}
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for j := range m {
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m[j] = binary.LittleEndian.Uint64(blocks[i:])
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i += 8
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}
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fGeneric(h, &m, c0, c1, flag, 12)
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}
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c[0], c[1] = c0, c1
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}
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func fGeneric(h *[8]uint64, m *[16]uint64, c0, c1 uint64, flag uint64, rounds uint64) {
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v0, v1, v2, v3, v4, v5, v6, v7 := h[0], h[1], h[2], h[3], h[4], h[5], h[6], h[7]
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v8, v9, v10, v11, v12, v13, v14, v15 := iv[0], iv[1], iv[2], iv[3], iv[4], iv[5], iv[6], iv[7]
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v12 ^= c0
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v13 ^= c1
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v14 ^= flag
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for i := 0; i < int(rounds); i++ {
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s := &(precomputed[i%10])
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v0 += m[s[0]]
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v0 += v4
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v12 ^= v0
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v12 = bits.RotateLeft64(v12, -32)
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v8 += v12
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v4 ^= v8
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v4 = bits.RotateLeft64(v4, -24)
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v1 += m[s[1]]
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v1 += v5
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v13 ^= v1
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v13 = bits.RotateLeft64(v13, -32)
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v9 += v13
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v5 ^= v9
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v5 = bits.RotateLeft64(v5, -24)
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v2 += m[s[2]]
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v2 += v6
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v14 ^= v2
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v14 = bits.RotateLeft64(v14, -32)
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v10 += v14
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v6 ^= v10
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v6 = bits.RotateLeft64(v6, -24)
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v3 += m[s[3]]
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v3 += v7
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v15 ^= v3
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v15 = bits.RotateLeft64(v15, -32)
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v11 += v15
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v7 ^= v11
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v7 = bits.RotateLeft64(v7, -24)
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v0 += m[s[4]]
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v0 += v4
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v12 ^= v0
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v12 = bits.RotateLeft64(v12, -16)
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v8 += v12
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v4 ^= v8
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v4 = bits.RotateLeft64(v4, -63)
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v1 += m[s[5]]
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v1 += v5
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v13 ^= v1
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v13 = bits.RotateLeft64(v13, -16)
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v9 += v13
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v5 ^= v9
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v5 = bits.RotateLeft64(v5, -63)
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v2 += m[s[6]]
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v2 += v6
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v14 ^= v2
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v14 = bits.RotateLeft64(v14, -16)
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v10 += v14
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v6 ^= v10
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v6 = bits.RotateLeft64(v6, -63)
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v3 += m[s[7]]
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v3 += v7
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v15 ^= v3
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v15 = bits.RotateLeft64(v15, -16)
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v11 += v15
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v7 ^= v11
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v7 = bits.RotateLeft64(v7, -63)
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v0 += m[s[8]]
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v0 += v5
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v15 ^= v0
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v15 = bits.RotateLeft64(v15, -32)
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v10 += v15
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v5 ^= v10
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v5 = bits.RotateLeft64(v5, -24)
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v1 += m[s[9]]
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v1 += v6
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v12 ^= v1
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v12 = bits.RotateLeft64(v12, -32)
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v11 += v12
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v6 ^= v11
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v6 = bits.RotateLeft64(v6, -24)
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v2 += m[s[10]]
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v2 += v7
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v13 ^= v2
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v13 = bits.RotateLeft64(v13, -32)
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v8 += v13
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v7 ^= v8
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v7 = bits.RotateLeft64(v7, -24)
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v3 += m[s[11]]
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v3 += v4
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v14 ^= v3
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v14 = bits.RotateLeft64(v14, -32)
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v9 += v14
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v4 ^= v9
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v4 = bits.RotateLeft64(v4, -24)
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v0 += m[s[12]]
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v0 += v5
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v15 ^= v0
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v15 = bits.RotateLeft64(v15, -16)
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v10 += v15
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v5 ^= v10
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v5 = bits.RotateLeft64(v5, -63)
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v1 += m[s[13]]
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v1 += v6
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v12 ^= v1
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v12 = bits.RotateLeft64(v12, -16)
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v11 += v12
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v6 ^= v11
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v6 = bits.RotateLeft64(v6, -63)
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v2 += m[s[14]]
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v2 += v7
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v13 ^= v2
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v13 = bits.RotateLeft64(v13, -16)
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v8 += v13
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v7 ^= v8
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v7 = bits.RotateLeft64(v7, -63)
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v3 += m[s[15]]
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v3 += v4
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v14 ^= v3
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v14 = bits.RotateLeft64(v14, -16)
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v9 += v14
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v4 ^= v9
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v4 = bits.RotateLeft64(v4, -63)
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}
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h[0] ^= v0 ^ v8
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h[1] ^= v1 ^ v9
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h[2] ^= v2 ^ v10
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h[3] ^= v3 ^ v11
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h[4] ^= v4 ^ v12
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h[5] ^= v5 ^ v13
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h[6] ^= v6 ^ v14
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h[7] ^= v7 ^ v15
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}
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