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blake2s_generic.go
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/
blake2s_generic.go
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// Copyright 2016 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package blake2s
import (
"math/bits"
)
// the precomputed values for BLAKE2s
// there are 10 16-byte arrays - one for each round
// the entries are calculated from the sigma constants.
var precomputed = [10][16]byte{
{0, 2, 4, 6, 1, 3, 5, 7, 8, 10, 12, 14, 9, 11, 13, 15},
{14, 4, 9, 13, 10, 8, 15, 6, 1, 0, 11, 5, 12, 2, 7, 3},
{11, 12, 5, 15, 8, 0, 2, 13, 10, 3, 7, 9, 14, 6, 1, 4},
{7, 3, 13, 11, 9, 1, 12, 14, 2, 5, 4, 15, 6, 10, 0, 8},
{9, 5, 2, 10, 0, 7, 4, 15, 14, 11, 6, 3, 1, 12, 8, 13},
{2, 6, 0, 8, 12, 10, 11, 3, 4, 7, 15, 1, 13, 5, 14, 9},
{12, 1, 14, 4, 5, 15, 13, 10, 0, 6, 9, 8, 7, 3, 2, 11},
{13, 7, 12, 3, 11, 14, 1, 9, 5, 15, 8, 2, 0, 4, 6, 10},
{6, 14, 11, 0, 15, 9, 3, 8, 12, 13, 1, 10, 2, 7, 4, 5},
{10, 8, 7, 1, 2, 4, 6, 5, 15, 9, 3, 13, 11, 14, 12, 0},
}
func hashBlocksGeneric(h *[8]uint32, c *[2]uint32, flag uint32, blocks []byte) {
var m [16]uint32
c0, c1 := c[0], c[1]
for i := 0; i < len(blocks); {
c0 += BlockSize
if c0 < BlockSize {
c1++
}
v0, v1, v2, v3, v4, v5, v6, v7 := h[0], h[1], h[2], h[3], h[4], h[5], h[6], h[7]
v8, v9, v10, v11, v12, v13, v14, v15 := iv[0], iv[1], iv[2], iv[3], iv[4], iv[5], iv[6], iv[7]
v12 ^= c0
v13 ^= c1
v14 ^= flag
for j := range m {
m[j] = uint32(blocks[i]) | uint32(blocks[i+1])<<8 | uint32(blocks[i+2])<<16 | uint32(blocks[i+3])<<24
i += 4
}
for k := range precomputed {
s := &(precomputed[k])
v0 += m[s[0]]
v0 += v4
v12 ^= v0
v12 = bits.RotateLeft32(v12, -16)
v8 += v12
v4 ^= v8
v4 = bits.RotateLeft32(v4, -12)
v1 += m[s[1]]
v1 += v5
v13 ^= v1
v13 = bits.RotateLeft32(v13, -16)
v9 += v13
v5 ^= v9
v5 = bits.RotateLeft32(v5, -12)
v2 += m[s[2]]
v2 += v6
v14 ^= v2
v14 = bits.RotateLeft32(v14, -16)
v10 += v14
v6 ^= v10
v6 = bits.RotateLeft32(v6, -12)
v3 += m[s[3]]
v3 += v7
v15 ^= v3
v15 = bits.RotateLeft32(v15, -16)
v11 += v15
v7 ^= v11
v7 = bits.RotateLeft32(v7, -12)
v0 += m[s[4]]
v0 += v4
v12 ^= v0
v12 = bits.RotateLeft32(v12, -8)
v8 += v12
v4 ^= v8
v4 = bits.RotateLeft32(v4, -7)
v1 += m[s[5]]
v1 += v5
v13 ^= v1
v13 = bits.RotateLeft32(v13, -8)
v9 += v13
v5 ^= v9
v5 = bits.RotateLeft32(v5, -7)
v2 += m[s[6]]
v2 += v6
v14 ^= v2
v14 = bits.RotateLeft32(v14, -8)
v10 += v14
v6 ^= v10
v6 = bits.RotateLeft32(v6, -7)
v3 += m[s[7]]
v3 += v7
v15 ^= v3
v15 = bits.RotateLeft32(v15, -8)
v11 += v15
v7 ^= v11
v7 = bits.RotateLeft32(v7, -7)
v0 += m[s[8]]
v0 += v5
v15 ^= v0
v15 = bits.RotateLeft32(v15, -16)
v10 += v15
v5 ^= v10
v5 = bits.RotateLeft32(v5, -12)
v1 += m[s[9]]
v1 += v6
v12 ^= v1
v12 = bits.RotateLeft32(v12, -16)
v11 += v12
v6 ^= v11
v6 = bits.RotateLeft32(v6, -12)
v2 += m[s[10]]
v2 += v7
v13 ^= v2
v13 = bits.RotateLeft32(v13, -16)
v8 += v13
v7 ^= v8
v7 = bits.RotateLeft32(v7, -12)
v3 += m[s[11]]
v3 += v4
v14 ^= v3
v14 = bits.RotateLeft32(v14, -16)
v9 += v14
v4 ^= v9
v4 = bits.RotateLeft32(v4, -12)
v0 += m[s[12]]
v0 += v5
v15 ^= v0
v15 = bits.RotateLeft32(v15, -8)
v10 += v15
v5 ^= v10
v5 = bits.RotateLeft32(v5, -7)
v1 += m[s[13]]
v1 += v6
v12 ^= v1
v12 = bits.RotateLeft32(v12, -8)
v11 += v12
v6 ^= v11
v6 = bits.RotateLeft32(v6, -7)
v2 += m[s[14]]
v2 += v7
v13 ^= v2
v13 = bits.RotateLeft32(v13, -8)
v8 += v13
v7 ^= v8
v7 = bits.RotateLeft32(v7, -7)
v3 += m[s[15]]
v3 += v4
v14 ^= v3
v14 = bits.RotateLeft32(v14, -8)
v9 += v14
v4 ^= v9
v4 = bits.RotateLeft32(v4, -7)
}
h[0] ^= v0 ^ v8
h[1] ^= v1 ^ v9
h[2] ^= v2 ^ v10
h[3] ^= v3 ^ v11
h[4] ^= v4 ^ v12
h[5] ^= v5 ^ v13
h[6] ^= v6 ^ v14
h[7] ^= v7 ^ v15
}
c[0], c[1] = c0, c1
}