200 lines
4.9 KiB
Go
200 lines
4.9 KiB
Go
// Copyright 2012 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 salsa
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// Core208 applies the Salsa20/8 core function to the 64-byte array in and puts
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// the result into the 64-byte array out. The input and output may be the same array.
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func Core208(out *[64]byte, in *[64]byte) {
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j0 := uint32(in[0]) | uint32(in[1])<<8 | uint32(in[2])<<16 | uint32(in[3])<<24
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j1 := uint32(in[4]) | uint32(in[5])<<8 | uint32(in[6])<<16 | uint32(in[7])<<24
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j2 := uint32(in[8]) | uint32(in[9])<<8 | uint32(in[10])<<16 | uint32(in[11])<<24
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j3 := uint32(in[12]) | uint32(in[13])<<8 | uint32(in[14])<<16 | uint32(in[15])<<24
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j4 := uint32(in[16]) | uint32(in[17])<<8 | uint32(in[18])<<16 | uint32(in[19])<<24
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j5 := uint32(in[20]) | uint32(in[21])<<8 | uint32(in[22])<<16 | uint32(in[23])<<24
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j6 := uint32(in[24]) | uint32(in[25])<<8 | uint32(in[26])<<16 | uint32(in[27])<<24
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j7 := uint32(in[28]) | uint32(in[29])<<8 | uint32(in[30])<<16 | uint32(in[31])<<24
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j8 := uint32(in[32]) | uint32(in[33])<<8 | uint32(in[34])<<16 | uint32(in[35])<<24
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j9 := uint32(in[36]) | uint32(in[37])<<8 | uint32(in[38])<<16 | uint32(in[39])<<24
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j10 := uint32(in[40]) | uint32(in[41])<<8 | uint32(in[42])<<16 | uint32(in[43])<<24
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j11 := uint32(in[44]) | uint32(in[45])<<8 | uint32(in[46])<<16 | uint32(in[47])<<24
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j12 := uint32(in[48]) | uint32(in[49])<<8 | uint32(in[50])<<16 | uint32(in[51])<<24
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j13 := uint32(in[52]) | uint32(in[53])<<8 | uint32(in[54])<<16 | uint32(in[55])<<24
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j14 := uint32(in[56]) | uint32(in[57])<<8 | uint32(in[58])<<16 | uint32(in[59])<<24
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j15 := uint32(in[60]) | uint32(in[61])<<8 | uint32(in[62])<<16 | uint32(in[63])<<24
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x0, x1, x2, x3, x4, x5, x6, x7, x8 := j0, j1, j2, j3, j4, j5, j6, j7, j8
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x9, x10, x11, x12, x13, x14, x15 := j9, j10, j11, j12, j13, j14, j15
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for i := 0; i < 8; i += 2 {
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u := x0 + x12
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x4 ^= u<<7 | u>>(32-7)
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u = x4 + x0
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x8 ^= u<<9 | u>>(32-9)
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u = x8 + x4
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x12 ^= u<<13 | u>>(32-13)
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u = x12 + x8
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x0 ^= u<<18 | u>>(32-18)
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u = x5 + x1
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x9 ^= u<<7 | u>>(32-7)
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u = x9 + x5
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x13 ^= u<<9 | u>>(32-9)
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u = x13 + x9
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x1 ^= u<<13 | u>>(32-13)
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u = x1 + x13
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x5 ^= u<<18 | u>>(32-18)
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u = x10 + x6
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x14 ^= u<<7 | u>>(32-7)
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u = x14 + x10
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x2 ^= u<<9 | u>>(32-9)
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u = x2 + x14
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x6 ^= u<<13 | u>>(32-13)
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u = x6 + x2
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x10 ^= u<<18 | u>>(32-18)
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u = x15 + x11
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x3 ^= u<<7 | u>>(32-7)
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u = x3 + x15
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x7 ^= u<<9 | u>>(32-9)
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u = x7 + x3
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x11 ^= u<<13 | u>>(32-13)
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u = x11 + x7
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x15 ^= u<<18 | u>>(32-18)
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u = x0 + x3
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x1 ^= u<<7 | u>>(32-7)
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u = x1 + x0
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x2 ^= u<<9 | u>>(32-9)
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u = x2 + x1
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x3 ^= u<<13 | u>>(32-13)
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u = x3 + x2
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x0 ^= u<<18 | u>>(32-18)
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u = x5 + x4
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x6 ^= u<<7 | u>>(32-7)
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u = x6 + x5
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x7 ^= u<<9 | u>>(32-9)
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u = x7 + x6
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x4 ^= u<<13 | u>>(32-13)
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u = x4 + x7
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x5 ^= u<<18 | u>>(32-18)
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u = x10 + x9
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x11 ^= u<<7 | u>>(32-7)
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u = x11 + x10
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x8 ^= u<<9 | u>>(32-9)
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u = x8 + x11
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x9 ^= u<<13 | u>>(32-13)
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u = x9 + x8
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x10 ^= u<<18 | u>>(32-18)
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u = x15 + x14
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x12 ^= u<<7 | u>>(32-7)
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u = x12 + x15
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x13 ^= u<<9 | u>>(32-9)
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u = x13 + x12
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x14 ^= u<<13 | u>>(32-13)
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u = x14 + x13
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x15 ^= u<<18 | u>>(32-18)
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}
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x0 += j0
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x1 += j1
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x2 += j2
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x3 += j3
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x4 += j4
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x5 += j5
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x6 += j6
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x7 += j7
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x8 += j8
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x9 += j9
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x10 += j10
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x11 += j11
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x12 += j12
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x13 += j13
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x14 += j14
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x15 += j15
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out[0] = byte(x0)
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out[1] = byte(x0 >> 8)
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out[2] = byte(x0 >> 16)
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out[3] = byte(x0 >> 24)
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out[4] = byte(x1)
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out[5] = byte(x1 >> 8)
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out[6] = byte(x1 >> 16)
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out[7] = byte(x1 >> 24)
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out[8] = byte(x2)
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out[9] = byte(x2 >> 8)
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out[10] = byte(x2 >> 16)
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out[11] = byte(x2 >> 24)
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out[12] = byte(x3)
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out[13] = byte(x3 >> 8)
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out[14] = byte(x3 >> 16)
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out[15] = byte(x3 >> 24)
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out[16] = byte(x4)
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out[17] = byte(x4 >> 8)
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out[18] = byte(x4 >> 16)
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out[19] = byte(x4 >> 24)
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out[20] = byte(x5)
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out[21] = byte(x5 >> 8)
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out[22] = byte(x5 >> 16)
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out[23] = byte(x5 >> 24)
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out[24] = byte(x6)
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out[25] = byte(x6 >> 8)
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out[26] = byte(x6 >> 16)
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out[27] = byte(x6 >> 24)
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out[28] = byte(x7)
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out[29] = byte(x7 >> 8)
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out[30] = byte(x7 >> 16)
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out[31] = byte(x7 >> 24)
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out[32] = byte(x8)
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out[33] = byte(x8 >> 8)
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out[34] = byte(x8 >> 16)
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out[35] = byte(x8 >> 24)
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out[36] = byte(x9)
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out[37] = byte(x9 >> 8)
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out[38] = byte(x9 >> 16)
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out[39] = byte(x9 >> 24)
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out[40] = byte(x10)
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out[41] = byte(x10 >> 8)
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out[42] = byte(x10 >> 16)
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out[43] = byte(x10 >> 24)
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out[44] = byte(x11)
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out[45] = byte(x11 >> 8)
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out[46] = byte(x11 >> 16)
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out[47] = byte(x11 >> 24)
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out[48] = byte(x12)
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out[49] = byte(x12 >> 8)
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out[50] = byte(x12 >> 16)
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out[51] = byte(x12 >> 24)
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out[52] = byte(x13)
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out[53] = byte(x13 >> 8)
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out[54] = byte(x13 >> 16)
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out[55] = byte(x13 >> 24)
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out[56] = byte(x14)
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out[57] = byte(x14 >> 8)
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out[58] = byte(x14 >> 16)
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out[59] = byte(x14 >> 24)
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out[60] = byte(x15)
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out[61] = byte(x15 >> 8)
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out[62] = byte(x15 >> 16)
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out[63] = byte(x15 >> 24)
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}
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