diff options
Diffstat (limited to 'vendor/golang.org/x/crypto/salsa20/salsa/salsa208.go')
| -rw-r--r-- | vendor/golang.org/x/crypto/salsa20/salsa/salsa208.go | 199 |
1 files changed, 199 insertions, 0 deletions
diff --git a/vendor/golang.org/x/crypto/salsa20/salsa/salsa208.go b/vendor/golang.org/x/crypto/salsa20/salsa/salsa208.go new file mode 100644 index 0000000..9bfc092 --- /dev/null +++ b/vendor/golang.org/x/crypto/salsa20/salsa/salsa208.go @@ -0,0 +1,199 @@ +// Copyright 2012 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 salsa + +// Core208 applies the Salsa20/8 core function to the 64-byte array in and puts +// the result into the 64-byte array out. The input and output may be the same array. +func Core208(out *[64]byte, in *[64]byte) { + j0 := uint32(in[0]) | uint32(in[1])<<8 | uint32(in[2])<<16 | uint32(in[3])<<24 + j1 := uint32(in[4]) | uint32(in[5])<<8 | uint32(in[6])<<16 | uint32(in[7])<<24 + j2 := uint32(in[8]) | uint32(in[9])<<8 | uint32(in[10])<<16 | uint32(in[11])<<24 + j3 := uint32(in[12]) | uint32(in[13])<<8 | uint32(in[14])<<16 | uint32(in[15])<<24 + j4 := uint32(in[16]) | uint32(in[17])<<8 | uint32(in[18])<<16 | uint32(in[19])<<24 + j5 := uint32(in[20]) | uint32(in[21])<<8 | uint32(in[22])<<16 | uint32(in[23])<<24 + j6 := uint32(in[24]) | uint32(in[25])<<8 | uint32(in[26])<<16 | uint32(in[27])<<24 + j7 := uint32(in[28]) | uint32(in[29])<<8 | uint32(in[30])<<16 | uint32(in[31])<<24 + j8 := uint32(in[32]) | uint32(in[33])<<8 | uint32(in[34])<<16 | uint32(in[35])<<24 + j9 := uint32(in[36]) | uint32(in[37])<<8 | uint32(in[38])<<16 | uint32(in[39])<<24 + j10 := uint32(in[40]) | uint32(in[41])<<8 | uint32(in[42])<<16 | uint32(in[43])<<24 + j11 := uint32(in[44]) | uint32(in[45])<<8 | uint32(in[46])<<16 | uint32(in[47])<<24 + j12 := uint32(in[48]) | uint32(in[49])<<8 | uint32(in[50])<<16 | uint32(in[51])<<24 + j13 := uint32(in[52]) | uint32(in[53])<<8 | uint32(in[54])<<16 | uint32(in[55])<<24 + j14 := uint32(in[56]) | uint32(in[57])<<8 | uint32(in[58])<<16 | uint32(in[59])<<24 + j15 := uint32(in[60]) | uint32(in[61])<<8 | uint32(in[62])<<16 | uint32(in[63])<<24 + + x0, x1, x2, x3, x4, x5, x6, x7, x8 := j0, j1, j2, j3, j4, j5, j6, j7, j8 + x9, x10, x11, x12, x13, x14, x15 := j9, j10, j11, j12, j13, j14, j15 + + for i := 0; i < 8; i += 2 { + u := x0 + x12 + x4 ^= u<<7 | u>>(32-7) + u = x4 + x0 + x8 ^= u<<9 | u>>(32-9) + u = x8 + x4 + x12 ^= u<<13 | u>>(32-13) + u = x12 + x8 + x0 ^= u<<18 | u>>(32-18) + + u = x5 + x1 + x9 ^= u<<7 | u>>(32-7) + u = x9 + x5 + x13 ^= u<<9 | u>>(32-9) + u = x13 + x9 + x1 ^= u<<13 | u>>(32-13) + u = x1 + x13 + x5 ^= u<<18 | u>>(32-18) + + u = x10 + x6 + x14 ^= u<<7 | u>>(32-7) + u = x14 + x10 + x2 ^= u<<9 | u>>(32-9) + u = x2 + x14 + x6 ^= u<<13 | u>>(32-13) + u = x6 + x2 + x10 ^= u<<18 | u>>(32-18) + + u = x15 + x11 + x3 ^= u<<7 | u>>(32-7) + u = x3 + x15 + x7 ^= u<<9 | u>>(32-9) + u = x7 + x3 + x11 ^= u<<13 | u>>(32-13) + u = x11 + x7 + x15 ^= u<<18 | u>>(32-18) + + u = x0 + x3 + x1 ^= u<<7 | u>>(32-7) + u = x1 + x0 + x2 ^= u<<9 | u>>(32-9) + u = x2 + x1 + x3 ^= u<<13 | u>>(32-13) + u = x3 + x2 + x0 ^= u<<18 | u>>(32-18) + + u = x5 + x4 + x6 ^= u<<7 | u>>(32-7) + u = x6 + x5 + x7 ^= u<<9 | u>>(32-9) + u = x7 + x6 + x4 ^= u<<13 | u>>(32-13) + u = x4 + x7 + x5 ^= u<<18 | u>>(32-18) + + u = x10 + x9 + x11 ^= u<<7 | u>>(32-7) + u = x11 + x10 + x8 ^= u<<9 | u>>(32-9) + u = x8 + x11 + x9 ^= u<<13 | u>>(32-13) + u = x9 + x8 + x10 ^= u<<18 | u>>(32-18) + + u = x15 + x14 + x12 ^= u<<7 | u>>(32-7) + u = x12 + x15 + x13 ^= u<<9 | u>>(32-9) + u = x13 + x12 + x14 ^= u<<13 | u>>(32-13) + u = x14 + x13 + x15 ^= u<<18 | u>>(32-18) + } + x0 += j0 + x1 += j1 + x2 += j2 + x3 += j3 + x4 += j4 + x5 += j5 + x6 += j6 + x7 += j7 + x8 += j8 + x9 += j9 + x10 += j10 + x11 += j11 + x12 += j12 + x13 += j13 + x14 += j14 + x15 += j15 + + out[0] = byte(x0) + out[1] = byte(x0 >> 8) + out[2] = byte(x0 >> 16) + out[3] = byte(x0 >> 24) + + out[4] = byte(x1) + out[5] = byte(x1 >> 8) + out[6] = byte(x1 >> 16) + out[7] = byte(x1 >> 24) + + out[8] = byte(x2) + out[9] = byte(x2 >> 8) + out[10] = byte(x2 >> 16) + out[11] = byte(x2 >> 24) + + out[12] = byte(x3) + out[13] = byte(x3 >> 8) + out[14] = byte(x3 >> 16) + out[15] = byte(x3 >> 24) + + out[16] = byte(x4) + out[17] = byte(x4 >> 8) + out[18] = byte(x4 >> 16) + out[19] = byte(x4 >> 24) + + out[20] = byte(x5) + out[21] = byte(x5 >> 8) + out[22] = byte(x5 >> 16) + out[23] = byte(x5 >> 24) + + out[24] = byte(x6) + out[25] = byte(x6 >> 8) + out[26] = byte(x6 >> 16) + out[27] = byte(x6 >> 24) + + out[28] = byte(x7) + out[29] = byte(x7 >> 8) + out[30] = byte(x7 >> 16) + out[31] = byte(x7 >> 24) + + out[32] = byte(x8) + out[33] = byte(x8 >> 8) + out[34] = byte(x8 >> 16) + out[35] = byte(x8 >> 24) + + out[36] = byte(x9) + out[37] = byte(x9 >> 8) + out[38] = byte(x9 >> 16) + out[39] = byte(x9 >> 24) + + out[40] = byte(x10) + out[41] = byte(x10 >> 8) + out[42] = byte(x10 >> 16) + out[43] = byte(x10 >> 24) + + out[44] = byte(x11) + out[45] = byte(x11 >> 8) + out[46] = byte(x11 >> 16) + out[47] = byte(x11 >> 24) + + out[48] = byte(x12) + out[49] = byte(x12 >> 8) + out[50] = byte(x12 >> 16) + out[51] = byte(x12 >> 24) + + out[52] = byte(x13) + out[53] = byte(x13 >> 8) + out[54] = byte(x13 >> 16) + out[55] = byte(x13 >> 24) + + out[56] = byte(x14) + out[57] = byte(x14 >> 8) + out[58] = byte(x14 >> 16) + out[59] = byte(x14 >> 24) + + out[60] = byte(x15) + out[61] = byte(x15 >> 8) + out[62] = byte(x15 >> 16) + out[63] = byte(x15 >> 24) +} |