| // 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) |
| } |