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// Copyright 2009 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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// Generate with: go run gen.go -full | gofmt >md5block.go
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// In its own file so that a faster assembly or C version
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// can be substituted easily.
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// table[i] = int((1<<32) * abs(sin(i+1 radians))).
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const x86 = runtime.GOARCH == "amd64" || runtime.GOARCH == "386"
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x := uint32(0x04030201)
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y := [4]byte{0x1, 0x2, 0x3, 0x4}
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littleEndian = *(*[4]byte)(unsafe.Pointer(&x)) == y
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var shift1 = []uint{7, 12, 17, 22}
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var shift2 = []uint{5, 9, 14, 20}
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var shift3 = []uint{4, 11, 16, 23}
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var shift4 = []uint{6, 10, 15, 21}
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func _Block(dig *digest, p []byte) int {
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func block(dig *digest, p []byte) {
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for len(p) >= _Chunk {
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aa, bb, cc, dd := a, b, c, d
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for i := 0; i < 16; i++ {
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X[i] = uint32(p[j]) | uint32(p[j+1])<<8 | uint32(p[j+2])<<16 | uint32(p[j+3])<<24
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// This is a constant condition - it is not evaluated on each iteration.
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// MD5 was designed so that x86 processors can just iterate
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// over the block data directly as uint32s, and we generate
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// less code and run 1.3x faster if we take advantage of that.
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X = (*[16]uint32)(unsafe.Pointer(&p[0]))
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} else if littleEndian && uintptr(unsafe.Pointer(&p[0]))&(unsafe.Alignof(uint32(0))-1) == 0 {
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X = (*[16]uint32)(unsafe.Pointer(&p[0]))
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for i := 0; i < 16; i++ {
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X[i&15] = uint32(p[j]) | uint32(p[j+1])<<8 | uint32(p[j+2])<<16 | uint32(p[j+3])<<24
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// If this needs to be made faster in the future,
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// the usual trick is to unroll each of these
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// loops by a factor of 4; that lets you replace
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// the shift[] lookups with constants and,
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// with suitable variable renaming in each
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// unrolled body, delete the a, b, c, d = d, a, b, c
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// (or you can let the optimizer do the renaming).
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// The index variables are uint so that % by a power
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// of two can be optimized easily by a compiler.
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for i := uint(0); i < 16; i++ {
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f := ((c ^ d) & b) ^ d
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a += f + X[x] + table[i]
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a = a<<s | a>>(32-s) + b
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a, b, c, d = d, a, b, c
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a += (((c ^ d) & b) ^ d) + X[0] + 3614090360
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a = a<<7 | a>>(32-7) + b
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d += (((b ^ c) & a) ^ c) + X[1] + 3905402710
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d = d<<12 | d>>(32-12) + a
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c += (((a ^ b) & d) ^ b) + X[2] + 606105819
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c = c<<17 | c>>(32-17) + d
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b += (((d ^ a) & c) ^ a) + X[3] + 3250441966
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b = b<<22 | b>>(32-22) + c
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a += (((c ^ d) & b) ^ d) + X[4] + 4118548399
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a = a<<7 | a>>(32-7) + b
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d += (((b ^ c) & a) ^ c) + X[5] + 1200080426
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d = d<<12 | d>>(32-12) + a
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c += (((a ^ b) & d) ^ b) + X[6] + 2821735955
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c = c<<17 | c>>(32-17) + d
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b += (((d ^ a) & c) ^ a) + X[7] + 4249261313
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b = b<<22 | b>>(32-22) + c
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a += (((c ^ d) & b) ^ d) + X[8] + 1770035416
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a = a<<7 | a>>(32-7) + b
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d += (((b ^ c) & a) ^ c) + X[9] + 2336552879
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d = d<<12 | d>>(32-12) + a
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c += (((a ^ b) & d) ^ b) + X[10] + 4294925233
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c = c<<17 | c>>(32-17) + d
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b += (((d ^ a) & c) ^ a) + X[11] + 2304563134
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b = b<<22 | b>>(32-22) + c
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a += (((c ^ d) & b) ^ d) + X[12] + 1804603682
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a = a<<7 | a>>(32-7) + b
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d += (((b ^ c) & a) ^ c) + X[13] + 4254626195
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d = d<<12 | d>>(32-12) + a
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c += (((a ^ b) & d) ^ b) + X[14] + 2792965006
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c = c<<17 | c>>(32-17) + d
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b += (((d ^ a) & c) ^ a) + X[15] + 1236535329
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b = b<<22 | b>>(32-22) + c
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for i := uint(0); i < 16; i++ {
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g := ((b ^ c) & d) ^ c
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a += g + X[x] + table[i+16]
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a = a<<s | a>>(32-s) + b
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a, b, c, d = d, a, b, c
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a += (((b ^ c) & d) ^ c) + X[(1+5*0)&15] + 4129170786
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a = a<<5 | a>>(32-5) + b
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d += (((a ^ b) & c) ^ b) + X[(1+5*1)&15] + 3225465664
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d = d<<9 | d>>(32-9) + a
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c += (((d ^ a) & b) ^ a) + X[(1+5*2)&15] + 643717713
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c = c<<14 | c>>(32-14) + d
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b += (((c ^ d) & a) ^ d) + X[(1+5*3)&15] + 3921069994
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b = b<<20 | b>>(32-20) + c
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a += (((b ^ c) & d) ^ c) + X[(1+5*4)&15] + 3593408605
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a = a<<5 | a>>(32-5) + b
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d += (((a ^ b) & c) ^ b) + X[(1+5*5)&15] + 38016083
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d = d<<9 | d>>(32-9) + a
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c += (((d ^ a) & b) ^ a) + X[(1+5*6)&15] + 3634488961
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c = c<<14 | c>>(32-14) + d
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b += (((c ^ d) & a) ^ d) + X[(1+5*7)&15] + 3889429448
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b = b<<20 | b>>(32-20) + c
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a += (((b ^ c) & d) ^ c) + X[(1+5*8)&15] + 568446438
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a = a<<5 | a>>(32-5) + b
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d += (((a ^ b) & c) ^ b) + X[(1+5*9)&15] + 3275163606
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d = d<<9 | d>>(32-9) + a
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c += (((d ^ a) & b) ^ a) + X[(1+5*10)&15] + 4107603335
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c = c<<14 | c>>(32-14) + d
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b += (((c ^ d) & a) ^ d) + X[(1+5*11)&15] + 1163531501
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b = b<<20 | b>>(32-20) + c
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a += (((b ^ c) & d) ^ c) + X[(1+5*12)&15] + 2850285829
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a = a<<5 | a>>(32-5) + b
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d += (((a ^ b) & c) ^ b) + X[(1+5*13)&15] + 4243563512
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d = d<<9 | d>>(32-9) + a
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c += (((d ^ a) & b) ^ a) + X[(1+5*14)&15] + 1735328473
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c = c<<14 | c>>(32-14) + d
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b += (((c ^ d) & a) ^ d) + X[(1+5*15)&15] + 2368359562
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b = b<<20 | b>>(32-20) + c
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for i := uint(0); i < 16; i++ {
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a += h + X[x] + table[i+32]
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a = a<<s | a>>(32-s) + b
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a, b, c, d = d, a, b, c
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a += (b ^ c ^ d) + X[(5+3*0)&15] + 4294588738
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a = a<<4 | a>>(32-4) + b
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d += (a ^ b ^ c) + X[(5+3*1)&15] + 2272392833
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d = d<<11 | d>>(32-11) + a
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c += (d ^ a ^ b) + X[(5+3*2)&15] + 1839030562
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c = c<<16 | c>>(32-16) + d
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b += (c ^ d ^ a) + X[(5+3*3)&15] + 4259657740
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b = b<<23 | b>>(32-23) + c
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a += (b ^ c ^ d) + X[(5+3*4)&15] + 2763975236
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a = a<<4 | a>>(32-4) + b
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d += (a ^ b ^ c) + X[(5+3*5)&15] + 1272893353
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d = d<<11 | d>>(32-11) + a
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c += (d ^ a ^ b) + X[(5+3*6)&15] + 4139469664
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c = c<<16 | c>>(32-16) + d
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b += (c ^ d ^ a) + X[(5+3*7)&15] + 3200236656
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b = b<<23 | b>>(32-23) + c
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a += (b ^ c ^ d) + X[(5+3*8)&15] + 681279174
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a = a<<4 | a>>(32-4) + b
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d += (a ^ b ^ c) + X[(5+3*9)&15] + 3936430074
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d = d<<11 | d>>(32-11) + a
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c += (d ^ a ^ b) + X[(5+3*10)&15] + 3572445317
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c = c<<16 | c>>(32-16) + d
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b += (c ^ d ^ a) + X[(5+3*11)&15] + 76029189
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b = b<<23 | b>>(32-23) + c
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a += (b ^ c ^ d) + X[(5+3*12)&15] + 3654602809
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a = a<<4 | a>>(32-4) + b
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d += (a ^ b ^ c) + X[(5+3*13)&15] + 3873151461
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d = d<<11 | d>>(32-11) + a
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c += (d ^ a ^ b) + X[(5+3*14)&15] + 530742520
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c = c<<16 | c>>(32-16) + d
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b += (c ^ d ^ a) + X[(5+3*15)&15] + 3299628645
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b = b<<23 | b>>(32-23) + c
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for i := uint(0); i < 16; i++ {
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a += j + X[x] + table[i+48]
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a = a<<s | a>>(32-s) + b
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a, b, c, d = d, a, b, c
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a += (c ^ (b | ^d)) + X[(7*0)&15] + 4096336452
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a = a<<6 | a>>(32-6) + b
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d += (b ^ (a | ^c)) + X[(7*1)&15] + 1126891415
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d = d<<10 | d>>(32-10) + a
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c += (a ^ (d | ^b)) + X[(7*2)&15] + 2878612391
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c = c<<15 | c>>(32-15) + d
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b += (d ^ (c | ^a)) + X[(7*3)&15] + 4237533241
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b = b<<21 | b>>(32-21) + c
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a += (c ^ (b | ^d)) + X[(7*4)&15] + 1700485571
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a = a<<6 | a>>(32-6) + b
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d += (b ^ (a | ^c)) + X[(7*5)&15] + 2399980690
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d = d<<10 | d>>(32-10) + a
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c += (a ^ (d | ^b)) + X[(7*6)&15] + 4293915773
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c = c<<15 | c>>(32-15) + d
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b += (d ^ (c | ^a)) + X[(7*7)&15] + 2240044497
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b = b<<21 | b>>(32-21) + c
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a += (c ^ (b | ^d)) + X[(7*8)&15] + 1873313359
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a = a<<6 | a>>(32-6) + b
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d += (b ^ (a | ^c)) + X[(7*9)&15] + 4264355552
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d = d<<10 | d>>(32-10) + a
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c += (a ^ (d | ^b)) + X[(7*10)&15] + 2734768916
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c = c<<15 | c>>(32-15) + d
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b += (d ^ (c | ^a)) + X[(7*11)&15] + 1309151649
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b = b<<21 | b>>(32-21) + c
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a += (c ^ (b | ^d)) + X[(7*12)&15] + 4149444226
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a = a<<6 | a>>(32-6) + b
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d += (b ^ (a | ^c)) + X[(7*13)&15] + 3174756917
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d = d<<10 | d>>(32-10) + a
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c += (a ^ (d | ^b)) + X[(7*14)&15] + 718787259
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c = c<<15 | c>>(32-15) + d
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b += (d ^ (c | ^a)) + X[(7*15)&15] + 3951481745
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b = b<<21 | b>>(32-21) + c
added
removed
src/pkg/crypto/md5/md5block.go
