--- /dev/null
+// Copyright 2010 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.
+
+// RIPEMD-160 block step.
+// In its own file so that a faster assembly or C version
+// can be substituted easily.
+
+package ripemd160
+
+// work buffer indices and roll amounts for one line
+var _n = [80]uint{
+ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
+ 7, 4, 13, 1, 10, 6, 15, 3, 12, 0, 9, 5, 2, 14, 11, 8,
+ 3, 10, 14, 4, 9, 15, 8, 1, 2, 7, 0, 6, 13, 11, 5, 12,
+ 1, 9, 11, 10, 0, 8, 12, 4, 13, 3, 7, 15, 14, 5, 6, 2,
+ 4, 0, 5, 9, 7, 12, 2, 10, 14, 1, 3, 8, 11, 6, 15, 13,
+}
+
+var _r = [80]uint{
+ 11, 14, 15, 12, 5, 8, 7, 9, 11, 13, 14, 15, 6, 7, 9, 8,
+ 7, 6, 8, 13, 11, 9, 7, 15, 7, 12, 15, 9, 11, 7, 13, 12,
+ 11, 13, 6, 7, 14, 9, 13, 15, 14, 8, 13, 6, 5, 12, 7, 5,
+ 11, 12, 14, 15, 14, 15, 9, 8, 9, 14, 5, 6, 8, 6, 5, 12,
+ 9, 15, 5, 11, 6, 8, 13, 12, 5, 12, 13, 14, 11, 8, 5, 6,
+}
+
+// same for the other parallel one
+var n_ = [80]uint{
+ 5, 14, 7, 0, 9, 2, 11, 4, 13, 6, 15, 8, 1, 10, 3, 12,
+ 6, 11, 3, 7, 0, 13, 5, 10, 14, 15, 8, 12, 4, 9, 1, 2,
+ 15, 5, 1, 3, 7, 14, 6, 9, 11, 8, 12, 2, 10, 0, 4, 13,
+ 8, 6, 4, 1, 3, 11, 15, 0, 5, 12, 2, 13, 9, 7, 10, 14,
+ 12, 15, 10, 4, 1, 5, 8, 7, 6, 2, 13, 14, 0, 3, 9, 11,
+}
+
+var r_ = [80]uint{
+ 8, 9, 9, 11, 13, 15, 15, 5, 7, 7, 8, 11, 14, 14, 12, 6,
+ 9, 13, 15, 7, 12, 8, 9, 11, 7, 7, 12, 7, 6, 15, 13, 11,
+ 9, 7, 15, 11, 8, 6, 6, 14, 12, 13, 5, 14, 13, 13, 7, 5,
+ 15, 5, 8, 11, 14, 14, 6, 14, 6, 9, 12, 9, 12, 5, 15, 8,
+ 8, 5, 12, 9, 12, 5, 14, 6, 8, 13, 6, 5, 15, 13, 11, 11,
+}
+
+func _Block(md *digest, p []byte) int {
+ n := 0
+ var x [16]uint32
+ var alpha, beta uint32
+ for len(p) >= BlockSize {
+ a, b, c, d, e := md.s[0], md.s[1], md.s[2], md.s[3], md.s[4]
+ aa, bb, cc, dd, ee := a, b, c, d, e
+ j := 0
+ for i := 0; i < 16; i++ {
+ x[i] = uint32(p[j]) | uint32(p[j+1])<<8 | uint32(p[j+2])<<16 | uint32(p[j+3])<<24
+ j += 4
+ }
+
+ // round 1
+ i := 0
+ for i < 16 {
+ alpha = a + (b ^ c ^ d) + x[_n[i]]
+ s := _r[i]
+ alpha = (alpha<<s | alpha>>(32-s)) + e
+ beta = c<<10 | c>>22
+ a, b, c, d, e = e, alpha, b, beta, d
+
+ // parallel line
+ alpha = aa + (bb ^ (cc | ^dd)) + x[n_[i]] + 0x50a28be6
+ s = r_[i]
+ alpha = (alpha<<s | alpha>>(32-s)) + ee
+ beta = cc<<10 | cc>>22
+ aa, bb, cc, dd, ee = ee, alpha, bb, beta, dd
+
+ i++
+ }
+
+ // round 2
+ for i < 32 {
+ alpha = a + (b&c | ^b&d) + x[_n[i]] + 0x5a827999
+ s := _r[i]
+ alpha = (alpha<<s | alpha>>(32-s)) + e
+ beta = c<<10 | c>>22
+ a, b, c, d, e = e, alpha, b, beta, d
+
+ // parallel line
+ alpha = aa + (bb&dd | cc&^dd) + x[n_[i]] + 0x5c4dd124
+ s = r_[i]
+ alpha = (alpha<<s | alpha>>(32-s)) + ee
+ beta = cc<<10 | cc>>22
+ aa, bb, cc, dd, ee = ee, alpha, bb, beta, dd
+
+ i++
+ }
+
+ // round 3
+ for i < 48 {
+ alpha = a + (b | ^c ^ d) + x[_n[i]] + 0x6ed9eba1
+ s := _r[i]
+ alpha = (alpha<<s | alpha>>(32-s)) + e
+ beta = c<<10 | c>>22
+ a, b, c, d, e = e, alpha, b, beta, d
+
+ // parallel line
+ alpha = aa + (bb | ^cc ^ dd) + x[n_[i]] + 0x6d703ef3
+ s = r_[i]
+ alpha = (alpha<<s | alpha>>(32-s)) + ee
+ beta = cc<<10 | cc>>22
+ aa, bb, cc, dd, ee = ee, alpha, bb, beta, dd
+
+ i++
+ }
+
+ // round 4
+ for i < 64 {
+ alpha = a + (b&d | c&^d) + x[_n[i]] + 0x8f1bbcdc
+ s := _r[i]
+ alpha = (alpha<<s | alpha>>(32-s)) + e
+ beta = c<<10 | c>>22
+ a, b, c, d, e = e, alpha, b, beta, d
+
+ // parallel line
+ alpha = aa + (bb&cc | ^bb&dd) + x[n_[i]] + 0x7a6d76e9
+ s = r_[i]
+ alpha = (alpha<<s | alpha>>(32-s)) + ee
+ beta = cc<<10 | cc>>22
+ aa, bb, cc, dd, ee = ee, alpha, bb, beta, dd
+
+ i++
+ }
+
+ // round 5
+ for i < 80 {
+ alpha = a + (b ^ (c | ^d)) + x[_n[i]] + 0xa953fd4e
+ s := _r[i]
+ alpha = (alpha<<s | alpha>>(32-s)) + e
+ beta = c<<10 | c>>22
+ a, b, c, d, e = e, alpha, b, beta, d
+
+ // parallel line
+ alpha = aa + (bb ^ cc ^ dd) + x[n_[i]]
+ s = r_[i]
+ alpha = (alpha<<s | alpha>>(32-s)) + ee
+ beta = cc<<10 | cc>>22
+ aa, bb, cc, dd, ee = ee, alpha, bb, beta, dd
+
+ i++
+ }
+
+ // combine results
+ dd += c + md.s[1]
+ md.s[1] = md.s[2] + d + ee
+ md.s[2] = md.s[3] + e + aa
+ md.s[3] = md.s[4] + a + bb
+ md.s[4] = md.s[0] + b + cc
+ md.s[0] = dd
+
+ p = p[BlockSize:]
+ n += BlockSize
+ }
+ return n
+}
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