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// Copyright 2010 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 ripemd160 implements the RIPEMD-160 hash algorithm.
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// RIPEMD-160 is designed by by Hans Dobbertin, Antoon Bosselaers, and Bart
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// Preneel with specifications available at:
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// http://homes.esat.kuleuven.be/~cosicart/pdf/AB-9601/AB-9601.pdf.
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crypto.RegisterHash(crypto.RIPEMD160, New)
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// The size of the checksum in bytes.
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// The block size of the hash algorithm in bytes.
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// digest represents the partial evaluation of a checksum.
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s [5]uint32 // running context
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x [BlockSize]byte // temporary buffer
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nx int // index into x
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tc uint64 // total count of bytes processed
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func (d *digest) Reset() {
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d.s[0], d.s[1], d.s[2], d.s[3], d.s[4] = _s0, _s1, _s2, _s3, _s4
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// New returns a new hash.Hash computing the checksum.
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func New() hash.Hash {
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func (d *digest) Size() int { return Size }
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func (d *digest) BlockSize() int { return BlockSize }
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func (d *digest) Write(p []byte) (nn int, err error) {
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if n > BlockSize-d.nx {
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for i := 0; i < n; i++ {
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if d.nx == BlockSize {
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d.nx = copy(d.x[:], p)
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func (d0 *digest) Sum(in []byte) []byte {
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// Make a copy of d0 so that caller can keep writing and summing.
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// Padding. Add a 1 bit and 0 bits until 56 bytes mod 64.
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d.Write(tmp[0 : 56-tc%64])
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d.Write(tmp[0 : 64+56-tc%64])
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for i := uint(0); i < 8; i++ {
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tmp[i] = byte(tc >> (8 * i))
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var digest [Size]byte
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for i, s := range d.s {
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digest[i*4] = byte(s)
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digest[i*4+1] = byte(s >> 8)
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digest[i*4+2] = byte(s >> 16)
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digest[i*4+3] = byte(s >> 24)
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return append(in, digest[:]...)