66 lines
1.2 KiB
Go
66 lines
1.2 KiB
Go
// Copyright 2011 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 openpgp
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import (
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"hash"
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"io"
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)
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// NewCanonicalTextHash reformats text written to it into the canonical
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// form and then applies the hash h. See RFC 4880, section 5.2.1.
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func NewCanonicalTextHash(h hash.Hash) hash.Hash {
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return &canonicalTextHash{h, 0}
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}
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type canonicalTextHash struct {
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h hash.Hash
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s int
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}
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var newline = []byte{'\r', '\n'}
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func writeCanonical(cw io.Writer, buf []byte, s *int) (int, error) {
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start := 0
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for i, c := range buf {
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switch *s {
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case 0:
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if c == '\r' {
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*s = 1
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} else if c == '\n' {
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cw.Write(buf[start:i])
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cw.Write(newline)
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start = i + 1
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}
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case 1:
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*s = 0
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}
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}
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cw.Write(buf[start:])
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return len(buf), nil
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}
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func (cth *canonicalTextHash) Write(buf []byte) (int, error) {
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return writeCanonical(cth.h, buf, &cth.s)
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}
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func (cth *canonicalTextHash) Sum(in []byte) []byte {
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return cth.h.Sum(in)
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}
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func (cth *canonicalTextHash) Reset() {
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cth.h.Reset()
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cth.s = 0
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}
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func (cth *canonicalTextHash) Size() int {
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return cth.h.Size()
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}
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func (cth *canonicalTextHash) BlockSize() int {
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return cth.h.BlockSize()
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}
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