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87 lines
2.4 KiB
87 lines
2.4 KiB
// Copyright 2017 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 algorithm
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import (
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"crypto"
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"fmt"
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"hash"
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)
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// Hash is an official hash function algorithm. See RFC 4880, section 9.4.
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type Hash interface {
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// Id returns the algorithm ID, as a byte, of Hash.
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Id() uint8
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// Available reports whether the given hash function is linked into the binary.
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Available() bool
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// HashFunc simply returns the value of h so that Hash implements SignerOpts.
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HashFunc() crypto.Hash
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// New returns a new hash.Hash calculating the given hash function. New
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// panics if the hash function is not linked into the binary.
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New() hash.Hash
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// Size returns the length, in bytes, of a digest resulting from the given
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// hash function. It doesn't require that the hash function in question be
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// linked into the program.
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Size() int
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// String is the name of the hash function corresponding to the given
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// OpenPGP hash id.
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String() string
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}
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// The following vars mirror the crypto/Hash supported hash functions.
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var (
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MD5 Hash = cryptoHash{1, crypto.MD5}
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SHA1 Hash = cryptoHash{2, crypto.SHA1}
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RIPEMD160 Hash = cryptoHash{3, crypto.RIPEMD160}
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SHA256 Hash = cryptoHash{8, crypto.SHA256}
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SHA384 Hash = cryptoHash{9, crypto.SHA384}
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SHA512 Hash = cryptoHash{10, crypto.SHA512}
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SHA224 Hash = cryptoHash{11, crypto.SHA224}
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)
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// HashById represents the different hash functions specified for OpenPGP. See
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// http://www.iana.org/assignments/pgp-parameters/pgp-parameters.xhtml#pgp-parameters-14
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var (
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HashById = map[uint8]Hash{
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MD5.Id(): MD5,
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SHA1.Id(): SHA1,
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RIPEMD160.Id(): RIPEMD160,
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SHA256.Id(): SHA256,
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SHA384.Id(): SHA384,
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SHA512.Id(): SHA512,
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SHA224.Id(): SHA224,
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}
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)
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// cryptoHash contains pairs relating OpenPGP's hash identifier with
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// Go's crypto.Hash type. See RFC 4880, section 9.4.
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type cryptoHash struct {
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id uint8
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crypto.Hash
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}
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// Id returns the algorithm ID, as a byte, of cryptoHash.
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func (h cryptoHash) Id() uint8 {
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return h.id
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}
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var hashNames = map[uint8]string{
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MD5.Id(): "MD5",
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SHA1.Id(): "SHA1",
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RIPEMD160.Id(): "RIPEMD160",
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SHA256.Id(): "SHA256",
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SHA384.Id(): "SHA384",
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SHA512.Id(): "SHA512",
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SHA224.Id(): "SHA224",
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}
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func (h cryptoHash) String() string {
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s, ok := hashNames[h.id]
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if !ok {
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panic(fmt.Sprintf("Unsupported hash function %d", h.id))
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}
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return s
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}
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