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31 lines
875 B
Go
31 lines
875 B
Go
package dns
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import (
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"bytes"
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"crypto"
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"hash"
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)
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// identityHash will not hash, it only buffers the data written into it and returns it as-is.
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type identityHash struct {
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b *bytes.Buffer
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}
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// Implement the hash.Hash interface.
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func (i identityHash) Write(b []byte) (int, error) { return i.b.Write(b) }
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func (i identityHash) Size() int { return i.b.Len() }
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func (i identityHash) BlockSize() int { return 1024 }
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func (i identityHash) Reset() { i.b.Reset() }
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func (i identityHash) Sum(b []byte) []byte { return append(b, i.b.Bytes()...) }
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func hashFromAlgorithm(alg uint8) (hash.Hash, crypto.Hash, error) {
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hashnumber, ok := AlgorithmToHash[alg]
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if !ok {
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return nil, 0, ErrAlg
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}
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if hashnumber == 0 {
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return identityHash{b: &bytes.Buffer{}}, hashnumber, nil
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}
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return hashnumber.New(), hashnumber, nil
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}
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