Source file src/github.com/miekg/dns/hash.go

Documentation: github.com/miekg/dns

     1  package dns
     2  
     3  import (
     4  	"bytes"
     5  	"crypto"
     6  	"hash"
     7  )
     8  
     9  // identityHash will not hash, it only buffers the data written into it and returns it as-is.
    10  type identityHash struct {
    11  	b *bytes.Buffer
    12  }
    13  
    14  // Implement the hash.Hash interface.
    15  
    16  func (i identityHash) Write(b []byte) (int, error) { return i.b.Write(b) }
    17  func (i identityHash) Size() int                   { return i.b.Len() }
    18  func (i identityHash) BlockSize() int              { return 1024 }
    19  func (i identityHash) Reset()                      { i.b.Reset() }
    20  func (i identityHash) Sum(b []byte) []byte         { return append(b, i.b.Bytes()...) }
    21  
    22  func hashFromAlgorithm(alg uint8) (hash.Hash, crypto.Hash, error) {
    23  	hashnumber, ok := AlgorithmToHash[alg]
    24  	if !ok {
    25  		return nil, 0, ErrAlg
    26  	}
    27  	if hashnumber == 0 {
    28  		return identityHash{b: &bytes.Buffer{}}, hashnumber, nil
    29  	}
    30  	return hashnumber.New(), hashnumber, nil
    31  }
    32  

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