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hash.go
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hash.go
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package tmhash
import (
"crypto/sha256"
"hash"
)
const (
Size = 20
BlockSize = sha256.BlockSize
)
type sha256trunc struct {
sha256 hash.Hash
}
func (h sha256trunc) Write(p []byte) (n int, err error) {
return h.sha256.Write(p)
}
func (h sha256trunc) Sum(b []byte) []byte {
shasum := h.sha256.Sum(b)
return shasum[:Size]
}
func (h sha256trunc) Reset() {
h.sha256.Reset()
}
func (h sha256trunc) Size() int {
return Size
}
func (h sha256trunc) BlockSize() int {
return h.sha256.BlockSize()
}
// New returns a new hash.Hash.
func New() hash.Hash {
return sha256trunc{
sha256: sha256.New(),
}
}
// Sum returns the first 20 bytes of SHA256 of the bz.
func Sum(bz []byte) []byte {
hash := sha256.Sum256(bz)
return hash[:Size]
}