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