You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
48 lines
751 B
48 lines
751 B
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]
|
|
}
|