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hash.go
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hash.go
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package common
import (
"fmt"
"math/big"
)
const (
// HashLength is the expected length of the hash
HashLength = 32
)
// Hash represents the 32 byte Keccak256 hash of arbitrary data.
type Hash [HashLength]byte
// BytesToHash sets b to hash.
// If b is larger than len(h), b will be cropped from the left.
func BytesToHash(b []byte) Hash {
var h Hash
h.SetBytes(b)
return h
}
// BigToHash sets byte representation of b to hash.
// If b is larger than len(h), b will be cropped from the left.
func BigToHash(b *big.Int) Hash { return BytesToHash(b.Bytes()) }
// HexToHash sets byte representation of s to hash.
// If b is larger than len(h), b will be cropped from the left.
func HexToHash(s string) (Hash, error) {
b, err := HexStringToBytes(s)
if err != nil {
return Hash{}, err
}
return BytesToHash(b), nil
}
// Bytes gets the byte representation of the underlying hash.
func (h Hash) Bytes() []byte { return h[:] }
// Big converts a hash to a big integer.
func (h Hash) Big() *big.Int { return new(big.Int).SetBytes(h[:]) }
// Hex converts a hash to a hex string.
func (h Hash) Hex() string { return BytesToHexString(h[:]) }
// TerminalString implements log.TerminalStringer, formatting a string for console
// output during logging.
func (h Hash) TerminalString() string {
return fmt.Sprintf("%x…%x", h[:3], h[29:])
}
// String implements the stringer interface and is used also by the logger when
// doing full logging into a file.
func (h Hash) String() string {
return h.Hex()
}
// SetBytes sets the hash to the value of b.
// If b is larger than len(h), b will be cropped from the left.
func (h *Hash) SetBytes(b []byte) {
if len(b) > len(h) {
b = b[len(b)-HashLength:]
}
copy(h[HashLength-len(b):], b)
}