Source file src/crypto/internal/fips140/hash.go
1 // Copyright 2024 The Go Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style 3 // license that can be found in the LICENSE file. 4 5 package fips140 6 7 import "io" 8 9 // Hash is the common interface implemented by all hash functions. It is a copy 10 // of [hash.Hash] from the standard library, to avoid depending on security 11 // definitions from outside of the module. 12 type Hash interface { 13 // Write (via the embedded io.Writer interface) adds more data to the 14 // running hash. It never returns an error. 15 io.Writer 16 17 // Sum appends the current hash to b and returns the resulting slice. 18 // It does not change the underlying hash state. 19 Sum(b []byte) []byte 20 21 // Reset resets the Hash to its initial state. 22 Reset() 23 24 // Size returns the number of bytes Sum will return. 25 Size() int 26 27 // BlockSize returns the hash's underlying block size. 28 // The Write method must be able to accept any amount 29 // of data, but it may operate more efficiently if all writes 30 // are a multiple of the block size. 31 BlockSize() int 32 } 33