73 lines
1.9 KiB
Go
73 lines
1.9 KiB
Go
// Copyright (c) 2019 Alexander Medvednikov. All rights reserved.
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// Use of this source code is governed by an MIT license
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// that can be found in the LICENSE file.
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// Based off: https://github.com/golang/go/blob/master/src/crypto/aes
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// Last commit: https://github.com/golang/go/commit/691a2d457ab1bf03bd46d4b69e0f93b8993c0055
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module aes
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import (
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crypto.cipher
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crypto.internal.subtle
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)
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const (
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// The AES block size in bytes.
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BlockSize = 16
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)
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// A cipher is an instance of AES encryption using a particular key.
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struct AesCipher {
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enc []u32
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dec []u32
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}
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// new_cipher creates and returns a new cipher.Block.
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// The key argument should be the AES key,
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// either 16, 24, or 32 bytes to select
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// AES-128, AES-192, or AES-256.
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pub fn new_cipher(key []byte) AesCipher {
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k := key.len
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switch k {
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case 16, 24, 32:
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// break
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default:
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panic('crypto.aes: invalid key size ' + k.str())
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// return error('crypto.aes: invalid key size ' + k.str())
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}
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// for now use generic version
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return new_cipher_generic(key)
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}
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pub fn (c &AesCipher) block_size() int { return BlockSize }
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pub fn (c &AesCipher) encrypt(dst, src []byte) {
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if src.len < BlockSize {
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panic('crypto.aes: input not full block')
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}
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if dst.len < BlockSize {
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panic('crypto.aes: output not full block')
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}
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// if subtle.inexact_overlap(dst[:BlockSize], src[:BlockSize]) {
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if subtle.inexact_overlap(dst.left(BlockSize), src.left(BlockSize)) {
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panic('crypto.aes: invalid buffer overlap')
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}
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// for now use generic version
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encrypt_block_generic(c.enc, dst, src)
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}
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pub fn (c &AesCipher) decrypt(dst, src []byte) {
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if src.len < BlockSize {
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panic('crypto.aes: input not full block')
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}
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if dst.len < BlockSize {
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panic('crypto.aes: output not full block')
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}
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if subtle.inexact_overlap(dst.left(BlockSize), src.left(BlockSize)) {
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panic('crypto.aes: invalid buffer overlap')
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}
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// for now use generic version
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decrypt_block_generic(c.dec, dst, src)
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}
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