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// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package aes

import (
	"crypto/cipher"
	"crypto/internal/alias"
	"crypto/internal/boring"
	"strconv"
)

// The AES block size in bytes.
const BlockSize = 16

// A cipher is an instance of AES encryption using a particular key.
type aesCipher struct {
	enc []uint32
	dec []uint32
}

type KeySizeError int

func (k KeySizeError) Error() string {
	return "crypto/aes: invalid key size " + strconv.Itoa(int(k))
}

// NewCipher creates and returns a new [cipher.Block].
// The key argument should be the AES key,
// either 16, 24, or 32 bytes to select
// AES-128, AES-192, or AES-256.
func NewCipher(key []byte) (cipher.Block, error) {
	k := len(key)
	switch k {
	default:
		return nil, KeySizeError(k)
	case 16, 24, 32:
		break
	}
	if boring.Enabled {
		return boring.NewAESCipher(key)
	}
	return newCipher(key)
}

// newCipherGeneric creates and returns a new cipher.Block
// implemented in pure Go.
func newCipherGeneric(key []byte) (cipher.Block, error) {
	n := len(key) + 28
	c := aesCipher{make([]uint32, n), make([]uint32, n)}
	expandKeyGo(key, c.enc, c.dec)
	return &c, nil
}

func (c *aesCipher) BlockSize() int { return BlockSize }

func (c *aesCipher) Encrypt(dst, src []byte) {
	if len(src) < BlockSize {
		panic("crypto/aes: input not full block")
	}
	if len(dst) < BlockSize {
		panic("crypto/aes: output not full block")
	}
	if alias.InexactOverlap(dst[:BlockSize], src[:BlockSize]) {
		panic("crypto/aes: invalid buffer overlap")
	}
	encryptBlockGo(c.enc, dst, src)
}

func (c *aesCipher) Decrypt(dst, src []byte) {
	if len(src) < BlockSize {
		panic("crypto/aes: input not full block")
	}
	if len(dst) < BlockSize {
		panic("crypto/aes: output not full block")
	}
	if alias.InexactOverlap(dst[:BlockSize], src[:BlockSize]) {
		panic("crypto/aes: invalid buffer overlap")
	}
	decryptBlockGo(c.dec, dst, src)
}

Batal

⬅ crypto 22 item

Nama	Tipe	Ukuran	Diubah	Aksi
🔵aes_gcm.go	go	5.5 KB	2024-02-02 18:09	✏️ 👁️
🔵aes_test.go	go	11.3 KB	2024-02-02 18:09	✏️ 👁️
📄asm_amd64.s	s	5.4 KB	2024-02-02 18:09	✏️ 👁️
📄asm_arm64.s	s	6.9 KB	2024-02-02 18:09	✏️ 👁️
📄asm_ppc64x.s	s	18.7 KB	2024-02-02 18:09	✏️ 👁️
📄asm_s390x.s	s	4.4 KB	2024-02-02 18:09	✏️ 👁️
🔵block.go	go	6.5 KB	2024-02-02 18:09	✏️ 👁️
🔵cbc_ppc64x.go	go	1.7 KB	2024-02-02 18:09	✏️ 👁️
🔵cbc_s390x.go	go	1.6 KB	2024-02-02 18:09	✏️ 👁️
🔵cipher.go	go	1.9 KB	2024-02-02 18:09	✏️ 👁️
🔵cipher_asm.go	go	2.8 KB	2024-02-02 18:09	✏️ 👁️
🔵cipher_generic.go	go	760 B	2024-02-02 18:09	✏️ 👁️
🔵cipher_s390x.go	go	2.6 KB	2024-02-02 18:09	✏️ 👁️
🔵const.go	go	29.3 KB	2024-02-02 18:09	✏️ 👁️
🔵ctr_s390x.go	go	2.4 KB	2024-02-02 18:09	✏️ 👁️
📄gcm_amd64.s	s	23.4 KB	2024-02-02 18:09	✏️ 👁️
📄gcm_arm64.s	s	21.5 KB	2024-02-02 18:09	✏️ 👁️
🔵gcm_ppc64x.go	go	6.4 KB	2024-02-02 18:09	✏️ 👁️
📄gcm_ppc64x.s	s	27.1 KB	2024-02-02 18:09	✏️ 👁️
🔵gcm_s390x.go	go	11.3 KB	2024-02-02 18:09	✏️ 👁️
🔵modes.go	go	1.1 KB	2024-02-02 18:09	✏️ 👁️
🔵modes_test.go	go	3.5 KB	2024-02-02 18:09	✏️ 👁️

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