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aes_ecb_pkcs5padding.go
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aes_ecb_pkcs5padding.go
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/*
* Copyright 1999-2020 Alibaba Group Holding Ltd.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package encryption
import (
"bytes"
"crypto/aes"
"crypto/cipher"
"fmt"
)
func AesEcbPkcs5PaddingEncrypt(plainContent, key []byte) (retBytes []byte, err error) {
if len(plainContent) == 0 {
return nil, nil
}
aesCipherBlock, err := aes.NewCipher(key)
if err != nil {
return nil, err
}
pkcs5PaddingBytes := PKCS5Padding(plainContent, aesCipherBlock.BlockSize())
return BlockEncrypt(pkcs5PaddingBytes, aesCipherBlock)
}
func AesEcbPkcs5PaddingDecrypt(cipherContent, key []byte) (retBytes []byte, err error) {
if len(cipherContent) == 0 {
return nil, nil
}
aesCipherBlock, err := aes.NewCipher(key)
if err != nil {
return nil, err
}
decryptBytes, err := BlockDecrypt(cipherContent, aesCipherBlock)
if err != nil {
return nil, err
}
retBytes = PKCS5UnPadding(decryptBytes)
return retBytes, nil
}
func PKCS5Padding(ciphertext []byte, blockSize int) []byte {
padding := blockSize - len(ciphertext)%blockSize
padtext := bytes.Repeat([]byte{byte(padding)}, padding)
return append(ciphertext, padtext...)
}
func PKCS5UnPadding(origData []byte) []byte {
length := len(origData)
unpadding := int(origData[length-1])
return origData[:(length - unpadding)]
}
func BlockEncrypt(src []byte, b cipher.Block) (dst []byte, err error) {
if len(src)%b.BlockSize() != 0 {
return nil, fmt.Errorf("input not full blocks")
}
buf := make([]byte, b.BlockSize())
for i := 0; i < len(src); i += b.BlockSize() {
b.Encrypt(buf, src[i:i+b.BlockSize()])
dst = append(dst, buf...)
}
return
}
func BlockDecrypt(src []byte, b cipher.Block) (dst []byte, err error) {
if len(src)%b.BlockSize() != 0 {
return nil, fmt.Errorf("input not full blocks")
}
buf := make([]byte, b.BlockSize())
for i := 0; i < len(src); i += b.BlockSize() {
b.Decrypt(buf, src[i:i+b.BlockSize()])
dst = append(dst, buf...)
}
return
}