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ae64.go
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ae64.go
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package util
import (
"bytes"
"crypto/aes"
"crypto/cipher"
"encoding/base64"
)
func padding(src []byte, blockSize int) []byte {
padNum := blockSize - len(src)%blockSize
pad := bytes.Repeat([]byte{byte(padNum)}, padNum)
return append(src, pad...)
}
func unpadding(src []byte) []byte {
n := len(src)
unPadNum := int(src[n-1])
return src[:n-unPadNum]
}
func encryptAES(src []byte, key []byte) ([]byte, error) {
block, err := aes.NewCipher(key)
if err != nil {
return nil, err
}
src = padding(src, block.BlockSize())
blockMode := cipher.NewCBCEncrypter(block, key)
blockMode.CryptBlocks(src, src)
return src, nil
}
func decryptAES(src []byte, key []byte) ([]byte, error) {
block, err := aes.NewCipher(key)
if err != nil {
return nil, err
}
blockMode := cipher.NewCBCDecrypter(block, key)
blockMode.CryptBlocks(src, src)
src = unpadding(src)
return src, nil
}
func Ae64Encode(src []byte, key []byte) (string, error) {
if len(key) <= 16 {
paddingCount := 16 - len(key)
for i := 0; i < paddingCount; i++ {
key = append(key, byte(' '))
}
} else {
key = key[0:16]
}
encryptBytes, err := encryptAES(src, key)
if err != nil {
return "", err
}
return base64.StdEncoding.EncodeToString(encryptBytes), nil
}
func Ae64Decode(str string, key []byte) ([]byte, error) {
if len(key) <= 16 {
paddingCount := 16 - len(key)
for i := 0; i < paddingCount; i++ {
key = append(key, byte(' '))
}
} else {
key = key[0:16]
}
decoded, err := base64.StdEncoding.DecodeString(str)
if err != nil {
return nil, err
}
origBytes, err := decryptAES(decoded, key)
if err != nil {
return nil, err
}
return origBytes, nil
}