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AES/CBC/PKCS5Padding implementation by Golang
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package main | |
import ( | |
"bytes" | |
"crypto/aes" | |
"crypto/cipher" | |
"fmt" | |
) | |
func main() { | |
src := "NIJOAHS000000000" | |
key := []byte("1234567890123456") | |
fmt.Println("SOURCE!:", []byte(src)) | |
encrypted := AESEncrypt(src, key) | |
fmt.Println("ENCRYPT:", encrypted) | |
decrypted := AESDecrypt(encrypted, key) | |
fmt.Println("DECRYPT:", decrypted) | |
} | |
func AESEncrypt(src string, key []byte) []byte { | |
block, err := aes.NewCipher(key) | |
if err != nil { | |
fmt.Println("key error1", err) | |
} | |
if src == "" { | |
fmt.Println("plain content empty") | |
} | |
ecb := cipher.NewCBCEncrypter(block, []byte{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}) | |
content := []byte(src) | |
content = PKCS5Padding(content, block.BlockSize()) | |
crypted := make([]byte, len(content)) | |
ecb.CryptBlocks(crypted, content) | |
return crypted | |
} | |
func AESDecrypt(crypt []byte, key []byte) []byte { | |
block, err := aes.NewCipher(key) | |
if err != nil { | |
fmt.Println("key error1", err) | |
} | |
if len(crypt) == 0 { | |
fmt.Println("plain content empty") | |
} | |
ecb := cipher.NewCBCDecrypter(block, []byte{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}) | |
decrypted := make([]byte, len(crypt)) | |
ecb.CryptBlocks(decrypted, crypt) | |
return PKCS5Trimming(decrypted) | |
} | |
func PKCS5Padding(ciphertext []byte, blockSize int) []byte { | |
padding := blockSize - len(ciphertext)%blockSize | |
padtext := bytes.Repeat([]byte{byte(padding)}, padding) | |
return append(ciphertext, padtext...) | |
} | |
func PKCS5Trimming(encrypt []byte) []byte { | |
padding := encrypt[len(encrypt)-1] | |
return encrypt[:len(encrypt)-int(padding)] | |
} |
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