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// Package symcrypt contains common symmetric encryption functions.
package symcrypt
import (
"crypto/aes"
"crypto/cipher"
"crypto/rand"
)
// DecryptCBC decrypt bytes using a key and IV with AES in CBC mode.
func DecryptCBC(data, iv, key []byte) (decryptedData []byte, err error) {
aesCrypt, err := aes.NewCipher(key)
if err != nil {
return
}
ivBytes := append([]byte{}, iv...)
decryptedData = make([]byte, len(data))
aesCBC := cipher.NewCBCDecrypter(aesCrypt, ivBytes)
aesCBC.CryptBlocks(decryptedData, data)
return
}
// EncryptCBC encrypt data using a key and IV with AES in CBC mode.
func EncryptCBC(data, iv, key []byte) (encryptedData []byte, err error) {
aesCrypt, err := aes.NewCipher(key)
if err != nil {
return
}
ivBytes := append([]byte{}, iv...)
encryptedData = make([]byte, len(data))
aesCBC := cipher.NewCBCEncrypter(aesCrypt, ivBytes)
aesCBC.CryptBlocks(encryptedData, data)
return
}
// MakeRandom is a helper that makes a new buffer full of random data.
func MakeRandom(length int) ([]byte, error) {
bytes := make([]byte, length)
_, err := rand.Read(bytes)
return bytes, err
}
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