Java 解码器(另请参阅在线可运行演示,打开并单击“执行”):
String decode(String base64Text, byte[] key) throws NoSuchPaddingException, NoSuchAlgorithmException, InvalidAlgorithmParameterException, InvalidKeyException, BadPaddingException, IllegalBlockSizeException {
byte[] inputArr = Base64.getUrlDecoder().decode(base64Text);
SecretKeySpec skSpec = new SecretKeySpec(key, "AES");
Cipher cipher = Cipher.getInstance("AES/CFB/NoPadding");
int blockSize = cipher.getBlockSize();
IvParameterSpec iv = new IvParameterSpec(Arrays.copyOf(inputArr, blockSize));
byte[] dataToDecrypt = Arrays.copyOfRange(inputArr, blockSize, inputArr.length);
cipher.init(Cipher.DECRYPT_MODE, skSpec, iv);
byte[] result = cipher.doFinal(dataToDecrypt);
return new String(result, StandardCharsets.UTF_8);
}
凯文在评论中提出这个演示原始 Go 编码器的结果,我们可以看到以下结果:
encrypt([]byte("0123456789abcdef"), "test text 123")
is c1bpFhxn74yzHQs-vgLcW6E5yL8zJfgceEQgYl0=
.
让我们看看上面的 Java 解码器如何处理该输入:
String text = "c1bpFhxn74yzHQs-vgLcW6E5yL8zJfgceEQgYl0=";
byte[] key = "0123456789abcdef".getBytes();
System.out.println(decode(text, key));
Prints test text 123
✔
斯卡拉版本(在线可运行演示):
def decode(input:String, key:String) = {
val cipher = Cipher.getInstance("AES/CFB/NoPadding")
val blockSize = cipher.getBlockSize()
val keyBytes = key.getBytes()
val inputArr = Base64.getUrlDecoder().decode(input)
val skSpec = new SecretKeySpec(keyBytes, "AES")
val iv = new IvParameterSpec(inputArr.slice(0, blockSize).toArray)
val dataToDecrypt = inputArr.slice(blockSize, inputArr.size)
cipher.init(Cipher.DECRYPT_MODE, skSpec, iv)
new String(cipher.doFinal(dataToDecrypt.toArray))
}
def main(args: Array[String]) {
print(decode("c1bpFhxn74yzHQs-vgLcW6E5yL8zJfgceEQgYl0=", "0123456789abcdef"));
}
我认为 Scala 版本中唯一的错误是使用Hex.decodeHex
。您需要一个使用 URL 安全字母表的 Base64 解码器,如 RFC 4648 中所述,该解码器java.util.Base64
提供(自 Java 8 起)及其getUrlDecoder()
.