Rip*_*pul 5 java encryption scala aes go
我有以下用Golang编写的AES加密功能。
func encrypt(key []byte, text string) string {
plaintext := []byte(text)
block, err := aes.NewCipher(key)
if err != nil {
panic(err)
}
ciphertext := make([]byte, aes.BlockSize+len(plaintext))
iv := ciphertext[:aes.BlockSize]
if _, err := io.ReadFull(rand.Reader, iv); err != nil {
panic(err)
}
stream := cipher.NewCFBEncrypter(block, iv)
stream.XORKeyStream(ciphertext[aes.BlockSize:], plaintext)
return base64.URLEncoding.EncodeToString(ciphertext)
}
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我正在努力理解使用Java解密生成的文本的流程。任何帮助将不胜感激!
这是Scala代码,不知道这是什么问题。
def decode(input:String) = {
val keyBytes = Hex.decodeHex("someKey".toCharArray)
val inputWithoutPadding = input.substring(0,input.size - 2)
val inputArr:Seq[Byte] = Hex.decodeHex(inputWithoutPadding.toCharArray)
val skSpec = new SecretKeySpec(keyBytes, "AES")
val iv = new IvParameterSpec(inputArr.slice(0,16).toArray)
val dataToDecrypt = inputArr.slice(16,inputArr.size)
val cipher = Cipher.getInstance("AES/CFB/NoPadding")
cipher.init(Cipher.DECRYPT_MODE, skSpec, iv)
cipher.doFinal(dataToDecrypt.toArray)
}
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Java解码器(另见在线可运行演示,打开并单击“执行”):
\n\nString decode(String base64Text, byte[] key) throws NoSuchPaddingException, NoSuchAlgorithmException, InvalidAlgorithmParameterException, InvalidKeyException, BadPaddingException, IllegalBlockSizeException {\n byte[] inputArr = Base64.getUrlDecoder().decode(base64Text);\n SecretKeySpec skSpec = new SecretKeySpec(key, "AES");\n Cipher cipher = Cipher.getInstance("AES/CFB/NoPadding");\n int blockSize = cipher.getBlockSize();\n IvParameterSpec iv = new IvParameterSpec(Arrays.copyOf(inputArr, blockSize));\n byte[] dataToDecrypt = Arrays.copyOfRange(inputArr, blockSize, inputArr.length);\n cipher.init(Cipher.DECRYPT_MODE, skSpec, iv);\n byte[] result = cipher.doFinal(dataToDecrypt);\n return new String(result, StandardCharsets.UTF_8);\n}\nRun Code Online (Sandbox Code Playgroud)\n\nKevin 在评论中提供了原始 Go 编码器的演示,我们可以在其中看到结果:
\n\nencrypt([]byte("0123456789abcdef"), "test text 123")\nRun Code Online (Sandbox Code Playgroud)\n\n是c1bpFhxn74yzHQs-vgLcW6E5yL8zJfgceEQgYl0=。
让我们看看上面的 Java 解码器如何处理该输入:
\n\nencrypt([]byte("0123456789abcdef"), "test text 123")\nRun Code Online (Sandbox Code Playgroud)\n\n打印test text 123\xe2\x9c\x94
Scala 版本(在线可运行演示):
\n\nString text = "c1bpFhxn74yzHQs-vgLcW6E5yL8zJfgceEQgYl0=";\nbyte[] key = "0123456789abcdef".getBytes();\nSystem.out.println(decode(text, key));\nRun Code Online (Sandbox Code Playgroud)\n\n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,RFC 4648java.util.Base64提供(自 Java 8 起)及其getUrlDecoder().
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