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Examples for decrypting message
C#
Groovy
Java
Node.js
Php
Phyton
Ruby
Scala
​
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using System;
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using System.Linq;
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using System.Text;
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using Org.BouncyCastle.Crypto.Engines;
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using Org.BouncyCastle.Crypto.Modes;
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using Org.BouncyCastle.Crypto.Parameters;
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namespace DecryptionExample
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{
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// You need to install bccrypto-csharp from BouncyCastle. Please see BouncyCastle page.
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class Program
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{
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static void Main(string[] args)
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{
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string keyFromConfiguration = "000102030405060708090a0b0c0d0e0f000102030405060708090a0b0c0d0e0f";
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// Data from server
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string ivFromHttpHeader = "000000000000000000000000";
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string authTagFromHttpHeader = "CE573FB7A41AB78E743180DC83FF09BD";
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string httpBody = "0A3471C72D9BE49A8520F79C66BBD9A12FF9";
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// Convert data to process
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byte[] key = ToByteArray(keyFromConfiguration);
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byte[] iv = ToByteArray(ivFromHttpHeader);
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byte[] authTag = ToByteArray(authTagFromHttpHeader);
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byte[] encryptedText = ToByteArray(httpBody);
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byte[] cipherText = encryptedText.Concat(authTag).ToArray();
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// Prepare decryption
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GcmBlockCipher cipher = new GcmBlockCipher(new AesFastEngine());
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AeadParameters parameters = new AeadParameters(new KeyParameter(key), 128, iv);
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cipher.Init(false, parameters);
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// Decrypt
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var plainText = new byte[cipher.GetOutputSize(cipherText.Length)];
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var len = cipher.ProcessBytes(cipherText, 0, cipherText.Length, plainText, 0);
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cipher.DoFinal(plainText, len);
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Console.WriteLine(Encoding.ASCII.GetString(plainText));
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}
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static byte[] ToByteArray(string HexString)
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{
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int NumberChars = HexString.Length;
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byte[] bytes = new byte[NumberChars / 2];
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for (int i = 0; i < NumberChars; i += 2)
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{
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bytes[i / 2] = Convert.ToByte(HexString.Substring(i, 2), 16);
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}
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return bytes;
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}
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}
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}
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​
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import org.bouncycastle.jce.provider.BouncyCastleProvider
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import javax.crypto.spec.IvParameterSpec
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import javax.crypto.spec.SecretKeySpec
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import java.security.Security
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// For Java and JVM-based languages, you might need to install unrestricted policy file for JVM,
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// which is provided by Sun. Please refer BouncyCastle FAQ if you get
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// java.lang.SecurityException: Unsupported keysize or algorithm parameters or
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// java.security.InvalidKeyException: Illegal key size.
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​
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// If you cannot install unrestricted policy file for JVM because of some reason, you can try with reflection: See here.
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class Cipher {
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static void main(String[] args) {
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Security.addProvider(new BouncyCastleProvider())
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// Data from configuration
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def keyFromConfiguration = "000102030405060708090a0b0c0d0e0f000102030405060708090a0b0c0d0e0f"
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// Data from server
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def ivFromHttpHeader = "000000000000000000000000"
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def authTagFromHttpHeader = "CE573FB7A41AB78E743180DC83FF09BD"
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def httpBody = "0A3471C72D9BE49A8520F79C66BBD9A12FF9"
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// Convert data to process
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def key = keyFromConfiguration.decodeHex()
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def iv = ivFromHttpHeader.decodeHex()
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def authTag = authTagFromHttpHeader.decodeHex() as Byte[]
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def encryptedText = httpBody.decodeHex() as Byte[]
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// Unlike other programming language, We have to append auth tag at the end of encrypted text
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def cipherText = encryptedText + authTag as Byte[]
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// Prepare decryption
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def keySpec = new SecretKeySpec(key, 0, 32, "AES")
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def cipher = javax.crypto.Cipher.getInstance("AES/GCM/NoPadding")
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cipher.init(javax.crypto.Cipher.DECRYPT_MODE, keySpec, new IvParameterSpec(iv))
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// Decrypt
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def result = cipher.doFinal(cipherText)
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println(new String(result, "UTF-8"))
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}
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}
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​
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import com.google.common.base.Charsets;
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import org.apache.commons.lang3.ArrayUtils;
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import org.bouncycastle.jce.provider.BouncyCastleProvider;
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import javax.crypto.Cipher;
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import javax.crypto.spec.IvParameterSpec;
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import javax.crypto.spec.SecretKeySpec;
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import javax.xml.bind.DatatypeConverter;
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import java.security.Security;
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// For Java and JVM-based languages, you might need to install unrestricted policy file for JVM,
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// which is provided by Sun. Please refer BouncyCastle FAQ if you get
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// java.lang.SecurityException: Unsupported keysize or algorithm parameters or
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// java.security.InvalidKeyException: Illegal key size.
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​
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// If you cannot install unrestricted policy file for JVM because of some reason, you can try with reflection: See here.
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public class Decryption
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{
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public static void main(String[] args) throws Exception
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{
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Security.addProvider(new BouncyCastleProvider());
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// Data from configuration
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String keyFromConfiguration = "000102030405060708090a0b0c0d0e0f000102030405060708090a0b0c0d0e0f";
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// Data from server
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String ivFromHttpHeader = "000000000000000000000000";
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String authTagFromHttpHeader = "CE573FB7A41AB78E743180DC83FF09BD";
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String httpBody = "0A3471C72D9BE49A8520F79C66BBD9A12FF9";
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// Convert data to process
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byte[] key = DatatypeConverter.parseHexBinary(keyFromConfiguration);
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byte[] iv = DatatypeConverter.parseHexBinary(ivFromHttpHeader);
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byte[] authTag = DatatypeConverter.parseHexBinary(authTagFromHttpHeader);
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byte[] encryptedText = DatatypeConverter.parseHexBinary(httpBody);
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// Unlike other programming language, We have to append auth tag at the end of encrypted text in Java
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byte[] cipherText = ArrayUtils.addAll(encryptedText, authTag);
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// Prepare decryption
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SecretKeySpec keySpec = new SecretKeySpec(key, 0, 32, "AES");
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Cipher cipher = Cipher.getInstance("AES/GCM/NoPadding");
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cipher.init(Cipher.DECRYPT_MODE, keySpec, new IvParameterSpec(iv));
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// Decrypt
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byte[] bytes = cipher.doFinal(cipherText);
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System.out.println(new String(bytes, Charsets.UTF_8));
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}
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}
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​
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var crypto = require("crypto");
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// Data from configuration
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var secretFromConfiguration = "000102030405060708090a0b0c0d0e0f000102030405060708090a0b0c0d0e0f";
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// Data from server
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var ivfromHttpHeader = "000000000000000000000000";
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var authTagFromHttpHeader = "CE573FB7A41AB78E743180DC83FF09BD";
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var httpBody = "0A3471C72D9BE49A8520F79C66BBD9A12FF9";
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// Convert data to process
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var key = new Buffer(secretFromConfiguration, "hex");
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var iv = new Buffer(ivfromHttpHeader, "hex");
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var authTag = new Buffer(authTagFromHttpHeader, "hex");
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var cipherText = new Buffer(httpBody, "hex");
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// Prepare descryption
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var decipher = crypto.createDecipheriv("aes-256-gcm", key, iv);
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decipher.setAuthTag(authTag);
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// Decrypt
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var result = decipher.update(cipherText) + decipher.final();
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console.log(result);
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​
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<?php
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/* Php 7.1 or later */
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$key_from_configuration = "000102030405060708090a0b0c0d0e0f000102030405060708090a0b0c0d0e0f";
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$iv_from_http_header = "000000000000000000000000";
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$auth_tag_from_http_header = "CE573FB7A41AB78E743180DC83FF09BD";
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$http_body = "0A3471C72D9BE49A8520F79C66BBD9A12FF9";
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$key = hex2bin($key_from_configuration);
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$iv = hex2bin($iv_from_http_header);
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$auth_tag = hex2bin($auth_tag_from_http_header);
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$cipher_text = hex2bin($http_body);
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$result = openssl_decrypt($cipher_text, "aes-256-gcm", $key, OPENSSL_RAW_DATA, $iv, $auth_tag);
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print($result);
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/* Php prior to 7.1 */
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/* Please refer Using Libsodium in PHP Projects */
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$key_from_configuration = "000102030405060708090a0b0c0d0e0f000102030405060708090a0b0c0d0e0f";
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$iv_from_http_header = "000000000000000000000000";
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$auth_tag_from_http_header = "CE573FB7A41AB78E743180DC83FF09BD";
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$http_body = "0A3471C72D9BE49A8520F79C66BBD9A12FF9";
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$key = hex2bin($key_from_configuration);
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$iv = hex2bin($iv_from_http_header);
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$cipher_text = hex2bin($http_body . $auth_tag_from_http_header);
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$result = \Sodium\crypto_aead_aes256gcm_decrypt($cipher_text, NULL, $iv, $key);
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print($result);
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?>
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​
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import os
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import binascii
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from cryptography.hazmat.primitives.ciphers import Cipher, algorithms, modes
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from cryptography.hazmat.backends import default_backend
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# Data from configuration
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key_from_configuration = "000102030405060708090a0b0c0d0e0f000102030405060708090a0b0c0d0e0f"
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# Data from server
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iv_from_http_header = "000000000000000000000000"
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auth_tag_from_http_header = "CE573FB7A41AB78E743180DC83FF09BD"
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http_body = "0A3471C72D9BE49A8520F79C66BBD9A12FF9"
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# Convert data to process
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key = binascii.unhexlify(key_from_configuration)
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iv = binascii.unhexlify(iv_from_http_header)
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auth_tag = binascii.unhexlify(auth_tag_from_http_header)
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cipher_text = binascii.unhexlify(http_body)
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# Prepare decryption
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decryptor = Cipher(algorithms.AES(key), modes.GCM(iv, auth_tag), backend = default_backend()).decryptor()
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# Decrypt
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result = decryptor.update(cipher_text) + decryptor.finalize()
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print(result)
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​
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require("openssl")
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# Convert hexadecimal string
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def convert(hex)
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return [hex].pack("H*")
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end
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# Create new decipher
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def new_decipher(key, iv)
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cipher = OpenSSL::Cipher.new("aes-256-gcm")
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cipher.decrypt
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cipher.key = key
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cipher.iv = iv
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return cipher
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end
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# Data from configuration
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key_from_configuration = "000102030405060708090a0b0c0d0e0f000102030405060708090a0b0c0d0e0f"
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# Data from server
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iv_from_http_header = "000000000000000000000000"
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auth_tag_from_http_header = "CE573FB7A41AB78E743180DC83FF09BD"
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http_body = "0A3471C72D9BE49A8520F79C66BBD9A12FF9"
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# Convert data to process
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key = convert(key_from_configuration)
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iv = convert(iv_from_http_header)
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auth_tag = convert(auth_tag_from_http_header)
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cipher_text = convert(http_body)
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# Prepare decryption
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decipher = new_decipher(key, iv)
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decipher.auth_tag = auth_tag
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# Decrypt
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result = decipher.update(cipher_text) + decipher.final
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puts result
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​
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import java.nio.charset.Charset;
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import java.security.Security
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import java.security.SecureRandom;
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import javax.crypto.spec.IvParameterSpec;
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import javax.crypto.spec.SecretKeySpec;
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import javax.xml.bind.DatatypeConverter;
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import org.bouncycastle.jce.provider.BouncyCastleProvider
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// For Java and JVM-based languages, you might need to install unrestricted policy file for JVM,
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// which is provided by Sun. Please refer BouncyCastle FAQ if you get
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// java.lang.SecurityException: Unsupported keysize or algorithm parameters or
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// java.security.InvalidKeyException: Illegal key size.
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​
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// If you cannot install unrestricted policy file for JVM because of some reason, you can try with reflection: See here.
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object Cipher {
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def main(args: Array[String]) = {
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Security.addProvider(new BouncyCastleProvider())
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// Data from configuration
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val keyFromConfiguration = "000102030405060708090a0b0c0d0e0f000102030405060708090a0b0c0d0e0f"
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// Data from server
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val ivFromHttpHeader = "000000000000000000000000"
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val authTagFromHttpHeader = "CE573FB7A41AB78E743180DC83FF09BD"
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val httpBody = "0A3471C72D9BE49A8520F79C66BBD9A12FF9"
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// Convert data to process
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val key = hexToBin(keyFromConfiguration)
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val iv = hexToBin(ivFromHttpHeader)
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val authTag = hexToBin(authTagFromHttpHeader)
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val encryptedText = hexToBin(httpBody)
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// Unlike other programming language, We have to append auth tag at the end of encrypted text
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val cipherText = encryptedText ++ authTag
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// Prepare decryption
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val keySpec = new SecretKeySpec(key, 0, 32, "AES")
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val cipher = javax.crypto.Cipher.getInstance("AES/GCM/NoPadding")
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cipher.init(javax.crypto.Cipher.DECRYPT_MODE, keySpec, new IvParameterSpec(iv))
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// Decrypt
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val result = cipher.doFinal(cipherText)
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println(new String(result, "UTF-8"))
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}
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def hexToBin(hex: String) : Array[Byte] = {
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return DatatypeConverter.parseHexBinary(hex)
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}
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}
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Last modified 1yr ago
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