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Android Java Generate Aes Key 256

07.06.2020
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AESEnDecryption.java

Jul 28, 2018 Questions: I had Java Code which generate key AES256 Bit key, have to implement same Code in.Net. Generate an AES-256 Key keytool -genseckey -alias jceksaes -keyalg AES -keysize 256 -storetype JCEKS -keypass mykeypass -storetype jceks -keystore aes- keystore.jck -storepass mystorepass.

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Aes 256 Key Generator

importjavax.crypto.KeyGenerator;
importjavax.crypto.SecretKey;
importjavax.crypto.Cipher;
importjavax.crypto.spec.SecretKeySpec;
importjavax.crypto.spec.IvParameterSpec;
importjava.security.MessageDigest;
importjava.security.spec.AlgorithmParameterSpec;
importandroid.util.Base64;
publicclassAESEnDecryption {
/*
//Sample Code
public static void main(String[] args) throws Exception{
String msg = '123456';
String keyStr = 'abcdef';
String ivStr = 'ABCDEF';
byte[] msg_byte = msg.getBytes('UTF-8');
System.out.println('Before Encrypt: ' + msg);
byte[] ans = AESEnDecryption.encrypt(ivStr, keyStr, msg.getBytes());
System.out.println('After Encrypt: ' + new String(ans, 'UTF-8'));
String ansBase64 = AESEnDecryption.encryptStrAndToBase64(ivStr, keyStr, msg);
System.out.println('After Encrypt & To Base64: ' + ansBase64);
byte[] deans = AESEnDecryption.decrypt(ivStr, keyStr, ans);
System.out.println('After Decrypt: ' + new String(deans, 'UTF-8'));
String deansBase64 = AESEnDecryption.decryptStrAndFromBase64(ivStr, keyStr, ansBase64);
System.out.println('After Decrypt & From Base64: ' + deansBase64);}
*/
publicstaticbyte[] encrypt(StringivStr, StringkeyStr, byte[] bytes) throwsException{
MessageDigest md =MessageDigest.getInstance('MD5');
md.update(ivStr.getBytes());
byte[] ivBytes = md.digest();
MessageDigest sha =MessageDigest.getInstance('SHA-256');
sha.update(keyStr.getBytes());
byte[] keyBytes = sha.digest();
return encrypt(ivBytes, keyBytes, bytes);
}
staticbyte[] encrypt(byte[] ivBytes, byte[] keyBytes, byte[] bytes) throwsException{
AlgorithmParameterSpec ivSpec =newIvParameterSpec(ivBytes);
SecretKeySpec newKey =newSecretKeySpec(keyBytes, 'AES');
Cipher cipher =Cipher.getInstance('AES/CBC/PKCS5Padding');
cipher.init(Cipher.ENCRYPT_MODE, newKey, ivSpec);
return cipher.doFinal(bytes);
}
publicstaticbyte[] decrypt(StringivStr, StringkeyStr, byte[] bytes) throwsException{
MessageDigest md =MessageDigest.getInstance('MD5');
md.update(ivStr.getBytes());
byte[] ivBytes = md.digest();
MessageDigest sha =MessageDigest.getInstance('SHA-256');
sha.update(keyStr.getBytes());
byte[] keyBytes = sha.digest();
return decrypt(ivBytes, keyBytes, bytes);
}
staticbyte[] decrypt(byte[] ivBytes, byte[] keyBytes, byte[] bytes) throwsException{
AlgorithmParameterSpec ivSpec =newIvParameterSpec(ivBytes);
SecretKeySpec newKey =newSecretKeySpec(keyBytes, 'AES');
Cipher cipher =Cipher.getInstance('AES/CBC/PKCS5Padding');
cipher.init(Cipher.DECRYPT_MODE, newKey, ivSpec);
return cipher.doFinal(bytes);
}
publicstaticStringencryptStrAndToBase64(StringivStr, StringkeyStr, StringenStr) throwsException{
byte[] bytes = encrypt(keyStr, keyStr, enStr.getBytes('UTF-8'));
returnnewString(Base64.encode(bytes ,Base64.DEFAULT), 'UTF-8');
}
publicstaticStringdecryptStrAndFromBase64(StringivStr, StringkeyStr, StringdeStr) throwsException{
byte[] bytes = decrypt(keyStr, keyStr, Base64.decode(deStr.getBytes('UTF-8'),Base64.DEFAULT));
returnnewString(bytes, 'UTF-8');
}
}
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