в 17:43, 31 мая 2010

2010-05-31T17:43:48Z

Admin: 1 версия

2010-05-31T14:47:42Z

1 версия

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== Cipher: DECRYPT_MODE ==



<source lang="java">

import java.security.Key;
import java.security.Security;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
public class Main {
public static void main(String[] args) throws Exception {
// Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
byte[] input = "input".getBytes();
byte[] ivBytes = "1234567812345678".getBytes();
Cipher cipher = Cipher.getInstance("AES/CTR/NoPadding", "BC");
KeyGenerator generator = KeyGenerator.getInstance("AES", "BC");
generator.init(128);
Key encryptionKey = generator.generateKey();
System.out.println("key : " + new String(encryptionKey.getEncoded()));
cipher.init(Cipher.ENCRYPT_MODE, encryptionKey, new IvParameterSpec(ivBytes));
byte[] cipherText = new byte[cipher.getOutputSize(input.length)];
int ctLength = cipher.update(input, 0, input.length, cipherText, 0);
ctLength += cipher.doFinal(cipherText, ctLength);
Key decryptionKey = new SecretKeySpec(encryptionKey.getEncoded(), encryptionKey.getAlgorithm());
cipher.init(Cipher.DECRYPT_MODE, decryptionKey, new IvParameterSpec(ivBytes));
byte[] plainText = new byte[cipher.getOutputSize(ctLength)];
int ptLength = cipher.update(cipherText, 0, ctLength, plainText, 0);
ptLength += cipher.doFinal(plainText, ptLength);
System.out.println("plain : " + new String(plainText));
}
}

</source>



== Cipher: doFinal(byte[] arg0, int arg1) ==



<source lang="java">

import java.security.Key;
import java.security.Security;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
public class Main {
public static void main(String[] args) throws Exception {
// Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
byte[] input = "input".getBytes();
byte[] ivBytes = "1234567812345678".getBytes();
Cipher cipher = Cipher.getInstance("AES/CTR/NoPadding", "BC");
KeyGenerator generator = KeyGenerator.getInstance("AES", "BC");
generator.init(128);
Key encryptionKey = generator.generateKey();
System.out.println("key : " + new String(encryptionKey.getEncoded()));
cipher.init(Cipher.ENCRYPT_MODE, encryptionKey, new IvParameterSpec(ivBytes));
byte[] cipherText = new byte[cipher.getOutputSize(input.length)];
int ctLength = cipher.update(input, 0, input.length, cipherText, 0);
ctLength += cipher.doFinal(cipherText, ctLength);
Key decryptionKey = new SecretKeySpec(encryptionKey.getEncoded(), encryptionKey.getAlgorithm());
cipher.init(Cipher.DECRYPT_MODE, decryptionKey, new IvParameterSpec(ivBytes));
byte[] plainText = new byte[cipher.getOutputSize(ctLength)];
int ptLength = cipher.update(cipherText, 0, ctLength, plainText, 0);
ptLength += cipher.doFinal(plainText, ptLength);
System.out.println("plain : " + new String(plainText));
}
}

</source>



== Cipher: ENCRYPT_MODE ==



<source lang="java">

import java.security.Key;
import java.security.Security;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
public class Main {
public static void main(String[] args) throws Exception {
// Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
byte[] input = "input".getBytes();
byte[] ivBytes = "1234567812345678".getBytes();
Cipher cipher = Cipher.getInstance("AES/CTR/NoPadding", "BC");
KeyGenerator generator = KeyGenerator.getInstance("AES", "BC");
generator.init(128);
Key encryptionKey = generator.generateKey();
System.out.println("key : " + new String(encryptionKey.getEncoded()));
cipher.init(Cipher.ENCRYPT_MODE, encryptionKey, new IvParameterSpec(ivBytes));
byte[] cipherText = new byte[cipher.getOutputSize(input.length)];
int ctLength = cipher.update(input, 0, input.length, cipherText, 0);
ctLength += cipher.doFinal(cipherText, ctLength);
Key decryptionKey = new SecretKeySpec(encryptionKey.getEncoded(), encryptionKey.getAlgorithm());
cipher.init(Cipher.DECRYPT_MODE, decryptionKey, new IvParameterSpec(ivBytes));
byte[] plainText = new byte[cipher.getOutputSize(ctLength)];
int ptLength = cipher.update(cipherText, 0, ctLength, plainText, 0);
ptLength += cipher.doFinal(plainText, ptLength);
System.out.println("plain : " + new String(plainText));
}
}

</source>



== Cipher: getInstance(String arg0, String arg1) ==



<source lang="java">

import java.security.Key;
import java.security.Security;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
public class Main {
public static void main(String[] args) throws Exception {
// Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
byte[] input = "input".getBytes();
byte[] ivBytes = "1234567812345678".getBytes();
Cipher cipher = Cipher.getInstance("AES/CTR/NoPadding", "BC");
KeyGenerator generator = KeyGenerator.getInstance("AES", "BC");
generator.init(128);
Key encryptionKey = generator.generateKey();
System.out.println("key : " + new String(encryptionKey.getEncoded()));
cipher.init(Cipher.ENCRYPT_MODE, encryptionKey, new IvParameterSpec(ivBytes));
byte[] cipherText = new byte[cipher.getOutputSize(input.length)];
int ctLength = cipher.update(input, 0, input.length, cipherText, 0);
ctLength += cipher.doFinal(cipherText, ctLength);
Key decryptionKey = new SecretKeySpec(encryptionKey.getEncoded(), encryptionKey.getAlgorithm());
cipher.init(Cipher.DECRYPT_MODE, decryptionKey, new IvParameterSpec(ivBytes));
byte[] plainText = new byte[cipher.getOutputSize(ctLength)];
int ptLength = cipher.update(cipherText, 0, ctLength, plainText, 0);
ptLength += cipher.doFinal(plainText, ptLength);
System.out.println("plain : " + new String(plainText));
}
}

</source>



== Cipher: init(int arg0, Key arg1, AlgorithmParameterSpec arg2) ==



<source lang="java">

import java.security.Key;
import java.security.Security;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
public class Main {
public static void main(String[] args) throws Exception {
// Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
byte[] input = "input".getBytes();
byte[] ivBytes = "1234567812345678".getBytes();
Cipher cipher = Cipher.getInstance("AES/CTR/NoPadding", "BC");
KeyGenerator generator = KeyGenerator.getInstance("AES", "BC");
generator.init(128);
Key encryptionKey = generator.generateKey();
System.out.println("key : " + new String(encryptionKey.getEncoded()));
cipher.init(Cipher.ENCRYPT_MODE, encryptionKey, new IvParameterSpec(ivBytes));
byte[] cipherText = new byte[cipher.getOutputSize(input.length)];
int ctLength = cipher.update(input, 0, input.length, cipherText, 0);
ctLength += cipher.doFinal(cipherText, ctLength);
Key decryptionKey = new SecretKeySpec(encryptionKey.getEncoded(), encryptionKey.getAlgorithm());
cipher.init(Cipher.DECRYPT_MODE, decryptionKey, new IvParameterSpec(ivBytes));
byte[] plainText = new byte[cipher.getOutputSize(ctLength)];
int ptLength = cipher.update(cipherText, 0, ctLength, plainText, 0);
ptLength += cipher.doFinal(plainText, ptLength);
System.out.println("plain : " + new String(plainText));
}
}

</source>



== Cipher: update(byte[] arg0, int arg1, int arg2, byte[] arg3, int arg4) ==



<source lang="java">

import java.security.Key;
import java.security.Security;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
public class Main {
public static void main(String[] args) throws Exception {
// Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
byte[] input = "input".getBytes();
byte[] ivBytes = "1234567812345678".getBytes();
Cipher cipher = Cipher.getInstance("AES/CTR/NoPadding", "BC");
KeyGenerator generator = KeyGenerator.getInstance("AES", "BC");
generator.init(128);
Key encryptionKey = generator.generateKey();
System.out.println("key : " + new String(encryptionKey.getEncoded()));
cipher.init(Cipher.ENCRYPT_MODE, encryptionKey, new IvParameterSpec(ivBytes));
byte[] cipherText = new byte[cipher.getOutputSize(input.length)];
int ctLength = cipher.update(input, 0, input.length, cipherText, 0);
ctLength += cipher.doFinal(cipherText, ctLength);
Key decryptionKey = new SecretKeySpec(encryptionKey.getEncoded(), encryptionKey.getAlgorithm());
cipher.init(Cipher.DECRYPT_MODE, decryptionKey, new IvParameterSpec(ivBytes));
byte[] plainText = new byte[cipher.getOutputSize(ctLength)];
int ptLength = cipher.update(cipherText, 0, ctLength, plainText, 0);
ptLength += cipher.doFinal(plainText, ptLength);
System.out.println("plain : " + new String(plainText));
}
}

</source>

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в 17:43, 31 мая 2010

Admin: 1 версия