Java by API/javax.crypto/Cipher

Содержание

1 Cipher: DECRYPT_MODE
2 Cipher: doFinal(byte[] arg0, int arg1)
3 Cipher: ENCRYPT_MODE
4 Cipher: getInstance(String arg0, String arg1)
5 Cipher: init(int arg0, Key arg1, AlgorithmParameterSpec arg2)
6 Cipher: update(byte[] arg0, int arg1, int arg2, byte[] arg3, int arg4)

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>

Java by API/javax.crypto/Cipher

Содержание

Cipher: DECRYPT_MODE

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

Cipher: ENCRYPT_MODE

Cipher: getInstance(String arg0, String arg1)

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

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

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