Name
Class javax.crypto.Cipher
Description
This class represents a cryptographic cipher, either symmetric or
asymmetric. To get a cipher for a particular algorithm, call one of
the getInstance()
methods. You should specify an
algorithm name, a cipher mode, and a padding scheme. The cipher
should be initialized for encryption or decryption using the
init()
method and an appropriate key. To actually
perform the encryption or decryption, use update()
and doFinal()
. The following example shows how to
encrypt plaintext using a DES cipher in ECB mode with PKCS#5 padding:
public byte[] simpleEncrypt(byte[] plaintext, Key key) throws Exception { Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding"); cipher.init(Cipher.ENCRYPT_MODE, key); byte[] ciphertext = cipher.doFinal(stringBytes); return ciphertext; }
Class Definition
public class javax.crypto.Cipher extends java.lang.Object { // Constants public static final int DECRYPT_MODE; public static final int ENCRYPT_MODE; // Constructors protected Cipher(CipherSpi, Provider, String); // Class Methods public static final Cipher getInstance(String); public static final Cipher getInstance(String, String); // Instance Methods public final byte[] doFinal(); public final byte[] doFinal(byte[]); public final int doFinal(byte[], int); public final byte[] doFinal(byte[], int, int);
public final int doFinal(byte[], int, int, byte[]); public final int doFinal(byte[], int, int, byte[], int); public final int getBlockSize(); public final byte[] getIV(); ...
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