1.MD5

[代码]java代码：

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public class MD5Strategy

{

public String encode(String src)

{

try

{

MessageDigest md = MessageDigest.getInstance("MD5");

byte[] encodeBytes = md.digest(src.getBytes());

return Hex.encodeHexString(encodeBytes);

}

catch (NoSuchAlgorithmException e)

{

e.printStackTrace();

}

return null;

}

public String decode(String src)

{

throw new RuntimeException("MD5 no decode");

}

2.SHA

[代码]java代码：

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public class SHAStrategy

{

public String encode(String src)

{

try

{

MessageDigest md = MessageDigest.getInstance("SHA");

md.update(src.getBytes());

return Hex.encodeHexString(md.digest());

}

catch (NoSuchAlgorithmException e)

{

e.printStackTrace();

}

return null;

}

public String decode(String src)

{

throw new RuntimeException("SHA no decode");

}

3.DES

[代码]java代码：

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public class DESStrategy

{

private Cipher cipher;

private SecretKey generateKey;

public String encode(String src)

{

try

{

KeyGenerator keyGenerator = KeyGenerator.getInstance("DES");

keyGenerator.init(56);//size

SecretKey secretKey = keyGenerator.generateKey();

byte[] keyBytes = secretKey.getEncoded();

DESKeySpec desKeySpec = new DESKeySpec(keyBytes);

SecretKeyFactory secretKeyFactory = SecretKeyFactory.getInstance("DES");

generateKey = secretKeyFactory.generateSecret(desKeySpec);

cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");

cipher.init(Cipher.ENCRYPT_MODE, generateKey);

byte[] resultBytes = cipher.doFinal(src.getBytes());

return Hex.encodeHexString(resultBytes);

}

catch (Exception e)

{

e.printStackTrace();

}

return null;

}

public String decode(String src)

{

try

{

cipher.init(Cipher.DECRYPT_MODE, generateKey);

byte[] result = Hex.decodeHex(src.toCharArray());

return new String(cipher.doFinal(result));

}

catch(Exception e)

{

e.printStackTrace();

}

return null;

}

4.AES

[代码]java代码：

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public class AESStrategy

{

private Cipher cipher;

private SecretKey generateKey;

public String encode(String src)

{

try

{

KeyGenerator keyGenerator = KeyGenerator.getInstance("AES");

keyGenerator.init(128);//size

SecretKey secretKey = keyGenerator.generateKey();

byte[] keyBytes = secretKey.getEncoded();

generateKey = new SecretKeySpec(keyBytes, "AES");

cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");

cipher.init(Cipher.ENCRYPT_MODE, generateKey);

byte[] resultBytes = cipher.doFinal(src.getBytes());

return Hex.encodeHexString(resultBytes);

}

catch (Exception e)

{

e.printStackTrace();

}

return null;

}

public String decode(String src)

{

try

{

cipher.init(Cipher.DECRYPT_MODE, generateKey);

byte[] result = Hex.decodeHex(src.toCharArray());

return new String(cipher.doFinal(result));

}

catch(Exception e)

{

e.printStackTrace();

}

return null;

}

5.RSA

[代码]java代码：

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public class RSAStrategy implements IStrategy

{

private RSAPublicKey rsaPublicKey;

private RSAPrivateKey rsaPrivateKey;

public String encode(String src)

{

try

{

//初始化密钥

KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("RSA");

keyPairGenerator.initialize(512);

KeyPair keyPair = keyPairGenerator.generateKeyPair();

rsaPublicKey = (RSAPublicKey)keyPair.getPublic();

rsaPrivateKey = (RSAPrivateKey)keyPair.getPrivate();

//私钥加密公钥解密

PKCS8EncodedKeySpec pkcs8EncodedKeySpec

= new PKCS8EncodedKeySpec(rsaPrivateKey.getEncoded());

KeyFactory keyFactory = KeyFactory.getInstance("RSA");

PrivateKey privateKey = keyFactory.generatePrivate(pkcs8EncodedKeySpec);

Cipher cipher = Cipher.getInstance("RSA");

cipher.init(Cipher.ENCRYPT_MODE, privateKey);

byte[] resultBytes = cipher.doFinal(src.getBytes());

return Hex.encodeHexString(resultBytes);

}

catch(Exception e)

{

e.printStackTrace();

}

return null;

}

public String decode(String src)

{

try

{

//私钥加密公钥解密

X509EncodedKeySpec x509EncodedKeySpec =

new X509EncodedKeySpec(rsaPublicKey.getEncoded());

KeyFactory keyFactory = KeyFactory.getInstance("RSA");

PublicKey publicKey = keyFactory.generatePublic(x509EncodedKeySpec);

Cipher cipher = Cipher.getInstance("RSA");

cipher.init(Cipher.DECRYPT_MODE, publicKey);

byte[] resultBytes = cipher.doFinal(Hex.decodeHex(src.toCharArray()));

return new String(resultBytes);

}

catch(Exception e)

{

e.printStackTrace();

}

return null;

}

原文链接：http://www.apkbus.com/blog-780485-77077.html

ITPub博客

常用加密方法

1.MD5

[代码]java代码：

[代码]java代码：

[代码]java代码：

[代码]java代码：

[代码]java代码：

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