常用加密方法

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