常用加解密工具类（MD5、SHA、DES、AES、RSA）

2016-12-20 13:15| 发布者: zhangjf| 查看: 455| 评论: 0

摘要: 加解密工具类，实现了常用的加解密类。包括单向加密：MD5、SHA；对称加密：DES、AES；非对称加密：RSA 完整代码见：https://git.oschina.net/bayern.com/SecureUtils.git 同时提供ant打包脚本。下面 ...

加解密工具类，实现了常用的加解密类。包括单向加密：MD5、SHA；对称加密：DES、AES；非对称加密：RSA
完整代码见：https://git.oschina.net/bayern.com/SecureUtils.git 同时提供ant打包脚本。

下面展示部分关键代码

MD5 单向加密：
/**
* 返回MD5单向加密后的十六进制字符串
* @param data
* @return
* @throws Exception
*/
public String getEncryptForHex(byte[] data) throws Exception
{
byte[] digestData = encrypt(data);
StringBuffer hex = new StringBuffer();
for(int i = 0; i < digestData.length; i++)
{
int h = ((int)digestData[i]) & 0XFF;
if(h < 16)
{
hex.append("0");
}
hex.append(Integer.toHexString(h));
}
return hex.toString();
}
DES 对称加密类：
@Override
public byte[] encrypt(byte[] data) throws Exception
{
if(secretKey == null || "".equals(secretKey))
{
throw new Exception("scretKey need to exists");
}
SecretKey md5Key = getKey(secretKey);
Cipher cipher = Cipher.getInstance(ALGORITHM);
cipher.init(Cipher.ENCRYPT_MODE, md5Key);
return cipher.doFinal(data);
}
@Override
public byte[] decrypt(byte[] data) throws Exception
{
if(secretKey == null || "".equals(secretKey))
{
throw new Exception("scretKey need to exists");
}
SecretKey md5Key = getKey(secretKey);
Cipher cipher = Cipher.getInstance(ALGORITHM);
cipher.init(Cipher.DECRYPT_MODE, md5Key);
return cipher.doFinal(data);
}
RSA 非对称加密。私钥加密 & 私钥解密 & 私钥签名
@Override
public byte[] encrypt(byte[] data) throws Exception
{
PrivateKey rsaPrivateKey = getRSAPrivateKey();
Cipher cipher = Cipher.getInstance(ALGORITHM);
cipher.init(Cipher.ENCRYPT_MODE, rsaPrivateKey);
return cipher.doFinal(data);
}
@Override
public byte[] decrypt(byte[] data) throws Exception
{
PrivateKey rsaPrivateKey = getRSAPrivateKey();
Cipher cipher = Cipher.getInstance(ALGORITHM);
cipher.init(Cipher.DECRYPT_MODE, rsaPrivateKey);
return cipher.update(data);
}
/**
* 使用私钥对数据进行签名
* @param data
* @return
* @throws Exception
*/
public String sign(byte[] data) throws Exception
{
PrivateKey rsaPrivateKey = getRSAPrivateKey();
Signature signature = Signature.getInstance(SIGN_ALGORITHM);
signature.initSign(rsaPrivateKey);
signature.update(data);
return encoder(signature.sign());
}
RSA 非对称加密。公钥加密 & 公钥解密 & 公钥校验签名
@Override
public byte[] encrypt(byte[] data) throws Exception
{
if(publicKey == null || "".equals(publicKey))
{
throw new Exception("publicKey is need exists");
}
PublicKey rsaPublicKey = getRSAPublicKey(publicKey);
Cipher cipher = Cipher.getInstance(ALGORITHM);
cipher.init(Cipher.ENCRYPT_MODE, rsaPublicKey);
return cipher.doFinal(data);
}
@Override
public byte[] decrypt(byte[] data) throws Exception
{
if(publicKey == null || "".equals(publicKey))
{
throw new Exception("publicKey is need exists");
}
PublicKey rsaPublicKey = getRSAPublicKey(publicKey);
Cipher cipher = Cipher.getInstance(ALGORITHM);
cipher.init(Cipher.DECRYPT_MODE, rsaPublicKey);
return cipher.doFinal(data);
}
/**
* 使用公钥校验签名
* @param data
* @param sign
* @return
* @throws Exception
*/
public boolean verifySign(byte[] data, String sign) throws Exception
{
if(publicKey == null || "".equals(publicKey))
{
throw new Exception("publicKey is need exists");
}
PublicKey rsaPublicKey = getRSAPublicKey(publicKey);
Signature signature = Signature.getInstance(SIGN_ALGORITHM);
signature.initVerify(rsaPublicKey);
signature.update(data);
return signature.verify(decoder(sign));
}

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常用加解密工具类（MD5、SHA、DES、AES、RSA）

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