3DES加密解密调用示例

在java中调用sun公司提供的DES加密解密算法时需要使用到$JAVA_HOME/jre/lib/目录下如下的个jar包

jcejar

security/US_export_policyjar

security/local_policyjar

ext/sunjce_providerjar

Java运行时会自动加载这些包因此对于带main函数的应用程序不需要设置到CLASSPATH环境变量中对于WEB应用不需要把这些包加到WEBINF/lib目录下

以下是java中调用sun公司提供的DES加密解密算法的样本代码

/*字符串 DESede(DES) 加密*/

import javasecurity*;

import javaxcrypto*;

import javaxcryptospecSecretKeySpec;

public class ThreeDes {

private static final String Algorithm = DESede; //定义 加密算法可用 DESDESedeBlowfish

//keybyte为加密密钥长度为字节

//src为被加密的数据缓沖区（源）

public static byte[] encryptMode(byte[] keybyte byte[] src) {

try {

//生成密钥

SecretKey deskey = new SecretKeySpec(keybyte Algorithm);

//加密

Cipher c = CiphergetInstance(Algorithm);

cinit(CipherENCRYPT_MODE deskey);

return cdoFinal(src);

}

catch (javasecurityNoSuchAlgorithmException e) {

eprintStackTrace();

}

catch (javaxcryptoNoSuchPaddingException e) {

eprintStackTrace();

}

catch (javalangException e) {

eprintStackTrace();

}

return null;

}

//keybyte为加密密钥长度为字节

//src为加密后的缓沖区

public static byte[] decryptMode(byte[] keybyte byte[] src) {

try {

//生成密钥

SecretKey deskey = new SecretKeySpec(keybyte Algorithm);

//解密

Cipher c = CiphergetInstance(Algorithm);

cinit(CipherDECRYPT_MODE deskey);

return cdoFinal(src);

}

catch (javasecurityNoSuchAlgorithmException e) {

eprintStackTrace();

}

catch (javaxcryptoNoSuchPaddingException e) {

eprintStackTrace();

}

catch (javalangException e) {

eprintStackTrace();

}

return null;

}

//转换成十六进制字符串

public static String bytehex(byte[] b) {

String hs=;

String stmp=;

for (int n=;n<blength;n++) {

stmp=(javalangIntegertoHexString(b[n] & XFF));

if (stmplength()==) hs=hs++stmp;

else hs=hs+stmp;

if (n<blength) hs=hs+:;

}

return hstoUpperCase();

}

public static void main(String[] args){

//添加新安全算法如果用JCE就要把它添加进去

SecurityaddProvider(new comsuncryptoproviderSunJCE());

final byte[] keyBytes = {x x xF x

(byte)x x x x x x x x

(byte)xCB (byte)xDD x x x x x

(byte)x x x x (byte)xE

}; //字节的密钥

String szSrc = This is a DES test 测试;

Systemoutprintln(加密前的字符串: + szSrc);

byte[] encoded = encryptMode(keyBytes szSrcgetBytes());

Systemoutprintln(加密后的字符串: + new String(encoded));

byte[] srcBytes = decryptMode(keyBytes encoded);

Systemoutprintln(解密后的字符串: + (new String(srcBytes)));

}

}