Provider p = new BouncyCastleProvider();
KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance("RSA", p);
keyPairGen.initialize(1024, new SecureRandom());
KeyPair keyPair = keyPairGen.generateKeyPair();
//打印公钥
System.out.println(keyPair.getPublic());
//打印私钥
System.out.println(keyPair.getPrivate());
运行上面的代码，可以得到密钥对
RSA Public Key
modulus: 8caaed0ab3f431f7d2f00fa807b1de68f2c544df9db903481fa8d02ca79d592a92e55821af62859bff457ddf3a1eadea8376ff7efdd3b1a10dd9d385a678a369547bd2f87ccc91faae407013456522f21ffd5fcc6db2c8dcf4978492f8595305a683ee4074d2a06daa3d683f1d911910561df9e01355b7899aa479d934357223
public exponent: 10001
RSA Private CRT Key
modulus: 8caaed0ab3f431f7d2f00fa807b1de68f2c544df9db903481fa8d02ca79d592a92e55821af62859bff457ddf3a1eadea8376ff7efdd3b1a10dd9d385a678a369547bd2f87ccc91faae407013456522f21ffd5fcc6db2c8dcf4978492f8595305a683ee4074d2a06daa3d683f1d911910561df9e01355b7899aa479d934357223
public exponent: 10001
private exponent: 3bafcb24df769e3d29a3f300b9431fbc2846cc12963a0aca6fa491b060eec306ed8da2f7a81385ddcb531135c6d37db8245039d9089aeaa40bdc8184143edc1712fedfcbe982cf7c3070afc6589975ca2df47bb4051b5b7800b4ff753702d5cf08cb2d9ad222cfc7a79eaf214e0ef6e199e988dcc49b81f1b902293fbc1a9a01
primeP: d7efc6d32cec18ff137e92eb10e32350a170d4631f64043943adf274c45bf082fbbb48cca9bccd32db5b8df72e28204da3bbe9fac087f14fb83d1cb4d29a2629
primeQ: a6c42433f4b66915877d8445e1bab8e537452a1e2d776a9c5c8a1f221eda35dcd33232cd0e918930df06c3022494d2043c71a65fbfdfaf204d284cec10a5676b
primeExponentP: c9f0a2071186c6a59d2c8ce72a46d0daf1ef9ba00b5634a0fd0b2aa84a8e14b1da0b3ebcafac3256724fffc6feb265eb55c941bacfdd122e54854a584c6ffe69
primeExponentQ: 9eee6afa410bded62fcc45553c2d71acb1a1eee3d7bce9139f75daf9efa15297e38701b73f5d1ffc3d70fa447e8c7e229f60488914199f930f358b29a72b9b85
crtCoefficient: 9a8326c21bfdd6121d9c36d8bca080fd18f204d111684bce45e94befedcff4d2b83d466b46f19916ac0c8ed8e13884786b4a20a53393946f4567b86970ab84f3
22342342342342
Process finished with exit code 0
其中，RSA 公钥是两个参数是要发给前端客户的
RSA Public Key
modulus: 8caaed0ab3f431f7d2f00fa807b1de68f2c544df9db903481fa8d02ca79d592a92e55821af62859bff457ddf3a1eadea8376ff7efdd3b1a10dd9d385a678a369547bd2f87ccc91faae407013456522f21ffd5fcc6db2c8dcf4978492f8595305a683ee4074d2a06daa3d683f1d911910561df9e01355b7899aa479d934357223
public exponent: 10001
前端JavaScript代码， 依赖 security.js
https://files.cnblogs.com/files/xiaojf/security.js
<html>
<body>
<script src="security.js" type="text/javascript"></script>
<script>
var key = RSAUtils.getKeyPair('10001', '', 'c6e442535e1dd6968e4ccd7735299278d989cb938a2f97c1081c4e6796895a3063510592e2e90ed427d5a604428ce46391dcb2ba6b5f4a86af1347237d1de489a0dc2f68a1f9a265d1ec350fccd8a76be5004211cee5bf05a083afa17cf335871b141e5c4329f69d1a3546613e0fa7833b7a253c460e5bb0c075dacfccfd6d0d');
console.log(RSAUtils.encryptedString(key, '22342342342342'));
</script>
</body>
</html>
运行页面后，可以得到加密后的字符串
9448472ec3294304fdec01a3700e918b5797eb4698f7e80f8877a4acccd157b6630b25cdd581c2bf57cd7f55ed42a2caea914eadba29950fceb9af1a1fcdb13f67ce030a1f0dd91ba45af885b28b085cfe423a9cc7a47333433214d24a4e4d954dfe65d59d896502a15b636ff0c7a23339ddbb066c8a7f699c4ebd3a2415225b
拷贝到Java后台进行解密，操作，可以得到结果
String hexModulus = "c6e442535e1dd6968e4ccd7735299278d989cb938a2f97c1081c4e6796895a3063510592e2e90ed427d5a604428ce46391dcb2ba6b5f4a86af1347237d1de489a0dc2f68a1f9a265d1ec350fccd8a76be5004211cee5bf05a083afa17cf335871b141e5c4329f69d1a3546613e0fa7833b7a253c460e5bb0c075dacfccfd6d0d";
String hexPrivateExponent = "1ce625c15c66146a983d82cd493c95242ae35603ba73b4f810682c838d0f4bbb242d5c2bc9cee12b41bff1108b369885fadaa05f0f68bafeb915445e5cd006645eb816d9a8d89b155aeb8478a60325cf4d7e69c12b3076a4cf31b8c24530e7f13533826bc7e87ddf65b7ccc65951bd7c34238b9f08a1e8a1c2c4dd762c50309";
// 这就是上面html输出的密文
String encryptPassword = "9448472ec3294304fdec01a3700e918b5797eb4698f7e80f8877a4acccd157b6630b25cdd581c2bf57cd7f55ed42a2caea914eadba29950fceb9af1a1fcdb13f67ce030a1f0dd91ba45af885b28b085cfe423a9cc7a47333433214d24a4e4d954dfe65d59d896502a15b636ff0c7a23339ddbb066c8a7f699c4ebd3a2415225b"; Provider provider = new BouncyCastleProvider(); KeyFactory keyFac = KeyFactory.getInstance("RSA", provider); RSAPrivateKeySpec priKeySpec = new RSAPrivateKeySpec(new BigInteger(hexModulus, 16), new BigInteger(hexPrivateExponent, 16)); // 生成用于解密的私钥 RSAPrivateKey pk = (RSAPrivateKey) keyFac.generatePrivate(priKeySpec); // 解密 Cipher cipher = Cipher.getInstance("RSA", provider); cipher.init(2, pk); byte[] rawPasswordByte = cipher.doFinal(Hex.decodeHex(encryptPassword.toCharArray())); System.out.println(StringUtils.reverse(new String(rawPasswordByte)));
得到结果
22342342342342