Question

将C#代码转换为java 谢谢大家 急求

byte[] plainTxtBytes =Encoding.UTF-8.GetBytes(PlainText);
SHA256 md5 = SHA256.Create();
byte[] hashString = md5.ComputeHash(plainTxtBytes);
RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();

//加签
rsa.FromXmlString(PrivateKey);//私钥证书
RSAPKCS1SignatureFormatter rsaSign = new RSAPKCS1SignatureFormatter(rsa);
rsaSign.SetHashAlgorithm(DigestAlg);
byte[] bytes = rsaSign.CreateSignature(hashString);

Answer 1

byte[] plainTxtBytes=plainText.getBytes("UTF-8");
MessageDigest messageDigest = MessageDigest.getInstance("SHA-256");
messageDigest.update(plainTxtBytes);
byte[] hashString = messageDigest.digest();
//加签
PKCS8EncodedKeySpec priv_spec = new PKCS8EncodedKeySpec(privateKey);
KeyFactory mykeyFactory = KeyFactory.getInstance("RSA");
PrivateKey privKey = mykeyFactory.generatePrivate(priv_spec);
Signature sig = Signature.getInstance("SHA1withRSA");
sig.initSign(privKey);
sig.update(hashString);
sig.sign();