向.net高手求救：C# 实现DSA签名
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需要实现一个和java一样功能的C#函数，
java原代码如下(参考连接：http://ajava.org/course/safe/12328.html)：
public static String sign(byte[] data, String privateKey) throws Exception {
// 解密由base64编码的私钥
byte[] keyBytes = decryptBASE64(privateKey);
// 构造PKCS8EncodedKeySpec对象
PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
// KEY_ALGORITHM 指定的加密算法
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
// 取私钥匙对象
PrivateKey priKey = keyFactory.generatePrivate(pkcs8KeySpec);
// 用私钥对信息生成数字签名
Signature signature = Signature.getInstance(SIGNATURE_ALGORITHM);
signature.initSign(priKey);
signature.update(data);
return encryptBASE64(signature.sign());
}
C#的方法头如下：
public static string sign(byte[] data, string privateKey)
{
// 目的：用私钥privateKey对data进行签名，并得到签名后的字符串，和java签名的方法得到一样的结果
//C# 实现DSA签名 得到一个签名后的字符串
DSACryptoServiceProvider dsa = new DSACryptoServiceProvider();
}
所有回答(2)
0
msdn我看了，还是不知道如何使用已知的私钥。
感谢楼上这位兄弟的关注
0
privatestaticBoolean isValid(String xiString,String xiSig){ AsnKeyParser keyParser =newAsnKeyParser("path/to/key.public"); DSAParameters publicKey = keyParser.ParseDSAPublicKey(); DSACryptoServiceProvider DSA =newDSACryptoServiceProvider(); DSA.ImportParameters(publicKey); DSASignatureDeformatterDSADeformatter=newDSASignatureDeformatter(DSA); UTF8Encoding UTF8 =new UTF8Encoding(); byte[] plainBytes = UTF8.GetBytes(xiString); var sha1 =new SHA1Managed(); var hash = sha1.ComputeHash(plainBytes); byte[] asn1SigBytes =Convert.FromBase64String(xiSig); byte[] sigBytes =ConvertToP1363Signature(asn1SigBytes); Boolean retVal =DSADeformatter.VerifySignature(hash, sigBytes); return retVal;}
privatestaticbyte[]ConvertToP1363Signature(byte[] ASN1Sig){ AsnParser asn =newAsnParser(ASN1Sig); asn.NextSequence(); byte[] r = asn.NextInteger(); byte[] s = asn.NextInteger(); // Returned to caller byte[] p1363Signature =newbyte[40]; if(r.Length>21||(r.Length==21&& r[0]!=0)) { // WTF??? // Reject - signature verification failed } elseif(r.Length==21) { // r[0] = 0 // r[1]'s high bit *should* be set Array.Copy(r,1, p1363Signature,0,20); } elseif(r.Length==20) { // r[0]'s high bit *should not* be set Array.Copy(r,0, p1363Signature,0,20); } else { // fewer than 20 bytes int len = r.Length; int off =20- len; Array.Copy(r,0, p1363Signature, off, len); } if(s.Length>21||(s.Length==21&& s[0]!=0)) { // WTF??? // Reject - signature verification failed } elseif(s.Length==21) { // s[0] = 0 // s[1]'s high bit *should* be set Array.Copy(s,1, p1363Signature,20,20); } elseif(s.Length==20) { // s[0]'s high bit *should not* be set Array.Copy(s,0, p1363Signature,20,20); } else { // fewer than 20 bytes int len = s.Length; int off =40- len; Array.Copy(s,0, p1363Signature, off, len); } return p1363Signature;}这个AsnParser是哪里的呢
