첨부된 바운시캐슬 암호화 라이브러리를 참조에 추가하고 사용해야 한다.
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using System;
using System.Security.Cryptography;
using System.IO;
using System.Text;
using System.Xml;
using System.Collections.Generic;
using System.Linq;
using Org.BouncyCastle.Security;
using Org.BouncyCastle.Crypto;
using Org.BouncyCastle.Crypto.Parameters;
/*
사용법
GoogleSignatureVerify gsv = new GoogleSignatureVerify("발급받은 API키");
if (gsv.Verify("결제데이터", 사인데이터))
{
//성공시 처리
}
*/
public class GoogleSignatureVerify
{
RSAParameters _rsaKeyInfo;
public GoogleSignatureVerify(String GooglePublicKey)
{
RsaKeyParameters rsaParameters = (RsaKeyParameters)PublicKeyFactory.CreateKey(Convert.FromBase64String(GooglePublicKey));
byte[] rsaExp = rsaParameters.Exponent.ToByteArray();
byte[] Modulus = rsaParameters.Modulus.ToByteArray();
// Microsoft RSAParameters modulo wants leading zero's removed so create new array with leading zero's removed
int Pos = 0;
for (int i = 0; i < Modulus.Length; i++)
{
if (Modulus[i] == 0)
{
Pos++;
}
else
{
break;
}
}
byte[] rsaMod = new byte[Modulus.Length - Pos];
Array.Copy(Modulus, Pos, rsaMod, 0, Modulus.Length - Pos);
// Fill the Microsoft parameters
_rsaKeyInfo = new RSAParameters()
{
Exponent = rsaExp,
Modulus = rsaMod
};
}
public bool Verify(String Message, String Signature)
{
using (RSACryptoServiceProvider rsa = new RSACryptoServiceProvider())
{
rsa.ImportParameters(_rsaKeyInfo);
return rsa.VerifyData(Encoding.ASCII.GetBytes(Message), "SHA1", Convert.FromBase64String(Signature));
}
}
}
| cs |
BouncyCastle.Crypto.dll
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