/// <summary>
/// 采用RSA非对称算法对文本进行签名
/// </summary>
/// <param name="privateKeyXml">私钥的XML文本</param>
/// <param name="text">需要签名的文本内容（即文件体）</param>
/// <returns>返回签名后的base64编码密文（即文件头）</returns>
public static string PrivateKeyTextSignatureData(string privateKeyXml, string text)
{
string hashText = Md5Encryptor.Hash(text);
byte[] hashBytes = Convert.FromBase64String(hashText);
RSACryptoServiceProvider p = new RSACryptoServiceProvider();
p.FromXmlString(privateKeyXml);
RSAPKCS1SignatureFormatter f = new RSAPKCS1SignatureFormatter(p);
f.SetHashAlgorithm("SHA");
byte[] bytes = f.CreateSignature(hashBytes);
return(Convert.ToBase64String(bytes));
}
/// <summary>
/// 采用RSA非对称算法对文本进行签名验证
/// </summary>
/// <param name="publicKeyXml">公钥的XML文本</param>
/// <param name="text">需要验证签名的文本内容（即文件体）</param>
/// <param name="signatureBase64Text">已签名的base64密文（即文件头）</param>
/// <returns>如果文件内容与文件头匹配，则返回true，否则返回false</returns>
public static bool PublicKeyTextValidateData(string publicKeyXml, string text, string signatureBase64Text)
{
RSACryptoServiceProvider p = new RSACryptoServiceProvider();
p.FromXmlString(publicKeyXml);
RSAPKCS1SignatureDeformatter f = new RSAPKCS1SignatureDeformatter(p);
f.SetHashAlgorithm("SHA");
byte[] bytes = Convert.FromBase64String(Md5Encryptor.Hash(text));
byte[] bytes2 = Convert.FromBase64String(signatureBase64Text);
if (f.VerifySignature(bytes, bytes2))
{
return(true);
}
else
{
return(false);
}
}