private static byte[] GenerateValidKey(byte[] keyBytes)
{
byte[] ret = new byte[MaxKeyLength];
byte[] hash = HashManager.ToRawHash(keyBytes, HashAlgorithm.Sha512);
Array.Copy(hash, ret, MaxKeyLength);
return(ret);
}
public static RsaKeyPair CreateKeyPair(uint keySize = 4096, RsaKeyEncoding encoding = RsaKeyEncoding.Ber, bool indent = true)
{
using (RSACryptoServiceProvider Csp = new RSACryptoServiceProvider((int)keySize))
{
switch (encoding)
{
case RsaKeyEncoding.Xml:
return(new RsaKeyPair(
publicKey: XDocument.Parse(Csp.ToXmlString(false)).ToString(indent ? SaveOptions.None : SaveOptions.DisableFormatting),
privateKey: XDocument.Parse(Csp.ToXmlString(true)).ToString(indent ? SaveOptions.None : SaveOptions.DisableFormatting)
));
case RsaKeyEncoding.Json:
RSAParameters parameters = Csp.ExportParameters(true);
var pubKey = new
{
Modulus = HashManager.ToBase64(parameters.Modulus !),
Exponent = HashManager.ToBase64(parameters.Exponent !),
};
var privKey = new
{
Modulus = HashManager.ToBase64(parameters.Modulus !),
Exponent = HashManager.ToBase64(parameters.Exponent !),
P = HashManager.ToBase64(parameters.P !),
Q = HashManager.ToBase64(parameters.Q !),
DP = HashManager.ToBase64(parameters.DP !),
DQ = HashManager.ToBase64(parameters.DQ !),
InverseQ = HashManager.ToBase64(parameters.InverseQ !),
D = HashManager.ToBase64(parameters.D !)
};
var options = new JsonSerializerOptions
{
WriteIndented = indent
};
return(new RsaKeyPair(JsonSerializer.Serialize(pubKey, options), JsonSerializer.Serialize(privKey, options)));
case RsaKeyEncoding.Pem:
return(new RsaKeyPair($"{RsaPemPublicKeyInitialString}\n{HashManager.ToBase64(Csp.ExportSubjectPublicKeyInfo(), HashManager.PemLineBreaksLength)}\n{RsaPemPublicKeyFinalString}",
$"{RsaPemPrivateKeyInitialString}\n{HashManager.ToBase64(Csp.ExportPkcs8PrivateKey(), HashManager.PemLineBreaksLength)}\n{RsaPemPrivateKeyFinalString}"));
default:
return(new RsaKeyPair(publicKey: HashManager.ToBase64(Csp.ExportSubjectPublicKeyInfo()), privateKey: HashManager.ToBase64(Csp.ExportPkcs8PrivateKey())));
}
}
}
private static void ParsePrivateKey(RSACryptoServiceProvider csp, string privateKey)
{
try
{
switch (GetKeyEncoding(privateKey))
{
case RsaKeyEncoding.Json:
JsonDocument jsonDoc = JsonDocument.Parse(privateKey, new JsonDocumentOptions {
CommentHandling = JsonCommentHandling.Disallow, MaxDepth = 1
});
JsonElement jsonRoot = jsonDoc.RootElement;
var parameters = new RSAParameters();
parameters.Modulus = HashManager.FromBase64(jsonRoot.GetProperty(nameof(parameters.Modulus)).GetString() !.ToString());
parameters.Exponent = HashManager.FromBase64(jsonRoot.GetProperty(nameof(parameters.Exponent)).GetString() !.ToString());
parameters.P = HashManager.FromBase64(jsonRoot.GetProperty(nameof(parameters.P)).GetString() !.ToString());
parameters.Q = HashManager.FromBase64(jsonRoot.GetProperty(nameof(parameters.Q)).GetString() !.ToString());
parameters.DP = HashManager.FromBase64(jsonRoot.GetProperty(nameof(parameters.DP)).GetString() !.ToString());
parameters.DQ = HashManager.FromBase64(jsonRoot.GetProperty(nameof(parameters.DQ)).GetString() !.ToString());
parameters.InverseQ = HashManager.FromBase64(jsonRoot.GetProperty(nameof(parameters.InverseQ)).GetString() !.ToString());
parameters.D = HashManager.FromBase64(jsonRoot.GetProperty(nameof(parameters.D)).GetString() !.ToString());
csp.ImportParameters(parameters);
break;
case RsaKeyEncoding.Xml:
csp.FromXmlString(privateKey);
break;
case RsaKeyEncoding.Pem:
csp.ImportPkcs8PrivateKey(HashManager.FromBase64(privateKey.Replace(RsaPemPrivateKeyInitialString, string.Empty).Replace(RsaPemPrivateKeyFinalString, string.Empty).Trim()), out int bytesRead1);
break;
default:
csp.ImportPkcs8PrivateKey(HashManager.FromBase64(privateKey), out int bytesRead2);
break;
}
}
catch (Exception)
{
throw new Exception("Unable to parse private key.");
}
}
public static string DecryptFromBase64(string data, string key)
{
return(HashManager.ToString(DecryptRaw(HashManager.FromBase64(data), HashManager.ToByteArray(key))));
}
public static string EncryptToBase64(string data, string key)
{
return(HashManager.ToBase64(EncryptRaw(HashManager.ToByteArray(data), HashManager.ToByteArray(key))));
}
public static Boolean VerifyHexSignature(string data, HashAlgorithm hashAlgorithm, string signature, string publicKey)
{
return(VerifyRaw(HashManager.ToByteArray(data), hashAlgorithm, HashManager.FromHex(signature), publicKey));
}
public static string SignHex(string data, HashAlgorithm hashAlgorithm, string privateKey)
{
return(HashManager.ToHex(SignRaw(HashManager.ToByteArray(data), hashAlgorithm, privateKey)));
}
public static string DecryptFromHex(string data, string privateKey)
{
return(HashManager.ToString(DecryptRaw(HashManager.FromHex(data), privateKey)));
}
public static string EncryptToHex(string plainText, string publicKey)
{
return(HashManager.ToHex(EncryptRaw(HashManager.ToByteArray(plainText), publicKey)));
}