public static bool TryGetECDsaKeys(this ScpConfig.SecretariumKeyConfig config, string password, out byte[] publicKeyRaw, out byte[] privateKeyRaw)
{
publicKeyRaw = null;
privateKeyRaw = null;
if (config == null)
{
return(false);
}
if (string.IsNullOrEmpty(config.keys))
{
return(false);
}
byte[] keys = config.keys.FromBase64String();
if (!string.IsNullOrEmpty(config.iv) && !string.IsNullOrEmpty(config.salt) && !string.IsNullOrEmpty(password)) // encrypted
{
var iv = config.iv.FromBase64String();
if (iv.Length != 12)
{
return(false);
}
var salt = config.salt.FromBase64String();
if (salt.Length != 32)
{
return(false);
}
var strongPwd = ByteHelper.Combine(salt, password.ToBytes()).HashSha256();
try
{
keys = AESGCMHelper.AesGcmDecrypt(keys, strongPwd, iv);
}
catch (Exception)
{
return(false);
}
}
if (string.IsNullOrEmpty(config.version)) // raw + pkcs8
{
if (keys.Length != 1 + 64 + 36 + 32 + 6 + 64) // 65 bytes uncompressed raw pub key + 138 bytes pkcs8 pri key
{
return(false);
}
publicKeyRaw = keys.Extract(1, 64);
privateKeyRaw = keys.Extract(65 + 36, 32);
}
else if (config.version == "1") // jwt
{
// TODO: parse jwt
return(false);
}
return(true);
}
public static bool ToSecretariumKey(this X509Certificate2 x509, string password, out ScpConfig.SecretariumKeyConfig config)
{
config = null;
var publicKey = x509.GetECDsaPublicKey() as ECDsaCng;
if (publicKey == null)
{
return(false);
}
if (publicKey.HashAlgorithm != CngAlgorithm.Sha256 || publicKey.KeySize != 256 || publicKey.Key.Algorithm != CngAlgorithm.ECDsaP256)
{
return(false);
}
var publicKeyRaw = publicKey.ExportPublicKeyRaw();
if (publicKeyRaw == null)
{
return(false);
}
var privateKey = x509.GetECDsaPrivateKey() as ECDsaCng;
if (privateKey == null)
{
return(false);
}
var privatKeyRaw = privateKey.ExportPrivateKeyRaw();
if (privatKeyRaw == null)
{
return(false);
}
// Built pkcs8 manually because privateKey.Key.ForceExport(CngKeyBlobFormat.Pkcs8PrivateBlob) return 165 bytes instead of 138. TODO investigate
var privatKeyPkcs8 = ByteHelper.Combine(
new byte[] { 48, 129, 135, 2, 1, 0, 48, 19, 6, 7, 42, 134, 72, 206, 61, 2, 1, 6, 8, 42, 134, 72, 206, 61, 3, 1, 7, 4, 109, 48, 107, 2, 1, 1, 4, 32 },
privatKeyRaw,
new byte[] { 161, 68, 3, 66, 0, 4 },
publicKeyRaw
);
var salt = ByteHelper.GetRandom(32);
var iv = ByteHelper.GetRandom(12);
var strongPwd = ByteHelper.Combine(salt, password.ToBytes()).HashSha256();
var keys = ByteHelper.Combine(new byte[] { 4 }, publicKeyRaw, privatKeyPkcs8);
var encryptedKeys = AESGCMHelper.AesGcmEncrypt(keys, strongPwd, iv);
config = new ScpConfig.SecretariumKeyConfig
{
iv = iv.ToBase64String(false),
salt = salt.ToBase64String(false),
keys = encryptedKeys.ToBase64String(false)
};
return(true);
}