/// <summary>
/// Creates a X509-formatted public key string from a given RSA key pair.
/// </summary>
public static string GetPublicKeyFormattedString(RSA keyPair)
{
if (keyPair == null)
{
return(string.Empty);
}
var publicKey = keyPair.ExportParameters(false);
var publicKeyBytes = RsaKeyUtils.PublicKeyToX509(publicKey);
return(string.Format(FORMAT_PUBLIC_KEY, Convert.ToBase64String(publicKeyBytes)));
}
/// <summary>
/// Creates a public-key-only RSA key pair from X509-formatted public key string.
/// </summary>
public static RSA CreatePublicKeyFromPublicKeyFormattedString(string publicKeyString)
{
if (string.IsNullOrWhiteSpace(publicKeyString))
{
return(null);
}
var publicKeyStringTrimmed = publicKeyString
.Replace(PUBLIC_KEY_START, string.Empty)
.Replace(PUBLIC_KEY_END, string.Empty);
return(RsaKeyUtils.DecodePublicKey(Convert.FromBase64String(publicKeyStringTrimmed)));
}
/// <summary>
/// Creates an RSA key pair from PKCS8-formatted private key string.
/// </summary>
public static RSA CreateKeyPairFromPrivateKeyFormattedString(string privateKeyString)
{
if (string.IsNullOrWhiteSpace(privateKeyString))
{
return(null);
}
var privateKeyStringTrimmed = privateKeyString
.Replace(PRIVATE_KEY_START, string.Empty)
.Replace(PRIVATE_KEY_END, string.Empty);
return(RsaKeyUtils.DecodePrivateKeyInfo(Convert.FromBase64String(privateKeyStringTrimmed)));
}
/// <summary>
/// If possible, creates a PKCS8-formatted private key string from a given RSA key pair; else returns an empty
/// string.
/// </summary>
public static string GetPrivateKeyFormattedString(RSA keyPair)
{
if (keyPair == null)
{
return(string.Empty);
}
try
{
var privateKey = keyPair.ExportParameters(true);
var privateKeyBytes = RsaKeyUtils.PrivateKeyToPkcs8(privateKey);
return(string.Format(FORMAT_PRIVATE_KEY, Convert.ToBase64String(privateKeyBytes)));
}
catch (SecurityException)
{
return(string.Empty);
}
}