/// <summary>
/// Build a challenge transaction you can use for Stellar Web Authentication.
/// </summary>
/// <param name="serverKeypair">Server signing keypair</param>
/// <param name="clientAccountId">The client account id that needs authentication</param>
/// <param name="homeDomain">The server home domain</param>
/// <param name="nonce">48 bytes long cryptographic-quality random data</param>
/// <param name="now">The datetime from which the transaction is valid</param>
/// <param name="timeout">The transaction lifespan</param>
/// <param name="network">The network the transaction will be submitted to</param>
/// <returns>The challenge transaction</returns>
/// <exception cref="ArgumentNullException"></exception>
/// <exception cref="ArgumentException"></exception>
public static Transaction BuildChallengeTransaction(KeyPair serverKeypair, string clientAccountId,
string homeDomain, byte[] nonce = null, DateTimeOffset?now = null, TimeSpan?timeout = null,
Network network = null)
{
if (string.IsNullOrEmpty(clientAccountId))
{
throw new ArgumentNullException(nameof(clientAccountId));
}
if (StrKey.DecodeVersionByte(clientAccountId) != StrKey.VersionByte.ACCOUNT_ID)
{
throw new InvalidWebAuthenticationException($"{nameof(clientAccountId)} is not a valid account id");
}
var clientAccountKeypair = KeyPair.FromAccountId(clientAccountId);
return(BuildChallengeTransaction(serverKeypair, clientAccountKeypair, homeDomain, nonce, now, timeout,
network));
}
/// <summary>
/// Creates a new Stellar KeyPair from a strkey encoded Stellar account ID.
/// </summary>
/// <param name="accountId">accountId The strkey encoded Stellar account ID.</param>
/// <returns>
/// <see cref="KeyPair" />
/// </returns>
public static KeyPair FromAccountId(string accountId)
{
byte[] decoded = StrKey.DecodeStellarAccountId(accountId);
return(FromPublicKey(decoded));
}
/// <summary>
/// Creates a new Stellar KeyPair from a strkey encoded Stellar secret seed.
/// </summary>
/// <param name="seed">eed Char array containing strkey encoded Stellar secret seed.</param>
/// <returns>
/// <see cref="KeyPair" />
/// </returns>
public static KeyPair FromSecretSeed(string seed)
{
byte[] bytes = StrKey.DecodeStellarSecretSeed(seed);
return(FromSecretSeed(bytes));
}