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using System;
using Org.BouncyCastle.Math;
namespace Org.BouncyCastle.Crypto.Signers
{
/// <summary>
/// An interface for different encoding formats for DSA signatures.
/// </summary>
public interface IDsaEncoding
{
/// <summary>Decode the (r, s) pair of a DSA signature.</summary>
/// <param name="n">The order of the group that r, s belong to.</param>
/// <param name="encoding">An encoding of the (r, s) pair of a DSA signature.</param>
/// <returns>The (r, s) of a DSA signature, stored in an array of exactly two elements, r followed by s.</returns>
BigInteger[] Decode(BigInteger n, byte[] encoding);
/// <summary>Encode the (r, s) pair of a DSA signature.</summary>
/// <param name="n">The order of the group that r, s belong to.</param>
/// <param name="r">The r value of a DSA signature.</param>
/// <param name="s">The s value of a DSA signature.</param>
/// <returns>An encoding of the DSA signature given by the provided (r, s) pair.</returns>
byte[] Encode(BigInteger n, BigInteger r, BigInteger s);
#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
int Encode(BigInteger n, BigInteger r, BigInteger s, Span<byte> output);
#endif
int GetMaxEncodingSize(BigInteger n);
}
}
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