RSAPrivateKeyAsn.cs

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using System.Formats.Asn1;
using System.Numerics;
 
namespace System.Security.Cryptography.Asn1;
 
internal struct RSAPrivateKeyAsn
{
    internal int Version;
 
    internal BigInteger Modulus;
 
    internal BigInteger PublicExponent;
 
    internal BigInteger PrivateExponent;
 
    internal BigInteger Prime1;
 
    internal BigInteger Prime2;
 
    internal BigInteger Exponent1;
 
    internal BigInteger Exponent2;
 
    internal BigInteger Coefficient;
 
    internal static RSAPrivateKeyAsn Decode(ReadOnlyMemory<byte> encoded, AsnEncodingRules ruleSet)
    {
        return Decode(Asn1Tag.Sequence, encoded, ruleSet);
    }
 
    internal static RSAPrivateKeyAsn Decode(Asn1Tag expectedTag, ReadOnlyMemory<byte> encoded, AsnEncodingRules ruleSet)
    {
        try
        {
            AsnValueReader reader = new AsnValueReader(encoded.Span, ruleSet);
            DecodeCore(ref reader, expectedTag, encoded, out var decoded);
            reader.ThrowIfNotEmpty();
            return decoded;
        }
        catch (AsnContentException inner)
        {
            throw new CryptographicException(System.SR.Cryptography_Der_Invalid_Encoding, inner);
        }
    }
 
    private static void DecodeCore(ref AsnValueReader reader, Asn1Tag expectedTag, ReadOnlyMemory<byte> rebind, out RSAPrivateKeyAsn decoded)
    {
        decoded = default(RSAPrivateKeyAsn);
        AsnValueReader asnValueReader = reader.ReadSequence(expectedTag);
        if (!asnValueReader.TryReadInt32(out decoded.Version))
        {
            asnValueReader.ThrowIfNotEmpty();
        }
        decoded.Modulus = asnValueReader.ReadInteger();
        decoded.PublicExponent = asnValueReader.ReadInteger();
        decoded.PrivateExponent = asnValueReader.ReadInteger();
        decoded.Prime1 = asnValueReader.ReadInteger();
        decoded.Prime2 = asnValueReader.ReadInteger();
        decoded.Exponent1 = asnValueReader.ReadInteger();
        decoded.Exponent2 = asnValueReader.ReadInteger();
        decoded.Coefficient = asnValueReader.ReadInteger();
        asnValueReader.ThrowIfNotEmpty();
    }
}