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using System;
using Org.BouncyCastle.Asn1.X509;
namespace Org.BouncyCastle.Asn1.Ocsp
{
public class Signature
: Asn1Encodable
{
public static Signature GetInstance(object obj)
{
if (obj == null)
return null;
if (obj is Signature signature)
return signature;
return new Signature(Asn1Sequence.GetInstance(obj));
}
public static Signature GetInstance(Asn1TaggedObject obj, bool explicitly)
{
return new Signature(Asn1Sequence.GetInstance(obj, explicitly));
}
private readonly AlgorithmIdentifier m_signatureAlgorithm;
private readonly DerBitString m_signatureValue;
private readonly Asn1Sequence m_certs;
public Signature(AlgorithmIdentifier signatureAlgorithm, DerBitString signatureValue)
: this(signatureAlgorithm, signatureValue, null)
{
}
public Signature(AlgorithmIdentifier signatureAlgorithm, DerBitString signatureValue, Asn1Sequence certs)
{
m_signatureAlgorithm = signatureAlgorithm ?? throw new ArgumentNullException(nameof(signatureAlgorithm));
m_signatureValue = signatureValue ?? throw new ArgumentNullException(nameof(signatureValue));
m_certs = certs;
}
private Signature(Asn1Sequence seq)
{
int count = seq.Count;
if (count < 2 || count > 3)
throw new ArgumentException("Bad sequence size: " + count, nameof(seq));
int pos = 0;
m_signatureAlgorithm = AlgorithmIdentifier.GetInstance(seq[pos++]);
m_signatureValue = DerBitString.GetInstance(seq[pos++]);
m_certs = Asn1Utilities.ReadOptionalContextTagged(seq, ref pos, 0, true, Asn1Sequence.GetInstance);
if (pos != count)
throw new ArgumentException("Unexpected elements in sequence", nameof(seq));
}
public AlgorithmIdentifier SignatureAlgorithm => m_signatureAlgorithm;
public DerBitString SignatureValue => m_signatureValue;
public byte[] GetSignatureOctets() => m_signatureValue.GetOctets();
public Asn1Sequence Certs => m_certs;
/**
* Produce an object suitable for an Asn1OutputStream.
* <pre>
* Signature ::= Sequence {
* signatureAlgorithm AlgorithmIdentifier,
* signature BIT STRING,
* certs [0] EXPLICIT Sequence OF Certificate OPTIONAL}
* </pre>
*/
public override Asn1Object ToAsn1Object()
{
Asn1EncodableVector v = new Asn1EncodableVector(3);
v.Add(m_signatureAlgorithm, m_signatureValue);
v.AddOptionalTagged(true, 0, m_certs);
return new DerSequence(v);
}
}
}
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