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using System;
using Org.BouncyCastle.Asn1.X509;
namespace Org.BouncyCastle.Asn1.Cms
{
public class SignerInfo
: Asn1Encodable
{
public static SignerInfo GetInstance(object obj)
{
if (obj == null)
return null;
if (obj is SignerInfo signerInfo)
return signerInfo;
return new SignerInfo(Asn1Sequence.GetInstance(obj));
}
public static SignerInfo GetInstance(Asn1TaggedObject taggedObject, bool declaredExplicit)
{
return new SignerInfo(Asn1Sequence.GetInstance(taggedObject, declaredExplicit));
}
private readonly DerInteger m_version;
private readonly SignerIdentifier m_sid;
private readonly AlgorithmIdentifier m_digAlgorithm;
private readonly Asn1Set m_authenticatedAttributes;
private readonly AlgorithmIdentifier m_digEncryptionAlgorithm;
private readonly Asn1OctetString m_encryptedDigest;
private readonly Asn1Set m_unauthenticatedAttributes;
public SignerInfo(SignerIdentifier sid, AlgorithmIdentifier digAlgorithm, Attributes authenticatedAttributes,
AlgorithmIdentifier digEncryptionAlgorithm, Asn1OctetString encryptedDigest,
Attributes unauthenticatedAttributes)
: this(sid, digAlgorithm, Asn1Set.GetInstance(authenticatedAttributes), digEncryptionAlgorithm,
encryptedDigest, Asn1Set.GetInstance(unauthenticatedAttributes))
{
}
public SignerInfo(SignerIdentifier sid, AlgorithmIdentifier digAlgorithm, Asn1Set authenticatedAttributes,
AlgorithmIdentifier digEncryptionAlgorithm, Asn1OctetString encryptedDigest,
Asn1Set unauthenticatedAttributes)
{
m_sid = sid ?? throw new ArgumentNullException(nameof(sid));
m_digAlgorithm = digAlgorithm ?? throw new ArgumentNullException(nameof(digAlgorithm));
m_authenticatedAttributes = authenticatedAttributes;
m_digEncryptionAlgorithm = digEncryptionAlgorithm ?? throw new ArgumentNullException(nameof(digEncryptionAlgorithm));
m_encryptedDigest = encryptedDigest ?? throw new ArgumentNullException(nameof(encryptedDigest));
m_unauthenticatedAttributes = unauthenticatedAttributes;
m_version = sid.IsTagged ? DerInteger.Three : DerInteger.One;
}
private SignerInfo(Asn1Sequence seq)
{
int count = seq.Count, pos = 0;
if (count < 5 || count > 7)
throw new ArgumentException("Bad sequence size: " + count, nameof(seq));
m_version = DerInteger.GetInstance(seq[pos++]);
m_sid = SignerIdentifier.GetInstance(seq[pos++]);
m_digAlgorithm = AlgorithmIdentifier.GetInstance(seq[pos++]);
m_authenticatedAttributes = Asn1Utilities.ReadOptionalContextTagged(seq, ref pos, 0, false, Asn1Set.GetTagged);
m_digEncryptionAlgorithm = AlgorithmIdentifier.GetInstance(seq[pos++]);
m_encryptedDigest = Asn1OctetString.GetInstance(seq[pos++]);
m_unauthenticatedAttributes = Asn1Utilities.ReadOptionalContextTagged(seq, ref pos, 1, false, Asn1Set.GetTagged);
if (pos != count)
throw new ArgumentException("Unexpected elements in sequence", nameof(seq));
}
public DerInteger Version => m_version;
public SignerIdentifier SignerID => m_sid;
public Asn1Set AuthenticatedAttributes => m_authenticatedAttributes;
public AlgorithmIdentifier DigestAlgorithm => m_digAlgorithm;
public Asn1OctetString EncryptedDigest => m_encryptedDigest;
public AlgorithmIdentifier DigestEncryptionAlgorithm => m_digEncryptionAlgorithm;
public Asn1Set UnauthenticatedAttributes => m_unauthenticatedAttributes;
/**
* Produce an object suitable for an Asn1OutputStream.
* <pre>
* SignerInfo ::= Sequence {
* version Version,
* SignerIdentifier sid,
* digestAlgorithm DigestAlgorithmIdentifier,
* authenticatedAttributes [0] IMPLICIT Attributes OPTIONAL,
* digestEncryptionAlgorithm DigestEncryptionAlgorithmIdentifier,
* encryptedDigest EncryptedDigest,
* unauthenticatedAttributes [1] IMPLICIT Attributes OPTIONAL
* }
*
* EncryptedDigest ::= OCTET STRING
*
* DigestAlgorithmIdentifier ::= AlgorithmIdentifier
*
* DigestEncryptionAlgorithmIdentifier ::= AlgorithmIdentifier
* </pre>
*/
public override Asn1Object ToAsn1Object()
{
Asn1EncodableVector v = new Asn1EncodableVector(7);
v.Add(m_version, m_sid, m_digAlgorithm);
v.AddOptionalTagged(false, 0, m_authenticatedAttributes);
v.Add(m_digEncryptionAlgorithm, m_encryptedDigest);
v.AddOptionalTagged(false, 1, m_unauthenticatedAttributes);
return new DerSequence(v);
}
}
}
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