using Org.BouncyCastle.Asn1.X509; namespace Org.BouncyCastle.Asn1.Pkcs { /** * a Pkcs#7 signer info object. */ public class SignerInfo : Asn1Encodable { private DerInteger version; private IssuerAndSerialNumber issuerAndSerialNumber; private AlgorithmIdentifier digAlgorithm; private Asn1Set authenticatedAttributes; private AlgorithmIdentifier digEncryptionAlgorithm; private Asn1OctetString encryptedDigest; private Asn1Set unauthenticatedAttributes; 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 SignerInfo( DerInteger version, IssuerAndSerialNumber issuerAndSerialNumber, AlgorithmIdentifier digAlgorithm, Asn1Set authenticatedAttributes, AlgorithmIdentifier digEncryptionAlgorithm, Asn1OctetString encryptedDigest, Asn1Set unauthenticatedAttributes) { this.version = version; this.issuerAndSerialNumber = issuerAndSerialNumber; this.digAlgorithm = digAlgorithm; this.authenticatedAttributes = authenticatedAttributes; this.digEncryptionAlgorithm = digEncryptionAlgorithm; this.encryptedDigest = encryptedDigest; this.unauthenticatedAttributes = unauthenticatedAttributes; } public SignerInfo( Asn1Sequence seq) { var e = seq.GetEnumerator(); e.MoveNext(); version = (DerInteger) e.Current; e.MoveNext(); issuerAndSerialNumber = IssuerAndSerialNumber.GetInstance(e.Current); e.MoveNext(); digAlgorithm = AlgorithmIdentifier.GetInstance(e.Current); e.MoveNext(); var obj = e.Current; if (obj is Asn1TaggedObject tagged) { authenticatedAttributes = Asn1Set.GetInstance(tagged, false); e.MoveNext(); digEncryptionAlgorithm = AlgorithmIdentifier.GetInstance(e.Current); } else { authenticatedAttributes = null; digEncryptionAlgorithm = AlgorithmIdentifier.GetInstance(obj); } e.MoveNext(); encryptedDigest = DerOctetString.GetInstance(e.Current); if (e.MoveNext()) { unauthenticatedAttributes = Asn1Set.GetInstance((Asn1TaggedObject)e.Current, false); } else { unauthenticatedAttributes = null; } } public DerInteger Version { get { return version; } } public IssuerAndSerialNumber IssuerAndSerialNumber { get { return issuerAndSerialNumber; } } public Asn1Set AuthenticatedAttributes { get { return authenticatedAttributes; } } public AlgorithmIdentifier DigestAlgorithm { get { return digAlgorithm; } } public Asn1OctetString EncryptedDigest { get { return encryptedDigest; } } public AlgorithmIdentifier DigestEncryptionAlgorithm { get { return digEncryptionAlgorithm; } } public Asn1Set UnauthenticatedAttributes { get { return unauthenticatedAttributes; } } /** * Produce an object suitable for an Asn1OutputStream. *
         *  SignerInfo ::= Sequence {
         *      version Version,
         *      issuerAndSerialNumber IssuerAndSerialNumber,
         *      digestAlgorithm DigestAlgorithmIdentifier,
         *      authenticatedAttributes [0] IMPLICIT Attributes OPTIONAL,
         *      digestEncryptionAlgorithm DigestEncryptionAlgorithmIdentifier,
         *      encryptedDigest EncryptedDigest,
         *      unauthenticatedAttributes [1] IMPLICIT Attributes OPTIONAL
         *  }
         *
         *  EncryptedDigest ::= OCTET STRING
         *
         *  DigestAlgorithmIdentifier ::= AlgorithmIdentifier
         *
         *  DigestEncryptionAlgorithmIdentifier ::= AlgorithmIdentifier
         * 
*/ public override Asn1Object ToAsn1Object() { Asn1EncodableVector v = new Asn1EncodableVector(version, issuerAndSerialNumber, digAlgorithm); v.AddOptionalTagged(false, 0, authenticatedAttributes); v.Add(digEncryptionAlgorithm, encryptedDigest); v.AddOptionalTagged(false, 1, unauthenticatedAttributes); return new DerSequence(v); } } }