private Asn1Object GetSingleValuedSignedAttribute()

in net/JetBrains.SignatureVerifier/src/Crypt/BC/SignerInformation.cs [687:722]

32 lines of code
7 McCabe index (conditional complexity)


    private Asn1Object GetSingleValuedSignedAttribute(
      DerObjectIdentifier attrOID, string printableName)
    {
      AttributeTable unsignedAttrTable = this.UnsignedAttributes;
      if (unsignedAttrTable != null
          && unsignedAttrTable.GetAll(attrOID).Count > 0)
      {
        throw new CmsException("The " + printableName
                                      + " attribute MUST NOT be an unsigned attribute");
      }

      AttributeTable signedAttrTable = this.SignedAttributes;
      if (signedAttrTable == null)
      {
        return null;
      }

      Asn1EncodableVector v = signedAttrTable.GetAll(attrOID);
      switch (v.Count)
      {
        case 0:
          return null;
        case 1:
          Attribute t = (Attribute)v[0];
          Asn1Set attrValues = t.AttrValues;

          if (attrValues.Count != 1)
            throw new CmsException("A " + printableName
                                        + " attribute MUST have a single attribute value");

          return attrValues[0].ToAsn1Object();
        default:
          throw new CmsException("The SignedAttributes in a signerInfo MUST NOT include multiple instances of the "
                                 + printableName + " attribute");
      }
    }