Support multisignature and signaturechain

Signed-off-by: andreas hilti <69210561+andreas-hilti@users.noreply.github.com>

src/CycloneDX.Core/Json/Utils.cs

@@ -96,6 +96,7 @@ public static JsonSerializerOptions GetJsonSerializerOptions()
             options.Converters.Add(new HyphenEnumConverter<Data.DataType>());
             options.Converters.Add(new HyphenEnumConverter<ActivityType>());
             options.Converters.Add(new HyphenEnumConverter<EnergySource>());
+            options.Converters.Add(new SignatureChoiceConverter());
 
             options.Converters.Add(new JsonStringEnumConverter());
 

src/CycloneDX.Core/Models/Bom.cs

@@ -195,6 +195,6 @@ public int NonNullableVersion
         [JsonIgnore]
         public XmlElement XmlSignature { get; set; }
         [XmlIgnore]
-        public Signature Signature { get; set; }
+        public SignatureChoice Signature { get; set; }
     }
 }

src/CycloneDX.Core/Models/Component.cs

@@ -282,7 +282,7 @@ public bool NonNullableModified
         [JsonIgnore]
         public XmlElement XmlSignature { get; set; }
         [XmlIgnore]
-        public Signature Signature { get; set; }
+        public SignatureChoice Signature { get; set; }
 
         public override bool Equals(object obj)
         {

src/CycloneDX.Core/Models/Composition.cs

@@ -71,7 +71,7 @@ public enum AggregateType
         [JsonIgnore]
         public XmlElement XmlSignature { get; set; }
         [XmlIgnore]
-        public Signature Signature { get; set; }
+        public SignatureChoice Signature { get; set; }
 
         public System.Xml.Schema.XmlSchema GetSchema() {
             return null;

src/CycloneDX.Core/Models/Declarations/Affirmation.cs

@@ -39,7 +39,7 @@ public class Affirmation
         [JsonIgnore]
         public XmlElement XmlSignature { get; set; }
         [XmlIgnore]
-        public Signature Signature { get; set; }
+        public SignatureChoice Signature { get; set; }
 
     }
 }

src/CycloneDX.Core/Models/Declarations/Attestation.cs

@@ -44,7 +44,7 @@ public class Attestation : IEquatable<Attestation>
         public List<System.Xml.XmlElement> Any { get; set; }
 
         [XmlIgnore]
-        public Signature Signature { get; set; }
+        public SignatureChoice Signature { get; set; }
 
         public override bool Equals(object obj)
         {

src/CycloneDX.Core/Models/Declarations/Claim.cs

@@ -68,7 +68,7 @@ public class Claim : IEquatable<Claim>, IHasBomRef
         [JsonIgnore]
         public XmlElement XmlSignature { get; set; }
         [XmlIgnore]
-        public Signature Signature { get; set; }
+        public SignatureChoice Signature { get; set; }
 
         public override bool Equals(object obj)
         {

src/CycloneDX.Core/Models/Declarations/Declarations.cs

@@ -58,7 +58,7 @@ public class Declarations
         [JsonIgnore]
         public XmlElement XmlSignature { get; set; }
         [XmlIgnore]
-        public Signature Signature { get; set; }
+        public SignatureChoice Signature { get; set; }
 
     }
 

src/CycloneDX.Core/Models/Declarations/DeclarationsEvidence.cs

@@ -73,7 +73,7 @@ public DateTime? Expires
         [JsonIgnore]
         public XmlElement XmlSignature { get; set; }
         [XmlIgnore]
-        public Signature Signature { get; set; }
+        public SignatureChoice Signature { get; set; }
 
     }
 }

src/CycloneDX.Core/Models/Declarations/Signatory.cs

@@ -41,6 +41,6 @@ public class Signatory
         [JsonIgnore]
         public XmlElement XmlSignature { get; set; }
         [XmlIgnore]
-        public Signature Signature { get; set; }
+        public SignatureChoice Signature { get; set; }
     }
 }

src/CycloneDX.Core/Models/Declarations/Signature.cs

@@ -31,6 +31,13 @@ public class Signature
         public string Value { get; set; }
     }
 
+    public class SignatureChoice
+    {
+        public List<Signature> Signers;
+        public List<Signature> Chain;
+        public Signature Signature;
+    }
+
     public enum KeyTypeIndicator
     {
         EC,

src/CycloneDX.Core/Models/Definitions/Standard.cs

@@ -72,7 +72,7 @@ public class Standard : IEquatable<Standard>, IHasBomRef
         public System.Xml.XmlAttribute[] AnyAttr { get; set; }
 
         [XmlIgnore]
-        public Signature Signature { get; set; }
+        public SignatureChoice Signature { get; set; }
 
 
 

src/CycloneDX.Core/Models/Service.cs

@@ -210,7 +210,7 @@ public LicenseChoiceList LicensesSerialized
         [XmlAnyElement("Signature", Namespace = "http://www.w3.org/2000/09/xmldsig#")]
         public XmlElement XmlSignature { get; set; }
         [XmlIgnore]
-        public Signature Signature { get; set; }
+        public SignatureChoice Signature { get; set; }
 
         [XmlArray("tags")]
         [XmlArrayItem("tag")]