Moved known values into separate KnownValues package.

Package.swift

@@ -15,14 +15,15 @@ let package = Package(
             targets: ["Envelope"]),
     ],
     dependencies: [
-        .package(url: "https://github.com/BlockchainCommons/BCSwiftSecureComponents.git", from: "8.0.0"),
+        .package(url: "https://github.com/BlockchainCommons/BCSwiftSecureComponents", from: "8.0.0"),
         .package(url: "https://github.com/WolfMcNally/WolfBase", from: "6.0.0"),
-        .package(url: "https://github.com/WolfMcNally/Graph.git", from: "1.0.0"),
-        .package(url: "https://github.com/WolfMcNally/GraphMermaid.git", from: "1.0.0"),
-        .package(url: "https://github.com/WolfMcNally/GraphDot.git", from: "1.0.0"),
-        .package(url: "https://github.com/WolfMcNally/WolfLorem.git", from: "3.0.0"),
-        .package(url: "https://github.com/WolfMcNally/TreeDistance.git", from: "1.0.0"),
+        .package(url: "https://github.com/WolfMcNally/Graph", from: "1.0.0"),
+        .package(url: "https://github.com/WolfMcNally/GraphMermaid", from: "1.0.0"),
+        .package(url: "https://github.com/WolfMcNally/GraphDot", from: "1.0.0"),
+        .package(url: "https://github.com/WolfMcNally/WolfLorem", from: "3.0.0"),
+        .package(url: "https://github.com/WolfMcNally/TreeDistance", from: "1.0.0"),
         .package(url: "https://github.com/apple/swift-docc-plugin", from: "1.0.0"),
+        .package(path: "../BCSwiftKnownValues"),
     ],
     targets: [
         .target(
@@ -32,6 +33,7 @@ let package = Package(
                 "GraphMermaid",
                 "GraphDot",
                 "TreeDistance",
+                .product(name: "KnownValues", package: "BCSwiftKnownValues"),
                 .product(name: "SecureComponents", package: "BCSwiftSecureComponents"),
             ]),
         .testTarget(

Sources/Envelope/Base/Exports.swift

@@ -0,0 +1,4 @@
+// These re-exports are available to anyone who imports this package.
+
+import Foundation
+@_exported import KnownValues

Sources/Envelope/Extensions/KnownValueExensions.swift

@@ -0,0 +1,14 @@
+import Foundation
+import SecureComponents
+
+extension KnownValue: DigestProvider {
+    public var digest: Digest {
+        Digest(taggedCBOR.cborData)
+    }
+}
+
+extension KnownValue: EnvelopeEncodable {
+    public var envelope: Envelope {
+        Envelope(self)
+    }
+}