UInt256 type for Swift (#561)

Initial UInt256 type for Swift

Author: csjones

.github/workflows/xcframework-release.yml

@@ -96,7 +96,14 @@ jobs:
                   -e 's/[[:<:]]P256K\.HashDigest[[:>:]]/HashDigest/g' \
                   -e 's/[[:<:]]P256K\.SharedSecret[[:>:]]/SharedSecret/g' \
                   -e 's/[[:<:]]P256K\.PublicKeyImplementation[[:>:]]/PublicKeyImplementation/g' \
-                  -e 's/[[:<:]]P256K\.PrivateKeyImplementation[[:>:]]/PrivateKeyImplementation/g'
+                  -e 's/[[:<:]]P256K\.PrivateKeyImplementation[[:>:]]/PrivateKeyImplementation/g' \
+                  -e 's/[[:<:]]P256K\.UInt256[[:>:]]/UInt256/g' \
+                  -e 's/[[:<:]]P256K\.Int256[[:>:]]/Int256/g' \
+                  -e 's/[[:<:]]P256K\.UInt128[[:>:]]/UInt128/g' \
+                  -e 's/[[:<:]]P256K\.Int128[[:>:]]/Int128/g' \
+                  -e 's/[[:<:]]P256K\.SIMDWordsInteger[[:>:]]/SIMDWordsInteger/g' \
+                  -e 's/[[:<:]]P256K\.SIMDWrapper[[:>:]]/SIMDWrapper/g' \
+                  -e 's/[[:<:]]P256K\.Vector[[:>:]]/Vector/g'
       - name: 7z XCFramework
         run: |
           # Copy COPYING file to current directory to avoid including folder structure

Projects/Sources/P256K/UInt256.swift

@@ -0,0 +1 @@
+../../../Sources/ZKP/UInt256.swift

Sources/P256K/UInt256.swift

@@ -0,0 +1 @@
+../ZKP/UInt256.swift

Sources/ZKP/Asymmetric.swift

@@ -108,6 +108,15 @@ public extension P256K {
                 }
             }
 
+            /// Creates a secp256k1 private key for signing from a data representation.
+            ///
+            /// - Parameter data: A raw representation of the key.
+            /// - Parameter format: The key format, default is .compressed.
+            /// - Throws: An error if the raw representation does not create a private key for signing.
+            @available(macOS 13.3, *) public init(_ staticInt: UInt256, format: P256K.Format = .compressed) throws {
+                self.baseKey = try PrivateKeyImplementation(dataRepresentation: staticInt.rawValue, format: format)
+            }
+
             /// Determines if two private keys are equal.
             ///
             /// - Parameters: