feat: Add support for pkcs#8 private keys

Sources/CryptorRSA/CryptorRSAKey.swift

@@ -739,20 +739,8 @@ extension CryptorRSA {
 					guard let derData = Data(base64Encoded: derString) else {
 						throw Error(code: ERR_INIT_PK, reason: "Couldn't read PEM String")
 					}
-					let pkcs1PEM: String
-					if keyType == .publicType {
-						let strippedDer = try CryptorRSA.stripX509CertificateHeader(for: derData)
-						pkcs1PEM = CryptorRSA.convertDerToPem(from: strippedDer, type: .publicType)
-					} else {
-						// If data is PKCS8 format strip the header
-						let strippedDer: Data
-						if derData[26] == 0x30 {
-							strippedDer = derData.advanced(by: 26)
-						} else {
-							strippedDer = derData
-						}
-						pkcs1PEM = CryptorRSA.convertDerToPem(from: strippedDer, type: .privateType)
-					}
+					let strippedDer = try CryptorRSA.stripX509CertificateHeader(for: derData)
+					let pkcs1PEM = CryptorRSA.convertDerToPem(from: strippedDer, type: keyType)
 					return pkcs1PEM
 				}
 			}

Sources/CryptorRSA/CryptorRSAUtilities.swift

@@ -224,6 +224,11 @@ public extension CryptorRSA {
 	///
 	static func stripX509CertificateHeader(for keyData: Data) throws -> Data {
 
+		// If private key in pkcs8 format, strip the header
+		if keyData[26] == 0x30 {
+			return(keyData.advanced(by: 26))
+		}
+
 		let count = keyData.count / MemoryLayout<CUnsignedChar>.size
 
 		guard count > 0 else {

Tests/CryptorRSATests/CryptorRSATests.swift

@@ -296,6 +296,17 @@ class CryptorRSATests: XCTestCase {
         }
 	}
 
+	func test_private_initWithPKCS8() throws {
+
+		let path = URL(fileURLWithPath: #file).appendingPathComponent("../keys/pkcs8.pem").standardized
+		XCTAssertNotNil(path)
+
+		let str = try String(contentsOf: path, encoding: .utf8)
+		let privateKey = try? CryptorRSA.createPrivateKey(withPEM: str)
+		XCTAssertNotNil(privateKey)
+		XCTAssertTrue(privateKey?.type == .privateType)
+	}
+
 	func test_private_initWithPEMName() throws {
 
 		if CryptorRSATests.useBundles, let bundle = CryptorRSATests.bundle {

Tests/CryptorRSATests/keys/pkcs8.pem

@@ -0,0 +1,16 @@
+-----BEGIN PRIVATE KEY-----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+-----END PRIVATE KEY-----