diff --git a/swift/ql/test/query-tests/Security/CWE-327/BrokenCryptoAlgorithm.expected b/swift/ql/test/query-tests/Security/CWE-327/BrokenCryptoAlgorithm.expected
new file mode 100644
index 000000000000..e69de29bb2d1
diff --git a/swift/ql/test/query-tests/Security/CWE-327/BrokenCryptoAlgorithm.qlref.disabled b/swift/ql/test/query-tests/Security/CWE-327/BrokenCryptoAlgorithm.qlref.disabled
new file mode 100644
index 000000000000..af059fc9e2b8
--- /dev/null
+++ b/swift/ql/test/query-tests/Security/CWE-327/BrokenCryptoAlgorithm.qlref.disabled
@@ -0,0 +1 @@
+queries/Security/CWE-327/BrokenCryptoAlgorithm.ql
\ No newline at end of file
diff --git a/swift/ql/test/query-tests/Security/CWE-327/test_commoncrypto.swift b/swift/ql/test/query-tests/Security/CWE-327/test_commoncrypto.swift
new file mode 100644
index 000000000000..df32d3e477c4
--- /dev/null
+++ b/swift/ql/test/query-tests/Security/CWE-327/test_commoncrypto.swift
@@ -0,0 +1,217 @@
+// --- stubs ---
+
+struct Data {
+	func withUnsafeBytes<ResultType>(
+		_ body: (UnsafeRawBufferPointer) throws -> ResultType
+		) rethrows -> ResultType { return 0 as! ResultType }
+	mutating func withUnsafeMutableBytes<ResultType>(
+		_ body: (UnsafeMutableRawBufferPointer) throws -> ResultType
+		) rethrows -> ResultType { return 0 as! ResultType }
+}
+
+// --- CommonCryptor ---
+// (real world projects will import the CommonCryptor headers which get
+//  converted to Swift by the compiler; the following is an approximation
+//  of that derived from QL queries and the CommonCryptor header files)
+
+var kCCSuccess : Int = 0
+typealias CCCryptorStatus = Int32
+
+typealias CCCryptorRef = OpaquePointer
+
+var kCCEncrypt : Int = 0
+var kCCDecrypt : Int = 1
+typealias CCOperation = UInt32
+
+var kCCAlgorithmAES128 : Int = 0
+var kCCAlgorithmAES : Int = 0
+var kCCAlgorithmDES : Int = 1
+var kCCAlgorithm3DES : Int = 2
+var kCCAlgorithmCAST : Int = 3
+var kCCAlgorithmRC4 : Int = 4
+var kCCAlgorithmRC2 : Int = 5
+var kCCAlgorithmBlowfish : Int = 6
+typealias CCAlgorithm = UInt32
+
+var kCCOptionPKCS7Padding : Int = 1
+var kCCOptionECBMode : Int = 2
+typealias CCOptions = UInt32
+
+var kCCModeECB : Int = 1
+var kCCModeCBC : Int = 2
+var kCCModeCFB : Int = 3
+var kCCModeCTR : Int = 4
+var kCCModeOFB : Int = 7
+var kCCModeRC4 : Int = 9
+var kCCModeCFB8 : Int = 10
+typealias CCMode = UInt32
+
+typealias CCPadding = UInt32
+
+typealias CCModeOptions = UInt32
+
+func CCCryptorCreate(
+	_ op: CCOperation,
+	_ alg: CCAlgorithm,
+	_ options: CCOptions,
+	_ key: UnsafeRawPointer?,
+	_ keyLength: Int,
+	_ iv: UnsafeRawPointer?,
+	_ cryptorRef: UnsafeMutablePointer<CCCryptorRef?>?
+	) -> CCCryptorStatus { return 0 }
+
+func CCCryptorCreateFromData(
+	_ op: CCOperation,
+	_ alg: CCAlgorithm,
+	_ options: CCOptions,
+	_ key: UnsafeRawPointer?,
+	_ keyLength: Int,
+	_ iv: UnsafeRawPointer?,
+	_ data: UnsafeRawPointer?,
+	_ dataLength: Int,
+	_ cryptorRef: UnsafeMutablePointer<CCCryptorRef?>?,
+	_ dataUsed: UnsafeMutablePointer<Int>?
+	) -> CCCryptorStatus { return 0 }
+
+func CCCryptorCreateWithMode(
+	_ op: CCOperation,
+	_ mode: CCMode,
+	_ alg: CCAlgorithm,
+	_ padding: CCPadding,
+	_ iv: UnsafeRawPointer?,
+	_ key: UnsafeRawPointer?,
+	_ keyLength: Int,
+	_ tweak: UnsafeRawPointer?,
+	_ tweakLength: Int,
+	_ numRounds: Int32,
+	_ options: CCModeOptions,
+	_ cryptorRef: UnsafeMutablePointer<CCCryptorRef?>?
+	) -> CCCryptorStatus { return 0 }
+
+func CCCryptorUpdate(
+	_ cryptorRef: CCCryptorRef?,
+	_ dataIn: UnsafeRawPointer?,
+	_ dataInLength: Int,
+	_ dataOut: UnsafeMutableRawPointer?,
+	_ dataOutAvailable: Int,
+	_ dataOutMoved: UnsafeMutablePointer<Int>?
+	) -> CCCryptorStatus { return 0 }
+
+func CCCryptorFinal(
+	_ cryptorRef: CCCryptorRef?,
+	_ dataOut: UnsafeMutableRawPointer?,
+	_ dataOutAvailable: Int,
+	_ dataOutMoved: UnsafeMutablePointer<Int>?
+	) -> CCCryptorStatus { return 0 }
+
+func CCCrypt(
+	_ op: CCOperation,
+	_ alg: CCAlgorithm,
+	_ options: CCOptions,
+	_ key: UnsafeRawPointer?,
+	_ keyLength: Int,
+	_ iv: UnsafeRawPointer?,
+	_ dataIn: UnsafeRawPointer?,
+	_ dataInLength: Int,
+	_ dataOut: UnsafeMutableRawPointer?,
+	_ dataOutAvailable: Int,
+	_ dataOutMoved: UnsafeMutablePointer<Int>?
+	) -> CCCryptorStatus { return 0 }
+
+// --- tests ---
+
+func cond() -> Bool { return true }
+
+func test_commoncrypto1(key: Data, iv: Data, dataIn: Data, dataOut: inout Data) {
+	// semi-realistic test case
+	var myCryptor: CCCryptorRef?
+	var dataOutWritten = 0
+
+	/*key.withUnsafeBytes({
+		keyPtr in
+		iv.withUnsafeBytes({
+			// create the cryptor object
+			ivPtr in
+			let result1 = CCCryptorCreate(
+				CCOperation(kCCEncrypt),
+				CCAlgorithm(kCCAlgorithm3DES), // BAD [NOT DETECTED]
+				CCOptions(0),
+				keyPtr.baseAddress!,
+				keyPtr.count,
+				ivPtr.baseAddress!,
+				&myCryptor
+			)
+			guard result1 == CCCryptorStatus(kCCSuccess) else {
+				return // fail
+			}
+
+			dataIn.withUnsafeBytes({
+				dataInPtr in
+				dataOut.withUnsafeMutableBytes({
+					dataOutPtr in
+					// encrypt data
+					while (cond()) {
+						let result2 = CCCryptorUpdate(
+							myCryptor,
+							dataInPtr.baseAddress!,
+							dataInPtr.count,
+							dataOutPtr.baseAddress!,
+							dataOutPtr.count,
+							&dataOutWritten)
+						guard result2 == CCCryptorStatus(kCCSuccess) else {
+							return // fail
+						}
+					}
+
+					// finish
+					let result3 = CCCryptorFinal(
+						myCryptor,
+						dataOutPtr.baseAddress!,
+						dataOutPtr.count,
+						&dataOutWritten)
+					guard result3 == CCCryptorStatus(kCCSuccess) else {
+						return // fail
+					}
+				})
+			})
+		})
+	})*/
+}
+
+func test_commoncrypto2(
+	key: UnsafeRawPointer, keyLen: Int,
+	iv: UnsafeRawPointer,
+	dataIn: UnsafeRawPointer, dataInLen: Int,
+	dataOut: UnsafeMutableRawPointer, dataOutAvail: Int) {
+	var myCryptor: CCCryptorRef?
+	var dataOutWritten = 0
+
+	// algorithms
+	_ = CCCrypt(CCOperation(kCCEncrypt), CCAlgorithm(kCCAlgorithmAES128), 0, key, keyLen, iv, dataIn, dataInLen, dataOut, dataOutAvail, nil)
+	_ = CCCrypt(CCOperation(kCCEncrypt), CCAlgorithm(kCCAlgorithmAES), 0, key, keyLen, iv, dataIn, dataInLen, dataOut, dataOutAvail, nil)
+	_ = CCCrypt(CCOperation(kCCEncrypt), CCAlgorithm(kCCAlgorithmDES), 0, key, keyLen, iv, dataIn, dataInLen, dataOut, dataOutAvail, nil) // BAD [NOT DETECTED]
+	_ = CCCrypt(CCOperation(kCCEncrypt), CCAlgorithm(kCCAlgorithm3DES), 0, key, keyLen, iv, dataIn, dataInLen, dataOut, dataOutAvail, nil) // BAD [NOT DETECTED]
+	_ = CCCrypt(CCOperation(kCCEncrypt), CCAlgorithm(kCCAlgorithmCAST), 0, key, keyLen, iv, dataIn, dataInLen, dataOut, dataOutAvail, nil)
+	_ = CCCrypt(CCOperation(kCCEncrypt), CCAlgorithm(kCCAlgorithmRC4), 0, key, keyLen, iv, dataIn, dataInLen, dataOut, dataOutAvail, nil) // BAD [NOT DETECTED]
+	_ = CCCrypt(CCOperation(kCCEncrypt), CCAlgorithm(kCCAlgorithmRC2), 0, key, keyLen, iv, dataIn, dataInLen, dataOut, dataOutAvail, nil) // BAD [NOT DETECTED]
+	_ = CCCrypt(CCOperation(kCCEncrypt), CCAlgorithm(kCCAlgorithmBlowfish), 0, key, keyLen, iv, dataIn, dataInLen, dataOut, dataOutAvail, nil)
+	_ = CCCryptorCreate(CCOperation(kCCEncrypt), CCAlgorithm(kCCAlgorithm3DES), 0, key, keyLen, iv, &myCryptor) // BAD [NOT DETECTED]
+	_ = CCCryptorCreateFromData(CCOperation(kCCEncrypt), CCAlgorithm(kCCAlgorithm3DES), 0, key, keyLen, iv, dataIn, dataInLen, &myCryptor, &dataOutWritten) // BAD [NOT DETECTED]
+	_ = CCCryptorCreateFromData(CCOperation(kCCDecrypt), CCAlgorithm(kCCAlgorithm3DES), 0, key, keyLen, iv, dataIn, dataInLen, &myCryptor, &dataOutWritten) // BAD [NOT DETECTED]
+
+	// block modes (the default is CBC)
+	_ = CCCrypt(CCOperation(kCCEncrypt), CCAlgorithm(kCCAlgorithmAES), CCOptions(0), key, keyLen, iv, dataIn, dataInLen, dataOut, dataOutAvail, nil)
+	_ = CCCrypt(CCOperation(kCCEncrypt), CCAlgorithm(kCCAlgorithmAES), CCOptions(kCCOptionPKCS7Padding), key, keyLen, iv, dataIn, dataInLen, dataOut, dataOutAvail, nil)
+	_ = CCCrypt(CCOperation(kCCEncrypt), CCAlgorithm(kCCAlgorithmAES), CCOptions(kCCOptionECBMode), key, keyLen, iv, dataIn, dataInLen, dataOut, dataOutAvail, nil) // BAD [NOT DETECTED]
+	_ = CCCryptorCreate(CCOperation(kCCEncrypt), CCAlgorithm(kCCAlgorithm3DES), CCOptions(kCCOptionECBMode), key, keyLen, iv, &myCryptor) // BAD [NOT DETECTED]
+	_ = CCCryptorCreateFromData(CCOperation(kCCEncrypt), CCAlgorithm(kCCAlgorithm3DES), CCOptions(kCCOptionECBMode), key, keyLen, iv, dataIn, dataInLen, &myCryptor, &dataOutWritten) // BAD [NOT DETECTED]
+
+	// modes
+	_ = CCCryptorCreateWithMode(CCOperation(kCCAlgorithmAES), CCMode(kCCModeECB), CCAlgorithm(kCCAlgorithm3DES), CCPadding(0), iv, key, keyLen, nil, 0, 0, CCModeOptions(0), &myCryptor) // BAD [NOT DETECTED]
+	_ = CCCryptorCreateWithMode(CCOperation(kCCAlgorithmAES), CCMode(kCCModeCBC), CCAlgorithm(kCCAlgorithm3DES), CCPadding(0), iv, key, keyLen, nil, 0, 0, CCModeOptions(0), &myCryptor)
+	_ = CCCryptorCreateWithMode(CCOperation(kCCAlgorithmAES), CCMode(kCCModeCFB), CCAlgorithm(kCCAlgorithm3DES), CCPadding(0), iv, key, keyLen, nil, 0, 0, CCModeOptions(0), &myCryptor)
+	_ = CCCryptorCreateWithMode(CCOperation(kCCAlgorithmAES), CCMode(kCCModeCTR), CCAlgorithm(kCCAlgorithm3DES), CCPadding(0), iv, key, keyLen, nil, 0, 0, CCModeOptions(0), &myCryptor)
+	_ = CCCryptorCreateWithMode(CCOperation(kCCAlgorithmAES), CCMode(kCCModeOFB), CCAlgorithm(kCCAlgorithm3DES), CCPadding(0), iv, key, keyLen, nil, 0, 0, CCModeOptions(0), &myCryptor)
+	_ = CCCryptorCreateWithMode(CCOperation(kCCAlgorithmAES), CCMode(kCCModeRC4), CCAlgorithm(kCCAlgorithm3DES), CCPadding(0), iv, key, keyLen, nil, 0, 0, CCModeOptions(0), &myCryptor)
+	_ = CCCryptorCreateWithMode(CCOperation(kCCAlgorithmAES), CCMode(kCCModeCFB8), CCAlgorithm(kCCAlgorithm3DES), CCPadding(0), iv, key, keyLen, nil, 0, 0, CCModeOptions(0), &myCryptor)
+}