diff --git a/Package.swift b/Package.swift
index 69432d4..9dee966 100644
--- a/Package.swift
+++ b/Package.swift
@@ -22,6 +22,5 @@ let package = Package(
                 .product(name: "SwiftECC", package: "SwiftECC")
             ]
         )
-    ],
-    swiftLanguageModes: [.v5]
+    ]
 )
diff --git a/Sources/nfclib/CardActions/CardCommands.swift b/Sources/nfclib/CardActions/CardCommands.swift
index 7308f03..ee7baff 100644
--- a/Sources/nfclib/CardActions/CardCommands.swift
+++ b/Sources/nfclib/CardActions/CardCommands.swift
@@ -125,7 +125,7 @@ public protocol CardCommands: Sendable {
      * - Throws: An error if the operation fails.
      * - Returns: The authentication response as `Data`.
      */
-    func authenticate(for hash: Data, withPin1 pin1: SecureData) async throws -> Data
+    func authenticate(for hash: any DataType, withPin1 pin1: SecureData) async throws -> Data
 
     /**
      * Calculates a digital signature for the given hash.
@@ -136,7 +136,7 @@ public protocol CardCommands: Sendable {
      * - Throws: An error if the operation fails.
      * - Returns: The signature as `Data`.
      */
-    func calculateSignature(for hash: Data, withPin2 pin2: SecureData) async throws -> Data
+    func calculateSignature(for hash: any DataType, withPin2 pin2: SecureData) async throws -> Data
 
     /**
      * Decrypts data using PIN 1.
@@ -147,5 +147,5 @@ public protocol CardCommands: Sendable {
      * - Throws: An error if the operation fails.
      * - Returns: The decrypted data.
      */
-    func decryptData(_ hash: Data, withPin1 pin1: SecureData) async throws -> Data
+    func decryptData(_ hash: any DataType, withPin1 pin1: SecureData) async throws -> Data
 }
diff --git a/Sources/nfclib/CardActions/CardReader.swift b/Sources/nfclib/CardActions/CardReader.swift
index f7ca6ff..7a660d4 100644
--- a/Sources/nfclib/CardActions/CardReader.swift
+++ b/Sources/nfclib/CardActions/CardReader.swift
@@ -3,8 +3,6 @@
 
 import Foundation
 
-typealias Bytes = [UInt8]
-
 protocol CardReader: Sendable {
     /**
      * Sends an APDU (Application Protocol Data Unit) command to the smart card and retrieves the response.
diff --git a/Sources/nfclib/CardActions/CardReaderNFC.swift b/Sources/nfclib/CardActions/CardReaderNFC.swift
index 50a81f6..65eb6ba 100644
--- a/Sources/nfclib/CardActions/CardReaderNFC.swift
+++ b/Sources/nfclib/CardActions/CardReaderNFC.swift
@@ -3,7 +3,6 @@
 
 import OSLog
 import CoreNFC
-import CommonCrypto
 import CryptoTokenKit
 internal import SwiftECC
 internal import BigInt
@@ -308,8 +307,8 @@ class CardReaderNFC: CardReader {
     // MARK: - Utils
     // swiftlint:disable force_unwrapping
     static private func pseudoRandomNumberMappingAES(
-        sVal: any AES.DataType,
-        tVal: any AES.DataType,
+        sVal: any DataType,
+        tVal: any DataType,
         domain: Domain
     ) throws -> BInt {
         let lVal = sVal.count * 8
@@ -383,7 +382,7 @@ class CardReaderNFC: CardReader {
             Point(x3Val, (AVal * UVal).mod(pVal))
     }
 
-    static private func decryptNonce<T: AES.DataType>(CAN: String, encryptedNonce: T) throws -> Bytes {
+    static private func decryptNonce<T: DataType>(CAN: String, encryptedNonce: T) throws -> Bytes {
         let decryptionKey = KDF(key: Bytes(CAN.utf8), counter: 3)
         let cipher = AES.CBC(key: decryptionKey)
         return try cipher.decrypt(encryptedNonce)
@@ -392,14 +391,7 @@ class CardReaderNFC: CardReader {
     static private func KDF(key: Bytes, counter: UInt8) -> Bytes {
         var keydata = key + Bytes(repeating: 0x00, count: 4)
         keydata[keydata.count - 1] = counter
-        return SHA256(data: keydata)
-    }
-
-    static private func SHA256(data: Bytes) -> Bytes {
-        Bytes(unsafeUninitializedCapacity: Int(CC_SHA256_DIGEST_LENGTH)) { buffer, initializedCount in
-            CC_SHA256(data, CC_LONG(data.count), buffer.baseAddress)
-            initializedCount = Int(CC_SHA256_DIGEST_LENGTH)
-        }
+        return sha(hashLength: .bits256, data: keydata)
     }
 
     static private func random(count: Int) throws -> Data {
diff --git a/Sources/nfclib/CardActions/Idemia.swift b/Sources/nfclib/CardActions/Idemia.swift
index 89c1c06..6613459 100644
--- a/Sources/nfclib/CardActions/Idemia.swift
+++ b/Sources/nfclib/CardActions/Idemia.swift
@@ -132,25 +132,25 @@ final class Idemia: CardCommandsInternal {
 
     // MARK: - Authentication & Signing
 
-    func authenticate(for hash: Data, withPin1 pin1: SecureData) async throws -> Data {
+    func authenticate(for hash: any DataType, withPin1 pin1: SecureData) async throws -> Data {
         _ = try await select(file: kAIDOberthur)
         try await verifyCode(.pin1, code: pin1)
         try await setSecEnv(mode: 0xA4, algo: [0xFF, 0x20, 0x08, 0x00], keyRef: AUTHKEY)
         var paddedHash = Data(repeating: 0x00, count: max(48, hash.count) - hash.count)
-        paddedHash.append(hash)
+        paddedHash.append(contentsOf: hash)
         return try await reader.sendAPDU(ins: 0x88, data: paddedHash, leByte: 0x00)
     }
 
-    func calculateSignature(for hash: Data, withPin2 pin2: SecureData) async throws -> Data {
+    func calculateSignature(for hash: any DataType, withPin2 pin2: SecureData) async throws -> Data {
         _ = try await select(file: kAIDQSCD)
         try await verifyCode(.pin2, code: pin2)
         try await setSecEnv(mode: 0xB6, algo: [0xFF, 0x15, 0x08, 0x00], keyRef: SIGNKEY)
         var paddedHash = Data(repeating: 0x00, count: max(48, hash.count) - hash.count)
-        paddedHash.append(hash)
+        paddedHash.append(contentsOf: hash)
         return try await reader.sendAPDU(ins: 0x2A, p1Byte: 0x9E, p2Byte: 0x9A, data: paddedHash, leByte: 0x00)
     }
 
-    func decryptData(_ hash: Data, withPin1 pin1: SecureData) async throws -> Data {
+    func decryptData(_ hash: any DataType, withPin1 pin1: SecureData) async throws -> Data {
         _ = try await select(file: kAIDOberthur)
         try await verifyCode(.pin1, code: pin1)
         try await setSecEnv(mode: 0xB8, algo: [0xFF, 0x30, 0x04, 0x00], keyRef: AUTHKEY)
diff --git a/Sources/nfclib/CardActions/Thales.swift b/Sources/nfclib/CardActions/Thales.swift
index 08675a1..0e01e39 100644
--- a/Sources/nfclib/CardActions/Thales.swift
+++ b/Sources/nfclib/CardActions/Thales.swift
@@ -129,7 +129,7 @@ final class Thales: CardCommandsInternal {
 
     // MARK: - Authentication & Signing
 
-    private func sign(type: CodeType, pin: SecureData, keyRef: UInt8, hash: Data) async throws -> Data {
+    private func sign(type: CodeType, pin: SecureData, keyRef: UInt8, hash: any DataType) async throws -> Data {
         try await verifyCode(type, code: pin)
         try await setSecEnv(mode: 0xB6, algo: [0x24 + UInt8(hash.count)], keyRef: keyRef)
         _ = try await reader
@@ -147,12 +147,12 @@ final class Thales: CardCommandsInternal {
         return try await reader.sendAPDU(ins: 0x2A, p1Byte: 0x9E, p2Byte: 0x9A, leByte: 0x00)
     }
 
-    func authenticate(for hash: Data, withPin1 pin1: SecureData) async throws -> Data {
+    func authenticate(for hash: any DataType, withPin1 pin1: SecureData) async throws -> Data {
         _ = try await select(file: Thales.kAID)
         return try await sign(type: .pin1, pin: pin1, keyRef: Thales.AUTHKEY, hash: hash)
     }
 
-    func calculateSignature(for hash: Data, withPin2 pin2: SecureData) async throws -> Data {
+    func calculateSignature(for hash: any DataType, withPin2 pin2: SecureData) async throws -> Data {
         let (_, pin2Changed) = try await readCodeTryCounterRecord(.pin2)
         guard pin2Changed else { throw IdCardInternalError.notActivated }
 
@@ -160,7 +160,7 @@ final class Thales: CardCommandsInternal {
         return try await sign(type: .pin2, pin: pin2, keyRef: Thales.SIGNKEY, hash: hash)
     }
 
-    func decryptData(_ hash: Data, withPin1 pin1: SecureData) async throws -> Data {
+    func decryptData(_ hash: any DataType, withPin1 pin1: SecureData) async throws -> Data {
         _ = try await select(file: Thales.kAID)
         try await verifyCode(.pin1, code: pin1)
         try await setSecEnv(mode: 0xB8, keyRef: Thales.AUTHKEY)
diff --git a/Sources/nfclib/Utilities/AES.swift b/Sources/nfclib/Utilities/AES.swift
index f7bd417..c10bd1b 100644
--- a/Sources/nfclib/Utilities/AES.swift
+++ b/Sources/nfclib/Utilities/AES.swift
@@ -5,7 +5,6 @@ import CommonCrypto
 import Foundation
 
 class AES {
-    typealias DataType = DataProtocol & ContiguousBytes
     static let BlockSize: Int = kCCBlockSizeAES128
     static let Zero = Bytes(repeating: 0x00, count: BlockSize)
 
diff --git a/Sources/nfclib/Utilities/SHA.swift b/Sources/nfclib/Utilities/SHA.swift
new file mode 100644
index 0000000..ca382c2
--- /dev/null
+++ b/Sources/nfclib/Utilities/SHA.swift
@@ -0,0 +1,29 @@
+// SPDX-FileCopyrightText: Estonian Information System Authority
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
+import Foundation
+import CommonCrypto
+
+enum HashLength {
+    case bits256
+    case bits384
+    case bits512
+}
+
+func sha(hashLength: HashLength, data: some DataType) -> Bytes {
+    let (digestLength, hashFunction) = switch hashLength {
+    case .bits256:
+        (Int(CC_SHA256_DIGEST_LENGTH), CC_SHA256)
+    case .bits384:
+        (Int(CC_SHA384_DIGEST_LENGTH), CC_SHA384)
+    case .bits512:
+        (Int(CC_SHA512_DIGEST_LENGTH), CC_SHA512)
+    }
+
+    return Bytes(unsafeUninitializedCapacity: digestLength) { buffer, initializedCount in
+        data.withUnsafeBytes { dataBytes in
+            _ = hashFunction(dataBytes.baseAddress, CC_LONG(dataBytes.count), buffer.baseAddress)
+        }
+        initializedCount = digestLength
+    }
+}
diff --git a/Sources/nfclib/Utilities/Types.swift b/Sources/nfclib/Utilities/Types.swift
new file mode 100644
index 0000000..6100c18
--- /dev/null
+++ b/Sources/nfclib/Utilities/Types.swift
@@ -0,0 +1,8 @@
+// SPDX-FileCopyrightText: Estonian Information System Authority
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
+import Foundation
+
+typealias Bytes = [UInt8]
+
+public typealias DataType = DataProtocol & ContiguousBytes
diff --git a/Sources/nfclib/Utilities/Utilities.swift b/Sources/nfclib/Utilities/Utilities.swift
index 76f518d..3470e8f 100644
--- a/Sources/nfclib/Utilities/Utilities.swift
+++ b/Sources/nfclib/Utilities/Utilities.swift
@@ -4,10 +4,6 @@
 import Foundation
 import Security
 
-public let rsaAlgorithmName = "RSA"
-public let ecAlgorithmName = "EC"
-public let unknownAlgorithmName = "Unknown"
-
 func convertBytesToX509Certificate(_ data: Data) throws -> SecCertificate {
     guard let certificate = SecCertificateCreateWithData(nil, data as CFData) else {
         throw CertificateConversionError.creationFailed
diff --git a/Sources/nfclib/WebEID/OperationAuthenticateWithWebEID.swift b/Sources/nfclib/WebEID/OperationAuthenticateWithWebEID.swift
index 1b63344..2dc1f79 100644
--- a/Sources/nfclib/WebEID/OperationAuthenticateWithWebEID.swift
+++ b/Sources/nfclib/WebEID/OperationAuthenticateWithWebEID.swift
@@ -8,7 +8,6 @@ import Security
 public enum AuthenticateWithWebEidError: Error {
     case failedToReadPublicKey
     case failedToDetermineAlgorithm
-    case failedToHashData
     case failedToMapAlgorithm
     case failedCertificateExpired
     case failedCertificateNotYetValid
@@ -113,25 +112,12 @@ extension OperationAuthenticateWithWebEID: @MainActor NFCTagReaderSessionDelegat
                     return
                 }
 
-                guard let keyAlgorithmData = getAlgorithmNameTypeAndLength(from: publicKey) else {
-                    let errorMessage = "Failed to read data"
-                    finish(.failure(AuthenticateWithWebEidError.failedToDetermineAlgorithm))
-                    session.invalidate(errorMessage: errorMessage)
-                    return
-                }
+                let algorithm = try WebEidSignatureAlgorithm.forAuthenticationKey(publicKey)
+                let hashLength = algorithm.hashLength
 
-                guard let hashLength = hashLengthFromInt(keyAlgorithmData.keyLength),
-                      let originData = origin.data(using: .utf8),
-                      let challengeData = challenge.data(using: .utf8),
-                      let originHash = sha(hashLength: hashLength, data: originData),
-                      let challengeHash = sha(hashLength: hashLength, data: challengeData),
-                      let webEidHash = sha(hashLength: hashLength, data: originHash + challengeHash)
-                else {
-                    let errorMessage = "Failed to read data"
-                    finish(.failure(AuthenticateWithWebEidError.failedToHashData))
-                    session.invalidate(errorMessage: errorMessage)
-                    return
-                }
+                let originHash = sha(hashLength: hashLength, data: Bytes(origin.utf8))
+                let challengeHash = sha(hashLength: hashLength, data: Bytes(challenge.utf8))
+                let webEidHash = sha(hashLength: hashLength, data: originHash + challengeHash)
 
                 updateAlertMessage(step: 4)
                 guard let pin1 else { throw IdCardInternalError.pinVerificationFailed(codeType: .pin1) }
@@ -140,7 +126,7 @@ extension OperationAuthenticateWithWebEID: @MainActor NFCTagReaderSessionDelegat
 
                 let webEidData = WebEidData(
                     unverifiedCertificate: certBytes.base64EncodedString(),
-                    algorithm: keyAlgorithmData.algorithm,
+                    algorithm: algorithm,
                     signature: authResult.base64EncodedString(),
                     signingCertificate: signingCertificateBytes.base64EncodedString()
                 )
@@ -154,32 +140,6 @@ extension OperationAuthenticateWithWebEID: @MainActor NFCTagReaderSessionDelegat
         }
     }
 
-    public func getAlgorithmNameTypeAndLength(from key: SecKey) -> (algorithm: String, keyLength: Int)? {
-        // Get the algorithm type from the key
-        if let algorithmAttributes = SecKeyCopyAttributes(key) as? [String: Any], let algorithmType =
-            algorithmAttributes[kSecAttrKeyType as String] as? String {
-
-            // Get the algorithm name based on the type
-            var algorithmName = ""
-            var keyLength = 0
-
-            switch algorithmType {
-            case String(kSecAttrKeyTypeRSA):
-                algorithmName = rsaAlgorithmName
-                keyLength = (algorithmAttributes[kSecAttrKeySizeInBits as String] as? Int) ?? 0
-            case String(kSecAttrKeyTypeEC):
-                algorithmName = ecAlgorithmName
-                keyLength = (algorithmAttributes[kSecAttrKeySizeInBits as String] as? Int) ?? 0
-            default:
-                algorithmName = unknownAlgorithmName
-            }
-
-            return (algorithm: algorithmName, keyLength: keyLength)
-        } else {
-            return nil
-        }
-    }
-
     public func tagReaderSessionDidBecomeActive(_: NFCTagReaderSession) { }
 
     public func tagReaderSession(_ session: NFCTagReaderSession, didInvalidateWithError error: Error) {
@@ -187,5 +147,4 @@ extension OperationAuthenticateWithWebEID: @MainActor NFCTagReaderSessionDelegat
         self.session = nil
         finish(.failure(IdCardInternalError.mapSessionInvalidation(error)))
     }
-
 }
diff --git a/Sources/nfclib/WebEID/WebEIDHash.swift b/Sources/nfclib/WebEID/WebEIDHash.swift
deleted file mode 100644
index 0265387..0000000
--- a/Sources/nfclib/WebEID/WebEIDHash.swift
+++ /dev/null
@@ -1,41 +0,0 @@
-// SPDX-FileCopyrightText: Estonian Information System Authority
-// SPDX-License-Identifier: LGPL-2.1-or-later
-
-import Foundation
-import CommonCrypto
-
-enum HashLength: Int {
-    case bits256 = 256
-    case bits384 = 384
-    case bits512 = 512
-}
-
-func hashLengthFromInt(_ intValue: Int) -> HashLength? {
-    return HashLength(rawValue: intValue)
-}
-
-func sha(hashLength: HashLength, data: Data) -> Data? {
-    let digestLength: Int
-    let hashFunction: (UnsafeRawPointer?, CC_LONG, UnsafeMutablePointer<UInt8>?) -> UnsafeMutablePointer<UInt8>?
-
-    switch hashLength {
-    case .bits256:
-        digestLength = Int(CC_SHA256_DIGEST_LENGTH)
-        hashFunction = CC_SHA256
-    case .bits384:
-        digestLength = Int(CC_SHA384_DIGEST_LENGTH)
-        hashFunction = CC_SHA384
-    case .bits512:
-        digestLength = Int(CC_SHA512_DIGEST_LENGTH)
-        hashFunction = CC_SHA512
-    }
-
-    let hashBytes = Bytes(unsafeUninitializedCapacity: digestLength) { buffer, initializedCount in
-        data.withUnsafeBytes { dataBytes in
-            _ = hashFunction(dataBytes.baseAddress, CC_LONG(data.count), buffer.baseAddress)
-        }
-        initializedCount = digestLength
-    }
-
-    return Data(hashBytes)
-}
diff --git a/Sources/nfclib/WebEID/WebEidData.swift b/Sources/nfclib/WebEID/WebEidData.swift
index c992cc9..221f4bc 100644
--- a/Sources/nfclib/WebEID/WebEidData.swift
+++ b/Sources/nfclib/WebEID/WebEidData.swift
@@ -6,11 +6,11 @@ import Foundation
 public final class WebEidData: Sendable {
     public let unverifiedCertificate: String
     public let signingCertificate: String
-    public let algorithm: String
+    public let algorithm: WebEidSignatureAlgorithm
     public let signature: String
 
     init(unverifiedCertificate: String,
-         algorithm: String,
+         algorithm: WebEidSignatureAlgorithm,
          signature: String,
          signingCertificate: String) {
         self.unverifiedCertificate = unverifiedCertificate
@@ -24,7 +24,7 @@ public final class WebEidData: Sendable {
         ====
         unverifiedCertificate: \(unverifiedCertificate)
         ====
-        algorithm: \(algorithm)
+        algorithm: \(algorithm.rawValue)
         ====
         signature: \(signature)
         ====
diff --git a/Sources/nfclib/WebEID/WebEidSignatureAlgorithm.swift b/Sources/nfclib/WebEID/WebEidSignatureAlgorithm.swift
new file mode 100644
index 0000000..a71590f
--- /dev/null
+++ b/Sources/nfclib/WebEID/WebEidSignatureAlgorithm.swift
@@ -0,0 +1,37 @@
+// SPDX-FileCopyrightText: Estonian Information System Authority
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
+import Foundation
+import Security
+
+public enum WebEidSignatureAlgorithm: String, Sendable {
+    case es256 = "ES256"
+    case es384 = "ES384"
+
+    var hashLength: HashLength {
+        switch self {
+        case .es256: .bits256
+        case .es384: .bits384
+        }
+    }
+
+    static func forAuthenticationKey(
+        _ key: SecKey
+    ) throws(AuthenticateWithWebEidError) -> WebEidSignatureAlgorithm {
+        guard let attributes = SecKeyCopyAttributes(key) as? [String: Any],
+              let keyType = attributes[kSecAttrKeyType as String] as? String,
+              let keySizeInBits = attributes[kSecAttrKeySizeInBits as String] as? Int else {
+            throw .failedToDetermineAlgorithm
+        }
+
+        guard keyType == String(kSecAttrKeyTypeECSECPrimeRandom) else {
+            throw .failedToMapAlgorithm
+        }
+
+        switch keySizeInBits {
+        case 256: return .es256
+        case 384: return .es384
+        default: throw .failedToMapAlgorithm
+        }
+    }
+}