diff --git a/ios/Classes/Hash.swift b/ios/Classes/Hash.swift
new file mode 100644
index 0000000..eb6cd3c
--- /dev/null
+++ b/ios/Classes/Hash.swift
@@ -0,0 +1,65 @@
+//
+//  Hash.swift
+//
+//  NativeCryptoPlugin
+//
+//  Copyright (c) 2020
+//  Author: Hugo Pointcheval
+//
+import Foundation
+import CommonCrypto
+
+enum HashAlgorithm: String {
+    case SHA1 = "sha1"
+    case SHA224 = "sha224"
+    case SHA256 = "sha256"
+    case SHA384 = "sha384"
+    case SHA512 = "sha512"
+    
+    var digestLength: Int {
+        switch self {
+        case .SHA1: return Int(CC_SHA1_DIGEST_LENGTH)
+        case .SHA224: return Int(CC_SHA224_DIGEST_LENGTH)
+        case .SHA256: return Int(CC_SHA256_DIGEST_LENGTH)
+        case .SHA384: return Int(CC_SHA384_DIGEST_LENGTH)
+        case .SHA512: return Int(CC_SHA512_DIGEST_LENGTH)
+        }
+    }
+    
+    var pbkdf2: UInt32 {
+        switch self {
+        case .SHA1: return CCPBKDFAlgorithm(kCCPRFHmacAlgSHA1)
+        case .SHA224: return CCPBKDFAlgorithm(kCCPRFHmacAlgSHA224)
+        case .SHA256: return CCPBKDFAlgorithm(kCCPRFHmacAlgSHA256)
+        case .SHA384: return CCPBKDFAlgorithm(kCCPRFHmacAlgSHA384)
+        case .SHA512: return CCPBKDFAlgorithm(kCCPRFHmacAlgSHA512)
+        }
+    }
+}
+
+class Hash {
+    func digest(data: Data?, algorithm: HashAlgorithm) -> Data? {
+        if (data == nil) {
+            return nil
+        }
+        let digestData = Data(count: algorithm.digestLength)
+        let digestBytes = digestData.withUnsafeBytes { $0.load(as: UnsafeMutablePointer<UInt8>.self) }
+        
+        let messageBytes = data!.withUnsafeBytes { $0.load(as: UnsafePointer<UInt8>.self) }
+        
+        switch algorithm {
+        case .SHA1:
+            CC_SHA1(messageBytes, CC_LONG(data!.count), digestBytes)
+        case .SHA224:
+            CC_SHA224(messageBytes, CC_LONG(data!.count), digestBytes)
+        case .SHA256:
+            CC_SHA256(messageBytes, CC_LONG(data!.count), digestBytes)
+        case .SHA384:
+            CC_SHA384(messageBytes, CC_LONG(data!.count), digestBytes)
+        case .SHA512:
+            CC_SHA512(messageBytes, CC_LONG(data!.count), digestBytes)
+        }
+        
+        return digestData
+    }
+}