Swift String extension to calculate MD5

String+md5.swift

import Foundation

extension String {
    var md5: String? {
        let length = Int(CC_MD5_DIGEST_LENGTH)
        
        guard let data = self.data(using: String.Encoding.utf8) else { return nil }
        
        let hash = data.withUnsafeBytes { (bytes: UnsafeRawBufferPointer) -> [UInt8] in
            var hash: [UInt8] = [UInt8](repeating: 0, count: Int(CC_MD5_DIGEST_LENGTH))
            CC_MD5(bytes.baseAddress, CC_LONG(data.count), &hash)
            return hash
        }
        
        return (0..<length).map { String(format: "%02x", hash[$0]) }.joined()
    }
}

'CC_MD5' was deprecated in iOS 13.0: This function is cryptographically broken and should not be used in security contexts. Clients should migrate to SHA256 (or stronger).