Non-modular integration of Common Crypto library into Swift Framework

MySDK.h

@import Foundation;

//! Project version number for MySDK.
FOUNDATION_EXPORT double MySDKVersionNumber;

//! Project version string for MySDK.
FOUNDATION_EXPORT const unsigned char MySDKVersionString[];

// In this header, you should import all the public headers of your framework using statements like #import <MySDK/PublicHeader.h>
#import <MySDK/MySDKCrypto.h>

MySDK.swift

import Foundation

open class MySDK {
      open class func md5sum(input: String) -> String? {
        return MySDKCrypto.md5Hash(input)
      }
}

MySDKCrypto.h

#import <Foundation/Foundation.h>

@interface MySDKCrypto : NSObject

+ (NSString *)md5Hash:(NSString *)string;

@end

MySDKCrypto.m

#import "MySDKCrypto.h"

#import <CommonCrypto/CommonCrypto.h>

@implementation MySDKCrypto

+ (NSString *)md5Hash:(NSString *)string {
    NSData *data = [string dataUsingEncoding:NSUTF8StringEncoding];
    unsigned char result[CC_MD5_DIGEST_LENGTH];

    CC_MD5(data.bytes, (int)data.length, result);

    return [NSString stringWithFormat:
            @"%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x",
            result[0], result[1], result[2], result[3],
            result[4], result[5], result[6], result[7],
            result[8], result[9], result[10], result[11],
            result[12], result[13], result[14], result[15]
            ];
}

@end