SHA256 in Swift - Importing framework issue

Question

I'm trying to use CC_SHA256_DIGEST_LENGTH in one of my functions in Swift and it throws an error because it cannot find that symbol. I've tried everything, importing CommonCrypto in the bridge-header and trying that .map solution.. Nothing works.

How can I use CC_SHA256_DIGEST_LENGTH in Swift? All the solutions seems to have stopped working. Thank you!

It always helps to include the problem code and the exact and full error message in the question. — zaph, Oct 19 '14 at 12:37
And in this case the framework versions would be nice as well. — Maarten Bodewes, Oct 19 '14 at 12:51

zaph · Accepted Answer · 2017-09-19T15:28:19.493

Add the following line to your bridging header:
#import <CommonCrypto/CommonHMAC.h>

Swift 2.x example:

func doSha256(#dataIn:NSData) -> NSData {
    var shaOut: NSMutableData! = NSMutableData(length: Int(CC_SHA256_DIGEST_LENGTH));
    CC_SHA256(dataIn.bytes, CC_LONG(dataIn.length), UnsafeMutablePointer<UInt8>(shaOut.mutableBytes));

    return shaOut;
}

Swift 3.0 example:

func hashSHA256(data:Data) -> Data? {
    var hashData = Data(count: Int(CC_SHA256_DIGEST_LENGTH))
    _ = hashData.withUnsafeMutableBytes {digestBytes in
        data.withUnsafeBytes {messageBytes in
            CC_SHA256(messageBytes, CC_LONG(data.count), digestBytes)
        }
    }
    return hashData
}

let clearData   = "clearData0123456".data(using:String.Encoding.utf8)!
print("clearData: \(clearData.map { String(format: "%02hhx", $0) }.joined())")

let hash = hashSHA256(data:clearData)
print("hash: \(hash!.map { String(format: "%02hhx", $0) }.joined())")

Output:

clearData: 636c6561724461746130313233343536
hash: aabc766b6b357564e41f4f912d494bccbfa16924b574abbdba9e3e9da0c8920a

I don't have any frameworks added in the target Build Phases.
Be are you sure that the bridging-header is set up correctly? I added mine by adding a .m file and let the system automatically add the bridging-header and update any target settings.

General hash method moved from the sunsetted documentation section:

This function takes a hash name and Data to be hashed and returns a Data:

name: A name of a hash function as a String  
data: The Data to be hashed  
returns: the hashed result as Data

func hash(name:String, data:Data) -> Data? {
    let algos = ["MD2":    (CC_MD2,    CC_MD2_DIGEST_LENGTH),
                 "MD4":    (CC_MD4,    CC_MD4_DIGEST_LENGTH),
                 "MD5":    (CC_MD5,    CC_MD5_DIGEST_LENGTH),
                 "SHA1":   (CC_SHA1,   CC_SHA1_DIGEST_LENGTH),
                 "SHA224": (CC_SHA224, CC_SHA224_DIGEST_LENGTH),
                 "SHA256": (CC_SHA256, CC_SHA256_DIGEST_LENGTH),
                 "SHA384": (CC_SHA384, CC_SHA384_DIGEST_LENGTH),
                 "SHA512": (CC_SHA512, CC_SHA512_DIGEST_LENGTH)]
    guard let (hashAlgorithm, length) = algos[name]  else { return nil }
    var hashData = Data(count: Int(length))

    _ = hashData.withUnsafeMutableBytes {digestBytes in
        data.withUnsafeBytes {messageBytes in
            hashAlgorithm(messageBytes, CC_LONG(data.count), digestBytes)
        }
    }
    return hashData
}

Note: MD2, MD4, MD5 and SHA1 should not be used in new work, they are no longer secure for message digest usage.

Still getting the error "Use of unresolved identifier 'CC_SHA256_DIGEST_LENGTH'" as well as the same errors for CC_LONG and CC_SHA256. I have the CommonCrypto import in the bridge-header. Do I need to add any frameworks to the project? Can't get this to work :( — Hjalmar, Oct 19 '14 at 15:51
FINALLY! The problem was that one of the targets were not ticked when I imported the .m-file to generate a bridging header. Thanks for your help! — Hjalmar, Oct 19 '14 at 16:32
found it: http://www.learnswiftonline.com/getting-started/adding-swift-bridging-header/ oh, also important https://stackoverflow.com/questions/26096402/xcode-myprojectname-bridging-header-h-does-not-exist — pete, Jul 15 '17 at 21:10
@Panda Thanks for finding the link to the sunsetted documentation section. I have added that to the answer. — zaph, Sep 19 '17 at 15:31

score 2 · Answer 2 · answered May 19 '23 at 00:14

2

None of the above worked for me. here is what's worked for swift5:

import CryptoKit
import CommonCrypto

Then:

let hash = SHA256.hash(data: data).

answered May 19 '23 at 00:14

us_david

4,431
35
29

SHA256 in Swift - Importing framework issue

2 Answers2

Linked