CODEWITHSUNDEEP
swiftsha256commoncrypto
kimpro
kimpro

Reputation: 349

how to use SHA256 with salt(some key) in swift

I found we can hash some string with CommonCrypto. and I see some examples but they don't use salt. how can i use the SHA256 with salt?

Upvotes: 5

Views: 5778

Answers (2)

sundance
sundance

Reputation: 3020

Complete solution for Swift 4:

extension Data {

    var hexString: String {
        return map { String(format: "%02hhx", $0) }.joined()
    }

    var sha256: Data {
        var digest = [UInt8](repeating: 0, count: Int(CC_SHA256_DIGEST_LENGTH))
        self.withUnsafeBytes({
            _ = CC_SHA256($0, CC_LONG(self.count), &digest)
        })
        return Data(bytes: digest)
    }

}

extension String {

    func sha256(salt: String) -> Data {
        return (self + salt).data(using: .utf8)!.sha256
    }

}

Example:

let hash = "test".sha256(salt: "salt").hexString

Upvotes: 5

Mattias
Mattias

Reputation: 2306

Combine your indata with a salt and run the hash calculation;

func hash(input: String, salt: String) -> String {
    let toHash = input + salt

    // TODO: Calculate the SHA256 hash of "toHash" and return it
    // return sha256(toHash)

    // Return the input data and hash for now
    return toHash
}

print(hash("somedata", salt: "1m8f")) // Prints "somedata1m8f"

Upvotes: 4

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