How to Compute the Sha512/256 Hash In Swift?

10 minutes read

To compute the SHA512/256 hash in Swift, you can use Apple's CommonCrypto framework. First, import the framework into your project by adding import CommonCrypto at the top of your Swift file. Then, you can use the following code snippet to calculate the SHA512/256 hash of a given input string:

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func sha512_256(string: String) -> String {
    if let data = string.data(using: .utf8) {
        var hash = [UInt8](repeating: 0, count: Int(CC_SHA512_DIGEST_LENGTH))
        data.withUnsafeBytes {
            _ = CC_SHA512($0.baseAddress, CC_LONG(data.count), &hash)
        }
        
        var truncatedHash = [UInt8](repeating: 0, count: Int(CC_SHA512_256_DIGEST_LENGTH))
        for i in 0..<Int(CC_SHA512_256_DIGEST_LENGTH) {
            truncatedHash[i] = hash[i]
        }
        
        let hashString = truncatedHash.map { String(format: "%02x", $0) }.joined()
        return hashString
    }
    
    return ""
}


You can call this function with a string input and it will return the SHA512/256 hash as a hexadecimal string. Remember to handle any errors or edge cases that may arise when using cryptographic functions.

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What is the recommended key length for sha512/256 hashing in Swift?

Recommended key length for SHA-512/256 hashing in Swift is 256 bits.


How to handle collisions in sha512/256 hashing functions in Swift?

In Swift, you can handle collisions in SHA512/256 hashing functions by using a dictionary to store key-value pairs. If a collision occurs, you can store the hash value as the key in the dictionary and the corresponding value in an array. When you need to retrieve the value for a given key, you can hash the key and check if the resulting hash value is already stored in the dictionary. If it is, you can then look up the corresponding value in the array.


Here is an example implementation:

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import CryptoKit

var hashTable: [String: [String]] = [:]

func hashValue(for key: String) -> String {
    let digest = Insecure.SHA512.hash(data: key.data(using: .utf8)!)
    return digest.map { String(format: "%02hhx", $0) }.joined()
}

func setValue(_ value: String, forKey key: String) {
    let keyHash = hashValue(for: key)
    
    if hashTable[keyHash] != nil {
        hashTable[keyHash]?.append(value)
    } else {
        hashTable[keyHash] = [value]
    }
}

func getValue(forKey key: String) -> String? {
    let keyHash = hashValue(for: key)
    
    if let values = hashTable[keyHash] {
        return values.first
    } else {
        return nil
    }
}

// Example usage
setValue("value1", forKey: "key1")
setValue("value2", forKey: "key1")
setValue("value3", forKey: "key2")

print(getValue(forKey: "key1")) // Output: "value1"
print(getValue(forKey: "key2")) // Output: "value3"


This implementation uses the CryptoKit framework in Swift to calculate the SHA512 hash of the key. The hashTable dictionary acts as a hash table to store key-value pairs, handling collisions by storing multiple values for the same hash key in an array. The setValue function adds a new key-value pair to the hash table, while the getValue function retrieves the first value associated with a given key.


How to compare two sha512/256 hashes for equality in Swift?

You can compare two sha512/256 hashes for equality in Swift by converting the hashes to Data objects and then comparing them byte by byte. Here's an example of how you can do this:

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import CryptoKit

func compareHashes(hash1: String, hash2: String) -> Bool {
    guard let data1 = Data(base64Encoded: hash1),
          let data2 = Data(base64Encoded: hash2) else {
        return false
    }

    return data1 == data2
}

let hash1 = "Yg63iBnQKbsDRPSkG4OgoU7J+
let hash2 = "Yg63iBnQKbsDRPSkG4OgoU7J+

if compareHashes(hash1: hash1, hash2: hash2) {
    print("The hashes are equal")
} else {
    print("The hashes are not equal")
}


In this code snippet, the compareHashes function takes two sha512/256 hashes as input and converts them to Data objects using the base64Encoded initializer. It then compares the two Data objects using the == operator and returns true if they are equal, and false otherwise. Finally, the function is called with two example sha512/256 hashes, and the result is printed to the console.

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