Generate SHA256 hash in Objective-C

问题

So I need to generate a Sha256 password in Objective-C, and can't figure out for the life of me how to do it! Is there something easy I'm just missing?

I've tried implementing the following method (which was written for iPhone, but I figured maybe it'd work cross-platform, as some Objective-C code does)

-(NSString*)sha256HashFor:(NSString*)input
{
    const char* str = [input UTF8String];
    unsigned char result[CC_SHA256_DIGEST_LENGTH];
    CC_SHA256(str, strlen(str), result);

    NSMutableString *ret = [NSMutableString stringWithCapacity:CC_SHA256_DIGEST_LENGTH*2];
    for(int i = 0; i<CC_SHA256_DIGEST_LENGTH; i++)
    {
        [ret appendFormat:@"%02x",result[i]];
    }
    return ret;
}

But that just spat out errors about CC_SHA256_DIGEST_LENGTH being an undeclared identifier.

回答1:

You need to include the appropriate header file:

#include <CommonCrypto/CommonDigest.h>

According to the Cryptographic Services documentation this should be available on both iOS and OS X.

In OS X v10.5 and later and iOS 5.0 and later, Common Crypto provides low-level C support for encryption and decryption. Common Crypto is not as straightforward as Security Transforms, but provides a wider range of features, including additional hashing schemes, cipher modes, and so on.

回答2:

#import <CommonCrypto/CommonDigest.h>

Objective-C: SHA256 is only two lines:

+ (NSData *)doSha256:(NSData *)dataIn {
    NSMutableData *macOut = [NSMutableData dataWithLength:CC_SHA256_DIGEST_LENGTH];
    CC_SHA256(dataIn.bytes, dataIn.length, macOut.mutableBytes);
    return macOut;
}

Swift 3

func sha256Hex(string: String) -> String? {
    guard let messageData = string.data(using:String.Encoding.utf8) else { return nil }
    var digestData = Data(count: Int(CC_SHA256_DIGEST_LENGTH))

    _ = digestData.withUnsafeMutableBytes {digestBytes in
        messageData.withUnsafeBytes {messageBytes in
            CC_SHA256(messageBytes, CC_LONG(messageData.count), digestBytes)
        }
    }

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

// Test

let sha256HexString = sha256Hex(string:"Hello")
print("sha256HexString: \(sha256HexString!)")

sha256HexString: "185f8db32271fe25f561a6fc938b2e264306ec304eda518007d1764826381969"

回答3:

Check out the NSHash cocoa pod. It has a bunch of different hashing methods including SHA256.

https://github.com/jerolimov/NSHash

回答4:

a modified version of @zaph answer in Objective-C with NSString as input and output:

-(NSString*)sha256HashFor:(NSString*)input
{
    NSData* data = [input dataUsingEncoding:NSUTF8StringEncoding];
    NSMutableData *sha256Data = [NSMutableData dataWithLength:CC_SHA256_DIGEST_LENGTH];
    CC_SHA256([data bytes], (CC_LONG)[data length], [sha256Data mutableBytes]);
    return [sha256Data base64EncodedStringWithOptions:0];
}

来源：https://stackoverflow.com/questions/16866001/generate-sha256-hash-in-objective-c

标签

objective-c

macos

passwords

sha256

password-hash