(Objective-C) Hash Binary Data (SHA256 and other hash algorithms)

Demonstrates how to hash binary bytes using SHA256, SHA384, SHA512, MD2, MD5, HAVAL, RIPEMD, etc.

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#import <CkoBinData.h>
#import <CkoCrypt2.h>
#import <CkoStringBuilder.h>
#import <NSString.h>

// This example requires the Chilkat Crypt API to have been previously unlocked.
// See Unlock Chilkat Crypt for sample code.

// Let's load a binary file to get the bytes..
CkoBinData *jpgData = [[CkoBinData alloc] init];
BOOL success = [jpgData LoadFile: @"qa_data/jpg/starfish.jpg"];
if (success != YES) {
    NSLog(@"%@",@"Failed to load file.");
    return;
}

NSData jpgBytes;
jpgBytes = [jpgData GetBinary];

CkoCrypt2 *crypt = [[CkoCrypt2 alloc] init];

// Choose the hash algorithm.
// Can be  "sha1", "sha256", "sha384", "sha512", "md2", "md5", "haval", "ripemd128", "ripemd160","ripemd256", or "ripemd320".
crypt.HashAlgorithm = @"sha256";

NSData hashBytes;
hashBytes = [crypt HashBytes: jpgBytes];

// Let's examine the hash as a hex string.
CkoStringBuilder *sb = [[CkoStringBuilder alloc] init];
[sb AppendEncoded: hashBytes encoding: @"hex"];
NSLog(@"%@%@",@"SHA256 hash = ",[sb GetAsString]);

// We could alternatively hash the bytes and receive the hex result directly:
crypt.EncodingMode = @"hex";
NSString *hashHexStr = [crypt HashBytesENC: jpgBytes];
NSLog(@"%@%@",@"SHA256 hash = ",hashHexStr);