Objective C 에서 sha512 사용하기

1.

This function will hash a string using SHA512. The resulting string is a hex representation of the hash:

+ (NSString *) createSHA512:(NSString *)source {



    const char *s = [source cStringUsingEncoding:NSASCIIStringEncoding];



    NSData *keyData = [NSData dataWithBytes:s length:strlen(s)];



    uint8_t digest[CC_SHA512_DIGEST_LENGTH] = {0};



    CC_SHA512(keyData.bytes, keyData.length, digest);



    NSData *out = [NSData dataWithBytes:digest length:CC_SHA512_DIGEST_LENGTH];



    return [out description];

}

Don't forget to include the correct header:

#include <CommonCrypto/CommonDigest.h>



2.



I am using this one: It matches PHP SHA512 algorithm output.
(NSString *)createSHA512:(NSString *)string

{

    const char *cstr = [string cStringUsingEncoding:NSUTF8StringEncoding];

    NSData *data = [NSData dataWithBytes:cstr length:string.length];

    uint8_t digest[CC_SHA512_DIGEST_LENGTH];

    CC_SHA512(data.bytes, data.length, digest);

    NSMutableString* output = [NSMutableString  StringWithCapacity:CC_SHA512_DIGEST_LENGTH * 2];



    for(int i = 0; i < CC_SHA512_DIGEST_LENGTH; i++)

        [output appendFormat:@"%02x", digest[i]];

    return output;

}
출처 : http://stackoverflow.com/questions/3829068/hash-a-password-string-using-sha512-like-c-sharp