【Object-C】ハッシュSHA-256のサンプルコード

◆宣言

#include <CommonCrypto/CommonDigest.h>


◇メソッド

- (NSString *)hashed_string:(NSString *)input

{

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

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

    uint8_t digest[64];

    

    // This is an iOS5-specific method.

    // It takes in the data, how much data, and then output format, which in this case is an int array.

    CC_SHA256(data.bytes, data.length, digest);

    

    NSMutableString* output = [NSMutableString stringWithCapacity:64];

    

    // Parse through the CC_SHA256 results (stored inside of digest[]).

    for(int i = 0; i < 32; i++) {

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

    }

    

    return output;

}

@end