MD5StringFromBytes

gistfile1.m

#import <CommonCrypto/CommonDigest.h>

NSString *MD5StringFromBytes(uint8_t *bytes, NSUInteger count)
{
    uint8_t md5Bytes[CC_MD5_DIGEST_LENGTH];
    CC_MD5(bytes, count, md5Bytes);

    // convert to hex string
    static char hexLookup[] = "0123456789abcdef";
    char hexCString[CC_MD5_DIGEST_LENGTH * 2 + 1]; // each byte converts to two hex characters, plus null terminator

    for (int i = 0; i < CC_MD5_DIGEST_LENGTH; ++i) {
        uint8_t fullByte = md5Bytes[i];


        hexCString[2 * i] = hexLookup[fullByte >> 4];          // high-order nibble first
        hexCString[2 * i + 1] = hexLookup[fullByte & 0x0F];    // low-order
    }
    hexCString[CC_MD5_DIGEST_LENGTH * 2] = 0; // null terminate

    return [NSString stringWithUTF8String:hexCString];
}