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- (NSString *) md5
{
    const char *cStr = [self UTF8String];
    unsigned char result[16];
    CC_MD5( cStr, (unsigned int) strlen(cStr), result);
    return [NSString stringWithFormat:
                        @"%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x",
                        result[0], result[1], result[2], result[3], 
                        result[4], result[5], result[6], result[7],
                        result[8], result[9], result[10], result[11],
                        result[12], result[13], result[14], result[15]
                        ];      
}

- (NSString *) md5 { const char *cStr = [self UTF8String]; unsigned char result[16]; CC_MD5( cStr, (unsigned int) strlen(cStr), result); return [NSString stringWithFormat: @"%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x", result[0], result[1], result[2], result[3], result[4], result[5], result[6], result[7], result[8], result[9], result[10], result[11], result[12], result[13], result[14], result[15] ]; }