+(unsigned char*)hexEnc:(NSString*)strInput{NSData* data = [strInput dataUsingEncoding:NSUTF8StringEncoding];NSUInteger length = data.length;NSUInteger plusLength;if(length % 16 == 0){plusLength = 0;}else{plusLength = 16 - length % 16;}NSMutableString* new_str = [[NSMutableString alloc] initWithString:strInput];for (int i =0;i < plusLength;i++) {[new_str appendString:@" "];}NSUInteger new_length = length+plusLength;Uchar *input = (Uchar*)malloc(sizeof(Uchar)*new_length);Uchar *output = (Uchar*)malloc(sizeof(Uchar)*new_length);Uchar key[16] = KEY;const char *utfChar = [new_str UTF8String];memset(input, 0, new_length);memcpy(input, utfChar, new_length);sm4_context ctx;unsigned long i;sm4_setkey_enc(&ctx,key);sm4_crypt_ecb(&ctx,1,new_length,input,output);for(i=0;i<new_length;i++)printf("%02x ", output[i]);printf("\n");unsigned char* c_str = Hex2Str(output,new_length);printf("%s\n", c_str);free(input);free(output);return c_str;
}

+(unsigned char*)hexDec:(NSString*)strInput{int inputCharSize = strInput.length/2;Uchar* input = (Uchar*)malloc(sizeof(Uchar)*inputCharSize);Uchar* output = (Uchar*)malloc(sizeof(Uchar)*inputCharSize);for (int i = 0; i<inputCharSize; i++) {NSString* str = [strInput substringWithRange:NSMakeRange(i*2, 2)];NSString* gw = [str substringWithRange:NSMakeRange(0, 1)];NSString* dw = [str substringWithRange:NSMakeRange(1, 1)];int n_gw = [HexToStr str2Int:gw];int n_dw = [HexToStr str2Int:dw];int result = n_gw * 16 + n_dw;input[i] = result;}Uchar key[16] = KEY;sm4_context ctx;sm4_setkey_dec(&ctx,key);sm4_crypt_ecb(&ctx,0,inputCharSize,input,output);int kgPos = 0;for(int i=0;i<inputCharSize;i++){printf("%02x ", output[i]);if (output[i] == 32) {kgPos = i;output[i] = '\0';}}printf("\n");free(input);
//    free(output);return output;
}