mirror of
https://github.com/guanzhi/GmSSL.git
synced 2026-06-27 15:43:42 +08:00
361 lines
8.2 KiB
C
361 lines
8.2 KiB
C
/*
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* Copyright 2014-2026 The GmSSL Project. All Rights Reserved.
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*
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* Licensed under the Apache License, Version 2.0 (the License); you may
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* not use this file except in compliance with the License.
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*/
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#include <stdio.h>
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#include <errno.h>
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#include <string.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <gmssl/ff1.h>
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#include <gmssl/hex.h>
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#include <gmssl/mem.h>
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#include <gmssl/error.h>
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#define SM4_FF1_MAX_TWEAK_SIZE FF1_MAX_TWEAK_SIZE
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#define ID_CARD_DIGITS 18
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#define ID_CARD_BODY_DIGITS 17
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static const char *usage =
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"{-encrypt|-decrypt} -key hex [-tweak hex] [-idcard|-bankcard] [-digits digits]";
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static const char *options =
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"\n"
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"Options\n"
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"\n"
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" -encrypt Encrypt\n"
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" -decrypt Decrypt\n"
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" -key hex SM4 key in HEX format\n"
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" -tweak hex FF1 tweak in HEX format\n"
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" -digits digits Input digits, default from stdin\n"
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" -idcard Input is a Chinese resident identity card number\n"
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" -bankcard Input is a bank card number with Luhn check digit\n"
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"\n";
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static uint8_t *read_content(FILE *infp, size_t *outlen, const char *prog)
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{
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const size_t maxlen = 4096;
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uint8_t *buf = NULL;
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size_t len;
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if (!(buf = malloc(maxlen + 1))) {
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fprintf(stderr, "gmssl %s: malloc failure\n", prog);
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return NULL;
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}
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len = fread(buf, 1, maxlen, infp);
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if (ferror(infp)) {
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fprintf(stderr, "gmssl %s: read failure : %s\n", prog, strerror(errno));
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free(buf);
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return NULL;
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}
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if (!feof(infp)) {
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fprintf(stderr, "gmssl %s: input too long\n", prog);
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free(buf);
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return NULL;
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}
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while (len && (buf[len - 1] == '\n' || buf[len - 1] == '\r')) {
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len--;
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}
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buf[len] = 0;
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*outlen = len;
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return buf;
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}
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static int is_digits(const char *s, size_t len)
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{
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size_t i;
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if (!s) {
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return 0;
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}
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for (i = 0; i < len; i++) {
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if (s[i] < '0' || s[i] > '9') {
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return 0;
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}
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}
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return 1;
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}
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static int idcard_check_digit(const char body[ID_CARD_BODY_DIGITS])
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{
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static const int weights[ID_CARD_BODY_DIGITS] = {
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7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2,
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};
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static const char check_digits[] = "10X98765432";
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int sum = 0;
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size_t i;
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if (!is_digits(body, ID_CARD_BODY_DIGITS)) {
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return -1;
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}
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for (i = 0; i < ID_CARD_BODY_DIGITS; i++) {
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sum += (body[i] - '0') * weights[i];
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}
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return check_digits[sum % 11];
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}
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static int idcard_check(const char *s, size_t len)
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{
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int ch;
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char last;
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if (!s || len != ID_CARD_DIGITS) {
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return -1;
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}
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ch = idcard_check_digit(s);
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if (ch < 0) {
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return -1;
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}
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last = s[ID_CARD_DIGITS - 1];
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if (last == 'x') {
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last = 'X';
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}
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return last == ch ? 1 : -1;
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}
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static int luhn_check_digit(const char *body, size_t len)
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{
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int sum = 0;
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int double_digit = 1;
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if (!is_digits(body, len)) {
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return -1;
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}
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while (len) {
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int digit = body[--len] - '0';
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if (double_digit) {
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digit *= 2;
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if (digit > 9) {
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digit -= 9;
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}
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}
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sum += digit;
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double_digit = !double_digit;
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}
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return '0' + (10 - sum % 10) % 10;
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}
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static int bankcard_check(const char *s, size_t len)
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{
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int ch;
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if (!s || len < FF1_MIN_DIGITS + 1 || len > FF1_MAX_DIGITS + 1 || !is_digits(s, len)) {
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return -1;
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}
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ch = luhn_check_digit(s, len - 1);
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if (ch < 0) {
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return -1;
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}
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return s[len - 1] == ch ? 1 : -1;
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}
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int sm4_ff1_main(int argc, char **argv)
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{
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int ret = 1;
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char *prog = argv[0];
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int enc = -1;
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int idcard = 0;
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int bankcard = 0;
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char *keyhex = NULL;
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char *tweakhex = NULL;
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char *digits = NULL;
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uint8_t key[16];
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uint8_t tweak[SM4_FF1_MAX_TWEAK_SIZE];
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size_t keylen = 0;
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size_t tweaklen = 0;
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uint8_t *inbuf = NULL;
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int inbuf_alloc = 0;
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size_t inlen;
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char outbuf[FF1_MAX_DIGITS + 2];
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size_t bodylen;
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BLOCK_CIPHER_KEY block_key;
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argc--;
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argv++;
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if (argc < 1) {
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fprintf(stderr, "usage: gmssl %s %s\n", prog, usage);
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return 1;
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}
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while (argc > 0) {
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if (!strcmp(*argv, "-help")) {
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printf("usage: gmssl %s %s\n", prog, usage);
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printf("%s\n", options);
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ret = 0;
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goto end;
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} else if (!strcmp(*argv, "-encrypt")) {
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if (enc == 0) {
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fprintf(stderr, "gmssl %s: `-encrypt` and `-decrypt` should not be used together\n", prog);
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goto end;
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}
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enc = 1;
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} else if (!strcmp(*argv, "-decrypt")) {
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if (enc == 1) {
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fprintf(stderr, "gmssl %s: `-encrypt` and `-decrypt` should not be used together\n", prog);
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goto end;
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}
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enc = 0;
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} else if (!strcmp(*argv, "-key")) {
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if (--argc < 1) goto bad;
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keyhex = *(++argv);
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if (strlen(keyhex) != sizeof(key) * 2) {
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fprintf(stderr, "gmssl %s: invalid key length\n", prog);
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goto end;
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}
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if (hex_to_bytes(keyhex, strlen(keyhex), key, &keylen) != 1 || keylen != sizeof(key)) {
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fprintf(stderr, "gmssl %s: invalid key hex digits\n", prog);
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goto end;
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}
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} else if (!strcmp(*argv, "-tweak")) {
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if (--argc < 1) goto bad;
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tweakhex = *(++argv);
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if (strlen(tweakhex) > sizeof(tweak) * 2) {
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fprintf(stderr, "gmssl %s: invalid tweak length\n", prog);
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goto end;
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}
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if (!strlen(tweakhex)) {
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tweaklen = 0;
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} else if (hex_to_bytes(tweakhex, strlen(tweakhex), tweak, &tweaklen) != 1) {
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fprintf(stderr, "gmssl %s: invalid tweak hex digits\n", prog);
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goto end;
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}
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} else if (!strcmp(*argv, "-digits")) {
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if (--argc < 1) goto bad;
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if (digits) {
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fprintf(stderr, "gmssl %s: option `-digits` should be set only once\n", prog);
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goto end;
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}
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digits = *(++argv);
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} else if (!strcmp(*argv, "-idcard")) {
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if (bankcard) {
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fprintf(stderr, "gmssl %s: `-idcard` and `-bankcard` should not be used together\n", prog);
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goto end;
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}
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idcard = 1;
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} else if (!strcmp(*argv, "-bankcard")) {
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if (idcard) {
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fprintf(stderr, "gmssl %s: `-idcard` and `-bankcard` should not be used together\n", prog);
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goto end;
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}
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bankcard = 1;
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} else {
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fprintf(stderr, "gmssl %s: illegal option `%s`\n", prog, *argv);
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goto end;
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bad:
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fprintf(stderr, "gmssl %s: `%s` option value missing\n", prog, *argv);
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goto end;
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}
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argc--;
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argv++;
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}
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if (enc < 0) {
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fprintf(stderr, "gmssl %s: option -encrypt or -decrypt should be set\n", prog);
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goto end;
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}
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if (!keyhex) {
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fprintf(stderr, "gmssl %s: option `-key` missing\n", prog);
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goto end;
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}
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if (tweakhex && tweaklen > FF1_MAX_TWEAK_SIZE) {
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fprintf(stderr, "gmssl %s: invalid tweak length\n", prog);
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goto end;
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}
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if (digits) {
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inbuf = (uint8_t *)digits;
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inlen = strlen(digits);
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} else {
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if (!(inbuf = read_content(stdin, &inlen, prog))) {
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goto end;
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}
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inbuf_alloc = 1;
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}
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if (!inlen) {
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fprintf(stderr, "gmssl %s: empty input\n", prog);
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goto end;
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}
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if (idcard) {
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if (idcard_check((char *)inbuf, inlen) != 1) {
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fprintf(stderr, "gmssl %s: invalid identity card number\n", prog);
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goto end;
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}
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bodylen = ID_CARD_BODY_DIGITS;
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} else if (bankcard) {
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if (bankcard_check((char *)inbuf, inlen) != 1) {
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fprintf(stderr, "gmssl %s: invalid bank card number\n", prog);
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goto end;
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}
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bodylen = inlen - 1;
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} else {
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if (inlen < FF1_MIN_DIGITS || inlen > FF1_MAX_DIGITS || !is_digits((char *)inbuf, inlen)) {
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fprintf(stderr, "gmssl %s: invalid input digits\n", prog);
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goto end;
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}
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bodylen = inlen;
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}
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if (ff1_init(&block_key, BLOCK_CIPHER_sm4(), key) != 1) {
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error_print();
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goto end;
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}
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if (enc) {
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if (ff1_encrypt(&block_key, (char *)inbuf, bodylen, tweak, tweaklen, outbuf) != 1) {
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error_print();
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goto end;
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}
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} else {
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if (ff1_decrypt(&block_key, (char *)inbuf, bodylen, tweak, tweaklen, outbuf) != 1) {
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error_print();
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goto end;
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}
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}
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if (idcard) {
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int ch = idcard_check_digit(outbuf);
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if (ch < 0) {
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error_print();
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goto end;
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}
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outbuf[bodylen] = (char)ch;
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outbuf[bodylen + 1] = '\0';
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bodylen++;
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} else if (bankcard) {
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int ch = luhn_check_digit(outbuf, bodylen);
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if (ch < 0) {
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error_print();
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goto end;
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}
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outbuf[bodylen] = (char)ch;
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outbuf[bodylen + 1] = '\0';
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bodylen++;
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}
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if (fwrite(outbuf, 1, bodylen, stdout) != bodylen) {
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fprintf(stderr, "gmssl %s: output failure : %s\n", prog, strerror(errno));
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goto end;
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}
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if (fputc('\n', stdout) == EOF) {
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fprintf(stderr, "gmssl %s: output failure : %s\n", prog, strerror(errno));
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goto end;
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}
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ret = 0;
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end:
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if (inbuf_alloc) free(inbuf);
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gmssl_secure_clear(key, sizeof(key));
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gmssl_secure_clear(tweak, sizeof(tweak));
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gmssl_secure_clear(&block_key, sizeof(block_key));
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return ret;
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}
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