mirror of
https://github.com/guanzhi/GmSSL.git
synced 2026-05-06 16:36:16 +08:00
306 lines
7.9 KiB
C
Executable File
306 lines
7.9 KiB
C
Executable File
/*
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* Copyright 2014-2024 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 <gmssl/sm4.h>
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#include <gmssl/mem.h>
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#include <gmssl/hex.h>
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#include <gmssl/error.h>
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static const char *usage = "{-encrypt|-decrypt} -key hex -iv hex [-aad str| -aad_hex hex] [-taglen num] [-in file] [-out file]";
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static const char *options =
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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 Symmetric key in HEX format\n"
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" -iv hex IV in HEX format, 7 to 13 bytes\n"
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" -aad str Authenticated-only message\n"
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" -aad_hex hex Authenticated-only data in HEX format\n"
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" -taglen num MAC tag length, 4 to 16 bytes\n"
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" -in file | stdin Input data\n"
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" -out file | stdout Output data\n"
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"\n"
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"Examples\n"
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"\n"
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" $ TEXT=`gmssl rand -outlen 20 -hex`\n"
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" $ KEY=`gmssl rand -outlen 16 -hex`\n"
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" $ IV=`gmssl rand -outlen 12 -hex`\n"
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" $ AAD=\"The AAD Data\"\n"
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" $ echo -n $TEXT | gmssl sm4_ccm -encrypt -key $KEY -iv $IV -aad $AAD -out sm4_ccm_ciphertext.bin\n"
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" $ gmssl sm4_ccm -decrypt -key $KEY -iv $IV -aad $AAD -in sm4_ccm_ciphertext.bin\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 INITIAL_BUFFER_SIZE = 4096;
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const size_t MAX_BUFFER_SIZE = 512 * 1024 * 1024;
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uint8_t *buffer = NULL;
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size_t buffer_size = INITIAL_BUFFER_SIZE;
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size_t total_read = 0;
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if (!(buffer = (uint8_t *)malloc(INITIAL_BUFFER_SIZE))) {
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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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while (1) {
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size_t bytes_read;
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if (total_read == buffer_size) {
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uint8_t *new_buffer;
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if (buffer_size >= MAX_BUFFER_SIZE) {
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fprintf(stderr, "gmssl %s: input too long, should be less than %zu\n", prog, MAX_BUFFER_SIZE);
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free(buffer);
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return NULL;
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}
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buffer_size = buffer_size * 2;
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if (buffer_size > MAX_BUFFER_SIZE) {
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buffer_size = MAX_BUFFER_SIZE;
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}
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if (!(new_buffer = (uint8_t *)realloc(buffer, buffer_size))) {
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fprintf(stderr, "gmssl %s: realloc failure\n", prog);
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free(buffer);
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return NULL;
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}
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buffer = new_buffer;
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}
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bytes_read = fread(buffer + total_read, 1, buffer_size - total_read, infp);
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total_read += bytes_read;
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if (feof(infp)) {
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break;
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}
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if (ferror(infp)) {
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fprintf(stderr, "gmssl %s: fread error\n", prog);
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perror("error reading input");
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free(buffer);
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return NULL;
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}
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}
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*outlen = total_read;
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return buffer;
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}
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int sm4_ccm_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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char *keyhex = NULL;
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char *ivhex = NULL;
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uint8_t *aad = NULL;
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uint8_t *aad_buf = NULL;
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size_t aadlen = 0;
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int taglen = SM4_CCM_DEFAULT_TAG_SIZE;
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char *infile = NULL;
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char *outfile = NULL;
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uint8_t key[16];
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size_t keylen;
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uint8_t iv[SM4_CCM_MAX_IV_SIZE];
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size_t ivlen;
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FILE *infp = stdin;
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FILE *outfp = stdout;
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SM4_KEY sm4_key;
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uint8_t *inbuf = NULL;
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size_t inlen;
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uint8_t *outbuf = NULL;
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size_t outlen;
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uint8_t *tag;
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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` `-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` `-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) {
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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, "-iv")) {
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if (--argc < 1) goto bad;
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ivhex = *(++argv);
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if (strlen(ivhex) > sizeof(iv) * 2) {
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fprintf(stderr, "gmssl %s: invalid IV length\n", prog);
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goto end;
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}
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if (hex_to_bytes(ivhex, strlen(ivhex), iv, &ivlen) != 1) {
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fprintf(stderr, "gmssl %s: invalid IV hex digits\n", prog);
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goto end;
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}
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if (ivlen < SM4_CCM_MIN_IV_SIZE || ivlen > SM4_CCM_MAX_IV_SIZE) {
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fprintf(stderr, "gmssl %s invalid IV length\n", prog);
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goto end;
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}
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} else if (!strcmp(*argv, "-aad")) {
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if (--argc < 1) goto bad;
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if (aad) {
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fprintf(stderr, "gmssl %s: `-aad` or `aad_hex` has been specified\n", prog);
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goto bad;
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}
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aad = (uint8_t *)(*(++argv));
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aadlen = strlen((char *)aad);
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} else if (!strcmp(*argv, "-aad_hex")) {
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if (--argc < 1) goto bad;
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if (aad) {
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fprintf(stderr, "gmssl %s: `-aad` or `aad_hex` has been specified\n", prog);
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goto bad;
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}
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aad = (uint8_t *)(*(++argv));
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if (!(aad_buf = malloc(strlen((char *)aad)/2 + 1))) {
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fprintf(stderr, "gmssl %s: malloc failure\n", prog);
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goto end;
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}
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if (hex_to_bytes((char *)aad, strlen((char *)aad), aad_buf, &aadlen) != 1) {
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fprintf(stderr, "gmssl %s: `-aad_hex` invalid HEX format argument\n", prog);
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goto end;
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}
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aad = aad_buf;
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} else if (!strcmp(*argv, "-taglen")) {
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if (--argc < 1) goto bad;
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taglen = atoi(*(++argv));
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if (taglen < SM4_CCM_MIN_TAG_SIZE || taglen > SM4_CCM_MAX_TAG_SIZE) {
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fprintf(stderr, "%s: `-taglen` invalid integer argument\n", prog);
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goto end;
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}
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} else if (!strcmp(*argv, "-in")) {
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if (--argc < 1) goto bad;
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infile = *(++argv);
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if (!(infp = fopen(infile, "rb"))) {
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fprintf(stderr, "gmssl %s: open '%s' failure : %s\n", prog, infile, strerror(errno));
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goto end;
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}
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} else if (!strcmp(*argv, "-out")) {
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if (--argc < 1) goto bad;
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outfile = *(++argv);
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if (!(outfp = fopen(outfile, "wb"))) {
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fprintf(stderr, "gmssl %s: open '%s' failure : %s\n", prog, outfile, strerror(errno));
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goto end;
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}
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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 (!ivhex) {
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fprintf(stderr, "gmssl %s: option `-iv` missing\n", prog);
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goto end;
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}
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sm4_set_encrypt_key(&sm4_key, key);
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if (!(inbuf = read_content(infp, &inlen, prog))) {
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goto end;
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}
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if (enc) {
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outlen = inlen + taglen;
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if (!(outbuf = (uint8_t *)malloc(outlen))) {
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fprintf(stderr, "%s: malloc failure\n", prog);
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goto end;
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}
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tag = outbuf + inlen;
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if (sm4_ccm_encrypt(&sm4_key, iv, ivlen, aad, aadlen, inbuf, inlen, outbuf, taglen, tag) != 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 (inlen < taglen) {
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fprintf(stderr, "%s: input length (%zu bytes) shorter than tag length (%d bytes)\n",
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prog, inlen, taglen);
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goto end;
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}
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outlen = inlen - taglen;
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tag = inbuf + inlen - taglen;
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if (!(outbuf = (uint8_t *)malloc(outlen))) {
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fprintf(stderr, "%s: malloc failure\n", prog);
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goto end;
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}
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if (sm4_ccm_decrypt(&sm4_key, iv, ivlen, aad, aadlen, inbuf, inlen - taglen,
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tag, taglen, 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 (fwrite(outbuf, 1, outlen, outfp) != outlen) {
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fprintf(stderr, "%s: fwrite error\n", prog);
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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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gmssl_secure_clear(key, sizeof(key));
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gmssl_secure_clear(iv, sizeof(iv));
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gmssl_secure_clear(&sm4_key, sizeof(sm4_key));
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if (infile && infp) fclose(infp);
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if (outfile && outfp) fclose(outfp);
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if (inbuf) free(inbuf);
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if (outbuf) free(outbuf);
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return ret;
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}
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