mirror of
https://github.com/guanzhi/GmSSL.git
synced 2026-08-06 11:53:39 +08:00
278 lines
7.2 KiB
C
Executable File
278 lines
7.2 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 [-pkcs7_padding] [-in file] [-out file]";
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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 Symmetric key in HEX format\n"
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" -iv hex IV in HEX format\n"
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" -pkcs7_padding Enable PKCS#7 padding\n"
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" Encrypt input can be any byte length; decrypt input must be a multiple of 16 bytes\n"
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" -in file | stdin Input data. Without `-pkcs7_padding`, input length must be a multiple of 16 bytes\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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" KEY=`gmssl rand -outlen 16 -hex`\n"
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" IV=`gmssl rand -outlen 16 -hex`\n"
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" echo -n 0123456789abcdef | gmssl sm4_cbc -encrypt -key $KEY -iv $IV -out sm4_cbc_ciphertext.bin\n"
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" gmssl sm4_cbc -decrypt -key $KEY -iv $IV -in sm4_cbc_ciphertext.bin\n"
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"\n"
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" echo -n abc | gmssl sm4_cbc -encrypt -pkcs7_padding -key $KEY -iv $IV -out sm4_cbc_ciphertext.bin\n"
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" gmssl sm4_cbc -decrypt -pkcs7_padding -key $KEY -iv $IV -in sm4_cbc_ciphertext.bin\n"
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"\n";
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int sm4_cbc_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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char *infile = NULL;
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char *outfile = NULL;
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int pkcs7_padding = 0;
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uint8_t key[16];
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size_t keylen;
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uint8_t iv[16];
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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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SM4_CBC_CTX ctx;
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uint8_t buf[4096];
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uint8_t outbuf[4096];
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uint8_t block[16];
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size_t block_nbytes = 0;
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size_t inlen;
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size_t outlen;
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size_t nblocks;
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size_t len;
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size_t left;
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size_t inpos;
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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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} else if (!strcmp(*argv, "-pkcs7_padding")) {
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pkcs7_padding = 1;
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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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if (pkcs7_padding && enc) {
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if (sm4_cbc_encrypt_init(&ctx, key, iv) != 1) {
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error_print();
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goto end;
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}
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} else if (pkcs7_padding) {
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if (sm4_cbc_decrypt_init(&ctx, key, iv) != 1) {
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error_print();
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goto end;
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}
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} else if (enc) {
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sm4_set_encrypt_key(&sm4_key, key);
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} else {
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sm4_set_decrypt_key(&sm4_key, key);
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}
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while ((inlen = fread(buf, 1, sizeof(buf), infp)) > 0) {
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if (pkcs7_padding && enc) {
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if (sm4_cbc_encrypt_update(&ctx, buf, inlen, buf, &outlen) != 1) {
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error_print();
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goto end;
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}
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} else if (pkcs7_padding) {
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if (sm4_cbc_decrypt_update(&ctx, buf, inlen, buf, &outlen) != 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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outlen = 0;
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inpos = 0;
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if (block_nbytes) {
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left = sizeof(block) - block_nbytes;
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if (inlen < left) {
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memcpy(block + block_nbytes, buf, inlen);
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block_nbytes += inlen;
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continue;
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}
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memcpy(block + block_nbytes, buf, left);
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if (enc) {
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sm4_cbc_encrypt_blocks(&sm4_key, iv, block, 1, outbuf);
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} else {
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sm4_cbc_decrypt_blocks(&sm4_key, iv, block, 1, outbuf);
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}
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outlen = sizeof(block);
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inpos = left;
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block_nbytes = 0;
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}
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nblocks = (inlen - inpos) / sizeof(block);
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len = nblocks * sizeof(block);
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if (len) {
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if (enc) {
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sm4_cbc_encrypt_blocks(&sm4_key, iv, buf + inpos, nblocks, outbuf + outlen);
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} else {
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sm4_cbc_decrypt_blocks(&sm4_key, iv, buf + inpos, nblocks, outbuf + outlen);
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}
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outlen += len;
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inpos += len;
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}
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if (inlen > inpos) {
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block_nbytes = inlen - inpos;
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memcpy(block, buf + inpos, block_nbytes);
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}
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}
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if (fwrite(pkcs7_padding ? buf : outbuf, 1, outlen, outfp) != outlen) {
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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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}
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if (ferror(infp)) {
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fprintf(stderr, "%s: read failure\n", prog);
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goto end;
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}
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if (pkcs7_padding && enc) {
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if (sm4_cbc_encrypt_finish(&ctx, buf, &outlen) != 1) {
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error_print();
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goto end;
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}
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} else if (pkcs7_padding) {
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if (sm4_cbc_decrypt_finish(&ctx, buf, &outlen) != 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 (block_nbytes) {
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fprintf(stderr, "gmssl %s: input length must be multiple of 16 bytes when PKCS#7 padding is not enabled\n", prog);
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goto end;
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}
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outlen = 0;
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}
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if (fwrite(buf, 1, outlen, outfp) != outlen) {
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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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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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gmssl_secure_clear(&ctx, sizeof(ctx));
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gmssl_secure_clear(outbuf, sizeof(outbuf));
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gmssl_secure_clear(block, sizeof(block));
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gmssl_secure_clear(buf, sizeof(buf));
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if (infile && infp) fclose(infp);
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if (outfile && outfp) fclose(outfp);
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return ret;
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}
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