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This commit is contained in:
Zhi Guan
2026-06-26 18:06:53 +08:00
parent e43f9e306d
commit a77feb2b4c
25 changed files with 256 additions and 217 deletions
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93
tools/sm4_cbc.c
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@@ -18,7 +18,7 @@
#include <gmssl/error.h>
static const char *usage = "{-encrypt|-decrypt} -key hex -iv hex [-in file] [-out file]";
static const char *usage = "{-encrypt|-decrypt} -key hex -iv hex [-pkcs7_padding] [-in file] [-out file]";
static const char *options =
"\n"
@@ -28,16 +28,20 @@ static const char *options =
" -decrypt Decrypt\n"
" -key hex Symmetric key in HEX format\n"
" -iv hex IV in HEX format\n"
" -in file | stdin Input data\n"
" -pkcs7_padding Enable PKCS#7 padding\n"
" Encrypt input can be any byte length; decrypt input must be a multiple of 16 bytes\n"
" -in file | stdin Input data. Without `-pkcs7_padding`, input length must be a multiple of 16 bytes\n"
" -out file | stdout Output data\n"
"\n"
"Examples\n"
"\n"
" $ TEXT=`gmssl rand -outlen 20 -hex`\n"
" $ KEY=`gmssl rand -outlen 16 -hex`\n"
" $ IV=`gmssl rand -outlen 16 -hex`\n"
" $ echo -n $TEXT | gmssl sm4_cbc -encrypt -key $KEY -iv $IV -out sm4_cbc_ciphertext.bin\n"
" $ gmssl sm4_cbc -decrypt -key $KEY -iv $IV -in sm4_cbc_ciphertext.bin\n"
" KEY=`gmssl rand -outlen 16 -hex`\n"
" IV=`gmssl rand -outlen 16 -hex`\n"
" echo -n 0123456789abcdef | gmssl sm4_cbc -encrypt -key $KEY -iv $IV -out sm4_cbc_ciphertext.bin\n"
" gmssl sm4_cbc -decrypt -key $KEY -iv $IV -in sm4_cbc_ciphertext.bin\n"
"\n"
" echo -n abc | gmssl sm4_cbc -encrypt -pkcs7_padding -key $KEY -iv $IV -out sm4_cbc_ciphertext.bin\n"
" gmssl sm4_cbc -decrypt -pkcs7_padding -key $KEY -iv $IV -in sm4_cbc_ciphertext.bin\n"
"\n";
int sm4_cbc_main(int argc, char **argv)
@@ -49,16 +53,25 @@ int sm4_cbc_main(int argc, char **argv)
char *ivhex = NULL;
char *infile = NULL;
char *outfile = NULL;
int pkcs7_padding = 0;
uint8_t key[16];
size_t keylen;
uint8_t iv[16];
size_t ivlen;
FILE *infp = stdin;
FILE *outfp = stdout;
SM4_KEY sm4_key;
SM4_CBC_CTX ctx;
uint8_t buf[4096];
uint8_t outbuf[4096];
uint8_t block[16];
size_t block_nbytes = 0;
size_t inlen;
size_t outlen;
size_t nblocks;
size_t len;
size_t left;
size_t inpos;
argc--;
argv++;
@@ -108,6 +121,8 @@ int sm4_cbc_main(int argc, char **argv)
fprintf(stderr, "gmssl %s: invalid IV hex digits\n", prog);
goto end;
}
} else if (!strcmp(*argv, "-pkcs7_padding")) {
pkcs7_padding = 1;
} else if (!strcmp(*argv, "-in")) {
if (--argc < 1) goto bad;
infile = *(++argv);
@@ -147,33 +162,74 @@ bad:
goto end;
}
if (enc) {
if (pkcs7_padding && enc) {
if (sm4_cbc_encrypt_init(&ctx, key, iv) != 1) {
error_print();
goto end;
}
} else {
} else if (pkcs7_padding) {
if (sm4_cbc_decrypt_init(&ctx, key, iv) != 1) {
error_print();
goto end;
}
} else if (enc) {
sm4_set_encrypt_key(&sm4_key, key);
} else {
sm4_set_decrypt_key(&sm4_key, key);
}
while ((inlen = fread(buf, 1, sizeof(buf), infp)) > 0) {
if (enc) {
if (pkcs7_padding && enc) {
if (sm4_cbc_encrypt_update(&ctx, buf, inlen, buf, &outlen) != 1) {
error_print();
goto end;
}
} else {
} else if (pkcs7_padding) {
if (sm4_cbc_decrypt_update(&ctx, buf, inlen, buf, &outlen) != 1) {
error_print();
goto end;
}
} else {
outlen = 0;
inpos = 0;
if (block_nbytes) {
left = sizeof(block) - block_nbytes;
if (inlen < left) {
memcpy(block + block_nbytes, buf, inlen);
block_nbytes += inlen;
continue;
}
memcpy(block + block_nbytes, buf, left);
if (enc) {
sm4_cbc_encrypt_blocks(&sm4_key, iv, block, 1, outbuf);
} else {
sm4_cbc_decrypt_blocks(&sm4_key, iv, block, 1, outbuf);
}
outlen = sizeof(block);
inpos = left;
block_nbytes = 0;
}
nblocks = (inlen - inpos) / sizeof(block);
len = nblocks * sizeof(block);
if (len) {
if (enc) {
sm4_cbc_encrypt_blocks(&sm4_key, iv, buf + inpos, nblocks, outbuf + outlen);
} else {
sm4_cbc_decrypt_blocks(&sm4_key, iv, buf + inpos, nblocks, outbuf + outlen);
}
outlen += len;
inpos += len;
}
if (inlen > inpos) {
block_nbytes = inlen - inpos;
memcpy(block, buf + inpos, block_nbytes);
}
}
if (fwrite(buf, 1, outlen, outfp) != outlen) {
if (fwrite(pkcs7_padding ? buf : outbuf, 1, outlen, outfp) != outlen) {
fprintf(stderr, "gmssl %s: output failure : %s\n", prog, strerror(errno));
goto end;
}
@@ -183,16 +239,22 @@ bad:
goto end;
}
if (enc) {
if (pkcs7_padding && enc) {
if (sm4_cbc_encrypt_finish(&ctx, buf, &outlen) != 1) {
error_print();
goto end;
}
} else {
} else if (pkcs7_padding) {
if (sm4_cbc_decrypt_finish(&ctx, buf, &outlen) != 1) {
error_print();
goto end;
}
} else {
if (block_nbytes) {
fprintf(stderr, "gmssl %s: input length must be multiple of 16 bytes when PKCS#7 padding is not enabled\n", prog);
goto end;
}
outlen = 0;
}
if (fwrite(buf, 1, outlen, outfp) != outlen) {
fprintf(stderr, "gmssl %s: output failure : %s\n", prog, strerror(errno));
@@ -204,7 +266,10 @@ bad:
end:
gmssl_secure_clear(key, sizeof(key));
gmssl_secure_clear(iv, sizeof(iv));
gmssl_secure_clear(&sm4_key, sizeof(sm4_key));
gmssl_secure_clear(&ctx, sizeof(ctx));
gmssl_secure_clear(outbuf, sizeof(outbuf));
gmssl_secure_clear(block, sizeof(block));
gmssl_secure_clear(buf, sizeof(buf));
if (infile && infp) fclose(infp);
if (outfile && outfp) fclose(outfp);