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Fix sm4_cbc_padding_decrypt bug

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This commit is contained in:
Zhi Guan
2026-06-01 15:16:24 +08:00
parent 0dd8d64dec
commit 57c9433cc9
1 changed files with 9 additions and 1 deletions
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10
src/sm4_cbc.c
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@@ -1,5 +1,5 @@
/*
* Copyright 2014-2024 The GmSSL Project. All Rights Reserved.
* Copyright 2014-2026 The GmSSL Project. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the License); you may
* not use this file except in compliance with the License.
@@ -46,6 +46,7 @@ int sm4_cbc_padding_decrypt(const SM4_KEY *key, const uint8_t piv[16],
uint8_t block[16];
size_t len = sizeof(block);
int padding;
int i;
memcpy(iv, piv, 16);
@@ -68,6 +69,13 @@ int sm4_cbc_padding_decrypt(const SM4_KEY *key, const uint8_t piv[16],
error_print();
return -1;
}
for (i = 16 - padding; i < 16; i++) {
if (block[i] != padding) {
error_print();
return -1;
}
}
len -= padding;
memcpy(out + inlen - 16, block, len);
*outlen = inlen - padding;