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AES GCM depends on CTR

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This commit is contained in:
Zhi Guan
2024-04-12 10:27:08 +08:00
parent 8c1c69e264
commit 9fd4464980
3 changed files with 9 additions and 76 deletions
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31
src/aes_modes.c
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@@ -1,5 +1,5 @@
/*
* Copyright 2014-2022 The GmSSL Project. All Rights Reserved.
* Copyright 2014-2024 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.
@@ -13,9 +13,9 @@
#include <string.h>
#include <stdlib.h>
#include <gmssl/aes.h>
#include <gmssl/gcm.h>
#include <gmssl/error.h>
#include <gmssl/mem.h>
#include <gmssl/ghash.h>
#include <gmssl/error.h>
void aes_cbc_encrypt(const AES_KEY *key, const uint8_t iv[16],
@@ -149,16 +149,8 @@ int aes_gcm_encrypt(const AES_KEY *key, const uint8_t *iv, size_t ivlen,
aes_encrypt(key, Y, T);
while (left) {
uint8_t block[16];
size_t len = left < 16 ? left : 16;
ctr_incr(Y);
aes_encrypt(key, Y, block);
gmssl_memxor(pout, pin, block, len);
pin += len;
pout += len;
left -= len;
}
ctr_incr(Y);
aes_ctr_encrypt(key, Y, in, inlen, out);
ghash(H, aad, aadlen, out, inlen, H);
gmssl_memxor(tag, T, H, taglen);
@@ -194,15 +186,8 @@ int aes_gcm_decrypt(const AES_KEY *key, const uint8_t *iv, size_t ivlen,
return -1;
}
while (left) {
uint8_t block[16];
size_t len = left < 16 ? left : 16;
ctr_incr(Y);
aes_encrypt(key, Y, block);
gmssl_memxor(pout, pin, block, len);
pin += len;
pout += len;
left -= len;
}
ctr_incr(Y);
aes_ctr_encrypt(key, Y, in, inlen, out);
return 1;
}