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Make AES-CMAC context slightly smaller.

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Since AES-CMAC is based on AES-128, the state specific to AES-CMAC can overlap the latter parts of the AES context structure, which are used only by AES-192 or AES-256.
This commit is contained in:
Stephen Heumann 2024-06-26 21:43:49 -06:00
parent 6a1eeb40ea
commit e1ea84f11a
1 changed files with 9 additions and 4 deletions
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13
aes.h
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@ -1,5 +1,5 @@
/* /*
* Copyright (c) 2017 Stephen Heumann * Copyright (c) 2017,2024 Stephen Heumann
* *
* Permission to use, copy, modify, and/or distribute this software for any * Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above * purpose with or without fee is hereby granted, provided that the above
@ -22,9 +22,14 @@ struct aes_context {
}; };
struct aes_cmac_context { struct aes_cmac_context {
struct aes_context ctx; union {
unsigned char k1[16]; struct aes_context ctx;
unsigned char k2[16]; struct {
unsigned char padding[16+17+32+16*9];
unsigned char k1[16];
unsigned char k2[16];
};
};
}; };
/* /*