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Crypto build cleanup: remove CONFIG_NO_AES_ENCRYPT

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Instead of using a define and conditional building of AES parts,
move the AES encryption routines into a separate file.
This commit is contained in:
Johannes Berg 2009-08-13 11:21:32 +03:00 committed by Jouni Malinen
parent 381fcbc9f4
commit 27da6d4a0e
5 changed files with 127 additions and 97 deletions
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2
eap_example/Makefile
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@ -40,7 +40,7 @@ OBJS_both += ../src/crypto/ms_funcs.o
ifeq ($(CONFIG_TLS), internal)
OBJS_both += ../src/crypto/sha1-internal.o
OBJS_both += ../src/crypto/des-internal.o
OBJS_both += ../src/crypto/aes-internal.o ../src/crypto/aes-internal-dec.o
OBJS_both += ../src/crypto/aes-internal.o ../src/crypto/aes-internal-dec.o ../src/crypto/aes-internal-enc.o
endif
SHA256OBJS = ../src/crypto/sha256.o

2
hostapd/Makefile
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@ -539,7 +539,7 @@ CONFIG_INTERNAL_SHA256=y
endif
ifdef CONFIG_INTERNAL_AES
AESOBJS += ../src/crypto/aes-internal.o
AESOBJS += ../src/crypto/aes-internal.o ../src/crypto/aes-internal-enc.o
endif
ifdef CONFIG_INTERNAL_SHA1
SHA1OBJS += ../src/crypto/sha1-internal.o

121
src/crypto/aes-internal-enc.c Normal file
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@ -0,0 +1,121 @@
/*
* AES (Rijndael) cipher - encrypt
*
* Modifications to public domain implementation:
* - support only 128-bit keys
* - cleanup
* - use C pre-processor to make it easier to change S table access
* - added option (AES_SMALL_TABLES) for reducing code size by about 8 kB at
* cost of reduced throughput (quite small difference on Pentium 4,
* 10-25% when using -O1 or -O2 optimization)
*
* Copyright (c) 2003-2005, Jouni Malinen <j@w1.fi>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* Alternatively, this software may be distributed under the terms of BSD
* license.
*
* See README and COPYING for more details.
*/
#include "includes.h"
#include "common.h"
#include "crypto.h"
#include "aes_i.h"
void rijndaelEncrypt(const u32 rk[/*44*/], const u8 pt[16], u8 ct[16])
{
u32 s0, s1, s2, s3, t0, t1, t2, t3;
const int Nr = 10;
#ifndef FULL_UNROLL
int r;
#endif /* ?FULL_UNROLL */
/*
* map byte array block to cipher state
* and add initial round key:
*/
s0 = GETU32(pt ) ^ rk[0];
s1 = GETU32(pt + 4) ^ rk[1];
s2 = GETU32(pt + 8) ^ rk[2];
s3 = GETU32(pt + 12) ^ rk[3];
#define ROUND(i,d,s) \
d##0 = TE0(s##0) ^ TE1(s##1) ^ TE2(s##2) ^ TE3(s##3) ^ rk[4 * i]; \
d##1 = TE0(s##1) ^ TE1(s##2) ^ TE2(s##3) ^ TE3(s##0) ^ rk[4 * i + 1]; \
d##2 = TE0(s##2) ^ TE1(s##3) ^ TE2(s##0) ^ TE3(s##1) ^ rk[4 * i + 2]; \
d##3 = TE0(s##3) ^ TE1(s##0) ^ TE2(s##1) ^ TE3(s##2) ^ rk[4 * i + 3]
#ifdef FULL_UNROLL
ROUND(1,t,s);
ROUND(2,s,t);
ROUND(3,t,s);
ROUND(4,s,t);
ROUND(5,t,s);
ROUND(6,s,t);
ROUND(7,t,s);
ROUND(8,s,t);
ROUND(9,t,s);
rk += Nr << 2;
#else /* !FULL_UNROLL */
/* Nr - 1 full rounds: */
r = Nr >> 1;
for (;;) {
ROUND(1,t,s);
rk += 8;
if (--r == 0)
break;
ROUND(0,s,t);
}
#endif /* ?FULL_UNROLL */
#undef ROUND
/*
* apply last round and
* map cipher state to byte array block:
*/
s0 = TE41(t0) ^ TE42(t1) ^ TE43(t2) ^ TE44(t3) ^ rk[0];
PUTU32(ct , s0);
s1 = TE41(t1) ^ TE42(t2) ^ TE43(t3) ^ TE44(t0) ^ rk[1];
PUTU32(ct + 4, s1);
s2 = TE41(t2) ^ TE42(t3) ^ TE43(t0) ^ TE44(t1) ^ rk[2];
PUTU32(ct + 8, s2);
s3 = TE41(t3) ^ TE42(t0) ^ TE43(t1) ^ TE44(t2) ^ rk[3];
PUTU32(ct + 12, s3);
}
void * aes_encrypt_init(const u8 *key, size_t len)
{
u32 *rk;
if (len != 16)
return NULL;
rk = os_malloc(AES_PRIV_SIZE);
if (rk == NULL)
return NULL;
rijndaelKeySetupEnc(rk, key);
return rk;
}
void aes_encrypt(void *ctx, const u8 *plain, u8 *crypt)
{
rijndaelEncrypt(ctx, plain, crypt);
}
void aes_encrypt_deinit(void *ctx)
{
os_memset(ctx, 0, AES_PRIV_SIZE);
os_free(ctx);
}

94
src/crypto/aes-internal.c
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@ -803,97 +803,3 @@ void rijndaelKeySetupEnc(u32 rk[/*44*/], const u8 cipherKey[])
rk += 4;
}
}
#ifndef CONFIG_NO_AES_ENCRYPT
void rijndaelEncrypt(const u32 rk[/*44*/], const u8 pt[16], u8 ct[16])
{
u32 s0, s1, s2, s3, t0, t1, t2, t3;
const int Nr = 10;
#ifndef FULL_UNROLL
int r;
#endif /* ?FULL_UNROLL */
/*
* map byte array block to cipher state
* and add initial round key:
*/
s0 = GETU32(pt ) ^ rk[0];
s1 = GETU32(pt + 4) ^ rk[1];
s2 = GETU32(pt + 8) ^ rk[2];
s3 = GETU32(pt + 12) ^ rk[3];
#define ROUND(i,d,s) \
d##0 = TE0(s##0) ^ TE1(s##1) ^ TE2(s##2) ^ TE3(s##3) ^ rk[4 * i]; \
d##1 = TE0(s##1) ^ TE1(s##2) ^ TE2(s##3) ^ TE3(s##0) ^ rk[4 * i + 1]; \
d##2 = TE0(s##2) ^ TE1(s##3) ^ TE2(s##0) ^ TE3(s##1) ^ rk[4 * i + 2]; \
d##3 = TE0(s##3) ^ TE1(s##0) ^ TE2(s##1) ^ TE3(s##2) ^ rk[4 * i + 3]
#ifdef FULL_UNROLL
ROUND(1,t,s);
ROUND(2,s,t);
ROUND(3,t,s);
ROUND(4,s,t);
ROUND(5,t,s);
ROUND(6,s,t);
ROUND(7,t,s);
ROUND(8,s,t);
ROUND(9,t,s);
rk += Nr << 2;
#else /* !FULL_UNROLL */
/* Nr - 1 full rounds: */
r = Nr >> 1;
for (;;) {
ROUND(1,t,s);
rk += 8;
if (--r == 0)
break;
ROUND(0,s,t);
}
#endif /* ?FULL_UNROLL */
#undef ROUND
/*
* apply last round and
* map cipher state to byte array block:
*/
s0 = TE41(t0) ^ TE42(t1) ^ TE43(t2) ^ TE44(t3) ^ rk[0];
PUTU32(ct , s0);
s1 = TE41(t1) ^ TE42(t2) ^ TE43(t3) ^ TE44(t0) ^ rk[1];
PUTU32(ct + 4, s1);
s2 = TE41(t2) ^ TE42(t3) ^ TE43(t0) ^ TE44(t1) ^ rk[2];
PUTU32(ct + 8, s2);
s3 = TE41(t3) ^ TE42(t0) ^ TE43(t1) ^ TE44(t2) ^ rk[3];
PUTU32(ct + 12, s3);
}
void * aes_encrypt_init(const u8 *key, size_t len)
{
u32 *rk;
if (len != 16)
return NULL;
rk = os_malloc(AES_PRIV_SIZE);
if (rk == NULL)
return NULL;
rijndaelKeySetupEnc(rk, key);
return rk;
}
void aes_encrypt(void *ctx, const u8 *plain, u8 *crypt)
{
rijndaelEncrypt(ctx, plain, crypt);
}
void aes_encrypt_deinit(void *ctx)
{
os_memset(ctx, 0, AES_PRIV_SIZE);
os_free(ctx);
}
#endif /* CONFIG_NO_AES_ENCRYPT */

5
wpa_supplicant/Makefile
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@ -1074,8 +1074,11 @@ ifdef CONFIG_NO_AES_EXTRAS
CFLAGS += -DCONFIG_NO_AES_WRAP
CFLAGS += -DCONFIG_NO_AES_CTR -DCONFIG_NO_AES_OMAC1
CFLAGS += -DCONFIG_NO_AES_EAX -DCONFIG_NO_AES_CBC
CFLAGS += -DCONFIG_NO_AES_ENCRYPT
CFLAGS += -DCONFIG_NO_AES_ENCRYPT_BLOCK
else
ifdef CONFIG_INTERNAL_AES
AESOBJS += ../src/crypto/aes-internal-enc.o
endif
endif
ifdef NEED_AES