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usr / src / contrib / wpa / src / crypto /

📁 ..
📄 aes-cbc.c(1.93 KB)
📄 aes-ccm.c(4.92 KB)
📄 aes-ctr.c(1.64 KB)
📄 aes-eax.c(3.24 KB)
📄 aes-encblock.c(704 B)
📄 aes-gcm.c(6.47 KB)
📄 aes-internal-dec.c(3.64 KB)
📄 aes-internal-enc.c(2.66 KB)
📄 aes-internal.c(41.23 KB)
📄 aes-omac1.c(4.46 KB)
📄 aes-siv.c(4.06 KB)
📄 aes-unwrap.c(1.78 KB)
📄 aes-wrap.c(1.62 KB)
📄 aes.h(548 B)
📄 aes_i.h(4.16 KB)
📄 aes_siv.h(565 B)
📄 aes_wrap.h(2.91 KB)
📄 crypto.h(28.61 KB)
📄 crypto_gnutls.c(11.42 KB)
📄 crypto_internal-cipher.c(5.08 KB)
📄 crypto_internal-modexp.c(2.95 KB)
📄 crypto_internal-rsa.c(2.81 KB)
📄 crypto_internal.c(6.84 KB)
📄 crypto_libtomcrypt.c(15.07 KB)
📄 crypto_linux.c(21.77 KB)
📄 crypto_module_tests.c(61.19 KB)
📄 crypto_nettle.c(9.7 KB)
📄 crypto_none.c(461 B)
📄 crypto_openssl.c(44.34 KB)
📄 crypto_wolfssl.c(33.91 KB)
📄 des-internal.c(14.83 KB)
📄 des_i.h(709 B)
📄 dh_group5.c(806 B)
📄 dh_group5.h(556 B)
📄 dh_groups.c(54.26 KB)
📄 dh_groups.h(692 B)
📄 fips_prf_internal.c(1.37 KB)
📄 fips_prf_openssl.c(2.05 KB)
📄 fips_prf_wolfssl.c(1.75 KB)
📄 md4-internal.c(7.91 KB)
📄 md5-internal.c(8.79 KB)
📄 md5.c(2.64 KB)
📄 md5.h(505 B)
📄 md5_i.h(516 B)
📄 milenage.c(9.5 KB)
📄 milenage.h(1019 B)
📄 ms_funcs.c(16.16 KB)
📄 ms_funcs.h(2.41 KB)
📄 random.c(11.66 KB)
📄 random.h(855 B)
📄 rc4.c(1009 B)
📄 sha1-internal.c(8.93 KB)
📄 sha1-pbkdf2.c(2.34 KB)
📄 sha1-prf.c(1.58 KB)
📄 sha1-tlsprf.c(2.69 KB)
📄 sha1-tprf.c(1.75 KB)
📄 sha1.c(2.69 KB)
📄 sha1.h(1.03 KB)
📄 sha1_i.h(590 B)
📄 sha256-internal.c(6 KB)
📄 sha256-kdf.c(2.08 KB)
📄 sha256-prf.c(2.84 KB)
📄 sha256-tlsprf.c(1.81 KB)
📄 sha256.c(2.64 KB)
📄 sha256.h(1.07 KB)
📄 sha256_i.h(584 B)
📄 sha384-internal.c(2.17 KB)
📄 sha384-kdf.c(2.08 KB)
📄 sha384-prf.c(2.85 KB)
📄 sha384.c(2.63 KB)
📄 sha384.h(949 B)
📄 sha384_i.h(573 B)
📄 sha512-internal.c(7.71 KB)
📄 sha512-kdf.c(2.08 KB)
📄 sha512-prf.c(2.85 KB)
📄 sha512.c(2.63 KB)
📄 sha512.h(949 B)
📄 sha512_i.h(591 B)
📄 tls.h(23.71 KB)
📄 tls_gnutls.c(44.97 KB)
📄 tls_internal.c(18.93 KB)
📄 tls_none.c(3.9 KB)
📄 tls_openssl.c(137.99 KB)
📄 tls_openssl.h(477 B)
📄 tls_openssl_ocsp.c(20.52 KB)
📄 tls_wolfssl.c(51.88 KB)

Editing: aes-internal-dec.c

/*
 * AES (Rijndael) cipher - decrypt
 *
 * Modifications to public domain implementation:
 * - 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) 2003-2012, Jouni Malinen <j@w1.fi>
 *
 * This software may be distributed under the terms of the BSD license.
 * See README for more details.
 */

#include "includes.h"

#include "common.h"
#include "crypto.h"
#include "aes_i.h"

/**
 * Expand the cipher key into the decryption key schedule.
 *
 * @return	the number of rounds for the given cipher key size.
 */
static int rijndaelKeySetupDec(u32 rk[], const u8 cipherKey[], int keyBits)
{
	int Nr, i, j;
	u32 temp;

/* expand the cipher key: */
	Nr = rijndaelKeySetupEnc(rk, cipherKey, keyBits);
	if (Nr < 0)
		return Nr;
	/* invert the order of the round keys: */
	for (i = 0, j = 4*Nr; i < j; i += 4, j -= 4) {
		temp = rk[i    ]; rk[i    ] = rk[j    ]; rk[j    ] = temp;
		temp = rk[i + 1]; rk[i + 1] = rk[j + 1]; rk[j + 1] = temp;
		temp = rk[i + 2]; rk[i + 2] = rk[j + 2]; rk[j + 2] = temp;
		temp = rk[i + 3]; rk[i + 3] = rk[j + 3]; rk[j + 3] = temp;
	}
	/* apply the inverse MixColumn transform to all round keys but the
	 * first and the last: */
	for (i = 1; i < Nr; i++) {
		rk += 4;
		for (j = 0; j < 4; j++) {
			rk[j] = TD0_(TE4((rk[j] >> 24)       )) ^
				TD1_(TE4((rk[j] >> 16) & 0xff)) ^
				TD2_(TE4((rk[j] >>  8) & 0xff)) ^
				TD3_(TE4((rk[j]      ) & 0xff));
		}
	}

return Nr;
}

void * aes_decrypt_init(const u8 *key, size_t len)
{
	u32 *rk;
	int res;
	rk = os_malloc(AES_PRIV_SIZE);
	if (rk == NULL)
		return NULL;
	res = rijndaelKeySetupDec(rk, key, len * 8);
	if (res < 0) {
		os_free(rk);
		return NULL;
	}
	rk[AES_PRIV_NR_POS] = res;
	return rk;
}

static void rijndaelDecrypt(const u32 rk[/*44*/], int Nr, const u8 ct[16],
			    u8 pt[16])
{
	u32 s0, s1, s2, s3, t0, t1, t2, t3;
#ifndef FULL_UNROLL
	int r;
#endif /* ?FULL_UNROLL */

/*
	 * map byte array block to cipher state
	 * and add initial round key:
	 */
	s0 = GETU32(ct     ) ^ rk[0];
	s1 = GETU32(ct +  4) ^ rk[1];
	s2 = GETU32(ct +  8) ^ rk[2];
	s3 = GETU32(ct + 12) ^ rk[3];

#define ROUND(i,d,s) \
d##0 = TD0(s##0) ^ TD1(s##3) ^ TD2(s##2) ^ TD3(s##1) ^ rk[4 * i]; \
d##1 = TD0(s##1) ^ TD1(s##0) ^ TD2(s##3) ^ TD3(s##2) ^ rk[4 * i + 1]; \
d##2 = TD0(s##2) ^ TD1(s##1) ^ TD2(s##0) ^ TD3(s##3) ^ rk[4 * i + 2]; \
d##3 = TD0(s##3) ^ TD1(s##2) ^ TD2(s##1) ^ TD3(s##0) ^ 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);
	if (Nr > 10) {
		ROUND(10,s,t);
		ROUND(11,t,s);
		if (Nr > 12) {
			ROUND(12,s,t);
			ROUND(13,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 = TD41(t0) ^ TD42(t3) ^ TD43(t2) ^ TD44(t1) ^ rk[0];
	PUTU32(pt     , s0);
	s1 = TD41(t1) ^ TD42(t0) ^ TD43(t3) ^ TD44(t2) ^ rk[1];
	PUTU32(pt +  4, s1);
	s2 = TD41(t2) ^ TD42(t1) ^ TD43(t0) ^ TD44(t3) ^ rk[2];
	PUTU32(pt +  8, s2);
	s3 = TD41(t3) ^ TD42(t2) ^ TD43(t1) ^ TD44(t0) ^ rk[3];
	PUTU32(pt + 12, s3);
}

int aes_decrypt(void *ctx, const u8 *crypt, u8 *plain)
{
	u32 *rk = ctx;
	rijndaelDecrypt(ctx, rk[AES_PRIV_NR_POS], crypt, plain);
	return 0;
}

void aes_decrypt_deinit(void *ctx)
{
	os_memset(ctx, 0, AES_PRIV_SIZE);
	os_free(ctx);
}

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Editing: aes-internal-dec.c

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