tor-browser

The Tor Browser
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rijndael.h (2543B)

      1 /* This Source Code Form is subject to the terms of the Mozilla Public
      2 * License, v. 2.0. If a copy of the MPL was not distributed with this
      3 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
      4 
      5 #ifndef _RIJNDAEL_H_
      6 #define _RIJNDAEL_H_ 1
      7 
      8 #include "blapii.h"
      9 #include <stdint.h>
     10 
     11 #if defined(NSS_X86_OR_X64)
     12 /* GCC <= 4.8 doesn't support including emmintrin.h without enabling SSE2 */
     13 #if !defined(__clang__) && defined(__GNUC__) && defined(__GNUC_MINOR__) && \
     14    (__GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ <= 8))
     15 #pragma GCC push_options
     16 #pragma GCC target("sse2")
     17 #undef NSS_DISABLE_SSE2
     18 #define NSS_DISABLE_SSE2 1
     19 #endif /* GCC <= 4.8 */
     20 
     21 #include <emmintrin.h> /* __m128i */
     22 
     23 #ifdef NSS_DISABLE_SSE2
     24 #undef NSS_DISABLE_SSE2
     25 #pragma GCC pop_options
     26 #endif /* NSS_DISABLE_SSE2 */
     27 #endif
     28 
     29 /* RIJNDAEL_NUM_ROUNDS
     30 *
     31 * Number of rounds per execution
     32 * Nk - number of key bytes
     33 * Nb - blocksize (in bytes)
     34 */
     35 #define RIJNDAEL_NUM_ROUNDS(Nk, Nb) \
     36    (PR_MAX(Nk, Nb) + 6)
     37 
     38 /*
     39 * This magic number is (Nb_max * (Nr_max + 1))
     40 * where Nb_max is the maximum block size in 32-bit words,
     41 *       Nr_max is the maximum number of rounds, which is Nb_max + 6
     42 */
     43 #define RIJNDAEL_MAX_EXP_KEY_SIZE (4 * 15)
     44 
     45 /* AESContextStr
     46 *
     47 * Values which maintain the state for Rijndael encryption/decryption.
     48 *
     49 * keySchedule - 128-bit registers for the key-schedule
     50 * iv          - initialization vector for CBC mode
     51 * Nb          - the number of bytes in a block, specified by user
     52 * Nr          - the number of rounds, specified by a table
     53 * expandedKey - the round keys in 4-byte words, the length is Nr * Nb
     54 * worker      - the encryption/decryption function to use with worker_cx
     55 * destroy     - if not NULL, the destroy function to use with worker_cx
     56 * worker_cx   - the context for worker and destroy
     57 * isBlock     - is the mode of operation a block cipher or a stream cipher?
     58 */
     59 struct AESContextStr {
     60    /* NOTE: Offsets to members in this struct are hardcoded in assembly.
     61     * Don't change the struct without updating intel-aes.s and intel-gcm.s. */
     62    union {
     63 #if defined(NSS_X86_OR_X64)
     64        __m128i keySchedule[15];
     65 #endif
     66        PRUint32 expandedKey[RIJNDAEL_MAX_EXP_KEY_SIZE];
     67    } k;
     68    unsigned int Nb;
     69    unsigned int Nr;
     70    freeblCipherFunc worker;
     71    unsigned char iv[AES_BLOCK_SIZE];
     72    freeblAeadFunc worker_aead;
     73    freeblDestroyFunc destroy;
     74    void *worker_cx;
     75    PRBool isBlock;
     76    int mode;
     77    void *mem; /* Start of the allocated memory to free. */
     78 };
     79 
     80 #endif /* _RIJNDAEL_H_ */