C++ zeromem函数代码示例

static HWND findMDIParentOf (HWND w)
{
    const int frameThickness = GetSystemMetrics (SM_CYFIXEDFRAME);

    while (w != 0)
    {
        HWND parent = GetParent (w);

        if (parent == 0)
            break;

        TCHAR windowType [32];
        zeromem (windowType, sizeof (windowType));
        GetClassName (parent, windowType, 31);

        if (String (windowType).equalsIgnoreCase (T("MDIClient")))
        {
            w = parent;
            break;
        }

        RECT windowPos;
        GetWindowRect (w, &windowPos);

        RECT parentPos;
        GetWindowRect (parent, &parentPos);

        int dw = (parentPos.right - parentPos.left) - (windowPos.right - windowPos.left);
        int dh = (parentPos.bottom - parentPos.top) - (windowPos.bottom - windowPos.top);

        if (dw > 100 || dh > 100)
            break;

        w = parent;

        if (dw == 2 * frameThickness)
            break;
    }

    return w;
}

/** 
  Hash data from an open file handle.  
  @param hash   The index of the hash you want to use
  @param in     The FILE* handle of the file you want to hash
  @param out    [out] The destination of the digest
  @param outlen [in/out] The max size and resulting size of the digest
  @result CRYPT_OK if successful   
*/
int hash_filehandle(int hash, FILE *in, unsigned char *out, unsigned long *outlen)
{
#ifdef LTC_NO_FILE
    return CRYPT_NOP;
#else
    hash_state md;
    unsigned char buf[512];
    size_t x;
    int err;

    LTC_ARGCHK(out    != NULL);
    LTC_ARGCHK(outlen != NULL);
    LTC_ARGCHK(in     != NULL);

    if ((err = hash_is_valid(hash)) != CRYPT_OK) {
        return err;
    }

    if (*outlen < hash_descriptor[hash].hashsize) {
       *outlen = hash_descriptor[hash].hashsize;
       return CRYPT_BUFFER_OVERFLOW;
    }
    if ((err = hash_descriptor[hash].init(&md)) != CRYPT_OK) {
       return err;
    }

    *outlen = hash_descriptor[hash].hashsize;
    do {
        x = fread(buf, 1, sizeof(buf), in);
        if ((err = hash_descriptor[hash].process(&md, buf, x)) != CRYPT_OK) {
           return err;
        }
    } while (x == sizeof(buf));
    err = hash_descriptor[hash].done(&md, out);

#ifdef LTC_CLEAN_STACK
    zeromem(buf, sizeof(buf));
#endif
    return err;
#endif
}

/**
   EAX encrypt and produce an authentication tag
   @param cipher     The index of the cipher desired
   @param key        The secret key to use
   @param keylen     The length of the secret key (octets)
   @param nonce      The session nonce [use once]
   @param noncelen   The length of the nonce
   @param header     The header for the session
   @param headerlen  The length of the header (octets)
   @param pt         The plaintext
   @param ptlen      The length of the plaintext (octets)
   @param ct         [out] The ciphertext
   @param tag        [out] The destination tag
   @param taglen     [in/out] The max size and resulting size of the authentication tag
   @return CRYPT_OK if successful
*/
int eax_encrypt_authenticate_memory(int cipher,
    const unsigned char *key,    unsigned long keylen,
    const unsigned char *nonce,  unsigned long noncelen,
    const unsigned char *header, unsigned long headerlen,
    const unsigned char *pt,     unsigned long ptlen,
          unsigned char *ct,
          unsigned char *tag,    unsigned long *taglen)
{
   int err;
   eax_state *eax;

   LTC_ARGCHK(key    != NULL);
   LTC_ARGCHK(pt     != NULL);
   LTC_ARGCHK(ct     != NULL);
   LTC_ARGCHK(tag    != NULL);
   LTC_ARGCHK(taglen != NULL);

   eax = XMALLOC(sizeof(*eax));

   if ((err = eax_init(eax, cipher, key, keylen, nonce, noncelen, header, headerlen)) != CRYPT_OK) {
      goto LBL_ERR; 
   }

   if ((err = eax_encrypt(eax, pt, ct, ptlen)) != CRYPT_OK) {
      goto LBL_ERR; 
   }
 
   if ((err = eax_done(eax, tag, taglen)) != CRYPT_OK) {
      goto LBL_ERR; 
   }

   err = CRYPT_OK;
LBL_ERR:
#ifdef LTC_CLEAN_STACK
   zeromem(eax, sizeof(*eax));
#endif

   XFREE(eax);

   return err;   
}

/**
   HMAC a block of memory to produce the authentication tag
   @param hash      The index of the hash to use 
   @param key       The secret key 
   @param keylen    The length of the secret key (octets)
   @param in        The data to HMAC
   @param inlen     The length of the data to HMAC (octets)
   @param out       [out] Destination of the authentication tag
   @param outlen    [in/out] Max size and resulting size of authentication tag
   @return CRYPT_OK if successful
*/
int hmac_memory(int hash, 
                const unsigned char *key,  unsigned long keylen,
                const unsigned char *in,   unsigned long inlen, 
                      unsigned char *out,  unsigned long *outlen)
{
    hmac_state *hmac;
    int err;

    LTC_ARGCHK(key    != NULL);
    LTC_ARGCHK(in   != NULL);
    LTC_ARGCHK(out    != NULL); 
    LTC_ARGCHK(outlen != NULL);

    /* allocate ram for hmac state */
    hmac = XMALLOC(sizeof(hmac_state));
    if (hmac == NULL) {
       return CRYPT_MEM;
    }

    if ((err = hmac_init(hmac, hash, key, keylen)) != CRYPT_OK) {
       goto LBL_ERR;
    }

    if ((err = hmac_process(hmac, in, inlen)) != CRYPT_OK) {
       goto LBL_ERR;
    }

    if ((err = hmac_done(hmac, out, outlen)) != CRYPT_OK) {
       goto LBL_ERR;
    }

   err = CRYPT_OK;
LBL_ERR:
#ifdef LTC_CLEAN_STACK
   zeromem(hmac, sizeof(hmac_state));
#endif

   XFREE(hmac);
   return err;   
}

int Compression::compress(uint8_t *p_dst, const uint8_t *p_src, int p_src_size,Mode p_mode) {

	switch(p_mode) {
		case MODE_FASTLZ: {

			if (p_src_size<16) {
				uint8_t src[16];
				zeromem(&src[p_src_size],16-p_src_size);
				copymem(src,p_src,p_src_size);
				return fastlz_compress(src,16,p_dst);
			} else {
				return fastlz_compress(p_src,p_src_size,p_dst);
			}

		} break;
		case MODE_DEFLATE: {

			z_stream strm;
			strm.zalloc = zipio_alloc;
			strm.zfree = zipio_free;
			strm.opaque = Z_NULL;
			int err = deflateInit(&strm,Z_DEFAULT_COMPRESSION);
			if (err!=Z_OK)
			    return -1;

			strm.avail_in=p_src_size;
			int aout = deflateBound(&strm,p_src_size);;
			strm.avail_out=aout;
			strm.next_in=(Bytef*)p_src;
			strm.next_out=p_dst;
			deflate(&strm,Z_FINISH);
			aout = aout - strm.avail_out;
			deflateEnd(&strm);
			return aout;

		} break;
	}

	ERR_FAIL_V(-1);
}

/**
  Hash a block of memory and store the digest.
  @param hash   The index of the hash you wish to use
  @param in     The data you wish to hash
  @param inlen  The length of the data to hash (octets)
  @param out    [out] Where to store the digest
  @param outlen [in/out] Max size and resulting size of the digest
  @return CRYPT_OK if successful
*/
int hash_memory(int hash, const unsigned char *in, unsigned long inlen, unsigned char *out, unsigned long *outlen)
{
    hash_state *md;
    int err;

    LTC_ARGCHK(in     != NULL);
    LTC_ARGCHK(out    != NULL);
    LTC_ARGCHK(outlen != NULL);

    if ((err = hash_is_valid(hash)) != CRYPT_OK) {
        return err;
    }

    if (*outlen < hash_descriptor[hash].hashsize) {
       *outlen = hash_descriptor[hash].hashsize;
       return CRYPT_BUFFER_OVERFLOW;
    }

    md = XMALLOC(sizeof(hash_state));
    if (md == NULL) {
       return CRYPT_MEM;
    }

    if ((err = hash_descriptor[hash].init(md)) != CRYPT_OK) {
       goto LBL_ERR;
    }
    if ((err = hash_descriptor[hash].process(md, in, inlen)) != CRYPT_OK) {
       goto LBL_ERR;
    }
    err = hash_descriptor[hash].done(md, out);
    *outlen = hash_descriptor[hash].hashsize;
LBL_ERR:
#ifdef LTC_CLEAN_STACK
    zeromem(md, sizeof(hash_state));
#endif
    XFREE(md);

    return err;
}

int rng_make_prng(int bits, int wprng, prng_state *prng, 
                  void (*callback)(void))
{
   unsigned char buf[256];
   int err;
   
   _ARGCHK(prng != NULL);

   /* check parameter */
   if ((err = prng_is_valid(wprng)) != CRYPT_OK) {
      return err;
   }

   if (bits < 64 || bits > 1024) {
      return CRYPT_INVALID_PRNGSIZE;
   }

   if ((err = prng_descriptor[wprng].start(prng)) != CRYPT_OK) {
      return err;
   }

   bits = ((bits/8)+((bits&7)!=0?1:0)) * 2;
   if (rng_get_bytes(buf, (unsigned long)bits, callback) != (unsigned long)bits) {
      return CRYPT_ERROR_READPRNG;
   }

   if ((err = prng_descriptor[wprng].add_entropy(buf, (unsigned long)bits, prng)) != CRYPT_OK) {
      return err;
   }

   if ((err = prng_descriptor[wprng].ready(prng)) != CRYPT_OK) {
      return err;
   }

   #ifdef CLEAN_STACK
      zeromem(buf, sizeof(buf));
   #endif
   return CRYPT_OK;
}

/**
   OMAC a block of memory 
   @param cipher    The index of the desired cipher
   @param key       The secret key
   @param keylen    The length of the secret key (octets)
   @param in        The data to send through OMAC
   @param inlen     The length of the data to send through OMAC (octets)
   @param out       [out] The destination of the authentication tag
   @param outlen    [in/out]  The max size and resulting size of the authentication tag (octets)
   @return CRYPT_OK if successful
*/
int omac_memory(int cipher, 
                const unsigned char *key, unsigned long keylen,
                const unsigned char *in,  unsigned long inlen,
                      unsigned char *out, unsigned long *outlen)
{
   int err;
   omac_state *omac;

   LTC_ARGCHK(key    != NULL);
   LTC_ARGCHK(in     != NULL);
   LTC_ARGCHK(out    != NULL);
   LTC_ARGCHK(outlen != NULL);

   /* allocate ram for omac state */
   omac = XMALLOC(sizeof(omac_state));
   if (omac == NULL) {
      return CRYPT_MEM;
   }

   /* omac process the message */
   if ((err = omac_init(omac, cipher, key, keylen)) != CRYPT_OK) {
      goto LBL_ERR;
   }
   if ((err = omac_process(omac, in, inlen)) != CRYPT_OK) {
      goto LBL_ERR;
   }
   if ((err = omac_done(omac, out, outlen)) != CRYPT_OK) {
      goto LBL_ERR;
   }

   err = CRYPT_OK;
LBL_ERR:
#ifdef LTC_CLEAN_STACK
   zeromem(omac, sizeof(omac_state));
#endif

   XFREE(omac);
   return err;   
}

//==============================================================================
MidiOutFilter::MidiOutFilter()
{
    programs = new JuceProgram[getNumPrograms()];

    devices = MidiOutput::getDevices();
    midiOutput = 0;
	loadDefaultFxb();
    curProgram=0;
    init=true;
    setCurrentProgram (0);

    samplesToNextClock=0;
    samplesToNextMTC=0;
    wasPlaying=false;
    startAt=-999.0;
    startMTCAt=-999.0;
    sendclock=false;
    sendmtc=false;
    mtcNumber=0;

    zeromem (&lastPosInfo, sizeof (lastPosInfo));
}

void DemoJuceFilter::setSyncToHost (bool t)
{
	if (t != isSyncedToHost)
	{
		zeromem (&lastPosInfo, sizeof (lastPosInfo));
		lastPosInfo.timeSigNumerator = 4;
		lastPosInfo.timeSigDenominator = 4;
		lastPosInfo.bpm = 120;
		sendChangeMessage (this);
	}
	
	if (!t)
	{
		syncThread->setBPM (intBpm);
		syncThread->startThread();
	}
	else
	{
		syncThread->signalThreadShouldExit();
	}
	isSyncedToHost = t;
}

/**
  Process an entire GCM packet in one call.
  @param key               The secret key
  @param keylen            The length of the secret key
  @param iv                The initialization vector
  @param ivlen             The length of the initialization vector
  @param aad               The additional authentication data (header)
  @param aadlen            The length of the aad
  @param in                The plaintext
  @param inlen             The length of the plaintext (ciphertext length is the same)
  @param out               The ciphertext
  @param tag               [out] The MAC tag
  @param taglen            [in/out] The MAC tag length
  @param direction         Encrypt or Decrypt mode (CHCHA20POLY1305_ENCRYPT or CHCHA20POLY1305_DECRYPT)
  @return CRYPT_OK on success
 */
int chacha20poly1305_memory(const unsigned char *key, unsigned long keylen,
                            const unsigned char *iv,  unsigned long ivlen,
                            const unsigned char *aad, unsigned long aadlen,
                            const unsigned char *in,  unsigned long inlen,
                                  unsigned char *out,
                                  unsigned char *tag, unsigned long *taglen,
                            int direction)
{
   chacha20poly1305_state st;
   int err;

   LTC_ARGCHK(key != NULL);
   LTC_ARGCHK(iv  != NULL);
   LTC_ARGCHK(in  != NULL);
   LTC_ARGCHK(out != NULL);
   LTC_ARGCHK(tag != NULL);

   if ((err = chacha20poly1305_init(&st, key, keylen)) != CRYPT_OK)          { goto LBL_ERR; }
   if ((err = chacha20poly1305_setiv(&st, iv, ivlen)) != CRYPT_OK)           { goto LBL_ERR; }
   if (aad && aadlen > 0) {
      if ((err = chacha20poly1305_add_aad(&st, aad, aadlen)) != CRYPT_OK)    { goto LBL_ERR; }
   }
   if (direction == CHCHA20POLY1305_ENCRYPT) {
      if ((err = chacha20poly1305_encrypt(&st, in, inlen, out)) != CRYPT_OK) { goto LBL_ERR; }
   }
   else if (direction == CHCHA20POLY1305_DECRYPT) {
      if ((err = chacha20poly1305_decrypt(&st, in, inlen, out)) != CRYPT_OK) { goto LBL_ERR; }
   }
   else {
      err = CRYPT_INVALID_ARG;
      goto LBL_ERR;
   }
   err = chacha20poly1305_done(&st, tag, taglen);
LBL_ERR:
#ifdef LTC_CLEAN_STACK
   zeromem(&st, sizeof(chacha20poly1305_state));
#endif
   return err;
}

void AudioProcessorPlayer::audioDeviceAboutToStart (AudioIODevice* device)
{
    const ScopedLock sl (lock);

    sampleRate = device->getCurrentSampleRate();
    blockSize = device->getCurrentBufferSizeSamples();
    numInputChans = device->getActiveInputChannels().countNumberOfSetBits();
    numOutputChans = device->getActiveOutputChannels().countNumberOfSetBits();

    messageCollector.reset (sampleRate);
    zeromem (channels, sizeof (channels));

    if (processor != nullptr)
    {
        if (isPrepared)
            processor->releaseResources();

        AudioProcessor* const oldProcessor = processor;
        setProcessor (nullptr);
        setProcessor (oldProcessor);
    }
}

/*******************************************************************************
 * Given a secure payload entrypoint info pointer, entry point PC, register
 * width, cpu id & pointer to a context data structure, this function will
 * initialize tsp context and entry point info for the secure payload
 ******************************************************************************/
void tspd_init_tsp_ep_state(struct entry_point_info *tsp_entry_point,
				uint32_t rw,
				uint64_t pc,
				tsp_context_t *tsp_ctx)
{
	uint32_t ep_attr;

	/* Passing a NULL context is a critical programming error */
	assert(tsp_ctx);
	assert(tsp_entry_point);
	assert(pc);

	/*
	 * We support AArch64 TSP for now.
	 * TODO: Add support for AArch32 TSP
	 */
	assert(rw == TSP_AARCH64);

	/* Associate this context with the cpu specified */
	tsp_ctx->mpidr = read_mpidr_el1();
	tsp_ctx->state = 0;
	set_tsp_pstate(tsp_ctx->state, TSP_PSTATE_OFF);
	clr_yield_smc_active_flag(tsp_ctx->state);

	cm_set_context(&tsp_ctx->cpu_ctx, SECURE);

	/* initialise an entrypoint to set up the CPU context */
	ep_attr = SECURE | EP_ST_ENABLE;
	if (read_sctlr_el3() & SCTLR_EE_BIT)
		ep_attr |= EP_EE_BIG;
	SET_PARAM_HEAD(tsp_entry_point, PARAM_EP, VERSION_1, ep_attr);

	tsp_entry_point->pc = pc;
	tsp_entry_point->spsr = SPSR_64(MODE_EL1,
					MODE_SP_ELX,
					DISABLE_ALL_EXCEPTIONS);
	zeromem(&tsp_entry_point->args, sizeof(tsp_entry_point->args));
}

/**
  Create a DSA shared secret between two keys
  @param private_key      The private DSA key (the exponent)
  @param base             The base of the exponentiation (allows this to be used for both encrypt and decrypt) 
  @param public_key       The public key
  @param out              [out] Destination of the shared secret
  @param outlen           [in/out] The max size and resulting size of the shared secret
  @return CRYPT_OK if successful
*/
int dsa_shared_secret(void          *private_key, void *base,
                      dsa_key       *public_key,
                      unsigned char *out,         unsigned long *outlen)
{
   unsigned long  x;
   void          *res;
   int            err;

   LTC_ARGCHK(private_key != NULL);
   LTC_ARGCHK(public_key  != NULL);
   LTC_ARGCHK(out         != NULL);
   LTC_ARGCHK(outlen      != NULL);

   /* make new point */
   if ((err = mp_init(&res)) != CRYPT_OK) {
      return err;
   }

   if ((err = mp_exptmod(base, private_key, public_key->p, res)) != CRYPT_OK) {
      mp_clear(res);
      return err;
   }
   
   x = (unsigned long)mp_unsigned_bin_size(res);
   if (*outlen < x) {
      *outlen = x;
      err = CRYPT_BUFFER_OVERFLOW;
      goto done;
   }
   zeromem(out, x);
   if ((err = mp_to_unsigned_bin(res, out + (x - mp_unsigned_bin_size(res))))   != CRYPT_OK)          { goto done; }

   err     = CRYPT_OK;
   *outlen = x;
done:
   mp_clear(res);
   return err;
}

/**
   Initialize a Pelican state
   @param pelmac    The Pelican state to initialize
   @param key       The secret key
   @param keylen    The length of the secret key (octets)
   @return CRYPT_OK if successful
*/
int pelican_init(pelican_state *pelmac, const unsigned char *key, unsigned long keylen)
{
    int err;

    LTC_ARGCHK(pelmac != NULL);
    LTC_ARGCHK(key    != NULL);

#ifdef LTC_FAST
    if (16 % sizeof(LTC_FAST_TYPE)) {
        return CRYPT_INVALID_ARG;
    }
#endif

    if ((err = aes_setup(key, keylen, 0, &pelmac->K)) != CRYPT_OK) {
       return err;
    }

    zeromem(pelmac->state, 16);
    aes_ecb_encrypt(pelmac->state, pelmac->state, &pelmac->K);
    pelmac->buflen = 0;

    return CRYPT_OK;
}