text: /* ====================================================================
   * Copyright (c) 2011-2013 The OpenSSL Project.  All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   *
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in
   *    the documentation and/or other materials provided with the
   *    distribution.
   *
   * 3. All advertising materials mentioning features or use of this
   *    software must display the following acknowledgment:
   *    "This product includes software developed by the OpenSSL Project
   *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
   *
   * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
   *    endorse or promote products derived from this software without
   *    prior written permission. For written permission, please contact
   *    licensing@OpenSSL.org.
   *
   * 5. Products derived from this software may not be called "OpenSSL"
   *    nor may "OpenSSL" appear in their names without prior written
   *    permission of the OpenSSL Project.
   *
   * 6. Redistributions of any form whatsoever must retain the following
   *    acknowledgment:
   *    "This product includes software developed by the OpenSSL Project
   *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
   *
   * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
   * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
   * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
   * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
   * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
   * OF THE POSSIBILITY OF SUCH DAMAGE.
   * ====================================================================
   */
  
  #include <openssl/opensslconf.h>
  
  #include <stdio.h>
  #include <string.h>
  
  #if !defined(OPENSSL_NO_AES)
  
  # include <openssl/evp.h>
  # include <openssl/objects.h>
  # include <openssl/aes.h>
  # include <openssl/sha.h>
  # include <openssl/rand.h>
  # include "modes_lcl.h"
  # include "internal/evp_int.h"
  
  # ifndef EVP_CIPH_FLAG_AEAD_CIPHER
  #  define EVP_CIPH_FLAG_AEAD_CIPHER       0x200000
  #  define EVP_CTRL_AEAD_TLS1_AAD          0x16
  #  define EVP_CTRL_AEAD_SET_MAC_KEY       0x17
  # endif
  
  # if !defined(EVP_CIPH_FLAG_DEFAULT_ASN1)
  #  define EVP_CIPH_FLAG_DEFAULT_ASN1 0
  # endif
  
  # if !defined(EVP_CIPH_FLAG_TLS1_1_MULTIBLOCK)
  #  define EVP_CIPH_FLAG_TLS1_1_MULTIBLOCK 0
  # endif
  
  # define TLS1_1_VERSION 0x0302
  
  typedef struct {
      AES_KEY ks;
      SHA256_CTX head, tail, md;
      size_t payload_length;      /* AAD length in decrypt case */
      union {
          unsigned int tls_ver;
          unsigned char tls_aad[16]; /* 13 used */
      } aux;
  } EVP_AES_HMAC_SHA256;
  
  # define NO_PAYLOAD_LENGTH       ((size_t)-1)
  
  # if     defined(AES_ASM) &&     ( \
          defined(__x86_64)       || defined(__x86_64__)  || \
          defined(_M_AMD64)       || defined(_M_X64)      || \
          defined(__INTEL__)      )
  
  extern unsigned int OPENSSL_ia32cap_P[];
  #  define AESNI_CAPABLE   (1<<(57-32))
  
  int aesni_set_encrypt_key(const unsigned char *userKey, int bits,
                            AES_KEY *key);
  int aesni_set_decrypt_key(const unsigned char *userKey, int bits,
                            AES_KEY *key);
  
  void aesni_cbc_encrypt(const unsigned char *in,
                         unsigned char *out,
                         size_t length,
                         const AES_KEY *key, unsigned char *ivec, int enc);
  
  int aesni_cbc_sha256_enc(const void *inp, void *out, size_t blocks,
                           const AES_KEY *key, unsigned char iv[16],
                           SHA256_CTX *ctx, const void *in0);
  
  #  define data(ctx) ((EVP_AES_HMAC_SHA256 *)EVP_CIPHER_CTX_get_cipher_data(ctx))
  
  static int aesni_cbc_hmac_sha256_init_key(EVP_CIPHER_CTX *ctx,
                                            const unsigned char *inkey,
                                            const unsigned char *iv, int enc)
  {
      EVP_AES_HMAC_SHA256 *key = data(ctx);
      int ret;
  
      if (enc)
          memset(&key->ks, 0, sizeof(key->ks.rd_key)),
              ret = aesni_set_encrypt_key(inkey,
                                          EVP_CIPHER_CTX_key_length(ctx) * 8,
                                          &key->ks);
      else
          ret = aesni_set_decrypt_key(inkey,
                                      EVP_CIPHER_CTX_key_length(ctx) * 8,
                                      &key->ks);
  
      SHA256_Init(&key->head);    /* handy when benchmarking */
      key->tail = key->head;
      key->md = key->head;
  
      key->payload_length = NO_PAYLOAD_LENGTH;
  
      return ret < 0 ? 0 : 1;
  }
  
  #  define STITCHED_CALL
  
  #  if !defined(STITCHED_CALL)
  #   define aes_off 0
  #  endif
  
  void sha256_block_data_order(void *c, const void *p, size_t len);
  
  static void sha256_update(SHA256_CTX *c, const void *data, size_t len)
  {
      const unsigned char *ptr = data;
      size_t res;
  
      if ((res = c->num)) {
          res = SHA256_CBLOCK - res;
          if (len < res)
              res = len;
          SHA256_Update(c, ptr, res);
          ptr += res;
          len -= res;
      }
  
      res = len % SHA256_CBLOCK;
      len -= res;
  
      if (len) {
          sha256_block_data_order(c, ptr, len / SHA256_CBLOCK);
  
          ptr += len;
          c->Nh += len >> 29;
          c->Nl += len <<= 3;
          if (c->Nl < (unsigned int)len)
              c->Nh++;
      }
  
      if (res)
          SHA256_Update(c, ptr, res);
  }
  
  #  ifdef SHA256_Update
  #   undef SHA256_Update
  #  endif
  #  define SHA256_Update sha256_update
  
  #  if !defined(OPENSSL_NO_MULTIBLOCK) && EVP_CIPH_FLAG_TLS1_1_MULTIBLOCK
  
  typedef struct {
      unsigned int A[8], B[8], C[8], D[8], E[8], F[8], G[8], H[8];
  } SHA256_MB_CTX;
  typedef struct {
      const unsigned char *ptr;
      int blocks;
  } HASH_DESC;
  
  void sha256_multi_block(SHA256_MB_CTX *, const HASH_DESC *, int);
  
  typedef struct {
      const unsigned char *inp;
      unsigned char *out;
      int blocks;
      u64 iv[2];
  } CIPH_DESC;
  
  void aesni_multi_cbc_encrypt(CIPH_DESC *, void *, int);
  
  static size_t tls1_1_multi_block_encrypt(EVP_AES_HMAC_SHA256 *key,
                                           unsigned char *out,
                                           const unsigned char *inp,
                                           size_t inp_len, int n4x)
  {                               /* n4x is 1 or 2 */
      HASH_DESC hash_d[8], edges[8];
      CIPH_DESC ciph_d[8];
      unsigned char storage[sizeof(SHA256_MB_CTX) + 32];
      union {
          u64 q[16];
          u32 d[32];
          u8 c[128];
      } blocks[8];
      SHA256_MB_CTX *ctx;
      unsigned int frag, last, packlen, i, x4 = 4 * n4x, minblocks, processed =
          0;
      size_t ret = 0;
      u8 *IVs;
  #   if defined(BSWAP8)
      u64 seqnum;
  #   endif
  
      /* ask for IVs in bulk */
      if (RAND_bytes((IVs = blocks[0].c), 16 * x4) <= 0)
          return 0;
  
      /* align */
      ctx = (SHA256_MB_CTX *) (storage + 32 - ((size_t)storage % 32));
  
      frag = (unsigned int)inp_len >> (1 + n4x);
      last = (unsigned int)inp_len + frag - (frag << (1 + n4x));
      if (last > frag && ((last + 13 + 9) % 64) < (x4 - 1)) {
          frag++;
          last -= x4 - 1;
      }
  
      packlen = 5 + 16 + ((frag + 32 + 16) & -16);
  
      /* populate descriptors with pointers and IVs */
      hash_d[0].ptr = inp;
      ciph_d[0].inp = inp;
      /* 5+16 is place for header and explicit IV */
      ciph_d[0].out = out + 5 + 16;
      memcpy(ciph_d[0].out - 16, IVs, 16);
      memcpy(ciph_d[0].iv, IVs, 16);
      IVs += 16;
  
      for (i = 1; i < x4; i++) {
          ciph_d[i].inp = hash_d[i].ptr = hash_d[i - 1].ptr + frag;
          ciph_d[i].out = ciph_d[i - 1].out + packlen;
          memcpy(ciph_d[i].out - 16, IVs, 16);
          memcpy(ciph_d[i].iv, IVs, 16);
          IVs += 16;
      }
  
  #   if defined(BSWAP8)
      memcpy(blocks[0].c, key->md.data, 8);
      seqnum = BSWAP8(blocks[0].q[0]);
  #   endif
      for (i = 0; i < x4; i++) {
          unsigned int len = (i == (x4 - 1) ? last : frag);
  #   if !defined(BSWAP8)
          unsigned int carry, j;
  #   endif
  
          ctx->A[i] = key->md.h[0];
          ctx->B[i] = key->md.h[1];
          ctx->C[i] = key->md.h[2];
          ctx->D[i] = key->md.h[3];
          ctx->E[i] = key->md.h[4];
          ctx->F[i] = key->md.h[5];
          ctx->G[i] = key->md.h[6];
          ctx->H[i] = key->md.h[7];
  
          /* fix seqnum */
  #   if defined(BSWAP8)
          blocks[i].q[0] = BSWAP8(seqnum + i);
  #   else
          for (carry = i, j = 8; j--;) {
              blocks[i].c[j] = ((u8 *)key->md.data)[j] + carry;
              carry = (blocks[i].c[j] - carry) >> (sizeof(carry) * 8 - 1);
          }
  #   endif
          blocks[i].c[8] = ((u8 *)key->md.data)[8];
          blocks[i].c[9] = ((u8 *)key->md.data)[9];
          blocks[i].c[10] = ((u8 *)key->md.data)[10];
          /* fix length */
          blocks[i].c[11] = (u8)(len >> 8);
          blocks[i].c[12] = (u8)(len);
  
          memcpy(blocks[i].c + 13, hash_d[i].ptr, 64 - 13);
          hash_d[i].ptr += 64 - 13;
          hash_d[i].blocks = (len - (64 - 13)) / 64;
  
          edges[i].ptr = blocks[i].c;
          edges[i].blocks = 1;
      }
  
      /* hash 13-byte headers and first 64-13 bytes of inputs */
      sha256_multi_block(ctx, edges, n4x);
      /* hash bulk inputs */
  #   define MAXCHUNKSIZE    2048
  #   if     MAXCHUNKSIZE%64
  #    error  "MAXCHUNKSIZE is not divisible by 64"
  #   elif   MAXCHUNKSIZE
      /*
       * goal is to minimize pressure on L1 cache by moving in shorter steps,
       * so that hashed data is still in the cache by the time we encrypt it
       */
      minblocks = ((frag <= last ? frag : last) - (64 - 13)) / 64;
      if (minblocks > MAXCHUNKSIZE / 64) {
          for (i = 0; i < x4; i++) {
              edges[i].ptr = hash_d[i].ptr;
              edges[i].blocks = MAXCHUNKSIZE / 64;
              ciph_d[i].blocks = MAXCHUNKSIZE / 16;
          }
          do {
              sha256_multi_block(ctx, edges, n4x);
              aesni_multi_cbc_encrypt(ciph_d, &key->ks, n4x);
  
              for (i = 0; i < x4; i++) {
                  edges[i].ptr = hash_d[i].ptr += MAXCHUNKSIZE;
                  hash_d[i].blocks -= MAXCHUNKSIZE / 64;
                  edges[i].blocks = MAXCHUNKSIZE / 64;
                  ciph_d[i].inp += MAXCHUNKSIZE;
                  ciph_d[i].out += MAXCHUNKSIZE;
                  ciph_d[i].blocks = MAXCHUNKSIZE / 16;
                  memcpy(ciph_d[i].iv, ciph_d[i].out - 16, 16);
              }
              processed += MAXCHUNKSIZE;
              minblocks -= MAXCHUNKSIZE / 64;
          } while (minblocks > MAXCHUNKSIZE / 64);
      }
  #   endif
  #   undef  MAXCHUNKSIZE
      sha256_multi_block(ctx, hash_d, n4x);
  
      memset(blocks, 0, sizeof(blocks));
      for (i = 0; i < x4; i++) {
          unsigned int len = (i == (x4 - 1) ? last : frag),
              off = hash_d[i].blocks * 64;
          const unsigned char *ptr = hash_d[i].ptr + off;
  
          off = (len - processed) - (64 - 13) - off; /* remainder actually */
          memcpy(blocks[i].c, ptr, off);
          blocks[i].c[off] = 0x80;
          len += 64 + 13;         /* 64 is HMAC header */
          len *= 8;               /* convert to bits */
          if (off < (64 - 8)) {
  #   ifdef BSWAP4
              blocks[i].d[15] = BSWAP4(len);
  #   else
              PUTU32(blocks[i].c + 60, len);
  #   endif
              edges[i].blocks = 1;
          } else {
  #   ifdef BSWAP4
              blocks[i].d[31] = BSWAP4(len);
  #   else
              PUTU32(blocks[i].c + 124, len);
  #   endif
              edges[i].blocks = 2;
          }
          edges[i].ptr = blocks[i].c;
      }
  
      /* hash input tails and finalize */
      sha256_multi_block(ctx, edges, n4x);
  
      memset(blocks, 0, sizeof(blocks));
      for (i = 0; i < x4; i++) {
  #   ifdef BSWAP4
          blocks[i].d[0] = BSWAP4(ctx->A[i]);
          ctx->A[i] = key->tail.h[0];
          blocks[i].d[1] = BSWAP4(ctx->B[i]);
          ctx->B[i] = key->tail.h[1];
          blocks[i].d[2] = BSWAP4(ctx->C[i]);
          ctx->C[i] = key->tail.h[2];
          blocks[i].d[3] = BSWAP4(ctx->D[i]);
          ctx->D[i] = key->tail.h[3];
          blocks[i].d[4] = BSWAP4(ctx->E[i]);
          ctx->E[i] = key->tail.h[4];
          blocks[i].d[5] = BSWAP4(ctx->F[i]);
          ctx->F[i] = key->tail.h[5];
          blocks[i].d[6] = BSWAP4(ctx->G[i]);
          ctx->G[i] = key->tail.h[6];
          blocks[i].d[7] = BSWAP4(ctx->H[i]);
          ctx->H[i] = key->tail.h[7];
          blocks[i].c[32] = 0x80;
          blocks[i].d[15] = BSWAP4((64 + 32) * 8);
  #   else
          PUTU32(blocks[i].c + 0, ctx->A[i]);
          ctx->A[i] = key->tail.h[0];
          PUTU32(blocks[i].c + 4, ctx->B[i]);
          ctx->B[i] = key->tail.h[1];
          PUTU32(blocks[i].c + 8, ctx->C[i]);
          ctx->C[i] = key->tail.h[2];
          PUTU32(blocks[i].c + 12, ctx->D[i]);
          ctx->D[i] = key->tail.h[3];
          PUTU32(blocks[i].c + 16, ctx->E[i]);
          ctx->E[i] = key->tail.h[4];
          PUTU32(blocks[i].c + 20, ctx->F[i]);
          ctx->F[i] = key->tail.h[5];
          PUTU32(blocks[i].c + 24, ctx->G[i]);
          ctx->G[i] = key->tail.h[6];
          PUTU32(blocks[i].c + 28, ctx->H[i]);
          ctx->H[i] = key->tail.h[7];
          blocks[i].c[32] = 0x80;
          PUTU32(blocks[i].c + 60, (64 + 32) * 8);
  #   endif
          edges[i].ptr = blocks[i].c;
          edges[i].blocks = 1;
      }
  
      /* finalize MACs */
      sha256_multi_block(ctx, edges, n4x);
  
      for (i = 0; i < x4; i++) {
          unsigned int len = (i == (x4 - 1) ? last : frag), pad, j;
          unsigned char *out0 = out;
  
          memcpy(ciph_d[i].out, ciph_d[i].inp, len - processed);
          ciph_d[i].inp = ciph_d[i].out;
  
          out += 5 + 16 + len;
  
          /* write MAC */
          PUTU32(out + 0, ctx->A[i]);
          PUTU32(out + 4, ctx->B[i]);
          PUTU32(out + 8, ctx->C[i]);
          PUTU32(out + 12, ctx->D[i]);
          PUTU32(out + 16, ctx->E[i]);
          PUTU32(out + 20, ctx->F[i]);
          PUTU32(out + 24, ctx->G[i]);
          PUTU32(out + 28, ctx->H[i]);
          out += 32;
          len += 32;
  
          /* pad */
          pad = 15 - len % 16;
          for (j = 0; j <= pad; j++)
              *(out++) = pad;
          len += pad + 1;
  
          ciph_d[i].blocks = (len - processed) / 16;
          len += 16;              /* account for explicit iv */
  
          /* arrange header */
          out0[0] = ((u8 *)key->md.data)[8];
          out0[1] = ((u8 *)key->md.data)[9];
          out0[2] = ((u8 *)key->md.data)[10];
          out0[3] = (u8)(len >> 8);
          out0[4] = (u8)(len);
  
          ret += len + 5;
          inp += frag;
      }
  
      aesni_multi_cbc_encrypt(ciph_d, &key->ks, n4x);
  
      OPENSSL_cleanse(blocks, sizeof(blocks));
      OPENSSL_cleanse(ctx, sizeof(*ctx));
  
      return ret;
  }
  #  endif
  
  static int aesni_cbc_hmac_sha256_cipher(EVP_CIPHER_CTX *ctx,
                                          unsigned char *out,
                                          const unsigned char *in, size_t len)
  {
      EVP_AES_HMAC_SHA256 *key = data(ctx);
      unsigned int l;
      size_t plen = key->payload_length, iv = 0, /* explicit IV in TLS 1.1 and
                                                  * later */
          sha_off = 0;
  #  if defined(STITCHED_CALL)
      size_t aes_off = 0, blocks;
  
      sha_off = SHA256_CBLOCK - key->md.num;
  #  endif
  
      key->payload_length = NO_PAYLOAD_LENGTH;
  
      if (len % AES_BLOCK_SIZE)
          return 0;
  
      if (EVP_CIPHER_CTX_encrypting(ctx)) {
          if (plen == NO_PAYLOAD_LENGTH)
              plen = len;
          else if (len !=
                   ((plen + SHA256_DIGEST_LENGTH +
                     AES_BLOCK_SIZE) & -AES_BLOCK_SIZE))
              return 0;
          else if (key->aux.tls_ver >= TLS1_1_VERSION)
              iv = AES_BLOCK_SIZE;
  
  #  if defined(STITCHED_CALL)
          /*
           * Assembly stitch handles AVX-capable processors, but its
           * performance is not optimal on AMD Jaguar, ~40% worse, for
           * unknown reasons. Incidentally processor in question supports
           * AVX, but not AMD-specific XOP extension, which can be used
           * to identify it and avoid stitch invocation. So that after we
           * establish that current CPU supports AVX, we even see if it's
           * either even XOP-capable Bulldozer-based or GenuineIntel one.
           */
          if (OPENSSL_ia32cap_P[1] & (1 << (60 - 32)) && /* AVX? */
              ((OPENSSL_ia32cap_P[1] & (1 << (43 - 32))) /* XOP? */
               | (OPENSSL_ia32cap_P[0] & (1<<30))) &&    /* "Intel CPU"? */
              plen > (sha_off + iv) &&
              (blocks = (plen - (sha_off + iv)) / SHA256_CBLOCK)) {
              SHA256_Update(&key->md, in + iv, sha_off);
  
              (void)aesni_cbc_sha256_enc(in, out, blocks, &key->ks,
                                         EVP_CIPHER_CTX_iv_noconst(ctx),
                                         &key->md, in + iv + sha_off);
              blocks *= SHA256_CBLOCK;
              aes_off += blocks;
              sha_off += blocks;
              key->md.Nh += blocks >> 29;
              key->md.Nl += blocks <<= 3;
              if (key->md.Nl < (unsigned int)blocks)
                  key->md.Nh++;
          } else {
              sha_off = 0;
          }
  #  endif
          sha_off += iv;
          SHA256_Update(&key->md, in + sha_off, plen - sha_off);
  
          if (plen != len) {      /* "TLS" mode of operation */
              if (in != out)
                  memcpy(out + aes_off, in + aes_off, plen - aes_off);
  
              /* calculate HMAC and append it to payload */
              SHA256_Final(out + plen, &key->md);
              key->md = key->tail;
              SHA256_Update(&key->md, out + plen, SHA256_DIGEST_LENGTH);
              SHA256_Final(out + plen, &key->md);
  
              /* pad the payload|hmac */
              plen += SHA256_DIGEST_LENGTH;
              for (l = len - plen - 1; plen < len; plen++)
                  out[plen] = l;
              /* encrypt HMAC|padding at once */
              aesni_cbc_encrypt(out + aes_off, out + aes_off, len - aes_off,
                                &key->ks, EVP_CIPHER_CTX_iv_noconst(ctx), 1);
          } else {
              aesni_cbc_encrypt(in + aes_off, out + aes_off, len - aes_off,
                                &key->ks, EVP_CIPHER_CTX_iv_noconst(ctx), 1);
          }
      } else {
          union {
              unsigned int u[SHA256_DIGEST_LENGTH / sizeof(unsigned int)];
              unsigned char c[64 + SHA256_DIGEST_LENGTH];
          } mac, *pmac;
  
          /* arrange cache line alignment */
          pmac = (void *)(((size_t)mac.c + 63) & ((size_t)0 - 64));
  
          /* decrypt HMAC|padding at once */
          aesni_cbc_encrypt(in, out, len, &key->ks,
                            EVP_CIPHER_CTX_iv_noconst(ctx), 0);
  
          if (plen != NO_PAYLOAD_LENGTH) { /* "TLS" mode of operation */
              size_t inp_len, mask, j, i;
              unsigned int res, maxpad, pad, bitlen;
              int ret = 1;
              union {
                  unsigned int u[SHA_LBLOCK];
                  unsigned char c[SHA256_CBLOCK];
              } *data = (void *)key->md.data;
  
              if ((key->aux.tls_aad[plen - 4] << 8 | key->aux.tls_aad[plen - 3])
                  >= TLS1_1_VERSION)
                  iv = AES_BLOCK_SIZE;
  
              if (len < (iv + SHA256_DIGEST_LENGTH + 1))
                  return 0;
  
              /* omit explicit iv */
              out += iv;
              len -= iv;
  
              /* figure out payload length */
              pad = out[len - 1];
              maxpad = len - (SHA256_DIGEST_LENGTH + 1);
              maxpad |= (255 - maxpad) >> (sizeof(maxpad) * 8 - 8);
              maxpad &= 255;
  
              inp_len = len - (SHA256_DIGEST_LENGTH + pad + 1);
              mask = (0 - ((inp_len - len) >> (sizeof(inp_len) * 8 - 1)));
              inp_len &= mask;
              ret &= (int)mask;
  
              key->aux.tls_aad[plen - 2] = inp_len >> 8;
              key->aux.tls_aad[plen - 1] = inp_len;
  
              /* calculate HMAC */
              key->md = key->head;
              SHA256_Update(&key->md, key->aux.tls_aad, plen);
  
  #  if 1
              len -= SHA256_DIGEST_LENGTH; /* amend mac */
              if (len >= (256 + SHA256_CBLOCK)) {
                  j = (len - (256 + SHA256_CBLOCK)) & (0 - SHA256_CBLOCK);
                  j += SHA256_CBLOCK - key->md.num;
                  SHA256_Update(&key->md, out, j);
                  out += j;
                  len -= j;
                  inp_len -= j;
              }
  
              /* but pretend as if we hashed padded payload */
              bitlen = key->md.Nl + (inp_len << 3); /* at most 18 bits */
  #   ifdef BSWAP4
              bitlen = BSWAP4(bitlen);
  #   else
              mac.c[0] = 0;
              mac.c[1] = (unsigned char)(bitlen >> 16);
              mac.c[2] = (unsigned char)(bitlen >> 8);
              mac.c[3] = (unsigned char)bitlen;
              bitlen = mac.u[0];
  #   endif
  
              pmac->u[0] = 0;
              pmac->u[1] = 0;
              pmac->u[2] = 0;
              pmac->u[3] = 0;
              pmac->u[4] = 0;
              pmac->u[5] = 0;
              pmac->u[6] = 0;
              pmac->u[7] = 0;
  
              for (res = key->md.num, j = 0; j < len; j++) {
                  size_t c = out[j];
                  mask = (j - inp_len) >> (sizeof(j) * 8 - 8);
                  c &= mask;
                  c |= 0x80 & ~mask & ~((inp_len - j) >> (sizeof(j) * 8 - 8));
                  data->c[res++] = (unsigned char)c;
  
                  if (res != SHA256_CBLOCK)
                      continue;
  
                  /* j is not incremented yet */
                  mask = 0 - ((inp_len + 7 - j) >> (sizeof(j) * 8 - 1));
                  data->u[SHA_LBLOCK - 1] |= bitlen & mask;
                  sha256_block_data_order(&key->md, data, 1);
                  mask &= 0 - ((j - inp_len - 72) >> (sizeof(j) * 8 - 1));
                  pmac->u[0] |= key->md.h[0] & mask;
                  pmac->u[1] |= key->md.h[1] & mask;
                  pmac->u[2] |= key->md.h[2] & mask;
                  pmac->u[3] |= key->md.h[3] & mask;
                  pmac->u[4] |= key->md.h[4] & mask;
                  pmac->u[5] |= key->md.h[5] & mask;
                  pmac->u[6] |= key->md.h[6] & mask;
                  pmac->u[7] |= key->md.h[7] & mask;
                  res = 0;
              }
  
              for (i = res; i < SHA256_CBLOCK; i++, j++)
                  data->c[i] = 0;
  
              if (res > SHA256_CBLOCK - 8) {
                  mask = 0 - ((inp_len + 8 - j) >> (sizeof(j) * 8 - 1));
                  data->u[SHA_LBLOCK - 1] |= bitlen & mask;
                  sha256_block_data_order(&key->md, data, 1);
                  mask &= 0 - ((j - inp_len - 73) >> (sizeof(j) * 8 - 1));
                  pmac->u[0] |= key->md.h[0] & mask;
                  pmac->u[1] |= key->md.h[1] & mask;
                  pmac->u[2] |= key->md.h[2] & mask;
                  pmac->u[3] |= key->md.h[3] & mask;
                  pmac->u[4] |= key->md.h[4] & mask;
                  pmac->u[5] |= key->md.h[5] & mask;
                  pmac->u[6] |= key->md.h[6] & mask;
                  pmac->u[7] |= key->md.h[7] & mask;
  
                  memset(data, 0, SHA256_CBLOCK);
                  j += 64;
              }
              data->u[SHA_LBLOCK - 1] = bitlen;
              sha256_block_data_order(&key->md, data, 1);
              mask = 0 - ((j - inp_len - 73) >> (sizeof(j) * 8 - 1));
              pmac->u[0] |= key->md.h[0] & mask;
              pmac->u[1] |= key->md.h[1] & mask;
              pmac->u[2] |= key->md.h[2] & mask;
              pmac->u[3] |= key->md.h[3] & mask;
              pmac->u[4] |= key->md.h[4] & mask;
              pmac->u[5] |= key->md.h[5] & mask;
              pmac->u[6] |= key->md.h[6] & mask;
              pmac->u[7] |= key->md.h[7] & mask;
  
  #   ifdef BSWAP4
              pmac->u[0] = BSWAP4(pmac->u[0]);
              pmac->u[1] = BSWAP4(pmac->u[1]);
              pmac->u[2] = BSWAP4(pmac->u[2]);
              pmac->u[3] = BSWAP4(pmac->u[3]);
              pmac->u[4] = BSWAP4(pmac->u[4]);
              pmac->u[5] = BSWAP4(pmac->u[5]);
              pmac->u[6] = BSWAP4(pmac->u[6]);
              pmac->u[7] = BSWAP4(pmac->u[7]);
  #   else
              for (i = 0; i < 8; i++) {
                  res = pmac->u[i];
                  pmac->c[4 * i + 0] = (unsigned char)(res >> 24);
                  pmac->c[4 * i + 1] = (unsigned char)(res >> 16);
                  pmac->c[4 * i + 2] = (unsigned char)(res >> 8);
                  pmac->c[4 * i + 3] = (unsigned char)res;
              }
  #   endif
              len += SHA256_DIGEST_LENGTH;
  #  else
              SHA256_Update(&key->md, out, inp_len);
              res = key->md.num;
              SHA256_Final(pmac->c, &key->md);
  
              {
                  unsigned int inp_blocks, pad_blocks;
  
                  /* but pretend as if we hashed padded payload */
                  inp_blocks =
                      1 + ((SHA256_CBLOCK - 9 - res) >> (sizeof(res) * 8 - 1));
                  res += (unsigned int)(len - inp_len);
                  pad_blocks = res / SHA256_CBLOCK;
                  res %= SHA256_CBLOCK;
                  pad_blocks +=
                      1 + ((SHA256_CBLOCK - 9 - res) >> (sizeof(res) * 8 - 1));
                  for (; inp_blocks < pad_blocks; inp_blocks++)
                      sha1_block_data_order(&key->md, data, 1);
              }
  #  endif
              key->md = key->tail;
              SHA256_Update(&key->md, pmac->c, SHA256_DIGEST_LENGTH);
              SHA256_Final(pmac->c, &key->md);
  
              /* verify HMAC */
              out += inp_len;
              len -= inp_len;
  #  if 1
              {
                  unsigned char *p =
                      out + len - 1 - maxpad - SHA256_DIGEST_LENGTH;
                  size_t off = out - p;
                  unsigned int c, cmask;
  
                  maxpad += SHA256_DIGEST_LENGTH;
                  for (res = 0, i = 0, j = 0; j < maxpad; j++) {
                      c = p[j];
                      cmask =
                          ((int)(j - off - SHA256_DIGEST_LENGTH)) >>
                          (sizeof(int) * 8 - 1);
                      res |= (c ^ pad) & ~cmask; /* ... and padding */
                      cmask &= ((int)(off - 1 - j)) >> (sizeof(int) * 8 - 1);
                      res |= (c ^ pmac->c[i]) & cmask;
                      i += 1 & cmask;
                  }
                  maxpad -= SHA256_DIGEST_LENGTH;
  
                  res = 0 - ((0 - res) >> (sizeof(res) * 8 - 1));
                  ret &= (int)~res;
              }
  #  else
              for (res = 0, i = 0; i < SHA256_DIGEST_LENGTH; i++)
                  res |= out[i] ^ pmac->c[i];
              res = 0 - ((0 - res) >> (sizeof(res) * 8 - 1));
              ret &= (int)~res;
  
              /* verify padding */
              pad = (pad & ~res) | (maxpad & res);
              out = out + len - 1 - pad;
              for (res = 0, i = 0; i < pad; i++)
                  res |= out[i] ^ pad;
  
              res = (0 - res) >> (sizeof(res) * 8 - 1);
              ret &= (int)~res;
  #  endif
              return ret;
          } else {
              SHA256_Update(&key->md, out, len);
          }
      }
  
      return 1;
  }
  
  static int aesni_cbc_hmac_sha256_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg,
                                        void *ptr)
  {
      EVP_AES_HMAC_SHA256 *key = data(ctx);
      unsigned int u_arg = (unsigned int)arg;
  
      switch (type) {
      case EVP_CTRL_AEAD_SET_MAC_KEY:
          {
              unsigned int i;
              unsigned char hmac_key[64];
  
              memset(hmac_key, 0, sizeof(hmac_key));
  
              if (arg < 0)
                  return -1;
  
              if (u_arg > sizeof(hmac_key)) {
                  SHA256_Init(&key->head);
                  SHA256_Update(&key->head, ptr, arg);
                  SHA256_Final(hmac_key, &key->head);
              } else {
                  memcpy(hmac_key, ptr, arg);
              }
  
              for (i = 0; i < sizeof(hmac_key); i++)
                  hmac_key[i] ^= 0x36; /* ipad */
              SHA256_Init(&key->head);
              SHA256_Update(&key->head, hmac_key, sizeof(hmac_key));
  
              for (i = 0; i < sizeof(hmac_key); i++)
                  hmac_key[i] ^= 0x36 ^ 0x5c; /* opad */
              SHA256_Init(&key->tail);
              SHA256_Update(&key->tail, hmac_key, sizeof(hmac_key));
  
              OPENSSL_cleanse(hmac_key, sizeof(hmac_key));
  
              return 1;
          }
      case EVP_CTRL_AEAD_TLS1_AAD:
          {
              unsigned char *p = ptr;
              unsigned int len = p[arg - 2] << 8 | p[arg - 1];
  
              if (arg != EVP_AEAD_TLS1_AAD_LEN)
                  return -1;
  
              if (EVP_CIPHER_CTX_encrypting(ctx)) {
                  key->payload_length = len;
                  if ((key->aux.tls_ver =
                       p[arg - 4] << 8 | p[arg - 3]) >= TLS1_1_VERSION) {
                      len -= AES_BLOCK_SIZE;
                      p[arg - 2] = len >> 8;
                      p[arg - 1] = len;
                  }
                  key->md = key->head;
                  SHA256_Update(&key->md, p, arg);
  
                  return (int)(((len + SHA256_DIGEST_LENGTH +
                                 AES_BLOCK_SIZE) & -AES_BLOCK_SIZE)
                               - len);
              } else {
                  memcpy(key->aux.tls_aad, ptr, arg);
                  key->payload_length = arg;
  
                  return SHA256_DIGEST_LENGTH;
              }
          }
  #  if !defined(OPENSSL_NO_MULTIBLOCK) && EVP_CIPH_FLAG_TLS1_1_MULTIBLOCK
      case EVP_CTRL_TLS1_1_MULTIBLOCK_MAX_BUFSIZE:
          return (int)(5 + 16 + ((arg + 32 + 16) & -16));
      case EVP_CTRL_TLS1_1_MULTIBLOCK_AAD:
          {
              EVP_CTRL_TLS1_1_MULTIBLOCK_PARAM *param =
                  (EVP_CTRL_TLS1_1_MULTIBLOCK_PARAM *) ptr;
              unsigned int n4x = 1, x4;
              unsigned int frag, last, packlen, inp_len;
  
              if (arg < 0)
                  return -1;
  
              if (u_arg < sizeof(EVP_CTRL_TLS1_1_MULTIBLOCK_PARAM))
                  return -1;
  
              inp_len = param->inp[11] << 8 | param->inp[12];
  
              if (EVP_CIPHER_CTX_encrypting(ctx)) {
                  if ((param->inp[9] << 8 | param->inp[10]) < TLS1_1_VERSION)
                      return -1;
  
                  if (inp_len) {
                      if (inp_len < 4096)
                          return 0; /* too short */
  
                      if (inp_len >= 8192 && OPENSSL_ia32cap_P[2] & (1 << 5))
                          n4x = 2; /* AVX2 */
                  } else if ((n4x = param->interleave / 4) && n4x <= 2)
                      inp_len = param->len;
                  else
                      return -1;
  
                  key->md = key->head;
                  SHA256_Update(&key->md, param->inp, 13);
  
                  x4 = 4 * n4x;
                  n4x += 1;
  
                  frag = inp_len >> n4x;
                  last = inp_len + frag - (frag << n4x);
                  if (last > frag && ((last + 13 + 9) % 64 < (x4 - 1))) {
                      frag++;
                      last -= x4 - 1;
                  }
  
                  packlen = 5 + 16 + ((frag + 32 + 16) & -16);
                  packlen = (packlen << n4x) - packlen;
                  packlen += 5 + 16 + ((last + 32 + 16) & -16);
  
                  param->interleave = x4;
  
                  return (int)packlen;
              } else
                  return -1;      /* not yet */
          }
      case EVP_CTRL_TLS1_1_MULTIBLOCK_ENCRYPT:
          {
              EVP_CTRL_TLS1_1_MULTIBLOCK_PARAM *param =
                  (EVP_CTRL_TLS1_1_MULTIBLOCK_PARAM *) ptr;
  
              return (int)tls1_1_multi_block_encrypt(key, param->out,
                                                     param->inp, param->len,
                                                     param->interleave / 4);
          }
      case EVP_CTRL_TLS1_1_MULTIBLOCK_DECRYPT:
  #  endif
      default:
          return -1;
      }
  }
  
  static EVP_CIPHER aesni_128_cbc_hmac_sha256_cipher = {
  #  ifdef NID_aes_128_cbc_hmac_sha256
      NID_aes_128_cbc_hmac_sha256,
  #  else
      NID_undef,
  #  endif
      AES_BLOCK_SIZE, 16, AES_BLOCK_SIZE,
      EVP_CIPH_CBC_MODE | EVP_CIPH_FLAG_DEFAULT_ASN1 |
          EVP_CIPH_FLAG_AEAD_CIPHER | EVP_CIPH_FLAG_TLS1_1_MULTIBLOCK,
      aesni_cbc_hmac_sha256_init_key,
      aesni_cbc_hmac_sha256_cipher,
      NULL,
      sizeof(EVP_AES_HMAC_SHA256),
      EVP_CIPH_FLAG_DEFAULT_ASN1 ? NULL : EVP_CIPHER_set_asn1_iv,
      EVP_CIPH_FLAG_DEFAULT_ASN1 ? NULL : EVP_CIPHER_get_asn1_iv,
      aesni_cbc_hmac_sha256_ctrl,
      NULL
  };
  
  static EVP_CIPHER aesni_256_cbc_hmac_sha256_cipher = {
  #  ifdef NID_aes_256_cbc_hmac_sha256
      NID_aes_256_cbc_hmac_sha256,
  #  else
      NID_undef,
  #  endif
      AES_BLOCK_SIZE, 32, AES_BLOCK_SIZE,
      EVP_CIPH_CBC_MODE | EVP_CIPH_FLAG_DEFAULT_ASN1 |
          EVP_CIPH_FLAG_AEAD_CIPHER | EVP_CIPH_FLAG_TLS1_1_MULTIBLOCK,
      aesni_cbc_hmac_sha256_init_key,
      aesni_cbc_hmac_sha256_cipher,
      NULL,
      sizeof(EVP_AES_HMAC_SHA256),
      EVP_CIPH_FLAG_DEFAULT_ASN1 ? NULL : EVP_CIPHER_set_asn1_iv,
      EVP_CIPH_FLAG_DEFAULT_ASN1 ? NULL : EVP_CIPHER_get_asn1_iv,
      aesni_cbc_hmac_sha256_ctrl,
      NULL
  };
  
  const EVP_CIPHER *EVP_aes_128_cbc_hmac_sha256(void)
  {
      return ((OPENSSL_ia32cap_P[1] & AESNI_CAPABLE) &&
              aesni_cbc_sha256_enc(NULL, NULL, 0, NULL, NULL, NULL, NULL) ?
              &aesni_128_cbc_hmac_sha256_cipher : NULL);
  }
  
  const EVP_CIPHER *EVP_aes_256_cbc_hmac_sha256(void)
  {
      return ((OPENSSL_ia32cap_P[1] & AESNI_CAPABLE) &&
              aesni_cbc_sha256_enc(NULL, NULL, 0, NULL, NULL, NULL, NULL) ?
              &aesni_256_cbc_hmac_sha256_cipher : NULL);
  }
  # else
  const EVP_CIPHER *EVP_aes_128_cbc_hmac_sha256(void)
  {
      return NULL;
  }
  
  const EVP_CIPHER *EVP_aes_256_cbc_hmac_sha256(void)
  {
      return NULL;
  }
  # endif
  #endif
  