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) && !defined(OPENSSL_NO_SHA1)
  
  # include <openssl/evp.h>
  # include <openssl/objects.h>
  # include <openssl/aes.h>
  # include <openssl/sha.h>
  # include "evp_locl.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
  
  # define TLS1_1_VERSION 0x0302
  
  typedef struct {
      AES_KEY ks;
      SHA_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_SHA1;
  
  # 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__)      )
  
  #  if defined(__GNUC__) && __GNUC__>=2 && !defined(PEDANTIC)
  #   define BSWAP(x) ({ unsigned int r=(x); asm ("bswapl %0":"=r"(r):"0"(r)); r; })
  #  endif
  
  extern unsigned int OPENSSL_ia32cap_P[2];
  #  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);
  
  void aesni_cbc_sha1_enc(const void *inp, void *out, size_t blocks,
                          const AES_KEY *key, unsigned char iv[16],
                          SHA_CTX *ctx, const void *in0);
  
  #  define data(ctx) ((EVP_AES_HMAC_SHA1 *)(ctx)->cipher_data)
  
  static int aesni_cbc_hmac_sha1_init_key(EVP_CIPHER_CTX *ctx,
                                          const unsigned char *inkey,
                                          const unsigned char *iv, int enc)
  {
      EVP_AES_HMAC_SHA1 *key = data(ctx);
      int ret;
  
      if (enc)
          ret = aesni_set_encrypt_key(inkey, ctx->key_len * 8, &key->ks);
      else
          ret = aesni_set_decrypt_key(inkey, ctx->key_len * 8, &key->ks);
  
      SHA1_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 sha1_block_data_order(void *c, const void *p, size_t len);
  
  static void sha1_update(SHA_CTX *c, const void *data, size_t len)
  {
      const unsigned char *ptr = data;
      size_t res;
  
      if ((res = c->num)) {
          res = SHA_CBLOCK - res;
          if (len < res)
              res = len;
          SHA1_Update(c, ptr, res);
          ptr += res;
          len -= res;
      }
  
      res = len % SHA_CBLOCK;
      len -= res;
  
      if (len) {
          sha1_block_data_order(c, ptr, len / SHA_CBLOCK);
  
          ptr += len;
          c->Nh += len >> 29;
          c->Nl += len <<= 3;
          if (c->Nl < (unsigned int)len)
              c->Nh++;
      }
  
      if (res)
          SHA1_Update(c, ptr, res);
  }
  
  #  ifdef SHA1_Update
  #   undef SHA1_Update
  #  endif
  #  define SHA1_Update sha1_update
  
  static int aesni_cbc_hmac_sha1_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
                                        const unsigned char *in, size_t len)
  {
      EVP_AES_HMAC_SHA1 *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 = SHA_CBLOCK - key->md.num;
  #  endif
  
      key->payload_length = NO_PAYLOAD_LENGTH;
  
      if (len % AES_BLOCK_SIZE)
          return 0;
  
      if (ctx->encrypt) {
          if (plen == NO_PAYLOAD_LENGTH)
              plen = len;
          else if (len !=
                   ((plen + SHA_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)
          if (plen > (sha_off + iv)
              && (blocks = (plen - (sha_off + iv)) / SHA_CBLOCK)) {
              SHA1_Update(&key->md, in + iv, sha_off);
  
              aesni_cbc_sha1_enc(in, out, blocks, &key->ks,
                                 ctx->iv, &key->md, in + iv + sha_off);
              blocks *= SHA_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;
          SHA1_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 */
              SHA1_Final(out + plen, &key->md);
              key->md = key->tail;
              SHA1_Update(&key->md, out + plen, SHA_DIGEST_LENGTH);
              SHA1_Final(out + plen, &key->md);
  
              /* pad the payload|hmac */
              plen += SHA_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, ctx->iv, 1);
          } else {
              aesni_cbc_encrypt(in + aes_off, out + aes_off, len - aes_off,
                                &key->ks, ctx->iv, 1);
          }
      } else {
          union {
              unsigned int u[SHA_DIGEST_LENGTH / sizeof(unsigned int)];
              unsigned char c[32 + SHA_DIGEST_LENGTH];
          } mac, *pmac;
  
          /* arrange cache line alignment */
          pmac = (void *)(((size_t)mac.c + 31) & ((size_t)0 - 32));
  
          /* decrypt HMAC|padding at once */
          aesni_cbc_encrypt(in, out, len, &key->ks, ctx->iv, 0);
  
          if (plen) {             /* "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[SHA_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 + SHA_DIGEST_LENGTH + 1))
                  return 0;
  
              /* omit explicit iv */
              out += iv;
              len -= iv;
  
              /* figure out payload length */
              pad = out[len - 1];
              maxpad = len - (SHA_DIGEST_LENGTH + 1);
              maxpad |= (255 - maxpad) >> (sizeof(maxpad) * 8 - 8);
              maxpad &= 255;
  
              inp_len = len - (SHA_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;
              SHA1_Update(&key->md, key->aux.tls_aad, plen);
  
  #  if 1
              len -= SHA_DIGEST_LENGTH; /* amend mac */
              if (len >= (256 + SHA_CBLOCK)) {
                  j = (len - (256 + SHA_CBLOCK)) & (0 - SHA_CBLOCK);
                  j += SHA_CBLOCK - key->md.num;
                  SHA1_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 BSWAP
              bitlen = BSWAP(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;
  
              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 != SHA_CBLOCK)
                      continue;
  
                  /* j is not incremented yet */
                  mask = 0 - ((inp_len + 7 - j) >> (sizeof(j) * 8 - 1));
                  data->u[SHA_LBLOCK - 1] |= bitlen & mask;
                  sha1_block_data_order(&key->md, data, 1);
                  mask &= 0 - ((j - inp_len - 72) >> (sizeof(j) * 8 - 1));
                  pmac->u[0] |= key->md.h0 & mask;
                  pmac->u[1] |= key->md.h1 & mask;
                  pmac->u[2] |= key->md.h2 & mask;
                  pmac->u[3] |= key->md.h3 & mask;
                  pmac->u[4] |= key->md.h4 & mask;
                  res = 0;
              }
  
              for (i = res; i < SHA_CBLOCK; i++, j++)
                  data->c[i] = 0;
  
              if (res > SHA_CBLOCK - 8) {
                  mask = 0 - ((inp_len + 8 - j) >> (sizeof(j) * 8 - 1));
                  data->u[SHA_LBLOCK - 1] |= bitlen & mask;
                  sha1_block_data_order(&key->md, data, 1);
                  mask &= 0 - ((j - inp_len - 73) >> (sizeof(j) * 8 - 1));
                  pmac->u[0] |= key->md.h0 & mask;
                  pmac->u[1] |= key->md.h1 & mask;
                  pmac->u[2] |= key->md.h2 & mask;
                  pmac->u[3] |= key->md.h3 & mask;
                  pmac->u[4] |= key->md.h4 & mask;
  
                  memset(data, 0, SHA_CBLOCK);
                  j += 64;
              }
              data->u[SHA_LBLOCK - 1] = bitlen;
              sha1_block_data_order(&key->md, data, 1);
              mask = 0 - ((j - inp_len - 73) >> (sizeof(j) * 8 - 1));
              pmac->u[0] |= key->md.h0 & mask;
              pmac->u[1] |= key->md.h1 & mask;
              pmac->u[2] |= key->md.h2 & mask;
              pmac->u[3] |= key->md.h3 & mask;
              pmac->u[4] |= key->md.h4 & mask;
  
  #   ifdef BSWAP
              pmac->u[0] = BSWAP(pmac->u[0]);
              pmac->u[1] = BSWAP(pmac->u[1]);
              pmac->u[2] = BSWAP(pmac->u[2]);
              pmac->u[3] = BSWAP(pmac->u[3]);
              pmac->u[4] = BSWAP(pmac->u[4]);
  #   else
              for (i = 0; i < 5; 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 += SHA_DIGEST_LENGTH;
  #  else
              SHA1_Update(&key->md, out, inp_len);
              res = key->md.num;
              SHA1_Final(pmac->c, &key->md);
  
              {
                  unsigned int inp_blocks, pad_blocks;
  
                  /* but pretend as if we hashed padded payload */
                  inp_blocks =
                      1 + ((SHA_CBLOCK - 9 - res) >> (sizeof(res) * 8 - 1));
                  res += (unsigned int)(len - inp_len);
                  pad_blocks = res / SHA_CBLOCK;
                  res %= SHA_CBLOCK;
                  pad_blocks +=
                      1 + ((SHA_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;
              SHA1_Update(&key->md, pmac->c, SHA_DIGEST_LENGTH);
              SHA1_Final(pmac->c, &key->md);
  
              /* verify HMAC */
              out += inp_len;
              len -= inp_len;
  #  if 1
              {
                  unsigned char *p = out + len - 1 - maxpad - SHA_DIGEST_LENGTH;
                  size_t off = out - p;
                  unsigned int c, cmask;
  
                  maxpad += SHA_DIGEST_LENGTH;
                  for (res = 0, i = 0, j = 0; j < maxpad; j++) {
                      c = p[j];
                      cmask =
                          ((int)(j - off - SHA_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 -= SHA_DIGEST_LENGTH;
  
                  res = 0 - ((0 - res) >> (sizeof(res) * 8 - 1));
                  ret &= (int)~res;
              }
  #  else
              for (res = 0, i = 0; i < SHA_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 {
              SHA1_Update(&key->md, out, len);
          }
      }
  
      return 1;
  }
  
  static int aesni_cbc_hmac_sha1_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg,
                                      void *ptr)
  {
      EVP_AES_HMAC_SHA1 *key = data(ctx);
  
      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 > (int)sizeof(hmac_key)) {
                  SHA1_Init(&key->head);
                  SHA1_Update(&key->head, ptr, arg);
                  SHA1_Final(hmac_key, &key->head);
              } else {
                  memcpy(hmac_key, ptr, arg);
              }
  
              for (i = 0; i < sizeof(hmac_key); i++)
                  hmac_key[i] ^= 0x36; /* ipad */
              SHA1_Init(&key->head);
              SHA1_Update(&key->head, hmac_key, sizeof(hmac_key));
  
              for (i = 0; i < sizeof(hmac_key); i++)
                  hmac_key[i] ^= 0x36 ^ 0x5c; /* opad */
              SHA1_Init(&key->tail);
              SHA1_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;
  
              if (arg != EVP_AEAD_TLS1_AAD_LEN)
                  return -1;
   
              len = p[arg - 2] << 8 | p[arg - 1];
  
              if (ctx->encrypt) {
                  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;
                  SHA1_Update(&key->md, p, arg);
  
                  return (int)(((len + SHA_DIGEST_LENGTH +
                                 AES_BLOCK_SIZE) & -AES_BLOCK_SIZE)
                               - len);
              } else {
                  memcpy(key->aux.tls_aad, ptr, arg);
                  key->payload_length = arg;
  
                  return SHA_DIGEST_LENGTH;
              }
          }
      default:
          return -1;
      }
  }
  
  static EVP_CIPHER aesni_128_cbc_hmac_sha1_cipher = {
  #  ifdef NID_aes_128_cbc_hmac_sha1
      NID_aes_128_cbc_hmac_sha1,
  #  else
      NID_undef,
  #  endif
      16, 16, 16,
      EVP_CIPH_CBC_MODE | EVP_CIPH_FLAG_DEFAULT_ASN1 |
          EVP_CIPH_FLAG_AEAD_CIPHER,
      aesni_cbc_hmac_sha1_init_key,
      aesni_cbc_hmac_sha1_cipher,
      NULL,
      sizeof(EVP_AES_HMAC_SHA1),
      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_sha1_ctrl,
      NULL
  };
  
  static EVP_CIPHER aesni_256_cbc_hmac_sha1_cipher = {
  #  ifdef NID_aes_256_cbc_hmac_sha1
      NID_aes_256_cbc_hmac_sha1,
  #  else
      NID_undef,
  #  endif
      16, 32, 16,
      EVP_CIPH_CBC_MODE | EVP_CIPH_FLAG_DEFAULT_ASN1 |
          EVP_CIPH_FLAG_AEAD_CIPHER,
      aesni_cbc_hmac_sha1_init_key,
      aesni_cbc_hmac_sha1_cipher,
      NULL,
      sizeof(EVP_AES_HMAC_SHA1),
      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_sha1_ctrl,
      NULL
  };
  
  const EVP_CIPHER *EVP_aes_128_cbc_hmac_sha1(void)
  {
      return (OPENSSL_ia32cap_P[1] & AESNI_CAPABLE ?
              &aesni_128_cbc_hmac_sha1_cipher : NULL);
  }
  
  const EVP_CIPHER *EVP_aes_256_cbc_hmac_sha1(void)
  {
      return (OPENSSL_ia32cap_P[1] & AESNI_CAPABLE ?
              &aesni_256_cbc_hmac_sha1_cipher : NULL);
  }
  # else
  const EVP_CIPHER *EVP_aes_128_cbc_hmac_sha1(void)
  {
      return NULL;
  }
  
  const EVP_CIPHER *EVP_aes_256_cbc_hmac_sha1(void)
  {
      return NULL;
  }
  # endif
  #endif
  