text: /* MIT License
   *
   * Copyright (c) 2016-2020 INRIA, CMU and Microsoft Corporation
   *
   * Permission is hereby granted, free of charge, to any person obtaining a copy
   * of this software and associated documentation files (the "Software"), to deal
   * in the Software without restriction, including without limitation the rights
   * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   * copies of the Software, and to permit persons to whom the Software is
   * furnished to do so, subject to the following conditions:
   *
   * The above copyright notice and this permission notice shall be included in all
   * copies or substantial portions of the Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
   * SOFTWARE.
   */
  
  
  #include "EverCrypt_HKDF.h"
  
  /* SNIPPET_START: EverCrypt_HKDF_expand_sha1 */
  
  void
  EverCrypt_HKDF_expand_sha1(
    uint8_t *okm,
    uint8_t *prk,
    uint32_t prklen,
    uint8_t *info,
    uint32_t infolen,
    uint32_t len
  )
  {
    uint32_t tlen = (uint32_t)20U;
    uint32_t n1 = len / tlen;
    uint8_t *output = okm;
    KRML_CHECK_SIZE(sizeof (uint8_t), tlen + infolen + (uint32_t)1U);
    uint8_t text[tlen + infolen + (uint32_t)1U];
    memset(text, 0U, (tlen + infolen + (uint32_t)1U) * sizeof text[0U]);
    uint8_t *text0 = text + tlen;
    uint8_t *tag = text;
    uint8_t *ctr = text + tlen + infolen;
    memcpy(text + tlen, info, infolen * sizeof info[0U]);
    for (uint32_t i = (uint32_t)0U; i < n1; i = i + (uint32_t)1U)
    {
      ctr[0U] = (uint8_t)(i + (uint32_t)1U);
      if (i == (uint32_t)0U)
      {
        EverCrypt_HMAC_compute_sha1(tag, prk, prklen, text0, infolen + (uint32_t)1U);
      }
      else
      {
        EverCrypt_HMAC_compute_sha1(tag, prk, prklen, text, tlen + infolen + (uint32_t)1U);
      }
      memcpy(output + i * tlen, tag, tlen * sizeof tag[0U]);
    }
    if (n1 * tlen < len)
    {
      ctr[0U] = (uint8_t)(n1 + (uint32_t)1U);
      if (n1 == (uint32_t)0U)
      {
        EverCrypt_HMAC_compute_sha1(tag, prk, prklen, text0, infolen + (uint32_t)1U);
      }
      else
      {
        EverCrypt_HMAC_compute_sha1(tag, prk, prklen, text, tlen + infolen + (uint32_t)1U);
      }
      uint8_t *block = okm + n1 * tlen;
      memcpy(block, tag, (len - n1 * tlen) * sizeof tag[0U]);
    }
  }
  
  /* SNIPPET_END: EverCrypt_HKDF_expand_sha1 */
  
  /* SNIPPET_START: EverCrypt_HKDF_extract_sha1 */
  
  void
  EverCrypt_HKDF_extract_sha1(
    uint8_t *prk,
    uint8_t *salt,
    uint32_t saltlen,
    uint8_t *ikm,
    uint32_t ikmlen
  )
  {
    EverCrypt_HMAC_compute_sha1(prk, salt, saltlen, ikm, ikmlen);
  }
  
  /* SNIPPET_END: EverCrypt_HKDF_extract_sha1 */
  
  /* SNIPPET_START: EverCrypt_HKDF_expand_sha2_256 */
  
  void
  EverCrypt_HKDF_expand_sha2_256(
    uint8_t *okm,
    uint8_t *prk,
    uint32_t prklen,
    uint8_t *info,
    uint32_t infolen,
    uint32_t len
  )
  {
    uint32_t tlen = (uint32_t)32U;
    uint32_t n1 = len / tlen;
    uint8_t *output = okm;
    KRML_CHECK_SIZE(sizeof (uint8_t), tlen + infolen + (uint32_t)1U);
    uint8_t text[tlen + infolen + (uint32_t)1U];
    memset(text, 0U, (tlen + infolen + (uint32_t)1U) * sizeof text[0U]);
    uint8_t *text0 = text + tlen;
    uint8_t *tag = text;
    uint8_t *ctr = text + tlen + infolen;
    memcpy(text + tlen, info, infolen * sizeof info[0U]);
    for (uint32_t i = (uint32_t)0U; i < n1; i = i + (uint32_t)1U)
    {
      ctr[0U] = (uint8_t)(i + (uint32_t)1U);
      if (i == (uint32_t)0U)
      {
        EverCrypt_HMAC_compute_sha2_256(tag, prk, prklen, text0, infolen + (uint32_t)1U);
      }
      else
      {
        EverCrypt_HMAC_compute_sha2_256(tag, prk, prklen, text, tlen + infolen + (uint32_t)1U);
      }
      memcpy(output + i * tlen, tag, tlen * sizeof tag[0U]);
    }
    if (n1 * tlen < len)
    {
      ctr[0U] = (uint8_t)(n1 + (uint32_t)1U);
      if (n1 == (uint32_t)0U)
      {
        EverCrypt_HMAC_compute_sha2_256(tag, prk, prklen, text0, infolen + (uint32_t)1U);
      }
      else
      {
        EverCrypt_HMAC_compute_sha2_256(tag, prk, prklen, text, tlen + infolen + (uint32_t)1U);
      }
      uint8_t *block = okm + n1 * tlen;
      memcpy(block, tag, (len - n1 * tlen) * sizeof tag[0U]);
    }
  }
  
  /* SNIPPET_END: EverCrypt_HKDF_expand_sha2_256 */
  
  /* SNIPPET_START: EverCrypt_HKDF_extract_sha2_256 */
  
  void
  EverCrypt_HKDF_extract_sha2_256(
    uint8_t *prk,
    uint8_t *salt,
    uint32_t saltlen,
    uint8_t *ikm,
    uint32_t ikmlen
  )
  {
    EverCrypt_HMAC_compute_sha2_256(prk, salt, saltlen, ikm, ikmlen);
  }
  
  /* SNIPPET_END: EverCrypt_HKDF_extract_sha2_256 */
  
  /* SNIPPET_START: EverCrypt_HKDF_expand_sha2_384 */
  
  void
  EverCrypt_HKDF_expand_sha2_384(
    uint8_t *okm,
    uint8_t *prk,
    uint32_t prklen,
    uint8_t *info,
    uint32_t infolen,
    uint32_t len
  )
  {
    uint32_t tlen = (uint32_t)48U;
    uint32_t n1 = len / tlen;
    uint8_t *output = okm;
    KRML_CHECK_SIZE(sizeof (uint8_t), tlen + infolen + (uint32_t)1U);
    uint8_t text[tlen + infolen + (uint32_t)1U];
    memset(text, 0U, (tlen + infolen + (uint32_t)1U) * sizeof text[0U]);
    uint8_t *text0 = text + tlen;
    uint8_t *tag = text;
    uint8_t *ctr = text + tlen + infolen;
    memcpy(text + tlen, info, infolen * sizeof info[0U]);
    for (uint32_t i = (uint32_t)0U; i < n1; i = i + (uint32_t)1U)
    {
      ctr[0U] = (uint8_t)(i + (uint32_t)1U);
      if (i == (uint32_t)0U)
      {
        EverCrypt_HMAC_compute_sha2_384(tag, prk, prklen, text0, infolen + (uint32_t)1U);
      }
      else
      {
        EverCrypt_HMAC_compute_sha2_384(tag, prk, prklen, text, tlen + infolen + (uint32_t)1U);
      }
      memcpy(output + i * tlen, tag, tlen * sizeof tag[0U]);
    }
    if (n1 * tlen < len)
    {
      ctr[0U] = (uint8_t)(n1 + (uint32_t)1U);
      if (n1 == (uint32_t)0U)
      {
        EverCrypt_HMAC_compute_sha2_384(tag, prk, prklen, text0, infolen + (uint32_t)1U);
      }
      else
      {
        EverCrypt_HMAC_compute_sha2_384(tag, prk, prklen, text, tlen + infolen + (uint32_t)1U);
      }
      uint8_t *block = okm + n1 * tlen;
      memcpy(block, tag, (len - n1 * tlen) * sizeof tag[0U]);
    }
  }
  
  /* SNIPPET_END: EverCrypt_HKDF_expand_sha2_384 */
  
  /* SNIPPET_START: EverCrypt_HKDF_extract_sha2_384 */
  
  void
  EverCrypt_HKDF_extract_sha2_384(
    uint8_t *prk,
    uint8_t *salt,
    uint32_t saltlen,
    uint8_t *ikm,
    uint32_t ikmlen
  )
  {
    EverCrypt_HMAC_compute_sha2_384(prk, salt, saltlen, ikm, ikmlen);
  }
  
  /* SNIPPET_END: EverCrypt_HKDF_extract_sha2_384 */
  
  /* SNIPPET_START: EverCrypt_HKDF_expand_sha2_512 */
  
  void
  EverCrypt_HKDF_expand_sha2_512(
    uint8_t *okm,
    uint8_t *prk,
    uint32_t prklen,
    uint8_t *info,
    uint32_t infolen,
    uint32_t len
  )
  {
    uint32_t tlen = (uint32_t)64U;
    uint32_t n1 = len / tlen;
    uint8_t *output = okm;
    KRML_CHECK_SIZE(sizeof (uint8_t), tlen + infolen + (uint32_t)1U);
    uint8_t text[tlen + infolen + (uint32_t)1U];
    memset(text, 0U, (tlen + infolen + (uint32_t)1U) * sizeof text[0U]);
    uint8_t *text0 = text + tlen;
    uint8_t *tag = text;
    uint8_t *ctr = text + tlen + infolen;
    memcpy(text + tlen, info, infolen * sizeof info[0U]);
    for (uint32_t i = (uint32_t)0U; i < n1; i = i + (uint32_t)1U)
    {
      ctr[0U] = (uint8_t)(i + (uint32_t)1U);
      if (i == (uint32_t)0U)
      {
        EverCrypt_HMAC_compute_sha2_512(tag, prk, prklen, text0, infolen + (uint32_t)1U);
      }
      else
      {
        EverCrypt_HMAC_compute_sha2_512(tag, prk, prklen, text, tlen + infolen + (uint32_t)1U);
      }
      memcpy(output + i * tlen, tag, tlen * sizeof tag[0U]);
    }
    if (n1 * tlen < len)
    {
      ctr[0U] = (uint8_t)(n1 + (uint32_t)1U);
      if (n1 == (uint32_t)0U)
      {
        EverCrypt_HMAC_compute_sha2_512(tag, prk, prklen, text0, infolen + (uint32_t)1U);
      }
      else
      {
        EverCrypt_HMAC_compute_sha2_512(tag, prk, prklen, text, tlen + infolen + (uint32_t)1U);
      }
      uint8_t *block = okm + n1 * tlen;
      memcpy(block, tag, (len - n1 * tlen) * sizeof tag[0U]);
    }
  }
  
  /* SNIPPET_END: EverCrypt_HKDF_expand_sha2_512 */
  
  /* SNIPPET_START: EverCrypt_HKDF_extract_sha2_512 */
  
  void
  EverCrypt_HKDF_extract_sha2_512(
    uint8_t *prk,
    uint8_t *salt,
    uint32_t saltlen,
    uint8_t *ikm,
    uint32_t ikmlen
  )
  {
    EverCrypt_HMAC_compute_sha2_512(prk, salt, saltlen, ikm, ikmlen);
  }
  
  /* SNIPPET_END: EverCrypt_HKDF_extract_sha2_512 */
  
  /* SNIPPET_START: EverCrypt_HKDF_expand */
  
  void
  EverCrypt_HKDF_expand(
    Spec_Hash_Definitions_hash_alg a,
    uint8_t *okm,
    uint8_t *prk,
    uint32_t prklen,
    uint8_t *info,
    uint32_t infolen,
    uint32_t len
  )
  {
    switch (a)
    {
      case Spec_Hash_Definitions_SHA1:
        {
          EverCrypt_HKDF_expand_sha1(okm, prk, prklen, info, infolen, len);
          break;
        }
      case Spec_Hash_Definitions_SHA2_256:
        {
          EverCrypt_HKDF_expand_sha2_256(okm, prk, prklen, info, infolen, len);
          break;
        }
      case Spec_Hash_Definitions_SHA2_384:
        {
          EverCrypt_HKDF_expand_sha2_384(okm, prk, prklen, info, infolen, len);
          break;
        }
      case Spec_Hash_Definitions_SHA2_512:
        {
          EverCrypt_HKDF_expand_sha2_512(okm, prk, prklen, info, infolen, len);
          break;
        }
      default:
        {
          KRML_HOST_EPRINTF("KreMLin incomplete match at %s:%d\n", __FILE__, __LINE__);
          KRML_HOST_EXIT(253U);
        }
    }
  }
  
  /* SNIPPET_END: EverCrypt_HKDF_expand */
  
  /* SNIPPET_START: EverCrypt_HKDF_extract */
  
  void
  EverCrypt_HKDF_extract(
    Spec_Hash_Definitions_hash_alg a,
    uint8_t *prk,
    uint8_t *salt,
    uint32_t saltlen,
    uint8_t *ikm,
    uint32_t ikmlen
  )
  {
    switch (a)
    {
      case Spec_Hash_Definitions_SHA1:
        {
          EverCrypt_HKDF_extract_sha1(prk, salt, saltlen, ikm, ikmlen);
          break;
        }
      case Spec_Hash_Definitions_SHA2_256:
        {
          EverCrypt_HKDF_extract_sha2_256(prk, salt, saltlen, ikm, ikmlen);
          break;
        }
      case Spec_Hash_Definitions_SHA2_384:
        {
          EverCrypt_HKDF_extract_sha2_384(prk, salt, saltlen, ikm, ikmlen);
          break;
        }
      case Spec_Hash_Definitions_SHA2_512:
        {
          EverCrypt_HKDF_extract_sha2_512(prk, salt, saltlen, ikm, ikmlen);
          break;
        }
      default:
        {
          KRML_HOST_EPRINTF("KreMLin incomplete match at %s:%d\n", __FILE__, __LINE__);
          KRML_HOST_EXIT(253U);
        }
    }
  }
  
  /* SNIPPET_END: EverCrypt_HKDF_extract */
  
  /* SNIPPET_START: EverCrypt_HKDF_hkdf_expand */
  
  KRML_DEPRECATED("expand")
  
  void
  EverCrypt_HKDF_hkdf_expand(
    Spec_Hash_Definitions_hash_alg a,
    uint8_t *okm,
    uint8_t *prk,
    uint32_t prklen,
    uint8_t *info,
    uint32_t infolen,
    uint32_t len
  )
  {
    EverCrypt_HKDF_expand(a, okm, prk, prklen, info, infolen, len);
  }
  
  /* SNIPPET_END: EverCrypt_HKDF_hkdf_expand */
  
  /* SNIPPET_START: EverCrypt_HKDF_hkdf_extract */
  
  KRML_DEPRECATED("extract")
  
  void
  EverCrypt_HKDF_hkdf_extract(
    Spec_Hash_Definitions_hash_alg a,
    uint8_t *prk,
    uint8_t *salt,
    uint32_t saltlen,
    uint8_t *ikm,
    uint32_t ikmlen
  )
  {
    EverCrypt_HKDF_extract(a, prk, salt, saltlen, ikm, ikmlen);
  }
  
  /* SNIPPET_END: EverCrypt_HKDF_hkdf_extract */
  
  