Revision 1990ae634d0602ff022afc946ef66933e4e4a2dc authored by Santiago Zanella-Beguelin on 09 December 2019, 17:48:55 UTC, committed by Santiago Zanella-Beguelin on 09 December 2019, 17:50:10 UTC
1 parent ae8e182
Hacl_HKDF.c
/* 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 "Hacl_HKDF.h"
void
Hacl_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]);
{
uint32_t i;
for (i = (uint32_t)0U; i < n1; i = i + (uint32_t)1U)
{
ctr[0U] = (uint8_t)(i + (uint32_t)1U);
if (i == (uint32_t)0U)
{
Hacl_HMAC_compute_sha2_256(tag, prk, prklen, text0, infolen + (uint32_t)1U);
}
else
{
Hacl_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)
{
Hacl_HMAC_compute_sha2_256(tag, prk, prklen, text0, infolen + (uint32_t)1U);
}
else
{
Hacl_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]);
}
}
}
}
}
void
Hacl_HKDF_extract_sha2_256(
uint8_t *prk,
uint8_t *salt,
uint32_t saltlen,
uint8_t *ikm,
uint32_t ikmlen
)
{
Hacl_HMAC_compute_sha2_256(prk, salt, saltlen, ikm, ikmlen);
}
void
Hacl_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]);
{
uint32_t i;
for (i = (uint32_t)0U; i < n1; i = i + (uint32_t)1U)
{
ctr[0U] = (uint8_t)(i + (uint32_t)1U);
if (i == (uint32_t)0U)
{
Hacl_HMAC_compute_sha2_512(tag, prk, prklen, text0, infolen + (uint32_t)1U);
}
else
{
Hacl_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)
{
Hacl_HMAC_compute_sha2_512(tag, prk, prklen, text0, infolen + (uint32_t)1U);
}
else
{
Hacl_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]);
}
}
}
}
}
void
Hacl_HKDF_extract_sha2_512(
uint8_t *prk,
uint8_t *salt,
uint32_t saltlen,
uint8_t *ikm,
uint32_t ikmlen
)
{
Hacl_HMAC_compute_sha2_512(prk, salt, saltlen, ikm, ikmlen);
}
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