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Add an HKDF (RFC 5869) implementation

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This commit is contained in:
Thomas Fossati 2016-07-17 08:51:22 +01:00 committed by Jaeden Amero
parent c4bd8ec5ed
commit 656864b360
15 changed files with 421 additions and 4 deletions
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6
include/mbedtls/check_config.h
View file

@ -4,7 +4,7 @@
* \brief Consistency checks for configuration options
*/
/*
* Copyright (C) 2006-2016, ARM Limited, All Rights Reserved
* Copyright (C) 2006-2018, ARM Limited, All Rights Reserved
* SPDX-License-Identifier: Apache-2.0
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may
@ -191,6 +191,10 @@
#error "MBEDTLS_HAVEGE_C defined, but not all prerequisites"
#endif
#if defined(MBEDTLS_HKDF_C) && !defined(MBEDTLS_MD_C)
#error "MBEDTLS_HKDF_C defined, but not all prerequisites"
#endif
#if defined(MBEDTLS_HMAC_DRBG_C) && !defined(MBEDTLS_MD_C)
#error "MBEDTLS_HMAC_DRBG_C defined, but not all prerequisites"
#endif

17
include/mbedtls/config.h
View file

@ -8,7 +8,7 @@
* memory footprint.
*/
/*
* Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
* Copyright (C) 2006-2018, ARM Limited, All Rights Reserved
* SPDX-License-Identifier: Apache-2.0
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may
@ -2091,6 +2091,21 @@
*/
//#define MBEDTLS_HAVEGE_C
/**
* \def MBEDTLS_HKDF_C
*
* Enable the HKDF algorithm (RFC 5869).
*
* Module: library/hkdf.c
* Caller:
*
* Requires: MBEDTLS_MD_C
*
* This module adds support for the Hashed Message Authentication Code
* (HMAC)-based key derivation function (HKDF).
*/
#define MBEDTLS_HKDF_C
/**
* \def MBEDTLS_HMAC_DRBG_C
*

3
include/mbedtls/error.h
View file

@ -4,7 +4,7 @@
* \brief Error to string translation
*/
/*
* Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
* Copyright (C) 2006-2018, ARM Limited, All Rights Reserved
* SPDX-License-Identifier: Apache-2.0
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may
@ -88,6 +88,7 @@
* RSA 4 11
* ECP 4 9 (Started from top)
* MD 5 5
* HKDF 5 1 (Started from top)
* CIPHER 6 8
* SSL 6 17 (Started from top)
* SSL 7 31

125
include/mbedtls/hkdf.h Normal file
View file

@ -0,0 +1,125 @@
/**
* \file hkdf.h
*
* \brief This file contains the HKDF interface.
*
* The HMAC-based Extract-and-Expand Key Derivation Function (HKDF) is
* specified by RFC 5869.
*/
/*
* Copyright (C) 2016-2018, ARM Limited, All Rights Reserved
* SPDX-License-Identifier: Apache-2.0
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* This file is part of mbed TLS (https://tls.mbed.org)
*/
#ifndef MBEDTLS_HKDF_H
#define MBEDTLS_HKDF_H
#include "md.h"
/**
* \name HKDF Error codes
* \{
*/
#define MBEDTLS_ERR_HKDF_BAD_INPUT_DATA -0x5F80 /**< Bad input parameters to function. */
/* \} name */
#ifdef __cplusplus
extern "C" {
#endif
/**
* \brief This is the HMAC-based Extract-and-Expand Key Derivation Function
* (HKDF).
*
* \param md A hash function; md.size denotes the length of the hash
* function output in bytes.
* \param salt An optional salt value (a non-secret random value);
* if the salt is not provided, a string of all zeros of
* md.size length is used as the salt.
* \param salt_len The length in bytes of the optional \p salt.
* \param ikm The input keying material.
* \param ikm_len The length in bytes of \p ikm.
* \param info An optional context and application specific information
* string. This can be a zero-length string.
* \param info_len The length of \p info in bytes.
* \param okm The output keying material of \p okm_len bytes.
* \param okm_len The length of the output keying material in bytes. This
* must be less than or equal to 255 * md.size bytes.
*
* \return 0 on success.
* \return #MBEDTLS_ERR_HKDF_BAD_INPUT_DATA when the parameters are invalid.
* \return An MBEDTLS_ERR_MD_* error for errors returned from the underlying
* MD layer.
*/
int mbedtls_hkdf( const mbedtls_md_info_t *md, const unsigned char *salt,
size_t salt_len, const unsigned char *ikm, size_t ikm_len,
const unsigned char *info, size_t info_len,
unsigned char *okm, size_t okm_len );
/**
* \brief Take the input keying material \p ikm and extract from it a
* fixed-length pseudorandom key \p prk.
*
* \param md A hash function; md.size denotes the length of the
* hash function output in bytes.
* \param salt An optional salt value (a non-secret random value);
* if the salt is not provided, a string of all zeros
* of md.size length is used as the salt.
* \param salt_len The length in bytes of the optional \p salt.
* \param ikm The input keying material.
* \param ikm_len The length in bytes of \p ikm.
* \param[out] prk A pseudorandom key of at least md.size bytes.
*
* \return 0 on success.
* \return #MBEDTLS_ERR_HKDF_BAD_INPUT_DATA when the parameters are invalid.
* \return An MBEDTLS_ERR_MD_* error for errors returned from the underlying
* MD layer.
*/
int mbedtls_hkdf_extract( const mbedtls_md_info_t *md,
const unsigned char *salt, size_t salt_len,
const unsigned char *ikm, size_t ikm_len,
unsigned char *prk );
/**
* \brief Expand the supplied \p prk into several additional pseudorandom
* keys, which is the output of the HKDF.
*
* \param md A hash function; md.size denotes the length of the hash
* function output in bytes.
* \param prk A pseudorandom key of at least md.size bytes. \p prk is usually,
* the output from the HKDF extract step.
* \param prk_len The length in bytes of \p prk.
* \param info An optional context and application specific information
* string. This can be a zero-length string.
* \param info_len The length of \p info in bytes.
* \param okm The output keying material of \p okm_len bytes.
* \param okm_len The length of the output keying material in bytes. This
* must be less than or equal to 255 * md.size bytes.
*
* \return 0 on success.
* \return #MBEDTLS_ERR_HKDF_BAD_INPUT_DATA when the parameters are invalid.
* \return An MBEDTLS_ERR_MD_* error for errors returned from the underlying
* MD layer.
*/
int mbedtls_hkdf_expand( const mbedtls_md_info_t *md, const unsigned char *prk,
size_t prk_len, const unsigned char *info,
size_t info_len, unsigned char *okm, size_t okm_len );
#ifdef __cplusplus
}
#endif
#endif /* hkdf.h */

1
library/CMakeLists.txt
View file

@ -29,6 +29,7 @@ set(src_crypto
error.c
gcm.c
havege.c
hkdf.c
hmac_drbg.c
md.c
md2.c

1
library/Makefile
View file

@ -56,6 +56,7 @@ OBJS_CRYPTO= aes.o aesni.o arc4.o \
ecjpake.o ecp.o \
ecp_curves.o entropy.o entropy_poll.o \
error.o gcm.o havege.o \
hkdf.o \
hmac_drbg.o md.o md2.o \
md4.o md5.o md_wrap.o \
memory_buffer_alloc.o oid.o \

9
library/error.c
View file

@ -101,6 +101,10 @@
#include "mbedtls/gcm.h"
#endif
#if defined(MBEDTLS_HKDF_C)
#include "mbedtls/hkdf.h"
#endif
#if defined(MBEDTLS_HMAC_DRBG_C)
#include "mbedtls/hmac_drbg.h"
#endif
@ -698,6 +702,11 @@ void mbedtls_strerror( int ret, char *buf, size_t buflen )
mbedtls_snprintf( buf, buflen, "GCM - Bad input parameters to function" );
#endif /* MBEDTLS_GCM_C */
#if defined(MBEDTLS_HKDF_C)
if( use_ret == -(MBEDTLS_ERR_HKDF_BAD_INPUT_DATA) )
mbedtls_snprintf( buf, buflen, "HKDF - Bad input parameters to function" );
#endif /* MBEDTLS_HKDF_C */
#if defined(MBEDTLS_HMAC_DRBG_C)
if( use_ret == -(MBEDTLS_ERR_HMAC_DRBG_REQUEST_TOO_BIG) )
mbedtls_snprintf( buf, buflen, "HMAC_DRBG - Too many random requested in single call" );

180
library/hkdf.c Normal file
View file

@ -0,0 +1,180 @@
/*
* HKDF implementation -- RFC 5869
*
* Copyright (C) 2016-2018, ARM Limited, All Rights Reserved
* SPDX-License-Identifier: Apache-2.0
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* This file is part of mbed TLS (https://tls.mbed.org)
*/
#if !defined(MBEDTLS_CONFIG_FILE)
#include "mbedtls/config.h"
#else
#include MBEDTLS_CONFIG_FILE
#endif
#if defined(MBEDTLS_HKDF_C)
#include <string.h>
#include "mbedtls/hkdf.h"
#include "mbedtls/platform_util.h"
int mbedtls_hkdf( const mbedtls_md_info_t *md, const unsigned char *salt,
size_t salt_len, const unsigned char *ikm, size_t ikm_len,
const unsigned char *info, size_t info_len,
unsigned char *okm, size_t okm_len )
{
int ret;
unsigned char prk[MBEDTLS_MD_MAX_SIZE];
ret = mbedtls_hkdf_extract( md, salt, salt_len, ikm, ikm_len, prk );
if( ret == 0 )
{
ret = mbedtls_hkdf_expand( md, prk, mbedtls_md_get_size( md ),
info, info_len, okm, okm_len );
}
mbedtls_platform_zeroize( prk, sizeof( prk ) );
return( ret );
}
int mbedtls_hkdf_extract( const mbedtls_md_info_t *md,
const unsigned char *salt, size_t salt_len,
const unsigned char *ikm, size_t ikm_len,
unsigned char *prk )
{
unsigned char null_salt[MBEDTLS_MD_MAX_SIZE] = { '\0' };
if( salt == NULL )
{
size_t hash_len;
hash_len = mbedtls_md_get_size( md );
if( hash_len == 0 )
{
return MBEDTLS_ERR_HKDF_BAD_INPUT_DATA;
}
salt = null_salt;
salt_len = hash_len;
}
return( mbedtls_md_hmac( md, salt, salt_len, ikm, ikm_len, prk ) );
}
int mbedtls_hkdf_expand( const mbedtls_md_info_t *md, const unsigned char *prk,
size_t prk_len, const unsigned char *info,
size_t info_len, unsigned char *okm, size_t okm_len )
{
size_t hash_len;
size_t where = 0;
size_t n;
size_t t_len = 0;
size_t i;
int ret = 0;
mbedtls_md_context_t ctx;
unsigned char t[MBEDTLS_MD_MAX_SIZE];
if( okm == NULL )
{
return( MBEDTLS_ERR_HKDF_BAD_INPUT_DATA );
}
hash_len = mbedtls_md_get_size( md );
if( prk_len < hash_len || hash_len == 0 )
{
return( MBEDTLS_ERR_HKDF_BAD_INPUT_DATA );
}
if( info == NULL )
{
info = (const unsigned char *) "";
info_len = 0;
}
n = okm_len / hash_len;
if( (okm_len % hash_len) != 0 )
{
n++;
}
if( n > 255 )
{
return( MBEDTLS_ERR_HKDF_BAD_INPUT_DATA );
}
mbedtls_md_init( &ctx );
if( (ret = mbedtls_md_setup( &ctx, md, 1) ) != 0 )
{
goto exit;
}
/* RFC 5869 Section 2.3. */
for( i = 1; i <= n; i++ )
{
size_t num_to_copy;
unsigned char c = i & 0xff;
ret = mbedtls_md_hmac_starts( &ctx, prk, prk_len );
if( ret != 0 )
{
goto exit;
}
ret = mbedtls_md_hmac_update( &ctx, t, t_len );
if( ret != 0 )
{
goto exit;
}
ret = mbedtls_md_hmac_update( &ctx, info, info_len );
if( ret != 0 )
{
goto exit;
}
/* The constant concatenated to the end of each t(n) is a single octet.
* */
ret = mbedtls_md_hmac_update( &ctx, &c, 1 );
if( ret != 0 )
{
goto exit;
}
ret = mbedtls_md_hmac_finish( &ctx, t );
if( ret != 0 )
{
goto exit;
}
num_to_copy = i != n ? hash_len : okm_len - where;
memcpy( okm + where, t, num_to_copy );
where += hash_len;
t_len = hash_len;
}
exit:
mbedtls_md_free( &ctx );
mbedtls_platform_zeroize( t, sizeof( t ) );
return( ret );
}
#endif /* MBEDTLS_HKDF_C */

3
library/version_features.c
View file

@ -579,6 +579,9 @@ static const char *features[] = {
#if defined(MBEDTLS_HAVEGE_C)
"MBEDTLS_HAVEGE_C",
#endif /* MBEDTLS_HAVEGE_C */
#if defined(MBEDTLS_HKDF_C)
"MBEDTLS_HKDF_C",
#endif /* MBEDTLS_HKDF_C */
#if defined(MBEDTLS_HMAC_DRBG_C)
"MBEDTLS_HMAC_DRBG_C",
#endif /* MBEDTLS_HMAC_DRBG_C */

2
scripts/generate_errors.pl
View file

@ -31,7 +31,7 @@ my $error_format_file = $data_dir.'/error.fmt';
my @low_level_modules = qw( AES ARC4 ASN1 BASE64 BIGNUM BLOWFISH
CAMELLIA CCM CMAC CTR_DRBG DES
ENTROPY GCM HMAC_DRBG MD2 MD4 MD5
ENTROPY GCM HKDF HMAC_DRBG MD2 MD4 MD5
NET OID PADLOCK PBKDF2 RIPEMD160
SHA1 SHA256 SHA512 THREADING XTEA );
my @high_level_modules = qw( CIPHER DHM ECP MD

1
tests/CMakeLists.txt
View file

@ -81,6 +81,7 @@ add_test_suite(gcm gcm.aes128_de)
add_test_suite(gcm gcm.aes192_de)
add_test_suite(gcm gcm.aes256_de)
add_test_suite(gcm gcm.camellia)
add_test_suite(hkdf)
add_test_suite(hmac_drbg hmac_drbg.misc)
add_test_suite(hmac_drbg hmac_drbg.no_reseed)
add_test_suite(hmac_drbg hmac_drbg.nopr)

9
tests/Makefile
View file

@ -70,6 +70,7 @@ APPS = test_suite_aes.ecb$(EXEXT) test_suite_aes.cbc$(EXEXT) \
test_suite_gcm.aes192_en$(EXEXT) \
test_suite_gcm.aes256_en$(EXEXT) \
test_suite_gcm.camellia$(EXEXT) \
test_suite_hkdf$(EXEXT) \
test_suite_hmac_drbg.misc$(EXEXT) \
test_suite_hmac_drbg.no_reseed$(EXEXT) \
test_suite_hmac_drbg.nopr$(EXEXT) \
@ -177,6 +178,10 @@ test_suite_gcm.camellia.c : suites/test_suite_gcm.function suites/test_suite_gcm
echo " Gen $@"
perl scripts/generate_code.pl suites test_suite_gcm test_suite_gcm.camellia
test_suite_hkdf.c : suites/test_suite_hkdf.function suites/test_suite_hkdf.data scripts/generate_code.pl suites/helpers.function suites/main_test.function
echo " Gen $@"
perl scripts/generate_code.pl suites test_suite_hkdf test_suite_hkdf
test_suite_hmac_drbg.misc.c : suites/test_suite_hmac_drbg.function suites/test_suite_hmac_drbg.misc.data scripts/generate_code.pl suites/helpers.function suites/main_test.function
echo " Gen $@"
perl scripts/generate_code.pl suites test_suite_hmac_drbg test_suite_hmac_drbg.misc
@ -341,6 +346,10 @@ test_suite_gcm.camellia$(EXEXT): test_suite_gcm.camellia.c $(DEP)
echo " CC $<"
$(CC) $(LOCAL_CFLAGS) $(CFLAGS) $< $(LOCAL_LDFLAGS) $(LDFLAGS) -o $@
test_suite_hkdf$(EXEXT): test_suite_hkdf.c $(DEP)
echo " CC $<"
$(CC) $(LOCAL_CFLAGS) $(CFLAGS) $< $(LOCAL_LDFLAGS) $(LDFLAGS) -o $@
test_suite_hmac_drbg.misc$(EXEXT): test_suite_hmac_drbg.misc.c $(DEP)
echo " CC $<"
$(CC) $(LOCAL_CFLAGS) $(CFLAGS) $< $(LOCAL_LDFLAGS) $(LDFLAGS) -o $@

27
tests/suites/test_suite_hkdf.data Normal file
View file

@ -0,0 +1,27 @@
HKDF RFC5869 Test Vector #1
depends_on:MBEDTLS_SHA256_C
test_hkdf:6:"0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b":"000102030405060708090a0b0c":"f0f1f2f3f4f5f6f7f8f9":"3cb25f25faacd57a90434f64d0362f2a2d2d0a90cf1a5a4c5db02d56ecc4c5bf34007208d5b887185865"
HKDF RFC5869 Test Vector #2
depends_on:MBEDTLS_SHA256_C
test_hkdf:6:"000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f202122232425262728292a2b2c2d2e2f303132333435363738393a3b3c3d3e3f404142434445464748494a4b4c4d4e4f":"606162636465666768696a6b6c6d6e6f707172737475767778797a7b7c7d7e7f808182838485868788898a8b8c8d8e8f909192939495969798999a9b9c9d9e9fa0a1a2a3a4a5a6a7a8a9aaabacadaeaf":"b0b1b2b3b4b5b6b7b8b9babbbcbdbebfc0c1c2c3c4c5c6c7c8c9cacbcccdcecfd0d1d2d3d4d5d6d7d8d9dadbdcdddedfe0e1e2e3e4e5e6e7e8e9eaebecedeeeff0f1f2f3f4f5f6f7f8f9fafbfcfdfeff":"b11e398dc80327a1c8e7f78c596a49344f012eda2d4efad8a050cc4c19afa97c59045a99cac7827271cb41c65e590e09da3275600c2f09b8367793a9aca3db71cc30c58179ec3e87c14c01d5c1f3434f1d87"
HKDF RFC5869 Test Vector #3
depends_on:MBEDTLS_SHA256_C
test_hkdf:6:"0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b":"":"":"8da4e775a563c18f715f802a063c5a31b8a11f5c5ee1879ec3454e5f3c738d2d9d201395faa4b61a96c8"
HKDF RFC5869 Test Vector #4
depends_on:MBEDTLS_SHA1_C
test_hkdf:4:"0b0b0b0b0b0b0b0b0b0b0b":"000102030405060708090a0b0c":"f0f1f2f3f4f5f6f7f8f9":"085a01ea1b10f36933068b56efa5ad81a4f14b822f5b091568a9cdd4f155fda2c22e422478d305f3f896"
HKDF RFC5869 Test Vector #5
depends_on:MBEDTLS_SHA1_C
test_hkdf:4:"000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f202122232425262728292a2b2c2d2e2f303132333435363738393a3b3c3d3e3f404142434445464748494a4b4c4d4e4f":"606162636465666768696a6b6c6d6e6f707172737475767778797a7b7c7d7e7f808182838485868788898a8b8c8d8e8f909192939495969798999a9b9c9d9e9fa0a1a2a3a4a5a6a7a8a9aaabacadaeaf":"b0b1b2b3b4b5b6b7b8b9babbbcbdbebfc0c1c2c3c4c5c6c7c8c9cacbcccdcecfd0d1d2d3d4d5d6d7d8d9dadbdcdddedfe0e1e2e3e4e5e6e7e8e9eaebecedeeeff0f1f2f3f4f5f6f7f8f9fafbfcfdfeff":"0bd770a74d1160f7c9f12cd5912a06ebff6adcae899d92191fe4305673ba2ffe8fa3f1a4e5ad79f3f334b3b202b2173c486ea37ce3d397ed034c7f9dfeb15c5e927336d0441f4c4300e2cff0d0900b52d3b4"
HKDF RFC5869 Test Vector #6
depends_on:MBEDTLS_SHA1_C
test_hkdf:4:"0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b":"":"":"0ac1af7002b3d761d1e55298da9d0506b9ae52057220a306e07b6b87e8df21d0ea00033de03984d34918"
HKDF RFC5869 Test Vector #7
depends_on:MBEDTLS_SHA1_C
test_hkdf:4:"0c0c0c0c0c0c0c0c0c0c0c0c0c0c0c0c0c0c0c0c0c0c":"":"":"2c91117204d745f3500d636a62f64f0ab3bae548aa53d423b0d1f27ebba6f5e5673a081d70cce7acfc48"

39
tests/suites/test_suite_hkdf.function Normal file
View file

@ -0,0 +1,39 @@
/* BEGIN_HEADER */
#include "mbedtls/hkdf.h"
/* END_HEADER */
/* BEGIN_DEPENDENCIES
* depends_on:MBEDTLS_HKDF_C
* END_DEPENDENCIES
*/
/* BEGIN_CASE */
void test_hkdf( int md_alg, char *hex_ikm_string, char *hex_salt_string,
char *hex_info_string, char *hex_okm_string )
{
int ret;
size_t ikm_len, salt_len, info_len, okm_len;
unsigned char ikm[1024] = { '\0' };
unsigned char salt[1024] = { '\0' };
unsigned char info[1024] = { '\0' };
unsigned char expected_okm[1024] = { '\0' };
unsigned char okm[1024] = { '\0' };
unsigned char okm_string[1000] = { '\0' };
const mbedtls_md_info_t *md = mbedtls_md_info_from_type( md_alg );
TEST_ASSERT( md != NULL );
ikm_len = unhexify( ikm, hex_ikm_string );
salt_len = unhexify( salt, hex_salt_string );
info_len = unhexify( info, hex_info_string );
okm_len = unhexify( expected_okm, hex_okm_string );
ret = mbedtls_hkdf( md, salt, salt_len, ikm, ikm_len, info, info_len, okm,
okm_len);
TEST_ASSERT( ret == 0 );
// Run hexify on it so that it looks nicer if the assertion fails
hexify( okm_string, okm, okm_len );
TEST_ASSERT( !strcmp( (char *)okm_string, hex_okm_string ) );
}
/* END_CASE */

2
visualc/VS2010/mbedTLS.vcxproj
View file

@ -178,6 +178,7 @@
<ClInclude Include="..\..\include\mbedtls\error.h" />
<ClInclude Include="..\..\include\mbedtls\gcm.h" />
<ClInclude Include="..\..\include\mbedtls\havege.h" />
<ClInclude Include="..\..\include\mbedtls\hkdf.h" />
<ClInclude Include="..\..\include\mbedtls\hmac_drbg.h" />
<ClInclude Include="..\..\include\mbedtls\md.h" />
<ClInclude Include="..\..\include\mbedtls\md2.h" />
@ -248,6 +249,7 @@
<ClCompile Include="..\..\library\error.c" />
<ClCompile Include="..\..\library\gcm.c" />
<ClCompile Include="..\..\library\havege.c" />
<ClCompile Include="..\..\library\hkdf.c" />
<ClCompile Include="..\..\library\hmac_drbg.c" />
<ClCompile Include="..\..\library\md.c" />
<ClCompile Include="..\..\library\md2.c" />