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e71ad12cd5
mbedtls/library/dhm.c
Hanno Becker e71ad12cd5 Minor code-improvements in dhm.c
2017-09-28 11:06:31 +01:00

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/*
* Diffie-Hellman-Merkle key exchange
*
* Copyright (C) 2006-2015, 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)
*/
/*
* The following sources were referenced in the design of this implementation
* of the Diffie-Hellman-Merkle algorithm:
*
* [1] Handbook of Applied Cryptography - 1997, Chapter 12
* Menezes, van Oorschot and Vanstone
*
*/
#if !defined(MBEDTLS_CONFIG_FILE)
#include "mbedtls/config.h"
#else
#include MBEDTLS_CONFIG_FILE
#endif
#if defined(MBEDTLS_DHM_C)
#include "mbedtls/dhm.h"
#include <string.h>
#if defined(MBEDTLS_PEM_PARSE_C)
#include "mbedtls/pem.h"
#endif
#if defined(MBEDTLS_ASN1_PARSE_C)
#include "mbedtls/asn1.h"
#endif
#if defined(MBEDTLS_PLATFORM_C)
#include "mbedtls/platform.h"
#else
#include <stdlib.h>
#include <stdio.h>
#define mbedtls_printf printf
#define mbedtls_calloc calloc
#define mbedtls_free free
#endif
/*
* Diffie-Hellman groups from RFC 5114
*
* \warning The origin of the primes in RFC 5114 is not documented and
* their use therefore constitutes a security risk!
*
* \deprecated The primes from RFC 5114 are superseded by the primes
* from RFC 3526 and RFC 7919 and should no longer be used.
* They will be removed in the next major version.
*/
const char * const mbedtls_dhm_rfc5114_modp_2048_p =
"AD107E1E9123A9D0D660FAA79559C51FA20D64E5683B9FD1"
"B54B1597B61D0A75E6FA141DF95A56DBAF9A3C407BA1DF15"
"EB3D688A309C180E1DE6B85A1274A0A66D3F8152AD6AC212"
"9037C9EDEFDA4DF8D91E8FEF55B7394B7AD5B7D0B6C12207"
"C9F98D11ED34DBF6C6BA0B2C8BBC27BE6A00E0A0B9C49708"
"B3BF8A317091883681286130BC8985DB1602E714415D9330"
"278273C7DE31EFDC7310F7121FD5A07415987D9ADC0A486D"
"CDF93ACC44328387315D75E198C641A480CD86A1B9E587E8"
"BE60E69CC928B2B9C52172E413042E9B23F10B0E16E79763"
"C9B53DCF4BA80A29E3FB73C16B8E75B97EF363E2FFA31F71"
"CF9DE5384E71B81C0AC4DFFE0C10E64F";
const char * const mbedtls_dhm_rfc5114_modp_2048_g =
"AC4032EF4F2D9AE39DF30B5C8FFDAC506CDEBE7B89998CAF"
"74866A08CFE4FFE3A6824A4E10B9A6F0DD921F01A70C4AFA"
"AB739D7700C29F52C57DB17C620A8652BE5E9001A8D66AD7"
"C17669101999024AF4D027275AC1348BB8A762D0521BC98A"
"E247150422EA1ED409939D54DA7460CDB5F6C6B250717CBE"
"F180EB34118E98D119529A45D6F834566E3025E316A330EF"
"BB77A86F0C1AB15B051AE3D428C8F8ACB70A8137150B8EEB"
"10E183EDD19963DDD9E263E4770589EF6AA21E7F5F2FF381"
"B539CCE3409D13CD566AFBB48D6C019181E1BCFE94B30269"
"EDFE72FE9B6AA4BD7B5A0F1C71CFFF4C19C418E1F6EC0179"
"81BC087F2A7065B384B890D3191F2BFA";
/*
* Diffie-Hellman groups from RFC 3526
*/
const char * const mbedtls_dhm_rfc3526_modp_2048_p =
"FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD1"
"29024E088A67CC74020BBEA63B139B22514A08798E3404DD"
"EF9519B3CD3A431B302B0A6DF25F14374FE1356D6D51C245"
"E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7ED"
"EE386BFB5A899FA5AE9F24117C4B1FE649286651ECE45B3D"
"C2007CB8A163BF0598DA48361C55D39A69163FA8FD24CF5F"
"83655D23DCA3AD961C62F356208552BB9ED529077096966D"
"670C354E4ABC9804F1746C08CA18217C32905E462E36CE3B"
"E39E772C180E86039B2783A2EC07A28FB5C55DF06F4C52C9"
"DE2BCBF6955817183995497CEA956AE515D2261898FA0510"
"15728E5A8AACAA68FFFFFFFFFFFFFFFF";
const char * const mbedtls_dhm_rfc3526_modp_2048_g = "02";
const char * const mbedtls_dhm_rfc3526_modp_3072_p =
"FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD1"
"29024E088A67CC74020BBEA63B139B22514A08798E3404DD"
"EF9519B3CD3A431B302B0A6DF25F14374FE1356D6D51C245"
"E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7ED"
"EE386BFB5A899FA5AE9F24117C4B1FE649286651ECE45B3D"
"C2007CB8A163BF0598DA48361C55D39A69163FA8FD24CF5F"
"83655D23DCA3AD961C62F356208552BB9ED529077096966D"
"670C354E4ABC9804F1746C08CA18217C32905E462E36CE3B"
"E39E772C180E86039B2783A2EC07A28FB5C55DF06F4C52C9"
"DE2BCBF6955817183995497CEA956AE515D2261898FA0510"
"15728E5A8AAAC42DAD33170D04507A33A85521ABDF1CBA64"
"ECFB850458DBEF0A8AEA71575D060C7DB3970F85A6E1E4C7"
"ABF5AE8CDB0933D71E8C94E04A25619DCEE3D2261AD2EE6B"
"F12FFA06D98A0864D87602733EC86A64521F2B18177B200C"
"BBE117577A615D6C770988C0BAD946E208E24FA074E5AB31"
"43DB5BFCE0FD108E4B82D120A93AD2CAFFFFFFFFFFFFFFFF";
const char * const mbedtls_dhm_rfc3526_modp_3072_g = "02";
const char * const mbedtls_dhm_rfc3526_modp_4096_p =
"FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD1"
"29024E088A67CC74020BBEA63B139B22514A08798E3404DD"
"EF9519B3CD3A431B302B0A6DF25F14374FE1356D6D51C245"
"E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7ED"
"EE386BFB5A899FA5AE9F24117C4B1FE649286651ECE45B3D"
"C2007CB8A163BF0598DA48361C55D39A69163FA8FD24CF5F"
"83655D23DCA3AD961C62F356208552BB9ED529077096966D"
"670C354E4ABC9804F1746C08CA18217C32905E462E36CE3B"
"E39E772C180E86039B2783A2EC07A28FB5C55DF06F4C52C9"
"DE2BCBF6955817183995497CEA956AE515D2261898FA0510"
"15728E5A8AAAC42DAD33170D04507A33A85521ABDF1CBA64"
"ECFB850458DBEF0A8AEA71575D060C7DB3970F85A6E1E4C7"
"ABF5AE8CDB0933D71E8C94E04A25619DCEE3D2261AD2EE6B"
"F12FFA06D98A0864D87602733EC86A64521F2B18177B200C"
"BBE117577A615D6C770988C0BAD946E208E24FA074E5AB31"
"43DB5BFCE0FD108E4B82D120A92108011A723C12A787E6D7"
"88719A10BDBA5B2699C327186AF4E23C1A946834B6150BDA"
"2583E9CA2AD44CE8DBBBC2DB04DE8EF92E8EFC141FBECAA6"
"287C59474E6BC05D99B2964FA090C3A2233BA186515BE7ED"
"1F612970CEE2D7AFB81BDD762170481CD0069127D5B05AA9"
"93B4EA988D8FDDC186FFB7DC90A6C08F4DF435C934063199"
"FFFFFFFFFFFFFFFF";
const char * const mbedtls_dhm_rfc3526_modp_4096_g = "02";
/*
* Diffie-Hellman groups from RFC 7919
*/
const char * const mbedtls_dhm_rfc7919_ffdhe2048_p =
"FFFFFFFFFFFFFFFFADF85458A2BB4A9AAFDC5620273D3CF1"
"D8B9C583CE2D3695A9E13641146433FBCC939DCE249B3EF9"
"7D2FE363630C75D8F681B202AEC4617AD3DF1ED5D5FD6561"
"2433F51F5F066ED0856365553DED1AF3B557135E7F57C935"
"984F0C70E0E68B77E2A689DAF3EFE8721DF158A136ADE735"
"30ACCA4F483A797ABC0AB182B324FB61D108A94BB2C8E3FB"
"B96ADAB760D7F4681D4F42A3DE394DF4AE56EDE76372BB19"
"0B07A7C8EE0A6D709E02FCE1CDF7E2ECC03404CD28342F61"
"9172FE9CE98583FF8E4F1232EEF28183C3FE3B1B4C6FAD73"
"3BB5FCBC2EC22005C58EF1837D1683B2C6F34A26C1B2EFFA"
"886B423861285C97FFFFFFFFFFFFFFFF";
const char * const mbedtls_dhm_rfc7919_ffdhe2048_g = "02";
const char * const mbedtls_dhm_rfc7919_ffdhe3072_p =
"FFFFFFFFFFFFFFFFADF85458A2BB4A9AAFDC5620273D3CF1"
"D8B9C583CE2D3695A9E13641146433FBCC939DCE249B3EF9"
"7D2FE363630C75D8F681B202AEC4617AD3DF1ED5D5FD6561"
"2433F51F5F066ED0856365553DED1AF3B557135E7F57C935"
"984F0C70E0E68B77E2A689DAF3EFE8721DF158A136ADE735"
"30ACCA4F483A797ABC0AB182B324FB61D108A94BB2C8E3FB"
"B96ADAB760D7F4681D4F42A3DE394DF4AE56EDE76372BB19"
"0B07A7C8EE0A6D709E02FCE1CDF7E2ECC03404CD28342F61"
"9172FE9CE98583FF8E4F1232EEF28183C3FE3B1B4C6FAD73"
"3BB5FCBC2EC22005C58EF1837D1683B2C6F34A26C1B2EFFA"
"886B4238611FCFDCDE355B3B6519035BBC34F4DEF99C0238"
"61B46FC9D6E6C9077AD91D2691F7F7EE598CB0FAC186D91C"
"AEFE130985139270B4130C93BC437944F4FD4452E2D74DD3"
"64F2E21E71F54BFF5CAE82AB9C9DF69EE86D2BC522363A0D"
"ABC521979B0DEADA1DBF9A42D5C4484E0ABCD06BFA53DDEF"
"3C1B20EE3FD59D7C25E41D2B66C62E37FFFFFFFFFFFFFFFF";
const char * const mbedtls_dhm_rfc7919_ffdhe3072_g = "02";
const char * const mbedtls_dhm_rfc7919_ffdhe4096_p =
"FFFFFFFFFFFFFFFFADF85458A2BB4A9AAFDC5620273D3CF1"
"D8B9C583CE2D3695A9E13641146433FBCC939DCE249B3EF9"
"7D2FE363630C75D8F681B202AEC4617AD3DF1ED5D5FD6561"
"2433F51F5F066ED0856365553DED1AF3B557135E7F57C935"
"984F0C70E0E68B77E2A689DAF3EFE8721DF158A136ADE735"
"30ACCA4F483A797ABC0AB182B324FB61D108A94BB2C8E3FB"
"B96ADAB760D7F4681D4F42A3DE394DF4AE56EDE76372BB19"
"0B07A7C8EE0A6D709E02FCE1CDF7E2ECC03404CD28342F61"
"9172FE9CE98583FF8E4F1232EEF28183C3FE3B1B4C6FAD73"
"3BB5FCBC2EC22005C58EF1837D1683B2C6F34A26C1B2EFFA"
"886B4238611FCFDCDE355B3B6519035BBC34F4DEF99C0238"
"61B46FC9D6E6C9077AD91D2691F7F7EE598CB0FAC186D91C"
"AEFE130985139270B4130C93BC437944F4FD4452E2D74DD3"
"64F2E21E71F54BFF5CAE82AB9C9DF69EE86D2BC522363A0D"
"ABC521979B0DEADA1DBF9A42D5C4484E0ABCD06BFA53DDEF"
"3C1B20EE3FD59D7C25E41D2B669E1EF16E6F52C3164DF4FB"
"7930E9E4E58857B6AC7D5F42D69F6D187763CF1D55034004"
"87F55BA57E31CC7A7135C886EFB4318AED6A1E012D9E6832"
"A907600A918130C46DC778F971AD0038092999A333CB8B7A"
"1A1DB93D7140003C2A4ECEA9F98D0ACC0A8291CDCEC97DCF"
"8EC9B55A7F88A46B4DB5A851F44182E1C68A007E5E655F6A"
"FFFFFFFFFFFFFFFF";
const char * const mbedtls_dhm_rfc7919_ffdhe4096_g = "02";
const char * const mbedtls_dhm_rfc7919_ffdhe6144_p =
"FFFFFFFFFFFFFFFFADF85458A2BB4A9AAFDC5620273D3CF1"
"D8B9C583CE2D3695A9E13641146433FBCC939DCE249B3EF9"
"7D2FE363630C75D8F681B202AEC4617AD3DF1ED5D5FD6561"
"2433F51F5F066ED0856365553DED1AF3B557135E7F57C935"
"984F0C70E0E68B77E2A689DAF3EFE8721DF158A136ADE735"
"30ACCA4F483A797ABC0AB182B324FB61D108A94BB2C8E3FB"
"B96ADAB760D7F4681D4F42A3DE394DF4AE56EDE76372BB19"
"0B07A7C8EE0A6D709E02FCE1CDF7E2ECC03404CD28342F61"
"9172FE9CE98583FF8E4F1232EEF28183C3FE3B1B4C6FAD73"
"3BB5FCBC2EC22005C58EF1837D1683B2C6F34A26C1B2EFFA"
"886B4238611FCFDCDE355B3B6519035BBC34F4DEF99C0238"
"61B46FC9D6E6C9077AD91D2691F7F7EE598CB0FAC186D91C"
"AEFE130985139270B4130C93BC437944F4FD4452E2D74DD3"
"64F2E21E71F54BFF5CAE82AB9C9DF69EE86D2BC522363A0D"
"ABC521979B0DEADA1DBF9A42D5C4484E0ABCD06BFA53DDEF"
"3C1B20EE3FD59D7C25E41D2B669E1EF16E6F52C3164DF4FB"
"7930E9E4E58857B6AC7D5F42D69F6D187763CF1D55034004"
"87F55BA57E31CC7A7135C886EFB4318AED6A1E012D9E6832"
"A907600A918130C46DC778F971AD0038092999A333CB8B7A"
"1A1DB93D7140003C2A4ECEA9F98D0ACC0A8291CDCEC97DCF"
"8EC9B55A7F88A46B4DB5A851F44182E1C68A007E5E0DD902"
"0BFD64B645036C7A4E677D2C38532A3A23BA4442CAF53EA6"
"3BB454329B7624C8917BDD64B1C0FD4CB38E8C334C701C3A"
"CDAD0657FCCFEC719B1F5C3E4E46041F388147FB4CFDB477"
"A52471F7A9A96910B855322EDB6340D8A00EF092350511E3"
"0ABEC1FFF9E3A26E7FB29F8C183023C3587E38DA0077D9B4"
"763E4E4B94B2BBC194C6651E77CAF992EEAAC0232A281BF6"
"B3A739C1226116820AE8DB5847A67CBEF9C9091B462D538C"
"D72B03746AE77F5E62292C311562A846505DC82DB854338A"
"E49F5235C95B91178CCF2DD5CACEF403EC9D1810C6272B04"
"5B3B71F9DC6B80D63FDD4A8E9ADB1E6962A69526D43161C1"
"A41D570D7938DAD4A40E329CD0E40E65FFFFFFFFFFFFFFFF";
const char * const mbedtls_dhm_rfc7919_ffdhe6144_g = "02";
const char * const mbedtls_dhm_rfc7919_ffdhe8192_p =
"FFFFFFFFFFFFFFFFADF85458A2BB4A9AAFDC5620273D3CF1"
"D8B9C583CE2D3695A9E13641146433FBCC939DCE249B3EF9"
"7D2FE363630C75D8F681B202AEC4617AD3DF1ED5D5FD6561"
"2433F51F5F066ED0856365553DED1AF3B557135E7F57C935"
"984F0C70E0E68B77E2A689DAF3EFE8721DF158A136ADE735"
"30ACCA4F483A797ABC0AB182B324FB61D108A94BB2C8E3FB"
"B96ADAB760D7F4681D4F42A3DE394DF4AE56EDE76372BB19"
"0B07A7C8EE0A6D709E02FCE1CDF7E2ECC03404CD28342F61"
"9172FE9CE98583FF8E4F1232EEF28183C3FE3B1B4C6FAD73"
"3BB5FCBC2EC22005C58EF1837D1683B2C6F34A26C1B2EFFA"
"886B4238611FCFDCDE355B3B6519035BBC34F4DEF99C0238"
"61B46FC9D6E6C9077AD91D2691F7F7EE598CB0FAC186D91C"
"AEFE130985139270B4130C93BC437944F4FD4452E2D74DD3"
"64F2E21E71F54BFF5CAE82AB9C9DF69EE86D2BC522363A0D"
"ABC521979B0DEADA1DBF9A42D5C4484E0ABCD06BFA53DDEF"
"3C1B20EE3FD59D7C25E41D2B669E1EF16E6F52C3164DF4FB"
"7930E9E4E58857B6AC7D5F42D69F6D187763CF1D55034004"
"87F55BA57E31CC7A7135C886EFB4318AED6A1E012D9E6832"
"A907600A918130C46DC778F971AD0038092999A333CB8B7A"
"1A1DB93D7140003C2A4ECEA9F98D0ACC0A8291CDCEC97DCF"
"8EC9B55A7F88A46B4DB5A851F44182E1C68A007E5E0DD902"
"0BFD64B645036C7A4E677D2C38532A3A23BA4442CAF53EA6"
"3BB454329B7624C8917BDD64B1C0FD4CB38E8C334C701C3A"
"CDAD0657FCCFEC719B1F5C3E4E46041F388147FB4CFDB477"
"A52471F7A9A96910B855322EDB6340D8A00EF092350511E3"
"0ABEC1FFF9E3A26E7FB29F8C183023C3587E38DA0077D9B4"
"763E4E4B94B2BBC194C6651E77CAF992EEAAC0232A281BF6"
"B3A739C1226116820AE8DB5847A67CBEF9C9091B462D538C"
"D72B03746AE77F5E62292C311562A846505DC82DB854338A"
"E49F5235C95B91178CCF2DD5CACEF403EC9D1810C6272B04"
"5B3B71F9DC6B80D63FDD4A8E9ADB1E6962A69526D43161C1"
"A41D570D7938DAD4A40E329CCFF46AAA36AD004CF600C838"
"1E425A31D951AE64FDB23FCEC9509D43687FEB69EDD1CC5E"
"0B8CC3BDF64B10EF86B63142A3AB8829555B2F747C932665"
"CB2C0F1CC01BD70229388839D2AF05E454504AC78B758282"
"2846C0BA35C35F5C59160CC046FD8251541FC68C9C86B022"
"BB7099876A460E7451A8A93109703FEE1C217E6C3826E52C"
"51AA691E0E423CFC99E9E31650C1217B624816CDAD9A95F9"
"D5B8019488D9C0A0A1FE3075A577E23183F81D4A3F2FA457"
"1EFC8CE0BA8A4FE8B6855DFE72B0A66EDED2FBABFBE58A30"
"FAFABE1C5D71A87E2F741EF8C1FE86FEA6BBFDE530677F0D"
"97D11D49F7A8443D0822E506A9F4614E011E2A94838FF88C"
"D68C8BB7C5C6424CFFFFFFFF"
"FFFFFFFF";
const char * const mbedtls_dhm_rfc7919_ffdhe8192_g = "02";
/* Implementation that should never be optimized out by the compiler */
static void mbedtls_zeroize( void *v, size_t n ) {
volatile unsigned char *p = v; while( n-- ) *p++ = 0;
}
/*
* helper to validate the mbedtls_mpi size and import it
*/
static int dhm_read_bignum( mbedtls_mpi *X,
unsigned char **p,
const unsigned char *end )
{
int ret, n;
if( end - *p < 2 )
return( MBEDTLS_ERR_DHM_BAD_INPUT_DATA );
n = ( (*p)[0] << 8 ) | (*p)[1];
(*p) += 2;
if( (int)( end - *p ) < n )
return( MBEDTLS_ERR_DHM_BAD_INPUT_DATA );
if( ( ret = mbedtls_mpi_read_binary( X, *p, n ) ) != 0 )
return( MBEDTLS_ERR_DHM_READ_PARAMS_FAILED + ret );
(*p) += n;
return( 0 );
}
/*
* Verify sanity of parameter with regards to P
*
* Parameter should be: 2 <= public_param <= P - 2
*
* For more information on the attack, see:
* http://www.cl.cam.ac.uk/~rja14/Papers/psandqs.pdf
* http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2005-2643
*/
static int dhm_check_range( const mbedtls_mpi *param, const mbedtls_mpi *P )
{
mbedtls_mpi L, U;
int ret = MBEDTLS_ERR_DHM_BAD_INPUT_DATA;
mbedtls_mpi_init( &L ); mbedtls_mpi_init( &U );
MBEDTLS_MPI_CHK( mbedtls_mpi_lset( &L, 2 ) );
MBEDTLS_MPI_CHK( mbedtls_mpi_sub_int( &U, P, 2 ) );
if( mbedtls_mpi_cmp_mpi( param, &L ) >= 0 &&
mbedtls_mpi_cmp_mpi( param, &U ) <= 0 )
{
ret = 0;
}
cleanup:
mbedtls_mpi_free( &L ); mbedtls_mpi_free( &U );
return( ret );
}
void mbedtls_dhm_init( mbedtls_dhm_context *ctx )
{
memset( ctx, 0, sizeof( mbedtls_dhm_context ) );
}
/*
* Parse the ServerKeyExchange parameters
*/
int mbedtls_dhm_read_params( mbedtls_dhm_context *ctx,
unsigned char **p,
const unsigned char *end )
{
int ret;
if( ( ret = dhm_read_bignum( &ctx->P, p, end ) ) != 0 ||
( ret = dhm_read_bignum( &ctx->G, p, end ) ) != 0 ||
( ret = dhm_read_bignum( &ctx->GY, p, end ) ) != 0 )
return( ret );
if( ( ret = dhm_check_range( &ctx->GY, &ctx->P ) ) != 0 )
return( ret );
ctx->len = mbedtls_mpi_size( &ctx->P );
return( 0 );
}
/*
* Setup and write the ServerKeyExchange parameters
*/
int mbedtls_dhm_make_params( mbedtls_dhm_context *ctx, int x_size,
unsigned char *output, size_t *olen,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng )
{
int ret, count = 0;
size_t n1, n2, n3;
unsigned char *p;
if( mbedtls_mpi_cmp_int( &ctx->P, 0 ) == 0 )
return( MBEDTLS_ERR_DHM_BAD_INPUT_DATA );
/*
* Generate X as large as possible ( < P )
*/
do
{
MBEDTLS_MPI_CHK( mbedtls_mpi_fill_random( &ctx->X, x_size, f_rng, p_rng ) );
while( mbedtls_mpi_cmp_mpi( &ctx->X, &ctx->P ) >= 0 )
MBEDTLS_MPI_CHK( mbedtls_mpi_shift_r( &ctx->X, 1 ) );
if( count++ > 10 )
return( MBEDTLS_ERR_DHM_MAKE_PARAMS_FAILED );
}
while( dhm_check_range( &ctx->X, &ctx->P ) != 0 );
/*
* Calculate GX = G^X mod P
*/
MBEDTLS_MPI_CHK( mbedtls_mpi_exp_mod( &ctx->GX, &ctx->G, &ctx->X,
&ctx->P , &ctx->RP ) );
if( ( ret = dhm_check_range( &ctx->GX, &ctx->P ) ) != 0 )
return( ret );
/*
* export P, G, GX
*/
#define DHM_MPI_EXPORT(X,n) \
do { \
MBEDTLS_MPI_CHK( mbedtls_mpi_write_binary( X, p + 2, n ) ); \
*p++ = (unsigned char)( n >> 8 ); \
*p++ = (unsigned char)( n ); \
p += n; \
} while( 0 )
n1 = mbedtls_mpi_size( &ctx->P );
n2 = mbedtls_mpi_size( &ctx->G );
n3 = mbedtls_mpi_size( &ctx->GX );
p = output;
DHM_MPI_EXPORT( &ctx->P , n1 );
DHM_MPI_EXPORT( &ctx->G , n2 );
DHM_MPI_EXPORT( &ctx->GX, n3 );
*olen = p - output;
ctx->len = n1;
cleanup:
if( ret != 0 )
return( MBEDTLS_ERR_DHM_MAKE_PARAMS_FAILED + ret );
return( 0 );
}
/*
* Import the peer's public value G^Y
*/
int mbedtls_dhm_read_public( mbedtls_dhm_context *ctx,
const unsigned char *input, size_t ilen )
{
int ret;
if( ctx == NULL || ilen < 1 || ilen > ctx->len )
return( MBEDTLS_ERR_DHM_BAD_INPUT_DATA );
if( ( ret = mbedtls_mpi_read_binary( &ctx->GY, input, ilen ) ) != 0 )
return( MBEDTLS_ERR_DHM_READ_PUBLIC_FAILED + ret );
return( 0 );
}
/*
* Create own private value X and export G^X
*/
int mbedtls_dhm_make_public( mbedtls_dhm_context *ctx, int x_size,
unsigned char *output, size_t olen,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng )
{
int ret, count = 0;
if( ctx == NULL || olen < 1 || olen > ctx->len )
return( MBEDTLS_ERR_DHM_BAD_INPUT_DATA );
if( mbedtls_mpi_cmp_int( &ctx->P, 0 ) == 0 )
return( MBEDTLS_ERR_DHM_BAD_INPUT_DATA );
/*
* generate X and calculate GX = G^X mod P
*/
do
{
MBEDTLS_MPI_CHK( mbedtls_mpi_fill_random( &ctx->X, x_size, f_rng, p_rng ) );
while( mbedtls_mpi_cmp_mpi( &ctx->X, &ctx->P ) >= 0 )
MBEDTLS_MPI_CHK( mbedtls_mpi_shift_r( &ctx->X, 1 ) );
if( count++ > 10 )
return( MBEDTLS_ERR_DHM_MAKE_PUBLIC_FAILED );
}
while( dhm_check_range( &ctx->X, &ctx->P ) != 0 );
MBEDTLS_MPI_CHK( mbedtls_mpi_exp_mod( &ctx->GX, &ctx->G, &ctx->X,
&ctx->P , &ctx->RP ) );
if( ( ret = dhm_check_range( &ctx->GX, &ctx->P ) ) != 0 )
return( ret );
MBEDTLS_MPI_CHK( mbedtls_mpi_write_binary( &ctx->GX, output, olen ) );
cleanup:
if( ret != 0 )
return( MBEDTLS_ERR_DHM_MAKE_PUBLIC_FAILED + ret );
return( 0 );
}
/*
* Use the blinding method and optimisation suggested in section 10 of:
* KOCHER, Paul C. Timing attacks on implementations of Diffie-Hellman, RSA,
* DSS, and other systems. In : Advances in Cryptology-CRYPTO'96. Springer
* Berlin Heidelberg, 1996. p. 104-113.
*/
static int dhm_update_blinding( mbedtls_dhm_context *ctx,
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng )
{
int ret, count;
/*
* Don't use any blinding the first time a particular X is used,
* but remember it to use blinding next time.
*/
if( mbedtls_mpi_cmp_mpi( &ctx->X, &ctx->pX ) != 0 )
{
MBEDTLS_MPI_CHK( mbedtls_mpi_copy( &ctx->pX, &ctx->X ) );
MBEDTLS_MPI_CHK( mbedtls_mpi_lset( &ctx->Vi, 1 ) );
MBEDTLS_MPI_CHK( mbedtls_mpi_lset( &ctx->Vf, 1 ) );
return( 0 );
}
/*
* Ok, we need blinding. Can we re-use existing values?
* If yes, just update them by squaring them.
*/
if( mbedtls_mpi_cmp_int( &ctx->Vi, 1 ) != 0 )
{
MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( &ctx->Vi, &ctx->Vi, &ctx->Vi ) );
MBEDTLS_MPI_CHK( mbedtls_mpi_mod_mpi( &ctx->Vi, &ctx->Vi, &ctx->P ) );
MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( &ctx->Vf, &ctx->Vf, &ctx->Vf ) );
MBEDTLS_MPI_CHK( mbedtls_mpi_mod_mpi( &ctx->Vf, &ctx->Vf, &ctx->P ) );
return( 0 );
}
/*
* We need to generate blinding values from scratch
*/
/* Vi = random( 2, P-1 ) */
count = 0;
do
{
MBEDTLS_MPI_CHK( mbedtls_mpi_fill_random( &ctx->Vi, mbedtls_mpi_size( &ctx->P ), f_rng, p_rng ) );
while( mbedtls_mpi_cmp_mpi( &ctx->Vi, &ctx->P ) >= 0 )
MBEDTLS_MPI_CHK( mbedtls_mpi_shift_r( &ctx->Vi, 1 ) );
if( count++ > 10 )
return( MBEDTLS_ERR_MPI_NOT_ACCEPTABLE );
}
while( mbedtls_mpi_cmp_int( &ctx->Vi, 1 ) <= 0 );
/* Vf = Vi^-X mod P */
MBEDTLS_MPI_CHK( mbedtls_mpi_inv_mod( &ctx->Vf, &ctx->Vi, &ctx->P ) );
MBEDTLS_MPI_CHK( mbedtls_mpi_exp_mod( &ctx->Vf, &ctx->Vf, &ctx->X, &ctx->P, &ctx->RP ) );
cleanup:
return( ret );
}
/*
* Derive and export the shared secret (G^Y)^X mod P
*/
int mbedtls_dhm_calc_secret( mbedtls_dhm_context *ctx,
unsigned char *output, size_t output_size, size_t *olen,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng )
{
int ret;
mbedtls_mpi GYb;
if( ctx == NULL || output_size < ctx->len )
return( MBEDTLS_ERR_DHM_BAD_INPUT_DATA );
if( ( ret = dhm_check_range( &ctx->GY, &ctx->P ) ) != 0 )
return( ret );
mbedtls_mpi_init( &GYb );
/* Blind peer's value */
if( f_rng != NULL )
{
MBEDTLS_MPI_CHK( dhm_update_blinding( ctx, f_rng, p_rng ) );
MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( &GYb, &ctx->GY, &ctx->Vi ) );
MBEDTLS_MPI_CHK( mbedtls_mpi_mod_mpi( &GYb, &GYb, &ctx->P ) );
}
else
MBEDTLS_MPI_CHK( mbedtls_mpi_copy( &GYb, &ctx->GY ) );
/* Do modular exponentiation */
MBEDTLS_MPI_CHK( mbedtls_mpi_exp_mod( &ctx->K, &GYb, &ctx->X,
&ctx->P, &ctx->RP ) );
/* Unblind secret value */
if( f_rng != NULL )
{
MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( &ctx->K, &ctx->K, &ctx->Vf ) );
MBEDTLS_MPI_CHK( mbedtls_mpi_mod_mpi( &ctx->K, &ctx->K, &ctx->P ) );
}
*olen = mbedtls_mpi_size( &ctx->K );
MBEDTLS_MPI_CHK( mbedtls_mpi_write_binary( &ctx->K, output, *olen ) );
cleanup:
mbedtls_mpi_free( &GYb );
if( ret != 0 )
return( MBEDTLS_ERR_DHM_CALC_SECRET_FAILED + ret );
return( 0 );
}
/*
* Free the components of a DHM key
*/
void mbedtls_dhm_free( mbedtls_dhm_context *ctx )
{
mbedtls_mpi_free( &ctx->pX ); mbedtls_mpi_free( &ctx->Vf );
mbedtls_mpi_free( &ctx->Vi ); mbedtls_mpi_free( &ctx->RP );
mbedtls_mpi_free( &ctx->K ); mbedtls_mpi_free( &ctx->GY );
mbedtls_mpi_free( &ctx->GX ); mbedtls_mpi_free( &ctx->X );
mbedtls_mpi_free( &ctx->G ); mbedtls_mpi_free( &ctx->P );
mbedtls_zeroize( ctx, sizeof( mbedtls_dhm_context ) );
}
#if defined(MBEDTLS_ASN1_PARSE_C)
/*
* Parse DHM parameters
*/
int mbedtls_dhm_parse_dhm( mbedtls_dhm_context *dhm, const unsigned char *dhmin,
size_t dhminlen )
{
int ret;
size_t len;
unsigned char *p, *end;
#if defined(MBEDTLS_PEM_PARSE_C)
mbedtls_pem_context pem;
mbedtls_pem_init( &pem );
/* Avoid calling mbedtls_pem_read_buffer() on non-null-terminated string */
if( dhminlen == 0 || dhmin[dhminlen - 1] != '\0' )
ret = MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT;
else
ret = mbedtls_pem_read_buffer( &pem,
"-----BEGIN DH PARAMETERS-----",
"-----END DH PARAMETERS-----",
dhmin, NULL, 0, &dhminlen );
if( ret == 0 )
{
/*
* Was PEM encoded
*/
dhminlen = pem.buflen;
}
else if( ret != MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT )
goto exit;
p = ( ret == 0 ) ? pem.buf : (unsigned char *) dhmin;
#else
p = (unsigned char *) dhmin;
#endif /* MBEDTLS_PEM_PARSE_C */
end = p + dhminlen;
/*
* DHParams ::= SEQUENCE {
* prime INTEGER, -- P
* generator INTEGER, -- g
* privateValueLength INTEGER OPTIONAL
* }
*/
if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
{
ret = MBEDTLS_ERR_DHM_INVALID_FORMAT + ret;
goto exit;
}
end = p + len;
if( ( ret = mbedtls_asn1_get_mpi( &p, end, &dhm->P ) ) != 0 ||
( ret = mbedtls_asn1_get_mpi( &p, end, &dhm->G ) ) != 0 )
{
ret = MBEDTLS_ERR_DHM_INVALID_FORMAT + ret;
goto exit;
}
if( p != end )
{
/* This might be the optional privateValueLength.
* If so, we can cleanly discard it */
mbedtls_mpi rec;
mbedtls_mpi_init( &rec );
ret = mbedtls_asn1_get_mpi( &p, end, &rec );
mbedtls_mpi_free( &rec );
if ( ret != 0 )
{
ret = MBEDTLS_ERR_DHM_INVALID_FORMAT + ret;
goto exit;
}
if ( p != end )
{
ret = MBEDTLS_ERR_DHM_INVALID_FORMAT +
MBEDTLS_ERR_ASN1_LENGTH_MISMATCH;
goto exit;
}
}
ret = 0;
dhm->len = mbedtls_mpi_size( &dhm->P );
exit:
#if defined(MBEDTLS_PEM_PARSE_C)
mbedtls_pem_free( &pem );
#endif
if( ret != 0 )
mbedtls_dhm_free( dhm );
return( ret );
}
#if defined(MBEDTLS_FS_IO)
/*
* Load all data from a file into a given buffer.
*
* The file is expected to contain either PEM or DER encoded data.
* A terminating null byte is always appended. It is included in the announced
* length only if the data looks like it is PEM encoded.
*/
static int load_file( const char *path, unsigned char **buf, size_t *n )
{
FILE *f;
long size;
if( ( f = fopen( path, "rb" ) ) == NULL )
return( MBEDTLS_ERR_DHM_FILE_IO_ERROR );
fseek( f, 0, SEEK_END );
if( ( size = ftell( f ) ) == -1 )
{
fclose( f );
return( MBEDTLS_ERR_DHM_FILE_IO_ERROR );
}
fseek( f, 0, SEEK_SET );
*n = (size_t) size;
if( *n + 1 == 0 ||
( *buf = mbedtls_calloc( 1, *n + 1 ) ) == NULL )
{
fclose( f );
return( MBEDTLS_ERR_DHM_ALLOC_FAILED );
}
if( fread( *buf, 1, *n, f ) != *n )
{
fclose( f );
mbedtls_free( *buf );
return( MBEDTLS_ERR_DHM_FILE_IO_ERROR );
}
fclose( f );
(*buf)[*n] = '\0';
if( strstr( (const char *) *buf, "-----BEGIN " ) != NULL )
++*n;
return( 0 );
}
/*
* Load and parse DHM parameters
*/
int mbedtls_dhm_parse_dhmfile( mbedtls_dhm_context *dhm, const char *path )
{
int ret;
size_t n;
unsigned char *buf;
if( ( ret = load_file( path, &buf, &n ) ) != 0 )
return( ret );
ret = mbedtls_dhm_parse_dhm( dhm, buf, n );
mbedtls_zeroize( buf, n );
mbedtls_free( buf );
return( ret );
}
#endif /* MBEDTLS_FS_IO */
#endif /* MBEDTLS_ASN1_PARSE_C */
#if defined(MBEDTLS_SELF_TEST)
static const char mbedtls_test_dhm_params[] =
"-----BEGIN DH PARAMETERS-----\r\n"
"MIGHAoGBAJ419DBEOgmQTzo5qXl5fQcN9TN455wkOL7052HzxxRVMyhYmwQcgJvh\r\n"
"1sa18fyfR9OiVEMYglOpkqVoGLN7qd5aQNNi5W7/C+VBdHTBJcGZJyyP5B3qcz32\r\n"
"9mLJKudlVudV0Qxk5qUJaPZ/xupz0NyoVpviuiBOI1gNi8ovSXWzAgEC\r\n"
"-----END DH PARAMETERS-----\r\n";
static const size_t mbedtls_test_dhm_params_len = sizeof( mbedtls_test_dhm_params );
/*
* Checkup routine
*/
int mbedtls_dhm_self_test( int verbose )
{
int ret;
mbedtls_dhm_context dhm;
mbedtls_dhm_init( &dhm );
if( verbose != 0 )
mbedtls_printf( " DHM parameter load: " );
if( ( ret = mbedtls_dhm_parse_dhm( &dhm,
(const unsigned char *) mbedtls_test_dhm_params,
mbedtls_test_dhm_params_len ) ) != 0 )
{
if( verbose != 0 )
mbedtls_printf( "failed\n" );
ret = 1;
goto exit;
}
if( verbose != 0 )
mbedtls_printf( "passed\n\n" );
exit:
mbedtls_dhm_free( &dhm );
return( ret );
}
#endif /* MBEDTLS_SELF_TEST */
#endif /* MBEDTLS_DHM_C */
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