/* | |
* Elliptic curve J-PAKE | |
* | |
* 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) | |
*/ | |
/* | |
* References in the code are to the Thread v1.0 Specification, | |
* available to members of the Thread Group http://threadgroup.org/ | |
*/ | |
#if !defined(MBEDTLS_CONFIG_FILE) | |
#include "mbedtls/config.h" | |
#else | |
#include MBEDTLS_CONFIG_FILE | |
#endif | |
#if defined(MBEDTLS_ECJPAKE_C) | |
#include "mbedtls/ecjpake.h" | |
#include "mbedtls/platform_util.h" | |
#include <string.h> | |
#if !defined(MBEDTLS_ECJPAKE_ALT) | |
/* Parameter validation macros based on platform_util.h */ | |
#define ECJPAKE_VALIDATE_RET( cond ) \ | |
MBEDTLS_INTERNAL_VALIDATE_RET( cond, MBEDTLS_ERR_ECP_BAD_INPUT_DATA ) | |
#define ECJPAKE_VALIDATE( cond ) \ | |
MBEDTLS_INTERNAL_VALIDATE( cond ) | |
/* | |
* Convert a mbedtls_ecjpake_role to identifier string | |
*/ | |
static const char * const ecjpake_id[] = { | |
"client", | |
"server" | |
}; | |
#define ID_MINE ( ecjpake_id[ ctx->role ] ) | |
#define ID_PEER ( ecjpake_id[ 1 - ctx->role ] ) | |
/* | |
* Initialize context | |
*/ | |
void mbedtls_ecjpake_init( mbedtls_ecjpake_context *ctx ) | |
{ | |
ECJPAKE_VALIDATE( ctx != NULL ); | |
ctx->md_info = NULL; | |
mbedtls_ecp_group_init( &ctx->grp ); | |
ctx->point_format = MBEDTLS_ECP_PF_UNCOMPRESSED; | |
mbedtls_ecp_point_init( &ctx->Xm1 ); | |
mbedtls_ecp_point_init( &ctx->Xm2 ); | |
mbedtls_ecp_point_init( &ctx->Xp1 ); | |
mbedtls_ecp_point_init( &ctx->Xp2 ); | |
mbedtls_ecp_point_init( &ctx->Xp ); | |
mbedtls_mpi_init( &ctx->xm1 ); | |
mbedtls_mpi_init( &ctx->xm2 ); | |
mbedtls_mpi_init( &ctx->s ); | |
} | |
/* | |
* Free context | |
*/ | |
void mbedtls_ecjpake_free( mbedtls_ecjpake_context *ctx ) | |
{ | |
if( ctx == NULL ) | |
return; | |
ctx->md_info = NULL; | |
mbedtls_ecp_group_free( &ctx->grp ); | |
mbedtls_ecp_point_free( &ctx->Xm1 ); | |
mbedtls_ecp_point_free( &ctx->Xm2 ); | |
mbedtls_ecp_point_free( &ctx->Xp1 ); | |
mbedtls_ecp_point_free( &ctx->Xp2 ); | |
mbedtls_ecp_point_free( &ctx->Xp ); | |
mbedtls_mpi_free( &ctx->xm1 ); | |
mbedtls_mpi_free( &ctx->xm2 ); | |
mbedtls_mpi_free( &ctx->s ); | |
} | |
/* | |
* Setup context | |
*/ | |
int mbedtls_ecjpake_setup( mbedtls_ecjpake_context *ctx, | |
mbedtls_ecjpake_role role, | |
mbedtls_md_type_t hash, | |
mbedtls_ecp_group_id curve, | |
const unsigned char *secret, | |
size_t len ) | |
{ | |
int ret; | |
ECJPAKE_VALIDATE_RET( ctx != NULL ); | |
ECJPAKE_VALIDATE_RET( role == MBEDTLS_ECJPAKE_CLIENT || | |
role == MBEDTLS_ECJPAKE_SERVER ); | |
ECJPAKE_VALIDATE_RET( secret != NULL || len == 0 ); | |
ctx->role = role; | |
if( ( ctx->md_info = mbedtls_md_info_from_type( hash ) ) == NULL ) | |
return( MBEDTLS_ERR_MD_FEATURE_UNAVAILABLE ); | |
MBEDTLS_MPI_CHK( mbedtls_ecp_group_load( &ctx->grp, curve ) ); | |
MBEDTLS_MPI_CHK( mbedtls_mpi_read_binary( &ctx->s, secret, len ) ); | |
cleanup: | |
if( ret != 0 ) | |
mbedtls_ecjpake_free( ctx ); | |
return( ret ); | |
} | |
/* | |
* Check if context is ready for use | |
*/ | |
int mbedtls_ecjpake_check( const mbedtls_ecjpake_context *ctx ) | |
{ | |
ECJPAKE_VALIDATE_RET( ctx != NULL ); | |
if( ctx->md_info == NULL || | |
ctx->grp.id == MBEDTLS_ECP_DP_NONE || | |
ctx->s.p == NULL ) | |
{ | |
return( MBEDTLS_ERR_ECP_BAD_INPUT_DATA ); | |
} | |
return( 0 ); | |
} | |
/* | |
* Write a point plus its length to a buffer | |
*/ | |
static int ecjpake_write_len_point( unsigned char **p, | |
const unsigned char *end, | |
const mbedtls_ecp_group *grp, | |
const int pf, | |
const mbedtls_ecp_point *P ) | |
{ | |
int ret; | |
size_t len; | |
/* Need at least 4 for length plus 1 for point */ | |
if( end < *p || end - *p < 5 ) | |
return( MBEDTLS_ERR_ECP_BUFFER_TOO_SMALL ); | |
ret = mbedtls_ecp_point_write_binary( grp, P, pf, | |
&len, *p + 4, end - ( *p + 4 ) ); | |
if( ret != 0 ) | |
return( ret ); | |
(*p)[0] = (unsigned char)( ( len >> 24 ) & 0xFF ); | |
(*p)[1] = (unsigned char)( ( len >> 16 ) & 0xFF ); | |
(*p)[2] = (unsigned char)( ( len >> 8 ) & 0xFF ); | |
(*p)[3] = (unsigned char)( ( len ) & 0xFF ); | |
*p += 4 + len; | |
return( 0 ); | |
} | |
/* | |
* Size of the temporary buffer for ecjpake_hash: | |
* 3 EC points plus their length, plus ID and its length (4 + 6 bytes) | |
*/ | |
#define ECJPAKE_HASH_BUF_LEN ( 3 * ( 4 + MBEDTLS_ECP_MAX_PT_LEN ) + 4 + 6 ) | |
/* | |
* Compute hash for ZKP (7.4.2.2.2.1) | |
*/ | |
static int ecjpake_hash( const mbedtls_md_info_t *md_info, | |
const mbedtls_ecp_group *grp, | |
const int pf, | |
const mbedtls_ecp_point *G, | |
const mbedtls_ecp_point *V, | |
const mbedtls_ecp_point *X, | |
const char *id, | |
mbedtls_mpi *h ) | |
{ | |
int ret; | |
unsigned char buf[ECJPAKE_HASH_BUF_LEN]; | |
unsigned char *p = buf; | |
const unsigned char *end = buf + sizeof( buf ); | |
const size_t id_len = strlen( id ); | |
unsigned char hash[MBEDTLS_MD_MAX_SIZE]; | |
/* Write things to temporary buffer */ | |
MBEDTLS_MPI_CHK( ecjpake_write_len_point( &p, end, grp, pf, G ) ); | |
MBEDTLS_MPI_CHK( ecjpake_write_len_point( &p, end, grp, pf, V ) ); | |
MBEDTLS_MPI_CHK( ecjpake_write_len_point( &p, end, grp, pf, X ) ); | |
if( end - p < 4 ) | |
return( MBEDTLS_ERR_ECP_BUFFER_TOO_SMALL ); | |
*p++ = (unsigned char)( ( id_len >> 24 ) & 0xFF ); | |
*p++ = (unsigned char)( ( id_len >> 16 ) & 0xFF ); | |
*p++ = (unsigned char)( ( id_len >> 8 ) & 0xFF ); | |
*p++ = (unsigned char)( ( id_len ) & 0xFF ); | |
if( end < p || (size_t)( end - p ) < id_len ) | |
return( MBEDTLS_ERR_ECP_BUFFER_TOO_SMALL ); | |
memcpy( p, id, id_len ); | |
p += id_len; | |
/* Compute hash */ | |
mbedtls_md( md_info, buf, p - buf, hash ); | |
/* Turn it into an integer mod n */ | |
MBEDTLS_MPI_CHK( mbedtls_mpi_read_binary( h, hash, | |
mbedtls_md_get_size( md_info ) ) ); | |
MBEDTLS_MPI_CHK( mbedtls_mpi_mod_mpi( h, h, &grp->N ) ); | |
cleanup: | |
return( ret ); | |
} | |
/* | |
* Parse a ECShnorrZKP (7.4.2.2.2) and verify it (7.4.2.3.3) | |
*/ | |
static int ecjpake_zkp_read( const mbedtls_md_info_t *md_info, | |
const mbedtls_ecp_group *grp, | |
const int pf, | |
const mbedtls_ecp_point *G, | |
const mbedtls_ecp_point *X, | |
const char *id, | |
const unsigned char **p, | |
const unsigned char *end ) | |
{ | |
int ret; | |
mbedtls_ecp_point V, VV; | |
mbedtls_mpi r, h; | |
size_t r_len; | |
mbedtls_ecp_point_init( &V ); | |
mbedtls_ecp_point_init( &VV ); | |
mbedtls_mpi_init( &r ); | |
mbedtls_mpi_init( &h ); | |
/* | |
* struct { | |
* ECPoint V; | |
* opaque r<1..2^8-1>; | |
* } ECSchnorrZKP; | |
*/ | |
if( end < *p ) | |
return( MBEDTLS_ERR_ECP_BAD_INPUT_DATA ); | |
MBEDTLS_MPI_CHK( mbedtls_ecp_tls_read_point( grp, &V, p, end - *p ) ); | |
if( end < *p || (size_t)( end - *p ) < 1 ) | |
{ | |
ret = MBEDTLS_ERR_ECP_BAD_INPUT_DATA; | |
goto cleanup; | |
} | |
r_len = *(*p)++; | |
if( end < *p || (size_t)( end - *p ) < r_len ) | |
{ | |
ret = MBEDTLS_ERR_ECP_BAD_INPUT_DATA; | |
goto cleanup; | |
} | |
MBEDTLS_MPI_CHK( mbedtls_mpi_read_binary( &r, *p, r_len ) ); | |
*p += r_len; | |
/* | |
* Verification | |
*/ | |
MBEDTLS_MPI_CHK( ecjpake_hash( md_info, grp, pf, G, &V, X, id, &h ) ); | |
MBEDTLS_MPI_CHK( mbedtls_ecp_muladd( (mbedtls_ecp_group *) grp, | |
&VV, &h, X, &r, G ) ); | |
if( mbedtls_ecp_point_cmp( &VV, &V ) != 0 ) | |
{ | |
ret = MBEDTLS_ERR_ECP_VERIFY_FAILED; | |
goto cleanup; | |
} | |
cleanup: | |
mbedtls_ecp_point_free( &V ); | |
mbedtls_ecp_point_free( &VV ); | |
mbedtls_mpi_free( &r ); | |
mbedtls_mpi_free( &h ); | |
return( ret ); | |
} | |
/* | |
* Generate ZKP (7.4.2.3.2) and write it as ECSchnorrZKP (7.4.2.2.2) | |
*/ | |
static int ecjpake_zkp_write( const mbedtls_md_info_t *md_info, | |
const mbedtls_ecp_group *grp, | |
const int pf, | |
const mbedtls_ecp_point *G, | |
const mbedtls_mpi *x, | |
const mbedtls_ecp_point *X, | |
const char *id, | |
unsigned char **p, | |
const unsigned char *end, | |
int (*f_rng)(void *, unsigned char *, size_t), | |
void *p_rng ) | |
{ | |
int ret; | |
mbedtls_ecp_point V; | |
mbedtls_mpi v; | |
mbedtls_mpi h; /* later recycled to hold r */ | |
size_t len; | |
if( end < *p ) | |
return( MBEDTLS_ERR_ECP_BUFFER_TOO_SMALL ); | |
mbedtls_ecp_point_init( &V ); | |
mbedtls_mpi_init( &v ); | |
mbedtls_mpi_init( &h ); | |
/* Compute signature */ | |
MBEDTLS_MPI_CHK( mbedtls_ecp_gen_keypair_base( (mbedtls_ecp_group *) grp, | |
G, &v, &V, f_rng, p_rng ) ); | |
MBEDTLS_MPI_CHK( ecjpake_hash( md_info, grp, pf, G, &V, X, id, &h ) ); | |
MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( &h, &h, x ) ); /* x*h */ | |
MBEDTLS_MPI_CHK( mbedtls_mpi_sub_mpi( &h, &v, &h ) ); /* v - x*h */ | |
MBEDTLS_MPI_CHK( mbedtls_mpi_mod_mpi( &h, &h, &grp->N ) ); /* r */ | |
/* Write it out */ | |
MBEDTLS_MPI_CHK( mbedtls_ecp_tls_write_point( grp, &V, | |
pf, &len, *p, end - *p ) ); | |
*p += len; | |
len = mbedtls_mpi_size( &h ); /* actually r */ | |
if( end < *p || (size_t)( end - *p ) < 1 + len || len > 255 ) | |
{ | |
ret = MBEDTLS_ERR_ECP_BUFFER_TOO_SMALL; | |
goto cleanup; | |
} | |
*(*p)++ = (unsigned char)( len & 0xFF ); | |
MBEDTLS_MPI_CHK( mbedtls_mpi_write_binary( &h, *p, len ) ); /* r */ | |
*p += len; | |
cleanup: | |
mbedtls_ecp_point_free( &V ); | |
mbedtls_mpi_free( &v ); | |
mbedtls_mpi_free( &h ); | |
return( ret ); | |
} | |
/* | |
* Parse a ECJPAKEKeyKP (7.4.2.2.1) and check proof | |
* Output: verified public key X | |
*/ | |
static int ecjpake_kkp_read( const mbedtls_md_info_t *md_info, | |
const mbedtls_ecp_group *grp, | |
const int pf, | |
const mbedtls_ecp_point *G, | |
mbedtls_ecp_point *X, | |
const char *id, | |
const unsigned char **p, | |
const unsigned char *end ) | |
{ | |
int ret; | |
if( end < *p ) | |
return( MBEDTLS_ERR_ECP_BAD_INPUT_DATA ); | |
/* | |
* struct { | |
* ECPoint X; | |
* ECSchnorrZKP zkp; | |
* } ECJPAKEKeyKP; | |
*/ | |
MBEDTLS_MPI_CHK( mbedtls_ecp_tls_read_point( grp, X, p, end - *p ) ); | |
if( mbedtls_ecp_is_zero( X ) ) | |
{ | |
ret = MBEDTLS_ERR_ECP_INVALID_KEY; | |
goto cleanup; | |
} | |
MBEDTLS_MPI_CHK( ecjpake_zkp_read( md_info, grp, pf, G, X, id, p, end ) ); | |
cleanup: | |
return( ret ); | |
} | |
/* | |
* Generate an ECJPAKEKeyKP | |
* Output: the serialized structure, plus private/public key pair | |
*/ | |
static int ecjpake_kkp_write( const mbedtls_md_info_t *md_info, | |
const mbedtls_ecp_group *grp, | |
const int pf, | |
const mbedtls_ecp_point *G, | |
mbedtls_mpi *x, | |
mbedtls_ecp_point *X, | |
const char *id, | |
unsigned char **p, | |
const unsigned char *end, | |
int (*f_rng)(void *, unsigned char *, size_t), | |
void *p_rng ) | |
{ | |
int ret; | |
size_t len; | |
if( end < *p ) | |
return( MBEDTLS_ERR_ECP_BUFFER_TOO_SMALL ); | |
/* Generate key (7.4.2.3.1) and write it out */ | |
MBEDTLS_MPI_CHK( mbedtls_ecp_gen_keypair_base( (mbedtls_ecp_group *) grp, G, x, X, | |
f_rng, p_rng ) ); | |
MBEDTLS_MPI_CHK( mbedtls_ecp_tls_write_point( grp, X, | |
pf, &len, *p, end - *p ) ); | |
*p += len; | |
/* Generate and write proof */ | |
MBEDTLS_MPI_CHK( ecjpake_zkp_write( md_info, grp, pf, G, x, X, id, | |
p, end, f_rng, p_rng ) ); | |
cleanup: | |
return( ret ); | |
} | |
/* | |
* Read a ECJPAKEKeyKPPairList (7.4.2.3) and check proofs | |
* Ouputs: verified peer public keys Xa, Xb | |
*/ | |
static int ecjpake_kkpp_read( const mbedtls_md_info_t *md_info, | |
const mbedtls_ecp_group *grp, | |
const int pf, | |
const mbedtls_ecp_point *G, | |
mbedtls_ecp_point *Xa, | |
mbedtls_ecp_point *Xb, | |
const char *id, | |
const unsigned char *buf, | |
size_t len ) | |
{ | |
int ret; | |
const unsigned char *p = buf; | |
const unsigned char *end = buf + len; | |
/* | |
* struct { | |
* ECJPAKEKeyKP ecjpake_key_kp_pair_list[2]; | |
* } ECJPAKEKeyKPPairList; | |
*/ | |
MBEDTLS_MPI_CHK( ecjpake_kkp_read( md_info, grp, pf, G, Xa, id, &p, end ) ); | |
MBEDTLS_MPI_CHK( ecjpake_kkp_read( md_info, grp, pf, G, Xb, id, &p, end ) ); | |
if( p != end ) | |
ret = MBEDTLS_ERR_ECP_BAD_INPUT_DATA; | |
cleanup: | |
return( ret ); | |
} | |
/* | |
* Generate a ECJPAKEKeyKPPairList | |
* Outputs: the serialized structure, plus two private/public key pairs | |
*/ | |
static int ecjpake_kkpp_write( const mbedtls_md_info_t *md_info, | |
const mbedtls_ecp_group *grp, | |
const int pf, | |
const mbedtls_ecp_point *G, | |
mbedtls_mpi *xm1, | |
mbedtls_ecp_point *Xa, | |
mbedtls_mpi *xm2, | |
mbedtls_ecp_point *Xb, | |
const char *id, | |
unsigned char *buf, | |
size_t len, | |
size_t *olen, | |
int (*f_rng)(void *, unsigned char *, size_t), | |
void *p_rng ) | |
{ | |
int ret; | |
unsigned char *p = buf; | |
const unsigned char *end = buf + len; | |
MBEDTLS_MPI_CHK( ecjpake_kkp_write( md_info, grp, pf, G, xm1, Xa, id, | |
&p, end, f_rng, p_rng ) ); | |
MBEDTLS_MPI_CHK( ecjpake_kkp_write( md_info, grp, pf, G, xm2, Xb, id, | |
&p, end, f_rng, p_rng ) ); | |
*olen = p - buf; | |
cleanup: | |
return( ret ); | |
} | |
/* | |
* Read and process the first round message | |
*/ | |
int mbedtls_ecjpake_read_round_one( mbedtls_ecjpake_context *ctx, | |
const unsigned char *buf, | |
size_t len ) | |
{ | |
ECJPAKE_VALIDATE_RET( ctx != NULL ); | |
ECJPAKE_VALIDATE_RET( buf != NULL ); | |
return( ecjpake_kkpp_read( ctx->md_info, &ctx->grp, ctx->point_format, | |
&ctx->grp.G, | |
&ctx->Xp1, &ctx->Xp2, ID_PEER, | |
buf, len ) ); | |
} | |
/* | |
* Generate and write the first round message | |
*/ | |
int mbedtls_ecjpake_write_round_one( mbedtls_ecjpake_context *ctx, | |
unsigned char *buf, size_t len, size_t *olen, | |
int (*f_rng)(void *, unsigned char *, size_t), | |
void *p_rng ) | |
{ | |
ECJPAKE_VALIDATE_RET( ctx != NULL ); | |
ECJPAKE_VALIDATE_RET( buf != NULL ); | |
ECJPAKE_VALIDATE_RET( olen != NULL ); | |
ECJPAKE_VALIDATE_RET( f_rng != NULL ); | |
return( ecjpake_kkpp_write( ctx->md_info, &ctx->grp, ctx->point_format, | |
&ctx->grp.G, | |
&ctx->xm1, &ctx->Xm1, &ctx->xm2, &ctx->Xm2, | |
ID_MINE, buf, len, olen, f_rng, p_rng ) ); | |
} | |
/* | |
* Compute the sum of three points R = A + B + C | |
*/ | |
static int ecjpake_ecp_add3( mbedtls_ecp_group *grp, mbedtls_ecp_point *R, | |
const mbedtls_ecp_point *A, | |
const mbedtls_ecp_point *B, | |
const mbedtls_ecp_point *C ) | |
{ | |
int ret; | |
mbedtls_mpi one; | |
mbedtls_mpi_init( &one ); | |
MBEDTLS_MPI_CHK( mbedtls_mpi_lset( &one, 1 ) ); | |
MBEDTLS_MPI_CHK( mbedtls_ecp_muladd( grp, R, &one, A, &one, B ) ); | |
MBEDTLS_MPI_CHK( mbedtls_ecp_muladd( grp, R, &one, R, &one, C ) ); | |
cleanup: | |
mbedtls_mpi_free( &one ); | |
return( ret ); | |
} | |
/* | |
* Read and process second round message (C: 7.4.2.5, S: 7.4.2.6) | |
*/ | |
int mbedtls_ecjpake_read_round_two( mbedtls_ecjpake_context *ctx, | |
const unsigned char *buf, | |
size_t len ) | |
{ | |
int ret; | |
const unsigned char *p = buf; | |
const unsigned char *end = buf + len; | |
mbedtls_ecp_group grp; | |
mbedtls_ecp_point G; /* C: GB, S: GA */ | |
ECJPAKE_VALIDATE_RET( ctx != NULL ); | |
ECJPAKE_VALIDATE_RET( buf != NULL ); | |
mbedtls_ecp_group_init( &grp ); | |
mbedtls_ecp_point_init( &G ); | |
/* | |
* Server: GA = X3 + X4 + X1 (7.4.2.6.1) | |
* Client: GB = X1 + X2 + X3 (7.4.2.5.1) | |
* Unified: G = Xm1 + Xm2 + Xp1 | |
* We need that before parsing in order to check Xp as we read it | |
*/ | |
MBEDTLS_MPI_CHK( ecjpake_ecp_add3( &ctx->grp, &G, | |
&ctx->Xm1, &ctx->Xm2, &ctx->Xp1 ) ); | |
/* | |
* struct { | |
* ECParameters curve_params; // only client reading server msg | |
* ECJPAKEKeyKP ecjpake_key_kp; | |
* } Client/ServerECJPAKEParams; | |
*/ | |
if( ctx->role == MBEDTLS_ECJPAKE_CLIENT ) | |
{ | |
MBEDTLS_MPI_CHK( mbedtls_ecp_tls_read_group( &grp, &p, len ) ); | |
if( grp.id != ctx->grp.id ) | |
{ | |
ret = MBEDTLS_ERR_ECP_FEATURE_UNAVAILABLE; | |
goto cleanup; | |
} | |
} | |
MBEDTLS_MPI_CHK( ecjpake_kkp_read( ctx->md_info, &ctx->grp, | |
ctx->point_format, | |
&G, &ctx->Xp, ID_PEER, &p, end ) ); | |
if( p != end ) | |
{ | |
ret = MBEDTLS_ERR_ECP_BAD_INPUT_DATA; | |
goto cleanup; | |
} | |
cleanup: | |
mbedtls_ecp_group_free( &grp ); | |
mbedtls_ecp_point_free( &G ); | |
return( ret ); | |
} | |
/* | |
* Compute R = +/- X * S mod N, taking care not to leak S | |
*/ | |
static int ecjpake_mul_secret( mbedtls_mpi *R, int sign, | |
const mbedtls_mpi *X, | |
const mbedtls_mpi *S, | |
const mbedtls_mpi *N, | |
int (*f_rng)(void *, unsigned char *, size_t), | |
void *p_rng ) | |
{ | |
int ret; | |
mbedtls_mpi b; /* Blinding value, then s + N * blinding */ | |
mbedtls_mpi_init( &b ); | |
/* b = s + rnd-128-bit * N */ | |
MBEDTLS_MPI_CHK( mbedtls_mpi_fill_random( &b, 16, f_rng, p_rng ) ); | |
MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( &b, &b, N ) ); | |
MBEDTLS_MPI_CHK( mbedtls_mpi_add_mpi( &b, &b, S ) ); | |
/* R = sign * X * b mod N */ | |
MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( R, X, &b ) ); | |
R->s *= sign; | |
MBEDTLS_MPI_CHK( mbedtls_mpi_mod_mpi( R, R, N ) ); | |
cleanup: | |
mbedtls_mpi_free( &b ); | |
return( ret ); | |
} | |
/* | |
* Generate and write the second round message (S: 7.4.2.5, C: 7.4.2.6) | |
*/ | |
int mbedtls_ecjpake_write_round_two( mbedtls_ecjpake_context *ctx, | |
unsigned char *buf, size_t len, size_t *olen, | |
int (*f_rng)(void *, unsigned char *, size_t), | |
void *p_rng ) | |
{ | |
int ret; | |
mbedtls_ecp_point G; /* C: GA, S: GB */ | |
mbedtls_ecp_point Xm; /* C: Xc, S: Xs */ | |
mbedtls_mpi xm; /* C: xc, S: xs */ | |
unsigned char *p = buf; | |
const unsigned char *end = buf + len; | |
size_t ec_len; | |
ECJPAKE_VALIDATE_RET( ctx != NULL ); | |
ECJPAKE_VALIDATE_RET( buf != NULL ); | |
ECJPAKE_VALIDATE_RET( olen != NULL ); | |
ECJPAKE_VALIDATE_RET( f_rng != NULL ); | |
mbedtls_ecp_point_init( &G ); | |
mbedtls_ecp_point_init( &Xm ); | |
mbedtls_mpi_init( &xm ); | |
/* | |
* First generate private/public key pair (S: 7.4.2.5.1, C: 7.4.2.6.1) | |
* | |
* Client: GA = X1 + X3 + X4 | xs = x2 * s | Xc = xc * GA | |
* Server: GB = X3 + X1 + X2 | xs = x4 * s | Xs = xs * GB | |
* Unified: G = Xm1 + Xp1 + Xp2 | xm = xm2 * s | Xm = xm * G | |
*/ | |
MBEDTLS_MPI_CHK( ecjpake_ecp_add3( &ctx->grp, &G, | |
&ctx->Xp1, &ctx->Xp2, &ctx->Xm1 ) ); | |
MBEDTLS_MPI_CHK( ecjpake_mul_secret( &xm, 1, &ctx->xm2, &ctx->s, | |
&ctx->grp.N, f_rng, p_rng ) ); | |
MBEDTLS_MPI_CHK( mbedtls_ecp_mul( &ctx->grp, &Xm, &xm, &G, f_rng, p_rng ) ); | |
/* | |
* Now write things out | |
* | |
* struct { | |
* ECParameters curve_params; // only server writing its message | |
* ECJPAKEKeyKP ecjpake_key_kp; | |
* } Client/ServerECJPAKEParams; | |
*/ | |
if( ctx->role == MBEDTLS_ECJPAKE_SERVER ) | |
{ | |
if( end < p ) | |
{ | |
ret = MBEDTLS_ERR_ECP_BUFFER_TOO_SMALL; | |
goto cleanup; | |
} | |
MBEDTLS_MPI_CHK( mbedtls_ecp_tls_write_group( &ctx->grp, &ec_len, | |
p, end - p ) ); | |
p += ec_len; | |
} | |
if( end < p ) | |
{ | |
ret = MBEDTLS_ERR_ECP_BUFFER_TOO_SMALL; | |
goto cleanup; | |
} | |
MBEDTLS_MPI_CHK( mbedtls_ecp_tls_write_point( &ctx->grp, &Xm, | |
ctx->point_format, &ec_len, p, end - p ) ); | |
p += ec_len; | |
MBEDTLS_MPI_CHK( ecjpake_zkp_write( ctx->md_info, &ctx->grp, | |
ctx->point_format, | |
&G, &xm, &Xm, ID_MINE, | |
&p, end, f_rng, p_rng ) ); | |
*olen = p - buf; | |
cleanup: | |
mbedtls_ecp_point_free( &G ); | |
mbedtls_ecp_point_free( &Xm ); | |
mbedtls_mpi_free( &xm ); | |
return( ret ); | |
} | |
/* | |
* Derive PMS (7.4.2.7 / 7.4.2.8) | |
*/ | |
int mbedtls_ecjpake_derive_secret( mbedtls_ecjpake_context *ctx, | |
unsigned char *buf, size_t len, size_t *olen, | |
int (*f_rng)(void *, unsigned char *, size_t), | |
void *p_rng ) | |
{ | |
int ret; | |
mbedtls_ecp_point K; | |
mbedtls_mpi m_xm2_s, one; | |
unsigned char kx[MBEDTLS_ECP_MAX_BYTES]; | |
size_t x_bytes; | |
ECJPAKE_VALIDATE_RET( ctx != NULL ); | |
ECJPAKE_VALIDATE_RET( buf != NULL ); | |
ECJPAKE_VALIDATE_RET( olen != NULL ); | |
ECJPAKE_VALIDATE_RET( f_rng != NULL ); | |
*olen = mbedtls_md_get_size( ctx->md_info ); | |
if( len < *olen ) | |
return( MBEDTLS_ERR_ECP_BUFFER_TOO_SMALL ); | |
mbedtls_ecp_point_init( &K ); | |
mbedtls_mpi_init( &m_xm2_s ); | |
mbedtls_mpi_init( &one ); | |
MBEDTLS_MPI_CHK( mbedtls_mpi_lset( &one, 1 ) ); | |
/* | |
* Client: K = ( Xs - X4 * x2 * s ) * x2 | |
* Server: K = ( Xc - X2 * x4 * s ) * x4 | |
* Unified: K = ( Xp - Xp2 * xm2 * s ) * xm2 | |
*/ | |
MBEDTLS_MPI_CHK( ecjpake_mul_secret( &m_xm2_s, -1, &ctx->xm2, &ctx->s, | |
&ctx->grp.N, f_rng, p_rng ) ); | |
MBEDTLS_MPI_CHK( mbedtls_ecp_muladd( &ctx->grp, &K, | |
&one, &ctx->Xp, | |
&m_xm2_s, &ctx->Xp2 ) ); | |
MBEDTLS_MPI_CHK( mbedtls_ecp_mul( &ctx->grp, &K, &ctx->xm2, &K, | |
f_rng, p_rng ) ); | |
/* PMS = SHA-256( K.X ) */ | |
x_bytes = ( ctx->grp.pbits + 7 ) / 8; | |
MBEDTLS_MPI_CHK( mbedtls_mpi_write_binary( &K.X, kx, x_bytes ) ); | |
MBEDTLS_MPI_CHK( mbedtls_md( ctx->md_info, kx, x_bytes, buf ) ); | |
cleanup: | |
mbedtls_ecp_point_free( &K ); | |
mbedtls_mpi_free( &m_xm2_s ); | |
mbedtls_mpi_free( &one ); | |
return( ret ); | |
} | |
#undef ID_MINE | |
#undef ID_PEER | |
#endif /* ! MBEDTLS_ECJPAKE_ALT */ | |
#if defined(MBEDTLS_SELF_TEST) | |
#if defined(MBEDTLS_PLATFORM_C) | |
#include "mbedtls/platform.h" | |
#else | |
#include <stdio.h> | |
#define mbedtls_printf printf | |
#endif | |
#if !defined(MBEDTLS_ECP_DP_SECP256R1_ENABLED) || \ | |
!defined(MBEDTLS_SHA256_C) | |
int mbedtls_ecjpake_self_test( int verbose ) | |
{ | |
(void) verbose; | |
return( 0 ); | |
} | |
#else | |
static const unsigned char ecjpake_test_password[] = { | |
0x74, 0x68, 0x72, 0x65, 0x61, 0x64, 0x6a, 0x70, 0x61, 0x6b, 0x65, 0x74, | |
0x65, 0x73, 0x74 | |
}; | |
static const unsigned char ecjpake_test_x1[] = { | |
0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, | |
0x0d, 0x0e, 0x0f, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, | |
0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, 0x21 | |
}; | |
static const unsigned char ecjpake_test_x2[] = { | |
0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x6b, 0x6c, | |
0x6d, 0x6e, 0x6f, 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, | |
0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, 0x81 | |
}; | |
static const unsigned char ecjpake_test_x3[] = { | |
0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x6b, 0x6c, | |
0x6d, 0x6e, 0x6f, 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, | |
0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, 0x81 | |
}; | |
static const unsigned char ecjpake_test_x4[] = { | |
0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xcb, 0xcc, | |
0xcd, 0xce, 0xcf, 0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, | |
0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf, 0xe1 | |
}; | |
static const unsigned char ecjpake_test_cli_one[] = { | |
0x41, 0x04, 0xac, 0xcf, 0x01, 0x06, 0xef, 0x85, 0x8f, 0xa2, 0xd9, 0x19, | |
0x33, 0x13, 0x46, 0x80, 0x5a, 0x78, 0xb5, 0x8b, 0xba, 0xd0, 0xb8, 0x44, | |
0xe5, 0xc7, 0x89, 0x28, 0x79, 0x14, 0x61, 0x87, 0xdd, 0x26, 0x66, 0xad, | |
0xa7, 0x81, 0xbb, 0x7f, 0x11, 0x13, 0x72, 0x25, 0x1a, 0x89, 0x10, 0x62, | |
0x1f, 0x63, 0x4d, 0xf1, 0x28, 0xac, 0x48, 0xe3, 0x81, 0xfd, 0x6e, 0xf9, | |
0x06, 0x07, 0x31, 0xf6, 0x94, 0xa4, 0x41, 0x04, 0x1d, 0xd0, 0xbd, 0x5d, | |
0x45, 0x66, 0xc9, 0xbe, 0xd9, 0xce, 0x7d, 0xe7, 0x01, 0xb5, 0xe8, 0x2e, | |
0x08, 0xe8, 0x4b, 0x73, 0x04, 0x66, 0x01, 0x8a, 0xb9, 0x03, 0xc7, 0x9e, | |
0xb9, 0x82, 0x17, 0x22, 0x36, 0xc0, 0xc1, 0x72, 0x8a, 0xe4, 0xbf, 0x73, | |
0x61, 0x0d, 0x34, 0xde, 0x44, 0x24, 0x6e, 0xf3, 0xd9, 0xc0, 0x5a, 0x22, | |
0x36, 0xfb, 0x66, 0xa6, 0x58, 0x3d, 0x74, 0x49, 0x30, 0x8b, 0xab, 0xce, | |
0x20, 0x72, 0xfe, 0x16, 0x66, 0x29, 0x92, 0xe9, 0x23, 0x5c, 0x25, 0x00, | |
0x2f, 0x11, 0xb1, 0x50, 0x87, 0xb8, 0x27, 0x38, 0xe0, 0x3c, 0x94, 0x5b, | |
0xf7, 0xa2, 0x99, 0x5d, 0xda, 0x1e, 0x98, 0x34, 0x58, 0x41, 0x04, 0x7e, | |
0xa6, 0xe3, 0xa4, 0x48, 0x70, 0x37, 0xa9, 0xe0, 0xdb, 0xd7, 0x92, 0x62, | |
0xb2, 0xcc, 0x27, 0x3e, 0x77, 0x99, 0x30, 0xfc, 0x18, 0x40, 0x9a, 0xc5, | |
0x36, 0x1c, 0x5f, 0xe6, 0x69, 0xd7, 0x02, 0xe1, 0x47, 0x79, 0x0a, 0xeb, | |
0x4c, 0xe7, 0xfd, 0x65, 0x75, 0xab, 0x0f, 0x6c, 0x7f, 0xd1, 0xc3, 0x35, | |
0x93, 0x9a, 0xa8, 0x63, 0xba, 0x37, 0xec, 0x91, 0xb7, 0xe3, 0x2b, 0xb0, | |
0x13, 0xbb, 0x2b, 0x41, 0x04, 0xa4, 0x95, 0x58, 0xd3, 0x2e, 0xd1, 0xeb, | |
0xfc, 0x18, 0x16, 0xaf, 0x4f, 0xf0, 0x9b, 0x55, 0xfc, 0xb4, 0xca, 0x47, | |
0xb2, 0xa0, 0x2d, 0x1e, 0x7c, 0xaf, 0x11, 0x79, 0xea, 0x3f, 0xe1, 0x39, | |
0x5b, 0x22, 0xb8, 0x61, 0x96, 0x40, 0x16, 0xfa, 0xba, 0xf7, 0x2c, 0x97, | |
0x56, 0x95, 0xd9, 0x3d, 0x4d, 0xf0, 0xe5, 0x19, 0x7f, 0xe9, 0xf0, 0x40, | |
0x63, 0x4e, 0xd5, 0x97, 0x64, 0x93, 0x77, 0x87, 0xbe, 0x20, 0xbc, 0x4d, | |
0xee, 0xbb, 0xf9, 0xb8, 0xd6, 0x0a, 0x33, 0x5f, 0x04, 0x6c, 0xa3, 0xaa, | |
0x94, 0x1e, 0x45, 0x86, 0x4c, 0x7c, 0xad, 0xef, 0x9c, 0xf7, 0x5b, 0x3d, | |
0x8b, 0x01, 0x0e, 0x44, 0x3e, 0xf0 | |
}; | |
static const unsigned char ecjpake_test_srv_one[] = { | |
0x41, 0x04, 0x7e, 0xa6, 0xe3, 0xa4, 0x48, 0x70, 0x37, 0xa9, 0xe0, 0xdb, | |
0xd7, 0x92, 0x62, 0xb2, 0xcc, 0x27, 0x3e, 0x77, 0x99, 0x30, 0xfc, 0x18, | |
0x40, 0x9a, 0xc5, 0x36, 0x1c, 0x5f, 0xe6, 0x69, 0xd7, 0x02, 0xe1, 0x47, | |
0x79, 0x0a, 0xeb, 0x4c, 0xe7, 0xfd, 0x65, 0x75, 0xab, 0x0f, 0x6c, 0x7f, | |
0xd1, 0xc3, 0x35, 0x93, 0x9a, 0xa8, 0x63, 0xba, 0x37, 0xec, 0x91, 0xb7, | |
0xe3, 0x2b, 0xb0, 0x13, 0xbb, 0x2b, 0x41, 0x04, 0x09, 0xf8, 0x5b, 0x3d, | |
0x20, 0xeb, 0xd7, 0x88, 0x5c, 0xe4, 0x64, 0xc0, 0x8d, 0x05, 0x6d, 0x64, | |
0x28, 0xfe, 0x4d, 0xd9, 0x28, 0x7a, 0xa3, 0x65, 0xf1, 0x31, 0xf4, 0x36, | |
0x0f, 0xf3, 0x86, 0xd8, 0x46, 0x89, 0x8b, 0xc4, 0xb4, 0x15, 0x83, 0xc2, | |
0xa5, 0x19, 0x7f, 0x65, 0xd7, 0x87, 0x42, 0x74, 0x6c, 0x12, 0xa5, 0xec, | |
0x0a, 0x4f, 0xfe, 0x2f, 0x27, 0x0a, 0x75, 0x0a, 0x1d, 0x8f, 0xb5, 0x16, | |
0x20, 0x93, 0x4d, 0x74, 0xeb, 0x43, 0xe5, 0x4d, 0xf4, 0x24, 0xfd, 0x96, | |
0x30, 0x6c, 0x01, 0x17, 0xbf, 0x13, 0x1a, 0xfa, 0xbf, 0x90, 0xa9, 0xd3, | |
0x3d, 0x11, 0x98, 0xd9, 0x05, 0x19, 0x37, 0x35, 0x14, 0x41, 0x04, 0x19, | |
0x0a, 0x07, 0x70, 0x0f, 0xfa, 0x4b, 0xe6, 0xae, 0x1d, 0x79, 0xee, 0x0f, | |
0x06, 0xae, 0xb5, 0x44, 0xcd, 0x5a, 0xdd, 0xaa, 0xbe, 0xdf, 0x70, 0xf8, | |
0x62, 0x33, 0x21, 0x33, 0x2c, 0x54, 0xf3, 0x55, 0xf0, 0xfb, 0xfe, 0xc7, | |
0x83, 0xed, 0x35, 0x9e, 0x5d, 0x0b, 0xf7, 0x37, 0x7a, 0x0f, 0xc4, 0xea, | |
0x7a, 0xce, 0x47, 0x3c, 0x9c, 0x11, 0x2b, 0x41, 0xcc, 0xd4, 0x1a, 0xc5, | |
0x6a, 0x56, 0x12, 0x41, 0x04, 0x36, 0x0a, 0x1c, 0xea, 0x33, 0xfc, 0xe6, | |
0x41, 0x15, 0x64, 0x58, 0xe0, 0xa4, 0xea, 0xc2, 0x19, 0xe9, 0x68, 0x31, | |
0xe6, 0xae, 0xbc, 0x88, 0xb3, 0xf3, 0x75, 0x2f, 0x93, 0xa0, 0x28, 0x1d, | |
0x1b, 0xf1, 0xfb, 0x10, 0x60, 0x51, 0xdb, 0x96, 0x94, 0xa8, 0xd6, 0xe8, | |
0x62, 0xa5, 0xef, 0x13, 0x24, 0xa3, 0xd9, 0xe2, 0x78, 0x94, 0xf1, 0xee, | |
0x4f, 0x7c, 0x59, 0x19, 0x99, 0x65, 0xa8, 0xdd, 0x4a, 0x20, 0x91, 0x84, | |
0x7d, 0x2d, 0x22, 0xdf, 0x3e, 0xe5, 0x5f, 0xaa, 0x2a, 0x3f, 0xb3, 0x3f, | |
0xd2, 0xd1, 0xe0, 0x55, 0xa0, 0x7a, 0x7c, 0x61, 0xec, 0xfb, 0x8d, 0x80, | |
0xec, 0x00, 0xc2, 0xc9, 0xeb, 0x12 | |
}; | |
static const unsigned char ecjpake_test_srv_two[] = { | |
0x03, 0x00, 0x17, 0x41, 0x04, 0x0f, 0xb2, 0x2b, 0x1d, 0x5d, 0x11, 0x23, | |
0xe0, 0xef, 0x9f, 0xeb, 0x9d, 0x8a, 0x2e, 0x59, 0x0a, 0x1f, 0x4d, 0x7c, | |
0xed, 0x2c, 0x2b, 0x06, 0x58, 0x6e, 0x8f, 0x2a, 0x16, 0xd4, 0xeb, 0x2f, | |
0xda, 0x43, 0x28, 0xa2, 0x0b, 0x07, 0xd8, 0xfd, 0x66, 0x76, 0x54, 0xca, | |
0x18, 0xc5, 0x4e, 0x32, 0xa3, 0x33, 0xa0, 0x84, 0x54, 0x51, 0xe9, 0x26, | |
0xee, 0x88, 0x04, 0xfd, 0x7a, 0xf0, 0xaa, 0xa7, 0xa6, 0x41, 0x04, 0x55, | |
0x16, 0xea, 0x3e, 0x54, 0xa0, 0xd5, 0xd8, 0xb2, 0xce, 0x78, 0x6b, 0x38, | |
0xd3, 0x83, 0x37, 0x00, 0x29, 0xa5, 0xdb, 0xe4, 0x45, 0x9c, 0x9d, 0xd6, | |
0x01, 0xb4, 0x08, 0xa2, 0x4a, 0xe6, 0x46, 0x5c, 0x8a, 0xc9, 0x05, 0xb9, | |
0xeb, 0x03, 0xb5, 0xd3, 0x69, 0x1c, 0x13, 0x9e, 0xf8, 0x3f, 0x1c, 0xd4, | |
0x20, 0x0f, 0x6c, 0x9c, 0xd4, 0xec, 0x39, 0x22, 0x18, 0xa5, 0x9e, 0xd2, | |
0x43, 0xd3, 0xc8, 0x20, 0xff, 0x72, 0x4a, 0x9a, 0x70, 0xb8, 0x8c, 0xb8, | |
0x6f, 0x20, 0xb4, 0x34, 0xc6, 0x86, 0x5a, 0xa1, 0xcd, 0x79, 0x06, 0xdd, | |
0x7c, 0x9b, 0xce, 0x35, 0x25, 0xf5, 0x08, 0x27, 0x6f, 0x26, 0x83, 0x6c | |
}; | |
static const unsigned char ecjpake_test_cli_two[] = { | |
0x41, 0x04, 0x69, 0xd5, 0x4e, 0xe8, 0x5e, 0x90, 0xce, 0x3f, 0x12, 0x46, | |
0x74, 0x2d, 0xe5, 0x07, 0xe9, 0x39, 0xe8, 0x1d, 0x1d, 0xc1, 0xc5, 0xcb, | |
0x98, 0x8b, 0x58, 0xc3, 0x10, 0xc9, 0xfd, 0xd9, 0x52, 0x4d, 0x93, 0x72, | |
0x0b, 0x45, 0x54, 0x1c, 0x83, 0xee, 0x88, 0x41, 0x19, 0x1d, 0xa7, 0xce, | |
0xd8, 0x6e, 0x33, 0x12, 0xd4, 0x36, 0x23, 0xc1, 0xd6, 0x3e, 0x74, 0x98, | |
0x9a, 0xba, 0x4a, 0xff, 0xd1, 0xee, 0x41, 0x04, 0x07, 0x7e, 0x8c, 0x31, | |
0xe2, 0x0e, 0x6b, 0xed, 0xb7, 0x60, 0xc1, 0x35, 0x93, 0xe6, 0x9f, 0x15, | |
0xbe, 0x85, 0xc2, 0x7d, 0x68, 0xcd, 0x09, 0xcc, 0xb8, 0xc4, 0x18, 0x36, | |
0x08, 0x91, 0x7c, 0x5c, 0x3d, 0x40, 0x9f, 0xac, 0x39, 0xfe, 0xfe, 0xe8, | |
0x2f, 0x72, 0x92, 0xd3, 0x6f, 0x0d, 0x23, 0xe0, 0x55, 0x91, 0x3f, 0x45, | |
0xa5, 0x2b, 0x85, 0xdd, 0x8a, 0x20, 0x52, 0xe9, 0xe1, 0x29, 0xbb, 0x4d, | |
0x20, 0x0f, 0x01, 0x1f, 0x19, 0x48, 0x35, 0x35, 0xa6, 0xe8, 0x9a, 0x58, | |
0x0c, 0x9b, 0x00, 0x03, 0xba, 0xf2, 0x14, 0x62, 0xec, 0xe9, 0x1a, 0x82, | |
0xcc, 0x38, 0xdb, 0xdc, 0xae, 0x60, 0xd9, 0xc5, 0x4c | |
}; | |
static const unsigned char ecjpake_test_pms[] = { | |
0xf3, 0xd4, 0x7f, 0x59, 0x98, 0x44, 0xdb, 0x92, 0xa5, 0x69, 0xbb, 0xe7, | |
0x98, 0x1e, 0x39, 0xd9, 0x31, 0xfd, 0x74, 0x3b, 0xf2, 0x2e, 0x98, 0xf9, | |
0xb4, 0x38, 0xf7, 0x19, 0xd3, 0xc4, 0xf3, 0x51 | |
}; | |
/* Load my private keys and generate the corresponding public keys */ | |
static int ecjpake_test_load( mbedtls_ecjpake_context *ctx, | |
const unsigned char *xm1, size_t len1, | |
const unsigned char *xm2, size_t len2 ) | |
{ | |
int ret; | |
MBEDTLS_MPI_CHK( mbedtls_mpi_read_binary( &ctx->xm1, xm1, len1 ) ); | |
MBEDTLS_MPI_CHK( mbedtls_mpi_read_binary( &ctx->xm2, xm2, len2 ) ); | |
MBEDTLS_MPI_CHK( mbedtls_ecp_mul( &ctx->grp, &ctx->Xm1, &ctx->xm1, | |
&ctx->grp.G, NULL, NULL ) ); | |
MBEDTLS_MPI_CHK( mbedtls_ecp_mul( &ctx->grp, &ctx->Xm2, &ctx->xm2, | |
&ctx->grp.G, NULL, NULL ) ); | |
cleanup: | |
return( ret ); | |
} | |
/* For tests we don't need a secure RNG; | |
* use the LGC from Numerical Recipes for simplicity */ | |
static int ecjpake_lgc( void *p, unsigned char *out, size_t len ) | |
{ | |
static uint32_t x = 42; | |
(void) p; | |
while( len > 0 ) | |
{ | |
size_t use_len = len > 4 ? 4 : len; | |
x = 1664525 * x + 1013904223; | |
memcpy( out, &x, use_len ); | |
out += use_len; | |
len -= use_len; | |
} | |
return( 0 ); | |
} | |
#define TEST_ASSERT( x ) \ | |
do { \ | |
if( x ) \ | |
ret = 0; \ | |
else \ | |
{ \ | |
ret = 1; \ | |
goto cleanup; \ | |
} \ | |
} while( 0 ) | |
/* | |
* Checkup routine | |
*/ | |
int mbedtls_ecjpake_self_test( int verbose ) | |
{ | |
int ret; | |
mbedtls_ecjpake_context cli; | |
mbedtls_ecjpake_context srv; | |
unsigned char buf[512], pms[32]; | |
size_t len, pmslen; | |
mbedtls_ecjpake_init( &cli ); | |
mbedtls_ecjpake_init( &srv ); | |
if( verbose != 0 ) | |
mbedtls_printf( " ECJPAKE test #0 (setup): " ); | |
TEST_ASSERT( mbedtls_ecjpake_setup( &cli, MBEDTLS_ECJPAKE_CLIENT, | |
MBEDTLS_MD_SHA256, MBEDTLS_ECP_DP_SECP256R1, | |
ecjpake_test_password, | |
sizeof( ecjpake_test_password ) ) == 0 ); | |
TEST_ASSERT( mbedtls_ecjpake_setup( &srv, MBEDTLS_ECJPAKE_SERVER, | |
MBEDTLS_MD_SHA256, MBEDTLS_ECP_DP_SECP256R1, | |
ecjpake_test_password, | |
sizeof( ecjpake_test_password ) ) == 0 ); | |
if( verbose != 0 ) | |
mbedtls_printf( "passed\n" ); | |
if( verbose != 0 ) | |
mbedtls_printf( " ECJPAKE test #1 (random handshake): " ); | |
TEST_ASSERT( mbedtls_ecjpake_write_round_one( &cli, | |
buf, sizeof( buf ), &len, ecjpake_lgc, NULL ) == 0 ); | |
TEST_ASSERT( mbedtls_ecjpake_read_round_one( &srv, buf, len ) == 0 ); | |
TEST_ASSERT( mbedtls_ecjpake_write_round_one( &srv, | |
buf, sizeof( buf ), &len, ecjpake_lgc, NULL ) == 0 ); | |
TEST_ASSERT( mbedtls_ecjpake_read_round_one( &cli, buf, len ) == 0 ); | |
TEST_ASSERT( mbedtls_ecjpake_write_round_two( &srv, | |
buf, sizeof( buf ), &len, ecjpake_lgc, NULL ) == 0 ); | |
TEST_ASSERT( mbedtls_ecjpake_read_round_two( &cli, buf, len ) == 0 ); | |
TEST_ASSERT( mbedtls_ecjpake_derive_secret( &cli, | |
pms, sizeof( pms ), &pmslen, ecjpake_lgc, NULL ) == 0 ); | |
TEST_ASSERT( mbedtls_ecjpake_write_round_two( &cli, | |
buf, sizeof( buf ), &len, ecjpake_lgc, NULL ) == 0 ); | |
TEST_ASSERT( mbedtls_ecjpake_read_round_two( &srv, buf, len ) == 0 ); | |
TEST_ASSERT( mbedtls_ecjpake_derive_secret( &srv, | |
buf, sizeof( buf ), &len, ecjpake_lgc, NULL ) == 0 ); | |
TEST_ASSERT( len == pmslen ); | |
TEST_ASSERT( memcmp( buf, pms, len ) == 0 ); | |
if( verbose != 0 ) | |
mbedtls_printf( "passed\n" ); | |
if( verbose != 0 ) | |
mbedtls_printf( " ECJPAKE test #2 (reference handshake): " ); | |
/* Simulate generation of round one */ | |
MBEDTLS_MPI_CHK( ecjpake_test_load( &cli, | |
ecjpake_test_x1, sizeof( ecjpake_test_x1 ), | |
ecjpake_test_x2, sizeof( ecjpake_test_x2 ) ) ); | |
MBEDTLS_MPI_CHK( ecjpake_test_load( &srv, | |
ecjpake_test_x3, sizeof( ecjpake_test_x3 ), | |
ecjpake_test_x4, sizeof( ecjpake_test_x4 ) ) ); | |
/* Read round one */ | |
TEST_ASSERT( mbedtls_ecjpake_read_round_one( &srv, | |
ecjpake_test_cli_one, | |
sizeof( ecjpake_test_cli_one ) ) == 0 ); | |
TEST_ASSERT( mbedtls_ecjpake_read_round_one( &cli, | |
ecjpake_test_srv_one, | |
sizeof( ecjpake_test_srv_one ) ) == 0 ); | |
/* Skip generation of round two, read round two */ | |
TEST_ASSERT( mbedtls_ecjpake_read_round_two( &cli, | |
ecjpake_test_srv_two, | |
sizeof( ecjpake_test_srv_two ) ) == 0 ); | |
TEST_ASSERT( mbedtls_ecjpake_read_round_two( &srv, | |
ecjpake_test_cli_two, | |
sizeof( ecjpake_test_cli_two ) ) == 0 ); | |
/* Server derives PMS */ | |
TEST_ASSERT( mbedtls_ecjpake_derive_secret( &srv, | |
buf, sizeof( buf ), &len, ecjpake_lgc, NULL ) == 0 ); | |
TEST_ASSERT( len == sizeof( ecjpake_test_pms ) ); | |
TEST_ASSERT( memcmp( buf, ecjpake_test_pms, len ) == 0 ); | |
memset( buf, 0, len ); /* Avoid interferences with next step */ | |
/* Client derives PMS */ | |
TEST_ASSERT( mbedtls_ecjpake_derive_secret( &cli, | |
buf, sizeof( buf ), &len, ecjpake_lgc, NULL ) == 0 ); | |
TEST_ASSERT( len == sizeof( ecjpake_test_pms ) ); | |
TEST_ASSERT( memcmp( buf, ecjpake_test_pms, len ) == 0 ); | |
if( verbose != 0 ) | |
mbedtls_printf( "passed\n" ); | |
cleanup: | |
mbedtls_ecjpake_free( &cli ); | |
mbedtls_ecjpake_free( &srv ); | |
if( ret != 0 ) | |
{ | |
if( verbose != 0 ) | |
mbedtls_printf( "failed\n" ); | |
ret = 1; | |
} | |
if( verbose != 0 ) | |
mbedtls_printf( "\n" ); | |
return( ret ); | |
} | |
#undef TEST_ASSERT | |
#endif /* MBEDTLS_ECP_DP_SECP256R1_ENABLED && MBEDTLS_SHA256_C */ | |
#endif /* MBEDTLS_SELF_TEST */ | |
#endif /* MBEDTLS_ECJPAKE_C */ |