mirror of
https://github.com/yuzu-emu/mbedtls.git
synced 2024-11-22 13:05:41 +01:00
First draft of ecjpake_write_zkp()
This commit is contained in:
Manuel Pégourié-Gonnard
parent
3dbf2fbb89
commit
8489f17277
@ -20,8 +20,8 @@
|
||||
*/
|
||||
|
||||
/*
|
||||
* EC-JPAKE is defined in Chapter 7.4 of the Thread specification.
|
||||
* References below are base on the draft-1.0.0 spec.
|
||||
* We implement EC-JPAKE as defined in Chapter 7.4 of the Thread v1.0
|
||||
* Specification. References below are to this document.
|
||||
*/
|
||||
|
||||
#if !defined(MBEDTLS_CONFIG_FILE)
|
||||
@ -87,7 +87,7 @@ static int ecjpake_hash( const mbedtls_md_info_t *md_info,
|
||||
unsigned char buf[ECJPAKE_HASH_BUF_LEN];
|
||||
unsigned char *p = buf;
|
||||
const unsigned char *end = buf + sizeof( buf );
|
||||
size_t id_len = strlen( id );
|
||||
const size_t id_len = strlen( id );
|
||||
unsigned char hash[MBEDTLS_MD_MAX_SIZE];
|
||||
|
||||
/* Write things to temporary buffer */
|
||||
@ -118,6 +118,62 @@ cleanup:
|
||||
return( ret );
|
||||
}
|
||||
|
||||
/*
|
||||
* Generate ZKP (7.4.2.3.2) and write it as ECSchnorrZKP (7.4.2.2.2)
|
||||
*/
|
||||
static int ecjpake_write_zkp( const mbedtls_md_info_t *md_info,
|
||||
const mbedtls_ecp_group *grp,
|
||||
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( (mbedtls_ecp_group *) grp,
|
||||
&v, &V, f_rng, p_rng ) ); /* TODO: wrong base point! */
|
||||
MBEDTLS_MPI_CHK( ecjpake_hash( md_info, grp, 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,
|
||||
MBEDTLS_ECP_PF_UNCOMPRESSED, &len, *p, end - *p ) );
|
||||
*p += len;
|
||||
|
||||
len = mbedtls_mpi_size( &h ); /* actually r */
|
||||
if( end < *p || (size_t)( end - *p ) < 1 + len || len > 255 )
|
||||
return( MBEDTLS_ERR_ECP_BUFFER_TOO_SMALL );
|
||||
|
||||
*(*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 );
|
||||
}
|
||||
|
||||
#if defined(MBEDTLS_SELF_TEST)
|
||||
|
||||
#if defined(MBEDTLS_PLATFORM_C)
|
||||
@ -169,6 +225,25 @@ static const unsigned char ecjpake_test_h[] = {
|
||||
0x51, 0x69, 0xfe, 0xa7, 0xa3, 0xf7, 0x79, 0x10
|
||||
};
|
||||
|
||||
/* 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 );
|
||||
}
|
||||
|
||||
/*
|
||||
* Checkup routine
|
||||
*/
|
||||
@ -177,8 +252,10 @@ int mbedtls_ecjpake_self_test( int verbose )
|
||||
int ret;
|
||||
mbedtls_ecp_group grp;
|
||||
mbedtls_ecp_point G, V, X;
|
||||
mbedtls_mpi h, h_ref;
|
||||
mbedtls_mpi x, h, h_ref;
|
||||
const mbedtls_md_info_t *md_info;
|
||||
unsigned char buf[1000];
|
||||
unsigned char *p;
|
||||
|
||||
mbedtls_ecp_group_init( &grp );
|
||||
mbedtls_ecp_point_init( &G );
|
||||
@ -186,12 +263,15 @@ int mbedtls_ecjpake_self_test( int verbose )
|
||||
mbedtls_ecp_point_init( &X );
|
||||
mbedtls_mpi_init( &h_ref );
|
||||
mbedtls_mpi_init( &h );
|
||||
mbedtls_mpi_init( &x );
|
||||
|
||||
/* Common to all tests */
|
||||
md_info = mbedtls_md_info_from_type( MBEDTLS_MD_SHA256 );
|
||||
MBEDTLS_MPI_CHK( mbedtls_ecp_group_load( &grp, MBEDTLS_ECP_DP_SECP256R1 ) );
|
||||
|
||||
if( verbose != 0 )
|
||||
mbedtls_printf( " ECJPAKE test #1 (hash): " );
|
||||
|
||||
md_info = mbedtls_md_info_from_type( MBEDTLS_MD_SHA256 );
|
||||
MBEDTLS_MPI_CHK( mbedtls_ecp_group_load( &grp, MBEDTLS_ECP_DP_SECP256R1 ) );
|
||||
MBEDTLS_MPI_CHK( mbedtls_ecp_point_read_binary( &grp, &G, ecjpake_test_G,
|
||||
sizeof( ecjpake_test_G ) ) );
|
||||
MBEDTLS_MPI_CHK( mbedtls_ecp_point_read_binary( &grp, &V, ecjpake_test_V,
|
||||
@ -212,6 +292,20 @@ int mbedtls_ecjpake_self_test( int verbose )
|
||||
if( verbose != 0 )
|
||||
mbedtls_printf( "passed\n" );
|
||||
|
||||
if( verbose != 0 )
|
||||
mbedtls_printf( " ECJPAKE test #2 (zkp, WIP): " );
|
||||
|
||||
MBEDTLS_MPI_CHK( mbedtls_ecp_gen_keypair( &grp, &x, &X,
|
||||
ecjpake_lgc, NULL ) );
|
||||
|
||||
p = buf;
|
||||
MBEDTLS_MPI_CHK( ecjpake_write_zkp( md_info, &grp, &G, &x, &X, "client",
|
||||
&p, buf + sizeof( buf ),
|
||||
ecjpake_lgc, NULL ) );
|
||||
|
||||
if( verbose != 0 )
|
||||
mbedtls_printf( "passed\n" );
|
||||
|
||||
cleanup:
|
||||
mbedtls_ecp_group_free( &grp );
|
||||
mbedtls_ecp_point_free( &G );
|
||||
@ -219,6 +313,7 @@ cleanup:
|
||||
mbedtls_ecp_point_free( &X );
|
||||
mbedtls_mpi_free( &h_ref );
|
||||
mbedtls_mpi_free( &h );
|
||||
mbedtls_mpi_free( &x );
|
||||
|
||||
if( ret != 0 )
|
||||
{
|
||||
|
||||
Loading…
Reference in New Issue
Block a user