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Rename variable to prepare for cli/srv unification

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This commit is contained in:
Manuel Pégourié-Gonnard 2015-08-14 11:54:35 +02:00
parent 6b798b9dae
commit ce4567614b
2 changed files with 67 additions and 55 deletions
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24
include/mbedtls/ecjpake.h
View File

@ -47,7 +47,15 @@ typedef enum {
} mbedtls_ecjpake_role;
/**
* EC J-PAKE context structure
* EC J-PAKE context structure.
*
* J-PAKE is a symmetric protocol, except for the identifiers used in
* Zero-Knowledge Proofs, and the serialization of the second message
* (KeyExchange) as defined by the Thread spec.
*
* In order to benefit from this symmetry, we choose a different naming
* convetion from the Thread v1.0 spec. Correspondance is indicated in the
* description as a pair C: <client name>, S: <server name>
*/
typedef struct
{
@ -55,14 +63,14 @@ typedef struct
mbedtls_ecp_group grp; /**< Elliptic curve */
mbedtls_ecjpake_role role; /**< Are we client or server? */
mbedtls_ecp_point X1; /**< Public key one */
mbedtls_ecp_point X2; /**< Public key two */
mbedtls_ecp_point X3; /**< Public key three */
mbedtls_ecp_point X4; /**< Public key four */
mbedtls_ecp_point Xp; /**< Peer's public key (Xs or Xc) */
mbedtls_ecp_point Xm1; /**< My public key 1 C: X1, S: X3 */
mbedtls_ecp_point Xm2; /**< My public key 2 C: X2, S: X4 */
mbedtls_ecp_point Xp1; /**< Peer public key 1 C: X3, S: X1 */
mbedtls_ecp_point Xp2; /**< Peer public key 2 C: X4, S: X2 */
mbedtls_ecp_point Xp; /**< Peer public key C: Xs, S: Xc */
mbedtls_mpi xa; /**< Our first secret (x1 or x3) */
mbedtls_mpi xb; /**< Our second secret (x2 or x4) */
mbedtls_mpi xm1; /**< My private key 1 C: x1, S: x3 */
mbedtls_mpi xm2; /**< My private key 2 C: x2, S: x4 */
mbedtls_mpi s; /**< Pre-shared secret (passphrase) */
} mbedtls_ecjpake_context;

98
library/ecjpake.c
View File

@ -58,15 +58,15 @@ void mbedtls_ecjpake_init( mbedtls_ecjpake_context *ctx )
ctx->md_info = NULL;
mbedtls_ecp_group_init( &ctx->grp );
mbedtls_ecp_point_init( &ctx->X1 );
mbedtls_ecp_point_init( &ctx->X2 );
mbedtls_ecp_point_init( &ctx->X3 );
mbedtls_ecp_point_init( &ctx->X4 );
mbedtls_ecp_point_init( &ctx->Xp );
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->xa );
mbedtls_mpi_init( &ctx->xb );
mbedtls_mpi_init( &ctx->s );
mbedtls_mpi_init( &ctx->xm1 );
mbedtls_mpi_init( &ctx->xm2 );
mbedtls_mpi_init( &ctx->s );
}
/*
@ -80,15 +80,15 @@ void mbedtls_ecjpake_free( mbedtls_ecjpake_context *ctx )
ctx->md_info = NULL;
mbedtls_ecp_group_free( &ctx->grp );
mbedtls_ecp_point_free( &ctx->X1 );
mbedtls_ecp_point_free( &ctx->X2 );
mbedtls_ecp_point_free( &ctx->X3 );
mbedtls_ecp_point_free( &ctx->X4 );
mbedtls_ecp_point_free( &ctx->Xp );
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->xa );
mbedtls_mpi_free( &ctx->xb );
mbedtls_mpi_free( &ctx->s );
mbedtls_mpi_free( &ctx->xm1 );
mbedtls_mpi_free( &ctx->xm2 );
mbedtls_mpi_free( &ctx->s );
}
/*
@ -437,9 +437,9 @@ cleanup:
static int ecjpake_kkpp_write( const mbedtls_md_info_t *md_info,
const mbedtls_ecp_group *grp,
const mbedtls_ecp_point *G,
mbedtls_mpi *xa,
mbedtls_mpi *xm1,
mbedtls_ecp_point *Xa,
mbedtls_mpi *xb,
mbedtls_mpi *xm2,
mbedtls_ecp_point *Xb,
const char *id,
unsigned char *buf,
@ -452,9 +452,9 @@ static int ecjpake_kkpp_write( const mbedtls_md_info_t *md_info,
unsigned char *p = buf;
const unsigned char *end = buf + len;
MBEDTLS_MPI_CHK( ecjpake_kkp_write( md_info, grp, G, xa, Xa, id,
MBEDTLS_MPI_CHK( ecjpake_kkp_write( md_info, grp, G, xm1, Xa, id,
&p, end, f_rng, p_rng ) );
MBEDTLS_MPI_CHK( ecjpake_kkp_write( md_info, grp, G, xb, Xb, id,
MBEDTLS_MPI_CHK( ecjpake_kkp_write( md_info, grp, G, xm2, Xb, id,
&p, end, f_rng, p_rng ) );
*olen = p - buf;
@ -471,7 +471,7 @@ int mbedtls_ecjpake_tls_read_client_ext( mbedtls_ecjpake_context *ctx,
size_t len )
{
return( ecjpake_kkpp_read( ctx->md_info, &ctx->grp, &ctx->grp.G,
&ctx->X1, &ctx->X2, ID_PEER,
&ctx->Xp1, &ctx->Xp2, ID_PEER,
buf, len ) );
}
@ -483,7 +483,7 @@ int mbedtls_ecjpake_tls_read_server_ext( mbedtls_ecjpake_context *ctx,
size_t len )
{
return( ecjpake_kkpp_read( ctx->md_info, &ctx->grp, &ctx->grp.G,
&ctx->X3, &ctx->X4, ID_PEER,
&ctx->Xp1, &ctx->Xp2, ID_PEER,
buf, len ) );
}
@ -496,7 +496,7 @@ int mbedtls_ecjpake_tls_write_client_ext( mbedtls_ecjpake_context *ctx,
void *p_rng )
{
return( ecjpake_kkpp_write( ctx->md_info, &ctx->grp, &ctx->grp.G,
&ctx->xa, &ctx->X1, &ctx->xb, &ctx->X2,
&ctx->xm1, &ctx->Xm1, &ctx->xm2, &ctx->Xm2,
ID_MINE, buf, len, olen, f_rng, p_rng ) );
}
@ -509,7 +509,7 @@ int mbedtls_ecjpake_tls_write_server_ext( mbedtls_ecjpake_context *ctx,
void *p_rng )
{
return( ecjpake_kkpp_write( ctx->md_info, &ctx->grp, &ctx->grp.G,
&ctx->xa, &ctx->X3, &ctx->xb, &ctx->X4,
&ctx->xm1, &ctx->Xm1, &ctx->xm2, &ctx->Xm2,
ID_MINE, buf, len, olen, f_rng, p_rng ) );
}
@ -553,11 +553,12 @@ int mbedtls_ecjpake_tls_read_server_params( mbedtls_ecjpake_context *ctx,
mbedtls_ecp_point_init( &GB );
/*
* GB = X1 + X2 + X3 (7.4.2.5.1)
* We need that before parsing in order to check Xs as we read it
* Client: GB = X1 + X2 + X3 (7.4.2.5.1)
* Unified: GB = 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, &GB,
&ctx->X1, &ctx->X2, &ctx->X3 ) );
&ctx->Xm1, &ctx->Xm2, &ctx->Xp1 ) );
/*
* struct {
@ -616,13 +617,14 @@ int mbedtls_ecjpake_tls_write_server_params( mbedtls_ecjpake_context *ctx,
/*
* First generate private/public key pair (7.4.2.5.1)
*
* GB = X1 + X2 + X3
* Server: GB = X1 + X2 + X3
* Unified:
* xs = x4 * s mod n
* Xs = xs * GB
*/
MBEDTLS_MPI_CHK( ecjpake_ecp_add3( &ctx->grp, &GB,
&ctx->X1, &ctx->X2, &ctx->X3 ) );
MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( &xs, &ctx->xb, &ctx->s ) );
&ctx->Xp1, &ctx->Xp2, &ctx->Xm1 ) );
MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( &xs, &ctx->xm2, &ctx->s ) );
MBEDTLS_MPI_CHK( mbedtls_mpi_mod_mpi( &xs, &xs, &ctx->grp.N ) );
MBEDTLS_MPI_CHK( mbedtls_ecp_mul( &ctx->grp, &Xs, &xs, &GB, f_rng, p_rng ) );
@ -673,11 +675,12 @@ int mbedtls_ecjpake_tls_read_client_params( mbedtls_ecjpake_context *ctx,
mbedtls_ecp_point_init( &GA );
/*
* GA = X1 + X3 + X4 (7.4.2.6.1)
* Server: GA = X1 + X3 + X4 (7.4.2.6.1)
* Unified: G = Xp1 + Xm1 + Xm2
* We need that before parsing in order to check Xc as we read it
*/
MBEDTLS_MPI_CHK( ecjpake_ecp_add3( &ctx->grp, &GA,
&ctx->X1, &ctx->X3, &ctx->X4 ) );
&ctx->Xp1, &ctx->Xm1, &ctx->Xm2 ) );
/*
* struct {
@ -725,13 +728,14 @@ int mbedtls_ecjpake_tls_write_client_params( mbedtls_ecjpake_context *ctx,
/*
* First generate private/public key pair (7.4.2.6.1)
*
* GA = X1 + X3 + X4
* Client: GA = X1 + X3 + X4
* Unified: G = Xm1 + Xp1 + Xp2
* xc = x2 * s mod n
* Xc = xc * GA
*/
MBEDTLS_MPI_CHK( ecjpake_ecp_add3( &ctx->grp, &GA,
&ctx->X1, &ctx->X3, &ctx->X4 ) );
MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( &xc, &ctx->xb, &ctx->s ) );
&ctx->Xm1, &ctx->Xp1, &ctx->Xp2 ) );
MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( &xc, &ctx->xm2, &ctx->s ) );
MBEDTLS_MPI_CHK( mbedtls_mpi_mod_mpi( &xc, &xc, &ctx->grp.N ) );
MBEDTLS_MPI_CHK( mbedtls_ecp_mul( &ctx->grp, &Xc, &xc, &GA, f_rng, p_rng ) );
@ -779,21 +783,21 @@ int mbedtls_ecjpake_tls_derive_pms( mbedtls_ecjpake_context *ctx,
mbedtls_mpi_init( &one );
MBEDTLS_MPI_CHK( mbedtls_mpi_lset( &one, 1 ) );
X42 = ctx->role == MBEDTLS_ECJPAKE_CLIENT ? &ctx->X4 : &ctx->X2;
X42 = ctx->role == MBEDTLS_ECJPAKE_CLIENT ? &ctx->Xp2 : &ctx->Xp2;
/*
* Client: K = ( Xs - X4 * x2 * s ) * x2
* Server: K = ( Xc - X2 * x4 * s ) * x4
* Unified: K = ( Xp - X42 * xb * x ) * xb
* Unified: K = ( Xp - X42 * xm2 * x ) * xm2
*/
MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( &xbs, &ctx->xb, &ctx->s ) );
MBEDTLS_MPI_CHK( mbedtls_mpi_mul_mpi( &xbs, &ctx->xm2, &ctx->s ) );
xbs.s *= -1;
MBEDTLS_MPI_CHK( mbedtls_mpi_mod_mpi( &xbs, &xbs, &ctx->grp.N ) );
MBEDTLS_MPI_CHK( mbedtls_ecp_muladd( &ctx->grp, &K,
&one, &ctx->Xp,
&xbs, X42 ) );
MBEDTLS_MPI_CHK( mbedtls_ecp_mul( &ctx->grp, &K, &ctx->xb, &K,
MBEDTLS_MPI_CHK( mbedtls_ecp_mul( &ctx->grp, &K, &ctx->xm2, &K,
f_rng, p_rng ) );
/* PMS = SHA-256( K.X ) */
@ -1061,13 +1065,13 @@ int mbedtls_ecjpake_self_test( int verbose )
mbedtls_printf( " ECJPAKE test #2 (reference handshake): " );
/* Simulate key generation on client, skip writing client_ext */
MBEDTLS_MPI_CHK( mbedtls_mpi_read_binary( &cli.xa,
MBEDTLS_MPI_CHK( mbedtls_mpi_read_binary( &cli.xm1,
ecjpake_test_x1, sizeof( ecjpake_test_x1 ) ) );
MBEDTLS_MPI_CHK( mbedtls_mpi_read_binary( &cli.xb,
MBEDTLS_MPI_CHK( mbedtls_mpi_read_binary( &cli.xm2,
ecjpake_test_x2, sizeof( ecjpake_test_x2 ) ) );
MBEDTLS_MPI_CHK( mbedtls_ecp_mul( &cli.grp, &cli.X1, &cli.xa,
MBEDTLS_MPI_CHK( mbedtls_ecp_mul( &cli.grp, &cli.Xm1, &cli.xm1,
&cli.grp.G, NULL, NULL ) );
MBEDTLS_MPI_CHK( mbedtls_ecp_mul( &cli.grp, &cli.X2, &cli.xb,
MBEDTLS_MPI_CHK( mbedtls_ecp_mul( &cli.grp, &cli.Xm2, &cli.xm2,
&cli.grp.G, NULL, NULL ) );
/* Server reads client ext */
@ -1076,13 +1080,13 @@ int mbedtls_ecjpake_self_test( int verbose )
sizeof( ecjpake_test_cli_ext ) ) == 0 );
/* Simulate key generation on server, skip writing server_ext */
MBEDTLS_MPI_CHK( mbedtls_mpi_read_binary( &srv.xa,
MBEDTLS_MPI_CHK( mbedtls_mpi_read_binary( &srv.xm1,
ecjpake_test_x3, sizeof( ecjpake_test_x3 ) ) );
MBEDTLS_MPI_CHK( mbedtls_mpi_read_binary( &srv.xb,
MBEDTLS_MPI_CHK( mbedtls_mpi_read_binary( &srv.xm2,
ecjpake_test_x4, sizeof( ecjpake_test_x4 ) ) );
MBEDTLS_MPI_CHK( mbedtls_ecp_mul( &srv.grp, &srv.X3, &srv.xa,
MBEDTLS_MPI_CHK( mbedtls_ecp_mul( &srv.grp, &srv.Xm1, &srv.xm1,
&srv.grp.G, NULL, NULL ) );
MBEDTLS_MPI_CHK( mbedtls_ecp_mul( &srv.grp, &srv.X4, &srv.xb,
MBEDTLS_MPI_CHK( mbedtls_ecp_mul( &srv.grp, &srv.Xm2, &srv.xm2,
&srv.grp.G, NULL, NULL ) );
/* Client reads server ext and key exchange */