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Add ecdh_read_params().

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This commit is contained in:
Manuel Pégourié-Gonnard 2013-02-11 20:28:55 +01:00
parent 13724765b2
commit 854fbd7ba2
4 changed files with 73 additions and 9 deletions
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20
include/polarssl/ecdh.h
View file

@ -105,10 +105,22 @@ void ecdh_free( ecdh_context *ctx );
*
* \return 0 if successful, or an POLARSSL_ERR_ECP_XXX error code
*/
int ecdh_make_server_params( ecdh_context *ctx, size_t *olen,
unsigned char *buf, size_t blen,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng );
int ecdh_make_params( ecdh_context *ctx, size_t *olen,
unsigned char *buf, size_t blen,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng );
/**
* \brief Parse the ServerKeyExhange parameters
*
* \param ctx ECDH context
* \param buf $(start of input buffer)
* \param end one past end of buffer
*
* \return 0 if successful, or an POLARSSL_ERR_ECP_XXX error code
*/
int ecdh_read_params( ecdh_context *ctx,
const unsigned char **buf, const unsigned char *end );
/**
* \brief Checkup routine

31
library/ecdh.c
View file

@ -104,16 +104,16 @@ void ecdh_free( ecdh_context *ctx )
}
/*
* Setup and write the ServerKeyExhange parameters
* Setup and write the ServerKeyExhange parameters (RFC 4492)
* struct {
* ECParameters curve_params;
* ECPoint public;
* } ServerECDHParams;
*/
int ecdh_make_server_params( ecdh_context *ctx, size_t *olen,
unsigned char *buf, size_t blen,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng )
int ecdh_make_params( ecdh_context *ctx, size_t *olen,
unsigned char *buf, size_t blen,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng )
{
int ret;
size_t grp_len, pt_len;
@ -137,6 +137,27 @@ int ecdh_make_server_params( ecdh_context *ctx, size_t *olen,
return 0;
}
/*
* Read the ServerKeyExhange parameters (RFC 4492)
* struct {
* ECParameters curve_params;
* ECPoint public;
* } ServerECDHParams;
*/
int ecdh_read_params( ecdh_context *ctx,
const unsigned char **buf, const unsigned char *end )
{
int ret;
if( ( ret = ecp_tls_read_group( &ctx->grp, buf, end - *buf ) ) != 0 )
return( ret );
if( ( ret = ecp_tls_read_point( &ctx->grp, &ctx->Qp, buf, end - *buf ) )
!= 0 )
return( ret );
return 0;
}
#if defined(POLARSSL_SELF_TEST)

6
tests/suites/test_suite_ecdh.data
View file

@ -21,3 +21,9 @@ ecdh_primitive_testvec:SECP384R1:099F3C7034D4A2C699884D73A375A67F7624EF7C6B3C0F1
ECDH primitive rfc 5903 p521
ecdh_primitive_testvec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
ECDH exchange #1
ecdh_exchange:SECP192R1
ECDH exchange #2
ecdh_exchange:SECP521R1

25
tests/suites/test_suite_ecdh.function
View file

@ -78,3 +78,28 @@ ecdh_primitive_testvec:id:dA:xA:yA:dB:xB:yB:z
mpi_free( &zA ); mpi_free( &zB ); mpi_free( &check );
}
END_CASE
BEGIN_CASE
ecdh_exchange:id
{
ecdh_context srv, cli;
unsigned char buf[1000];
const unsigned char *vbuf;
size_t len;
rnd_pseudo_info rnd_info;
ecdh_init( &srv );
ecdh_init( &cli );
memset( &rnd_info, 0x00, sizeof( rnd_pseudo_info ) );
TEST_ASSERT( ecp_use_known_dp( &srv.grp, POLARSSL_ECP_DP_{id} ) == 0 );
memset( buf, 0x00, sizeof( buf ) ); vbuf = buf;
TEST_ASSERT( ecdh_make_params( &srv, &len, buf, 1000,
&rnd_pseudo_rand, &rnd_info ) == 0 );
TEST_ASSERT( ecdh_read_params( &cli, &vbuf, buf + len ) == 0 );
ecdh_free( &srv );
ecdh_free( &cli );
}
END_CASE