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Add ecdh_make_server_params (untested yet)

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This commit is contained in:
Manuel Pégourié-Gonnard 2013-02-10 15:01:54 +01:00
parent 63533e44c2
commit 13724765b2
2 changed files with 60 additions and 6 deletions
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30
include/polarssl/ecdh.h
View File

@ -34,11 +34,12 @@
*/ */
typedef struct typedef struct
{ {
ecp_group grp; /*!< ellipitic curve used */ ecp_group grp; /*!< ellipitic curve used */
mpi d; /*!< our secret value */ mpi d; /*!< our secret value */
ecp_point Q; /*!< our public value */ ecp_point Q; /*!< our public value */
ecp_point Qp; /*!< peer's public value */ ecp_point Qp; /*!< peer's public value */
mpi z; /*!< shared secret */ mpi z; /*!< shared secret */
int point_format; /*!< format for point export */
} }
ecdh_context; ecdh_context;
@ -90,6 +91,25 @@ void ecdh_init( ecdh_context *ctx );
*/ */
void ecdh_free( ecdh_context *ctx ); void ecdh_free( ecdh_context *ctx );
/**
* \brief Setup and write the ServerKeyExhange parameters
*
* \param ctx ECDH context
* \param buf destination buffer
* \param olen number of chars written
* \param f_rng RNG function
* \param p_rng RNG parameter
*
* \note This function assumes that ctx->grp has already been
* properly set (for example using ecp_use_known_dp).
*
* \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 );
/** /**
* \brief Checkup routine * \brief Checkup routine
* *

36
library/ecdh.c
View File

@ -85,9 +85,9 @@ void ecdh_init( ecdh_context *ctx )
ecp_point_init( &ctx->Q ); ecp_point_init( &ctx->Q );
ecp_point_init( &ctx->Qp ); ecp_point_init( &ctx->Qp );
mpi_init ( &ctx->z ); mpi_init ( &ctx->z );
ctx->point_format = POLARSSL_ECP_PF_UNCOMPRESSED;
} }
/* /*
* Free context * Free context
*/ */
@ -103,6 +103,40 @@ void ecdh_free( ecdh_context *ctx )
mpi_free ( &ctx->z ); mpi_free ( &ctx->z );
} }
/*
* Setup and write the ServerKeyExhange parameters
* 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 ret;
size_t grp_len, pt_len;
if( ( ret = ecdh_gen_public( &ctx->grp, &ctx->d, &ctx->Q, f_rng, p_rng ) )
!= 0 )
return( ret );
if( ( ret = ecp_tls_write_group( &ctx->grp, &grp_len, buf, blen ) )
!= 0 )
return( ret );
buf += grp_len;
blen -= grp_len;
if( ( ret = ecp_tls_write_point( &ctx->grp, &ctx->Q, ctx->point_format,
&pt_len, buf, blen ) ) != 0 )
return( ret );
*olen = grp_len + pt_len;
return 0;
}
#if defined(POLARSSL_SELF_TEST) #if defined(POLARSSL_SELF_TEST)