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Add ecdh_calc_secret()

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This commit is contained in:
Manuel Pégourié-Gonnard
2013-02-11 22:05:42 +01:00
parent 5cceb41d2c
commit 424fda5d7b
3 changed files with 35 additions and 1 deletions
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17
library/ecdh.c
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@ -186,6 +186,23 @@ int ecdh_read_public( ecdh_context *ctx,
return ecp_tls_read_point( &ctx->grp, &ctx->Qp, &buf, blen );
}
/*
* Derive and export the shared secret
*/
int ecdh_calc_secret( ecdh_context *ctx, size_t *olen,
unsigned char *buf, size_t blen )
{
int ret;
if( ( ret = ecdh_compute_shared( &ctx->grp, &ctx->z, &ctx->Qp, &ctx->d ) )
!= 0 )
return( ret );
*olen = mpi_size( &ctx->z );
return mpi_write_binary( &ctx->z, buf, blen );
}
#if defined(POLARSSL_SELF_TEST)
/*