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New function mbedtls_dhm_get_value to copy a field of a DHM context

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Reduce the need to break the DHM abstraction by accessing the context directly.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This commit is contained in:
Gilles Peskine
2021-05-27 22:50:53 +02:00
parent 487bbf6805
commit 71acc6e8d9
5 changed files with 99 additions and 4 deletions
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31
library/dhm.c
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@ -134,6 +134,37 @@ size_t mbedtls_dhm_get_len( const mbedtls_dhm_context *ctx )
return( mbedtls_mpi_size( &ctx->P ) );
}
int mbedtls_dhm_get_value( mbedtls_mpi *dest,
const mbedtls_dhm_context *ctx,
mbedtls_dhm_parameter param )
{
const mbedtls_mpi *src = NULL;
switch( param )
{
case MBEDTLS_DHM_PARAM_P:
src = &ctx->P;
break;
case MBEDTLS_DHM_PARAM_G:
src = &ctx->G;
break;
case MBEDTLS_DHM_PARAM_X:
src = &ctx->X;
break;
case MBEDTLS_DHM_PARAM_GX:
src = &ctx->GX;
break;
case MBEDTLS_DHM_PARAM_GY:
src = &ctx->GY;
break;
case MBEDTLS_DHM_PARAM_K:
src = &ctx->K;
break;
default:
return( MBEDTLS_ERR_DHM_BAD_INPUT_DATA );
}
return( mbedtls_mpi_copy( dest, src ) );
}
/*
* Parse the ServerKeyExchange parameters
*/