ec_internal_curves.c File Reference

#include "precomp.h"

Include dependency graph for ec_internal_curves.c:

Go to the source code of this file.

Functions
static PCSYMCRYPT_ECURVE_PARAMS SYMCRYPT_CALL	SymCryptGetCachedEcurveParams (SYMCRYPT_CACHED_ECURVE_ID curveId)
PCSYMCRYPT_ECURVE SYMCRYPT_CALL	SymCryptGetCachedEcurve (SYMCRYPT_CACHED_ECURVE_ID curveId)

Variables
static PCSYMCRYPT_ECURVE	rgpCachedCurves [SYMCRYPT_CACHED_ECURVE_ID_COUNT] = { 0 }

Function Documentation

SymCryptGetCachedEcurve()

PCSYMCRYPT_ECURVE SYMCRYPT_CALL SymCryptGetCachedEcurve

(

SYMCRYPT_CACHED_ECURVE_ID

curveId

)

Definition at line 33 of file ec_internal_curves.c.

{
    PCSYMCRYPT_ECURVE pCachedCurve = NULL;
    PSYMCRYPT_ECURVE pNewCurve = NULL;
    PSYMCRYPT_ECURVE pCurrCurve = NULL;
    PCSYMCRYPT_ECURVE_PARAMS pParams = NULL;
 
    if ( curveId < 0 || curveId >= SYMCRYPT_CACHED_ECURVE_ID_COUNT )
    {
        return NULL;
    }
 
    pCachedCurve = (PCSYMCRYPT_ECURVE) SYMCRYPT_ATOMIC_LOADPTR_ACQUIRE( &rgpCachedCurves[curveId] );
    if ( pCachedCurve != NULL )
    {
        return pCachedCurve;
    }
 
    pParams = SymCryptGetCachedEcurveParams( curveId );
    if ( pParams == NULL )
    {
        return NULL;
    }
 
    pNewCurve = SymCryptEcurveAllocate( pParams, 0 );
    if ( pNewCurve == NULL )
    {
        return NULL;
    }
 
    pCurrCurve = SYMCRYPT_ATOMIC_CAS_PTR_ACQUIRE_RELEASE(
                    &rgpCachedCurves[curveId],
                    pNewCurve,
                    NULL);
 
    // Means the original curve was already filled
    // and that our new curve was not used. So we
    // free the new curve and return the existing one.
    if ( pCurrCurve != NULL )
    {
        SymCryptEcurveFree( pNewCurve );
        return pCurrCurve;
    }
 
    return pNewCurve;
}

SymCryptGetCachedEcurveParams()

static PCSYMCRYPT_ECURVE_PARAMS SYMCRYPT_CALL SymCryptGetCachedEcurveParams ( SYMCRYPT_CACHED_ECURVE_ID  curveId )

static

Definition at line 15 of file ec_internal_curves.c.

{
    switch (curveId)
    {
        case SYMCRYPT_CACHED_ECURVE_ID_NIST_P256:
            return SymCryptEcurveParamsNistP256;
        case SYMCRYPT_CACHED_ECURVE_ID_NIST_P384:
            return SymCryptEcurveParamsNistP384;
        case SYMCRYPT_CACHED_ECURVE_ID_CURVE_25519:
            return SymCryptEcurveParamsCurve25519;
        default:
            return NULL;
    }
}

Referenced by SymCryptGetCachedEcurve().

Variable Documentation

rgpCachedCurves

PCSYMCRYPT_ECURVE rgpCachedCurves[SYMCRYPT_CACHED_ECURVE_ID_COUNT] = { 0 }

static

Definition at line 10 of file ec_internal_curves.c.

Referenced by SymCryptGetCachedEcurve().