/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

/*
 * mechanism.c
 *
 * This file implements the NSSCKFWMechanism type and methods.
 */

#ifndef CK_T
#include "ck.h"
#endif /* CK_T */

/*
 * NSSCKFWMechanism
 *
 *  -- create/destroy --
 *  nssCKFWMechanism_Create
 *  nssCKFWMechanism_Destroy
 *
 *  -- implement public accessors --
 *  nssCKFWMechanism_GetMDMechanism
 *  nssCKFWMechanism_GetParameter
 *
 *  -- private accessors --
 *
 *  -- module fronts --
 *  nssCKFWMechanism_GetMinKeySize
 *  nssCKFWMechanism_GetMaxKeySize
 *  nssCKFWMechanism_GetInHardware
 *  nssCKFWMechanism_GetCanEncrypt
 *  nssCKFWMechanism_GetCanDecrypt
 *  nssCKFWMechanism_GetCanDigest
 *  nssCKFWMechanism_GetCanSign
 *  nssCKFWMechanism_GetCanSignRecover
 *  nssCKFWMechanism_GetCanVerify
 *  nssCKFWMechanism_GetCanGenerate
 *  nssCKFWMechanism_GetCanGenerateKeyPair
 *  nssCKFWMechanism_GetCanUnwrap
 *  nssCKFWMechanism_GetCanWrap
 *  nssCKFWMechanism_GetCanDerive
 *  nssCKFWMechanism_EncryptInit
 *  nssCKFWMechanism_DecryptInit
 *  nssCKFWMechanism_DigestInit
 *  nssCKFWMechanism_SignInit
 *  nssCKFWMechanism_VerifyInit
 *  nssCKFWMechanism_SignRecoverInit
 *  nssCKFWMechanism_VerifyRecoverInit
 *  nssCKFWMechanism_GenerateKey
 *  nssCKFWMechanism_GenerateKeyPair
 *  nssCKFWMechanism_GetWrapKeyLength
 *  nssCKFWMechanism_WrapKey
 *  nssCKFWMechanism_UnwrapKey
 *  nssCKFWMechanism_DeriveKey
 */

struct NSSCKFWMechanismStr {
    NSSCKMDMechanism *mdMechanism;
    NSSCKMDToken *mdToken;
    NSSCKFWToken *fwToken;
    NSSCKMDInstance *mdInstance;
    NSSCKFWInstance *fwInstance;
};

/*
 * nssCKFWMechanism_Create
 *
 */
NSS_IMPLEMENT NSSCKFWMechanism *
nssCKFWMechanism_Create(
    NSSCKMDMechanism *mdMechanism,
    NSSCKMDToken *mdToken,
    NSSCKFWToken *fwToken,
    NSSCKMDInstance *mdInstance,
    NSSCKFWInstance *fwInstance)
{
    NSSCKFWMechanism *fwMechanism;

    fwMechanism = nss_ZNEW(NULL, NSSCKFWMechanism);
    if (!fwMechanism) {
        return (NSSCKFWMechanism *)NULL;
    }
    fwMechanism->mdMechanism = mdMechanism;
    fwMechanism->mdToken = mdToken;
    fwMechanism->fwToken = fwToken;
    fwMechanism->mdInstance = mdInstance;
    fwMechanism->fwInstance = fwInstance;
    return fwMechanism;
}

/*
 * nssCKFWMechanism_Destroy
 *
 */
NSS_IMPLEMENT void
nssCKFWMechanism_Destroy(
    NSSCKFWMechanism *fwMechanism)
{
    /* destroy any fw resources held by nssCKFWMechanism (currently none) */

    if (fwMechanism->mdMechanism->Destroy) {
        /* destroys it's parent as well */
        fwMechanism->mdMechanism->Destroy(
            fwMechanism->mdMechanism,
            fwMechanism,
            fwMechanism->mdInstance,
            fwMechanism->fwInstance);
    }
    /* if the Destroy function wasn't supplied, then the mechanism is 'static',
     * and there is nothing to destroy */
    return;
}

/*
 * nssCKFWMechanism_GetMDMechanism
 *
 */
NSS_IMPLEMENT NSSCKMDMechanism *
nssCKFWMechanism_GetMDMechanism(
    NSSCKFWMechanism *fwMechanism)
{
    return fwMechanism->mdMechanism;
}

/*
 * nssCKFWMechanism_GetMinKeySize
 *
 */
NSS_IMPLEMENT CK_ULONG
nssCKFWMechanism_GetMinKeySize(
    NSSCKFWMechanism *fwMechanism,
    CK_RV *pError)
{
    if (!fwMechanism->mdMechanism->GetMinKeySize) {
        return 0;
    }

    return fwMechanism->mdMechanism->GetMinKeySize(fwMechanism->mdMechanism,
                                                   fwMechanism, fwMechanism->mdToken, fwMechanism->fwToken,
                                                   fwMechanism->mdInstance, fwMechanism->fwInstance, pError);
}

/*
 * nssCKFWMechanism_GetMaxKeySize
 *
 */
NSS_IMPLEMENT CK_ULONG
nssCKFWMechanism_GetMaxKeySize(
    NSSCKFWMechanism *fwMechanism,
    CK_RV *pError)
{
    if (!fwMechanism->mdMechanism->GetMaxKeySize) {
        return 0;
    }

    return fwMechanism->mdMechanism->GetMaxKeySize(fwMechanism->mdMechanism,
                                                   fwMechanism, fwMechanism->mdToken, fwMechanism->fwToken,
                                                   fwMechanism->mdInstance, fwMechanism->fwInstance, pError);
}

/*
 * nssCKFWMechanism_GetInHardware
 *
 */
NSS_IMPLEMENT CK_BBOOL
nssCKFWMechanism_GetInHardware(
    NSSCKFWMechanism *fwMechanism,
    CK_RV *pError)
{
    if (!fwMechanism->mdMechanism->GetInHardware) {
        return CK_FALSE;
    }

    return fwMechanism->mdMechanism->GetInHardware(fwMechanism->mdMechanism,
                                                   fwMechanism, fwMechanism->mdToken, fwMechanism->fwToken,
                                                   fwMechanism->mdInstance, fwMechanism->fwInstance, pError);
}

/*
 * the following are determined automatically by which of the cryptographic
 * functions are defined for this mechanism.
 */
/*
 * nssCKFWMechanism_GetCanEncrypt
 *
 */
NSS_EXTERN CK_BBOOL
nssCKFWMechanism_GetCanEncrypt(
    NSSCKFWMechanism *fwMechanism,
    CK_RV *pError)
{
    if (!fwMechanism->mdMechanism->EncryptInit) {
        return CK_FALSE;
    }
    return CK_TRUE;
}

/*
 * nssCKFWMechanism_GetCanDecrypt
 *
 */
NSS_EXTERN CK_BBOOL
nssCKFWMechanism_GetCanDecrypt(
    NSSCKFWMechanism *fwMechanism,
    CK_RV *pError)
{
    if (!fwMechanism->mdMechanism->DecryptInit) {
        return CK_FALSE;
    }
    return CK_TRUE;
}

/*
 * nssCKFWMechanism_GetCanDigest
 *
 */
NSS_EXTERN CK_BBOOL
nssCKFWMechanism_GetCanDigest(
    NSSCKFWMechanism *fwMechanism,
    CK_RV *pError)
{
    if (!fwMechanism->mdMechanism->DigestInit) {
        return CK_FALSE;
    }
    return CK_TRUE;
}

/*
 * nssCKFWMechanism_GetCanSign
 *
 */
NSS_EXTERN CK_BBOOL
nssCKFWMechanism_GetCanSign(
    NSSCKFWMechanism *fwMechanism,
    CK_RV *pError)
{
    if (!fwMechanism->mdMechanism->SignInit) {
        return CK_FALSE;
    }
    return CK_TRUE;
}

/*
 * nssCKFWMechanism_GetCanSignRecover
 *
 */
NSS_EXTERN CK_BBOOL
nssCKFWMechanism_GetCanSignRecover(
    NSSCKFWMechanism *fwMechanism,
    CK_RV *pError)
{
    if (!fwMechanism->mdMechanism->SignRecoverInit) {
        return CK_FALSE;
    }
    return CK_TRUE;
}

/*
 * nssCKFWMechanism_GetCanVerify
 *
 */
NSS_EXTERN CK_BBOOL
nssCKFWMechanism_GetCanVerify(
    NSSCKFWMechanism *fwMechanism,
    CK_RV *pError)
{
    if (!fwMechanism->mdMechanism->VerifyInit) {
        return CK_FALSE;
    }
    return CK_TRUE;
}

/*
 * nssCKFWMechanism_GetCanVerifyRecover
 *
 */
NSS_EXTERN CK_BBOOL
nssCKFWMechanism_GetCanVerifyRecover(
    NSSCKFWMechanism *fwMechanism,
    CK_RV *pError)
{
    if (!fwMechanism->mdMechanism->VerifyRecoverInit) {
        return CK_FALSE;
    }
    return CK_TRUE;
}

/*
 * nssCKFWMechanism_GetCanGenerate
 *
 */
NSS_EXTERN CK_BBOOL
nssCKFWMechanism_GetCanGenerate(
    NSSCKFWMechanism *fwMechanism,
    CK_RV *pError)
{
    if (!fwMechanism->mdMechanism->GenerateKey) {
        return CK_FALSE;
    }
    return CK_TRUE;
}

/*
 * nssCKFWMechanism_GetCanGenerateKeyPair
 *
 */
NSS_EXTERN CK_BBOOL
nssCKFWMechanism_GetCanGenerateKeyPair(
    NSSCKFWMechanism *fwMechanism,
    CK_RV *pError)
{
    if (!fwMechanism->mdMechanism->GenerateKeyPair) {
        return CK_FALSE;
    }
    return CK_TRUE;
}

/*
 * nssCKFWMechanism_GetCanUnwrap
 *
 */
NSS_EXTERN CK_BBOOL
nssCKFWMechanism_GetCanUnwrap(
    NSSCKFWMechanism *fwMechanism,
    CK_RV *pError)
{
    if (!fwMechanism->mdMechanism->UnwrapKey) {
        return CK_FALSE;
    }
    return CK_TRUE;
}

/*
 * nssCKFWMechanism_GetCanWrap
 *
 */
NSS_EXTERN CK_BBOOL
nssCKFWMechanism_GetCanWrap(
    NSSCKFWMechanism *fwMechanism,
    CK_RV *pError)
{
    if (!fwMechanism->mdMechanism->WrapKey) {
        return CK_FALSE;
    }
    return CK_TRUE;
}

/*
 * nssCKFWMechanism_GetCanDerive
 *
 */
NSS_EXTERN CK_BBOOL
nssCKFWMechanism_GetCanDerive(
    NSSCKFWMechanism *fwMechanism,
    CK_RV *pError)
{
    if (!fwMechanism->mdMechanism->DeriveKey) {
        return CK_FALSE;
    }
    return CK_TRUE;
}

/*
 * These are the actual crypto operations
 */

/*
 * nssCKFWMechanism_EncryptInit
 *  Start an encryption session.
 */
NSS_EXTERN CK_RV
nssCKFWMechanism_EncryptInit(
    NSSCKFWMechanism *fwMechanism,
    CK_MECHANISM *pMechanism,
    NSSCKFWSession *fwSession,
    NSSCKFWObject *fwObject)
{
    NSSCKFWCryptoOperation *fwOperation;
    NSSCKMDCryptoOperation *mdOperation;
    NSSCKMDSession *mdSession;
    NSSCKMDObject *mdObject;
    CK_RV error = CKR_OK;

    fwOperation = nssCKFWSession_GetCurrentCryptoOperation(fwSession,
                                                           NSSCKFWCryptoOperationState_EncryptDecrypt);
    if (fwOperation) {
        return CKR_OPERATION_ACTIVE;
    }

    if (!fwMechanism->mdMechanism->EncryptInit) {
        return CKR_FUNCTION_FAILED;
    }

    mdSession = nssCKFWSession_GetMDSession(fwSession);
    mdObject = nssCKFWObject_GetMDObject(fwObject);
    mdOperation = fwMechanism->mdMechanism->EncryptInit(
        fwMechanism->mdMechanism,
        fwMechanism,
        pMechanism,
        mdSession,
        fwSession,
        fwMechanism->mdToken,
        fwMechanism->fwToken,
        fwMechanism->mdInstance,
        fwMechanism->fwInstance,
        mdObject,
        fwObject,
        &error);
    if (!mdOperation) {
        goto loser;
    }

    fwOperation = nssCKFWCryptoOperation_Create(mdOperation,
                                                mdSession, fwSession, fwMechanism->mdToken, fwMechanism->fwToken,
                                                fwMechanism->mdInstance, fwMechanism->fwInstance,
                                                NSSCKFWCryptoOperationType_Encrypt, &error);
    if (fwOperation) {
        nssCKFWSession_SetCurrentCryptoOperation(fwSession, fwOperation,
                                                 NSSCKFWCryptoOperationState_EncryptDecrypt);
    }

loser:
    return error;
}

/*
 * nssCKFWMechanism_DecryptInit
 *  Start an encryption session.
 */
NSS_EXTERN CK_RV
nssCKFWMechanism_DecryptInit(
    NSSCKFWMechanism *fwMechanism,
    CK_MECHANISM *pMechanism,
    NSSCKFWSession *fwSession,
    NSSCKFWObject *fwObject)
{
    NSSCKFWCryptoOperation *fwOperation;
    NSSCKMDCryptoOperation *mdOperation;
    NSSCKMDSession *mdSession;
    NSSCKMDObject *mdObject;
    CK_RV error = CKR_OK;

    fwOperation = nssCKFWSession_GetCurrentCryptoOperation(fwSession,
                                                           NSSCKFWCryptoOperationState_EncryptDecrypt);
    if (fwOperation) {
        return CKR_OPERATION_ACTIVE;
    }

    if (!fwMechanism->mdMechanism->DecryptInit) {
        return CKR_FUNCTION_FAILED;
    }

    mdSession = nssCKFWSession_GetMDSession(fwSession);
    mdObject = nssCKFWObject_GetMDObject(fwObject);
    mdOperation = fwMechanism->mdMechanism->DecryptInit(
        fwMechanism->mdMechanism,
        fwMechanism,
        pMechanism,
        mdSession,
        fwSession,
        fwMechanism->mdToken,
        fwMechanism->fwToken,
        fwMechanism->mdInstance,
        fwMechanism->fwInstance,
        mdObject,
        fwObject,
        &error);
    if (!mdOperation) {
        goto loser;
    }

    fwOperation = nssCKFWCryptoOperation_Create(mdOperation,
                                                mdSession, fwSession, fwMechanism->mdToken, fwMechanism->fwToken,
                                                fwMechanism->mdInstance, fwMechanism->fwInstance,
                                                NSSCKFWCryptoOperationType_Decrypt, &error);
    if (fwOperation) {
        nssCKFWSession_SetCurrentCryptoOperation(fwSession, fwOperation,
                                                 NSSCKFWCryptoOperationState_EncryptDecrypt);
    }

loser:
    return error;
}

/*
 * nssCKFWMechanism_DigestInit
 *  Start an encryption session.
 */
NSS_EXTERN CK_RV
nssCKFWMechanism_DigestInit(
    NSSCKFWMechanism *fwMechanism,
    CK_MECHANISM *pMechanism,
    NSSCKFWSession *fwSession)
{
    NSSCKFWCryptoOperation *fwOperation;
    NSSCKMDCryptoOperation *mdOperation;
    NSSCKMDSession *mdSession;
    CK_RV error = CKR_OK;

    fwOperation = nssCKFWSession_GetCurrentCryptoOperation(fwSession,
                                                           NSSCKFWCryptoOperationState_Digest);
    if (fwOperation) {
        return CKR_OPERATION_ACTIVE;
    }

    if (!fwMechanism->mdMechanism->DigestInit) {
        return CKR_FUNCTION_FAILED;
    }

    mdSession = nssCKFWSession_GetMDSession(fwSession);
    mdOperation = fwMechanism->mdMechanism->DigestInit(
        fwMechanism->mdMechanism,
        fwMechanism,
        pMechanism,
        mdSession,
        fwSession,
        fwMechanism->mdToken,
        fwMechanism->fwToken,
        fwMechanism->mdInstance,
        fwMechanism->fwInstance,
        &error);
    if (!mdOperation) {
        goto loser;
    }

    fwOperation = nssCKFWCryptoOperation_Create(mdOperation,
                                                mdSession, fwSession, fwMechanism->mdToken, fwMechanism->fwToken,
                                                fwMechanism->mdInstance, fwMechanism->fwInstance,
                                                NSSCKFWCryptoOperationType_Digest, &error);
    if (fwOperation) {
        nssCKFWSession_SetCurrentCryptoOperation(fwSession, fwOperation,
                                                 NSSCKFWCryptoOperationState_Digest);
    }

loser:
    return error;
}

/*
 * nssCKFWMechanism_SignInit
 *  Start an encryption session.
 */
NSS_EXTERN CK_RV
nssCKFWMechanism_SignInit(
    NSSCKFWMechanism *fwMechanism,
    CK_MECHANISM *pMechanism,
    NSSCKFWSession *fwSession,
    NSSCKFWObject *fwObject)
{
    NSSCKFWCryptoOperation *fwOperation;
    NSSCKMDCryptoOperation *mdOperation;
    NSSCKMDSession *mdSession;
    NSSCKMDObject *mdObject;
    CK_RV error = CKR_OK;

    fwOperation = nssCKFWSession_GetCurrentCryptoOperation(fwSession,
                                                           NSSCKFWCryptoOperationState_SignVerify);
    if (fwOperation) {
        return CKR_OPERATION_ACTIVE;
    }

    if (!fwMechanism->mdMechanism->SignInit) {
        return CKR_FUNCTION_FAILED;
    }

    mdSession = nssCKFWSession_GetMDSession(fwSession);
    mdObject = nssCKFWObject_GetMDObject(fwObject);
    mdOperation = fwMechanism->mdMechanism->SignInit(
        fwMechanism->mdMechanism,
        fwMechanism,
        pMechanism,
        mdSession,
        fwSession,
        fwMechanism->mdToken,
        fwMechanism->fwToken,
        fwMechanism->mdInstance,
        fwMechanism->fwInstance,
        mdObject,
        fwObject,
        &error);
    if (!mdOperation) {
        goto loser;
    }

    fwOperation = nssCKFWCryptoOperation_Create(mdOperation,
                                                mdSession, fwSession, fwMechanism->mdToken, fwMechanism->fwToken,
                                                fwMechanism->mdInstance, fwMechanism->fwInstance,
                                                NSSCKFWCryptoOperationType_Sign, &error);
    if (fwOperation) {
        nssCKFWSession_SetCurrentCryptoOperation(fwSession, fwOperation,
                                                 NSSCKFWCryptoOperationState_SignVerify);
    }

loser:
    return error;
}

/*
 * nssCKFWMechanism_VerifyInit
 *  Start an encryption session.
 */
NSS_EXTERN CK_RV
nssCKFWMechanism_VerifyInit(
    NSSCKFWMechanism *fwMechanism,
    CK_MECHANISM *pMechanism,
    NSSCKFWSession *fwSession,
    NSSCKFWObject *fwObject)
{
    NSSCKFWCryptoOperation *fwOperation;
    NSSCKMDCryptoOperation *mdOperation;
    NSSCKMDSession *mdSession;
    NSSCKMDObject *mdObject;
    CK_RV error = CKR_OK;

    fwOperation = nssCKFWSession_GetCurrentCryptoOperation(fwSession,
                                                           NSSCKFWCryptoOperationState_SignVerify);
    if (fwOperation) {
        return CKR_OPERATION_ACTIVE;
    }

    if (!fwMechanism->mdMechanism->VerifyInit) {
        return CKR_FUNCTION_FAILED;
    }

    mdSession = nssCKFWSession_GetMDSession(fwSession);
    mdObject = nssCKFWObject_GetMDObject(fwObject);
    mdOperation = fwMechanism->mdMechanism->VerifyInit(
        fwMechanism->mdMechanism,
        fwMechanism,
        pMechanism,
        mdSession,
        fwSession,
        fwMechanism->mdToken,
        fwMechanism->fwToken,
        fwMechanism->mdInstance,
        fwMechanism->fwInstance,
        mdObject,
        fwObject,
        &error);
    if (!mdOperation) {
        goto loser;
    }

    fwOperation = nssCKFWCryptoOperation_Create(mdOperation,
                                                mdSession, fwSession, fwMechanism->mdToken, fwMechanism->fwToken,
                                                fwMechanism->mdInstance, fwMechanism->fwInstance,
                                                NSSCKFWCryptoOperationType_Verify, &error);
    if (fwOperation) {
        nssCKFWSession_SetCurrentCryptoOperation(fwSession, fwOperation,
                                                 NSSCKFWCryptoOperationState_SignVerify);
    }

loser:
    return error;
}

/*
 * nssCKFWMechanism_SignRecoverInit
 *  Start an encryption session.
 */
NSS_EXTERN CK_RV
nssCKFWMechanism_SignRecoverInit(
    NSSCKFWMechanism *fwMechanism,
    CK_MECHANISM *pMechanism,
    NSSCKFWSession *fwSession,
    NSSCKFWObject *fwObject)
{
    NSSCKFWCryptoOperation *fwOperation;
    NSSCKMDCryptoOperation *mdOperation;
    NSSCKMDSession *mdSession;
    NSSCKMDObject *mdObject;
    CK_RV error = CKR_OK;

    fwOperation = nssCKFWSession_GetCurrentCryptoOperation(fwSession,
                                                           NSSCKFWCryptoOperationState_SignVerify);
    if (fwOperation) {
        return CKR_OPERATION_ACTIVE;
    }

    if (!fwMechanism->mdMechanism->SignRecoverInit) {
        return CKR_FUNCTION_FAILED;
    }

    mdSession = nssCKFWSession_GetMDSession(fwSession);
    mdObject = nssCKFWObject_GetMDObject(fwObject);
    mdOperation = fwMechanism->mdMechanism->SignRecoverInit(
        fwMechanism->mdMechanism,
        fwMechanism,
        pMechanism,
        mdSession,
        fwSession,
        fwMechanism->mdToken,
        fwMechanism->fwToken,
        fwMechanism->mdInstance,
        fwMechanism->fwInstance,
        mdObject,
        fwObject,
        &error);
    if (!mdOperation) {
        goto loser;
    }

    fwOperation = nssCKFWCryptoOperation_Create(mdOperation,
                                                mdSession, fwSession, fwMechanism->mdToken, fwMechanism->fwToken,
                                                fwMechanism->mdInstance, fwMechanism->fwInstance,
                                                NSSCKFWCryptoOperationType_SignRecover, &error);
    if (fwOperation) {
        nssCKFWSession_SetCurrentCryptoOperation(fwSession, fwOperation,
                                                 NSSCKFWCryptoOperationState_SignVerify);
    }

loser:
    return error;
}

/*
 * nssCKFWMechanism_VerifyRecoverInit
 *  Start an encryption session.
 */
NSS_EXTERN CK_RV
nssCKFWMechanism_VerifyRecoverInit(
    NSSCKFWMechanism *fwMechanism,
    CK_MECHANISM *pMechanism,
    NSSCKFWSession *fwSession,
    NSSCKFWObject *fwObject)
{
    NSSCKFWCryptoOperation *fwOperation;
    NSSCKMDCryptoOperation *mdOperation;
    NSSCKMDSession *mdSession;
    NSSCKMDObject *mdObject;
    CK_RV error = CKR_OK;

    fwOperation = nssCKFWSession_GetCurrentCryptoOperation(fwSession,
                                                           NSSCKFWCryptoOperationState_SignVerify);
    if (fwOperation) {
        return CKR_OPERATION_ACTIVE;
    }

    if (!fwMechanism->mdMechanism->VerifyRecoverInit) {
        return CKR_FUNCTION_FAILED;
    }

    mdSession = nssCKFWSession_GetMDSession(fwSession);
    mdObject = nssCKFWObject_GetMDObject(fwObject);
    mdOperation = fwMechanism->mdMechanism->VerifyRecoverInit(
        fwMechanism->mdMechanism,
        fwMechanism,
        pMechanism,
        mdSession,
        fwSession,
        fwMechanism->mdToken,
        fwMechanism->fwToken,
        fwMechanism->mdInstance,
        fwMechanism->fwInstance,
        mdObject,
        fwObject,
        &error);
    if (!mdOperation) {
        goto loser;
    }

    fwOperation = nssCKFWCryptoOperation_Create(mdOperation,
                                                mdSession, fwSession, fwMechanism->mdToken, fwMechanism->fwToken,
                                                fwMechanism->mdInstance, fwMechanism->fwInstance,
                                                NSSCKFWCryptoOperationType_VerifyRecover, &error);
    if (fwOperation) {
        nssCKFWSession_SetCurrentCryptoOperation(fwSession, fwOperation,
                                                 NSSCKFWCryptoOperationState_SignVerify);
    }

loser:
    return error;
}

/*
 * nssCKFWMechanism_GenerateKey
 */
NSS_EXTERN NSSCKFWObject *
nssCKFWMechanism_GenerateKey(
    NSSCKFWMechanism *fwMechanism,
    CK_MECHANISM_PTR pMechanism,
    NSSCKFWSession *fwSession,
    CK_ATTRIBUTE_PTR pTemplate,
    CK_ULONG ulAttributeCount,
    CK_RV *pError)
{
    NSSCKMDSession *mdSession;
    NSSCKMDObject *mdObject;
    NSSCKFWObject *fwObject = NULL;
    NSSArena *arena;

    if (!fwMechanism->mdMechanism->GenerateKey) {
        *pError = CKR_FUNCTION_FAILED;
        return (NSSCKFWObject *)NULL;
    }

    arena = nssCKFWToken_GetArena(fwMechanism->fwToken, pError);
    if (!arena) {
        if (CKR_OK == *pError) {
            *pError = CKR_GENERAL_ERROR;
        }
        return (NSSCKFWObject *)NULL;
    }

    mdSession = nssCKFWSession_GetMDSession(fwSession);
    mdObject = fwMechanism->mdMechanism->GenerateKey(
        fwMechanism->mdMechanism,
        fwMechanism,
        pMechanism,
        mdSession,
        fwSession,
        fwMechanism->mdToken,
        fwMechanism->fwToken,
        fwMechanism->mdInstance,
        fwMechanism->fwInstance,
        pTemplate,
        ulAttributeCount,
        pError);

    if (!mdObject) {
        return (NSSCKFWObject *)NULL;
    }

    fwObject = nssCKFWObject_Create(arena, mdObject,
                                    fwSession, fwMechanism->fwToken, fwMechanism->fwInstance, pError);

    return fwObject;
}

/*
 * nssCKFWMechanism_GenerateKeyPair
 */
NSS_EXTERN CK_RV
nssCKFWMechanism_GenerateKeyPair(
    NSSCKFWMechanism *fwMechanism,
    CK_MECHANISM_PTR pMechanism,
    NSSCKFWSession *fwSession,
    CK_ATTRIBUTE_PTR pPublicKeyTemplate,
    CK_ULONG ulPublicKeyAttributeCount,
    CK_ATTRIBUTE_PTR pPrivateKeyTemplate,
    CK_ULONG ulPrivateKeyAttributeCount,
    NSSCKFWObject **fwPublicKeyObject,
    NSSCKFWObject **fwPrivateKeyObject)
{
    NSSCKMDSession *mdSession;
    NSSCKMDObject *mdPublicKeyObject;
    NSSCKMDObject *mdPrivateKeyObject;
    NSSArena *arena;
    CK_RV error = CKR_OK;

    if (!fwMechanism->mdMechanism->GenerateKeyPair) {
        return CKR_FUNCTION_FAILED;
    }

    arena = nssCKFWToken_GetArena(fwMechanism->fwToken, &error);
    if (!arena) {
        if (CKR_OK == error) {
            error = CKR_GENERAL_ERROR;
        }
        return error;
    }

    mdSession = nssCKFWSession_GetMDSession(fwSession);
    error = fwMechanism->mdMechanism->GenerateKeyPair(
        fwMechanism->mdMechanism,
        fwMechanism,
        pMechanism,
        mdSession,
        fwSession,
        fwMechanism->mdToken,
        fwMechanism->fwToken,
        fwMechanism->mdInstance,
        fwMechanism->fwInstance,
        pPublicKeyTemplate,
        ulPublicKeyAttributeCount,
        pPrivateKeyTemplate,
        ulPrivateKeyAttributeCount,
        &mdPublicKeyObject,
        &mdPrivateKeyObject);

    if (CKR_OK != error) {
        return error;
    }

    *fwPublicKeyObject = nssCKFWObject_Create(arena, mdPublicKeyObject,
                                              fwSession, fwMechanism->fwToken, fwMechanism->fwInstance, &error);
    if (!*fwPublicKeyObject) {
        return error;
    }
    *fwPrivateKeyObject = nssCKFWObject_Create(arena, mdPrivateKeyObject,
                                               fwSession, fwMechanism->fwToken, fwMechanism->fwInstance, &error);

    return error;
}

/*
 * nssCKFWMechanism_GetWrapKeyLength
 */
NSS_EXTERN CK_ULONG
nssCKFWMechanism_GetWrapKeyLength(
    NSSCKFWMechanism *fwMechanism,
    CK_MECHANISM_PTR pMechanism,
    NSSCKFWSession *fwSession,
    NSSCKFWObject *fwWrappingKeyObject,
    NSSCKFWObject *fwKeyObject,
    CK_RV *pError)
{
    NSSCKMDSession *mdSession;
    NSSCKMDObject *mdWrappingKeyObject;
    NSSCKMDObject *mdKeyObject;

    if (!fwMechanism->mdMechanism->WrapKey) {
        *pError = CKR_FUNCTION_FAILED;
        return (CK_ULONG)0;
    }

    mdSession = nssCKFWSession_GetMDSession(fwSession);
    mdWrappingKeyObject = nssCKFWObject_GetMDObject(fwWrappingKeyObject);
    mdKeyObject = nssCKFWObject_GetMDObject(fwKeyObject);
    return fwMechanism->mdMechanism->GetWrapKeyLength(
        fwMechanism->mdMechanism,
        fwMechanism,
        pMechanism,
        mdSession,
        fwSession,
        fwMechanism->mdToken,
        fwMechanism->fwToken,
        fwMechanism->mdInstance,
        fwMechanism->fwInstance,
        mdWrappingKeyObject,
        fwWrappingKeyObject,
        mdKeyObject,
        fwKeyObject,
        pError);
}

/*
 * nssCKFWMechanism_WrapKey
 */
NSS_EXTERN CK_RV
nssCKFWMechanism_WrapKey(
    NSSCKFWMechanism *fwMechanism,
    CK_MECHANISM_PTR pMechanism,
    NSSCKFWSession *fwSession,
    NSSCKFWObject *fwWrappingKeyObject,
    NSSCKFWObject *fwKeyObject,
    NSSItem *wrappedKey)
{
    NSSCKMDSession *mdSession;
    NSSCKMDObject *mdWrappingKeyObject;
    NSSCKMDObject *mdKeyObject;

    if (!fwMechanism->mdMechanism->WrapKey) {
        return CKR_FUNCTION_FAILED;
    }

    mdSession = nssCKFWSession_GetMDSession(fwSession);
    mdWrappingKeyObject = nssCKFWObject_GetMDObject(fwWrappingKeyObject);
    mdKeyObject = nssCKFWObject_GetMDObject(fwKeyObject);
    return fwMechanism->mdMechanism->WrapKey(
        fwMechanism->mdMechanism,
        fwMechanism,
        pMechanism,
        mdSession,
        fwSession,
        fwMechanism->mdToken,
        fwMechanism->fwToken,
        fwMechanism->mdInstance,
        fwMechanism->fwInstance,
        mdWrappingKeyObject,
        fwWrappingKeyObject,
        mdKeyObject,
        fwKeyObject,
        wrappedKey);
}

/*
 * nssCKFWMechanism_UnwrapKey
 */
NSS_EXTERN NSSCKFWObject *
nssCKFWMechanism_UnwrapKey(
    NSSCKFWMechanism *fwMechanism,
    CK_MECHANISM_PTR pMechanism,
    NSSCKFWSession *fwSession,
    NSSCKFWObject *fwWrappingKeyObject,
    NSSItem *wrappedKey,
    CK_ATTRIBUTE_PTR pTemplate,
    CK_ULONG ulAttributeCount,
    CK_RV *pError)
{
    NSSCKMDSession *mdSession;
    NSSCKMDObject *mdObject;
    NSSCKMDObject *mdWrappingKeyObject;
    NSSCKFWObject *fwObject = NULL;
    NSSArena *arena;

    if (!fwMechanism->mdMechanism->UnwrapKey) {
        /* we could simulate UnwrapKey using Decrypt and Create object, but
         * 1) it's not clear that would work well, and 2) the low level token
         * may want to restrict unwrap key for a reason, so just fail it it
         * can't be done */
        *pError = CKR_FUNCTION_FAILED;
        return (NSSCKFWObject *)NULL;
    }

    arena = nssCKFWToken_GetArena(fwMechanism->fwToken, pError);
    if (!arena) {
        if (CKR_OK == *pError) {
            *pError = CKR_GENERAL_ERROR;
        }
        return (NSSCKFWObject *)NULL;
    }

    mdSession = nssCKFWSession_GetMDSession(fwSession);
    mdWrappingKeyObject = nssCKFWObject_GetMDObject(fwWrappingKeyObject);
    mdObject = fwMechanism->mdMechanism->UnwrapKey(
        fwMechanism->mdMechanism,
        fwMechanism,
        pMechanism,
        mdSession,
        fwSession,
        fwMechanism->mdToken,
        fwMechanism->fwToken,
        fwMechanism->mdInstance,
        fwMechanism->fwInstance,
        mdWrappingKeyObject,
        fwWrappingKeyObject,
        wrappedKey,
        pTemplate,
        ulAttributeCount,
        pError);

    if (!mdObject) {
        return (NSSCKFWObject *)NULL;
    }

    fwObject = nssCKFWObject_Create(arena, mdObject,
                                    fwSession, fwMechanism->fwToken, fwMechanism->fwInstance, pError);

    return fwObject;
}

/*
 * nssCKFWMechanism_DeriveKey
 */
NSS_EXTERN NSSCKFWObject *
nssCKFWMechanism_DeriveKey(
    NSSCKFWMechanism *fwMechanism,
    CK_MECHANISM_PTR pMechanism,
    NSSCKFWSession *fwSession,
    NSSCKFWObject *fwBaseKeyObject,
    CK_ATTRIBUTE_PTR pTemplate,
    CK_ULONG ulAttributeCount,
    CK_RV *pError)
{
    NSSCKMDSession *mdSession;
    NSSCKMDObject *mdObject;
    NSSCKMDObject *mdBaseKeyObject;
    NSSCKFWObject *fwObject = NULL;
    NSSArena *arena;

    if (!fwMechanism->mdMechanism->DeriveKey) {
        *pError = CKR_FUNCTION_FAILED;
        return (NSSCKFWObject *)NULL;
    }

    arena = nssCKFWToken_GetArena(fwMechanism->fwToken, pError);
    if (!arena) {
        if (CKR_OK == *pError) {
            *pError = CKR_GENERAL_ERROR;
        }
        return (NSSCKFWObject *)NULL;
    }

    mdSession = nssCKFWSession_GetMDSession(fwSession);
    mdBaseKeyObject = nssCKFWObject_GetMDObject(fwBaseKeyObject);
    mdObject = fwMechanism->mdMechanism->DeriveKey(
        fwMechanism->mdMechanism,
        fwMechanism,
        pMechanism,
        mdSession,
        fwSession,
        fwMechanism->mdToken,
        fwMechanism->fwToken,
        fwMechanism->mdInstance,
        fwMechanism->fwInstance,
        mdBaseKeyObject,
        fwBaseKeyObject,
        pTemplate,
        ulAttributeCount,
        pError);

    if (!mdObject) {
        return (NSSCKFWObject *)NULL;
    }

    fwObject = nssCKFWObject_Create(arena, mdObject,
                                    fwSession, fwMechanism->fwToken, fwMechanism->fwInstance, pError);

    return fwObject;
}
