lib/dns/pkcs11gost_link.c

	pkcs11gost_link.c revision 0c27b3fe77ac1d5094ba3521e8142d9e7973133f
/*
 * Copyright (C) 2014-2016  Internet Systems Consortium, Inc. ("ISC")
 *
 * 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/.
 */

#include <config.h>

#if defined(PKCS11CRYPTO) && defined(HAVE_PKCS11_GOST)

#include <isc/entropy.h>
#include <isc/mem.h>
#include <isc/safe.h>
#include <isc/sha2.h>
#include <isc/string.h>
#include <isc/util.h>

#include <dns/keyvalues.h>
#include <dns/log.h>
#include <dst/result.h>

#include "dst_internal.h"
#include "dst_parse.h"
#include "dst_pkcs11.h"
#include "dst_gost.h"

#include <pk11/pk11.h>
#include <pk11/internal.h>
#define WANT_GOST_PARAMS
#include <pk11/constants.h>

#include <pkcs11/pkcs11.h>

/*
 * RU CryptoPro GOST keys:
 *  mechanisms:
 *    CKM_GOSTR3411
 *    CKM_GOSTR3410_WITH_GOSTR3411
 *    CKM_GOSTR3410_KEY_PAIR_GEN
 *  domain parameters:
 *    CKA_GOSTR3410_PARAMS (fixed BER OID 1.2.643.2.2.35.1)
 *    CKA_GOSTR3411_PARAMS (fixed BER OID 1.2.643.2.2.30.1)
 *    CKA_GOST28147_PARAMS (optional, don't use)
 *  public keys:
 *    object class CKO_PUBLIC_KEY
 *    key type CKK_GOSTR3410
 *    attribute CKA_VALUE (point Q)
 *    attribute CKA_GOSTR3410_PARAMS
 *    attribute CKA_GOSTR3411_PARAMS
 *    attribute CKA_GOST28147_PARAMS
 *  private keys:
 *    object class CKO_PRIVATE_KEY
 *    key type CKK_GOSTR3410
 *    attribute CKA_VALUE (big int d)
 *    attribute CKA_GOSTR3410_PARAMS
 *    attribute CKA_GOSTR3411_PARAMS
 *    attribute CKA_GOST28147_PARAMS
 *  point format: <x> <y> (little endian)
 */

#define CKA_VALUE2          CKA_PRIVATE_EXPONENT

#define ISC_GOST_SIGNATURELENGTH    64
#define ISC_GOST_PUBKEYLENGTH       64
#define ISC_GOST_KEYSIZE        256

/* HASH methods */

isc_result_t
isc_gost_init(isc_gost_t *ctx) {
    CK_RV rv;
    CK_MECHANISM mech = { CKM_GOSTR3411, NULL, 0 };
    int ret = ISC_R_SUCCESS;

    ret = pk11_get_session(ctx, OP_GOST, ISC_TRUE, ISC_FALSE,
                   ISC_FALSE, NULL, 0);
    if (ret != ISC_R_SUCCESS)
        return (ret);
    PK11_CALL(pkcs_C_DigestInit, (ctx->session, &mech), ISC_R_FAILURE);
    return (ret);
}

void
isc_gost_invalidate(isc_gost_t *ctx) {
    CK_BYTE garbage[ISC_GOST_DIGESTLENGTH];
    CK_ULONG len = ISC_GOST_DIGESTLENGTH;

    if (ctx->handle == NULL)
        return;
    (void) pkcs_C_DigestFinal(ctx->session, garbage, &len);
    memset(garbage, 0, sizeof(garbage));
    pk11_return_session(ctx);
}

isc_result_t
isc_gost_update(isc_gost_t *ctx, const unsigned char *buf, unsigned int len) {
    CK_RV rv;
    CK_BYTE_PTR pPart;
    int ret = ISC_R_SUCCESS;

    DE_CONST(buf, pPart);
    PK11_CALL(pkcs_C_DigestUpdate,
          (ctx->session, pPart, (CK_ULONG) len),
          ISC_R_FAILURE);
    return (ret);
}

isc_result_t
isc_gost_final(isc_gost_t *ctx, unsigned char *digest) {
    CK_RV rv;
    CK_ULONG len = ISC_GOST_DIGESTLENGTH;
    int ret = ISC_R_SUCCESS;

    PK11_CALL(pkcs_C_DigestFinal,
          (ctx->session, (CK_BYTE_PTR) digest, &len),
          ISC_R_FAILURE);
    pk11_return_session(ctx);
    return (ret);
}

/* DST methods */

static CK_BBOOL truevalue = TRUE;
static CK_BBOOL falsevalue = FALSE;

#define DST_RET(a) {ret = a; goto err;}

static isc_result_t pkcs11gost_todns(const dst_key_t *key, isc_buffer_t *data);
static void pkcs11gost_destroy(dst_key_t *key);

static isc_result_t
pkcs11gost_createctx_sign(dst_key_t *key, dst_context_t *dctx) {
    CK_RV rv;
    CK_MECHANISM mech = { CKM_GOSTR3410_WITH_GOSTR3411, NULL, 0 };
    CK_OBJECT_CLASS keyClass = CKO_PRIVATE_KEY;
    CK_KEY_TYPE keyType = CKK_GOSTR3410;
    CK_ATTRIBUTE keyTemplate[] =
    {
        { CKA_CLASS, &keyClass, (CK_ULONG) sizeof(keyClass) },
        { CKA_KEY_TYPE, &keyType, (CK_ULONG) sizeof(keyType) },
        { CKA_TOKEN, &falsevalue, (CK_ULONG) sizeof(falsevalue) },
        { CKA_PRIVATE, &falsevalue, (CK_ULONG) sizeof(falsevalue) },
        { CKA_SENSITIVE, &falsevalue, (CK_ULONG) sizeof(falsevalue) },
        { CKA_SIGN, &truevalue, (CK_ULONG) sizeof(truevalue) },
        { CKA_VALUE, NULL, 0 },
        { CKA_GOSTR3410_PARAMS, pk11_gost_a_paramset,
          (CK_ULONG) sizeof(pk11_gost_a_paramset) },
        { CKA_GOSTR3411_PARAMS, pk11_gost_paramset,
          (CK_ULONG) sizeof(pk11_gost_paramset) }
    };
    CK_ATTRIBUTE *attr;
    pk11_object_t *gost;
    pk11_context_t *pk11_ctx;
    isc_result_t ret;
    unsigned int i;

    pk11_ctx = (pk11_context_t *) isc_mem_get(dctx->mctx,
                          sizeof(*pk11_ctx));
    if (pk11_ctx == NULL)
        return (ISC_R_NOMEMORY);
    ret = pk11_get_session(pk11_ctx, OP_GOST, ISC_TRUE, ISC_FALSE,
                   ISC_FALSE, NULL, pk11_get_best_token(OP_GOST));
    if (ret != ISC_R_SUCCESS)
        goto err;

    gost = key->keydata.pkey;
    if (gost->ontoken && (gost->object != CK_INVALID_HANDLE)) {
        pk11_ctx->ontoken = gost->ontoken;
        pk11_ctx->object = gost->object;
        goto token_key;
    }

    for (attr = pk11_attribute_first(gost);
         attr != NULL;
         attr = pk11_attribute_next(gost, attr))
        switch (attr->type) {
        case CKA_VALUE2:
            INSIST(keyTemplate[6].type == CKA_VALUE);
            keyTemplate[6].pValue = isc_mem_get(dctx->mctx,
                                attr->ulValueLen);
            if (keyTemplate[6].pValue == NULL)
                DST_RET(ISC_R_NOMEMORY);
            memmove(keyTemplate[6].pValue, attr->pValue,
                attr->ulValueLen);
            keyTemplate[6].ulValueLen = attr->ulValueLen;
            break;
        }
    pk11_ctx->object = CK_INVALID_HANDLE;
    pk11_ctx->ontoken = ISC_FALSE;
    PK11_RET(pkcs_C_CreateObject,
         (pk11_ctx->session,
          keyTemplate, (CK_ULONG) 9,
          &pk11_ctx->object),
         ISC_R_FAILURE);

    token_key:

    PK11_RET(pkcs_C_SignInit,
         (pk11_ctx->session, &mech, pk11_ctx->object),
         ISC_R_FAILURE);

    dctx->ctxdata.pk11_ctx = pk11_ctx;

    for (i = 6; i <= 6; i++)
        if (keyTemplate[i].pValue != NULL) {
            memset(keyTemplate[i].pValue, 0,
                   keyTemplate[i].ulValueLen);
            isc_mem_put(dctx->mctx,
                    keyTemplate[i].pValue,
                    keyTemplate[i].ulValueLen);
        }

    return (ISC_R_SUCCESS);

    err:
    if (!pk11_ctx->ontoken && (pk11_ctx->object != CK_INVALID_HANDLE))
        (void) pkcs_C_DestroyObject(pk11_ctx->session, pk11_ctx->object);
    for (i = 6; i <= 6; i++)
        if (keyTemplate[i].pValue != NULL) {
            memset(keyTemplate[i].pValue, 0,
                   keyTemplate[i].ulValueLen);
            isc_mem_put(dctx->mctx,
                    keyTemplate[i].pValue,
                    keyTemplate[i].ulValueLen);
        }
    pk11_return_session(pk11_ctx);
    memset(pk11_ctx, 0, sizeof(*pk11_ctx));
    isc_mem_put(dctx->mctx, pk11_ctx, sizeof(*pk11_ctx));

    return (ret);
}

static isc_result_t
pkcs11gost_createctx_verify(dst_key_t *key, dst_context_t *dctx) {
    CK_RV rv;
    CK_MECHANISM mech = { CKM_GOSTR3410_WITH_GOSTR3411, NULL, 0 };
    CK_OBJECT_CLASS keyClass = CKO_PUBLIC_KEY;
    CK_KEY_TYPE keyType = CKK_GOSTR3410;
    CK_ATTRIBUTE keyTemplate[] =
    {
        { CKA_CLASS, &keyClass, (CK_ULONG) sizeof(keyClass) },
        { CKA_KEY_TYPE, &keyType, (CK_ULONG) sizeof(keyType) },
        { CKA_TOKEN, &falsevalue, (CK_ULONG) sizeof(falsevalue) },
        { CKA_PRIVATE, &falsevalue, (CK_ULONG) sizeof(falsevalue) },
        { CKA_VERIFY, &truevalue, (CK_ULONG) sizeof(truevalue) },
        { CKA_VALUE, NULL, 0 },
        { CKA_GOSTR3410_PARAMS, pk11_gost_a_paramset,
          (CK_ULONG) sizeof(pk11_gost_a_paramset) },
        { CKA_GOSTR3411_PARAMS, pk11_gost_paramset,
          (CK_ULONG) sizeof(pk11_gost_paramset) }
    };
    CK_ATTRIBUTE *attr;
    pk11_object_t *gost;
    pk11_context_t *pk11_ctx;
    isc_result_t ret;
    unsigned int i;

    pk11_ctx = (pk11_context_t *) isc_mem_get(dctx->mctx,
                          sizeof(*pk11_ctx));
    if (pk11_ctx == NULL)
        return (ISC_R_NOMEMORY);
    ret = pk11_get_session(pk11_ctx, OP_GOST, ISC_TRUE, ISC_FALSE,
                   ISC_FALSE, NULL, pk11_get_best_token(OP_GOST));
    if (ret != ISC_R_SUCCESS)
        goto err;

    gost = key->keydata.pkey;
    if (gost->ontoken && (gost->object != CK_INVALID_HANDLE)) {
        pk11_ctx->ontoken = gost->ontoken;
        pk11_ctx->object = gost->object;
        goto token_key;
    }

    for (attr = pk11_attribute_first(gost);
         attr != NULL;
         attr = pk11_attribute_next(gost, attr))
        switch (attr->type) {
        case CKA_VALUE:
            INSIST(keyTemplate[5].type == attr->type);
            keyTemplate[5].pValue = isc_mem_get(dctx->mctx,
                                attr->ulValueLen);
            if (keyTemplate[5].pValue == NULL)
                DST_RET(ISC_R_NOMEMORY);
            memmove(keyTemplate[5].pValue, attr->pValue,
                attr->ulValueLen);
            keyTemplate[5].ulValueLen = attr->ulValueLen;
            break;
        }
    pk11_ctx->object = CK_INVALID_HANDLE;
    pk11_ctx->ontoken = ISC_FALSE;
    PK11_RET(pkcs_C_CreateObject,
         (pk11_ctx->session,
          keyTemplate, (CK_ULONG) 8,
          &pk11_ctx->object),
         ISC_R_FAILURE);

    token_key:

    PK11_RET(pkcs_C_VerifyInit,
         (pk11_ctx->session, &mech, pk11_ctx->object),
         ISC_R_FAILURE);

    dctx->ctxdata.pk11_ctx = pk11_ctx;

    for (i = 5; i <= 5; i++)
        if (keyTemplate[i].pValue != NULL) {
            memset(keyTemplate[i].pValue, 0,
                   keyTemplate[i].ulValueLen);
            isc_mem_put(dctx->mctx,
                    keyTemplate[i].pValue,
                    keyTemplate[i].ulValueLen);
        }

    return (ISC_R_SUCCESS);

    err:
    if (!pk11_ctx->ontoken && (pk11_ctx->object != CK_INVALID_HANDLE))
        (void) pkcs_C_DestroyObject(pk11_ctx->session, pk11_ctx->object);
    for (i = 5; i <= 5; i++)
        if (keyTemplate[i].pValue != NULL) {
            memset(keyTemplate[i].pValue, 0,
                   keyTemplate[i].ulValueLen);
            isc_mem_put(dctx->mctx,
                    keyTemplate[i].pValue,
                    keyTemplate[i].ulValueLen);
        }
    pk11_return_session(pk11_ctx);
    memset(pk11_ctx, 0, sizeof(*pk11_ctx));
    isc_mem_put(dctx->mctx, pk11_ctx, sizeof(*pk11_ctx));

    return (ret);
}

static isc_result_t
pkcs11gost_createctx(dst_key_t *key, dst_context_t *dctx) {
    if (dctx->use == DO_SIGN)
        return (pkcs11gost_createctx_sign(key, dctx));
    else
        return (pkcs11gost_createctx_verify(key, dctx));
}

static void
pkcs11gost_destroyctx(dst_context_t *dctx) {
    pk11_context_t *pk11_ctx = dctx->ctxdata.pk11_ctx;

    if (pk11_ctx != NULL) {
        if (!pk11_ctx->ontoken &&
            (pk11_ctx->object != CK_INVALID_HANDLE))
            (void) pkcs_C_DestroyObject(pk11_ctx->session,
                           pk11_ctx->object);
        pk11_return_session(pk11_ctx);
        memset(pk11_ctx, 0, sizeof(*pk11_ctx));
        isc_mem_put(dctx->mctx, pk11_ctx, sizeof(*pk11_ctx));
        dctx->ctxdata.pk11_ctx = NULL;
    }
}

static isc_result_t
pkcs11gost_adddata(dst_context_t *dctx, const isc_region_t *data) {
    CK_RV rv;
    pk11_context_t *pk11_ctx = dctx->ctxdata.pk11_ctx;
    isc_result_t ret = ISC_R_SUCCESS;

    if (dctx->use == DO_SIGN)
        PK11_CALL(pkcs_C_SignUpdate,
              (pk11_ctx->session,
               (CK_BYTE_PTR) data->base,
               (CK_ULONG) data->length),
              ISC_R_FAILURE);
    else
        PK11_CALL(pkcs_C_VerifyUpdate,
              (pk11_ctx->session,
               (CK_BYTE_PTR) data->base,
               (CK_ULONG) data->length),
              ISC_R_FAILURE);
    return (ret);
}

static isc_result_t
pkcs11gost_sign(dst_context_t *dctx, isc_buffer_t *sig) {
    CK_RV rv;
    CK_ULONG siglen = ISC_GOST_SIGNATURELENGTH;
    isc_region_t r;
    pk11_context_t *pk11_ctx = dctx->ctxdata.pk11_ctx;
    isc_result_t ret = ISC_R_SUCCESS;

    isc_buffer_availableregion(sig, &r);
    if (r.length < ISC_GOST_SIGNATURELENGTH)
        return (ISC_R_NOSPACE);

    PK11_RET(pkcs_C_SignFinal,
         (pk11_ctx->session, (CK_BYTE_PTR) r.base, &siglen),
         DST_R_SIGNFAILURE);
    if (siglen != ISC_GOST_SIGNATURELENGTH)
        return (DST_R_SIGNFAILURE);

    isc_buffer_add(sig, ISC_GOST_SIGNATURELENGTH);

    err:
    return (ret);
}

static isc_result_t
pkcs11gost_verify(dst_context_t *dctx, const isc_region_t *sig) {
    CK_RV rv;
    pk11_context_t *pk11_ctx = dctx->ctxdata.pk11_ctx;
    isc_result_t ret = ISC_R_SUCCESS;

    PK11_CALL(pkcs_C_VerifyFinal,
          (pk11_ctx->session,
           (CK_BYTE_PTR) sig->base,
           (CK_ULONG) sig->length),
          DST_R_VERIFYFAILURE);
    return (ret);
}

static isc_boolean_t
pkcs11gost_compare(const dst_key_t *key1, const dst_key_t *key2) {
    pk11_object_t *gost1, *gost2;
    CK_ATTRIBUTE *attr1, *attr2;

    gost1 = key1->keydata.pkey;
    gost2 = key2->keydata.pkey;

    if ((gost1 == NULL) && (gost2 == NULL))
        return (ISC_TRUE);
    else if ((gost1 == NULL) || (gost2 == NULL))
        return (ISC_FALSE);

    attr1 = pk11_attribute_bytype(gost1, CKA_VALUE);
    attr2 = pk11_attribute_bytype(gost2, CKA_VALUE);
    if ((attr1 == NULL) && (attr2 == NULL))
        return (ISC_TRUE);
    else if ((attr1 == NULL) || (attr2 == NULL) ||
         (attr1->ulValueLen != attr2->ulValueLen) ||
         !isc_safe_memequal(attr1->pValue, attr2->pValue,
                    attr1->ulValueLen))
        return (ISC_FALSE);

    attr1 = pk11_attribute_bytype(gost1, CKA_VALUE2);
    attr2 = pk11_attribute_bytype(gost2, CKA_VALUE2);
    if (((attr1 != NULL) || (attr2 != NULL)) &&
        ((attr1 == NULL) || (attr2 == NULL) ||
         (attr1->ulValueLen != attr2->ulValueLen) ||
         !isc_safe_memequal(attr1->pValue, attr2->pValue,
                attr1->ulValueLen)))
        return (ISC_FALSE);

    if (!gost1->ontoken && !gost2->ontoken)
        return (ISC_TRUE);
    else if (gost1->ontoken || gost2->ontoken ||
         (gost1->object != gost2->object))
        return (ISC_FALSE);

    return (ISC_TRUE);
}

static isc_result_t
pkcs11gost_generate(dst_key_t *key, int unused, void (*callback)(int)) {
    CK_RV rv;
    CK_MECHANISM mech = { CKM_GOSTR3410_KEY_PAIR_GEN, NULL, 0 };
    CK_KEY_TYPE  keyType = CKK_GOSTR3410;
    CK_OBJECT_HANDLE pub = CK_INVALID_HANDLE;
    CK_OBJECT_CLASS pubClass = CKO_PUBLIC_KEY;
    CK_ATTRIBUTE pubTemplate[] =
    {
        { CKA_CLASS, &pubClass, (CK_ULONG) sizeof(pubClass) },
        { CKA_KEY_TYPE, &keyType, (CK_ULONG) sizeof(keyType) },
        { CKA_TOKEN, &falsevalue, (CK_ULONG) sizeof(falsevalue) },
        { CKA_PRIVATE, &falsevalue, (CK_ULONG) sizeof(falsevalue) },
        { CKA_VERIFY, &truevalue, (CK_ULONG) sizeof(truevalue) },
        { CKA_GOSTR3410_PARAMS, pk11_gost_a_paramset,
          (CK_ULONG) sizeof(pk11_gost_a_paramset) },
        { CKA_GOSTR3411_PARAMS, pk11_gost_paramset,
          (CK_ULONG) sizeof(pk11_gost_paramset) }
    };
    CK_OBJECT_HANDLE priv = CK_INVALID_HANDLE;
    CK_OBJECT_HANDLE privClass = CKO_PRIVATE_KEY;
    CK_ATTRIBUTE privTemplate[] =
    {
        { CKA_CLASS, &privClass, (CK_ULONG) sizeof(privClass) },
        { CKA_KEY_TYPE, &keyType, (CK_ULONG) sizeof(keyType) },
        { CKA_TOKEN, &falsevalue, (CK_ULONG) sizeof(falsevalue) },
        { CKA_PRIVATE, &falsevalue, (CK_ULONG) sizeof(falsevalue) },
        { CKA_SENSITIVE, &falsevalue, (CK_ULONG) sizeof(falsevalue) },
        { CKA_EXTRACTABLE, &truevalue, (CK_ULONG) sizeof(truevalue) },
        { CKA_SIGN, &truevalue, (CK_ULONG) sizeof(truevalue) },
    };
    CK_ATTRIBUTE *attr;
    pk11_object_t *gost;
    pk11_context_t *pk11_ctx;
    isc_result_t ret;

    UNUSED(unused);
    UNUSED(callback);

    pk11_ctx = (pk11_context_t *) isc_mem_get(key->mctx,
                          sizeof(*pk11_ctx));
    if (pk11_ctx == NULL)
        return (ISC_R_NOMEMORY);
    ret = pk11_get_session(pk11_ctx, OP_GOST, ISC_TRUE, ISC_FALSE,
                   ISC_FALSE, NULL, pk11_get_best_token(OP_GOST));
    if (ret != ISC_R_SUCCESS)
        goto err;

    PK11_RET(pkcs_C_GenerateKeyPair,
         (pk11_ctx->session, &mech,
          pubTemplate, (CK_ULONG) 7,
          privTemplate, (CK_ULONG) 7,
          &pub, &priv),
         DST_R_CRYPTOFAILURE);

    gost = (pk11_object_t *) isc_mem_get(key->mctx, sizeof(*gost));
    if (gost == NULL)
        DST_RET(ISC_R_NOMEMORY);
    memset(gost, 0, sizeof(*gost));
    key->keydata.pkey = gost;
    key->key_size = ISC_GOST_KEYSIZE;
    gost->repr = (CK_ATTRIBUTE *) isc_mem_get(key->mctx,
                          sizeof(*attr) * 2);
    if (gost->repr == NULL)
        DST_RET(ISC_R_NOMEMORY);
    memset(gost->repr, 0, sizeof(*attr) * 2);
    gost->attrcnt = 2;

    attr = gost->repr;
    attr[0].type = CKA_VALUE;
    attr[1].type = CKA_VALUE2;

    attr = gost->repr;
    PK11_RET(pkcs_C_GetAttributeValue,
         (pk11_ctx->session, pub, attr, 1),
         DST_R_CRYPTOFAILURE);
    attr->pValue = isc_mem_get(key->mctx, attr->ulValueLen);
    if (attr->pValue == NULL)
        DST_RET(ISC_R_NOMEMORY);
    memset(attr->pValue, 0, attr->ulValueLen);
    PK11_RET(pkcs_C_GetAttributeValue,
         (pk11_ctx->session, pub, attr, 1),
         DST_R_CRYPTOFAILURE);

    attr++;
    attr->type = CKA_VALUE;
    PK11_RET(pkcs_C_GetAttributeValue,
         (pk11_ctx->session, priv, attr, 1),
         DST_R_CRYPTOFAILURE);
    attr->pValue = isc_mem_get(key->mctx, attr->ulValueLen);
    if (attr->pValue == NULL)
        DST_RET(ISC_R_NOMEMORY);
    memset(attr->pValue, 0, attr->ulValueLen);
    PK11_RET(pkcs_C_GetAttributeValue,
         (pk11_ctx->session, priv, attr, 1),
         DST_R_CRYPTOFAILURE);
    attr->type = CKA_VALUE2;

    (void) pkcs_C_DestroyObject(pk11_ctx->session, priv);
    (void) pkcs_C_DestroyObject(pk11_ctx->session, pub);
    pk11_return_session(pk11_ctx);
    memset(pk11_ctx, 0, sizeof(*pk11_ctx));
    isc_mem_put(key->mctx, pk11_ctx, sizeof(*pk11_ctx));

    return (ISC_R_SUCCESS);

    err:
    pkcs11gost_destroy(key);
    if (priv != CK_INVALID_HANDLE)
        (void) pkcs_C_DestroyObject(pk11_ctx->session, priv);
    if (pub != CK_INVALID_HANDLE)
        (void) pkcs_C_DestroyObject(pk11_ctx->session, pub);
    pk11_return_session(pk11_ctx);
    memset(pk11_ctx, 0, sizeof(*pk11_ctx));
    isc_mem_put(key->mctx, pk11_ctx, sizeof(*pk11_ctx));

    return (ret);
}

static isc_boolean_t
pkcs11gost_isprivate(const dst_key_t *key) {
    pk11_object_t *gost = key->keydata.pkey;
    CK_ATTRIBUTE *attr;

    if (gost == NULL)
        return (ISC_FALSE);
    attr = pk11_attribute_bytype(gost, CKA_VALUE2);
    return (ISC_TF((attr != NULL) || gost->ontoken));
}

static void
pkcs11gost_destroy(dst_key_t *key) {
    pk11_object_t *gost = key->keydata.pkey;
    CK_ATTRIBUTE *attr;

    if (gost == NULL)
        return;

    INSIST((gost->object == CK_INVALID_HANDLE) || gost->ontoken);

    for (attr = pk11_attribute_first(gost);
         attr != NULL;
         attr = pk11_attribute_next(gost, attr))
        switch (attr->type) {
        case CKA_VALUE:
        case CKA_VALUE2:
            if (attr->pValue != NULL) {
                memset(attr->pValue, 0, attr->ulValueLen);
                isc_mem_put(key->mctx,
                        attr->pValue,
                        attr->ulValueLen);
            }
            break;
        }
    if (gost->repr != NULL) {
        memset(gost->repr, 0, gost->attrcnt * sizeof(*attr));
        isc_mem_put(key->mctx,
                gost->repr,
                gost->attrcnt * sizeof(*attr));
    }
    memset(gost, 0, sizeof(*gost));
    isc_mem_put(key->mctx, gost, sizeof(*gost));
    key->keydata.pkey = NULL;
}

static isc_result_t
pkcs11gost_todns(const dst_key_t *key, isc_buffer_t *data) {
    pk11_object_t *gost;
    isc_region_t r;
    CK_ATTRIBUTE *attr;

    REQUIRE(key->keydata.pkey != NULL);

    gost = key->keydata.pkey;
    attr = pk11_attribute_bytype(gost, CKA_VALUE);
    if ((attr == NULL) || (attr->ulValueLen != ISC_GOST_PUBKEYLENGTH))
        return (ISC_R_FAILURE);

    isc_buffer_availableregion(data, &r);
    if (r.length < ISC_GOST_PUBKEYLENGTH)
        return (ISC_R_NOSPACE);
    memmove(r.base, (CK_BYTE_PTR) attr->pValue, ISC_GOST_PUBKEYLENGTH);
    isc_buffer_add(data, ISC_GOST_PUBKEYLENGTH);

    return (ISC_R_SUCCESS);
}

static isc_result_t
pkcs11gost_fromdns(dst_key_t *key, isc_buffer_t *data) {
    pk11_object_t *gost;
    isc_region_t r;
    CK_ATTRIBUTE *attr;

    isc_buffer_remainingregion(data, &r);
    if (r.length == 0)
        return (ISC_R_SUCCESS);
    if (r.length != ISC_GOST_PUBKEYLENGTH)
        return (DST_R_INVALIDPUBLICKEY);

    gost = (pk11_object_t *) isc_mem_get(key->mctx, sizeof(*gost));
    if (gost == NULL)
        return (ISC_R_NOMEMORY);
    memset(gost, 0, sizeof(*gost));
    gost->repr = (CK_ATTRIBUTE *) isc_mem_get(key->mctx, sizeof(*attr));
    if (gost->repr == NULL)
        goto nomemory;
    gost->attrcnt = 1;

    attr = gost->repr;
    attr->type = CKA_VALUE;
    attr->pValue = isc_mem_get(key->mctx, ISC_GOST_PUBKEYLENGTH);
    if (attr->pValue == NULL)
        goto nomemory;
    memmove((CK_BYTE_PTR) attr->pValue, r.base, ISC_GOST_PUBKEYLENGTH);
    attr->ulValueLen = ISC_GOST_PUBKEYLENGTH;

    isc_buffer_forward(data, ISC_GOST_PUBKEYLENGTH);
    key->keydata.pkey = gost;
    key->key_size = ISC_GOST_KEYSIZE;
    return (ISC_R_SUCCESS);

 nomemory:
    for (attr = pk11_attribute_first(gost);
         attr != NULL;
         attr = pk11_attribute_next(gost, attr))
        switch (attr->type) {
        case CKA_VALUE:
            if (attr->pValue != NULL) {
                memset(attr->pValue, 0, attr->ulValueLen);
                isc_mem_put(key->mctx,
                        attr->pValue,
                        attr->ulValueLen);
            }
            break;
        }
    if (gost->repr != NULL) {
        memset(gost->repr, 0, gost->attrcnt * sizeof(*attr));
        isc_mem_put(key->mctx,
                gost->repr,
                gost->attrcnt * sizeof(*attr));
    }
    memset(gost, 0, sizeof(*gost));
    isc_mem_put(key->mctx, gost, sizeof(*gost));
    return (ISC_R_NOMEMORY);
}

static unsigned char gost_private_der[39] = {
    0x30, 0x45, 0x02, 0x01, 0x00, 0x30, 0x1c, 0x06,
    0x06, 0x2a, 0x85, 0x03, 0x02, 0x02, 0x13, 0x30,
    0x12, 0x06, 0x07, 0x2a, 0x85, 0x03, 0x02, 0x02,
    0x23, 0x01, 0x06, 0x07, 0x2a, 0x85, 0x03, 0x02,
    0x02, 0x1e, 0x01, 0x04, 0x22, 0x02, 0x20
};

#ifdef PREFER_GOSTASN1

static isc_result_t
pkcs11gost_tofile(const dst_key_t *key, const char *directory) {
    isc_result_t ret;
    pk11_object_t *gost;
    dst_private_t priv;
    unsigned char *buf = NULL;
    unsigned int i = 0;
    CK_ATTRIBUTE *attr;
    int adj;

    if (key->keydata.pkey == NULL)
        return (DST_R_NULLKEY);

    if (key->external) {
        priv.nelements = 0;
        return (dst__privstruct_writefile(key, &priv, directory));
    }

    gost = key->keydata.pkey;
    attr = pk11_attribute_bytype(gost, CKA_VALUE2);
    if (attr != NULL) {
        buf = isc_mem_get(key->mctx, attr->ulValueLen + 39);
        if (buf == NULL)
            return (ISC_R_NOMEMORY);
        priv.elements[i].tag = TAG_GOST_PRIVASN1;
        priv.elements[i].length =
            (unsigned short) attr->ulValueLen + 39;
        memmove(buf, gost_private_der, 39);
        memmove(buf + 39, attr->pValue, attr->ulValueLen);
        adj = (int) attr->ulValueLen - 32;
        if (adj != 0) {
            buf[1] += adj;
            buf[36] += adj;
            buf[38] += adj;
        }
        priv.elements[i].data = buf;
        i++;
    } else
        return (DST_R_CRYPTOFAILURE);

    priv.nelements = i;
    ret = dst__privstruct_writefile(key, &priv, directory);

    if (buf != NULL) {
        memset(buf, 0, attr->ulValueLen);
        isc_mem_put(key->mctx, buf, attr->ulValueLen);
    }
    return (ret);
}

#else

static isc_result_t
pkcs11gost_tofile(const dst_key_t *key, const char *directory) {
    isc_result_t ret;
    pk11_object_t *gost;
    dst_private_t priv;
    unsigned char *buf = NULL;
    unsigned int i = 0;
    CK_ATTRIBUTE *attr;

    if (key->keydata.pkey == NULL)
        return (DST_R_NULLKEY);

    if (key->external) {
        priv.nelements = 0;
        return (dst__privstruct_writefile(key, &priv, directory));
    }

    gost = key->keydata.pkey;
    attr = pk11_attribute_bytype(gost, CKA_VALUE2);
    if (attr != NULL) {
        buf = isc_mem_get(key->mctx, attr->ulValueLen);
        if (buf == NULL)
            return (ISC_R_NOMEMORY);
        priv.elements[i].tag = TAG_GOST_PRIVRAW;
        priv.elements[i].length = (unsigned short) attr->ulValueLen;
        memmove(buf, attr->pValue, attr->ulValueLen);
        priv.elements[i].data = buf;
        i++;
    } else
        return (DST_R_CRYPTOFAILURE);

    priv.nelements = i;
    ret = dst__privstruct_writefile(key, &priv, directory);

    if (buf != NULL) {
        memset(buf, 0, attr->ulValueLen);
        isc_mem_put(key->mctx, buf, attr->ulValueLen);
    }
    return (ret);
}
#endif

static isc_result_t
pkcs11gost_parse(dst_key_t *key, isc_lex_t *lexer, dst_key_t *pub) {
    dst_private_t priv;
    isc_result_t ret;
    pk11_object_t *gost = NULL;
    CK_ATTRIBUTE *attr, *pattr;
    isc_mem_t *mctx = key->mctx;

    if ((pub == NULL) || (pub->keydata.pkey == NULL))
        DST_RET(DST_R_INVALIDPRIVATEKEY);

    /* read private key file */
    ret = dst__privstruct_parse(key, DST_ALG_ECDSA256, lexer, mctx, &priv);
    if (ret != ISC_R_SUCCESS)
        return (ret);

    if (key->external) {
        if (priv.nelements != 0)
            DST_RET(DST_R_INVALIDPRIVATEKEY);

        key->keydata.pkey = pub->keydata.pkey;
        pub->keydata.pkey = NULL;
        key->key_size = pub->key_size;

        dst__privstruct_free(&priv, mctx);
        memset(&priv, 0, sizeof(priv));

        return (ISC_R_SUCCESS);
    }

    if (priv.elements[0].tag == TAG_GOST_PRIVASN1) {
        int adj = (int) priv.elements[0].length - (39 + 32);
        unsigned char buf[39];

        if ((adj > 0) || (adj < -31))
            DST_RET(DST_R_INVALIDPRIVATEKEY);
        memmove(buf, gost_private_der, 39);
        if (adj != 0) {
            buf[1] += adj;
            buf[36] += adj;
            buf[38] += adj;
        }
        if (!isc_safe_memequal(priv.elements[0].data, buf, 39))
            DST_RET(DST_R_INVALIDPRIVATEKEY);
        priv.elements[0].tag = TAG_GOST_PRIVRAW;
        priv.elements[0].length -= 39;
        memmove(priv.elements[0].data,
            priv.elements[0].data + 39,
            32 + adj);
    }

    gost = (pk11_object_t *) isc_mem_get(key->mctx, sizeof(*gost));
    if (gost == NULL)
        DST_RET(ISC_R_NOMEMORY);
    memset(gost, 0, sizeof(*gost));
    key->keydata.pkey = gost;
    key->key_size = ISC_GOST_KEYSIZE;

    gost->repr = (CK_ATTRIBUTE *) isc_mem_get(key->mctx,
                          sizeof(*attr) * 2);
    if (gost->repr == NULL)
        DST_RET(ISC_R_NOMEMORY);
    memset(gost->repr, 0, sizeof(*attr) * 2);
    gost->attrcnt = 2;

    attr = gost->repr;
    attr->type = CKA_VALUE;
    pattr = pk11_attribute_bytype(pub->keydata.pkey, CKA_VALUE);
    INSIST(pattr != NULL);
    attr->pValue = isc_mem_get(key->mctx, pattr->ulValueLen);
    if (attr->pValue == NULL)
        DST_RET(ISC_R_NOMEMORY);
    memmove(attr->pValue, pattr->pValue, pattr->ulValueLen);
    attr->ulValueLen = pattr->ulValueLen;

    attr++;
    attr->type = CKA_VALUE2;
    attr->pValue = isc_mem_get(key->mctx, priv.elements[0].length);
    if (attr->pValue == NULL)
        DST_RET(ISC_R_NOMEMORY);
    memmove(attr->pValue, priv.elements[0].data, priv.elements[0].length);
    attr->ulValueLen = priv.elements[0].length;

    dst__privstruct_free(&priv, mctx);
    memset(&priv, 0, sizeof(priv));

    return (ISC_R_SUCCESS);

 err:
    pkcs11gost_destroy(key);
    dst__privstruct_free(&priv, mctx);
    memset(&priv, 0, sizeof(priv));
    return (ret);
}

static dst_func_t pkcs11gost_functions = {
    pkcs11gost_createctx,
    NULL, /*%< createctx2 */
    pkcs11gost_destroyctx,
    pkcs11gost_adddata,
    pkcs11gost_sign,
    pkcs11gost_verify,
    NULL, /*%< verify2 */
    NULL, /*%< computesecret */
    pkcs11gost_compare,
    NULL, /*%< paramcompare */
    pkcs11gost_generate,
    pkcs11gost_isprivate,
    pkcs11gost_destroy,
    pkcs11gost_todns,
    pkcs11gost_fromdns,
    pkcs11gost_tofile,
    pkcs11gost_parse,
    NULL, /*%< cleanup */
    NULL, /*%< fromlabel */
    NULL, /*%< dump */
    NULL, /*%< restore */
};

isc_result_t
dst__pkcs11gost_init(dst_func_t **funcp) {
    REQUIRE(funcp != NULL);
    if (*funcp == NULL)
        *funcp = &pkcs11gost_functions;
    return (ISC_R_SUCCESS);
}

#else /* PKCS11CRYPTO && HAVE_PKCS11_GOST */

#include <isc/util.h>

EMPTY_TRANSLATION_UNIT

#endif /* PKCS11CRYPTO && HAVE_PKCS11_GOST */
/*! \file */