/* $OpenBSD: e_gost2814789.c,v 1.10 2022/09/10 17:39:47 jsing Exp $ */
/*
 * Copyright (c) 2014 Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
 * Copyright (c) 2005-2006 Cryptocom LTD
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. All advertising materials mentioning features or use of this
 *    software must display the following acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
 *
 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please contact
 *    openssl-core@openssl.org.
 *
 * 5. Products derived from this software may not be called "OpenSSL"
 *    nor may "OpenSSL" appear in their names without prior written
 *    permission of the OpenSSL Project.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
 *
 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 * ====================================================================
 */

#include <string.h>

#include <openssl/opensslconf.h>

#ifndef OPENSSL_NO_GOST
#include <openssl/evp.h>
#include <openssl/err.h>
#include <openssl/gost.h>

#include "evp_locl.h"

typedef struct {
        GOST2814789_KEY ks;
        int param_nid;
} EVP_GOST2814789_CTX;

static int
gost2814789_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
    const unsigned char *iv, int enc)
{
        EVP_GOST2814789_CTX *c = ctx->cipher_data;

        return Gost2814789_set_key(&c->ks, key, ctx->key_len * 8);
}

static int
gost2814789_ctl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr)
{
        EVP_GOST2814789_CTX *c = ctx->cipher_data;

        switch (type) {
        case EVP_CTRL_PBE_PRF_NID:
                if (ptr != NULL) {
                        *((int *)ptr) = NID_id_HMACGostR3411_94;
                        return 1;
                } else {
                        return 0;
                }
        case EVP_CTRL_INIT:
                /* Default value to have any s-box set at all */
                c->param_nid = NID_id_Gost28147_89_CryptoPro_A_ParamSet;
                return Gost2814789_set_sbox(&c->ks, c->param_nid);
        case EVP_CTRL_GOST_SET_SBOX:
                return Gost2814789_set_sbox(&c->ks, arg);
        default:
                return -1;
        }
}

int
gost2814789_set_asn1_params(EVP_CIPHER_CTX *ctx, ASN1_TYPE *params)
{
        int len = 0;
        unsigned char *buf = NULL;
        unsigned char *p = NULL;
        EVP_GOST2814789_CTX *c = ctx->cipher_data;
        ASN1_OCTET_STRING *os = NULL;
        GOST_CIPHER_PARAMS *gcp = GOST_CIPHER_PARAMS_new();

        if (gcp == NULL) {
                GOSTerror(ERR_R_MALLOC_FAILURE);
                return 0;
        }
        if (ASN1_OCTET_STRING_set(gcp->iv, ctx->iv, ctx->cipher->iv_len) == 0) {
                GOST_CIPHER_PARAMS_free(gcp);
                GOSTerror(ERR_R_ASN1_LIB);
                return 0;
        }
        ASN1_OBJECT_free(gcp->enc_param_set);
        gcp->enc_param_set = OBJ_nid2obj(c->param_nid);

        len = i2d_GOST_CIPHER_PARAMS(gcp, NULL);
        p = buf = malloc(len);
        if (buf == NULL) {
                GOST_CIPHER_PARAMS_free(gcp);
                GOSTerror(ERR_R_MALLOC_FAILURE);
                return 0;
        }
        i2d_GOST_CIPHER_PARAMS(gcp, &p);
        GOST_CIPHER_PARAMS_free(gcp);

        os = ASN1_OCTET_STRING_new();
        if (os == NULL) {
                free(buf);
                GOSTerror(ERR_R_MALLOC_FAILURE);
                return 0;
        }
        if (ASN1_OCTET_STRING_set(os, buf, len) == 0) {
                ASN1_OCTET_STRING_free(os);
                free(buf);
                GOSTerror(ERR_R_ASN1_LIB);
                return 0;
        }
        free(buf);

        ASN1_TYPE_set(params, V_ASN1_SEQUENCE, os);
        return 1;
}

int
gost2814789_get_asn1_params(EVP_CIPHER_CTX *ctx, ASN1_TYPE *params)
{
        int ret = -1;
        int len;
        GOST_CIPHER_PARAMS *gcp = NULL;
        EVP_GOST2814789_CTX *c = ctx->cipher_data;
        unsigned char *p;

        if (ASN1_TYPE_get(params) != V_ASN1_SEQUENCE)
                return ret;

        p = params->value.sequence->data;

        gcp = d2i_GOST_CIPHER_PARAMS(NULL, (const unsigned char **)&p,
            params->value.sequence->length);

        len = gcp->iv->length;
        if (len != ctx->cipher->iv_len) {
                GOST_CIPHER_PARAMS_free(gcp);
                GOSTerror(GOST_R_INVALID_IV_LENGTH);
                return -1;
        }

        if (!Gost2814789_set_sbox(&c->ks, OBJ_obj2nid(gcp->enc_param_set))) {
                GOST_CIPHER_PARAMS_free(gcp);
                return -1;
        }
        c->param_nid = OBJ_obj2nid(gcp->enc_param_set);

        memcpy(ctx->oiv, gcp->iv->data, len);
        memcpy(ctx->iv, gcp->iv->data, len);

        GOST_CIPHER_PARAMS_free(gcp);

        return 1;
}

static int
gost2814789_ecb_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, const unsigned char *in, size_t inl)
{
        size_t i, bl;

        bl = ctx->cipher->block_size;

        if (inl < bl)
                return 1;

        inl -= bl;

        for (i = 0; i <= inl; i += bl)
                Gost2814789_ecb_encrypt(in + i, out + i, &((EVP_GOST2814789_CTX *)ctx->cipher_data)->ks, ctx->encrypt);

        return 1;
}

static int
gost2814789_cfb64_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out, const unsigned char *in, size_t inl)
{
        size_t chunk = EVP_MAXCHUNK;

        if (inl < chunk)
                chunk = inl;

        while (inl && inl >= chunk) {
                Gost2814789_cfb64_encrypt(in, out, chunk, &((EVP_GOST2814789_CTX *)ctx->cipher_data)->ks, ctx->iv, &ctx->num, ctx->encrypt);
                inl -= chunk;
                in += chunk;
                out += chunk;
                if (inl < chunk)
                        chunk = inl;
        }

        return 1;
}

static int
gost2814789_cnt_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
    const unsigned char *in, size_t inl)
{
        EVP_GOST2814789_CTX *c = ctx->cipher_data;

        while (inl >= EVP_MAXCHUNK) {
                Gost2814789_cnt_encrypt(in, out, EVP_MAXCHUNK, &c->ks,
                    ctx->iv, ctx->buf, &ctx->num);
                inl -= EVP_MAXCHUNK;
                in += EVP_MAXCHUNK;
                out += EVP_MAXCHUNK;
        }

        if (inl)
                Gost2814789_cnt_encrypt(in, out, inl, &c->ks, ctx->iv, ctx->buf,
                    &ctx->num);
        return 1;
}

/* gost89 is CFB-64 */
#define NID_gost89_cfb64 NID_id_Gost28147_89

static const EVP_CIPHER gost2814789_ecb = {
        .nid = NID_gost89_ecb,
        .block_size = 8,
        .key_len = 32,
        .iv_len = 0,
        .flags = EVP_CIPH_NO_PADDING | EVP_CIPH_CTRL_INIT | EVP_CIPH_ECB_MODE,
        .init = gost2814789_init_key,
        .do_cipher = gost2814789_ecb_cipher,
        .cleanup = NULL,
        .ctx_size = sizeof(EVP_GOST2814789_CTX),
        .set_asn1_parameters = gost2814789_set_asn1_params,
        .get_asn1_parameters = gost2814789_get_asn1_params,
        .ctrl = gost2814789_ctl,
        .app_data = NULL,
};

const EVP_CIPHER *
EVP_gost2814789_ecb(void)
{
        return &gost2814789_ecb;
}

static const EVP_CIPHER gost2814789_cfb64 = {
        .nid = NID_gost89_cfb64,
        .block_size = 1,
        .key_len = 32,
        .iv_len = 8,
        .flags = EVP_CIPH_NO_PADDING | EVP_CIPH_CTRL_INIT | EVP_CIPH_CFB_MODE,
        .init = gost2814789_init_key,
        .do_cipher = gost2814789_cfb64_cipher,
        .cleanup = NULL,
        .ctx_size = sizeof(EVP_GOST2814789_CTX),
        .set_asn1_parameters = gost2814789_set_asn1_params,
        .get_asn1_parameters = gost2814789_get_asn1_params,
        .ctrl = gost2814789_ctl,
        .app_data = NULL,
};

const EVP_CIPHER *
EVP_gost2814789_cfb64(void)
{
        return &gost2814789_cfb64;
}

static const EVP_CIPHER gost2814789_cnt = {
        .nid = NID_gost89_cnt,
        .block_size = 1,
        .key_len = 32,
        .iv_len = 8,
        .flags = EVP_CIPH_NO_PADDING | EVP_CIPH_CTRL_INIT | EVP_CIPH_OFB_MODE,
        .init = gost2814789_init_key,
        .do_cipher = gost2814789_cnt_cipher,
        .cleanup = NULL,
        .ctx_size = sizeof(EVP_GOST2814789_CTX),
        .set_asn1_parameters = gost2814789_set_asn1_params,
        .get_asn1_parameters = gost2814789_get_asn1_params,
        .ctrl = gost2814789_ctl,
        .app_data = NULL,
};

const EVP_CIPHER *
EVP_gost2814789_cnt(void)
{
        return &gost2814789_cnt;
}
#endif