/src/openssl/engines/ccgost/gost_crypt.c

Source (jump to first uncovered line)
/**********************************************************************
 *                          gost_crypt.c                              *
 *             Copyright (c) 2005-2006 Cryptocom LTD                  *
 *         This file is distributed under the same license as OpenSSL *
 *                                                                    *
 *       OpenSSL interface to GOST 28147-89 cipher functions          *
 *          Requires OpenSSL 0.9.9 for compilation                    *
 **********************************************************************/
#include <string.h>
#include "gost89.h"
#include <openssl/rand.h>
#include "e_gost_err.h"
#include "gost_lcl.h"

#if !defined(CCGOST_DEBUG) && !defined(DEBUG)
# ifndef NDEBUG
#  define NDEBUG
# endif
#endif
#include <assert.h>

static int gost_cipher_init(EVP_CIPHER_CTX *ctx, const unsigned char *key,
                            const unsigned char *iv, int enc);
static int gost_cipher_init_cpa(EVP_CIPHER_CTX *ctx, const unsigned char *key,
                                const unsigned char *iv, int enc);
/* Handles block of data in CFB mode */
static int gost_cipher_do_cfb(EVP_CIPHER_CTX *ctx, unsigned char *out,
                              const unsigned char *in, size_t inl);
/* Handles block of data in CNT mode */
static int gost_cipher_do_cnt(EVP_CIPHER_CTX *ctx, unsigned char *out,
                              const unsigned char *in, size_t inl);
/* Cleanup function */
static int gost_cipher_cleanup(EVP_CIPHER_CTX *);
/* set/get cipher parameters */
static int gost89_set_asn1_parameters(EVP_CIPHER_CTX *ctx, ASN1_TYPE *params);
static int gost89_get_asn1_parameters(EVP_CIPHER_CTX *ctx, ASN1_TYPE *params);
/* Control function */
static int gost_cipher_ctl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr);

EVP_CIPHER cipher_gost = {
    NID_id_Gost28147_89,
    1,                          /* block_size */
    32,                         /* key_size */
    8,                          /* iv_len */
    EVP_CIPH_CFB_MODE | EVP_CIPH_NO_PADDING |
        EVP_CIPH_CUSTOM_IV | EVP_CIPH_RAND_KEY | EVP_CIPH_ALWAYS_CALL_INIT,
    gost_cipher_init,
    gost_cipher_do_cfb,
    gost_cipher_cleanup,
    sizeof(struct ossl_gost_cipher_ctx), /* ctx_size */
    gost89_set_asn1_parameters,
    gost89_get_asn1_parameters,
    gost_cipher_ctl,
    NULL,
};

EVP_CIPHER cipher_gost_cpacnt = {
    NID_gost89_cnt,
    1,                          /* block_size */
    32,                         /* key_size */
    8,                          /* iv_len */
    EVP_CIPH_OFB_MODE | EVP_CIPH_NO_PADDING |
        EVP_CIPH_CUSTOM_IV | EVP_CIPH_RAND_KEY | EVP_CIPH_ALWAYS_CALL_INIT,
    gost_cipher_init_cpa,
    gost_cipher_do_cnt,
    gost_cipher_cleanup,
    sizeof(struct ossl_gost_cipher_ctx), /* ctx_size */
    gost89_set_asn1_parameters,
    gost89_get_asn1_parameters,
    gost_cipher_ctl,
    NULL,
};

/* Implementation of GOST 28147-89 in MAC (imitovstavka) mode */
/* Init functions which set specific parameters */
static int gost_imit_init_cpa(EVP_MD_CTX *ctx);
/* process block of data */
static int gost_imit_update(EVP_MD_CTX *ctx, const void *data, size_t count);
/* Return computed value */
static int gost_imit_final(EVP_MD_CTX *ctx, unsigned char *md);
/* Copies context */
static int gost_imit_copy(EVP_MD_CTX *to, const EVP_MD_CTX *from);
static int gost_imit_cleanup(EVP_MD_CTX *ctx);
/* Control function, knows how to set MAC key.*/
static int gost_imit_ctrl(EVP_MD_CTX *ctx, int type, int arg, void *ptr);

EVP_MD imit_gost_cpa = {
    NID_id_Gost28147_89_MAC,
    NID_undef,
    4,
    0,
    gost_imit_init_cpa,
    gost_imit_update,
    gost_imit_final,
    gost_imit_copy,
    gost_imit_cleanup,
    NULL,
    NULL,
    {0, 0, 0, 0, 0},
    8,
    sizeof(struct ossl_gost_imit_ctx),
    gost_imit_ctrl
};

/*
 * Correspondence between gost parameter OIDs and substitution blocks
 * NID field is filed by register_gost_NID function in engine.c
 * upon engine initialization
 */

struct gost_cipher_info gost_cipher_list[] = {
    /*- NID *//*
     * Subst block
     *//*
     * Key meshing
     */
    /*
     * {NID_id_GostR3411_94_CryptoProParamSet,&GostR3411_94_CryptoProParamSet,0},
     */
    {NID_id_Gost28147_89_cc, &GostR3411_94_CryptoProParamSet, 0},
    {NID_id_Gost28147_89_CryptoPro_A_ParamSet, &Gost28147_CryptoProParamSetA,
     1},
    {NID_id_Gost28147_89_CryptoPro_B_ParamSet, &Gost28147_CryptoProParamSetB,
     1},
    {NID_id_Gost28147_89_CryptoPro_C_ParamSet, &Gost28147_CryptoProParamSetC,
     1},
    {NID_id_Gost28147_89_CryptoPro_D_ParamSet, &Gost28147_CryptoProParamSetD,
     1},
    {NID_id_Gost28147_89_TestParamSet, &Gost28147_TestParamSet, 1},
    {NID_undef, NULL, 0}
};

/*
 * get encryption parameters from crypto network settings FIXME For now we
 * use environment var CRYPT_PARAMS as place to store these settings.
 * Actually, it is better to use engine control command, read from
 * configuration file to set them
 */
const struct gost_cipher_info *get_encryption_params(ASN1_OBJECT *obj)
{
    int nid;
    struct gost_cipher_info *param;
    if (!obj) {
        const char *params = get_gost_engine_param(GOST_PARAM_CRYPT_PARAMS);
        if (!params || !strlen(params))
            return &gost_cipher_list[1];

        nid = OBJ_txt2nid(params);
        if (nid == NID_undef) {
            GOSTerr(GOST_F_GET_ENCRYPTION_PARAMS,
                    GOST_R_INVALID_CIPHER_PARAM_OID);
            return NULL;
        }
    } else {
        nid = OBJ_obj2nid(obj);
    }
    for (param = gost_cipher_list; param->sblock != NULL && param->nid != nid;
         param++) ;
    if (!param->sblock) {
        GOSTerr(GOST_F_GET_ENCRYPTION_PARAMS, GOST_R_INVALID_CIPHER_PARAMS);
        return NULL;
    }
    return param;
}

/* Sets cipher param from paramset NID. */
static int gost_cipher_set_param(struct ossl_gost_cipher_ctx *c, int nid)
{
    const struct gost_cipher_info *param;
    param =
        get_encryption_params((nid == NID_undef ? NULL : OBJ_nid2obj(nid)));
    if (!param)
        return 0;

    c->paramNID = param->nid;
    c->key_meshing = param->key_meshing;
    c->count = 0;
    gost_init(&(c->cctx), param->sblock);
    return 1;
}

/* Initializes EVP_CIPHER_CTX by paramset NID */
static int gost_cipher_init_param(EVP_CIPHER_CTX *ctx,
                                  const unsigned char *key,
                                  const unsigned char *iv, int enc,
                                  int paramNID, int mode)
{
    struct ossl_gost_cipher_ctx *c = ctx->cipher_data;
    if (ctx->app_data == NULL) {
        if (!gost_cipher_set_param(c, paramNID))
            return 0;
        ctx->app_data = ctx->cipher_data;
    }
    if (key)
        gost_key(&(c->cctx), key);
    if (iv)
        memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx));
    memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx));
    return 1;
}

static int gost_cipher_init_cpa(EVP_CIPHER_CTX *ctx, const unsigned char *key,
                                const unsigned char *iv, int enc)
{
    struct ossl_gost_cipher_ctx *c = ctx->cipher_data;
    gost_init(&(c->cctx), &Gost28147_CryptoProParamSetA);
    c->key_meshing = 1;
    c->count = 0;
    if (key)
        gost_key(&(c->cctx), key);
    if (iv)
        memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx));
    memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx));
    return 1;
}

/* Initializes EVP_CIPHER_CTX with default values */
int gost_cipher_init(EVP_CIPHER_CTX *ctx, const unsigned char *key,
                     const unsigned char *iv, int enc)
{
    return gost_cipher_init_param(ctx, key, iv, enc, NID_undef,
                                  EVP_CIPH_CFB_MODE);
}

/*
 * Wrapper around gostcrypt function from gost89.c which perform key meshing
 * when nesseccary
 */
static void gost_crypt_mesh(void *ctx, unsigned char *iv, unsigned char *buf)
{
    struct ossl_gost_cipher_ctx *c = ctx;
    assert(c->count % 8 == 0 && c->count <= 1024);
    if (c->key_meshing && c->count == 1024) {
        cryptopro_key_meshing(&(c->cctx), iv);
    }
    gostcrypt(&(c->cctx), iv, buf);
    c->count = c->count % 1024 + 8;
}

static void gost_cnt_next(void *ctx, unsigned char *iv, unsigned char *buf)
{
    struct ossl_gost_cipher_ctx *c = ctx;
    word32 g, go;
    unsigned char buf1[8];
    assert(c->count % 8 == 0 && c->count <= 1024);
    if (c->key_meshing && c->count == 1024) {
        cryptopro_key_meshing(&(c->cctx), iv);
    }
    if (c->count == 0) {
        gostcrypt(&(c->cctx), iv, buf1);
    } else {
        memcpy(buf1, iv, 8);
    }
    g = buf1[0] | (buf1[1] << 8) | (buf1[2] << 16) | ((word32) buf1[3] << 24);
    g += 0x01010101;
    buf1[0] = (unsigned char)(g & 0xff);
    buf1[1] = (unsigned char)((g >> 8) & 0xff);
    buf1[2] = (unsigned char)((g >> 16) & 0xff);
    buf1[3] = (unsigned char)((g >> 24) & 0xff);
    g = buf1[4] | (buf1[5] << 8) | (buf1[6] << 16) | ((word32) buf1[7] << 24);
    go = g;
    g += 0x01010104;
    if (go > g)                 /* overflow */
        g++;
    buf1[4] = (unsigned char)(g & 0xff);
    buf1[5] = (unsigned char)((g >> 8) & 0xff);
    buf1[6] = (unsigned char)((g >> 16) & 0xff);
    buf1[7] = (unsigned char)((g >> 24) & 0xff);
    memcpy(iv, buf1, 8);
    gostcrypt(&(c->cctx), buf1, buf);
    c->count = c->count % 1024 + 8;
}

/* GOST encryption in CFB mode */
int gost_cipher_do_cfb(EVP_CIPHER_CTX *ctx, unsigned char *out,
                       const unsigned char *in, size_t inl)
{
    const unsigned char *in_ptr = in;
    unsigned char *out_ptr = out;
    size_t i = 0;
    size_t j = 0;
/* process partial block if any */
    if (ctx->num) {
        for (j = ctx->num, i = 0; j < 8 && i < inl;
             j++, i++, in_ptr++, out_ptr++) {
            if (!ctx->encrypt)
                ctx->buf[j + 8] = *in_ptr;
            *out_ptr = ctx->buf[j] ^ (*in_ptr);
            if (ctx->encrypt)
                ctx->buf[j + 8] = *out_ptr;
        }
        if (j == 8) {
            memcpy(ctx->iv, ctx->buf + 8, 8);
            ctx->num = 0;
        } else {
            ctx->num = j;
            return 1;
        }
    }

    for (; i + 8 < inl; i += 8, in_ptr += 8, out_ptr += 8) {
        /*
         * block cipher current iv
         */
        gost_crypt_mesh(ctx->cipher_data, ctx->iv, ctx->buf);
        /*
         * xor next block of input text with it and output it
         */
        /*
         * output this block
         */
        if (!ctx->encrypt)
            memcpy(ctx->iv, in_ptr, 8);
        for (j = 0; j < 8; j++) {
            out_ptr[j] = ctx->buf[j] ^ in_ptr[j];
        }
        /* Encrypt */
        /* Next iv is next block of cipher text */
        if (ctx->encrypt)
            memcpy(ctx->iv, out_ptr, 8);
    }
/* Process rest of buffer */
    if (i < inl) {
        gost_crypt_mesh(ctx->cipher_data, ctx->iv, ctx->buf);
        if (!ctx->encrypt)
            memcpy(ctx->buf + 8, in_ptr, inl - i);
        for (j = 0; i < inl; j++, i++) {
            out_ptr[j] = ctx->buf[j] ^ in_ptr[j];
        }
        ctx->num = j;
        if (ctx->encrypt)
            memcpy(ctx->buf + 8, out_ptr, j);
    } else {
        ctx->num = 0;
    }
    return 1;
}

static int gost_cipher_do_cnt(EVP_CIPHER_CTX *ctx, unsigned char *out,
                              const unsigned char *in, size_t inl)
{
    const unsigned char *in_ptr = in;
    unsigned char *out_ptr = out;
    size_t i = 0;
    size_t j;
/* process partial block if any */
    if (ctx->num) {
        for (j = ctx->num, i = 0; j < 8 && i < inl;
             j++, i++, in_ptr++, out_ptr++) {
            *out_ptr = ctx->buf[j] ^ (*in_ptr);
        }
        if (j == 8) {
            ctx->num = 0;
        } else {
            ctx->num = j;
            return 1;
        }
    }

    for (; i + 8 < inl; i += 8, in_ptr += 8, out_ptr += 8) {
        /*
         * block cipher current iv
         */
        /* Encrypt */
        gost_cnt_next(ctx->cipher_data, ctx->iv, ctx->buf);
        /*
         * xor next block of input text with it and output it
         */
        /*
         * output this block
         */
        for (j = 0; j < 8; j++) {
            out_ptr[j] = ctx->buf[j] ^ in_ptr[j];
        }
    }
/* Process rest of buffer */
    if (i < inl) {
        gost_cnt_next(ctx->cipher_data, ctx->iv, ctx->buf);
        for (j = 0; i < inl; j++, i++) {
            out_ptr[j] = ctx->buf[j] ^ in_ptr[j];
        }
        ctx->num = j;
    } else {
        ctx->num = 0;
    }
    return 1;
}

/* Cleaning up of EVP_CIPHER_CTX */
int gost_cipher_cleanup(EVP_CIPHER_CTX *ctx)
{
    gost_destroy(&((struct ossl_gost_cipher_ctx *)ctx->cipher_data)->cctx);
    ctx->app_data = NULL;
    return 1;
}

/* Control function for gost cipher */
int gost_cipher_ctl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr)
{
    switch (type) {
    case EVP_CTRL_RAND_KEY:
        {
            if (RAND_bytes((unsigned char *)ptr, ctx->key_len) <= 0) {
                GOSTerr(GOST_F_GOST_CIPHER_CTL,
                        GOST_R_RANDOM_GENERATOR_ERROR);
                return -1;
            }
            break;
        }
    case EVP_CTRL_PBE_PRF_NID:
        if (ptr) {
            *((int *)ptr) = NID_id_HMACGostR3411_94;
            return 1;
        } else {
            return 0;
        }

    default:
        GOSTerr(GOST_F_GOST_CIPHER_CTL,
                GOST_R_UNSUPPORTED_CIPHER_CTL_COMMAND);
        return -1;
    }
    return 1;
}

/* Set cipher parameters from ASN1 structure */
int gost89_set_asn1_parameters(EVP_CIPHER_CTX *ctx, ASN1_TYPE *params)
{
    int len = 0;
    unsigned char *buf = NULL;
    unsigned char *p = NULL;
    struct ossl_gost_cipher_ctx *c = ctx->cipher_data;
    GOST_CIPHER_PARAMS *gcp = GOST_CIPHER_PARAMS_new();
    ASN1_OCTET_STRING *os = NULL;
    if (!gcp) {
        GOSTerr(GOST_F_GOST89_SET_ASN1_PARAMETERS, GOST_R_NO_MEMORY);
        return 0;
    }
    if (!ASN1_OCTET_STRING_set(gcp->iv, ctx->iv, ctx->cipher->iv_len)) {
        GOST_CIPHER_PARAMS_free(gcp);
        GOSTerr(GOST_F_GOST89_SET_ASN1_PARAMETERS, GOST_R_NO_MEMORY);
        return 0;
    }
    ASN1_OBJECT_free(gcp->enc_param_set);
    gcp->enc_param_set = OBJ_nid2obj(c->paramNID);

    len = i2d_GOST_CIPHER_PARAMS(gcp, NULL);
    p = buf = (unsigned char *)OPENSSL_malloc(len);
    if (!buf) {
        GOST_CIPHER_PARAMS_free(gcp);
        GOSTerr(GOST_F_GOST89_SET_ASN1_PARAMETERS, GOST_R_NO_MEMORY);
        return 0;
    }
    i2d_GOST_CIPHER_PARAMS(gcp, &p);
    GOST_CIPHER_PARAMS_free(gcp);

    os = ASN1_OCTET_STRING_new();

    if (!os || !ASN1_OCTET_STRING_set(os, buf, len)) {
        OPENSSL_free(buf);
        GOSTerr(GOST_F_GOST89_SET_ASN1_PARAMETERS, GOST_R_NO_MEMORY);
        return 0;
    }
    OPENSSL_free(buf);

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

/* Store parameters into ASN1 structure */
int gost89_get_asn1_parameters(EVP_CIPHER_CTX *ctx, ASN1_TYPE *params)
{
    int ret = -1;
    int len;
    GOST_CIPHER_PARAMS *gcp = NULL;
    unsigned char *p;
    struct ossl_gost_cipher_ctx *c = ctx->cipher_data;
    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);
        GOSTerr(GOST_F_GOST89_GET_ASN1_PARAMETERS, GOST_R_INVALID_IV_LENGTH);
        return -1;
    }
    if (!gost_cipher_set_param(c, OBJ_obj2nid(gcp->enc_param_set))) {
        GOST_CIPHER_PARAMS_free(gcp);
        return -1;
    }
    memcpy(ctx->oiv, gcp->iv->data, len);

    GOST_CIPHER_PARAMS_free(gcp);

    return 1;
}

int gost_imit_init_cpa(EVP_MD_CTX *ctx)
{
    struct ossl_gost_imit_ctx *c = ctx->md_data;
    memset(c->buffer, 0, sizeof(c->buffer));
    memset(c->partial_block, 0, sizeof(c->partial_block));
    c->count = 0;
    c->bytes_left = 0;
    c->key_meshing = 1;
    gost_init(&(c->cctx), &Gost28147_CryptoProParamSetA);
    return 1;
}

static void mac_block_mesh(struct ossl_gost_imit_ctx *c,
                           const unsigned char *data)
{
    unsigned char buffer[8];
    /*
     * We are using local buffer for iv because CryptoPro doesn't interpret
     * internal state of MAC algorithm as iv during keymeshing (but does
     * initialize internal state from iv in key transport
     */
    assert(c->count % 8 == 0 && c->count <= 1024);
    if (c->key_meshing && c->count == 1024) {
        cryptopro_key_meshing(&(c->cctx), buffer);
    }
    mac_block(&(c->cctx), c->buffer, data);
    c->count = c->count % 1024 + 8;
}

int gost_imit_update(EVP_MD_CTX *ctx, const void *data, size_t count)
{
    struct ossl_gost_imit_ctx *c = ctx->md_data;
    const unsigned char *p = data;
    size_t bytes = count, i;
    if (!(c->key_set)) {
        GOSTerr(GOST_F_GOST_IMIT_UPDATE, GOST_R_MAC_KEY_NOT_SET);
        return 0;
    }
    if (c->bytes_left) {
        for (i = c->bytes_left; i < 8 && bytes > 0; bytes--, i++, p++) {
            c->partial_block[i] = *p;
        }
        if (i == 8) {
            mac_block_mesh(c, c->partial_block);
        } else {
            c->bytes_left = i;
            return 1;
        }
    }
    while (bytes > 8) {
        mac_block_mesh(c, p);
        p += 8;
        bytes -= 8;
    }
    if (bytes > 0) {
        memcpy(c->partial_block, p, bytes);
    }
    c->bytes_left = bytes;
    return 1;
}

int gost_imit_final(EVP_MD_CTX *ctx, unsigned char *md)
{
    struct ossl_gost_imit_ctx *c = ctx->md_data;
    if (!c->key_set) {
        GOSTerr(GOST_F_GOST_IMIT_FINAL, GOST_R_MAC_KEY_NOT_SET);
        return 0;
    }
    if (c->count == 0 && c->bytes_left) {
        unsigned char buffer[8];
        memset(buffer, 0, 8);
        gost_imit_update(ctx, buffer, 8);
    }
    if (c->bytes_left) {
        int i;
        for (i = c->bytes_left; i < 8; i++) {
            c->partial_block[i] = 0;
        }
        mac_block_mesh(c, c->partial_block);
    }
    get_mac(c->buffer, 32, md);
    return 1;
}

int gost_imit_ctrl(EVP_MD_CTX *ctx, int type, int arg, void *ptr)
{
    switch (type) {
    case EVP_MD_CTRL_KEY_LEN:
        *((unsigned int *)(ptr)) = 32;
        return 1;
    case EVP_MD_CTRL_SET_KEY:
        {
            if (arg != 32) {
                GOSTerr(GOST_F_GOST_IMIT_CTRL, GOST_R_INVALID_MAC_KEY_LENGTH);
                return 0;
            }

            gost_key(&(((struct ossl_gost_imit_ctx *)(ctx->md_data))->cctx),
                     ptr);
            ((struct ossl_gost_imit_ctx *)(ctx->md_data))->key_set = 1;
            return 1;

        }
    default:
        return 0;
    }
}

int gost_imit_copy(EVP_MD_CTX *to, const EVP_MD_CTX *from)
{
    memcpy(to->md_data, from->md_data, sizeof(struct ossl_gost_imit_ctx));
    return 1;
}

/* Clean up imit ctx */
int gost_imit_cleanup(EVP_MD_CTX *ctx)
{
    memset(ctx->md_data, 0, sizeof(struct ossl_gost_imit_ctx));
    return 1;
}

Coverage Report

Created: 2022-11-30 06:20

Line	Count	Source (jump to first uncovered line)
1		/**********************************************************************
2		* gost_crypt.c *
3		* Copyright (c) 2005-2006 Cryptocom LTD *
4		* This file is distributed under the same license as OpenSSL *
5		* *
6		* OpenSSL interface to GOST 28147-89 cipher functions *
7		* Requires OpenSSL 0.9.9 for compilation *
8		**********************************************************************/
9		#include <string.h>
10		#include "gost89.h"
11		#include <openssl/rand.h>
12		#include "e_gost_err.h"
13		#include "gost_lcl.h"
14
15		#if !defined(CCGOST_DEBUG) && !defined(DEBUG)
16		# ifndef NDEBUG
17		# define NDEBUG
18		# endif
19		#endif
20		#include <assert.h>
21
22		static int gost_cipher_init(EVP_CIPHER_CTX ctx, const unsigned char key,
23		const unsigned char *iv, int enc);
24		static int gost_cipher_init_cpa(EVP_CIPHER_CTX ctx, const unsigned char key,
25		const unsigned char *iv, int enc);
26		/* Handles block of data in CFB mode */
27		static int gost_cipher_do_cfb(EVP_CIPHER_CTX ctx, unsigned char out,
28		const unsigned char *in, size_t inl);
29		/* Handles block of data in CNT mode */
30		static int gost_cipher_do_cnt(EVP_CIPHER_CTX ctx, unsigned char out,
31		const unsigned char *in, size_t inl);
32		/* Cleanup function */
33		static int gost_cipher_cleanup(EVP_CIPHER_CTX *);
34		/* set/get cipher parameters */
35		static int gost89_set_asn1_parameters(EVP_CIPHER_CTX ctx, ASN1_TYPE params);
36		static int gost89_get_asn1_parameters(EVP_CIPHER_CTX ctx, ASN1_TYPE params);
37		/* Control function */
38		static int gost_cipher_ctl(EVP_CIPHER_CTX ctx, int type, int arg, void ptr);
39
40		EVP_CIPHER cipher_gost = {
41		NID_id_Gost28147_89,
42		1, /* block_size */
43		32, /* key_size */
44		8, /* iv_len */
45		EVP_CIPH_CFB_MODE \| EVP_CIPH_NO_PADDING \|
46		EVP_CIPH_CUSTOM_IV \| EVP_CIPH_RAND_KEY \| EVP_CIPH_ALWAYS_CALL_INIT,
47		gost_cipher_init,
48		gost_cipher_do_cfb,
49		gost_cipher_cleanup,
50		sizeof(struct ossl_gost_cipher_ctx), /* ctx_size */
51		gost89_set_asn1_parameters,
52		gost89_get_asn1_parameters,
53		gost_cipher_ctl,
54		NULL,
55		};
56
57		EVP_CIPHER cipher_gost_cpacnt = {
58		NID_gost89_cnt,
59		1, /* block_size */
60		32, /* key_size */
61		8, /* iv_len */
62		EVP_CIPH_OFB_MODE \| EVP_CIPH_NO_PADDING \|
63		EVP_CIPH_CUSTOM_IV \| EVP_CIPH_RAND_KEY \| EVP_CIPH_ALWAYS_CALL_INIT,
64		gost_cipher_init_cpa,
65		gost_cipher_do_cnt,
66		gost_cipher_cleanup,
67		sizeof(struct ossl_gost_cipher_ctx), /* ctx_size */
68		gost89_set_asn1_parameters,
69		gost89_get_asn1_parameters,
70		gost_cipher_ctl,
71		NULL,
72		};
73
74		/* Implementation of GOST 28147-89 in MAC (imitovstavka) mode */
75		/* Init functions which set specific parameters */
76		static int gost_imit_init_cpa(EVP_MD_CTX *ctx);
77		/* process block of data */
78		static int gost_imit_update(EVP_MD_CTX ctx, const void data, size_t count);
79		/* Return computed value */
80		static int gost_imit_final(EVP_MD_CTX ctx, unsigned char md);
81		/* Copies context */
82		static int gost_imit_copy(EVP_MD_CTX to, const EVP_MD_CTX from);
83		static int gost_imit_cleanup(EVP_MD_CTX *ctx);
84		/* Control function, knows how to set MAC key.*/
85		static int gost_imit_ctrl(EVP_MD_CTX ctx, int type, int arg, void ptr);
86
87		EVP_MD imit_gost_cpa = {
88		NID_id_Gost28147_89_MAC,
89		NID_undef,
90		4,
91		0,
92		gost_imit_init_cpa,
93		gost_imit_update,
94		gost_imit_final,
95		gost_imit_copy,
96		gost_imit_cleanup,
97		NULL,
98		NULL,
99		{0, 0, 0, 0, 0},
100		8,
101		sizeof(struct ossl_gost_imit_ctx),
102		gost_imit_ctrl
103		};
104
105		/*
106		* Correspondence between gost parameter OIDs and substitution blocks
107		* NID field is filed by register_gost_NID function in engine.c
108		* upon engine initialization
109		*/
110
111		struct gost_cipher_info gost_cipher_list[] = {
112		/- NID //*
113		* Subst block
114		//
115		* Key meshing
116		*/
117		/*
118		* {NID_id_GostR3411_94_CryptoProParamSet,&GostR3411_94_CryptoProParamSet,0},
119		*/
120		{NID_id_Gost28147_89_cc, &GostR3411_94_CryptoProParamSet, 0},
121		{NID_id_Gost28147_89_CryptoPro_A_ParamSet, &Gost28147_CryptoProParamSetA,
122		1},
123		{NID_id_Gost28147_89_CryptoPro_B_ParamSet, &Gost28147_CryptoProParamSetB,
124		1},
125		{NID_id_Gost28147_89_CryptoPro_C_ParamSet, &Gost28147_CryptoProParamSetC,
126		1},
127		{NID_id_Gost28147_89_CryptoPro_D_ParamSet, &Gost28147_CryptoProParamSetD,
128		1},
129		{NID_id_Gost28147_89_TestParamSet, &Gost28147_TestParamSet, 1},
130		{NID_undef, NULL, 0}
131		};
132
133		/*
134		* get encryption parameters from crypto network settings FIXME For now we
135		* use environment var CRYPT_PARAMS as place to store these settings.
136		* Actually, it is better to use engine control command, read from
137		* configuration file to set them
138		*/
139		const struct gost_cipher_info get_encryption_params(ASN1_OBJECT obj)
140	0	{
141	0	int nid;
142	0	struct gost_cipher_info *param;
143	0	if (!obj) {
144	0	const char *params = get_gost_engine_param(GOST_PARAM_CRYPT_PARAMS);
145	0	if (!params \|\| !strlen(params))
146	0	return &gost_cipher_list[1];
147
148	0	nid = OBJ_txt2nid(params);
149	0	if (nid == NID_undef) {
150	0	GOSTerr(GOST_F_GET_ENCRYPTION_PARAMS,
151	0	GOST_R_INVALID_CIPHER_PARAM_OID);
152	0	return NULL;
153	0	}
154	0	} else {
155	0	nid = OBJ_obj2nid(obj);
156	0	}
157	0	for (param = gost_cipher_list; param->sblock != NULL && param->nid != nid;
158	0	param++) ;
159	0	if (!param->sblock) {
160	0	GOSTerr(GOST_F_GET_ENCRYPTION_PARAMS, GOST_R_INVALID_CIPHER_PARAMS);
161	0	return NULL;
162	0	}
163	0	return param;
164	0	}
165
166		/* Sets cipher param from paramset NID. */
167		static int gost_cipher_set_param(struct ossl_gost_cipher_ctx *c, int nid)
168	0	{
169	0	const struct gost_cipher_info *param;
170	0	param =
171	0	get_encryption_params((nid == NID_undef ? NULL : OBJ_nid2obj(nid)));
172	0	if (!param)
173	0	return 0;
174
175	0	c->paramNID = param->nid;
176	0	c->key_meshing = param->key_meshing;
177	0	c->count = 0;
178	0	gost_init(&(c->cctx), param->sblock);
179	0	return 1;
180	0	}
181
182		/* Initializes EVP_CIPHER_CTX by paramset NID */
183		static int gost_cipher_init_param(EVP_CIPHER_CTX *ctx,
184		const unsigned char *key,
185		const unsigned char *iv, int enc,
186		int paramNID, int mode)
187	0	{
188	0	struct ossl_gost_cipher_ctx *c = ctx->cipher_data;
189	0	if (ctx->app_data == NULL) {
190	0	if (!gost_cipher_set_param(c, paramNID))
191	0	return 0;
192	0	ctx->app_data = ctx->cipher_data;
193	0	}
194	0	if (key)
195	0	gost_key(&(c->cctx), key);
196	0	if (iv)
197	0	memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx));
198	0	memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx));
199	0	return 1;
200	0	}
201
202		static int gost_cipher_init_cpa(EVP_CIPHER_CTX ctx, const unsigned char key,
203		const unsigned char *iv, int enc)
204	0	{
205	0	struct ossl_gost_cipher_ctx *c = ctx->cipher_data;
206	0	gost_init(&(c->cctx), &Gost28147_CryptoProParamSetA);
207	0	c->key_meshing = 1;
208	0	c->count = 0;
209	0	if (key)
210	0	gost_key(&(c->cctx), key);
211	0	if (iv)
212	0	memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx));
213	0	memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx));
214	0	return 1;
215	0	}
216
217		/* Initializes EVP_CIPHER_CTX with default values */
218		int gost_cipher_init(EVP_CIPHER_CTX ctx, const unsigned char key,
219		const unsigned char *iv, int enc)
220	0	{
221	0	return gost_cipher_init_param(ctx, key, iv, enc, NID_undef,
222	0	EVP_CIPH_CFB_MODE);
223	0	}
224
225		/*
226		* Wrapper around gostcrypt function from gost89.c which perform key meshing
227		* when nesseccary
228		*/
229		static void gost_crypt_mesh(void ctx, unsigned char iv, unsigned char *buf)
230	0	{
231	0	struct ossl_gost_cipher_ctx *c = ctx;
232	0	assert(c->count % 8 == 0 && c->count <= 1024);
233	0	if (c->key_meshing && c->count == 1024) {
234	0	cryptopro_key_meshing(&(c->cctx), iv);
235	0	}
236	0	gostcrypt(&(c->cctx), iv, buf);
237	0	c->count = c->count % 1024 + 8;
238	0	}
239
240		static void gost_cnt_next(void ctx, unsigned char iv, unsigned char *buf)
241	0	{
242	0	struct ossl_gost_cipher_ctx *c = ctx;
243	0	word32 g, go;
244	0	unsigned char buf1[8];
245	0	assert(c->count % 8 == 0 && c->count <= 1024);
246	0	if (c->key_meshing && c->count == 1024) {
247	0	cryptopro_key_meshing(&(c->cctx), iv);
248	0	}
249	0	if (c->count == 0) {
250	0	gostcrypt(&(c->cctx), iv, buf1);
251	0	} else {
252	0	memcpy(buf1, iv, 8);
253	0	}
254	0	g = buf1[0] \| (buf1[1] << 8) \| (buf1[2] << 16) \| ((word32) buf1[3] << 24);
255	0	g += 0x01010101;
256	0	buf1[0] = (unsigned char)(g & 0xff);
257	0	buf1[1] = (unsigned char)((g >> 8) & 0xff);
258	0	buf1[2] = (unsigned char)((g >> 16) & 0xff);
259	0	buf1[3] = (unsigned char)((g >> 24) & 0xff);
260	0	g = buf1[4] \| (buf1[5] << 8) \| (buf1[6] << 16) \| ((word32) buf1[7] << 24);
261	0	go = g;
262	0	g += 0x01010104;
263	0	if (go > g) /* overflow */
264	0	g++;
265	0	buf1[4] = (unsigned char)(g & 0xff);
266	0	buf1[5] = (unsigned char)((g >> 8) & 0xff);
267	0	buf1[6] = (unsigned char)((g >> 16) & 0xff);
268	0	buf1[7] = (unsigned char)((g >> 24) & 0xff);
269	0	memcpy(iv, buf1, 8);
270	0	gostcrypt(&(c->cctx), buf1, buf);
271	0	c->count = c->count % 1024 + 8;
272	0	}
273
274		/* GOST encryption in CFB mode */
275		int gost_cipher_do_cfb(EVP_CIPHER_CTX ctx, unsigned char out,
276		const unsigned char *in, size_t inl)
277	0	{
278	0	const unsigned char *in_ptr = in;
279	0	unsigned char *out_ptr = out;
280	0	size_t i = 0;
281	0	size_t j = 0;
282		/* process partial block if any */
283	0	if (ctx->num) {
284	0	for (j = ctx->num, i = 0; j < 8 && i < inl;
285	0	j++, i++, in_ptr++, out_ptr++) {
286	0	if (!ctx->encrypt)
287	0	ctx->buf[j + 8] = *in_ptr;
288	0	out_ptr = ctx->buf[j] ^ (in_ptr);
289	0	if (ctx->encrypt)
290	0	ctx->buf[j + 8] = *out_ptr;
291	0	}
292	0	if (j == 8) {
293	0	memcpy(ctx->iv, ctx->buf + 8, 8);
294	0	ctx->num = 0;
295	0	} else {
296	0	ctx->num = j;
297	0	return 1;
298	0	}
299	0	}
300
301	0	for (; i + 8 < inl; i += 8, in_ptr += 8, out_ptr += 8) {
302		/*
303		* block cipher current iv
304		*/
305	0	gost_crypt_mesh(ctx->cipher_data, ctx->iv, ctx->buf);
306		/*
307		* xor next block of input text with it and output it
308		*/
309		/*
310		* output this block
311		*/
312	0	if (!ctx->encrypt)
313	0	memcpy(ctx->iv, in_ptr, 8);
314	0	for (j = 0; j < 8; j++) {
315	0	out_ptr[j] = ctx->buf[j] ^ in_ptr[j];
316	0	}
317		/* Encrypt */
318		/* Next iv is next block of cipher text */
319	0	if (ctx->encrypt)
320	0	memcpy(ctx->iv, out_ptr, 8);
321	0	}
322		/* Process rest of buffer */
323	0	if (i < inl) {
324	0	gost_crypt_mesh(ctx->cipher_data, ctx->iv, ctx->buf);
325	0	if (!ctx->encrypt)
326	0	memcpy(ctx->buf + 8, in_ptr, inl - i);
327	0	for (j = 0; i < inl; j++, i++) {
328	0	out_ptr[j] = ctx->buf[j] ^ in_ptr[j];
329	0	}
330	0	ctx->num = j;
331	0	if (ctx->encrypt)
332	0	memcpy(ctx->buf + 8, out_ptr, j);
333	0	} else {
334	0	ctx->num = 0;
335	0	}
336	0	return 1;
337	0	}
338
339		static int gost_cipher_do_cnt(EVP_CIPHER_CTX ctx, unsigned char out,
340		const unsigned char *in, size_t inl)
341	0	{
342	0	const unsigned char *in_ptr = in;
343	0	unsigned char *out_ptr = out;
344	0	size_t i = 0;
345	0	size_t j;
346		/* process partial block if any */
347	0	if (ctx->num) {
348	0	for (j = ctx->num, i = 0; j < 8 && i < inl;
349	0	j++, i++, in_ptr++, out_ptr++) {
350	0	out_ptr = ctx->buf[j] ^ (in_ptr);
351	0	}
352	0	if (j == 8) {
353	0	ctx->num = 0;
354	0	} else {
355	0	ctx->num = j;
356	0	return 1;
357	0	}
358	0	}
359
360	0	for (; i + 8 < inl; i += 8, in_ptr += 8, out_ptr += 8) {
361		/*
362		* block cipher current iv
363		*/
364		/* Encrypt */
365	0	gost_cnt_next(ctx->cipher_data, ctx->iv, ctx->buf);
366		/*
367		* xor next block of input text with it and output it
368		*/
369		/*
370		* output this block
371		*/
372	0	for (j = 0; j < 8; j++) {
373	0	out_ptr[j] = ctx->buf[j] ^ in_ptr[j];
374	0	}
375	0	}
376		/* Process rest of buffer */
377	0	if (i < inl) {
378	0	gost_cnt_next(ctx->cipher_data, ctx->iv, ctx->buf);
379	0	for (j = 0; i < inl; j++, i++) {
380	0	out_ptr[j] = ctx->buf[j] ^ in_ptr[j];
381	0	}
382	0	ctx->num = j;
383	0	} else {
384	0	ctx->num = 0;
385	0	}
386	0	return 1;
387	0	}
388
389		/* Cleaning up of EVP_CIPHER_CTX */
390		int gost_cipher_cleanup(EVP_CIPHER_CTX *ctx)
391	0	{
392	0	gost_destroy(&((struct ossl_gost_cipher_ctx *)ctx->cipher_data)->cctx);
393	0	ctx->app_data = NULL;
394	0	return 1;
395	0	}
396
397		/* Control function for gost cipher */
398		int gost_cipher_ctl(EVP_CIPHER_CTX ctx, int type, int arg, void ptr)
399	0	{
400	0	switch (type) {
401	0	case EVP_CTRL_RAND_KEY:
402	0	{
403	0	if (RAND_bytes((unsigned char *)ptr, ctx->key_len) <= 0) {
404	0	GOSTerr(GOST_F_GOST_CIPHER_CTL,
405	0	GOST_R_RANDOM_GENERATOR_ERROR);
406	0	return -1;
407	0	}
408	0	break;
409	0	}
410	0	case EVP_CTRL_PBE_PRF_NID:
411	0	if (ptr) {
412	0	((int )ptr) = NID_id_HMACGostR3411_94;
413	0	return 1;
414	0	} else {
415	0	return 0;
416	0	}
417
418	0	default:
419	0	GOSTerr(GOST_F_GOST_CIPHER_CTL,
420	0	GOST_R_UNSUPPORTED_CIPHER_CTL_COMMAND);
421	0	return -1;
422	0	}
423	0	return 1;
424	0	}
425
426		/* Set cipher parameters from ASN1 structure */
427		int gost89_set_asn1_parameters(EVP_CIPHER_CTX ctx, ASN1_TYPE params)
428	0	{
429	0	int len = 0;
430	0	unsigned char *buf = NULL;
431	0	unsigned char *p = NULL;
432	0	struct ossl_gost_cipher_ctx *c = ctx->cipher_data;
433	0	GOST_CIPHER_PARAMS *gcp = GOST_CIPHER_PARAMS_new();
434	0	ASN1_OCTET_STRING *os = NULL;
435	0	if (!gcp) {
436	0	GOSTerr(GOST_F_GOST89_SET_ASN1_PARAMETERS, GOST_R_NO_MEMORY);
437	0	return 0;
438	0	}
439	0	if (!ASN1_OCTET_STRING_set(gcp->iv, ctx->iv, ctx->cipher->iv_len)) {
440	0	GOST_CIPHER_PARAMS_free(gcp);
441	0	GOSTerr(GOST_F_GOST89_SET_ASN1_PARAMETERS, GOST_R_NO_MEMORY);
442	0	return 0;
443	0	}
444	0	ASN1_OBJECT_free(gcp->enc_param_set);
445	0	gcp->enc_param_set = OBJ_nid2obj(c->paramNID);
446
447	0	len = i2d_GOST_CIPHER_PARAMS(gcp, NULL);
448	0	p = buf = (unsigned char *)OPENSSL_malloc(len);
449	0	if (!buf) {
450	0	GOST_CIPHER_PARAMS_free(gcp);
451	0	GOSTerr(GOST_F_GOST89_SET_ASN1_PARAMETERS, GOST_R_NO_MEMORY);
452	0	return 0;
453	0	}
454	0	i2d_GOST_CIPHER_PARAMS(gcp, &p);
455	0	GOST_CIPHER_PARAMS_free(gcp);
456
457	0	os = ASN1_OCTET_STRING_new();
458
459	0	if (!os \|\| !ASN1_OCTET_STRING_set(os, buf, len)) {
460	0	OPENSSL_free(buf);
461	0	GOSTerr(GOST_F_GOST89_SET_ASN1_PARAMETERS, GOST_R_NO_MEMORY);
462	0	return 0;
463	0	}
464	0	OPENSSL_free(buf);
465
466	0	ASN1_TYPE_set(params, V_ASN1_SEQUENCE, os);
467	0	return 1;
468	0	}
469
470		/* Store parameters into ASN1 structure */
471		int gost89_get_asn1_parameters(EVP_CIPHER_CTX ctx, ASN1_TYPE params)
472	0	{
473	0	int ret = -1;
474	0	int len;
475	0	GOST_CIPHER_PARAMS *gcp = NULL;
476	0	unsigned char *p;
477	0	struct ossl_gost_cipher_ctx *c = ctx->cipher_data;
478	0	if (ASN1_TYPE_get(params) != V_ASN1_SEQUENCE) {
479	0	return ret;
480	0	}
481
482	0	p = params->value.sequence->data;
483
484	0	gcp = d2i_GOST_CIPHER_PARAMS(NULL, (const unsigned char **)&p,
485	0	params->value.sequence->length);
486
487	0	len = gcp->iv->length;
488	0	if (len != ctx->cipher->iv_len) {
489	0	GOST_CIPHER_PARAMS_free(gcp);
490	0	GOSTerr(GOST_F_GOST89_GET_ASN1_PARAMETERS, GOST_R_INVALID_IV_LENGTH);
491	0	return -1;
492	0	}
493	0	if (!gost_cipher_set_param(c, OBJ_obj2nid(gcp->enc_param_set))) {
494	0	GOST_CIPHER_PARAMS_free(gcp);
495	0	return -1;
496	0	}
497	0	memcpy(ctx->oiv, gcp->iv->data, len);
498
499	0	GOST_CIPHER_PARAMS_free(gcp);
500
501	0	return 1;
502	0	}
503
504		int gost_imit_init_cpa(EVP_MD_CTX *ctx)
505	0	{
506	0	struct ossl_gost_imit_ctx *c = ctx->md_data;
507	0	memset(c->buffer, 0, sizeof(c->buffer));
508	0	memset(c->partial_block, 0, sizeof(c->partial_block));
509	0	c->count = 0;
510	0	c->bytes_left = 0;
511	0	c->key_meshing = 1;
512	0	gost_init(&(c->cctx), &Gost28147_CryptoProParamSetA);
513	0	return 1;
514	0	}
515
516		static void mac_block_mesh(struct ossl_gost_imit_ctx *c,
517		const unsigned char *data)
518	0	{
519	0	unsigned char buffer[8];
520		/*
521		* We are using local buffer for iv because CryptoPro doesn't interpret
522		* internal state of MAC algorithm as iv during keymeshing (but does
523		* initialize internal state from iv in key transport
524		*/
525	0	assert(c->count % 8 == 0 && c->count <= 1024);
526	0	if (c->key_meshing && c->count == 1024) {
527	0	cryptopro_key_meshing(&(c->cctx), buffer);
528	0	}
529	0	mac_block(&(c->cctx), c->buffer, data);
530	0	c->count = c->count % 1024 + 8;
531	0	}
532
533		int gost_imit_update(EVP_MD_CTX ctx, const void data, size_t count)
534	0	{
535	0	struct ossl_gost_imit_ctx *c = ctx->md_data;
536	0	const unsigned char *p = data;
537	0	size_t bytes = count, i;
538	0	if (!(c->key_set)) {
539	0	GOSTerr(GOST_F_GOST_IMIT_UPDATE, GOST_R_MAC_KEY_NOT_SET);
540	0	return 0;
541	0	}
542	0	if (c->bytes_left) {
543	0	for (i = c->bytes_left; i < 8 && bytes > 0; bytes--, i++, p++) {
544	0	c->partial_block[i] = *p;
545	0	}
546	0	if (i == 8) {
547	0	mac_block_mesh(c, c->partial_block);
548	0	} else {
549	0	c->bytes_left = i;
550	0	return 1;
551	0	}
552	0	}
553	0	while (bytes > 8) {
554	0	mac_block_mesh(c, p);
555	0	p += 8;
556	0	bytes -= 8;
557	0	}
558	0	if (bytes > 0) {
559	0	memcpy(c->partial_block, p, bytes);
560	0	}
561	0	c->bytes_left = bytes;
562	0	return 1;
563	0	}
564
565		int gost_imit_final(EVP_MD_CTX ctx, unsigned char md)
566	0	{
567	0	struct ossl_gost_imit_ctx *c = ctx->md_data;
568	0	if (!c->key_set) {
569	0	GOSTerr(GOST_F_GOST_IMIT_FINAL, GOST_R_MAC_KEY_NOT_SET);
570	0	return 0;
571	0	}
572	0	if (c->count == 0 && c->bytes_left) {
573	0	unsigned char buffer[8];
574	0	memset(buffer, 0, 8);
575	0	gost_imit_update(ctx, buffer, 8);
576	0	}
577	0	if (c->bytes_left) {
578	0	int i;
579	0	for (i = c->bytes_left; i < 8; i++) {
580	0	c->partial_block[i] = 0;
581	0	}
582	0	mac_block_mesh(c, c->partial_block);
583	0	}
584	0	get_mac(c->buffer, 32, md);
585	0	return 1;
586	0	}
587
588		int gost_imit_ctrl(EVP_MD_CTX ctx, int type, int arg, void ptr)
589	0	{
590	0	switch (type) {
591	0	case EVP_MD_CTRL_KEY_LEN:
592	0	((unsigned int )(ptr)) = 32;
593	0	return 1;
594	0	case EVP_MD_CTRL_SET_KEY:
595	0	{
596	0	if (arg != 32) {
597	0	GOSTerr(GOST_F_GOST_IMIT_CTRL, GOST_R_INVALID_MAC_KEY_LENGTH);
598	0	return 0;
599	0	}
600
601	0	gost_key(&(((struct ossl_gost_imit_ctx *)(ctx->md_data))->cctx),
602	0	ptr);
603	0	((struct ossl_gost_imit_ctx *)(ctx->md_data))->key_set = 1;
604	0	return 1;
605
606	0	}
607	0	default:
608	0	return 0;
609	0	}
610	0	}
611
612		int gost_imit_copy(EVP_MD_CTX to, const EVP_MD_CTX from)
613	0	{
614	0	memcpy(to->md_data, from->md_data, sizeof(struct ossl_gost_imit_ctx));
615	0	return 1;
616	0	}
617
618		/* Clean up imit ctx */
619		int gost_imit_cleanup(EVP_MD_CTX *ctx)
620	0	{
621	0	memset(ctx->md_data, 0, sizeof(struct ossl_gost_imit_ctx));
622	0	return 1;
623	0	}