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gost_crypt.c
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gost_crypt.c
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/**********************************************************************
* 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/err.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_cbc(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);
static int gost_cipher_init_cp_12(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 CBC mode */
static int gost_cipher_do_cbc(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_cbc = {
NID_gost89_cbc,
8, /*block_size */
32, /*key_size */
8, /*iv_len */
EVP_CIPH_CBC_MODE |
EVP_CIPH_CUSTOM_IV | EVP_CIPH_RAND_KEY | EVP_CIPH_ALWAYS_CALL_INIT,
gost_cipher_init_cbc,
gost_cipher_do_cbc,
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,
};
EVP_CIPHER cipher_gost_cpcnt_12 = {
NID_gost89_cnt_12,
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_cp_12,
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);
static int gost_imit_init_cp_12(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
};
EVP_MD imit_gost_cp_12 = {
NID_gost_mac_12,
NID_undef,
4,
0,
gost_imit_init_cp_12,
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_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_tc26_gost_28147_param_Z, &Gost28147_TC26ParamSetZ, 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)) {
int i;
for (i = 0; gost_cipher_list[i].nid != NID_undef; i++)
if (gost_cipher_list[i].nid == NID_id_tc26_gost_28147_param_Z)
return &gost_cipher_list[i];
return &gost_cipher_list[0];
}
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_cnt(EVP_CIPHER_CTX *ctx,
const unsigned char *key,
const unsigned char *iv,
gost_subst_block * block)
{
struct ossl_gost_cipher_ctx *c = ctx->cipher_data;
gost_init(&(c->cctx), block);
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;
}
static int gost_cipher_init_cpa(EVP_CIPHER_CTX *ctx, const unsigned char *key,
const unsigned char *iv, int enc)
{
return gost_cipher_init_cnt(ctx, key, iv, &Gost28147_CryptoProParamSetA);
}
static int gost_cipher_init_cp_12(EVP_CIPHER_CTX *ctx,
const unsigned char *key,
const unsigned char *iv, int enc)
{
return gost_cipher_init_cnt(ctx, key, iv, &Gost28147_TC26ParamSetZ);
}
/* 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);
}
/* Initializes EVP_CIPHER_CTX with default values */
int gost_cipher_init_cbc(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_CBC_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 encryptoon in CBC mode */
int gost_cipher_do_cbc(EVP_CIPHER_CTX *ctx, unsigned char *out,
const unsigned char *in, size_t inl)
{
unsigned char b[8];
const unsigned char *in_ptr = in;
unsigned char *out_ptr = out;
int i;
struct ossl_gost_cipher_ctx *c = ctx->cipher_data;
OPENSSL_assert(inl % 8 == 0);
if (ctx->encrypt) {
while (inl > 0) {
for (i = 0; i < 8; i++) {
b[i] = ctx->iv[i] ^ in_ptr[i];
}
gostcrypt(&(c->cctx), b, out_ptr);
memcpy(ctx->iv, out_ptr, 8);
out_ptr += 8;
in_ptr += 8;
inl -= 8;
}
} else {
while (inl > 0) {
gostdecrypt(&(c->cctx), in_ptr, b);
for (i = 0; i < 8; i++) {
out_ptr[i] = ctx->iv[i] ^ b[i];
}
memcpy(ctx->iv, in_ptr, 8);
out_ptr += 8;
in_ptr += 8;
inl -= 8;
}
}
return 1;
}
/* 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_INIT:
{
struct ossl_gost_cipher_ctx *c = ctx->cipher_data;
if (c == NULL) {
return -1;
}
return gost_cipher_set_param(c, arg);
}
case EVP_CTRL_RAND_KEY:
{
if (RAND_bytes((unsigned char *)ptr, ctx->key_len) <= 0) {
GOSTerr(GOST_F_GOST_CIPHER_CTL, GOST_R_RNG_ERROR);
return -1;
}
break;
}
case EVP_CTRL_PBE_PRF_NID:
if (ptr) {
const char *params = get_gost_engine_param(GOST_PARAM_PBE_PARAMS);
int nid = NID_id_tc26_hmac_gost_3411_2012_512;
if (params) {
if (!strcmp("md_gost12_256", params))
nid = NID_id_tc26_hmac_gost_3411_2012_256;
else if (!strcmp("md_gost12_512", params))
nid = NID_id_tc26_hmac_gost_3411_2012_512;
else if (!strcmp("md_gost94", params))
nid = NID_id_HMACGostR3411_94;
}
*((int *)ptr) = nid;
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, ERR_R_MALLOC_FAILURE);
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, ERR_R_MALLOC_FAILURE);
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 = OPENSSL_malloc(len);
if (!buf) {
GOST_CIPHER_PARAMS_free(gcp);
GOSTerr(GOST_F_GOST89_SET_ASN1_PARAMETERS, ERR_R_MALLOC_FAILURE);
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, ERR_R_MALLOC_FAILURE);
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;
int nid;
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;
}
nid = OBJ_obj2nid(gcp->enc_param_set);
if (nid == NID_undef) {
GOST_CIPHER_PARAMS_free(gcp);
GOSTerr(GOST_F_GOST89_GET_ASN1_PARAMETERS,
GOST_R_INVALID_CIPHER_PARAM_OID);
return -1;
}
if (!gost_cipher_set_param(c, nid)) {
GOST_CIPHER_PARAMS_free(gcp);
return -1;
}
memcpy(ctx->oiv, gcp->iv->data, len);
GOST_CIPHER_PARAMS_free(gcp);
return 1;
}
static int gost_imit_init(EVP_MD_CTX *ctx, gost_subst_block * block)
{
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;
c->dgst_size = 4;
gost_init(&(c->cctx), block);
return 1;
}
static int gost_imit_init_cpa(EVP_MD_CTX *ctx)
{
return gost_imit_init(ctx, &Gost28147_CryptoProParamSetA);
}
static int gost_imit_init_cp_12(EVP_MD_CTX *ctx)
{
return gost_imit_init(ctx, &Gost28147_TC26ParamSetZ);
}
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, 8 * c->dgst_size, 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:
{
struct ossl_gost_imit_ctx *gost_imit_ctx = ctx->md_data;
if (ctx->digest->init(ctx) <= 0) {
GOSTerr(GOST_F_GOST_IMIT_CTRL, GOST_R_MAC_KEY_NOT_SET);
return 0;
}
ctx->flags |= EVP_MD_CTX_FLAG_NO_INIT;
if (arg == 0) {
struct gost_mac_key *key = (struct gost_mac_key *)ptr;
if (key->mac_param_nid != NID_undef) {
const struct gost_cipher_info *param =
get_encryption_params(OBJ_nid2obj
(key->mac_param_nid));
if (param == NULL) {
GOSTerr(GOST_F_GOST_IMIT_CTRL,
GOST_R_INVALID_MAC_PARAMS);
return 0;
}
gost_init(&(gost_imit_ctx->cctx), param->sblock);
}
gost_key(&(gost_imit_ctx->cctx), key->key);
gost_imit_ctx->key_set = 1;
return 1;
} else if (arg == 32) {
gost_key(&(gost_imit_ctx->cctx), ptr);
gost_imit_ctx->key_set = 1;
return 1;
}
GOSTerr(GOST_F_GOST_IMIT_CTRL, GOST_R_INVALID_MAC_KEY_SIZE);
return 0;
}
case EVP_MD_CTRL_MAC_LEN:
{
struct ossl_gost_imit_ctx *c = ctx->md_data;
if (arg < 1 || arg > 8) {
GOSTerr(GOST_F_GOST_IMIT_CTRL, GOST_R_INVALID_MAC_SIZE);
return 0;
}
c->dgst_size = arg;
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;
}