Revision 4108e77e0eb091fdd9b9c4174374a6ac0cc0abd0 authored by Dmitry Belyavskiy on 27 May 2020, 09:56:07 UTC, committed by Dmitry Belyavskiy on 27 May 2020, 09:56:07 UTC
1 parent a90ad6c
gost_crypt.c
/**********************************************************************
* gost_crypt.c - Initialize all ciphers *
* *
* Copyright (c) 2005-2006 Cryptocom LTD *
* Copyright (c) 2020 Chikunov Vitaly <vt@altlinux.org> *
* 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"
#include "gost_gost2015.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);
static int magma_cipher_init(EVP_CIPHER_CTX *ctx, const unsigned char *key,
const unsigned char *iv, int enc);
static int magma_cipher_init_ctr_acpkm_omac(EVP_CIPHER_CTX *ctx, const unsigned char *key,
const unsigned char *iv, int enc);
/* Handles block of data in CBC mode */
static int magma_cipher_do_cbc(EVP_CIPHER_CTX *ctx, unsigned char *out,
const unsigned char *in, size_t inl);
static int magma_cipher_do_ctr(EVP_CIPHER_CTX *ctx, unsigned char *out,
const unsigned char *in, size_t inl);
static int magma_cipher_do_ctr_acpkm_omac(EVP_CIPHER_CTX *ctx, unsigned char *out,
const unsigned char *in, size_t inl);
/* set/get cipher parameters */
static int magma_set_asn1_parameters(EVP_CIPHER_CTX *ctx, ASN1_TYPE *params);
static int magma_get_asn1_parameters(EVP_CIPHER_CTX *ctx, ASN1_TYPE *params);
/* Control function */
static int magma_cipher_ctl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr);
static int magma_cipher_ctl_acpkm_omac(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr);
/*
* Single level template accessor.
* Note: that you cannot template 0 value.
*/
#define TPL(st,field) ( \
((st)->field) ?: TPL_VAL(st,field) \
)
#define TPL_VAL(st,field) ( \
((st)->template ? (st)->template->field : 0) \
)
EVP_CIPHER *GOST_init_cipher(GOST_cipher *c)
{
if (c->cipher)
return c->cipher;
/* Some sanity checking. */
int flags = c->flags | TPL_VAL(c, flags);
int block_size = TPL(c, block_size);
switch (flags & EVP_CIPH_MODE) {
case EVP_CIPH_CTR_MODE:
case EVP_CIPH_CFB_MODE:
case EVP_CIPH_OFB_MODE:
OPENSSL_assert(block_size == 1);
OPENSSL_assert(flags & EVP_CIPH_NO_PADDING);
break;
default:
OPENSSL_assert(block_size != 1);
OPENSSL_assert(!(flags & EVP_CIPH_NO_PADDING));
}
if (TPL(c, iv_len))
OPENSSL_assert(flags & EVP_CIPH_CUSTOM_IV);
else
OPENSSL_assert(!(flags & EVP_CIPH_CUSTOM_IV));
EVP_CIPHER *cipher;
if (!(cipher = EVP_CIPHER_meth_new(c->nid, block_size, TPL(c, key_len)))
|| !EVP_CIPHER_meth_set_iv_length(cipher, TPL(c, iv_len))
|| !EVP_CIPHER_meth_set_flags(cipher, flags)
|| !EVP_CIPHER_meth_set_init(cipher, TPL(c, init))
|| !EVP_CIPHER_meth_set_do_cipher(cipher, TPL(c, do_cipher))
|| !EVP_CIPHER_meth_set_cleanup(cipher, TPL(c, cleanup))
|| !EVP_CIPHER_meth_set_impl_ctx_size(cipher, TPL(c, ctx_size))
|| !EVP_CIPHER_meth_set_set_asn1_params(cipher, TPL(c, set_asn1_parameters))
|| !EVP_CIPHER_meth_set_get_asn1_params(cipher, TPL(c, get_asn1_parameters))
|| !EVP_CIPHER_meth_set_ctrl(cipher, TPL(c, ctrl))) {
EVP_CIPHER_meth_free(cipher);
cipher = NULL;
}
c->cipher = cipher;
return c->cipher;
}
void GOST_deinit_cipher(GOST_cipher *c)
{
if (c->cipher) {
EVP_CIPHER_meth_free(c->cipher);
c->cipher = NULL;
}
}
static GOST_cipher gost_template_cipher = {
.block_size = 8,
.key_len = 32,
.iv_len = 8,
.flags = EVP_CIPH_CUSTOM_IV |
EVP_CIPH_RAND_KEY |
EVP_CIPH_ALWAYS_CALL_INIT,
.cleanup = gost_cipher_cleanup,
.ctx_size = sizeof(struct ossl_gost_cipher_ctx),
.set_asn1_parameters = gost89_set_asn1_parameters,
.get_asn1_parameters = gost89_get_asn1_parameters,
.ctrl = gost_cipher_ctl,
};
GOST_cipher Gost28147_89_cipher = {
.nid = NID_id_Gost28147_89,
.template = &gost_template_cipher,
.block_size = 1,
.flags = EVP_CIPH_CFB_MODE |
EVP_CIPH_NO_PADDING,
.init = gost_cipher_init,
.do_cipher = gost_cipher_do_cfb,
};
GOST_cipher Gost28147_89_cbc_cipher = {
.nid = NID_gost89_cbc,
.template = &gost_template_cipher,
.flags = EVP_CIPH_CBC_MODE,
.init = gost_cipher_init_cbc,
.do_cipher = gost_cipher_do_cbc,
};
GOST_cipher Gost28147_89_cnt_cipher = {
.nid = NID_gost89_cnt,
.template = &gost_template_cipher,
.block_size = 1,
.flags = EVP_CIPH_OFB_MODE |
EVP_CIPH_NO_PADDING,
.init = gost_cipher_init_cpa,
.do_cipher = gost_cipher_do_cnt,
};
GOST_cipher Gost28147_89_cnt_12_cipher = {
.nid = NID_gost89_cnt_12,
.template = &gost_template_cipher,
.block_size = 1,
.flags = EVP_CIPH_OFB_MODE |
EVP_CIPH_NO_PADDING,
.init = gost_cipher_init_cp_12,
.do_cipher = gost_cipher_do_cnt,
};
static GOST_cipher magma_template_cipher = {
.block_size = 8,
.key_len = 32,
.iv_len = 8,
.flags = EVP_CIPH_CUSTOM_IV |
EVP_CIPH_RAND_KEY |
EVP_CIPH_ALWAYS_CALL_INIT,
.cleanup = gost_cipher_cleanup,
.ctx_size = sizeof(struct ossl_gost_cipher_ctx),
.set_asn1_parameters = magma_set_asn1_parameters,
.get_asn1_parameters = magma_get_asn1_parameters,
.do_cipher = magma_cipher_do_ctr,
.ctrl = magma_cipher_ctl,
};
GOST_cipher magma_ctr_cipher = {
.nid = NID_magma_ctr,
.template = &magma_template_cipher,
.block_size = 1,
.iv_len = 4,
.flags = EVP_CIPH_CTR_MODE |
EVP_CIPH_NO_PADDING,
.init = magma_cipher_init,
};
GOST_cipher magma_ctr_acpkm_cipher = {
.nid = NID_magma_ctr_acpkm,
.template = &magma_template_cipher,
.block_size = 1,
.iv_len = 4,
.flags = EVP_CIPH_CTR_MODE |
EVP_CIPH_NO_PADDING,
.init = magma_cipher_init,
};
GOST_cipher magma_ctr_acpkm_omac_cipher = {
.nid = NID_magma_ctr_acpkm_omac,
.template = &magma_template_cipher,
.block_size = 1,
.iv_len = 4,
.flags = EVP_CIPH_CTR_MODE |
EVP_CIPH_NO_PADDING |
EVP_CIPH_CUSTOM_COPY |
EVP_CIPH_FLAG_CUSTOM_CIPHER |
EVP_CIPH_FLAG_CIPHER_WITH_MAC,
.init = magma_cipher_init_ctr_acpkm_omac,
.do_cipher = magma_cipher_do_ctr_acpkm_omac,
.ctrl = magma_cipher_ctl_acpkm_omac,
};
GOST_cipher magma_cbc_cipher = {
.nid = NID_magma_cbc,
.template = &gost_template_cipher,
.flags = EVP_CIPH_CBC_MODE,
.init = magma_cipher_init,
.do_cipher = magma_cipher_do_cbc,
};
/* 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);
GOST_digest Gost28147_89_MAC_digest = {
.nid = NID_id_Gost28147_89_MAC,
.result_size = 4,
.input_blocksize = 8,
.app_datasize = sizeof(struct ossl_gost_imit_ctx),
.flags = EVP_MD_FLAG_XOF,
.init = gost_imit_init_cpa,
.update = gost_imit_update,
.final = gost_imit_final,
.copy = gost_imit_copy,
.cleanup = gost_imit_cleanup,
.ctrl = gost_imit_ctrl,
};
GOST_digest Gost28147_89_mac_12_digest = {
.nid = NID_gost_mac_12,
.result_size = 4,
.input_blocksize = 8,
.app_datasize = sizeof(struct ossl_gost_imit_ctx),
.flags = EVP_MD_FLAG_XOF,
.init = gost_imit_init_cp_12,
.update = gost_imit_update,
.final = gost_imit_final,
.copy = gost_imit_copy,
.cleanup = gost_imit_cleanup,
.ctrl = 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
*/
static 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);
ERR_add_error_data(3, "Unsupported CRYPT_PARAMS='",
params, "' specified in environment or in config");
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 = EVP_CIPHER_CTX_get_cipher_data(ctx);
if (EVP_CIPHER_CTX_get_app_data(ctx) == NULL) {
if (!gost_cipher_set_param(c, paramNID))
return 0;
EVP_CIPHER_CTX_set_app_data(ctx, EVP_CIPHER_CTX_get_cipher_data(ctx));
}
if (key)
gost_key(&(c->cctx), key);
if (iv) {
memcpy((unsigned char *)EVP_CIPHER_CTX_original_iv(ctx), iv,
EVP_CIPHER_CTX_iv_length(ctx));
}
memcpy(EVP_CIPHER_CTX_iv_noconst(ctx),
EVP_CIPHER_CTX_original_iv(ctx), 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 = EVP_CIPHER_CTX_get_cipher_data(ctx);
gost_init(&(c->cctx), block);
c->key_meshing = 1;
c->count = 0;
if (key)
gost_key(&(c->cctx), key);
if (iv) {
memcpy((unsigned char *)EVP_CIPHER_CTX_original_iv(ctx), iv,
EVP_CIPHER_CTX_iv_length(ctx));
}
memcpy(EVP_CIPHER_CTX_iv_noconst(ctx),
EVP_CIPHER_CTX_original_iv(ctx), 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 */
static 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 */
static 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);
}
/* Initializes EVP_CIPHER_CTX with default values */
static int magma_cipher_init(EVP_CIPHER_CTX *ctx, const unsigned char *key,
const unsigned char *iv, int enc)
{
struct ossl_gost_cipher_ctx *c = EVP_CIPHER_CTX_get_cipher_data(ctx);
/* FIXME this is just initializtion check */
if (EVP_CIPHER_CTX_get_app_data(ctx) == NULL) {
if (!gost_cipher_set_param(c, NID_id_tc26_gost_28147_param_Z))
return 0;
EVP_CIPHER_CTX_set_app_data(ctx, EVP_CIPHER_CTX_get_cipher_data(ctx));
if (enc) {
if (init_zero_kdf_seed(c->kdf_seed) == 0)
return -1;
}
}
if (key)
magma_key(&(c->cctx), key);
if (iv) {
memcpy((unsigned char *)EVP_CIPHER_CTX_original_iv(ctx), iv,
EVP_CIPHER_CTX_iv_length(ctx));
}
memcpy(EVP_CIPHER_CTX_iv_noconst(ctx),
EVP_CIPHER_CTX_original_iv(ctx), EVP_CIPHER_CTX_iv_length(ctx));
if (EVP_CIPHER_CTX_nid(ctx) == NID_magma_ctr_acpkm
|| EVP_CIPHER_CTX_nid(ctx) == NID_magma_ctr_acpkm_omac) {
c->key_meshing = 1024;
} else {
c->key_meshing = 0;
}
return 1;
}
/* Initializes EVP_CIPHER_CTX with default values */
static int magma_cipher_init_ctr_acpkm_omac(EVP_CIPHER_CTX *ctx, const unsigned char *key,
const unsigned char *iv, int enc)
{
if (key) {
struct ossl_gost_cipher_ctx *c = EVP_CIPHER_CTX_get_cipher_data(ctx);
unsigned char cipher_key[32];
c->omac_ctx = EVP_MD_CTX_new();
if (c->omac_ctx == NULL) {
GOSTerr(GOST_F_MAGMA_CIPHER_INIT_CTR_ACPKM_OMAC, ERR_R_MALLOC_FAILURE);
return 0;
}
if (gost2015_acpkm_omac_init(NID_magma_mac, enc, key,
c->omac_ctx, cipher_key, c->kdf_seed) != 1) {
EVP_MD_CTX_free(c->omac_ctx);
c->omac_ctx = NULL;
return 0;
}
return magma_cipher_init(ctx, cipher_key, iv, enc);
}
return magma_cipher_init(ctx, key, iv, enc);
}
/*
* 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 CBC mode */
static 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 = EVP_CIPHER_CTX_get_cipher_data(ctx);
unsigned char *iv = EVP_CIPHER_CTX_iv_noconst(ctx);
if (EVP_CIPHER_CTX_encrypting(ctx)) {
while (inl > 0) {
for (i = 0; i < 8; i++) {
b[i] = iv[i] ^ in_ptr[i];
}
gostcrypt(&(c->cctx), b, out_ptr);
memcpy(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] = iv[i] ^ b[i];
}
memcpy(iv, in_ptr, 8);
out_ptr += 8;
in_ptr += 8;
inl -= 8;
}
}
return 1;
}
/* MAGMA encryption in CBC mode */
static int magma_cipher_do_cbc(EVP_CIPHER_CTX *ctx, unsigned char *out,
const unsigned char *in, size_t inl)
{
unsigned char b[8];
unsigned char d[8];
const unsigned char *in_ptr = in;
unsigned char *out_ptr = out;
int i;
struct ossl_gost_cipher_ctx *c = EVP_CIPHER_CTX_get_cipher_data(ctx);
unsigned char *iv = EVP_CIPHER_CTX_iv_noconst(ctx);
if (EVP_CIPHER_CTX_encrypting(ctx)) {
while (inl > 0) {
for (i = 0; i < 8; i++) {
b[7 - i] = iv[i] ^ in_ptr[i];
}
gostcrypt(&(c->cctx), b, d);
for (i = 0; i < 8; i++) {
out_ptr[7 - i] = d[i];
}
memcpy(iv, out_ptr, 8);
out_ptr += 8;
in_ptr += 8;
inl -= 8;
}
} else {
while (inl > 0) {
for (i = 0; i < 8; i++) {
d[7 - i] = in_ptr[i];
}
gostdecrypt(&(c->cctx), d, b);
memcpy(d, in_ptr, 8);
for (i = 0; i < 8; i++) {
out_ptr[i] = iv[i] ^ b[7 - i];
}
memcpy(iv, d, 8);
out_ptr += 8;
in_ptr += 8;
inl -= 8;
}
}
return 1;
}
/* increment counter (64-bit int) by 1 */
static void ctr64_inc(unsigned char *counter)
{
inc_counter(counter, 8);
}
/* MAGMA encryption in CTR mode */
static int magma_cipher_do_ctr(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;
struct ossl_gost_cipher_ctx *c = EVP_CIPHER_CTX_get_cipher_data(ctx);
unsigned char *buf = EVP_CIPHER_CTX_buf_noconst(ctx);
unsigned char *iv = EVP_CIPHER_CTX_iv_noconst(ctx);
unsigned char b[8];
/* Process partial blocks */
if (EVP_CIPHER_CTX_num(ctx)) {
for (j = EVP_CIPHER_CTX_num(ctx), i = 0; j < 8 && i < inl;
j++, i++, in_ptr++, out_ptr++) {
*out_ptr = buf[7 - j] ^ (*in_ptr);
}
if (j == 8) {
EVP_CIPHER_CTX_set_num(ctx, 0);
} else {
EVP_CIPHER_CTX_set_num(ctx, j);
return inl;
}
}
/* Process full blocks */
for (; i + 8 <= inl; i += 8, in_ptr += 8, out_ptr += 8) {
for (j = 0; j < 8; j++) {
b[7 - j] = iv[j];
}
gostcrypt(&(c->cctx), b, buf);
for (j = 0; j < 8; j++) {
out_ptr[j] = buf[7 - j] ^ in_ptr[j];
}
ctr64_inc(iv);
c->count += 8;
if (c->key_meshing && (c->count % c->key_meshing == 0))
acpkm_magma_key_meshing(&(c->cctx));
}
/* Process the rest of plaintext */
if (i < inl) {
for (j = 0; j < 8; j++) {
b[7 - j] = iv[j];
}
gostcrypt(&(c->cctx), b, buf);
for (j = 0; i < inl; j++, i++) {
out_ptr[j] = buf[7 - j] ^ in_ptr[j];
}
ctr64_inc(iv);
c->count += 8;
if (c->key_meshing && (c->count % c->key_meshing == 0))
acpkm_magma_key_meshing(&(c->cctx));
EVP_CIPHER_CTX_set_num(ctx, j);
} else {
EVP_CIPHER_CTX_set_num(ctx, 0);
}
return inl;
}
/* MAGMA encryption in CTR mode */
static int magma_cipher_do_ctr_acpkm_omac(EVP_CIPHER_CTX *ctx, unsigned char *out,
const unsigned char *in, size_t inl)
{
struct ossl_gost_cipher_ctx *c = EVP_CIPHER_CTX_get_cipher_data(ctx);
if (in == NULL && inl == 0) /* Final call */
return gost2015_final_call(ctx, c->omac_ctx, MAGMA_MAC_MAX_SIZE, c->tag, magma_cipher_do_ctr);
if (in == NULL)
return -1;
/* As in and out can be the same pointer, process unencrypted here */
if (EVP_CIPHER_CTX_encrypting(ctx))
EVP_DigestSignUpdate(c->omac_ctx, in, inl);
if (magma_cipher_do_ctr(ctx, out, in, inl) != inl)
return -1;
/* As in and out can be the same pointer, process decrypted here */
if (!EVP_CIPHER_CTX_encrypting(ctx))
EVP_DigestSignUpdate(c->omac_ctx, out, inl);
return inl;
}
/* GOST encryption in CFB mode */
static 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;
unsigned char *buf = EVP_CIPHER_CTX_buf_noconst(ctx);
unsigned char *iv = EVP_CIPHER_CTX_iv_noconst(ctx);
/* process partial block if any */
if (EVP_CIPHER_CTX_num(ctx)) {
for (j = EVP_CIPHER_CTX_num(ctx), i = 0; j < 8 && i < inl;
j++, i++, in_ptr++, out_ptr++) {
if (!EVP_CIPHER_CTX_encrypting(ctx))
buf[j + 8] = *in_ptr;
*out_ptr = buf[j] ^ (*in_ptr);
if (EVP_CIPHER_CTX_encrypting(ctx))
buf[j + 8] = *out_ptr;
}
if (j == 8) {
memcpy(iv, buf + 8, 8);
EVP_CIPHER_CTX_set_num(ctx, 0);
} else {
EVP_CIPHER_CTX_set_num(ctx, j);
return 1;
}
}
for (; i + 8 < inl; i += 8, in_ptr += 8, out_ptr += 8) {
/*
* block cipher current iv
*/
gost_crypt_mesh(EVP_CIPHER_CTX_get_cipher_data(ctx), iv, buf);
/*
* xor next block of input text with it and output it
*/
/*
* output this block
*/
if (!EVP_CIPHER_CTX_encrypting(ctx))
memcpy(iv, in_ptr, 8);
for (j = 0; j < 8; j++) {
out_ptr[j] = buf[j] ^ in_ptr[j];
}
/* Encrypt */
/* Next iv is next block of cipher text */
if (EVP_CIPHER_CTX_encrypting(ctx))
memcpy(iv, out_ptr, 8);
}
/* Process rest of buffer */
if (i < inl) {
gost_crypt_mesh(EVP_CIPHER_CTX_get_cipher_data(ctx), iv, buf);
if (!EVP_CIPHER_CTX_encrypting(ctx))
memcpy(buf + 8, in_ptr, inl - i);
for (j = 0; i < inl; j++, i++) {
out_ptr[j] = buf[j] ^ in_ptr[j];
}
EVP_CIPHER_CTX_set_num(ctx, j);
if (EVP_CIPHER_CTX_encrypting(ctx))
memcpy(buf + 8, out_ptr, j);
} else {
EVP_CIPHER_CTX_set_num(ctx, 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;
unsigned char *buf = EVP_CIPHER_CTX_buf_noconst(ctx);
unsigned char *iv = EVP_CIPHER_CTX_iv_noconst(ctx);
/* process partial block if any */
if (EVP_CIPHER_CTX_num(ctx)) {
for (j = EVP_CIPHER_CTX_num(ctx), i = 0; j < 8 && i < inl;
j++, i++, in_ptr++, out_ptr++) {
*out_ptr = buf[j] ^ (*in_ptr);
}
if (j == 8) {
EVP_CIPHER_CTX_set_num(ctx, 0);
} else {
EVP_CIPHER_CTX_set_num(ctx, j);
return 1;
}
}
for (; i + 8 < inl; i += 8, in_ptr += 8, out_ptr += 8) {
/*
* block cipher current iv
*/
/* Encrypt */
gost_cnt_next(EVP_CIPHER_CTX_get_cipher_data(ctx), iv, buf);
/*
* xor next block of input text with it and output it
*/
/*
* output this block
*/
for (j = 0; j < 8; j++) {
out_ptr[j] = buf[j] ^ in_ptr[j];
}
}
/* Process rest of buffer */
if (i < inl) {
gost_cnt_next(EVP_CIPHER_CTX_get_cipher_data(ctx), iv, buf);
for (j = 0; i < inl; j++, i++) {
out_ptr[j] = buf[j] ^ in_ptr[j];
}
EVP_CIPHER_CTX_set_num(ctx, j);
} else {
EVP_CIPHER_CTX_set_num(ctx, 0);
}
return 1;
}
/* Cleaning up of EVP_CIPHER_CTX */
static int gost_cipher_cleanup(EVP_CIPHER_CTX *ctx)
{
struct ossl_gost_cipher_ctx *c = EVP_CIPHER_CTX_get_cipher_data(ctx);
EVP_MD_CTX_free(c->omac_ctx);
gost_destroy(&(c->cctx));
EVP_CIPHER_CTX_set_app_data(ctx, NULL);
return 1;
}
/* Control function for gost cipher */
static int gost_cipher_ctl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr)
{
switch (type) {
case EVP_CTRL_RAND_KEY:
{
if (RAND_priv_bytes
((unsigned char *)ptr, EVP_CIPHER_CTX_key_length(ctx)) <= 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;
}
case EVP_CTRL_SET_SBOX:
if (ptr) {
struct ossl_gost_cipher_ctx *c =
EVP_CIPHER_CTX_get_cipher_data(ctx);
int nid;
int cur_meshing;
int ret;
if (c == NULL) {
return -1;
}
if (c->count != 0) {
return -1;
}
nid = OBJ_txt2nid(ptr);
if (nid == NID_undef) {
return 0;
}
cur_meshing = c->key_meshing;
ret = gost_cipher_set_param(c, nid);
c->key_meshing = cur_meshing;
return ret;
} else {
return 0;
}
case EVP_CTRL_KEY_MESH:
{
struct ossl_gost_cipher_ctx *c =
EVP_CIPHER_CTX_get_cipher_data(ctx);
if (c == NULL) {
return -1;
}
if (c->count != 0) {
return -1;
}
c->key_meshing = arg;
return 1;
}
default:
GOSTerr(GOST_F_GOST_CIPHER_CTL, GOST_R_UNSUPPORTED_CIPHER_CTL_COMMAND);
return -1;
}
return 1;
}
/* Control function for gost cipher */
static int magma_cipher_ctl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr)
{
switch (type) {
case EVP_CTRL_RAND_KEY:
if (RAND_priv_bytes
((unsigned char *)ptr, EVP_CIPHER_CTX_key_length(ctx)) <= 0) {
GOSTerr(GOST_F_GOST_CIPHER_CTL, GOST_R_RNG_ERROR);
return -1;
}
break;
case EVP_CTRL_KEY_MESH:
{
struct ossl_gost_cipher_ctx *c =
EVP_CIPHER_CTX_get_cipher_data(ctx);
if (c == NULL) {
return -1;
}
if (c->count != 0) {
return -1;
}
c->key_meshing = arg;
return 1;
}
default:
GOSTerr(GOST_F_MAGMA_CIPHER_CTL, GOST_R_UNSUPPORTED_CIPHER_CTL_COMMAND);
return -1;
}
return 1;
}
static int magma_cipher_ctl_acpkm_omac(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr)
{
switch (type)
{
case EVP_CTRL_PROCESS_UNPROTECTED:
{
struct ossl_gost_cipher_ctx *c = EVP_CIPHER_CTX_get_cipher_data(ctx);
STACK_OF(X509_ATTRIBUTE) *x = ptr;
return gost2015_process_unprotected_attributes(x, arg, MAGMA_MAC_MAX_SIZE, c->tag);
}
case EVP_CTRL_COPY: {
EVP_CIPHER_CTX *out = ptr;
struct ossl_gost_cipher_ctx *in_cctx = EVP_CIPHER_CTX_get_cipher_data(ctx);
struct ossl_gost_cipher_ctx *out_cctx = EVP_CIPHER_CTX_get_cipher_data(out);
if (in_cctx->omac_ctx == out_cctx->omac_ctx) {
out_cctx->omac_ctx = EVP_MD_CTX_new();
if (out_cctx->omac_ctx == NULL) {
GOSTerr(GOST_F_MAGMA_CIPHER_CTL_ACPKM_OMAC, ERR_R_MALLOC_FAILURE);
return -1;
}
}
return EVP_MD_CTX_copy(out_cctx->omac_ctx, in_cctx->omac_ctx);
}
default:
return magma_cipher_ctl(ctx, type, arg, ptr);
break;
}
}
/* Set cipher parameters from ASN1 structure */
static 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 = EVP_CIPHER_CTX_get_cipher_data(ctx);
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, EVP_CIPHER_CTX_iv(ctx), EVP_CIPHER_CTX_iv_length(ctx))) {
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 */
static int gost89_get_asn1_parameters(EVP_CIPHER_CTX *ctx, ASN1_TYPE *params)
{
int len;
GOST_CIPHER_PARAMS *gcp = NULL;
unsigned char *p;
struct ossl_gost_cipher_ctx *c = EVP_CIPHER_CTX_get_cipher_data(ctx);
int nid;
if (ASN1_TYPE_get(params) != V_ASN1_SEQUENCE) {
return -1;
}
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 != EVP_CIPHER_CTX_iv_length(ctx)) {
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;
}
/*XXX missing non-const accessor */
memcpy((unsigned char *)EVP_CIPHER_CTX_original_iv(ctx), gcp->iv->data,
EVP_CIPHER_CTX_iv_length(ctx));
GOST_CIPHER_PARAMS_free(gcp);
return 1;
}
#define MAGMA_UKM_LEN 12
static int magma_set_asn1_parameters (EVP_CIPHER_CTX *ctx, ASN1_TYPE *params)
{
struct ossl_gost_cipher_ctx *c = EVP_CIPHER_CTX_get_cipher_data(ctx);
c->key_meshing = 8192;
return gost2015_set_asn1_params(params, EVP_CIPHER_CTX_original_iv(ctx), 4,
c->kdf_seed);
}
static int magma_get_asn1_parameters(EVP_CIPHER_CTX *ctx, ASN1_TYPE *params)
{
struct ossl_gost_cipher_ctx *c = EVP_CIPHER_CTX_get_cipher_data(ctx);
unsigned char iv[16];
c->key_meshing = 8192;
if (gost2015_get_asn1_params(params, MAGMA_UKM_LEN, iv, 4, c->kdf_seed) < 0)
return -1;
memcpy(EVP_CIPHER_CTX_iv_noconst(ctx), iv, sizeof(iv));
memcpy((unsigned char *)EVP_CIPHER_CTX_original_iv(ctx), iv, sizeof(iv));
/* Key meshing 8 kb*/
c->key_meshing = 8192;
return 1;
}
static int gost_imit_init(EVP_MD_CTX *ctx, gost_subst_block * block)
{
struct ossl_gost_imit_ctx *c = EVP_MD_CTX_md_data(ctx);
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)
{
/*
* We are using NULL 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), NULL);
}
mac_block(&(c->cctx), c->buffer, data);
c->count = c->count % 1024 + 8;
}
static int gost_imit_update(EVP_MD_CTX *ctx, const void *data, size_t count)
{
struct ossl_gost_imit_ctx *c = EVP_MD_CTX_md_data(ctx);
const unsigned char *p = data;
size_t bytes = count;
if (!(c->key_set)) {
GOSTerr(GOST_F_GOST_IMIT_UPDATE, GOST_R_MAC_KEY_NOT_SET);
return 0;
}
if (c->bytes_left) {
size_t i;
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;
}
static int gost_imit_final(EVP_MD_CTX *ctx, unsigned char *md)
{
struct ossl_gost_imit_ctx *c = EVP_MD_CTX_md_data(ctx);
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;
}
static 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 = EVP_MD_CTX_md_data(ctx);
if (EVP_MD_meth_get_init(EVP_MD_CTX_md(ctx)) (ctx) <= 0) {
GOSTerr(GOST_F_GOST_IMIT_CTRL, GOST_R_MAC_KEY_NOT_SET);
return 0;
}
EVP_MD_CTX_set_flags(ctx, 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_XOF_LEN:
{
struct ossl_gost_imit_ctx *c = EVP_MD_CTX_md_data(ctx);
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;
}
}
static int gost_imit_copy(EVP_MD_CTX *to, const EVP_MD_CTX *from)
{
if (EVP_MD_CTX_md_data(to) && EVP_MD_CTX_md_data(from)) {
memcpy(EVP_MD_CTX_md_data(to), EVP_MD_CTX_md_data(from),
sizeof(struct ossl_gost_imit_ctx));
}
return 1;
}
/* Clean up imit ctx */
static int gost_imit_cleanup(EVP_MD_CTX *ctx)
{
memset(EVP_MD_CTX_md_data(ctx), 0, sizeof(struct ossl_gost_imit_ctx));
return 1;
}
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