624 lines
19 KiB
C
624 lines
19 KiB
C
/**********************************************************************
|
|
* 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;
|
|
}
|