Утилита для конвертации ключей КриптоПро в нормальный PEM формат (openssl)
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// https://habrahabr.ru/post/275039/
// Требуется либо OpenSSL 1.0.x (ГОСТ в составе), либо https://github.com/gost-engine/engine
// Сборка:
// 1) apt-get install libengine-gost-openssl1.1
// 2) make
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <openssl/pem.h>
#include <openssl/cms.h>
#include <openssl/err.h>
#include "gost_lcl.h"
#if OPENSSL_VERSION_NUMBER >= 0x10100000
#define fill_GOST2001_params fill_GOST_EC_params
#define gost2001_compute_public gost_ec_compute_public
#endif
/* Convert little-endian byte array into bignum */
BIGNUM *reverse32bn(char *b, BN_CTX *ctx)
{
BIGNUM *res;
char buf[32];
BUF_reverse(buf, b, 32);
res = BN_bin2bn(buf, 32, BN_CTX_get(ctx));
OPENSSL_cleanse(buf, sizeof(buf));
return res;
}
void xor_material(char *buf36, char *buf5C, char *src)
{
int i;
for(i = 0; i < 32; i++)
{
buf36[i] = src[i] ^ 0x36;
buf5C[i] = src[i] ^ 0x5C;
}
}
int make_pwd_key(char *result_key, char *start12, int start12_len, char *passw)
{
int result;
int i;
char pincode4[1024];
int pin_len;
char current[32];
char material36[32];
char material5C[32];
char hash_result[32];
gost_hash_ctx ctx;
init_gost_hash_ctx(&ctx, &GostR3411_94_CryptoProParamSet);
memset(pincode4, 0, sizeof(pincode4));
pin_len = strlen(passw);
if (pin_len*4 > sizeof(pincode4)) { result = 1; goto err; }
for(i = 0; i < pin_len; i++)
pincode4[i*4] = passw[i];
start_hash(&ctx);
hash_block(&ctx, start12, start12_len);
if (pin_len)
hash_block(&ctx, pincode4, pin_len * 4);
finish_hash(&ctx, hash_result);
memcpy(current, (char*)"DENEFH028.760246785.IUEFHWUIO.EF", 32);
for(i = 0; i < (pin_len?2000:2); i++)
{
xor_material(material36, material5C, current);
start_hash(&ctx);
hash_block(&ctx, material36, 32);
hash_block(&ctx, hash_result, 32);
hash_block(&ctx, material5C, 32);
hash_block(&ctx, hash_result, 32);
finish_hash(&ctx, current);
}
xor_material(material36, material5C, current);
start_hash(&ctx);
hash_block(&ctx, material36, 32);
hash_block(&ctx, start12, start12_len);
hash_block(&ctx, material5C, 32);
if (pin_len)
hash_block(&ctx, pincode4, pin_len * 4);
finish_hash(&ctx, current);
start_hash(&ctx);
hash_block(&ctx, current, 32);
finish_hash(&ctx, result_key);
result = 0; //ok
err:
return result;
}
BIGNUM *decode_primary_key(char *pwd_key, char *primary_key, BN_CTX *bn_ctx)
{
BIGNUM *res;
char buf[32];
gost_ctx ctx;
gost_init(&ctx, gost_cipher_list->sblock);
gost_key(&ctx, pwd_key);
gost_dec(&ctx, primary_key, buf, 4);
res = reverse32bn(buf, bn_ctx);
OPENSSL_cleanse(buf, sizeof(buf));
return res;
}
BIGNUM *remove_mask_and_check_public(char *oid_param_set8, BIGNUM *key_with_mask, BIGNUM *mask, char *public8, BN_CTX *ctx)
{
int result;
EC_KEY *eckey = NULL;
const EC_POINT *pubkey;
const EC_GROUP *group;
BIGNUM *X, *Y, *order, *raw_secret, *mask_inv;
char outbuf[32], public_X[32];
ASN1_OBJECT *obj;
int nid;
order = BN_CTX_get(ctx);
mask_inv = BN_CTX_get(ctx);
raw_secret = BN_CTX_get(ctx);
X = BN_CTX_get(ctx);
Y = BN_CTX_get(ctx);
if (!order || !mask_inv || !raw_secret || !X || !Y) { result = 1; goto err; }
obj = ASN1_OBJECT_create(0, oid_param_set8+1, *oid_param_set8, NULL, NULL);
nid = OBJ_obj2nid(obj);
ASN1_OBJECT_free(obj);
if (!(eckey = EC_KEY_new())) { result = 1; goto err; }
if (!fill_GOST2001_params(eckey, nid)) { result = 1; goto err; }
if (!(group = EC_KEY_get0_group(eckey))) { result = 1; goto err; }
if (!EC_GROUP_get_order(group, order, ctx)) { result = 1; goto err; }
if (!BN_mod_inverse(mask_inv, mask, order, ctx)) { result = 1; goto err; }
if (!BN_mod_mul(raw_secret, key_with_mask, mask_inv, order, ctx)) { result = 1; goto err; }
if (!EC_KEY_set_private_key(eckey, raw_secret)) { result = 1; goto err; }
if (!gost2001_compute_public(eckey)) { result = 1; goto err; }
if (!(pubkey = EC_KEY_get0_public_key(eckey))) { result = 1; goto err; }
if (!EC_POINT_get_affine_coordinates_GFp(group, pubkey, X, Y, ctx)) { result = 1; goto err; }
store_bignum(X, outbuf, sizeof(outbuf));
BUF_reverse(public_X, outbuf, sizeof(outbuf));
if (memcmp(public_X, public8, 8) != 0) { result = 1; goto err; }
result = 0; //ok
err:
if (eckey) EC_KEY_free(eckey);
if (result == 0) return raw_secret;
return NULL;
}
int file_length(char *fname)
{
int len;
FILE *f = fopen(fname, "rb");
if (f == NULL) return -1;
fseek(f, 0, SEEK_END);
len = ftell(f);
fclose(f);
return len;
}
int read_file(char *fname, int start_pos, char *buf, int len)
{
int read_len;
FILE *f = fopen(fname, "rb");
if (f == NULL) return 1;
if (start_pos) fseek(f, start_pos, SEEK_SET);
read_len = fread(buf, 1, len, f);
fclose(f);
if (read_len != len) return 1;
return 0; //ok
}
int get_asn1_len(unsigned char *buf, int *size_hdr)
{
int n, i, res;
int pos = 0;
if ((buf[pos]&0x80) == 0) {
*size_hdr = 1;
return buf[pos];
}
n = buf[pos++]&0x7f;
res = 0;
for(i = 0; i < n; i++) {
res = res*256 + buf[pos++];
}
*size_hdr = n+1;
return res;
}
#define MAX_HEADER 20000
int read_container(char *fpath, int flag2, char *salt12, char *primary_key, char *masks_key, char *public8, char *oid_param_set8)
{
int result;
char primary_path[1024+30];
char masks_path[1024+30];
char header_path[1024+30];
char header_buf[MAX_HEADER];
int header_len;
int i, len, pos, size_hdr;
if (strlen(fpath)>1024) { result = 1; goto err; }
sprintf(header_path, "%s/header.key", fpath);
if (flag2 == 0)
{
sprintf(primary_path, "%s/primary.key", fpath);
sprintf(masks_path, "%s/masks.key", fpath);
}
else
{
sprintf(primary_path, "%s/primary2.key", fpath);
sprintf(masks_path, "%s/masks2.key", fpath);
}
if (read_file(primary_path, 4, primary_key, 32)) { result = 1; goto err; }
if (read_file(masks_path, 4, masks_key, 32)) { result = 1; goto err; }
if (read_file(masks_path, 0x26, salt12, 12)) { result = 1; goto err; }
header_len = file_length(header_path);
if (header_len < 0x42 || header_len > MAX_HEADER) { result = 1; goto err; }
if (read_file(header_path, 0, header_buf, header_len)) { result = 1; goto err; }
//------------- skip certificate ---------------------------
pos = 0;
for(i = 0; i < 2; i++)
{
get_asn1_len(header_buf+pos+1, &size_hdr);
pos += size_hdr+1;
if (pos > header_len-8) { result = 2; goto err; }
}
//------------------ get oid_param_set8 -----------------------
#define PARAM_SET_POS 34
if (memcmp(header_buf+pos+PARAM_SET_POS, "\x6\x7", 2) != 0) { result = 2; goto err; }
memcpy(oid_param_set8, header_buf+pos+PARAM_SET_POS+1, 8);
//------------------ get public8 -----------------------
result = 2; //not found
pos += 52;
for(i = 0; i < 3; i++)
{
len = get_asn1_len(header_buf+pos+1, &size_hdr);
if (len == 8 && memcmp(header_buf+pos, "\x8a\x8", 2) == 0)
{
memcpy(public8,header_buf+pos+2,8);
result = 0; //ok
break;
}
pos += len+size_hdr+1;
if (pos > header_len-8) { result = 2; goto err; }
}
err:
OPENSSL_cleanse(header_buf, sizeof(header_buf));
return result;
}
#define START_OID 0x12
#define START_KEY 0x28
unsigned char asn1_private_key[72] = {
0x30,0x46,2,1,0,0x30,0x1c,6,6,0x2a,0x85,3,2,2,0x13,0x30,0x12,6,7,0x11,
0x11,0x11,0x11,0x11,0x11,0x11,6,7,0x2a,0x85,3,2,2,0x1e,1,4,0x23,2,0x21,0
};
int main(int argc, char **argv)
{
int result;
char *container_path;
char *passw;
char salt12[12];
char primary_key[32];
char masks_key[32];
char public8[8];
char oid_param_set8[8];
BN_CTX *ctx;
BIGNUM *key_with_mask;
BIGNUM *mask;
BIGNUM *raw_key;
char pwd_key[32];
char outbuf[32];
ctx = BN_CTX_new();
if (argc == 2)
{
container_path = argv[1];
passw = "";
}
else
if (argc == 3)
{
container_path = argv[1];
passw = argv[2];
}
else
{
printf("get_private container_path [passw]\n");
result = 1;
goto err;
}
if (read_container(container_path, 0, salt12, primary_key, masks_key, public8, oid_param_set8) != 0 &&
read_container(container_path, 1, salt12, primary_key, masks_key, public8, oid_param_set8) != 0)
{
printf("can not read container from %s\n", container_path);
result = 2;
goto err;
}
make_pwd_key(pwd_key, salt12, 12, passw);
key_with_mask = decode_primary_key(pwd_key, primary_key, ctx);
OPENSSL_cleanse(pwd_key, sizeof(pwd_key));
mask = reverse32bn(masks_key, ctx);
raw_key = remove_mask_and_check_public(oid_param_set8, key_with_mask, mask, public8, ctx);
if (raw_key)
{
BIO *bio;
store_bignum(raw_key, outbuf, sizeof(outbuf));
memcpy(asn1_private_key+START_OID, oid_param_set8, 8);
memcpy(asn1_private_key+START_KEY, outbuf, 32);
//bio = BIO_new_file("private.key", "w");
bio = BIO_new_fp(stdout, BIO_NOCLOSE | BIO_FP_TEXT);
PEM_write_bio(bio, "PRIVATE KEY", "", asn1_private_key, sizeof(asn1_private_key));
BIO_free(bio);
OPENSSL_cleanse(outbuf, sizeof(outbuf));
OPENSSL_cleanse(asn1_private_key, sizeof(asn1_private_key));
result = 0; //ok
}
else
{
printf("Error check public key\n");
result = 3;
}
err:
BN_CTX_free(ctx);
OPENSSL_cleanse(salt12, sizeof(salt12));
OPENSSL_cleanse(primary_key, sizeof(primary_key));
OPENSSL_cleanse(masks_key, sizeof(masks_key));
return result;
}