gost_ameth.c revision 280304 
1/**********************************************************************
2 *                          gost_ameth.c                              *
3 *             Copyright (c) 2005-2006 Cryptocom LTD                  *
4 *         This file is distributed under the same license as OpenSSL *
5 *                                                                    *
6 *       Implementation of RFC 4490/4491 ASN1 method                  *
7 *       for OpenSSL                                                  *
8 *          Requires OpenSSL 0.9.9 for compilation                    *
9 **********************************************************************/
10#include <string.h>
11#include <openssl/crypto.h>
12#include <openssl/err.h>
13#include <openssl/engine.h>
14#include <openssl/evp.h>
15#include <openssl/asn1.h>
16#ifndef OPENSSL_NO_CMS
17# include <openssl/cms.h>
18#endif
19#include "gost_params.h"
20#include "gost_lcl.h"
21#include "e_gost_err.h"
22
23int gost94_nid_by_params(DSA *p)
24{
25    R3410_params *gost_params;
26    BIGNUM *q = BN_new();
27    for (gost_params = R3410_paramset; gost_params->q != NULL; gost_params++) {
28        BN_dec2bn(&q, gost_params->q);
29        if (!BN_cmp(q, p->q)) {
30            BN_free(q);
31            return gost_params->nid;
32        }
33    }
34    BN_free(q);
35    return NID_undef;
36}
37
38static ASN1_STRING *encode_gost_algor_params(const EVP_PKEY *key)
39{
40    ASN1_STRING *params = ASN1_STRING_new();
41    GOST_KEY_PARAMS *gkp = GOST_KEY_PARAMS_new();
42    int pkey_param_nid = NID_undef;
43
44    if (!params || !gkp) {
45        GOSTerr(GOST_F_ENCODE_GOST_ALGOR_PARAMS, ERR_R_MALLOC_FAILURE);
46        ASN1_STRING_free(params);
47        params = NULL;
48        goto err;
49    }
50    switch (EVP_PKEY_base_id(key)) {
51    case NID_id_GostR3410_2001:
52        pkey_param_nid =
53            EC_GROUP_get_curve_name(EC_KEY_get0_group
54                                    (EVP_PKEY_get0((EVP_PKEY *)key)));
55        break;
56    case NID_id_GostR3410_94:
57        pkey_param_nid =
58            (int)gost94_nid_by_params(EVP_PKEY_get0((EVP_PKEY *)key));
59        if (pkey_param_nid == NID_undef) {
60            GOSTerr(GOST_F_ENCODE_GOST_ALGOR_PARAMS,
61                    GOST_R_INVALID_GOST94_PARMSET);
62            ASN1_STRING_free(params);
63            params = NULL;
64            goto err;
65        }
66        break;
67    }
68    gkp->key_params = OBJ_nid2obj(pkey_param_nid);
69    gkp->hash_params = OBJ_nid2obj(NID_id_GostR3411_94_CryptoProParamSet);
70    /*
71     * gkp->cipher_params = OBJ_nid2obj(cipher_param_nid);
72     */
73    params->length = i2d_GOST_KEY_PARAMS(gkp, &params->data);
74    if (params->length <= 0) {
75        GOSTerr(GOST_F_ENCODE_GOST_ALGOR_PARAMS, ERR_R_MALLOC_FAILURE);
76        ASN1_STRING_free(params);
77        params = NULL;
78        goto err;
79    }
80    params->type = V_ASN1_SEQUENCE;
81 err:
82    GOST_KEY_PARAMS_free(gkp);
83    return params;
84}
85
86/*
87 * Parses GOST algorithm parameters from X509_ALGOR and modifies pkey setting
88 * NID and parameters
89 */
90static int decode_gost_algor_params(EVP_PKEY *pkey, X509_ALGOR *palg)
91{
92    ASN1_OBJECT *palg_obj = NULL;
93    int ptype = V_ASN1_UNDEF;
94    int pkey_nid = NID_undef, param_nid = NID_undef;
95    void *_pval;
96    ASN1_STRING *pval = NULL;
97    const unsigned char *p;
98    GOST_KEY_PARAMS *gkp = NULL;
99
100    X509_ALGOR_get0(&palg_obj, &ptype, &_pval, palg);
101    pval = _pval;
102    if (ptype != V_ASN1_SEQUENCE) {
103        GOSTerr(GOST_F_DECODE_GOST_ALGOR_PARAMS,
104                GOST_R_BAD_KEY_PARAMETERS_FORMAT);
105        return 0;
106    }
107    p = pval->data;
108    pkey_nid = OBJ_obj2nid(palg_obj);
109
110    gkp = d2i_GOST_KEY_PARAMS(NULL, &p, pval->length);
111    if (!gkp) {
112        GOSTerr(GOST_F_DECODE_GOST_ALGOR_PARAMS,
113                GOST_R_BAD_PKEY_PARAMETERS_FORMAT);
114        return 0;
115    }
116    param_nid = OBJ_obj2nid(gkp->key_params);
117    GOST_KEY_PARAMS_free(gkp);
118    EVP_PKEY_set_type(pkey, pkey_nid);
119    switch (pkey_nid) {
120    case NID_id_GostR3410_94:
121        {
122            DSA *dsa = EVP_PKEY_get0(pkey);
123            if (!dsa) {
124                dsa = DSA_new();
125                if (!EVP_PKEY_assign(pkey, pkey_nid, dsa))
126                    return 0;
127            }
128            if (!fill_GOST94_params(dsa, param_nid))
129                return 0;
130            break;
131        }
132    case NID_id_GostR3410_2001:
133        {
134            EC_KEY *ec = EVP_PKEY_get0(pkey);
135            if (!ec) {
136                ec = EC_KEY_new();
137                if (!EVP_PKEY_assign(pkey, pkey_nid, ec))
138                    return 0;
139            }
140            if (!fill_GOST2001_params(ec, param_nid))
141                return 0;
142        }
143    }
144
145    return 1;
146}
147
148static int gost_set_priv_key(EVP_PKEY *pkey, BIGNUM *priv)
149{
150    switch (EVP_PKEY_base_id(pkey)) {
151    case NID_id_GostR3410_94:
152        {
153            DSA *dsa = EVP_PKEY_get0(pkey);
154            if (!dsa) {
155                dsa = DSA_new();
156                EVP_PKEY_assign(pkey, EVP_PKEY_base_id(pkey), dsa);
157            }
158            dsa->priv_key = BN_dup(priv);
159            if (!EVP_PKEY_missing_parameters(pkey))
160                gost94_compute_public(dsa);
161            break;
162        }
163    case NID_id_GostR3410_2001:
164        {
165            EC_KEY *ec = EVP_PKEY_get0(pkey);
166            if (!ec) {
167                ec = EC_KEY_new();
168                EVP_PKEY_assign(pkey, EVP_PKEY_base_id(pkey), ec);
169            }
170            if (!EC_KEY_set_private_key(ec, priv))
171                return 0;
172            if (!EVP_PKEY_missing_parameters(pkey))
173                gost2001_compute_public(ec);
174            break;
175        }
176    }
177    return 1;
178}
179
180BIGNUM *gost_get0_priv_key(const EVP_PKEY *pkey)
181{
182    switch (EVP_PKEY_base_id(pkey)) {
183    case NID_id_GostR3410_94:
184        {
185            DSA *dsa = EVP_PKEY_get0((EVP_PKEY *)pkey);
186            if (!dsa) {
187                return NULL;
188            }
189            if (!dsa->priv_key)
190                return NULL;
191            return dsa->priv_key;
192            break;
193        }
194    case NID_id_GostR3410_2001:
195        {
196            EC_KEY *ec = EVP_PKEY_get0((EVP_PKEY *)pkey);
197            const BIGNUM *priv;
198            if (!ec) {
199                return NULL;
200            }
201            if (!(priv = EC_KEY_get0_private_key(ec)))
202                return NULL;
203            return (BIGNUM *)priv;
204            break;
205        }
206    }
207    return NULL;
208}
209
210static int pkey_ctrl_gost(EVP_PKEY *pkey, int op, long arg1, void *arg2)
211{
212    switch (op) {
213    case ASN1_PKEY_CTRL_PKCS7_SIGN:
214        if (arg1 == 0) {
215            X509_ALGOR *alg1 = NULL, *alg2 = NULL;
216            int nid = EVP_PKEY_base_id(pkey);
217            PKCS7_SIGNER_INFO_get0_algs((PKCS7_SIGNER_INFO *)arg2,
218                                        NULL, &alg1, &alg2);
219            X509_ALGOR_set0(alg1, OBJ_nid2obj(NID_id_GostR3411_94),
220                            V_ASN1_NULL, 0);
221            if (nid == NID_undef) {
222                return (-1);
223            }
224            X509_ALGOR_set0(alg2, OBJ_nid2obj(nid), V_ASN1_NULL, 0);
225        }
226        return 1;
227#ifndef OPENSSL_NO_CMS
228    case ASN1_PKEY_CTRL_CMS_SIGN:
229        if (arg1 == 0) {
230            X509_ALGOR *alg1 = NULL, *alg2 = NULL;
231            int nid = EVP_PKEY_base_id(pkey);
232            CMS_SignerInfo_get0_algs((CMS_SignerInfo *)arg2,
233                                     NULL, NULL, &alg1, &alg2);
234            X509_ALGOR_set0(alg1, OBJ_nid2obj(NID_id_GostR3411_94),
235                            V_ASN1_NULL, 0);
236            if (nid == NID_undef) {
237                return (-1);
238            }
239            X509_ALGOR_set0(alg2, OBJ_nid2obj(nid), V_ASN1_NULL, 0);
240        }
241        return 1;
242#endif
243    case ASN1_PKEY_CTRL_PKCS7_ENCRYPT:
244        if (arg1 == 0) {
245            X509_ALGOR *alg;
246            ASN1_STRING *params = encode_gost_algor_params(pkey);
247            if (!params) {
248                return -1;
249            }
250            PKCS7_RECIP_INFO_get0_alg((PKCS7_RECIP_INFO *)arg2, &alg);
251            X509_ALGOR_set0(alg, OBJ_nid2obj(pkey->type),
252                            V_ASN1_SEQUENCE, params);
253        }
254        return 1;
255#ifndef OPENSSL_NO_CMS
256    case ASN1_PKEY_CTRL_CMS_ENVELOPE:
257        if (arg1 == 0) {
258            X509_ALGOR *alg = NULL;
259            ASN1_STRING *params = encode_gost_algor_params(pkey);
260            if (!params) {
261                return -1;
262            }
263            CMS_RecipientInfo_ktri_get0_algs((CMS_RecipientInfo *)arg2, NULL,
264                                             NULL, &alg);
265            X509_ALGOR_set0(alg, OBJ_nid2obj(pkey->type), V_ASN1_SEQUENCE,
266                            params);
267        }
268        return 1;
269#endif
270    case ASN1_PKEY_CTRL_DEFAULT_MD_NID:
271        *(int *)arg2 = NID_id_GostR3411_94;
272        return 2;
273    }
274
275    return -2;
276}
277
278/* --------------------- free functions * ------------------------------*/
279static void pkey_free_gost94(EVP_PKEY *key)
280{
281    if (key->pkey.dsa) {
282        DSA_free(key->pkey.dsa);
283    }
284}
285
286static void pkey_free_gost01(EVP_PKEY *key)
287{
288    if (key->pkey.ec) {
289        EC_KEY_free(key->pkey.ec);
290    }
291}
292
293/* ------------------ private key functions  -----------------------------*/
294static int priv_decode_gost(EVP_PKEY *pk, PKCS8_PRIV_KEY_INFO *p8inf)
295{
296    const unsigned char *pkey_buf = NULL, *p = NULL;
297    int priv_len = 0;
298    BIGNUM *pk_num = NULL;
299    int ret = 0;
300    X509_ALGOR *palg = NULL;
301    ASN1_OBJECT *palg_obj = NULL;
302    ASN1_INTEGER *priv_key = NULL;
303
304    if (!PKCS8_pkey_get0(&palg_obj, &pkey_buf, &priv_len, &palg, p8inf))
305        return 0;
306    p = pkey_buf;
307    if (!decode_gost_algor_params(pk, palg)) {
308        return 0;
309    }
310    if (V_ASN1_OCTET_STRING == *p) {
311        /* New format - Little endian octet string */
312        unsigned char rev_buf[32];
313        int i;
314        ASN1_OCTET_STRING *s = d2i_ASN1_OCTET_STRING(NULL, &p, priv_len);
315        if (!s || s->length != 32) {
316            GOSTerr(GOST_F_PRIV_DECODE_GOST, EVP_R_DECODE_ERROR);
317            return 0;
318        }
319        for (i = 0; i < 32; i++) {
320            rev_buf[31 - i] = s->data[i];
321        }
322        ASN1_STRING_free(s);
323        pk_num = getbnfrombuf(rev_buf, 32);
324    } else {
325        priv_key = d2i_ASN1_INTEGER(NULL, &p, priv_len);
326        if (!priv_key)
327            return 0;
328        ret = ((pk_num = ASN1_INTEGER_to_BN(priv_key, NULL)) != NULL);
329        ASN1_INTEGER_free(priv_key);
330        if (!ret) {
331            GOSTerr(GOST_F_PRIV_DECODE_GOST, EVP_R_DECODE_ERROR);
332            return 0;
333        }
334    }
335
336    ret = gost_set_priv_key(pk, pk_num);
337    BN_free(pk_num);
338    return ret;
339}
340
341/* ----------------------------------------------------------------------*/
342static int priv_encode_gost(PKCS8_PRIV_KEY_INFO *p8, const EVP_PKEY *pk)
343{
344    ASN1_OBJECT *algobj = OBJ_nid2obj(EVP_PKEY_base_id(pk));
345    ASN1_STRING *params = encode_gost_algor_params(pk);
346    unsigned char *priv_buf = NULL;
347    int priv_len;
348
349    ASN1_INTEGER *asn1key = NULL;
350    if (!params) {
351        return 0;
352    }
353    asn1key = BN_to_ASN1_INTEGER(gost_get0_priv_key(pk), NULL);
354    priv_len = i2d_ASN1_INTEGER(asn1key, &priv_buf);
355    ASN1_INTEGER_free(asn1key);
356    return PKCS8_pkey_set0(p8, algobj, 0, V_ASN1_SEQUENCE, params,
357                           priv_buf, priv_len);
358}
359
360/* --------- printing keys --------------------------------*/
361static int print_gost_94(BIO *out, const EVP_PKEY *pkey, int indent,
362                         ASN1_PCTX *pctx, int type)
363{
364    int param_nid = NID_undef;
365
366    if (type == 2) {
367        BIGNUM *key;
368
369        if (!BIO_indent(out, indent, 128))
370            return 0;
371        BIO_printf(out, "Private key: ");
372        key = gost_get0_priv_key(pkey);
373        if (!key)
374            BIO_printf(out, "<undefined>");
375        else
376            BN_print(out, key);
377        BIO_printf(out, "\n");
378    }
379    if (type >= 1) {
380        BIGNUM *pubkey;
381
382        pubkey = ((DSA *)EVP_PKEY_get0((EVP_PKEY *)pkey))->pub_key;
383        BIO_indent(out, indent, 128);
384        BIO_printf(out, "Public key: ");
385        BN_print(out, pubkey);
386        BIO_printf(out, "\n");
387    }
388
389    param_nid = gost94_nid_by_params(EVP_PKEY_get0((EVP_PKEY *)pkey));
390    BIO_indent(out, indent, 128);
391    BIO_printf(out, "Parameter set: %s\n", OBJ_nid2ln(param_nid));
392    return 1;
393}
394
395static int param_print_gost94(BIO *out, const EVP_PKEY *pkey, int indent,
396                              ASN1_PCTX *pctx)
397{
398    return print_gost_94(out, pkey, indent, pctx, 0);
399}
400
401static int pub_print_gost94(BIO *out, const EVP_PKEY *pkey, int indent,
402                            ASN1_PCTX *pctx)
403{
404    return print_gost_94(out, pkey, indent, pctx, 1);
405}
406
407static int priv_print_gost94(BIO *out, const EVP_PKEY *pkey, int indent,
408                             ASN1_PCTX *pctx)
409{
410    return print_gost_94(out, pkey, indent, pctx, 2);
411}
412
413static int print_gost_01(BIO *out, const EVP_PKEY *pkey, int indent,
414                         ASN1_PCTX *pctx, int type)
415{
416    int param_nid = NID_undef;
417    if (type == 2) {
418        BIGNUM *key;
419
420        if (!BIO_indent(out, indent, 128))
421            return 0;
422        BIO_printf(out, "Private key: ");
423        key = gost_get0_priv_key(pkey);
424        if (!key)
425            BIO_printf(out, "<undefined)");
426        else
427            BN_print(out, key);
428        BIO_printf(out, "\n");
429    }
430    if (type >= 1) {
431        BN_CTX *ctx = BN_CTX_new();
432        BIGNUM *X, *Y;
433        const EC_POINT *pubkey;
434        const EC_GROUP *group;
435
436        if (!ctx) {
437            GOSTerr(GOST_F_PRINT_GOST_01, ERR_R_MALLOC_FAILURE);
438            return 0;
439        }
440        BN_CTX_start(ctx);
441        X = BN_CTX_get(ctx);
442        Y = BN_CTX_get(ctx);
443        pubkey =
444            EC_KEY_get0_public_key((EC_KEY *)EVP_PKEY_get0((EVP_PKEY *)pkey));
445        group = EC_KEY_get0_group((EC_KEY *)EVP_PKEY_get0((EVP_PKEY *)pkey));
446        if (!EC_POINT_get_affine_coordinates_GFp(group, pubkey, X, Y, ctx)) {
447            GOSTerr(GOST_F_PRINT_GOST_01, ERR_R_EC_LIB);
448            BN_CTX_free(ctx);
449            return 0;
450        }
451        if (!BIO_indent(out, indent, 128))
452            return 0;
453        BIO_printf(out, "Public key:\n");
454        if (!BIO_indent(out, indent + 3, 128))
455            return 0;
456        BIO_printf(out, "X:");
457        BN_print(out, X);
458        BIO_printf(out, "\n");
459        BIO_indent(out, indent + 3, 128);
460        BIO_printf(out, "Y:");
461        BN_print(out, Y);
462        BIO_printf(out, "\n");
463        BN_CTX_end(ctx);
464        BN_CTX_free(ctx);
465    }
466
467    param_nid =
468        EC_GROUP_get_curve_name(EC_KEY_get0_group
469                                (EVP_PKEY_get0((EVP_PKEY *)pkey)));
470    if (!BIO_indent(out, indent, 128))
471        return 0;
472    BIO_printf(out, "Parameter set: %s\n", OBJ_nid2ln(param_nid));
473    return 1;
474}
475
476static int param_print_gost01(BIO *out, const EVP_PKEY *pkey, int indent,
477                              ASN1_PCTX *pctx)
478{
479    return print_gost_01(out, pkey, indent, pctx, 0);
480}
481
482static int pub_print_gost01(BIO *out, const EVP_PKEY *pkey, int indent,
483                            ASN1_PCTX *pctx)
484{
485    return print_gost_01(out, pkey, indent, pctx, 1);
486}
487
488static int priv_print_gost01(BIO *out, const EVP_PKEY *pkey, int indent,
489                             ASN1_PCTX *pctx)
490{
491    return print_gost_01(out, pkey, indent, pctx, 2);
492}
493
494/* ---------------------------------------------------------------------*/
495static int param_missing_gost94(const EVP_PKEY *pk)
496{
497    const DSA *dsa = EVP_PKEY_get0((EVP_PKEY *)pk);
498    if (!dsa)
499        return 1;
500    if (!dsa->q)
501        return 1;
502    return 0;
503}
504
505static int param_missing_gost01(const EVP_PKEY *pk)
506{
507    const EC_KEY *ec = EVP_PKEY_get0((EVP_PKEY *)pk);
508    if (!ec)
509        return 1;
510    if (!EC_KEY_get0_group(ec))
511        return 1;
512    return 0;
513}
514
515static int param_copy_gost94(EVP_PKEY *to, const EVP_PKEY *from)
516{
517    const DSA *dfrom = EVP_PKEY_get0((EVP_PKEY *)from);
518    DSA *dto = EVP_PKEY_get0(to);
519    if (EVP_PKEY_base_id(from) != EVP_PKEY_base_id(to)) {
520        GOSTerr(GOST_F_PARAM_COPY_GOST94, GOST_R_INCOMPATIBLE_ALGORITHMS);
521        return 0;
522    }
523    if (!dfrom) {
524        GOSTerr(GOST_F_PARAM_COPY_GOST94, GOST_R_KEY_PARAMETERS_MISSING);
525        return 0;
526    }
527    if (!dto) {
528        dto = DSA_new();
529        EVP_PKEY_assign(to, EVP_PKEY_base_id(from), dto);
530    }
531#define COPYBIGNUM(a,b,x) if (a->x) BN_free(a->x); a->x=BN_dup(b->x);
532    COPYBIGNUM(dto, dfrom, p)
533        COPYBIGNUM(dto, dfrom, q)
534        COPYBIGNUM(dto, dfrom, g)
535
536        if (dto->priv_key)
537        gost94_compute_public(dto);
538    return 1;
539}
540
541static int param_copy_gost01(EVP_PKEY *to, const EVP_PKEY *from)
542{
543    EC_KEY *eto = EVP_PKEY_get0(to);
544    const EC_KEY *efrom = EVP_PKEY_get0((EVP_PKEY *)from);
545    if (EVP_PKEY_base_id(from) != EVP_PKEY_base_id(to)) {
546        GOSTerr(GOST_F_PARAM_COPY_GOST01, GOST_R_INCOMPATIBLE_ALGORITHMS);
547        return 0;
548    }
549    if (!efrom) {
550        GOSTerr(GOST_F_PARAM_COPY_GOST01, GOST_R_KEY_PARAMETERS_MISSING);
551        return 0;
552    }
553    if (!eto) {
554        eto = EC_KEY_new();
555        EVP_PKEY_assign(to, EVP_PKEY_base_id(from), eto);
556    }
557    EC_KEY_set_group(eto, EC_KEY_get0_group(efrom));
558    if (EC_KEY_get0_private_key(eto)) {
559        gost2001_compute_public(eto);
560    }
561    return 1;
562}
563
564static int param_cmp_gost94(const EVP_PKEY *a, const EVP_PKEY *b)
565{
566    const DSA *da = EVP_PKEY_get0((EVP_PKEY *)a);
567    const DSA *db = EVP_PKEY_get0((EVP_PKEY *)b);
568    if (!BN_cmp(da->q, db->q))
569        return 1;
570    return 0;
571}
572
573static int param_cmp_gost01(const EVP_PKEY *a, const EVP_PKEY *b)
574{
575    if (EC_GROUP_get_curve_name
576        (EC_KEY_get0_group(EVP_PKEY_get0((EVP_PKEY *)a))) ==
577        EC_GROUP_get_curve_name(EC_KEY_get0_group
578                                (EVP_PKEY_get0((EVP_PKEY *)b)))) {
579        return 1;
580    }
581    return 0;
582
583}
584
585/* ---------- Public key functions * --------------------------------------*/
586static int pub_decode_gost94(EVP_PKEY *pk, X509_PUBKEY *pub)
587{
588    X509_ALGOR *palg = NULL;
589    const unsigned char *pubkey_buf = NULL;
590    unsigned char *databuf;
591    ASN1_OBJECT *palgobj = NULL;
592    int pub_len, i, j;
593    DSA *dsa;
594    ASN1_OCTET_STRING *octet = NULL;
595
596    if (!X509_PUBKEY_get0_param(&palgobj, &pubkey_buf, &pub_len, &palg, pub))
597        return 0;
598    EVP_PKEY_assign(pk, OBJ_obj2nid(palgobj), NULL);
599    if (!decode_gost_algor_params(pk, palg))
600        return 0;
601    octet = d2i_ASN1_OCTET_STRING(NULL, &pubkey_buf, pub_len);
602    if (!octet) {
603        GOSTerr(GOST_F_PUB_DECODE_GOST94, ERR_R_MALLOC_FAILURE);
604        return 0;
605    }
606    databuf = OPENSSL_malloc(octet->length);
607    for (i = 0, j = octet->length - 1; i < octet->length; i++, j--) {
608        databuf[j] = octet->data[i];
609    }
610    dsa = EVP_PKEY_get0(pk);
611    dsa->pub_key = BN_bin2bn(databuf, octet->length, NULL);
612    ASN1_OCTET_STRING_free(octet);
613    OPENSSL_free(databuf);
614    return 1;
615
616}
617
618static int pub_encode_gost94(X509_PUBKEY *pub, const EVP_PKEY *pk)
619{
620    ASN1_OBJECT *algobj = NULL;
621    ASN1_OCTET_STRING *octet = NULL;
622    void *pval = NULL;
623    unsigned char *buf = NULL, *databuf, *sptr;
624    int i, j, data_len, ret = 0;
625
626    int ptype = V_ASN1_UNDEF;
627    DSA *dsa = EVP_PKEY_get0((EVP_PKEY *)pk);
628    algobj = OBJ_nid2obj(EVP_PKEY_base_id(pk));
629    if (pk->save_parameters) {
630        ASN1_STRING *params = encode_gost_algor_params(pk);
631        pval = params;
632        ptype = V_ASN1_SEQUENCE;
633    }
634    data_len = BN_num_bytes(dsa->pub_key);
635    databuf = OPENSSL_malloc(data_len);
636    BN_bn2bin(dsa->pub_key, databuf);
637    octet = ASN1_OCTET_STRING_new();
638    ASN1_STRING_set(octet, NULL, data_len);
639    sptr = ASN1_STRING_data(octet);
640    for (i = 0, j = data_len - 1; i < data_len; i++, j--) {
641        sptr[i] = databuf[j];
642    }
643    OPENSSL_free(databuf);
644    ret = i2d_ASN1_OCTET_STRING(octet, &buf);
645    ASN1_BIT_STRING_free(octet);
646    if (ret < 0)
647        return 0;
648    return X509_PUBKEY_set0_param(pub, algobj, ptype, pval, buf, ret);
649}
650
651static int pub_decode_gost01(EVP_PKEY *pk, X509_PUBKEY *pub)
652{
653    X509_ALGOR *palg = NULL;
654    const unsigned char *pubkey_buf = NULL;
655    unsigned char *databuf;
656    ASN1_OBJECT *palgobj = NULL;
657    int pub_len, i, j;
658    EC_POINT *pub_key;
659    BIGNUM *X, *Y;
660    ASN1_OCTET_STRING *octet = NULL;
661    int len;
662    const EC_GROUP *group;
663
664    if (!X509_PUBKEY_get0_param(&palgobj, &pubkey_buf, &pub_len, &palg, pub))
665        return 0;
666    EVP_PKEY_assign(pk, OBJ_obj2nid(palgobj), NULL);
667    if (!decode_gost_algor_params(pk, palg))
668        return 0;
669    group = EC_KEY_get0_group(EVP_PKEY_get0(pk));
670    octet = d2i_ASN1_OCTET_STRING(NULL, &pubkey_buf, pub_len);
671    if (!octet) {
672        GOSTerr(GOST_F_PUB_DECODE_GOST01, ERR_R_MALLOC_FAILURE);
673        return 0;
674    }
675    databuf = OPENSSL_malloc(octet->length);
676    for (i = 0, j = octet->length - 1; i < octet->length; i++, j--) {
677        databuf[j] = octet->data[i];
678    }
679    len = octet->length / 2;
680    ASN1_OCTET_STRING_free(octet);
681
682    Y = getbnfrombuf(databuf, len);
683    X = getbnfrombuf(databuf + len, len);
684    OPENSSL_free(databuf);
685    pub_key = EC_POINT_new(group);
686    if (!EC_POINT_set_affine_coordinates_GFp(group, pub_key, X, Y, NULL)) {
687        GOSTerr(GOST_F_PUB_DECODE_GOST01, ERR_R_EC_LIB);
688        EC_POINT_free(pub_key);
689        BN_free(X);
690        BN_free(Y);
691        return 0;
692    }
693    BN_free(X);
694    BN_free(Y);
695    if (!EC_KEY_set_public_key(EVP_PKEY_get0(pk), pub_key)) {
696        GOSTerr(GOST_F_PUB_DECODE_GOST01, ERR_R_EC_LIB);
697        EC_POINT_free(pub_key);
698        return 0;
699    }
700    EC_POINT_free(pub_key);
701    return 1;
702
703}
704
705static int pub_encode_gost01(X509_PUBKEY *pub, const EVP_PKEY *pk)
706{
707    ASN1_OBJECT *algobj = NULL;
708    ASN1_OCTET_STRING *octet = NULL;
709    void *pval = NULL;
710    unsigned char *buf = NULL, *databuf, *sptr;
711    int i, j, data_len, ret = 0;
712    const EC_POINT *pub_key;
713    BIGNUM *X, *Y, *order;
714    const EC_KEY *ec = EVP_PKEY_get0((EVP_PKEY *)pk);
715    int ptype = V_ASN1_UNDEF;
716
717    algobj = OBJ_nid2obj(EVP_PKEY_base_id(pk));
718    if (pk->save_parameters) {
719        ASN1_STRING *params = encode_gost_algor_params(pk);
720        pval = params;
721        ptype = V_ASN1_SEQUENCE;
722    }
723    order = BN_new();
724    EC_GROUP_get_order(EC_KEY_get0_group(ec), order, NULL);
725    pub_key = EC_KEY_get0_public_key(ec);
726    if (!pub_key) {
727        GOSTerr(GOST_F_PUB_ENCODE_GOST01, GOST_R_PUBLIC_KEY_UNDEFINED);
728        return 0;
729    }
730    X = BN_new();
731    Y = BN_new();
732    EC_POINT_get_affine_coordinates_GFp(EC_KEY_get0_group(ec),
733                                        pub_key, X, Y, NULL);
734    data_len = 2 * BN_num_bytes(order);
735    BN_free(order);
736    databuf = OPENSSL_malloc(data_len);
737    memset(databuf, 0, data_len);
738
739    store_bignum(X, databuf + data_len / 2, data_len / 2);
740    store_bignum(Y, databuf, data_len / 2);
741
742    BN_free(X);
743    BN_free(Y);
744    octet = ASN1_OCTET_STRING_new();
745    ASN1_STRING_set(octet, NULL, data_len);
746    sptr = ASN1_STRING_data(octet);
747    for (i = 0, j = data_len - 1; i < data_len; i++, j--) {
748        sptr[i] = databuf[j];
749    }
750    OPENSSL_free(databuf);
751    ret = i2d_ASN1_OCTET_STRING(octet, &buf);
752    ASN1_BIT_STRING_free(octet);
753    if (ret < 0)
754        return 0;
755    return X509_PUBKEY_set0_param(pub, algobj, ptype, pval, buf, ret);
756}
757
758static int pub_cmp_gost94(const EVP_PKEY *a, const EVP_PKEY *b)
759{
760    const DSA *da = EVP_PKEY_get0((EVP_PKEY *)a);
761    const DSA *db = EVP_PKEY_get0((EVP_PKEY *)b);
762    if (da && db && da->pub_key && db->pub_key
763        && !BN_cmp(da->pub_key, db->pub_key)) {
764        return 1;
765    }
766    return 0;
767}
768
769static int pub_cmp_gost01(const EVP_PKEY *a, const EVP_PKEY *b)
770{
771    const EC_KEY *ea = EVP_PKEY_get0((EVP_PKEY *)a);
772    const EC_KEY *eb = EVP_PKEY_get0((EVP_PKEY *)b);
773    const EC_POINT *ka, *kb;
774    int ret = 0;
775    if (!ea || !eb)
776        return 0;
777    ka = EC_KEY_get0_public_key(ea);
778    kb = EC_KEY_get0_public_key(eb);
779    if (!ka || !kb)
780        return 0;
781    ret = (0 == EC_POINT_cmp(EC_KEY_get0_group(ea), ka, kb, NULL));
782    return ret;
783}
784
785static int pkey_size_gost(const EVP_PKEY *pk)
786{
787    return 64;
788}
789
790static int pkey_bits_gost(const EVP_PKEY *pk)
791{
792    return 256;
793}
794
795/* ---------------------- ASN1 METHOD for GOST MAC  -------------------*/
796static void mackey_free_gost(EVP_PKEY *pk)
797{
798    if (pk->pkey.ptr) {
799        OPENSSL_free(pk->pkey.ptr);
800    }
801}
802
803static int mac_ctrl_gost(EVP_PKEY *pkey, int op, long arg1, void *arg2)
804{
805    switch (op) {
806    case ASN1_PKEY_CTRL_DEFAULT_MD_NID:
807        *(int *)arg2 = NID_id_Gost28147_89_MAC;
808        return 2;
809    }
810    return -2;
811}
812
813static int gost94_param_encode(const EVP_PKEY *pkey, unsigned char **pder)
814{
815    int nid = gost94_nid_by_params(EVP_PKEY_get0((EVP_PKEY *)pkey));
816    return i2d_ASN1_OBJECT(OBJ_nid2obj(nid), pder);
817}
818
819static int gost2001_param_encode(const EVP_PKEY *pkey, unsigned char **pder)
820{
821    int nid =
822        EC_GROUP_get_curve_name(EC_KEY_get0_group
823                                (EVP_PKEY_get0((EVP_PKEY *)pkey)));
824    return i2d_ASN1_OBJECT(OBJ_nid2obj(nid), pder);
825}
826
827static int gost94_param_decode(EVP_PKEY *pkey, const unsigned char **pder,
828                               int derlen)
829{
830    ASN1_OBJECT *obj = NULL;
831    DSA *dsa = EVP_PKEY_get0(pkey);
832    int nid;
833    if (d2i_ASN1_OBJECT(&obj, pder, derlen) == NULL) {
834        return 0;
835    }
836    nid = OBJ_obj2nid(obj);
837    ASN1_OBJECT_free(obj);
838    if (!dsa) {
839        dsa = DSA_new();
840        if (!EVP_PKEY_assign(pkey, NID_id_GostR3410_94, dsa))
841            return 0;
842    }
843    if (!fill_GOST94_params(dsa, nid))
844        return 0;
845    return 1;
846}
847
848static int gost2001_param_decode(EVP_PKEY *pkey, const unsigned char **pder,
849                                 int derlen)
850{
851    ASN1_OBJECT *obj = NULL;
852    int nid;
853    EC_KEY *ec = EVP_PKEY_get0(pkey);
854    if (d2i_ASN1_OBJECT(&obj, pder, derlen) == NULL) {
855        return 0;
856    }
857    nid = OBJ_obj2nid(obj);
858    ASN1_OBJECT_free(obj);
859    if (!ec) {
860        ec = EC_KEY_new();
861        if (!EVP_PKEY_assign(pkey, NID_id_GostR3410_2001, ec))
862            return 0;
863    }
864    if (!fill_GOST2001_params(ec, nid))
865        return 0;
866    return 1;
867}
868
869/* ----------------------------------------------------------------------*/
870int register_ameth_gost(int nid, EVP_PKEY_ASN1_METHOD **ameth,
871                        const char *pemstr, const char *info)
872{
873    *ameth = EVP_PKEY_asn1_new(nid, ASN1_PKEY_SIGPARAM_NULL, pemstr, info);
874    if (!*ameth)
875        return 0;
876    switch (nid) {
877    case NID_id_GostR3410_94:
878        EVP_PKEY_asn1_set_free(*ameth, pkey_free_gost94);
879        EVP_PKEY_asn1_set_private(*ameth,
880                                  priv_decode_gost, priv_encode_gost,
881                                  priv_print_gost94);
882
883        EVP_PKEY_asn1_set_param(*ameth,
884                                gost94_param_decode, gost94_param_encode,
885                                param_missing_gost94, param_copy_gost94,
886                                param_cmp_gost94, param_print_gost94);
887        EVP_PKEY_asn1_set_public(*ameth,
888                                 pub_decode_gost94, pub_encode_gost94,
889                                 pub_cmp_gost94, pub_print_gost94,
890                                 pkey_size_gost, pkey_bits_gost);
891
892        EVP_PKEY_asn1_set_ctrl(*ameth, pkey_ctrl_gost);
893        break;
894    case NID_id_GostR3410_2001:
895        EVP_PKEY_asn1_set_free(*ameth, pkey_free_gost01);
896        EVP_PKEY_asn1_set_private(*ameth,
897                                  priv_decode_gost, priv_encode_gost,
898                                  priv_print_gost01);
899
900        EVP_PKEY_asn1_set_param(*ameth,
901                                gost2001_param_decode, gost2001_param_encode,
902                                param_missing_gost01, param_copy_gost01,
903                                param_cmp_gost01, param_print_gost01);
904        EVP_PKEY_asn1_set_public(*ameth,
905                                 pub_decode_gost01, pub_encode_gost01,
906                                 pub_cmp_gost01, pub_print_gost01,
907                                 pkey_size_gost, pkey_bits_gost);
908
909        EVP_PKEY_asn1_set_ctrl(*ameth, pkey_ctrl_gost);
910        break;
911    case NID_id_Gost28147_89_MAC:
912        EVP_PKEY_asn1_set_free(*ameth, mackey_free_gost);
913        EVP_PKEY_asn1_set_ctrl(*ameth, mac_ctrl_gost);
914        break;
915    }
916    return 1;
917}
918