gost_crypt.c revision 296341 
1/**********************************************************************
2 *                          gost_crypt.c                              *
3 *             Copyright (c) 2005-2006 Cryptocom LTD                  *
4 *         This file is distributed under the same license as OpenSSL *
5 *                                                                    *
6 *       OpenSSL interface to GOST 28147-89 cipher functions          *
7 *          Requires OpenSSL 0.9.9 for compilation                    *
8 **********************************************************************/
9#include <string.h>
10#include "gost89.h"
11#include <openssl/rand.h>
12#include "e_gost_err.h"
13#include "gost_lcl.h"
14
15#if !defined(CCGOST_DEBUG) && !defined(DEBUG)
16# ifndef NDEBUG
17#  define NDEBUG
18# endif
19#endif
20#include <assert.h>
21
22static int gost_cipher_init(EVP_CIPHER_CTX *ctx, const unsigned char *key,
23                            const unsigned char *iv, int enc);
24static int gost_cipher_init_cpa(EVP_CIPHER_CTX *ctx, const unsigned char *key,
25                                const unsigned char *iv, int enc);
26/* Handles block of data in CFB mode */
27static int gost_cipher_do_cfb(EVP_CIPHER_CTX *ctx, unsigned char *out,
28                              const unsigned char *in, size_t inl);
29/* Handles block of data in CNT mode */
30static int gost_cipher_do_cnt(EVP_CIPHER_CTX *ctx, unsigned char *out,
31                              const unsigned char *in, size_t inl);
32/* Cleanup function */
33static int gost_cipher_cleanup(EVP_CIPHER_CTX *);
34/* set/get cipher parameters */
35static int gost89_set_asn1_parameters(EVP_CIPHER_CTX *ctx, ASN1_TYPE *params);
36static int gost89_get_asn1_parameters(EVP_CIPHER_CTX *ctx, ASN1_TYPE *params);
37/* Control function */
38static int gost_cipher_ctl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr);
39
40EVP_CIPHER cipher_gost = {
41    NID_id_Gost28147_89,
42    1,                          /* block_size */
43    32,                         /* key_size */
44    8,                          /* iv_len */
45    EVP_CIPH_CFB_MODE | EVP_CIPH_NO_PADDING |
46        EVP_CIPH_CUSTOM_IV | EVP_CIPH_RAND_KEY | EVP_CIPH_ALWAYS_CALL_INIT,
47    gost_cipher_init,
48    gost_cipher_do_cfb,
49    gost_cipher_cleanup,
50    sizeof(struct ossl_gost_cipher_ctx), /* ctx_size */
51    gost89_set_asn1_parameters,
52    gost89_get_asn1_parameters,
53    gost_cipher_ctl,
54    NULL,
55};
56
57EVP_CIPHER cipher_gost_cpacnt = {
58    NID_gost89_cnt,
59    1,                          /* block_size */
60    32,                         /* key_size */
61    8,                          /* iv_len */
62    EVP_CIPH_OFB_MODE | EVP_CIPH_NO_PADDING |
63        EVP_CIPH_CUSTOM_IV | EVP_CIPH_RAND_KEY | EVP_CIPH_ALWAYS_CALL_INIT,
64    gost_cipher_init_cpa,
65    gost_cipher_do_cnt,
66    gost_cipher_cleanup,
67    sizeof(struct ossl_gost_cipher_ctx), /* ctx_size */
68    gost89_set_asn1_parameters,
69    gost89_get_asn1_parameters,
70    gost_cipher_ctl,
71    NULL,
72};
73
74/* Implementation of GOST 28147-89 in MAC (imitovstavka) mode */
75/* Init functions which set specific parameters */
76static int gost_imit_init_cpa(EVP_MD_CTX *ctx);
77/* process block of data */
78static int gost_imit_update(EVP_MD_CTX *ctx, const void *data, size_t count);
79/* Return computed value */
80static int gost_imit_final(EVP_MD_CTX *ctx, unsigned char *md);
81/* Copies context */
82static int gost_imit_copy(EVP_MD_CTX *to, const EVP_MD_CTX *from);
83static int gost_imit_cleanup(EVP_MD_CTX *ctx);
84/* Control function, knows how to set MAC key.*/
85static int gost_imit_ctrl(EVP_MD_CTX *ctx, int type, int arg, void *ptr);
86
87EVP_MD imit_gost_cpa = {
88    NID_id_Gost28147_89_MAC,
89    NID_undef,
90    4,
91    0,
92    gost_imit_init_cpa,
93    gost_imit_update,
94    gost_imit_final,
95    gost_imit_copy,
96    gost_imit_cleanup,
97    NULL,
98    NULL,
99    {0, 0, 0, 0, 0},
100    8,
101    sizeof(struct ossl_gost_imit_ctx),
102    gost_imit_ctrl
103};
104
105/*
106 * Correspondence between gost parameter OIDs and substitution blocks
107 * NID field is filed by register_gost_NID function in engine.c
108 * upon engine initialization
109 */
110
111struct gost_cipher_info gost_cipher_list[] = {
112    /*- NID *//*
113     * Subst block
114     *//*
115     * Key meshing
116     */
117    /*
118     * {NID_id_GostR3411_94_CryptoProParamSet,&GostR3411_94_CryptoProParamSet,0},
119     */
120    {NID_id_Gost28147_89_cc, &GostR3411_94_CryptoProParamSet, 0},
121    {NID_id_Gost28147_89_CryptoPro_A_ParamSet, &Gost28147_CryptoProParamSetA,
122     1},
123    {NID_id_Gost28147_89_CryptoPro_B_ParamSet, &Gost28147_CryptoProParamSetB,
124     1},
125    {NID_id_Gost28147_89_CryptoPro_C_ParamSet, &Gost28147_CryptoProParamSetC,
126     1},
127    {NID_id_Gost28147_89_CryptoPro_D_ParamSet, &Gost28147_CryptoProParamSetD,
128     1},
129    {NID_id_Gost28147_89_TestParamSet, &Gost28147_TestParamSet, 1},
130    {NID_undef, NULL, 0}
131};
132
133/*
134 * get encryption parameters from crypto network settings FIXME For now we
135 * use environment var CRYPT_PARAMS as place to store these settings.
136 * Actually, it is better to use engine control command, read from
137 * configuration file to set them
138 */
139const struct gost_cipher_info *get_encryption_params(ASN1_OBJECT *obj)
140{
141    int nid;
142    struct gost_cipher_info *param;
143    if (!obj) {
144        const char *params = get_gost_engine_param(GOST_PARAM_CRYPT_PARAMS);
145        if (!params || !strlen(params))
146            return &gost_cipher_list[1];
147
148        nid = OBJ_txt2nid(params);
149        if (nid == NID_undef) {
150            GOSTerr(GOST_F_GET_ENCRYPTION_PARAMS,
151                    GOST_R_INVALID_CIPHER_PARAM_OID);
152            return NULL;
153        }
154    } else {
155        nid = OBJ_obj2nid(obj);
156    }
157    for (param = gost_cipher_list; param->sblock != NULL && param->nid != nid;
158         param++) ;
159    if (!param->sblock) {
160        GOSTerr(GOST_F_GET_ENCRYPTION_PARAMS, GOST_R_INVALID_CIPHER_PARAMS);
161        return NULL;
162    }
163    return param;
164}
165
166/* Sets cipher param from paramset NID. */
167static int gost_cipher_set_param(struct ossl_gost_cipher_ctx *c, int nid)
168{
169    const struct gost_cipher_info *param;
170    param =
171        get_encryption_params((nid == NID_undef ? NULL : OBJ_nid2obj(nid)));
172    if (!param)
173        return 0;
174
175    c->paramNID = param->nid;
176    c->key_meshing = param->key_meshing;
177    c->count = 0;
178    gost_init(&(c->cctx), param->sblock);
179    return 1;
180}
181
182/* Initializes EVP_CIPHER_CTX by paramset NID */
183static int gost_cipher_init_param(EVP_CIPHER_CTX *ctx,
184                                  const unsigned char *key,
185                                  const unsigned char *iv, int enc,
186                                  int paramNID, int mode)
187{
188    struct ossl_gost_cipher_ctx *c = ctx->cipher_data;
189    if (ctx->app_data == NULL) {
190        if (!gost_cipher_set_param(c, paramNID))
191            return 0;
192        ctx->app_data = ctx->cipher_data;
193    }
194    if (key)
195        gost_key(&(c->cctx), key);
196    if (iv)
197        memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx));
198    memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx));
199    return 1;
200}
201
202static int gost_cipher_init_cpa(EVP_CIPHER_CTX *ctx, const unsigned char *key,
203                                const unsigned char *iv, int enc)
204{
205    struct ossl_gost_cipher_ctx *c = ctx->cipher_data;
206    gost_init(&(c->cctx), &Gost28147_CryptoProParamSetA);
207    c->key_meshing = 1;
208    c->count = 0;
209    if (key)
210        gost_key(&(c->cctx), key);
211    if (iv)
212        memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx));
213    memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx));
214    return 1;
215}
216
217/* Initializes EVP_CIPHER_CTX with default values */
218int gost_cipher_init(EVP_CIPHER_CTX *ctx, const unsigned char *key,
219                     const unsigned char *iv, int enc)
220{
221    return gost_cipher_init_param(ctx, key, iv, enc, NID_undef,
222                                  EVP_CIPH_CFB_MODE);
223}
224
225/*
226 * Wrapper around gostcrypt function from gost89.c which perform key meshing
227 * when nesseccary
228 */
229static void gost_crypt_mesh(void *ctx, unsigned char *iv, unsigned char *buf)
230{
231    struct ossl_gost_cipher_ctx *c = ctx;
232    assert(c->count % 8 == 0 && c->count <= 1024);
233    if (c->key_meshing && c->count == 1024) {
234        cryptopro_key_meshing(&(c->cctx), iv);
235    }
236    gostcrypt(&(c->cctx), iv, buf);
237    c->count = c->count % 1024 + 8;
238}
239
240static void gost_cnt_next(void *ctx, unsigned char *iv, unsigned char *buf)
241{
242    struct ossl_gost_cipher_ctx *c = ctx;
243    word32 g, go;
244    unsigned char buf1[8];
245    assert(c->count % 8 == 0 && c->count <= 1024);
246    if (c->key_meshing && c->count == 1024) {
247        cryptopro_key_meshing(&(c->cctx), iv);
248    }
249    if (c->count == 0) {
250        gostcrypt(&(c->cctx), iv, buf1);
251    } else {
252        memcpy(buf1, iv, 8);
253    }
254    g = buf1[0] | (buf1[1] << 8) | (buf1[2] << 16) | (buf1[3] << 24);
255    g += 0x01010101;
256    buf1[0] = (unsigned char)(g & 0xff);
257    buf1[1] = (unsigned char)((g >> 8) & 0xff);
258    buf1[2] = (unsigned char)((g >> 16) & 0xff);
259    buf1[3] = (unsigned char)((g >> 24) & 0xff);
260    g = buf1[4] | (buf1[5] << 8) | (buf1[6] << 16) | (buf1[7] << 24);
261    go = g;
262    g += 0x01010104;
263    if (go > g)                 /* overflow */
264        g++;
265    buf1[4] = (unsigned char)(g & 0xff);
266    buf1[5] = (unsigned char)((g >> 8) & 0xff);
267    buf1[6] = (unsigned char)((g >> 16) & 0xff);
268    buf1[7] = (unsigned char)((g >> 24) & 0xff);
269    memcpy(iv, buf1, 8);
270    gostcrypt(&(c->cctx), buf1, buf);
271    c->count = c->count % 1024 + 8;
272}
273
274/* GOST encryption in CFB mode */
275int gost_cipher_do_cfb(EVP_CIPHER_CTX *ctx, unsigned char *out,
276                       const unsigned char *in, size_t inl)
277{
278    const unsigned char *in_ptr = in;
279    unsigned char *out_ptr = out;
280    size_t i = 0;
281    size_t j = 0;
282/* process partial block if any */
283    if (ctx->num) {
284        for (j = ctx->num, i = 0; j < 8 && i < inl;
285             j++, i++, in_ptr++, out_ptr++) {
286            if (!ctx->encrypt)
287                ctx->buf[j + 8] = *in_ptr;
288            *out_ptr = ctx->buf[j] ^ (*in_ptr);
289            if (ctx->encrypt)
290                ctx->buf[j + 8] = *out_ptr;
291        }
292        if (j == 8) {
293            memcpy(ctx->iv, ctx->buf + 8, 8);
294            ctx->num = 0;
295        } else {
296            ctx->num = j;
297            return 1;
298        }
299    }
300
301    for (; i + 8 < inl; i += 8, in_ptr += 8, out_ptr += 8) {
302        /*
303         * block cipher current iv
304         */
305        gost_crypt_mesh(ctx->cipher_data, ctx->iv, ctx->buf);
306        /*
307         * xor next block of input text with it and output it
308         */
309        /*
310         * output this block
311         */
312        if (!ctx->encrypt)
313            memcpy(ctx->iv, in_ptr, 8);
314        for (j = 0; j < 8; j++) {
315            out_ptr[j] = ctx->buf[j] ^ in_ptr[j];
316        }
317        /* Encrypt */
318        /* Next iv is next block of cipher text */
319        if (ctx->encrypt)
320            memcpy(ctx->iv, out_ptr, 8);
321    }
322/* Process rest of buffer */
323    if (i < inl) {
324        gost_crypt_mesh(ctx->cipher_data, ctx->iv, ctx->buf);
325        if (!ctx->encrypt)
326            memcpy(ctx->buf + 8, in_ptr, inl - i);
327        for (j = 0; i < inl; j++, i++) {
328            out_ptr[j] = ctx->buf[j] ^ in_ptr[j];
329        }
330        ctx->num = j;
331        if (ctx->encrypt)
332            memcpy(ctx->buf + 8, out_ptr, j);
333    } else {
334        ctx->num = 0;
335    }
336    return 1;
337}
338
339static int gost_cipher_do_cnt(EVP_CIPHER_CTX *ctx, unsigned char *out,
340                              const unsigned char *in, size_t inl)
341{
342    const unsigned char *in_ptr = in;
343    unsigned char *out_ptr = out;
344    size_t i = 0;
345    size_t j;
346/* process partial block if any */
347    if (ctx->num) {
348        for (j = ctx->num, i = 0; j < 8 && i < inl;
349             j++, i++, in_ptr++, out_ptr++) {
350            *out_ptr = ctx->buf[j] ^ (*in_ptr);
351        }
352        if (j == 8) {
353            ctx->num = 0;
354        } else {
355            ctx->num = j;
356            return 1;
357        }
358    }
359
360    for (; i + 8 < inl; i += 8, in_ptr += 8, out_ptr += 8) {
361        /*
362         * block cipher current iv
363         */
364        /* Encrypt */
365        gost_cnt_next(ctx->cipher_data, ctx->iv, ctx->buf);
366        /*
367         * xor next block of input text with it and output it
368         */
369        /*
370         * output this block
371         */
372        for (j = 0; j < 8; j++) {
373            out_ptr[j] = ctx->buf[j] ^ in_ptr[j];
374        }
375    }
376/* Process rest of buffer */
377    if (i < inl) {
378        gost_cnt_next(ctx->cipher_data, ctx->iv, ctx->buf);
379        for (j = 0; i < inl; j++, i++) {
380            out_ptr[j] = ctx->buf[j] ^ in_ptr[j];
381        }
382        ctx->num = j;
383    } else {
384        ctx->num = 0;
385    }
386    return 1;
387}
388
389/* Cleaning up of EVP_CIPHER_CTX */
390int gost_cipher_cleanup(EVP_CIPHER_CTX *ctx)
391{
392    gost_destroy(&((struct ossl_gost_cipher_ctx *)ctx->cipher_data)->cctx);
393    ctx->app_data = NULL;
394    return 1;
395}
396
397/* Control function for gost cipher */
398int gost_cipher_ctl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr)
399{
400    switch (type) {
401    case EVP_CTRL_RAND_KEY:
402        {
403            if (RAND_bytes((unsigned char *)ptr, ctx->key_len) <= 0) {
404                GOSTerr(GOST_F_GOST_CIPHER_CTL,
405                        GOST_R_RANDOM_GENERATOR_ERROR);
406                return -1;
407            }
408            break;
409        }
410    case EVP_CTRL_PBE_PRF_NID:
411        if (ptr) {
412            *((int *)ptr) = NID_id_HMACGostR3411_94;
413            return 1;
414        } else {
415            return 0;
416        }
417
418    default:
419        GOSTerr(GOST_F_GOST_CIPHER_CTL,
420                GOST_R_UNSUPPORTED_CIPHER_CTL_COMMAND);
421        return -1;
422    }
423    return 1;
424}
425
426/* Set cipher parameters from ASN1 structure */
427int gost89_set_asn1_parameters(EVP_CIPHER_CTX *ctx, ASN1_TYPE *params)
428{
429    int len = 0;
430    unsigned char *buf = NULL;
431    unsigned char *p = NULL;
432    struct ossl_gost_cipher_ctx *c = ctx->cipher_data;
433    GOST_CIPHER_PARAMS *gcp = GOST_CIPHER_PARAMS_new();
434    ASN1_OCTET_STRING *os = NULL;
435    if (!gcp) {
436        GOSTerr(GOST_F_GOST89_SET_ASN1_PARAMETERS, GOST_R_NO_MEMORY);
437        return 0;
438    }
439    if (!ASN1_OCTET_STRING_set(gcp->iv, ctx->iv, ctx->cipher->iv_len)) {
440        GOST_CIPHER_PARAMS_free(gcp);
441        GOSTerr(GOST_F_GOST89_SET_ASN1_PARAMETERS, GOST_R_NO_MEMORY);
442        return 0;
443    }
444    ASN1_OBJECT_free(gcp->enc_param_set);
445    gcp->enc_param_set = OBJ_nid2obj(c->paramNID);
446
447    len = i2d_GOST_CIPHER_PARAMS(gcp, NULL);
448    p = buf = (unsigned char *)OPENSSL_malloc(len);
449    if (!buf) {
450        GOST_CIPHER_PARAMS_free(gcp);
451        GOSTerr(GOST_F_GOST89_SET_ASN1_PARAMETERS, GOST_R_NO_MEMORY);
452        return 0;
453    }
454    i2d_GOST_CIPHER_PARAMS(gcp, &p);
455    GOST_CIPHER_PARAMS_free(gcp);
456
457    os = ASN1_OCTET_STRING_new();
458
459    if (!os || !ASN1_OCTET_STRING_set(os, buf, len)) {
460        OPENSSL_free(buf);
461        GOSTerr(GOST_F_GOST89_SET_ASN1_PARAMETERS, GOST_R_NO_MEMORY);
462        return 0;
463    }
464    OPENSSL_free(buf);
465
466    ASN1_TYPE_set(params, V_ASN1_SEQUENCE, os);
467    return 1;
468}
469
470/* Store parameters into ASN1 structure */
471int gost89_get_asn1_parameters(EVP_CIPHER_CTX *ctx, ASN1_TYPE *params)
472{
473    int ret = -1;
474    int len;
475    GOST_CIPHER_PARAMS *gcp = NULL;
476    unsigned char *p;
477    struct ossl_gost_cipher_ctx *c = ctx->cipher_data;
478    if (ASN1_TYPE_get(params) != V_ASN1_SEQUENCE) {
479        return ret;
480    }
481
482    p = params->value.sequence->data;
483
484    gcp = d2i_GOST_CIPHER_PARAMS(NULL, (const unsigned char **)&p,
485                                 params->value.sequence->length);
486
487    len = gcp->iv->length;
488    if (len != ctx->cipher->iv_len) {
489        GOST_CIPHER_PARAMS_free(gcp);
490        GOSTerr(GOST_F_GOST89_GET_ASN1_PARAMETERS, GOST_R_INVALID_IV_LENGTH);
491        return -1;
492    }
493    if (!gost_cipher_set_param(c, OBJ_obj2nid(gcp->enc_param_set))) {
494        GOST_CIPHER_PARAMS_free(gcp);
495        return -1;
496    }
497    memcpy(ctx->oiv, gcp->iv->data, len);
498
499    GOST_CIPHER_PARAMS_free(gcp);
500
501    return 1;
502}
503
504int gost_imit_init_cpa(EVP_MD_CTX *ctx)
505{
506    struct ossl_gost_imit_ctx *c = ctx->md_data;
507    memset(c->buffer, 0, sizeof(c->buffer));
508    memset(c->partial_block, 0, sizeof(c->partial_block));
509    c->count = 0;
510    c->bytes_left = 0;
511    c->key_meshing = 1;
512    gost_init(&(c->cctx), &Gost28147_CryptoProParamSetA);
513    return 1;
514}
515
516static void mac_block_mesh(struct ossl_gost_imit_ctx *c,
517                           const unsigned char *data)
518{
519    unsigned char buffer[8];
520    /*
521     * We are using local buffer for iv because CryptoPro doesn't interpret
522     * internal state of MAC algorithm as iv during keymeshing (but does
523     * initialize internal state from iv in key transport
524     */
525    assert(c->count % 8 == 0 && c->count <= 1024);
526    if (c->key_meshing && c->count == 1024) {
527        cryptopro_key_meshing(&(c->cctx), buffer);
528    }
529    mac_block(&(c->cctx), c->buffer, data);
530    c->count = c->count % 1024 + 8;
531}
532
533int gost_imit_update(EVP_MD_CTX *ctx, const void *data, size_t count)
534{
535    struct ossl_gost_imit_ctx *c = ctx->md_data;
536    const unsigned char *p = data;
537    size_t bytes = count, i;
538    if (!(c->key_set)) {
539        GOSTerr(GOST_F_GOST_IMIT_UPDATE, GOST_R_MAC_KEY_NOT_SET);
540        return 0;
541    }
542    if (c->bytes_left) {
543        for (i = c->bytes_left; i < 8 && bytes > 0; bytes--, i++, p++) {
544            c->partial_block[i] = *p;
545        }
546        if (i == 8) {
547            mac_block_mesh(c, c->partial_block);
548        } else {
549            c->bytes_left = i;
550            return 1;
551        }
552    }
553    while (bytes > 8) {
554        mac_block_mesh(c, p);
555        p += 8;
556        bytes -= 8;
557    }
558    if (bytes > 0) {
559        memcpy(c->partial_block, p, bytes);
560    }
561    c->bytes_left = bytes;
562    return 1;
563}
564
565int gost_imit_final(EVP_MD_CTX *ctx, unsigned char *md)
566{
567    struct ossl_gost_imit_ctx *c = ctx->md_data;
568    if (!c->key_set) {
569        GOSTerr(GOST_F_GOST_IMIT_FINAL, GOST_R_MAC_KEY_NOT_SET);
570        return 0;
571    }
572    if (c->count == 0 && c->bytes_left) {
573        unsigned char buffer[8];
574        memset(buffer, 0, 8);
575        gost_imit_update(ctx, buffer, 8);
576    }
577    if (c->bytes_left) {
578        int i;
579        for (i = c->bytes_left; i < 8; i++) {
580            c->partial_block[i] = 0;
581        }
582        mac_block_mesh(c, c->partial_block);
583    }
584    get_mac(c->buffer, 32, md);
585    return 1;
586}
587
588int gost_imit_ctrl(EVP_MD_CTX *ctx, int type, int arg, void *ptr)
589{
590    switch (type) {
591    case EVP_MD_CTRL_KEY_LEN:
592        *((unsigned int *)(ptr)) = 32;
593        return 1;
594    case EVP_MD_CTRL_SET_KEY:
595        {
596            if (arg != 32) {
597                GOSTerr(GOST_F_GOST_IMIT_CTRL, GOST_R_INVALID_MAC_KEY_LENGTH);
598                return 0;
599            }
600
601            gost_key(&(((struct ossl_gost_imit_ctx *)(ctx->md_data))->cctx),
602                     ptr);
603            ((struct ossl_gost_imit_ctx *)(ctx->md_data))->key_set = 1;
604            return 1;
605
606        }
607    default:
608        return 0;
609    }
610}
611
612int gost_imit_copy(EVP_MD_CTX *to, const EVP_MD_CTX *from)
613{
614    memcpy(to->md_data, from->md_data, sizeof(struct ossl_gost_imit_ctx));
615    return 1;
616}
617
618/* Clean up imit ctx */
619int gost_imit_cleanup(EVP_MD_CTX *ctx)
620{
621    memset(ctx->md_data, 0, sizeof(struct ossl_gost_imit_ctx));
622    return 1;
623}
624