1/*
2 * Copyright 2020-2021 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the Apache License 2.0 (the "License").  You may not use
5 * this file except in compliance with the License.  You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10/*
11 * ECDSA low level APIs are deprecated for public use, but still ok for
12 * internal use.
13 */
14#include "internal/deprecated.h"
15
16#include <string.h> /* memcpy */
17#include <openssl/crypto.h>
18#include <openssl/core_dispatch.h>
19#include <openssl/core_names.h>
20#include <openssl/dsa.h>
21#include <openssl/params.h>
22#include <openssl/evp.h>
23#include <openssl/err.h>
24#include <openssl/proverr.h>
25#include "internal/nelem.h"
26#include "internal/sizes.h"
27#include "internal/cryptlib.h"
28#include "prov/providercommon.h"
29#include "prov/implementations.h"
30#include "prov/provider_ctx.h"
31#include "prov/securitycheck.h"
32#include "crypto/ec.h"
33#include "prov/der_ec.h"
34
35static OSSL_FUNC_signature_newctx_fn ecdsa_newctx;
36static OSSL_FUNC_signature_sign_init_fn ecdsa_sign_init;
37static OSSL_FUNC_signature_verify_init_fn ecdsa_verify_init;
38static OSSL_FUNC_signature_sign_fn ecdsa_sign;
39static OSSL_FUNC_signature_verify_fn ecdsa_verify;
40static OSSL_FUNC_signature_digest_sign_init_fn ecdsa_digest_sign_init;
41static OSSL_FUNC_signature_digest_sign_update_fn ecdsa_digest_signverify_update;
42static OSSL_FUNC_signature_digest_sign_final_fn ecdsa_digest_sign_final;
43static OSSL_FUNC_signature_digest_verify_init_fn ecdsa_digest_verify_init;
44static OSSL_FUNC_signature_digest_verify_update_fn ecdsa_digest_signverify_update;
45static OSSL_FUNC_signature_digest_verify_final_fn ecdsa_digest_verify_final;
46static OSSL_FUNC_signature_freectx_fn ecdsa_freectx;
47static OSSL_FUNC_signature_dupctx_fn ecdsa_dupctx;
48static OSSL_FUNC_signature_get_ctx_params_fn ecdsa_get_ctx_params;
49static OSSL_FUNC_signature_gettable_ctx_params_fn ecdsa_gettable_ctx_params;
50static OSSL_FUNC_signature_set_ctx_params_fn ecdsa_set_ctx_params;
51static OSSL_FUNC_signature_settable_ctx_params_fn ecdsa_settable_ctx_params;
52static OSSL_FUNC_signature_get_ctx_md_params_fn ecdsa_get_ctx_md_params;
53static OSSL_FUNC_signature_gettable_ctx_md_params_fn ecdsa_gettable_ctx_md_params;
54static OSSL_FUNC_signature_set_ctx_md_params_fn ecdsa_set_ctx_md_params;
55static OSSL_FUNC_signature_settable_ctx_md_params_fn ecdsa_settable_ctx_md_params;
56
57/*
58 * What's passed as an actual key is defined by the KEYMGMT interface.
59 * We happen to know that our KEYMGMT simply passes DSA structures, so
60 * we use that here too.
61 */
62
63typedef struct {
64    OSSL_LIB_CTX *libctx;
65    char *propq;
66    EC_KEY *ec;
67    char mdname[OSSL_MAX_NAME_SIZE];
68
69    /*
70     * Flag to determine if the hash function can be changed (1) or not (0)
71     * Because it's dangerous to change during a DigestSign or DigestVerify
72     * operation, this flag is cleared by their Init function, and set again
73     * by their Final function.
74     */
75    unsigned int flag_allow_md : 1;
76
77    /* The Algorithm Identifier of the combined signature algorithm */
78    unsigned char aid_buf[OSSL_MAX_ALGORITHM_ID_SIZE];
79    unsigned char *aid;
80    size_t  aid_len;
81    size_t mdsize;
82    int operation;
83
84    EVP_MD *md;
85    EVP_MD_CTX *mdctx;
86    /*
87     * Internally used to cache the results of calling the EC group
88     * sign_setup() methods which are then passed to the sign operation.
89     * This is used by CAVS failure tests to terminate a loop if the signature
90     * is not valid.
91     * This could of also been done with a simple flag.
92     */
93    BIGNUM *kinv;
94    BIGNUM *r;
95#if !defined(OPENSSL_NO_ACVP_TESTS)
96    /*
97     * This indicates that KAT (CAVS) test is running. Externally an app will
98     * override the random callback such that the generated private key and k
99     * are known.
100     * Normal operation will loop to choose a new k if the signature is not
101     * valid - but for this mode of operation it forces a failure instead.
102     */
103    unsigned int kattest;
104#endif
105} PROV_ECDSA_CTX;
106
107static void *ecdsa_newctx(void *provctx, const char *propq)
108{
109    PROV_ECDSA_CTX *ctx;
110
111    if (!ossl_prov_is_running())
112        return NULL;
113
114    ctx = OPENSSL_zalloc(sizeof(PROV_ECDSA_CTX));
115    if (ctx == NULL)
116        return NULL;
117
118    ctx->flag_allow_md = 1;
119    ctx->libctx = PROV_LIBCTX_OF(provctx);
120    if (propq != NULL && (ctx->propq = OPENSSL_strdup(propq)) == NULL) {
121        OPENSSL_free(ctx);
122        ctx = NULL;
123        ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE);
124    }
125    return ctx;
126}
127
128static int ecdsa_signverify_init(void *vctx, void *ec,
129                                 const OSSL_PARAM params[], int operation)
130{
131    PROV_ECDSA_CTX *ctx = (PROV_ECDSA_CTX *)vctx;
132
133    if (!ossl_prov_is_running()
134            || ctx == NULL)
135        return 0;
136
137    if (ec == NULL && ctx->ec == NULL) {
138        ERR_raise(ERR_LIB_PROV, PROV_R_NO_KEY_SET);
139        return 0;
140    }
141
142    if (ec != NULL) {
143        if (!ossl_ec_check_key(ctx->libctx, ec, operation == EVP_PKEY_OP_SIGN))
144            return 0;
145        if (!EC_KEY_up_ref(ec))
146            return 0;
147        EC_KEY_free(ctx->ec);
148        ctx->ec = ec;
149    }
150
151    ctx->operation = operation;
152
153    if (!ecdsa_set_ctx_params(ctx, params))
154        return 0;
155
156    return 1;
157}
158
159static int ecdsa_sign_init(void *vctx, void *ec, const OSSL_PARAM params[])
160{
161    return ecdsa_signverify_init(vctx, ec, params, EVP_PKEY_OP_SIGN);
162}
163
164static int ecdsa_verify_init(void *vctx, void *ec, const OSSL_PARAM params[])
165{
166    return ecdsa_signverify_init(vctx, ec, params, EVP_PKEY_OP_VERIFY);
167}
168
169static int ecdsa_sign(void *vctx, unsigned char *sig, size_t *siglen,
170                      size_t sigsize, const unsigned char *tbs, size_t tbslen)
171{
172    PROV_ECDSA_CTX *ctx = (PROV_ECDSA_CTX *)vctx;
173    int ret;
174    unsigned int sltmp;
175    size_t ecsize = ECDSA_size(ctx->ec);
176
177    if (!ossl_prov_is_running())
178        return 0;
179
180    if (sig == NULL) {
181        *siglen = ecsize;
182        return 1;
183    }
184
185#if !defined(OPENSSL_NO_ACVP_TESTS)
186    if (ctx->kattest && !ECDSA_sign_setup(ctx->ec, NULL, &ctx->kinv, &ctx->r))
187        return 0;
188#endif
189
190    if (sigsize < (size_t)ecsize)
191        return 0;
192
193    if (ctx->mdsize != 0 && tbslen != ctx->mdsize)
194        return 0;
195
196    ret = ECDSA_sign_ex(0, tbs, tbslen, sig, &sltmp, ctx->kinv, ctx->r, ctx->ec);
197    if (ret <= 0)
198        return 0;
199
200    *siglen = sltmp;
201    return 1;
202}
203
204static int ecdsa_verify(void *vctx, const unsigned char *sig, size_t siglen,
205                        const unsigned char *tbs, size_t tbslen)
206{
207    PROV_ECDSA_CTX *ctx = (PROV_ECDSA_CTX *)vctx;
208
209    if (!ossl_prov_is_running() || (ctx->mdsize != 0 && tbslen != ctx->mdsize))
210        return 0;
211
212    return ECDSA_verify(0, tbs, tbslen, sig, siglen, ctx->ec);
213}
214
215static int ecdsa_setup_md(PROV_ECDSA_CTX *ctx, const char *mdname,
216                          const char *mdprops)
217{
218    EVP_MD *md = NULL;
219    size_t mdname_len;
220    int md_nid, sha1_allowed;
221    WPACKET pkt;
222
223    if (mdname == NULL)
224        return 1;
225
226    mdname_len = strlen(mdname);
227    if (mdname_len >= sizeof(ctx->mdname)) {
228        ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_DIGEST,
229                       "%s exceeds name buffer length", mdname);
230        return 0;
231    }
232    if (mdprops == NULL)
233        mdprops = ctx->propq;
234    md = EVP_MD_fetch(ctx->libctx, mdname, mdprops);
235    if (md == NULL) {
236        ERR_raise_data(ERR_LIB_PROV, PROV_R_INVALID_DIGEST,
237                       "%s could not be fetched", mdname);
238        return 0;
239    }
240    sha1_allowed = (ctx->operation != EVP_PKEY_OP_SIGN);
241    md_nid = ossl_digest_get_approved_nid_with_sha1(ctx->libctx, md,
242                                                    sha1_allowed);
243    if (md_nid < 0) {
244        ERR_raise_data(ERR_LIB_PROV, PROV_R_DIGEST_NOT_ALLOWED,
245                       "digest=%s", mdname);
246        EVP_MD_free(md);
247        return 0;
248    }
249
250    if (!ctx->flag_allow_md) {
251        if (ctx->mdname[0] != '\0' && !EVP_MD_is_a(md, ctx->mdname)) {
252            ERR_raise_data(ERR_LIB_PROV, PROV_R_DIGEST_NOT_ALLOWED,
253                           "digest %s != %s", mdname, ctx->mdname);
254            EVP_MD_free(md);
255            return 0;
256        }
257        EVP_MD_free(md);
258        return 1;
259    }
260
261    EVP_MD_CTX_free(ctx->mdctx);
262    EVP_MD_free(ctx->md);
263
264    ctx->aid_len = 0;
265    if (WPACKET_init_der(&pkt, ctx->aid_buf, sizeof(ctx->aid_buf))
266        && ossl_DER_w_algorithmIdentifier_ECDSA_with_MD(&pkt, -1, ctx->ec,
267                                                        md_nid)
268        && WPACKET_finish(&pkt)) {
269        WPACKET_get_total_written(&pkt, &ctx->aid_len);
270        ctx->aid = WPACKET_get_curr(&pkt);
271    }
272    WPACKET_cleanup(&pkt);
273    ctx->mdctx = NULL;
274    ctx->md = md;
275    ctx->mdsize = EVP_MD_get_size(ctx->md);
276    OPENSSL_strlcpy(ctx->mdname, mdname, sizeof(ctx->mdname));
277
278    return 1;
279}
280
281static int ecdsa_digest_signverify_init(void *vctx, const char *mdname,
282                                        void *ec, const OSSL_PARAM params[],
283                                        int operation)
284{
285    PROV_ECDSA_CTX *ctx = (PROV_ECDSA_CTX *)vctx;
286
287    if (!ossl_prov_is_running())
288        return 0;
289
290    if (!ecdsa_signverify_init(vctx, ec, params, operation)
291        || !ecdsa_setup_md(ctx, mdname, NULL))
292        return 0;
293
294    ctx->flag_allow_md = 0;
295
296    if (ctx->mdctx == NULL) {
297        ctx->mdctx = EVP_MD_CTX_new();
298        if (ctx->mdctx == NULL)
299            goto error;
300    }
301
302    if (!EVP_DigestInit_ex2(ctx->mdctx, ctx->md, params))
303        goto error;
304    return 1;
305error:
306    EVP_MD_CTX_free(ctx->mdctx);
307    ctx->mdctx = NULL;
308    return 0;
309}
310
311static int ecdsa_digest_sign_init(void *vctx, const char *mdname, void *ec,
312                                  const OSSL_PARAM params[])
313{
314    return ecdsa_digest_signverify_init(vctx, mdname, ec, params,
315                                        EVP_PKEY_OP_SIGN);
316}
317
318static int ecdsa_digest_verify_init(void *vctx, const char *mdname, void *ec,
319                                    const OSSL_PARAM params[])
320{
321    return ecdsa_digest_signverify_init(vctx, mdname, ec, params,
322                                        EVP_PKEY_OP_VERIFY);
323}
324
325int ecdsa_digest_signverify_update(void *vctx, const unsigned char *data,
326                                   size_t datalen)
327{
328    PROV_ECDSA_CTX *ctx = (PROV_ECDSA_CTX *)vctx;
329
330    if (ctx == NULL || ctx->mdctx == NULL)
331        return 0;
332
333    return EVP_DigestUpdate(ctx->mdctx, data, datalen);
334}
335
336int ecdsa_digest_sign_final(void *vctx, unsigned char *sig, size_t *siglen,
337                            size_t sigsize)
338{
339    PROV_ECDSA_CTX *ctx = (PROV_ECDSA_CTX *)vctx;
340    unsigned char digest[EVP_MAX_MD_SIZE];
341    unsigned int dlen = 0;
342
343    if (!ossl_prov_is_running() || ctx == NULL || ctx->mdctx == NULL)
344        return 0;
345
346    /*
347     * If sig is NULL then we're just finding out the sig size. Other fields
348     * are ignored. Defer to ecdsa_sign.
349     */
350    if (sig != NULL
351        && !EVP_DigestFinal_ex(ctx->mdctx, digest, &dlen))
352        return 0;
353    ctx->flag_allow_md = 1;
354    return ecdsa_sign(vctx, sig, siglen, sigsize, digest, (size_t)dlen);
355}
356
357int ecdsa_digest_verify_final(void *vctx, const unsigned char *sig,
358                              size_t siglen)
359{
360    PROV_ECDSA_CTX *ctx = (PROV_ECDSA_CTX *)vctx;
361    unsigned char digest[EVP_MAX_MD_SIZE];
362    unsigned int dlen = 0;
363
364    if (!ossl_prov_is_running() || ctx == NULL || ctx->mdctx == NULL)
365        return 0;
366
367    if (!EVP_DigestFinal_ex(ctx->mdctx, digest, &dlen))
368        return 0;
369    ctx->flag_allow_md = 1;
370    return ecdsa_verify(ctx, sig, siglen, digest, (size_t)dlen);
371}
372
373static void ecdsa_freectx(void *vctx)
374{
375    PROV_ECDSA_CTX *ctx = (PROV_ECDSA_CTX *)vctx;
376
377    OPENSSL_free(ctx->propq);
378    EVP_MD_CTX_free(ctx->mdctx);
379    EVP_MD_free(ctx->md);
380    ctx->propq = NULL;
381    ctx->mdctx = NULL;
382    ctx->md = NULL;
383    ctx->mdsize = 0;
384    EC_KEY_free(ctx->ec);
385    BN_clear_free(ctx->kinv);
386    BN_clear_free(ctx->r);
387    OPENSSL_free(ctx);
388}
389
390static void *ecdsa_dupctx(void *vctx)
391{
392    PROV_ECDSA_CTX *srcctx = (PROV_ECDSA_CTX *)vctx;
393    PROV_ECDSA_CTX *dstctx;
394
395    if (!ossl_prov_is_running())
396        return NULL;
397
398    dstctx = OPENSSL_zalloc(sizeof(*srcctx));
399    if (dstctx == NULL)
400        return NULL;
401
402    *dstctx = *srcctx;
403    dstctx->ec = NULL;
404    dstctx->md = NULL;
405    dstctx->mdctx = NULL;
406    dstctx->propq = NULL;
407
408    if (srcctx->ec != NULL && !EC_KEY_up_ref(srcctx->ec))
409        goto err;
410    /* Test KATS should not need to be supported */
411    if (srcctx->kinv != NULL || srcctx->r != NULL)
412        goto err;
413    dstctx->ec = srcctx->ec;
414
415    if (srcctx->md != NULL && !EVP_MD_up_ref(srcctx->md))
416        goto err;
417    dstctx->md = srcctx->md;
418
419    if (srcctx->mdctx != NULL) {
420        dstctx->mdctx = EVP_MD_CTX_new();
421        if (dstctx->mdctx == NULL
422                || !EVP_MD_CTX_copy_ex(dstctx->mdctx, srcctx->mdctx))
423            goto err;
424    }
425
426    if (srcctx->propq != NULL) {
427        dstctx->propq = OPENSSL_strdup(srcctx->propq);
428        if (dstctx->propq == NULL)
429            goto err;
430    }
431
432    return dstctx;
433 err:
434    ecdsa_freectx(dstctx);
435    return NULL;
436}
437
438static int ecdsa_get_ctx_params(void *vctx, OSSL_PARAM *params)
439{
440    PROV_ECDSA_CTX *ctx = (PROV_ECDSA_CTX *)vctx;
441    OSSL_PARAM *p;
442
443    if (ctx == NULL)
444        return 0;
445
446    p = OSSL_PARAM_locate(params, OSSL_SIGNATURE_PARAM_ALGORITHM_ID);
447    if (p != NULL && !OSSL_PARAM_set_octet_string(p, ctx->aid, ctx->aid_len))
448        return 0;
449
450    p = OSSL_PARAM_locate(params, OSSL_SIGNATURE_PARAM_DIGEST_SIZE);
451    if (p != NULL && !OSSL_PARAM_set_size_t(p, ctx->mdsize))
452        return 0;
453
454    p = OSSL_PARAM_locate(params, OSSL_SIGNATURE_PARAM_DIGEST);
455    if (p != NULL && !OSSL_PARAM_set_utf8_string(p, ctx->md == NULL
456                                                    ? ctx->mdname
457                                                    : EVP_MD_get0_name(ctx->md)))
458        return 0;
459
460    return 1;
461}
462
463static const OSSL_PARAM known_gettable_ctx_params[] = {
464    OSSL_PARAM_octet_string(OSSL_SIGNATURE_PARAM_ALGORITHM_ID, NULL, 0),
465    OSSL_PARAM_size_t(OSSL_SIGNATURE_PARAM_DIGEST_SIZE, NULL),
466    OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_DIGEST, NULL, 0),
467    OSSL_PARAM_END
468};
469
470static const OSSL_PARAM *ecdsa_gettable_ctx_params(ossl_unused void *vctx,
471                                                   ossl_unused void *provctx)
472{
473    return known_gettable_ctx_params;
474}
475
476static int ecdsa_set_ctx_params(void *vctx, const OSSL_PARAM params[])
477{
478    PROV_ECDSA_CTX *ctx = (PROV_ECDSA_CTX *)vctx;
479    const OSSL_PARAM *p;
480    size_t mdsize = 0;
481
482    if (ctx == NULL)
483        return 0;
484    if (params == NULL)
485        return 1;
486
487#if !defined(OPENSSL_NO_ACVP_TESTS)
488    p = OSSL_PARAM_locate_const(params, OSSL_SIGNATURE_PARAM_KAT);
489    if (p != NULL && !OSSL_PARAM_get_uint(p, &ctx->kattest))
490        return 0;
491#endif
492
493    p = OSSL_PARAM_locate_const(params, OSSL_SIGNATURE_PARAM_DIGEST);
494    if (p != NULL) {
495        char mdname[OSSL_MAX_NAME_SIZE] = "", *pmdname = mdname;
496        char mdprops[OSSL_MAX_PROPQUERY_SIZE] = "", *pmdprops = mdprops;
497        const OSSL_PARAM *propsp =
498            OSSL_PARAM_locate_const(params,
499                                    OSSL_SIGNATURE_PARAM_PROPERTIES);
500
501        if (!OSSL_PARAM_get_utf8_string(p, &pmdname, sizeof(mdname)))
502            return 0;
503        if (propsp != NULL
504            && !OSSL_PARAM_get_utf8_string(propsp, &pmdprops, sizeof(mdprops)))
505            return 0;
506        if (!ecdsa_setup_md(ctx, mdname, mdprops))
507            return 0;
508    }
509
510    p = OSSL_PARAM_locate_const(params, OSSL_SIGNATURE_PARAM_DIGEST_SIZE);
511    if (p != NULL) {
512        if (!OSSL_PARAM_get_size_t(p, &mdsize)
513            || (!ctx->flag_allow_md && mdsize != ctx->mdsize))
514            return 0;
515        ctx->mdsize = mdsize;
516    }
517
518    return 1;
519}
520
521static const OSSL_PARAM settable_ctx_params[] = {
522    OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_DIGEST, NULL, 0),
523    OSSL_PARAM_size_t(OSSL_SIGNATURE_PARAM_DIGEST_SIZE, NULL),
524    OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_PROPERTIES, NULL, 0),
525    OSSL_PARAM_uint(OSSL_SIGNATURE_PARAM_KAT, NULL),
526    OSSL_PARAM_END
527};
528
529static const OSSL_PARAM settable_ctx_params_no_digest[] = {
530    OSSL_PARAM_uint(OSSL_SIGNATURE_PARAM_KAT, NULL),
531    OSSL_PARAM_END
532};
533
534static const OSSL_PARAM *ecdsa_settable_ctx_params(void *vctx,
535                                                   ossl_unused void *provctx)
536{
537    PROV_ECDSA_CTX *ctx = (PROV_ECDSA_CTX *)vctx;
538
539    if (ctx != NULL && !ctx->flag_allow_md)
540        return settable_ctx_params_no_digest;
541    return settable_ctx_params;
542}
543
544static int ecdsa_get_ctx_md_params(void *vctx, OSSL_PARAM *params)
545{
546    PROV_ECDSA_CTX *ctx = (PROV_ECDSA_CTX *)vctx;
547
548    if (ctx->mdctx == NULL)
549        return 0;
550
551    return EVP_MD_CTX_get_params(ctx->mdctx, params);
552}
553
554static const OSSL_PARAM *ecdsa_gettable_ctx_md_params(void *vctx)
555{
556    PROV_ECDSA_CTX *ctx = (PROV_ECDSA_CTX *)vctx;
557
558    if (ctx->md == NULL)
559        return 0;
560
561    return EVP_MD_gettable_ctx_params(ctx->md);
562}
563
564static int ecdsa_set_ctx_md_params(void *vctx, const OSSL_PARAM params[])
565{
566    PROV_ECDSA_CTX *ctx = (PROV_ECDSA_CTX *)vctx;
567
568    if (ctx->mdctx == NULL)
569        return 0;
570
571    return EVP_MD_CTX_set_params(ctx->mdctx, params);
572}
573
574static const OSSL_PARAM *ecdsa_settable_ctx_md_params(void *vctx)
575{
576    PROV_ECDSA_CTX *ctx = (PROV_ECDSA_CTX *)vctx;
577
578    if (ctx->md == NULL)
579        return 0;
580
581    return EVP_MD_settable_ctx_params(ctx->md);
582}
583
584const OSSL_DISPATCH ossl_ecdsa_signature_functions[] = {
585    { OSSL_FUNC_SIGNATURE_NEWCTX, (void (*)(void))ecdsa_newctx },
586    { OSSL_FUNC_SIGNATURE_SIGN_INIT, (void (*)(void))ecdsa_sign_init },
587    { OSSL_FUNC_SIGNATURE_SIGN, (void (*)(void))ecdsa_sign },
588    { OSSL_FUNC_SIGNATURE_VERIFY_INIT, (void (*)(void))ecdsa_verify_init },
589    { OSSL_FUNC_SIGNATURE_VERIFY, (void (*)(void))ecdsa_verify },
590    { OSSL_FUNC_SIGNATURE_DIGEST_SIGN_INIT,
591      (void (*)(void))ecdsa_digest_sign_init },
592    { OSSL_FUNC_SIGNATURE_DIGEST_SIGN_UPDATE,
593      (void (*)(void))ecdsa_digest_signverify_update },
594    { OSSL_FUNC_SIGNATURE_DIGEST_SIGN_FINAL,
595      (void (*)(void))ecdsa_digest_sign_final },
596    { OSSL_FUNC_SIGNATURE_DIGEST_VERIFY_INIT,
597      (void (*)(void))ecdsa_digest_verify_init },
598    { OSSL_FUNC_SIGNATURE_DIGEST_VERIFY_UPDATE,
599      (void (*)(void))ecdsa_digest_signverify_update },
600    { OSSL_FUNC_SIGNATURE_DIGEST_VERIFY_FINAL,
601      (void (*)(void))ecdsa_digest_verify_final },
602    { OSSL_FUNC_SIGNATURE_FREECTX, (void (*)(void))ecdsa_freectx },
603    { OSSL_FUNC_SIGNATURE_DUPCTX, (void (*)(void))ecdsa_dupctx },
604    { OSSL_FUNC_SIGNATURE_GET_CTX_PARAMS, (void (*)(void))ecdsa_get_ctx_params },
605    { OSSL_FUNC_SIGNATURE_GETTABLE_CTX_PARAMS,
606      (void (*)(void))ecdsa_gettable_ctx_params },
607    { OSSL_FUNC_SIGNATURE_SET_CTX_PARAMS, (void (*)(void))ecdsa_set_ctx_params },
608    { OSSL_FUNC_SIGNATURE_SETTABLE_CTX_PARAMS,
609      (void (*)(void))ecdsa_settable_ctx_params },
610    { OSSL_FUNC_SIGNATURE_GET_CTX_MD_PARAMS,
611      (void (*)(void))ecdsa_get_ctx_md_params },
612    { OSSL_FUNC_SIGNATURE_GETTABLE_CTX_MD_PARAMS,
613      (void (*)(void))ecdsa_gettable_ctx_md_params },
614    { OSSL_FUNC_SIGNATURE_SET_CTX_MD_PARAMS,
615      (void (*)(void))ecdsa_set_ctx_md_params },
616    { OSSL_FUNC_SIGNATURE_SETTABLE_CTX_MD_PARAMS,
617      (void (*)(void))ecdsa_settable_ctx_md_params },
618    { 0, NULL }
619};
620