2 * Copyright 2019 The OpenSSL Project Authors. All Rights Reserved.
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
10 #include <openssl/crypto.h>
11 #include <openssl/core_numbers.h>
12 #include <openssl/core_names.h>
13 #include <openssl/dsa.h>
14 #include <openssl/params.h>
15 #include <openssl/evp.h>
16 #include "prov/implementations.h"
17 #include "prov/provider_ctx.h"
19 static OSSL_OP_signature_newctx_fn dsa_newctx;
20 static OSSL_OP_signature_sign_init_fn dsa_signature_init;
21 static OSSL_OP_signature_verify_init_fn dsa_signature_init;
22 static OSSL_OP_signature_sign_fn dsa_sign;
23 static OSSL_OP_signature_verify_fn dsa_verify;
24 static OSSL_OP_signature_digest_sign_init_fn dsa_digest_signverify_init;
25 static OSSL_OP_signature_digest_sign_update_fn dsa_digest_signverify_update;
26 static OSSL_OP_signature_digest_sign_final_fn dsa_digest_sign_final;
27 static OSSL_OP_signature_digest_verify_init_fn dsa_digest_signverify_init;
28 static OSSL_OP_signature_digest_verify_update_fn dsa_digest_signverify_update;
29 static OSSL_OP_signature_digest_verify_final_fn dsa_digest_verify_final;
30 static OSSL_OP_signature_freectx_fn dsa_freectx;
31 static OSSL_OP_signature_dupctx_fn dsa_dupctx;
32 static OSSL_OP_signature_get_ctx_params_fn dsa_get_ctx_params;
33 static OSSL_OP_signature_gettable_ctx_params_fn dsa_gettable_ctx_params;
34 static OSSL_OP_signature_set_ctx_params_fn dsa_set_ctx_params;
35 static OSSL_OP_signature_settable_ctx_params_fn dsa_settable_ctx_params;
36 static OSSL_OP_signature_get_ctx_md_params_fn dsa_get_ctx_md_params;
37 static OSSL_OP_signature_gettable_ctx_md_params_fn dsa_gettable_ctx_md_params;
38 static OSSL_OP_signature_set_ctx_md_params_fn dsa_set_ctx_md_params;
39 static OSSL_OP_signature_settable_ctx_md_params_fn dsa_settable_ctx_md_params;
42 * What's passed as an actual key is defined by the KEYMGMT interface.
43 * We happen to know that our KEYMGMT simply passes DSA structures, so
44 * we use that here too.
51 /* Should be big enough */
57 static void *dsa_newctx(void *provctx)
59 PROV_DSA_CTX *pdsactx = OPENSSL_zalloc(sizeof(PROV_DSA_CTX));
64 pdsactx->libctx = PROV_LIBRARY_CONTEXT_OF(provctx);
68 static int dsa_signature_init(void *vpdsactx, void *vdsa)
70 PROV_DSA_CTX *pdsactx = (PROV_DSA_CTX *)vpdsactx;
72 if (pdsactx == NULL || vdsa == NULL || !DSA_up_ref(vdsa))
74 DSA_free(pdsactx->dsa);
79 static int dsa_sign(void *vpdsactx, unsigned char *sig, size_t *siglen,
80 size_t sigsize, const unsigned char *tbs, size_t tbslen)
82 PROV_DSA_CTX *pdsactx = (PROV_DSA_CTX *)vpdsactx;
85 size_t dsasize = DSA_size(pdsactx->dsa);
92 if (sigsize < (size_t)dsasize)
95 if (pdsactx->mdsize != 0 && tbslen != pdsactx->mdsize)
98 ret = DSA_sign(0, tbs, tbslen, sig, &sltmp, pdsactx->dsa);
107 static int dsa_verify(void *vpdsactx, const unsigned char *sig, size_t siglen,
108 const unsigned char *tbs, size_t tbslen)
110 PROV_DSA_CTX *pdsactx = (PROV_DSA_CTX *)vpdsactx;
112 if (pdsactx->mdsize != 0 && tbslen != pdsactx->mdsize)
115 return DSA_verify(0, tbs, tbslen, sig, siglen, pdsactx->dsa);
118 static int dsa_digest_signverify_init(void *vpdsactx, const char *mdname,
119 const char *props, void *vdsa)
121 PROV_DSA_CTX *pdsactx = (PROV_DSA_CTX *)vpdsactx;
124 if (!dsa_signature_init(vpdsactx, vdsa))
127 md = EVP_MD_fetch(pdsactx->libctx, mdname, props);
131 pdsactx->mdsize = EVP_MD_size(md);
132 pdsactx->mdctx = EVP_MD_CTX_new();
133 if (pdsactx->mdctx == NULL)
136 if (!EVP_DigestInit_ex(pdsactx->mdctx, md, NULL))
142 int dsa_digest_signverify_update(void *vpdsactx, const unsigned char *data,
145 PROV_DSA_CTX *pdsactx = (PROV_DSA_CTX *)vpdsactx;
147 if (pdsactx == NULL || pdsactx->mdctx == NULL)
150 return EVP_DigestUpdate(pdsactx->mdctx, data, datalen);
153 int dsa_digest_sign_final(void *vpdsactx, unsigned char *sig, size_t *siglen,
156 PROV_DSA_CTX *pdsactx = (PROV_DSA_CTX *)vpdsactx;
157 unsigned char digest[EVP_MAX_MD_SIZE];
158 unsigned int dlen = 0;
160 if (pdsactx == NULL || pdsactx->mdctx == NULL)
164 * If sig is NULL then we're just finding out the sig size. Other fields
165 * are ignored. Defer to dsa_sign.
169 * TODO(3.0): There is the possibility that some externally provided
170 * digests exceed EVP_MAX_MD_SIZE. We should probably handle that somehow -
171 * but that problem is much larger than just in DSA.
173 if (!EVP_DigestFinal_ex(pdsactx->mdctx, digest, &dlen))
177 return dsa_sign(vpdsactx, sig, siglen, sigsize, digest, (size_t)dlen);
181 int dsa_digest_verify_final(void *vpdsactx, const unsigned char *sig,
184 PROV_DSA_CTX *pdsactx = (PROV_DSA_CTX *)vpdsactx;
185 unsigned char digest[EVP_MAX_MD_SIZE];
186 unsigned int dlen = 0;
188 if (pdsactx == NULL || pdsactx->mdctx == NULL)
192 * TODO(3.0): There is the possibility that some externally provided
193 * digests exceed EVP_MAX_MD_SIZE. We should probably handle that somehow -
194 * but that problem is much larger than just in DSA.
196 if (!EVP_DigestFinal_ex(pdsactx->mdctx, digest, &dlen))
199 return dsa_verify(vpdsactx, sig, siglen, digest, (size_t)dlen);
202 static void dsa_freectx(void *vpdsactx)
204 PROV_DSA_CTX *pdsactx = (PROV_DSA_CTX *)vpdsactx;
206 DSA_free(pdsactx->dsa);
207 EVP_MD_CTX_free(pdsactx->mdctx);
208 EVP_MD_free(pdsactx->md);
210 OPENSSL_free(pdsactx);
213 static void *dsa_dupctx(void *vpdsactx)
215 PROV_DSA_CTX *srcctx = (PROV_DSA_CTX *)vpdsactx;
216 PROV_DSA_CTX *dstctx;
218 dstctx = OPENSSL_zalloc(sizeof(*srcctx));
225 dstctx->mdctx = NULL;
227 if (srcctx->dsa != NULL && !DSA_up_ref(srcctx->dsa))
229 dstctx->dsa = srcctx->dsa;
231 if (srcctx->md != NULL && !EVP_MD_up_ref(srcctx->md))
233 dstctx->md = srcctx->md;
235 if (srcctx->mdctx != NULL) {
236 dstctx->mdctx = EVP_MD_CTX_new();
237 if (dstctx->mdctx == NULL
238 || !EVP_MD_CTX_copy_ex(dstctx->mdctx, srcctx->mdctx))
248 static int dsa_get_ctx_params(void *vpdsactx, OSSL_PARAM *params)
250 PROV_DSA_CTX *pdsactx = (PROV_DSA_CTX *)vpdsactx;
253 if (pdsactx == NULL || params == NULL)
256 p = OSSL_PARAM_locate(params, OSSL_SIGNATURE_PARAM_DIGEST_SIZE);
257 if (p != NULL && !OSSL_PARAM_set_size_t(p, pdsactx->mdsize))
260 p = OSSL_PARAM_locate(params, OSSL_SIGNATURE_PARAM_DIGEST);
261 if (p != NULL && !OSSL_PARAM_set_utf8_string(p, pdsactx->md == NULL
263 : EVP_MD_name(pdsactx->md)))
269 static const OSSL_PARAM known_gettable_ctx_params[] = {
270 OSSL_PARAM_size_t(OSSL_SIGNATURE_PARAM_DIGEST_SIZE, NULL),
271 OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_DIGEST, NULL, 0),
275 static const OSSL_PARAM *dsa_gettable_ctx_params(void)
277 return known_gettable_ctx_params;
280 static int dsa_set_ctx_params(void *vpdsactx, const OSSL_PARAM params[])
282 PROV_DSA_CTX *pdsactx = (PROV_DSA_CTX *)vpdsactx;
286 if (pdsactx == NULL || params == NULL)
289 if (pdsactx->md != NULL) {
291 * You cannot set the digest name/size when doing a DigestSign or
297 p = OSSL_PARAM_locate_const(params, OSSL_SIGNATURE_PARAM_DIGEST_SIZE);
298 if (p != NULL && !OSSL_PARAM_get_size_t(p, &pdsactx->mdsize))
302 * We never actually use the mdname, but we do support getting it later.
303 * This can be useful for applications that want to know the MD that they
306 p = OSSL_PARAM_locate_const(params, OSSL_SIGNATURE_PARAM_DIGEST);
307 mdname = pdsactx->mdname;
309 && !OSSL_PARAM_get_utf8_string(p, &mdname, sizeof(pdsactx->mdname)))
315 static const OSSL_PARAM known_settable_ctx_params[] = {
316 OSSL_PARAM_size_t(OSSL_SIGNATURE_PARAM_DIGEST_SIZE, NULL),
317 OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_DIGEST, NULL, 0),
321 static const OSSL_PARAM *dsa_settable_ctx_params(void)
324 * TODO(3.0): Should this function return a different set of settable ctx
325 * params if the ctx is being used for a DigestSign/DigestVerify? In that
326 * case it is not allowed to set the digest size/digest name because the
327 * digest is explicitly set as part of the init.
329 return known_settable_ctx_params;
332 static int dsa_get_ctx_md_params(void *vpdsactx, OSSL_PARAM *params)
334 PROV_DSA_CTX *pdsactx = (PROV_DSA_CTX *)vpdsactx;
336 if (pdsactx->mdctx == NULL)
339 return EVP_MD_CTX_get_params(pdsactx->mdctx, params);
342 static const OSSL_PARAM *dsa_gettable_ctx_md_params(void *vpdsactx)
344 PROV_DSA_CTX *pdsactx = (PROV_DSA_CTX *)vpdsactx;
346 if (pdsactx->md == NULL)
349 return EVP_MD_gettable_ctx_params(pdsactx->md);
352 static int dsa_set_ctx_md_params(void *vpdsactx, const OSSL_PARAM params[])
354 PROV_DSA_CTX *pdsactx = (PROV_DSA_CTX *)vpdsactx;
356 if (pdsactx->mdctx == NULL)
359 return EVP_MD_CTX_set_params(pdsactx->mdctx, params);
362 static const OSSL_PARAM *dsa_settable_ctx_md_params(void *vpdsactx)
364 PROV_DSA_CTX *pdsactx = (PROV_DSA_CTX *)vpdsactx;
366 if (pdsactx->md == NULL)
369 return EVP_MD_settable_ctx_params(pdsactx->md);
372 const OSSL_DISPATCH dsa_signature_functions[] = {
373 { OSSL_FUNC_SIGNATURE_NEWCTX, (void (*)(void))dsa_newctx },
374 { OSSL_FUNC_SIGNATURE_SIGN_INIT, (void (*)(void))dsa_signature_init },
375 { OSSL_FUNC_SIGNATURE_SIGN, (void (*)(void))dsa_sign },
376 { OSSL_FUNC_SIGNATURE_VERIFY_INIT, (void (*)(void))dsa_signature_init },
377 { OSSL_FUNC_SIGNATURE_VERIFY, (void (*)(void))dsa_verify },
378 { OSSL_FUNC_SIGNATURE_DIGEST_SIGN_INIT,
379 (void (*)(void))dsa_digest_signverify_init },
380 { OSSL_FUNC_SIGNATURE_DIGEST_SIGN_UPDATE,
381 (void (*)(void))dsa_digest_signverify_update },
382 { OSSL_FUNC_SIGNATURE_DIGEST_SIGN_FINAL,
383 (void (*)(void))dsa_digest_sign_final },
384 { OSSL_FUNC_SIGNATURE_DIGEST_VERIFY_INIT,
385 (void (*)(void))dsa_digest_signverify_init },
386 { OSSL_FUNC_SIGNATURE_DIGEST_VERIFY_UPDATE,
387 (void (*)(void))dsa_digest_signverify_update },
388 { OSSL_FUNC_SIGNATURE_DIGEST_VERIFY_FINAL,
389 (void (*)(void))dsa_digest_verify_final },
390 { OSSL_FUNC_SIGNATURE_FREECTX, (void (*)(void))dsa_freectx },
391 { OSSL_FUNC_SIGNATURE_DUPCTX, (void (*)(void))dsa_dupctx },
392 { OSSL_FUNC_SIGNATURE_GET_CTX_PARAMS, (void (*)(void))dsa_get_ctx_params },
393 { OSSL_FUNC_SIGNATURE_GETTABLE_CTX_PARAMS,
394 (void (*)(void))dsa_gettable_ctx_params },
395 { OSSL_FUNC_SIGNATURE_SET_CTX_PARAMS, (void (*)(void))dsa_set_ctx_params },
396 { OSSL_FUNC_SIGNATURE_SETTABLE_CTX_PARAMS,
397 (void (*)(void))dsa_settable_ctx_params },
398 { OSSL_FUNC_SIGNATURE_GET_CTX_MD_PARAMS,
399 (void (*)(void))dsa_get_ctx_md_params },
400 { OSSL_FUNC_SIGNATURE_GETTABLE_CTX_MD_PARAMS,
401 (void (*)(void))dsa_gettable_ctx_md_params },
402 { OSSL_FUNC_SIGNATURE_SET_CTX_MD_PARAMS,
403 (void (*)(void))dsa_set_ctx_md_params },
404 { OSSL_FUNC_SIGNATURE_SETTABLE_CTX_MD_PARAMS,
405 (void (*)(void))dsa_settable_ctx_md_params },