/src/openssl/crypto/asn1/a_sign.c

Source
/*
 * Copyright 1995-2025 The OpenSSL Project Authors. All Rights Reserved.
 *
 * Licensed under the Apache License 2.0 (the "License").  You may not use
 * this file except in compliance with the License.  You can obtain a copy
 * in the file LICENSE in the source distribution or at
 * https://www.openssl.org/source/license.html
 */

#include <stdio.h>
#include <time.h>
#include <sys/types.h>

#include "internal/cryptlib.h"

#include <openssl/bn.h>
#include <openssl/evp.h>
#include <openssl/x509.h>
#include <openssl/objects.h>
#include <openssl/buffer.h>
#include <openssl/core_names.h>
#include "crypto/asn1.h"
#include "crypto/evp.h"

#ifndef OPENSSL_NO_DEPRECATED_3_0

int ASN1_sign(i2d_of_void *i2d, X509_ALGOR *algor1, X509_ALGOR *algor2,
    ASN1_BIT_STRING *signature, char *data, EVP_PKEY *pkey,
    const EVP_MD *type)
{
    EVP_MD_CTX *ctx = EVP_MD_CTX_new();
    unsigned char *p, *buf_in = NULL, *buf_out = NULL;
    int i, inl = 0, outl = 0;
    size_t inll = 0, outll = 0;
    X509_ALGOR *a;

    if (ctx == NULL) {
        ERR_raise(ERR_LIB_ASN1, ERR_R_EVP_LIB);
        goto err;
    }
    for (i = 0; i < 2; i++) {
        if (i == 0)
            a = algor1;
        else
            a = algor2;
        if (a == NULL)
            continue;
        if (type->pkey_type == NID_dsaWithSHA1) {
            /*
             * special case: RFC 3370 tells us to omit 'parameters' with
             * id-dsa-with-sha1
             */
            ASN1_TYPE_free(a->parameter);
            a->parameter = NULL;
        } else if ((a->parameter == NULL) || (a->parameter->type != V_ASN1_NULL)) {
            ASN1_TYPE_free(a->parameter);
            if ((a->parameter = ASN1_TYPE_new()) == NULL)
                goto err;
            a->parameter->type = V_ASN1_NULL;
        }
        ASN1_OBJECT_free(a->algorithm);
        a->algorithm = OBJ_nid2obj(type->pkey_type);
        if (a->algorithm == NULL) {
            ERR_raise(ERR_LIB_ASN1, ASN1_R_UNKNOWN_OBJECT_TYPE);
            goto err;
        }
        if (a->algorithm->length == 0) {
            ERR_raise(ERR_LIB_ASN1,
                ASN1_R_THE_ASN1_OBJECT_IDENTIFIER_IS_NOT_KNOWN_FOR_THIS_MD);
            goto err;
        }
    }
    inl = i2d(data, NULL);
    if (inl <= 0) {
        ERR_raise(ERR_LIB_ASN1, ERR_R_INTERNAL_ERROR);
        goto err;
    }
    inll = (size_t)inl;
    buf_in = OPENSSL_malloc(inll);
    outll = outl = EVP_PKEY_get_size(pkey);
    buf_out = OPENSSL_malloc(outll);
    if (buf_in == NULL || buf_out == NULL) {
        outl = 0;
        goto err;
    }
    p = buf_in;

    i2d(data, &p);
    if (!EVP_SignInit_ex(ctx, type, NULL)
        || !EVP_SignUpdate(ctx, (unsigned char *)buf_in, inl)
        || !EVP_SignFinal(ctx, (unsigned char *)buf_out,
            (unsigned int *)&outl, pkey)) {
        outl = 0;
        ERR_raise(ERR_LIB_ASN1, ERR_R_EVP_LIB);
        goto err;
    }
    ASN1_STRING_set0(signature, buf_out, outl);
    buf_out = NULL;
    /*
     * In the interests of compatibility, I'll make sure that the bit string
     * has a 'not-used bits' value of 0
     */
    ossl_asn1_string_set_bits_left(signature, 0);
err:
    EVP_MD_CTX_free(ctx);
    OPENSSL_clear_free((char *)buf_in, inll);
    OPENSSL_clear_free((char *)buf_out, outll);
    return outl;
}

#endif

int ASN1_item_sign(const ASN1_ITEM *it, X509_ALGOR *algor1, X509_ALGOR *algor2,
    ASN1_BIT_STRING *signature, const void *data,
    EVP_PKEY *pkey, const EVP_MD *md)
{
    return ASN1_item_sign_ex(it, algor1, algor2, signature, data, NULL, pkey,
        md, NULL, NULL);
}

int ASN1_item_sign_ex(const ASN1_ITEM *it, X509_ALGOR *algor1,
    X509_ALGOR *algor2, ASN1_BIT_STRING *signature,
    const void *data, const ASN1_OCTET_STRING *id,
    EVP_PKEY *pkey, const EVP_MD *md, OSSL_LIB_CTX *libctx,
    const char *propq)
{
    int rv = 0;
    EVP_MD_CTX *ctx = evp_md_ctx_new_ex(pkey, id, libctx, propq);

    if (ctx == NULL) {
        ERR_raise(ERR_LIB_ASN1, ERR_R_EVP_LIB);
        return 0;
    }
    /* We can use the non _ex variant here since the pkey is already setup */
    if (!EVP_DigestSignInit(ctx, NULL, md, NULL, pkey))
        goto err;

    rv = ASN1_item_sign_ctx(it, algor1, algor2, signature, data, ctx);

err:
    EVP_PKEY_CTX_free(EVP_MD_CTX_get_pkey_ctx(ctx));
    EVP_MD_CTX_free(ctx);
    return rv;
}

static int replace_algor_contents_from_DER(X509_ALGOR *algor, const unsigned char *aid, size_t len)
{
    /* as a workaround for d2i_*() freeing its first argument, using NULL instead: */
    X509_ALGOR *alg = d2i_X509_ALGOR(NULL, &aid, (long)len);
    int ret;

    if (alg == NULL) {
        ERR_raise(ERR_LIB_ASN1, ASN1_R_DECODE_ERROR);
        return 0;
    }
    ret = X509_ALGOR_copy(algor, alg);
    X509_ALGOR_free(alg);
    return ret;
}

int ASN1_item_sign_ctx(const ASN1_ITEM *it, X509_ALGOR *algor1,
    X509_ALGOR *algor2, ASN1_BIT_STRING *signature,
    const void *data, EVP_MD_CTX *ctx)
{
    const EVP_MD *md;
    EVP_PKEY *pkey;
    unsigned char *buf_in = NULL, *buf_out = NULL;
    size_t inl = 0, outl = 0, outll = 0;
    int signid, paramtype, buf_len = 0;
    int rv, pkey_id;

    md = EVP_MD_CTX_get0_md(ctx);
    pkey = EVP_PKEY_CTX_get0_pkey(EVP_MD_CTX_get_pkey_ctx(ctx));

    if (pkey == NULL) {
        ERR_raise(ERR_LIB_ASN1, ASN1_R_CONTEXT_NOT_INITIALISED);
        goto err;
    }

    if (pkey->ameth == NULL) {
        EVP_PKEY_CTX *pctx = EVP_MD_CTX_get_pkey_ctx(ctx);
        OSSL_PARAM params[2];
        unsigned char aid[128];
        size_t aid_len = 0;

        if (pctx == NULL
            || !EVP_PKEY_CTX_IS_SIGNATURE_OP(pctx)) {
            ERR_raise(ERR_LIB_ASN1, ASN1_R_CONTEXT_NOT_INITIALISED);
            goto err;
        }

        params[0] = OSSL_PARAM_construct_octet_string(OSSL_SIGNATURE_PARAM_ALGORITHM_ID,
            aid, sizeof(aid));
        params[1] = OSSL_PARAM_construct_end();

        if (EVP_PKEY_CTX_get_params(pctx, params) <= 0)
            goto err;

        if ((aid_len = params[0].return_size) == 0) {
            ERR_raise(ERR_LIB_ASN1, ASN1_R_DIGEST_AND_KEY_TYPE_NOT_SUPPORTED);
            goto err;
        }

        if (algor1 != NULL && !replace_algor_contents_from_DER(algor1, aid, aid_len))
            goto err;
        if (algor2 != NULL && !replace_algor_contents_from_DER(algor2, aid, aid_len))
            goto err;

        rv = 3;
    } else if (pkey->ameth->item_sign) {
        rv = pkey->ameth->item_sign(ctx, it, data, algor1, algor2, signature);
        if (rv == 1)
            outl = signature->length;
        /*-
         * Return value meanings:
         * <=0: error.
         *   1: method does everything.
         *   2: carry on as normal.
         *   3: ASN1 method sets algorithm identifiers: just sign.
         */
        if (rv <= 0)
            ERR_raise(ERR_LIB_ASN1, ERR_R_EVP_LIB);
        if (rv <= 1)
            goto err;
    } else {
        rv = 2;
    }

    if (rv == 2) {
        if (md == NULL) {
            ERR_raise(ERR_LIB_ASN1, ASN1_R_CONTEXT_NOT_INITIALISED);
            goto err;
        }

        pkey_id =
#ifndef OPENSSL_NO_SM2
            EVP_PKEY_get_id(pkey) == NID_sm2 ? NID_sm2 :
#endif
                                             pkey->ameth->pkey_id;

        if (!OBJ_find_sigid_by_algs(&signid, EVP_MD_nid(md), pkey_id)) {
            ERR_raise(ERR_LIB_ASN1, ASN1_R_DIGEST_AND_KEY_TYPE_NOT_SUPPORTED);
            goto err;
        }

        paramtype = pkey->ameth->pkey_flags & ASN1_PKEY_SIGPARAM_NULL ? V_ASN1_NULL : V_ASN1_UNDEF;
        if (algor1 != NULL
            && !X509_ALGOR_set0(algor1, OBJ_nid2obj(signid), paramtype, NULL))
            goto err;
        if (algor2 != NULL
            && !X509_ALGOR_set0(algor2, OBJ_nid2obj(signid), paramtype, NULL))
            goto err;
    }

    buf_len = ASN1_item_i2d(data, &buf_in, it);
    if (buf_len <= 0) {
        outl = 0;
        ERR_raise(ERR_LIB_ASN1, ERR_R_INTERNAL_ERROR);
        goto err;
    }
    inl = buf_len;
    if (!EVP_DigestSign(ctx, NULL, &outll, buf_in, inl)) {
        outl = 0;
        ERR_raise(ERR_LIB_ASN1, ERR_R_EVP_LIB);
        goto err;
    }
    outl = outll;
    buf_out = OPENSSL_malloc(outll);
    if (buf_in == NULL || buf_out == NULL) {
        outl = 0;
        goto err;
    }

    if (!EVP_DigestSign(ctx, buf_out, &outl, buf_in, inl)) {
        outl = 0;
        ERR_raise(ERR_LIB_ASN1, ERR_R_EVP_LIB);
        goto err;
    }
    ASN1_STRING_set0(signature, buf_out, (int)outl);
    buf_out = NULL;
    /*
     * In the interests of compatibility, I'll make sure that the bit string
     * has a 'not-used bits' value of 0
     */
    ossl_asn1_string_set_bits_left(signature, 0);
err:
    OPENSSL_clear_free((char *)buf_in, inl);
    OPENSSL_clear_free((char *)buf_out, outll);
    return (int)outl;
}

Coverage Report

Created: 2026-02-22 06:11

Line	Count	Source
1		/*
2		* Copyright 1995-2025 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		#include <stdio.h>
11		#include <time.h>
12		#include <sys/types.h>
13
14		#include "internal/cryptlib.h"
15
16		#include <openssl/bn.h>
17		#include <openssl/evp.h>
18		#include <openssl/x509.h>
19		#include <openssl/objects.h>
20		#include <openssl/buffer.h>
21		#include <openssl/core_names.h>
22		#include "crypto/asn1.h"
23		#include "crypto/evp.h"
24
25		#ifndef OPENSSL_NO_DEPRECATED_3_0
26
27		int ASN1_sign(i2d_of_void i2d, X509_ALGOR algor1, X509_ALGOR *algor2,
28		ASN1_BIT_STRING signature, char data, EVP_PKEY *pkey,
29		const EVP_MD *type)
30	0	{
31	0	EVP_MD_CTX *ctx = EVP_MD_CTX_new();
32	0	unsigned char p, buf_in = NULL, *buf_out = NULL;
33	0	int i, inl = 0, outl = 0;
34	0	size_t inll = 0, outll = 0;
35	0	X509_ALGOR *a;
36
37	0	if (ctx == NULL) {
38	0	ERR_raise(ERR_LIB_ASN1, ERR_R_EVP_LIB);
39	0	goto err;
40	0	}
41	0	for (i = 0; i < 2; i++) {
42	0	if (i == 0)
43	0	a = algor1;
44	0	else
45	0	a = algor2;
46	0	if (a == NULL)
47	0	continue;
48	0	if (type->pkey_type == NID_dsaWithSHA1) {
49		/*
50		* special case: RFC 3370 tells us to omit 'parameters' with
51		* id-dsa-with-sha1
52		*/
53	0	ASN1_TYPE_free(a->parameter);
54	0	a->parameter = NULL;
55	0	} else if ((a->parameter == NULL) \|\| (a->parameter->type != V_ASN1_NULL)) {
56	0	ASN1_TYPE_free(a->parameter);
57	0	if ((a->parameter = ASN1_TYPE_new()) == NULL)
58	0	goto err;
59	0	a->parameter->type = V_ASN1_NULL;
60	0	}
61	0	ASN1_OBJECT_free(a->algorithm);
62	0	a->algorithm = OBJ_nid2obj(type->pkey_type);
63	0	if (a->algorithm == NULL) {
64	0	ERR_raise(ERR_LIB_ASN1, ASN1_R_UNKNOWN_OBJECT_TYPE);
65	0	goto err;
66	0	}
67	0	if (a->algorithm->length == 0) {
68	0	ERR_raise(ERR_LIB_ASN1,
69	0	ASN1_R_THE_ASN1_OBJECT_IDENTIFIER_IS_NOT_KNOWN_FOR_THIS_MD);
70	0	goto err;
71	0	}
72	0	}
73	0	inl = i2d(data, NULL);
74	0	if (inl <= 0) {
75	0	ERR_raise(ERR_LIB_ASN1, ERR_R_INTERNAL_ERROR);
76	0	goto err;
77	0	}
78	0	inll = (size_t)inl;
79	0	buf_in = OPENSSL_malloc(inll);
80	0	outll = outl = EVP_PKEY_get_size(pkey);
81	0	buf_out = OPENSSL_malloc(outll);
82	0	if (buf_in == NULL \|\| buf_out == NULL) {
83	0	outl = 0;
84	0	goto err;
85	0	}
86	0	p = buf_in;
87
88	0	i2d(data, &p);
89	0	if (!EVP_SignInit_ex(ctx, type, NULL)
90	0	\|\| !EVP_SignUpdate(ctx, (unsigned char *)buf_in, inl)
91	0	\|\| !EVP_SignFinal(ctx, (unsigned char *)buf_out,
92	0	(unsigned int *)&outl, pkey)) {
93	0	outl = 0;
94	0	ERR_raise(ERR_LIB_ASN1, ERR_R_EVP_LIB);
95	0	goto err;
96	0	}
97	0	ASN1_STRING_set0(signature, buf_out, outl);
98	0	buf_out = NULL;
99		/*
100		* In the interests of compatibility, I'll make sure that the bit string
101		* has a 'not-used bits' value of 0
102		*/
103	0	ossl_asn1_string_set_bits_left(signature, 0);
104	0	err:
105	0	EVP_MD_CTX_free(ctx);
106	0	OPENSSL_clear_free((char *)buf_in, inll);
107	0	OPENSSL_clear_free((char *)buf_out, outll);
108	0	return outl;
109	0	}
110
111		#endif
112
113		int ASN1_item_sign(const ASN1_ITEM it, X509_ALGOR algor1, X509_ALGOR *algor2,
114		ASN1_BIT_STRING signature, const void data,
115		EVP_PKEY pkey, const EVP_MD md)
116	0	{
117	0	return ASN1_item_sign_ex(it, algor1, algor2, signature, data, NULL, pkey,
118	0	md, NULL, NULL);
119	0	}
120
121		int ASN1_item_sign_ex(const ASN1_ITEM it, X509_ALGOR algor1,
122		X509_ALGOR algor2, ASN1_BIT_STRING signature,
123		const void data, const ASN1_OCTET_STRING id,
124		EVP_PKEY pkey, const EVP_MD md, OSSL_LIB_CTX *libctx,
125		const char *propq)
126	0	{
127	0	int rv = 0;
128	0	EVP_MD_CTX *ctx = evp_md_ctx_new_ex(pkey, id, libctx, propq);
129
130	0	if (ctx == NULL) {
131	0	ERR_raise(ERR_LIB_ASN1, ERR_R_EVP_LIB);
132	0	return 0;
133	0	}
134		/* We can use the non _ex variant here since the pkey is already setup */
135	0	if (!EVP_DigestSignInit(ctx, NULL, md, NULL, pkey))
136	0	goto err;
137
138	0	rv = ASN1_item_sign_ctx(it, algor1, algor2, signature, data, ctx);
139
140	0	err:
141	0	EVP_PKEY_CTX_free(EVP_MD_CTX_get_pkey_ctx(ctx));
142	0	EVP_MD_CTX_free(ctx);
143	0	return rv;
144	0	}
145
146		static int replace_algor_contents_from_DER(X509_ALGOR algor, const unsigned char aid, size_t len)
147	0	{
148		/* as a workaround for d2i_() freeing its first argument, using NULL instead: /
149	0	X509_ALGOR *alg = d2i_X509_ALGOR(NULL, &aid, (long)len);
150	0	int ret;
151
152	0	if (alg == NULL) {
153	0	ERR_raise(ERR_LIB_ASN1, ASN1_R_DECODE_ERROR);
154	0	return 0;
155	0	}
156	0	ret = X509_ALGOR_copy(algor, alg);
157	0	X509_ALGOR_free(alg);
158	0	return ret;
159	0	}
160
161		int ASN1_item_sign_ctx(const ASN1_ITEM it, X509_ALGOR algor1,
162		X509_ALGOR algor2, ASN1_BIT_STRING signature,
163		const void data, EVP_MD_CTX ctx)
164	0	{
165	0	const EVP_MD *md;
166	0	EVP_PKEY *pkey;
167	0	unsigned char buf_in = NULL, buf_out = NULL;
168	0	size_t inl = 0, outl = 0, outll = 0;
169	0	int signid, paramtype, buf_len = 0;
170	0	int rv, pkey_id;
171
172	0	md = EVP_MD_CTX_get0_md(ctx);
173	0	pkey = EVP_PKEY_CTX_get0_pkey(EVP_MD_CTX_get_pkey_ctx(ctx));
174
175	0	if (pkey == NULL) {
176	0	ERR_raise(ERR_LIB_ASN1, ASN1_R_CONTEXT_NOT_INITIALISED);
177	0	goto err;
178	0	}
179
180	0	if (pkey->ameth == NULL) {
181	0	EVP_PKEY_CTX *pctx = EVP_MD_CTX_get_pkey_ctx(ctx);
182	0	OSSL_PARAM params[2];
183	0	unsigned char aid[128];
184	0	size_t aid_len = 0;
185
186	0	if (pctx == NULL
187	0	\|\| !EVP_PKEY_CTX_IS_SIGNATURE_OP(pctx)) {
188	0	ERR_raise(ERR_LIB_ASN1, ASN1_R_CONTEXT_NOT_INITIALISED);
189	0	goto err;
190	0	}
191
192	0	params[0] = OSSL_PARAM_construct_octet_string(OSSL_SIGNATURE_PARAM_ALGORITHM_ID,
193	0	aid, sizeof(aid));
194	0	params[1] = OSSL_PARAM_construct_end();
195
196	0	if (EVP_PKEY_CTX_get_params(pctx, params) <= 0)
197	0	goto err;
198
199	0	if ((aid_len = params[0].return_size) == 0) {
200	0	ERR_raise(ERR_LIB_ASN1, ASN1_R_DIGEST_AND_KEY_TYPE_NOT_SUPPORTED);
201	0	goto err;
202	0	}
203
204	0	if (algor1 != NULL && !replace_algor_contents_from_DER(algor1, aid, aid_len))
205	0	goto err;
206	0	if (algor2 != NULL && !replace_algor_contents_from_DER(algor2, aid, aid_len))
207	0	goto err;
208
209	0	rv = 3;
210	0	} else if (pkey->ameth->item_sign) {
211	0	rv = pkey->ameth->item_sign(ctx, it, data, algor1, algor2, signature);
212	0	if (rv == 1)
213	0	outl = signature->length;
214		/*-
215		* Return value meanings:
216		* <=0: error.
217		* 1: method does everything.
218		* 2: carry on as normal.
219		* 3: ASN1 method sets algorithm identifiers: just sign.
220		*/
221	0	if (rv <= 0)
222	0	ERR_raise(ERR_LIB_ASN1, ERR_R_EVP_LIB);
223	0	if (rv <= 1)
224	0	goto err;
225	0	} else {
226	0	rv = 2;
227	0	}
228
229	0	if (rv == 2) {
230	0	if (md == NULL) {
231	0	ERR_raise(ERR_LIB_ASN1, ASN1_R_CONTEXT_NOT_INITIALISED);
232	0	goto err;
233	0	}
234
235	0	pkey_id =
236	0	#ifndef OPENSSL_NO_SM2
237	0	EVP_PKEY_get_id(pkey) == NID_sm2 ? NID_sm2 :
238	0	#endif
239	0	pkey->ameth->pkey_id;
240
241	0	if (!OBJ_find_sigid_by_algs(&signid, EVP_MD_nid(md), pkey_id)) {
242	0	ERR_raise(ERR_LIB_ASN1, ASN1_R_DIGEST_AND_KEY_TYPE_NOT_SUPPORTED);
243	0	goto err;
244	0	}
245
246	0	paramtype = pkey->ameth->pkey_flags & ASN1_PKEY_SIGPARAM_NULL ? V_ASN1_NULL : V_ASN1_UNDEF;
247	0	if (algor1 != NULL
248	0	&& !X509_ALGOR_set0(algor1, OBJ_nid2obj(signid), paramtype, NULL))
249	0	goto err;
250	0	if (algor2 != NULL
251	0	&& !X509_ALGOR_set0(algor2, OBJ_nid2obj(signid), paramtype, NULL))
252	0	goto err;
253	0	}
254
255	0	buf_len = ASN1_item_i2d(data, &buf_in, it);
256	0	if (buf_len <= 0) {
257	0	outl = 0;
258	0	ERR_raise(ERR_LIB_ASN1, ERR_R_INTERNAL_ERROR);
259	0	goto err;
260	0	}
261	0	inl = buf_len;
262	0	if (!EVP_DigestSign(ctx, NULL, &outll, buf_in, inl)) {
263	0	outl = 0;
264	0	ERR_raise(ERR_LIB_ASN1, ERR_R_EVP_LIB);
265	0	goto err;
266	0	}
267	0	outl = outll;
268	0	buf_out = OPENSSL_malloc(outll);
269	0	if (buf_in == NULL \|\| buf_out == NULL) {
270	0	outl = 0;
271	0	goto err;
272	0	}
273
274	0	if (!EVP_DigestSign(ctx, buf_out, &outl, buf_in, inl)) {
275	0	outl = 0;
276	0	ERR_raise(ERR_LIB_ASN1, ERR_R_EVP_LIB);
277	0	goto err;
278	0	}
279	0	ASN1_STRING_set0(signature, buf_out, (int)outl);
280	0	buf_out = NULL;
281		/*
282		* In the interests of compatibility, I'll make sure that the bit string
283		* has a 'not-used bits' value of 0
284		*/
285	0	ossl_asn1_string_set_bits_left(signature, 0);
286	0	err:
287	0	OPENSSL_clear_free((char *)buf_in, inl);
288	0	OPENSSL_clear_free((char *)buf_out, outll);
289	0	return (int)outl;
290	0	}