/src/openssl30/crypto/cms/cms_rsa.c

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/*
 * Copyright 2006-2023 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 <assert.h>
#include <openssl/cms.h>
#include <openssl/err.h>
#include <openssl/core_names.h>
#include "crypto/asn1.h"
#include "crypto/rsa.h"
#include "crypto/evp.h"
#include "cms_local.h"

static RSA_OAEP_PARAMS *rsa_oaep_decode(const X509_ALGOR *alg)
{
    RSA_OAEP_PARAMS *oaep;

    oaep = ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(RSA_OAEP_PARAMS),
                                     alg->parameter);

    if (oaep == NULL)
        return NULL;

    if (oaep->maskGenFunc != NULL) {
        oaep->maskHash = ossl_x509_algor_mgf1_decode(oaep->maskGenFunc);
        if (oaep->maskHash == NULL) {
            RSA_OAEP_PARAMS_free(oaep);
            return NULL;
        }
    }
    return oaep;
}

static int rsa_cms_decrypt(CMS_RecipientInfo *ri)
{
    EVP_PKEY_CTX *pkctx;
    X509_ALGOR *cmsalg;
    int nid;
    int rv = -1;
    unsigned char *label = NULL;
    int labellen = 0;
    const EVP_MD *mgf1md = NULL, *md = NULL;
    RSA_OAEP_PARAMS *oaep;

    pkctx = CMS_RecipientInfo_get0_pkey_ctx(ri);
    if (pkctx == NULL)
        return 0;
    if (!CMS_RecipientInfo_ktri_get0_algs(ri, NULL, NULL, &cmsalg))
        return -1;
    nid = OBJ_obj2nid(cmsalg->algorithm);
    if (nid == NID_rsaEncryption)
        return 1;
    if (nid != NID_rsaesOaep) {
        ERR_raise(ERR_LIB_CMS, CMS_R_UNSUPPORTED_ENCRYPTION_TYPE);
        return -1;
    }
    /* Decode OAEP parameters */
    oaep = rsa_oaep_decode(cmsalg);

    if (oaep == NULL) {
        ERR_raise(ERR_LIB_CMS, CMS_R_INVALID_OAEP_PARAMETERS);
        goto err;
    }

    mgf1md = ossl_x509_algor_get_md(oaep->maskHash);
    if (mgf1md == NULL)
        goto err;
    md = ossl_x509_algor_get_md(oaep->hashFunc);
    if (md == NULL)
        goto err;

    if (oaep->pSourceFunc != NULL) {
        X509_ALGOR *plab = oaep->pSourceFunc;

        if (OBJ_obj2nid(plab->algorithm) != NID_pSpecified) {
            ERR_raise(ERR_LIB_CMS, CMS_R_UNSUPPORTED_LABEL_SOURCE);
            goto err;
        }
        if (plab->parameter->type != V_ASN1_OCTET_STRING) {
            ERR_raise(ERR_LIB_CMS, CMS_R_INVALID_LABEL);
            goto err;
        }

        label = plab->parameter->value.octet_string->data;
        /* Stop label being freed when OAEP parameters are freed */
        plab->parameter->value.octet_string->data = NULL;
        labellen = plab->parameter->value.octet_string->length;
    }

    if (EVP_PKEY_CTX_set_rsa_padding(pkctx, RSA_PKCS1_OAEP_PADDING) <= 0)
        goto err;
    if (EVP_PKEY_CTX_set_rsa_oaep_md(pkctx, md) <= 0)
        goto err;
    if (EVP_PKEY_CTX_set_rsa_mgf1_md(pkctx, mgf1md) <= 0)
        goto err;
    if (label != NULL
            && EVP_PKEY_CTX_set0_rsa_oaep_label(pkctx, label, labellen) <= 0)
        goto err;
    /* Carry on */
    rv = 1;

 err:
    RSA_OAEP_PARAMS_free(oaep);
    return rv;
}

static int rsa_cms_encrypt(CMS_RecipientInfo *ri)
{
    const EVP_MD *md, *mgf1md;
    RSA_OAEP_PARAMS *oaep = NULL;
    ASN1_STRING *os = NULL;
    X509_ALGOR *alg;
    EVP_PKEY_CTX *pkctx = CMS_RecipientInfo_get0_pkey_ctx(ri);
    int pad_mode = RSA_PKCS1_PADDING, rv = 0, labellen;
    unsigned char *label;

    if (CMS_RecipientInfo_ktri_get0_algs(ri, NULL, NULL, &alg) <= 0)
        return 0;
    if (pkctx != NULL) {
        if (EVP_PKEY_CTX_get_rsa_padding(pkctx, &pad_mode) <= 0)
            return 0;
    }
    if (pad_mode == RSA_PKCS1_PADDING) {
        X509_ALGOR_set0(alg, OBJ_nid2obj(NID_rsaEncryption), V_ASN1_NULL, 0);
        return 1;
    }
    /* Not supported */
    if (pad_mode != RSA_PKCS1_OAEP_PADDING)
        return 0;
    if (EVP_PKEY_CTX_get_rsa_oaep_md(pkctx, &md) <= 0)
        goto err;
    if (EVP_PKEY_CTX_get_rsa_mgf1_md(pkctx, &mgf1md) <= 0)
        goto err;
    labellen = EVP_PKEY_CTX_get0_rsa_oaep_label(pkctx, &label);
    if (labellen < 0)
        goto err;
    oaep = RSA_OAEP_PARAMS_new();
    if (oaep == NULL)
        goto err;
    if (!ossl_x509_algor_new_from_md(&oaep->hashFunc, md))
        goto err;
    if (!ossl_x509_algor_md_to_mgf1(&oaep->maskGenFunc, mgf1md))
        goto err;
    if (labellen > 0) {
        ASN1_OCTET_STRING *los;

        oaep->pSourceFunc = X509_ALGOR_new();
        if (oaep->pSourceFunc == NULL)
            goto err;
        los = ASN1_OCTET_STRING_new();
        if (los == NULL)
            goto err;
        if (!ASN1_OCTET_STRING_set(los, label, labellen)) {
            ASN1_OCTET_STRING_free(los);
            goto err;
        }
        X509_ALGOR_set0(oaep->pSourceFunc, OBJ_nid2obj(NID_pSpecified),
                        V_ASN1_OCTET_STRING, los);
    }
    /* create string with pss parameter encoding. */
    if (!ASN1_item_pack(oaep, ASN1_ITEM_rptr(RSA_OAEP_PARAMS), &os))
         goto err;
    X509_ALGOR_set0(alg, OBJ_nid2obj(NID_rsaesOaep), V_ASN1_SEQUENCE, os);
    os = NULL;
    rv = 1;
 err:
    RSA_OAEP_PARAMS_free(oaep);
    ASN1_STRING_free(os);
    return rv;
}

int ossl_cms_rsa_envelope(CMS_RecipientInfo *ri, int decrypt)
{
    assert(decrypt == 0 || decrypt == 1);

    if (decrypt == 1)
        return rsa_cms_decrypt(ri);

    if (decrypt == 0)
        return rsa_cms_encrypt(ri);

    ERR_raise(ERR_LIB_CMS, CMS_R_NOT_SUPPORTED_FOR_THIS_KEY_TYPE);
    return 0;
}

static int rsa_cms_sign(CMS_SignerInfo *si)
{
    int pad_mode = RSA_PKCS1_PADDING;
    X509_ALGOR *alg;
    EVP_PKEY_CTX *pkctx = CMS_SignerInfo_get0_pkey_ctx(si);
    unsigned char aid[128];
    const unsigned char *pp = aid;
    size_t aid_len = 0;
    OSSL_PARAM params[2];

    CMS_SignerInfo_get0_algs(si, NULL, NULL, NULL, &alg);
    if (pkctx != NULL) {
        if (EVP_PKEY_CTX_get_rsa_padding(pkctx, &pad_mode) <= 0)
            return 0;
    }
    if (pad_mode == RSA_PKCS1_PADDING) {
        X509_ALGOR_set0(alg, OBJ_nid2obj(NID_rsaEncryption), V_ASN1_NULL, 0);
        return 1;
    }
    /* We don't support it */
    if (pad_mode != RSA_PKCS1_PSS_PADDING)
        return 0;

    if (evp_pkey_ctx_is_legacy(pkctx)) {
        /* No provider -> we cannot query it for algorithm ID. */
        ASN1_STRING *os = NULL;

        os = ossl_rsa_ctx_to_pss_string(pkctx);
        if (os == NULL)
            return 0;
        return X509_ALGOR_set0(alg, OBJ_nid2obj(EVP_PKEY_RSA_PSS), V_ASN1_SEQUENCE, os);
    }

    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(pkctx, params) <= 0)
        return 0;
    if ((aid_len = params[0].return_size) == 0)
        return 0;
    if (d2i_X509_ALGOR(&alg, &pp, aid_len) == NULL)
        return 0;
    return 1;
}

static int rsa_cms_verify(CMS_SignerInfo *si)
{
    int nid, nid2;
    X509_ALGOR *alg;
    EVP_PKEY_CTX *pkctx = CMS_SignerInfo_get0_pkey_ctx(si);
    EVP_PKEY *pkey = EVP_PKEY_CTX_get0_pkey(pkctx);

    CMS_SignerInfo_get0_algs(si, NULL, NULL, NULL, &alg);
    nid = OBJ_obj2nid(alg->algorithm);
    if (nid == EVP_PKEY_RSA_PSS)
        return ossl_rsa_pss_to_ctx(NULL, pkctx, alg, NULL) > 0;
    /* Only PSS allowed for PSS keys */
    if (EVP_PKEY_is_a(pkey, "RSA-PSS")) {
        ERR_raise(ERR_LIB_RSA, RSA_R_ILLEGAL_OR_UNSUPPORTED_PADDING_MODE);
        return 0;
    }
    if (nid == NID_rsaEncryption)
        return 1;
    /* Workaround for some implementation that use a signature OID */
    if (OBJ_find_sigid_algs(nid, NULL, &nid2)) {
        if (nid2 == NID_rsaEncryption)
            return 1;
    }
    return 0;
}

int ossl_cms_rsa_sign(CMS_SignerInfo *si, int verify)
{
    assert(verify == 0 || verify == 1);

    if (verify == 1)
        return rsa_cms_verify(si);

    if (verify == 0)
        return rsa_cms_sign(si);

    ERR_raise(ERR_LIB_CMS, CMS_R_NOT_SUPPORTED_FOR_THIS_KEY_TYPE);
    return 0;
}

Coverage Report

Created: 2023-09-25 06:41

Line	Count	Source (jump to first uncovered line)
1		/*
2		* Copyright 2006-2023 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 <assert.h>
11		#include <openssl/cms.h>
12		#include <openssl/err.h>
13		#include <openssl/core_names.h>
14		#include "crypto/asn1.h"
15		#include "crypto/rsa.h"
16		#include "crypto/evp.h"
17		#include "cms_local.h"
18
19		static RSA_OAEP_PARAMS rsa_oaep_decode(const X509_ALGOR alg)
20	0	{
21	0	RSA_OAEP_PARAMS *oaep;
22
23	0	oaep = ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(RSA_OAEP_PARAMS),
24	0	alg->parameter);
25
26	0	if (oaep == NULL)
27	0	return NULL;
28
29	0	if (oaep->maskGenFunc != NULL) {
30	0	oaep->maskHash = ossl_x509_algor_mgf1_decode(oaep->maskGenFunc);
31	0	if (oaep->maskHash == NULL) {
32	0	RSA_OAEP_PARAMS_free(oaep);
33	0	return NULL;
34	0	}
35	0	}
36	0	return oaep;
37	0	}
38
39		static int rsa_cms_decrypt(CMS_RecipientInfo *ri)
40	0	{
41	0	EVP_PKEY_CTX *pkctx;
42	0	X509_ALGOR *cmsalg;
43	0	int nid;
44	0	int rv = -1;
45	0	unsigned char *label = NULL;
46	0	int labellen = 0;
47	0	const EVP_MD mgf1md = NULL, md = NULL;
48	0	RSA_OAEP_PARAMS *oaep;
49
50	0	pkctx = CMS_RecipientInfo_get0_pkey_ctx(ri);
51	0	if (pkctx == NULL)
52	0	return 0;
53	0	if (!CMS_RecipientInfo_ktri_get0_algs(ri, NULL, NULL, &cmsalg))
54	0	return -1;
55	0	nid = OBJ_obj2nid(cmsalg->algorithm);
56	0	if (nid == NID_rsaEncryption)
57	0	return 1;
58	0	if (nid != NID_rsaesOaep) {
59	0	ERR_raise(ERR_LIB_CMS, CMS_R_UNSUPPORTED_ENCRYPTION_TYPE);
60	0	return -1;
61	0	}
62		/* Decode OAEP parameters */
63	0	oaep = rsa_oaep_decode(cmsalg);
64
65	0	if (oaep == NULL) {
66	0	ERR_raise(ERR_LIB_CMS, CMS_R_INVALID_OAEP_PARAMETERS);
67	0	goto err;
68	0	}
69
70	0	mgf1md = ossl_x509_algor_get_md(oaep->maskHash);
71	0	if (mgf1md == NULL)
72	0	goto err;
73	0	md = ossl_x509_algor_get_md(oaep->hashFunc);
74	0	if (md == NULL)
75	0	goto err;
76
77	0	if (oaep->pSourceFunc != NULL) {
78	0	X509_ALGOR *plab = oaep->pSourceFunc;
79
80	0	if (OBJ_obj2nid(plab->algorithm) != NID_pSpecified) {
81	0	ERR_raise(ERR_LIB_CMS, CMS_R_UNSUPPORTED_LABEL_SOURCE);
82	0	goto err;
83	0	}
84	0	if (plab->parameter->type != V_ASN1_OCTET_STRING) {
85	0	ERR_raise(ERR_LIB_CMS, CMS_R_INVALID_LABEL);
86	0	goto err;
87	0	}
88
89	0	label = plab->parameter->value.octet_string->data;
90		/* Stop label being freed when OAEP parameters are freed */
91	0	plab->parameter->value.octet_string->data = NULL;
92	0	labellen = plab->parameter->value.octet_string->length;
93	0	}
94
95	0	if (EVP_PKEY_CTX_set_rsa_padding(pkctx, RSA_PKCS1_OAEP_PADDING) <= 0)
96	0	goto err;
97	0	if (EVP_PKEY_CTX_set_rsa_oaep_md(pkctx, md) <= 0)
98	0	goto err;
99	0	if (EVP_PKEY_CTX_set_rsa_mgf1_md(pkctx, mgf1md) <= 0)
100	0	goto err;
101	0	if (label != NULL
102	0	&& EVP_PKEY_CTX_set0_rsa_oaep_label(pkctx, label, labellen) <= 0)
103	0	goto err;
104		/* Carry on */
105	0	rv = 1;
106
107	0	err:
108	0	RSA_OAEP_PARAMS_free(oaep);
109	0	return rv;
110	0	}
111
112		static int rsa_cms_encrypt(CMS_RecipientInfo *ri)
113	0	{
114	0	const EVP_MD md, mgf1md;
115	0	RSA_OAEP_PARAMS *oaep = NULL;
116	0	ASN1_STRING *os = NULL;
117	0	X509_ALGOR *alg;
118	0	EVP_PKEY_CTX *pkctx = CMS_RecipientInfo_get0_pkey_ctx(ri);
119	0	int pad_mode = RSA_PKCS1_PADDING, rv = 0, labellen;
120	0	unsigned char *label;
121
122	0	if (CMS_RecipientInfo_ktri_get0_algs(ri, NULL, NULL, &alg) <= 0)
123	0	return 0;
124	0	if (pkctx != NULL) {
125	0	if (EVP_PKEY_CTX_get_rsa_padding(pkctx, &pad_mode) <= 0)
126	0	return 0;
127	0	}
128	0	if (pad_mode == RSA_PKCS1_PADDING) {
129	0	X509_ALGOR_set0(alg, OBJ_nid2obj(NID_rsaEncryption), V_ASN1_NULL, 0);
130	0	return 1;
131	0	}
132		/* Not supported */
133	0	if (pad_mode != RSA_PKCS1_OAEP_PADDING)
134	0	return 0;
135	0	if (EVP_PKEY_CTX_get_rsa_oaep_md(pkctx, &md) <= 0)
136	0	goto err;
137	0	if (EVP_PKEY_CTX_get_rsa_mgf1_md(pkctx, &mgf1md) <= 0)
138	0	goto err;
139	0	labellen = EVP_PKEY_CTX_get0_rsa_oaep_label(pkctx, &label);
140	0	if (labellen < 0)
141	0	goto err;
142	0	oaep = RSA_OAEP_PARAMS_new();
143	0	if (oaep == NULL)
144	0	goto err;
145	0	if (!ossl_x509_algor_new_from_md(&oaep->hashFunc, md))
146	0	goto err;
147	0	if (!ossl_x509_algor_md_to_mgf1(&oaep->maskGenFunc, mgf1md))
148	0	goto err;
149	0	if (labellen > 0) {
150	0	ASN1_OCTET_STRING *los;
151
152	0	oaep->pSourceFunc = X509_ALGOR_new();
153	0	if (oaep->pSourceFunc == NULL)
154	0	goto err;
155	0	los = ASN1_OCTET_STRING_new();
156	0	if (los == NULL)
157	0	goto err;
158	0	if (!ASN1_OCTET_STRING_set(los, label, labellen)) {
159	0	ASN1_OCTET_STRING_free(los);
160	0	goto err;
161	0	}
162	0	X509_ALGOR_set0(oaep->pSourceFunc, OBJ_nid2obj(NID_pSpecified),
163	0	V_ASN1_OCTET_STRING, los);
164	0	}
165		/* create string with pss parameter encoding. */
166	0	if (!ASN1_item_pack(oaep, ASN1_ITEM_rptr(RSA_OAEP_PARAMS), &os))
167	0	goto err;
168	0	X509_ALGOR_set0(alg, OBJ_nid2obj(NID_rsaesOaep), V_ASN1_SEQUENCE, os);
169	0	os = NULL;
170	0	rv = 1;
171	0	err:
172	0	RSA_OAEP_PARAMS_free(oaep);
173	0	ASN1_STRING_free(os);
174	0	return rv;
175	0	}
176
177		int ossl_cms_rsa_envelope(CMS_RecipientInfo *ri, int decrypt)
178	0	{
179	0	assert(decrypt == 0 \|\| decrypt == 1);
180
181	0	if (decrypt == 1)
182	0	return rsa_cms_decrypt(ri);
183
184	0	if (decrypt == 0)
185	0	return rsa_cms_encrypt(ri);
186
187	0	ERR_raise(ERR_LIB_CMS, CMS_R_NOT_SUPPORTED_FOR_THIS_KEY_TYPE);
188	0	return 0;
189	0	}
190
191		static int rsa_cms_sign(CMS_SignerInfo *si)
192	0	{
193	0	int pad_mode = RSA_PKCS1_PADDING;
194	0	X509_ALGOR *alg;
195	0	EVP_PKEY_CTX *pkctx = CMS_SignerInfo_get0_pkey_ctx(si);
196	0	unsigned char aid[128];
197	0	const unsigned char *pp = aid;
198	0	size_t aid_len = 0;
199	0	OSSL_PARAM params[2];
200
201	0	CMS_SignerInfo_get0_algs(si, NULL, NULL, NULL, &alg);
202	0	if (pkctx != NULL) {
203	0	if (EVP_PKEY_CTX_get_rsa_padding(pkctx, &pad_mode) <= 0)
204	0	return 0;
205	0	}
206	0	if (pad_mode == RSA_PKCS1_PADDING) {
207	0	X509_ALGOR_set0(alg, OBJ_nid2obj(NID_rsaEncryption), V_ASN1_NULL, 0);
208	0	return 1;
209	0	}
210		/* We don't support it */
211	0	if (pad_mode != RSA_PKCS1_PSS_PADDING)
212	0	return 0;
213
214	0	if (evp_pkey_ctx_is_legacy(pkctx)) {
215		/* No provider -> we cannot query it for algorithm ID. */
216	0	ASN1_STRING *os = NULL;
217
218	0	os = ossl_rsa_ctx_to_pss_string(pkctx);
219	0	if (os == NULL)
220	0	return 0;
221	0	return X509_ALGOR_set0(alg, OBJ_nid2obj(EVP_PKEY_RSA_PSS), V_ASN1_SEQUENCE, os);
222	0	}
223
224	0	params[0] = OSSL_PARAM_construct_octet_string(
225	0	OSSL_SIGNATURE_PARAM_ALGORITHM_ID, aid, sizeof(aid));
226	0	params[1] = OSSL_PARAM_construct_end();
227
228	0	if (EVP_PKEY_CTX_get_params(pkctx, params) <= 0)
229	0	return 0;
230	0	if ((aid_len = params[0].return_size) == 0)
231	0	return 0;
232	0	if (d2i_X509_ALGOR(&alg, &pp, aid_len) == NULL)
233	0	return 0;
234	0	return 1;
235	0	}
236
237		static int rsa_cms_verify(CMS_SignerInfo *si)
238	0	{
239	0	int nid, nid2;
240	0	X509_ALGOR *alg;
241	0	EVP_PKEY_CTX *pkctx = CMS_SignerInfo_get0_pkey_ctx(si);
242	0	EVP_PKEY *pkey = EVP_PKEY_CTX_get0_pkey(pkctx);
243
244	0	CMS_SignerInfo_get0_algs(si, NULL, NULL, NULL, &alg);
245	0	nid = OBJ_obj2nid(alg->algorithm);
246	0	if (nid == EVP_PKEY_RSA_PSS)
247	0	return ossl_rsa_pss_to_ctx(NULL, pkctx, alg, NULL) > 0;
248		/* Only PSS allowed for PSS keys */
249	0	if (EVP_PKEY_is_a(pkey, "RSA-PSS")) {
250	0	ERR_raise(ERR_LIB_RSA, RSA_R_ILLEGAL_OR_UNSUPPORTED_PADDING_MODE);
251	0	return 0;
252	0	}
253	0	if (nid == NID_rsaEncryption)
254	0	return 1;
255		/* Workaround for some implementation that use a signature OID */
256	0	if (OBJ_find_sigid_algs(nid, NULL, &nid2)) {
257	0	if (nid2 == NID_rsaEncryption)
258	0	return 1;
259	0	}
260	0	return 0;
261	0	}
262
263		int ossl_cms_rsa_sign(CMS_SignerInfo *si, int verify)
264	0	{
265	0	assert(verify == 0 \|\| verify == 1);
266
267	0	if (verify == 1)
268	0	return rsa_cms_verify(si);
269
270	0	if (verify == 0)
271	0	return rsa_cms_sign(si);
272
273	0	ERR_raise(ERR_LIB_CMS, CMS_R_NOT_SUPPORTED_FOR_THIS_KEY_TYPE);
274	0	return 0;
275	0	}