/src/openssl111/crypto/sm2/sm2_pmeth.c

Source (jump to first uncovered line)
/*
 * Copyright 2006-2021 The OpenSSL Project Authors. All Rights Reserved.
 *
 * Licensed under the OpenSSL license (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 "internal/cryptlib.h"
#include <openssl/asn1t.h>
#include <openssl/ec.h>
#include <openssl/evp.h>
#include "crypto/evp.h"
#include "crypto/sm2.h"
#include "crypto/sm2err.h"

/* EC pkey context structure */

typedef struct {
    /* Key and paramgen group */
    EC_GROUP *gen_group;
    /* message digest */
    const EVP_MD *md;
    /* Distinguishing Identifier, ISO/IEC 15946-3 */
    uint8_t *id;
    size_t id_len;
    /* id_set indicates if the 'id' field is set (1) or not (0) */
    int id_set;
} SM2_PKEY_CTX;

static int pkey_sm2_init(EVP_PKEY_CTX *ctx)
{
    SM2_PKEY_CTX *smctx;

    if ((smctx = OPENSSL_zalloc(sizeof(*smctx))) == NULL) {
        SM2err(SM2_F_PKEY_SM2_INIT, ERR_R_MALLOC_FAILURE);
        return 0;
    }

    ctx->data = smctx;
    return 1;
}

static void pkey_sm2_cleanup(EVP_PKEY_CTX *ctx)
{
    SM2_PKEY_CTX *smctx = ctx->data;

    if (smctx != NULL) {
        EC_GROUP_free(smctx->gen_group);
        OPENSSL_free(smctx->id);
        OPENSSL_free(smctx);
        ctx->data = NULL;
    }
}

static int pkey_sm2_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src)
{
    SM2_PKEY_CTX *dctx, *sctx;

    if (!pkey_sm2_init(dst))
        return 0;
    sctx = src->data;
    dctx = dst->data;
    if (sctx->gen_group != NULL) {
        dctx->gen_group = EC_GROUP_dup(sctx->gen_group);
        if (dctx->gen_group == NULL) {
            pkey_sm2_cleanup(dst);
            return 0;
        }
    }
    if (sctx->id != NULL) {
        dctx->id = OPENSSL_malloc(sctx->id_len);
        if (dctx->id == NULL) {
            SM2err(SM2_F_PKEY_SM2_COPY, ERR_R_MALLOC_FAILURE);
            pkey_sm2_cleanup(dst);
            return 0;
        }
        memcpy(dctx->id, sctx->id, sctx->id_len);
    }
    dctx->id_len = sctx->id_len;
    dctx->id_set = sctx->id_set;
    dctx->md = sctx->md;

    return 1;
}

static int pkey_sm2_sign(EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *siglen,
                         const unsigned char *tbs, size_t tbslen)
{
    int ret;
    unsigned int sltmp;
    EC_KEY *ec = ctx->pkey->pkey.ec;
    const int sig_sz = ECDSA_size(ctx->pkey->pkey.ec);

    if (sig_sz <= 0) {
        return 0;
    }

    if (sig == NULL) {
        *siglen = (size_t)sig_sz;
        return 1;
    }

    if (*siglen < (size_t)sig_sz) {
        SM2err(SM2_F_PKEY_SM2_SIGN, SM2_R_BUFFER_TOO_SMALL);
        return 0;
    }

    ret = sm2_sign(tbs, tbslen, sig, &sltmp, ec);

    if (ret <= 0)
        return ret;
    *siglen = (size_t)sltmp;
    return 1;
}

static int pkey_sm2_verify(EVP_PKEY_CTX *ctx,
                           const unsigned char *sig, size_t siglen,
                           const unsigned char *tbs, size_t tbslen)
{
    EC_KEY *ec = ctx->pkey->pkey.ec;

    return sm2_verify(tbs, tbslen, sig, siglen, ec);
}

static int pkey_sm2_encrypt(EVP_PKEY_CTX *ctx,
                            unsigned char *out, size_t *outlen,
                            const unsigned char *in, size_t inlen)
{
    EC_KEY *ec = ctx->pkey->pkey.ec;
    SM2_PKEY_CTX *dctx = ctx->data;
    const EVP_MD *md = (dctx->md == NULL) ? EVP_sm3() : dctx->md;

    if (out == NULL) {
        if (!sm2_ciphertext_size(ec, md, inlen, outlen))
            return -1;
        else
            return 1;
    }

    return sm2_encrypt(ec, md, in, inlen, out, outlen);
}

static int pkey_sm2_decrypt(EVP_PKEY_CTX *ctx,
                            unsigned char *out, size_t *outlen,
                            const unsigned char *in, size_t inlen)
{
    EC_KEY *ec = ctx->pkey->pkey.ec;
    SM2_PKEY_CTX *dctx = ctx->data;
    const EVP_MD *md = (dctx->md == NULL) ? EVP_sm3() : dctx->md;

    if (out == NULL) {
        if (!sm2_plaintext_size(in, inlen, outlen))
            return -1;
        else
            return 1;
    }

    return sm2_decrypt(ec, md, in, inlen, out, outlen);
}

static int pkey_sm2_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
{
    SM2_PKEY_CTX *smctx = ctx->data;
    EC_GROUP *group;
    uint8_t *tmp_id;

    switch (type) {
    case EVP_PKEY_CTRL_EC_PARAMGEN_CURVE_NID:
        group = EC_GROUP_new_by_curve_name(p1);
        if (group == NULL) {
            SM2err(SM2_F_PKEY_SM2_CTRL, SM2_R_INVALID_CURVE);
            return 0;
        }
        EC_GROUP_free(smctx->gen_group);
        smctx->gen_group = group;
        return 1;

    case EVP_PKEY_CTRL_EC_PARAM_ENC:
        if (smctx->gen_group == NULL) {
            SM2err(SM2_F_PKEY_SM2_CTRL, SM2_R_NO_PARAMETERS_SET);
            return 0;
        }
        EC_GROUP_set_asn1_flag(smctx->gen_group, p1);
        return 1;

    case EVP_PKEY_CTRL_MD:
        smctx->md = p2;
        return 1;

    case EVP_PKEY_CTRL_GET_MD:
        *(const EVP_MD **)p2 = smctx->md;
        return 1;

    case EVP_PKEY_CTRL_SET1_ID:
        if (p1 > 0) {
            tmp_id = OPENSSL_malloc(p1);
            if (tmp_id == NULL) {
                SM2err(SM2_F_PKEY_SM2_CTRL, ERR_R_MALLOC_FAILURE);
                return 0;
            }
            memcpy(tmp_id, p2, p1);
            OPENSSL_free(smctx->id);
            smctx->id = tmp_id;
        } else {
            /* set null-ID */
            OPENSSL_free(smctx->id);
            smctx->id = NULL;
        }
        smctx->id_len = (size_t)p1;
        smctx->id_set = 1;
        return 1;

    case EVP_PKEY_CTRL_GET1_ID:
        memcpy(p2, smctx->id, smctx->id_len);
        return 1;

    case EVP_PKEY_CTRL_GET1_ID_LEN:
        *(size_t *)p2 = smctx->id_len;
        return 1;

    case EVP_PKEY_CTRL_DIGESTINIT:
        /* nothing to be inited, this is to suppress the error... */
        return 1;

    default:
        return -2;
    }
}

static int pkey_sm2_ctrl_str(EVP_PKEY_CTX *ctx,
                             const char *type, const char *value)
{
    if (strcmp(type, "ec_paramgen_curve") == 0) {
        int nid = NID_undef;

        if (((nid = EC_curve_nist2nid(value)) == NID_undef)
            && ((nid = OBJ_sn2nid(value)) == NID_undef)
            && ((nid = OBJ_ln2nid(value)) == NID_undef)) {
            SM2err(SM2_F_PKEY_SM2_CTRL_STR, SM2_R_INVALID_CURVE);
            return 0;
        }
        return EVP_PKEY_CTX_set_ec_paramgen_curve_nid(ctx, nid);
    } else if (strcmp(type, "ec_param_enc") == 0) {
        int param_enc;

        if (strcmp(value, "explicit") == 0)
            param_enc = 0;
        else if (strcmp(value, "named_curve") == 0)
            param_enc = OPENSSL_EC_NAMED_CURVE;
        else
            return -2;
        return EVP_PKEY_CTX_set_ec_param_enc(ctx, param_enc);
    }

    return -2;
}

static int pkey_sm2_digest_custom(EVP_PKEY_CTX *ctx, EVP_MD_CTX *mctx)
{
    uint8_t z[EVP_MAX_MD_SIZE];
    SM2_PKEY_CTX *smctx = ctx->data;
    EC_KEY *ec = ctx->pkey->pkey.ec;
    const EVP_MD *md = EVP_MD_CTX_md(mctx);
    int mdlen = EVP_MD_size(md);

    if (!smctx->id_set) {
        /*
         * An ID value must be set. The specifications are not clear whether a
         * NULL is allowed. We only allow it if set explicitly for maximum
         * flexibility.
         */
        SM2err(SM2_F_PKEY_SM2_DIGEST_CUSTOM, SM2_R_ID_NOT_SET);
        return 0;
    }

    if (mdlen < 0) {
        SM2err(SM2_F_PKEY_SM2_DIGEST_CUSTOM, SM2_R_INVALID_DIGEST);
        return 0;
    }

    /* get hashed prefix 'z' of tbs message */
    if (!sm2_compute_z_digest(z, md, smctx->id, smctx->id_len, ec))
        return 0;

    return EVP_DigestUpdate(mctx, z, (size_t)mdlen);
}

const EVP_PKEY_METHOD sm2_pkey_meth = {
    EVP_PKEY_SM2,
    0,
    pkey_sm2_init,
    pkey_sm2_copy,
    pkey_sm2_cleanup,

    0,
    0,

    0,
    0,

    0,
    pkey_sm2_sign,

    0,
    pkey_sm2_verify,

    0, 0,

    0, 0, 0, 0,

    0,
    pkey_sm2_encrypt,

    0,
    pkey_sm2_decrypt,

    0,
    0,
    pkey_sm2_ctrl,
    pkey_sm2_ctrl_str,

    0, 0,

    0, 0, 0,

    pkey_sm2_digest_custom
};

Coverage Report

Created: 2023-09-25 06:41

Line	Count	Source (jump to first uncovered line)
1		/*
2		* Copyright 2006-2021 The OpenSSL Project Authors. All Rights Reserved.
3		*
4		* Licensed under the OpenSSL license (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 "internal/cryptlib.h"
11		#include <openssl/asn1t.h>
12		#include <openssl/ec.h>
13		#include <openssl/evp.h>
14		#include "crypto/evp.h"
15		#include "crypto/sm2.h"
16		#include "crypto/sm2err.h"
17
18		/* EC pkey context structure */
19
20		typedef struct {
21		/* Key and paramgen group */
22		EC_GROUP *gen_group;
23		/* message digest */
24		const EVP_MD *md;
25		/* Distinguishing Identifier, ISO/IEC 15946-3 */
26		uint8_t *id;
27		size_t id_len;
28		/* id_set indicates if the 'id' field is set (1) or not (0) */
29		int id_set;
30		} SM2_PKEY_CTX;
31
32		static int pkey_sm2_init(EVP_PKEY_CTX *ctx)
33	0	{
34	0	SM2_PKEY_CTX *smctx;
35
36	0	if ((smctx = OPENSSL_zalloc(sizeof(*smctx))) == NULL) {
37	0	SM2err(SM2_F_PKEY_SM2_INIT, ERR_R_MALLOC_FAILURE);
38	0	return 0;
39	0	}
40
41	0	ctx->data = smctx;
42	0	return 1;
43	0	}
44
45		static void pkey_sm2_cleanup(EVP_PKEY_CTX *ctx)
46	0	{
47	0	SM2_PKEY_CTX *smctx = ctx->data;
48
49	0	if (smctx != NULL) {
50	0	EC_GROUP_free(smctx->gen_group);
51	0	OPENSSL_free(smctx->id);
52	0	OPENSSL_free(smctx);
53	0	ctx->data = NULL;
54	0	}
55	0	}
56
57		static int pkey_sm2_copy(EVP_PKEY_CTX dst, EVP_PKEY_CTX src)
58	0	{
59	0	SM2_PKEY_CTX dctx, sctx;
60
61	0	if (!pkey_sm2_init(dst))
62	0	return 0;
63	0	sctx = src->data;
64	0	dctx = dst->data;
65	0	if (sctx->gen_group != NULL) {
66	0	dctx->gen_group = EC_GROUP_dup(sctx->gen_group);
67	0	if (dctx->gen_group == NULL) {
68	0	pkey_sm2_cleanup(dst);
69	0	return 0;
70	0	}
71	0	}
72	0	if (sctx->id != NULL) {
73	0	dctx->id = OPENSSL_malloc(sctx->id_len);
74	0	if (dctx->id == NULL) {
75	0	SM2err(SM2_F_PKEY_SM2_COPY, ERR_R_MALLOC_FAILURE);
76	0	pkey_sm2_cleanup(dst);
77	0	return 0;
78	0	}
79	0	memcpy(dctx->id, sctx->id, sctx->id_len);
80	0	}
81	0	dctx->id_len = sctx->id_len;
82	0	dctx->id_set = sctx->id_set;
83	0	dctx->md = sctx->md;
84
85	0	return 1;
86	0	}
87
88		static int pkey_sm2_sign(EVP_PKEY_CTX ctx, unsigned char sig, size_t *siglen,
89		const unsigned char *tbs, size_t tbslen)
90	0	{
91	0	int ret;
92	0	unsigned int sltmp;
93	0	EC_KEY *ec = ctx->pkey->pkey.ec;
94	0	const int sig_sz = ECDSA_size(ctx->pkey->pkey.ec);
95
96	0	if (sig_sz <= 0) {
97	0	return 0;
98	0	}
99
100	0	if (sig == NULL) {
101	0	*siglen = (size_t)sig_sz;
102	0	return 1;
103	0	}
104
105	0	if (*siglen < (size_t)sig_sz) {
106	0	SM2err(SM2_F_PKEY_SM2_SIGN, SM2_R_BUFFER_TOO_SMALL);
107	0	return 0;
108	0	}
109
110	0	ret = sm2_sign(tbs, tbslen, sig, &sltmp, ec);
111
112	0	if (ret <= 0)
113	0	return ret;
114	0	*siglen = (size_t)sltmp;
115	0	return 1;
116	0	}
117
118		static int pkey_sm2_verify(EVP_PKEY_CTX *ctx,
119		const unsigned char *sig, size_t siglen,
120		const unsigned char *tbs, size_t tbslen)
121	0	{
122	0	EC_KEY *ec = ctx->pkey->pkey.ec;
123
124	0	return sm2_verify(tbs, tbslen, sig, siglen, ec);
125	0	}
126
127		static int pkey_sm2_encrypt(EVP_PKEY_CTX *ctx,
128		unsigned char out, size_t outlen,
129		const unsigned char *in, size_t inlen)
130	0	{
131	0	EC_KEY *ec = ctx->pkey->pkey.ec;
132	0	SM2_PKEY_CTX *dctx = ctx->data;
133	0	const EVP_MD *md = (dctx->md == NULL) ? EVP_sm3() : dctx->md;
134
135	0	if (out == NULL) {
136	0	if (!sm2_ciphertext_size(ec, md, inlen, outlen))
137	0	return -1;
138	0	else
139	0	return 1;
140	0	}
141
142	0	return sm2_encrypt(ec, md, in, inlen, out, outlen);
143	0	}
144
145		static int pkey_sm2_decrypt(EVP_PKEY_CTX *ctx,
146		unsigned char out, size_t outlen,
147		const unsigned char *in, size_t inlen)
148	0	{
149	0	EC_KEY *ec = ctx->pkey->pkey.ec;
150	0	SM2_PKEY_CTX *dctx = ctx->data;
151	0	const EVP_MD *md = (dctx->md == NULL) ? EVP_sm3() : dctx->md;
152
153	0	if (out == NULL) {
154	0	if (!sm2_plaintext_size(in, inlen, outlen))
155	0	return -1;
156	0	else
157	0	return 1;
158	0	}
159
160	0	return sm2_decrypt(ec, md, in, inlen, out, outlen);
161	0	}
162
163		static int pkey_sm2_ctrl(EVP_PKEY_CTX ctx, int type, int p1, void p2)
164	0	{
165	0	SM2_PKEY_CTX *smctx = ctx->data;
166	0	EC_GROUP *group;
167	0	uint8_t *tmp_id;
168
169	0	switch (type) {
170	0	case EVP_PKEY_CTRL_EC_PARAMGEN_CURVE_NID:
171	0	group = EC_GROUP_new_by_curve_name(p1);
172	0	if (group == NULL) {
173	0	SM2err(SM2_F_PKEY_SM2_CTRL, SM2_R_INVALID_CURVE);
174	0	return 0;
175	0	}
176	0	EC_GROUP_free(smctx->gen_group);
177	0	smctx->gen_group = group;
178	0	return 1;
179
180	0	case EVP_PKEY_CTRL_EC_PARAM_ENC:
181	0	if (smctx->gen_group == NULL) {
182	0	SM2err(SM2_F_PKEY_SM2_CTRL, SM2_R_NO_PARAMETERS_SET);
183	0	return 0;
184	0	}
185	0	EC_GROUP_set_asn1_flag(smctx->gen_group, p1);
186	0	return 1;
187
188	0	case EVP_PKEY_CTRL_MD:
189	0	smctx->md = p2;
190	0	return 1;
191
192	0	case EVP_PKEY_CTRL_GET_MD:
193	0	(const EVP_MD *)p2 = smctx->md;
194	0	return 1;
195
196	0	case EVP_PKEY_CTRL_SET1_ID:
197	0	if (p1 > 0) {
198	0	tmp_id = OPENSSL_malloc(p1);
199	0	if (tmp_id == NULL) {
200	0	SM2err(SM2_F_PKEY_SM2_CTRL, ERR_R_MALLOC_FAILURE);
201	0	return 0;
202	0	}
203	0	memcpy(tmp_id, p2, p1);
204	0	OPENSSL_free(smctx->id);
205	0	smctx->id = tmp_id;
206	0	} else {
207		/* set null-ID */
208	0	OPENSSL_free(smctx->id);
209	0	smctx->id = NULL;
210	0	}
211	0	smctx->id_len = (size_t)p1;
212	0	smctx->id_set = 1;
213	0	return 1;
214
215	0	case EVP_PKEY_CTRL_GET1_ID:
216	0	memcpy(p2, smctx->id, smctx->id_len);
217	0	return 1;
218
219	0	case EVP_PKEY_CTRL_GET1_ID_LEN:
220	0	(size_t )p2 = smctx->id_len;
221	0	return 1;
222
223	0	case EVP_PKEY_CTRL_DIGESTINIT:
224		/* nothing to be inited, this is to suppress the error... */
225	0	return 1;
226
227	0	default:
228	0	return -2;
229	0	}
230	0	}
231
232		static int pkey_sm2_ctrl_str(EVP_PKEY_CTX *ctx,
233		const char type, const char value)
234	0	{
235	0	if (strcmp(type, "ec_paramgen_curve") == 0) {
236	0	int nid = NID_undef;
237
238	0	if (((nid = EC_curve_nist2nid(value)) == NID_undef)
239	0	&& ((nid = OBJ_sn2nid(value)) == NID_undef)
240	0	&& ((nid = OBJ_ln2nid(value)) == NID_undef)) {
241	0	SM2err(SM2_F_PKEY_SM2_CTRL_STR, SM2_R_INVALID_CURVE);
242	0	return 0;
243	0	}
244	0	return EVP_PKEY_CTX_set_ec_paramgen_curve_nid(ctx, nid);
245	0	} else if (strcmp(type, "ec_param_enc") == 0) {
246	0	int param_enc;
247
248	0	if (strcmp(value, "explicit") == 0)
249	0	param_enc = 0;
250	0	else if (strcmp(value, "named_curve") == 0)
251	0	param_enc = OPENSSL_EC_NAMED_CURVE;
252	0	else
253	0	return -2;
254	0	return EVP_PKEY_CTX_set_ec_param_enc(ctx, param_enc);
255	0	}
256
257	0	return -2;
258	0	}
259
260		static int pkey_sm2_digest_custom(EVP_PKEY_CTX ctx, EVP_MD_CTX mctx)
261	0	{
262	0	uint8_t z[EVP_MAX_MD_SIZE];
263	0	SM2_PKEY_CTX *smctx = ctx->data;
264	0	EC_KEY *ec = ctx->pkey->pkey.ec;
265	0	const EVP_MD *md = EVP_MD_CTX_md(mctx);
266	0	int mdlen = EVP_MD_size(md);
267
268	0	if (!smctx->id_set) {
269		/*
270		* An ID value must be set. The specifications are not clear whether a
271		* NULL is allowed. We only allow it if set explicitly for maximum
272		* flexibility.
273		*/
274	0	SM2err(SM2_F_PKEY_SM2_DIGEST_CUSTOM, SM2_R_ID_NOT_SET);
275	0	return 0;
276	0	}
277
278	0	if (mdlen < 0) {
279	0	SM2err(SM2_F_PKEY_SM2_DIGEST_CUSTOM, SM2_R_INVALID_DIGEST);
280	0	return 0;
281	0	}
282
283		/* get hashed prefix 'z' of tbs message */
284	0	if (!sm2_compute_z_digest(z, md, smctx->id, smctx->id_len, ec))
285	0	return 0;
286
287	0	return EVP_DigestUpdate(mctx, z, (size_t)mdlen);
288	0	}
289
290		const EVP_PKEY_METHOD sm2_pkey_meth = {
291		EVP_PKEY_SM2,
292		0,
293		pkey_sm2_init,
294		pkey_sm2_copy,
295		pkey_sm2_cleanup,
296
297		0,
298		0,
299
300		0,
301		0,
302
303		0,
304		pkey_sm2_sign,
305
306		0,
307		pkey_sm2_verify,
308
309		0, 0,
310
311		0, 0, 0, 0,
312
313		0,
314		pkey_sm2_encrypt,
315
316		0,
317		pkey_sm2_decrypt,
318
319		0,
320		0,
321		pkey_sm2_ctrl,
322		pkey_sm2_ctrl_str,
323
324		0, 0,
325
326		0, 0, 0,
327
328		pkey_sm2_digest_custom
329		};