[thirdparty/openssl.git] / crypto / sm2 / sm2_pmeth.c

/*
 * Copyright 2006-2020 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
 */

/*
 * ECDSA low level APIs are deprecated for public use, but still ok for
 * internal use.
 */
#include "internal/deprecated.h"

#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"
#include "crypto/ec.h"

/* EC pkey context structure */

typedef struct {
    /* message digest */
    const EVP_MD *md;
    /* Distinguishing Identifier, ISO/IEC 15946-3, FIPS 196 */
    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) {
        OPENSSL_free(smctx->id);
        OPENSSL_free(smctx);
        ctx->data = NULL;
    }
}

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

    if (!pkey_sm2_init(dst))
        return 0;
    sctx = src->data;
    dctx = dst->data;
    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_internal_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_internal_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)
{
    int ret;
    EC_KEY *ec = ctx->pkey->pkey.ec;
    SM2_PKEY_CTX *dctx = ctx->data;
    const EVP_MD *md = (dctx->md == NULL) ? EVP_sm3() : dctx->md;
    OPENSSL_CTX *libctx = ec_key_get_libctx(ec);
    EVP_MD *fetched_md = NULL;

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

    fetched_md = EVP_MD_fetch(libctx, EVP_MD_name(md), 0);
    if (fetched_md == NULL)
        return 0;
    ret = sm2_encrypt(ec, fetched_md, in, inlen, out, outlen);
    EVP_MD_free(fetched_md);
    return ret;
}

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

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

    fetched_md = EVP_MD_fetch(libctx, EVP_MD_name(md), 0);
    if (fetched_md == NULL)
        return 0;
    ret = sm2_decrypt(ec, fetched_md, in, inlen, out, outlen);
    EVP_MD_free(fetched_md);
    return ret;
}

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

    switch (type) {
    case EVP_PKEY_CTRL_EC_PARAMGEN_CURVE_NID:
        /*
         * This control could be removed, which would signal it being
         * unsupported.  However, that means that when the caller uses
         * the correct curve, it may interpret the unsupported signal
         * as an error, so it's better to accept the control, check the
         * value and return a corresponding value.
         */
        if (p1 != NID_sm2) {
            SM2err(SM2_F_PKEY_SM2_CTRL, SM2_R_INVALID_CURVE);
            return 0;
        }
        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)
{
    uint8_t *hex_id;
    long hex_len = 0;
    int ret = 0;

    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);
    } else if (strcmp(type, "distid") == 0) {
        return pkey_sm2_ctrl(ctx, EVP_PKEY_CTRL_SET1_ID,
                             (int)strlen(value), (void *)value);
    } else if (strcmp(type, "hexdistid") == 0) {
        hex_id = OPENSSL_hexstr2buf((const char *)value, &hex_len);
        if (hex_id == NULL) {
            SM2err(SM2_F_PKEY_SM2_CTRL_STR, ERR_R_PASSED_INVALID_ARGUMENT);
            return 0;
        }
        ret = pkey_sm2_ctrl(ctx, EVP_PKEY_CTRL_SET1_ID, (int)hex_len,
                            (void *)hex_id);
        OPENSSL_free(hex_id);
        return ret;
    }

    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);
}

static int pkey_sm2_paramgen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
{
    EC_KEY *ec = NULL;
    int ret;

    ec = EC_KEY_new_by_curve_name(NID_sm2);
    if (ec == NULL)
        return 0;
    if (!ossl_assert(ret = EVP_PKEY_assign_EC_KEY(pkey, ec)))
        EC_KEY_free(ec);
    return ret;
}

static int pkey_sm2_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
{
    EC_KEY *ec = NULL;

    ec = EC_KEY_new_by_curve_name(NID_sm2);
    if (ec == NULL)
        return 0;
    if (!ossl_assert(EVP_PKEY_assign_EC_KEY(pkey, ec))) {
        EC_KEY_free(ec);
        return 0;
    }
    /* Note: if error is returned, we count on caller to free pkey->pkey.ec */
    if (ctx->pkey != NULL
        && !EVP_PKEY_copy_parameters(pkey, ctx->pkey))
        return 0;

    return EC_KEY_generate_key(ec);
}

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

    0,
    pkey_sm2_paramgen,

    0,
    pkey_sm2_keygen,

    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
};

const EVP_PKEY_METHOD *sm2_pkey_method(void)
{
    return &sm2_pkey_meth;
}
Commit	Line	Data
ddb634fe	1	/*
33388b44	2	* Copyright 2006-2020 The OpenSSL Project Authors. All Rights Reserved.
ddb634fe	3	*
f9f859ad	4	* Licensed under the Apache License 2.0 (the "License"). You may not use
ddb634fe JL	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
579422c8 P	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
ddb634fe JL	16	#include "internal/cryptlib.h"
	17	#include <openssl/asn1t.h>
	18	#include <openssl/ec.h>
	19	#include <openssl/evp.h>
25f2138b DMSP	20	#include "crypto/evp.h"
	21	#include "crypto/sm2.h"
	22	#include "crypto/sm2err.h"
5ccada09	23	#include "crypto/ec.h"
ddb634fe JL	24
	25	/* EC pkey context structure */
	26
	27	typedef struct {
ddb634fe JL	28	/* message digest */
ddb634fe JL	29	const EVP_MD *md;
123c2fef	30	/* Distinguishing Identifier, ISO/IEC 15946-3, FIPS 196 */
00433bad PY	31	uint8_t *id;
00433bad PY	32	size_t id_len;
4803717f PY	33	/* id_set indicates if the 'id' field is set (1) or not (0) */
4803717f PY	34	int id_set;
ddb634fe JL	35	} SM2_PKEY_CTX;
	36
	37	static int pkey_sm2_init(EVP_PKEY_CTX *ctx)
	38	{
4803717f	39	SM2_PKEY_CTX *smctx;
ddb634fe	40
4803717f	41	if ((smctx = OPENSSL_zalloc(sizeof(*smctx))) == NULL) {
ddb634fe JL	42	SM2err(SM2_F_PKEY_SM2_INIT, ERR_R_MALLOC_FAILURE);
	43	return 0;
	44	}
	45
4803717f	46	ctx->data = smctx;
ddb634fe JL	47	return 1;
	48	}
	49
	50	static void pkey_sm2_cleanup(EVP_PKEY_CTX *ctx)
	51	{
4803717f	52	SM2_PKEY_CTX *smctx = ctx->data;
ddb634fe	53
4803717f	54	if (smctx != NULL) {
4803717f PY	55	OPENSSL_free(smctx->id);
4803717f PY	56	OPENSSL_free(smctx);
ddb634fe JL	57	ctx->data = NULL;
	58	}
	59	}
	60
9fdcc21f	61	static int pkey_sm2_copy(EVP_PKEY_CTX dst, const EVP_PKEY_CTX src)
ddb634fe JL	62	{
	63	SM2_PKEY_CTX dctx, sctx;
	64
	65	if (!pkey_sm2_init(dst))
	66	return 0;
	67	sctx = src->data;
	68	dctx = dst->data;
4803717f PY	69	if (sctx->id != NULL) {
	70	dctx->id = OPENSSL_malloc(sctx->id_len);
	71	if (dctx->id == NULL) {
f922dac8	72	SM2err(SM2_F_PKEY_SM2_COPY, ERR_R_MALLOC_FAILURE);
4803717f PY	73	pkey_sm2_cleanup(dst);
	74	return 0;
	75	}
	76	memcpy(dctx->id, sctx->id, sctx->id_len);
	77	}
	78	dctx->id_len = sctx->id_len;
	79	dctx->id_set = sctx->id_set;
ddb634fe JL	80	dctx->md = sctx->md;
	81
	82	return 1;
	83	}
	84
	85	static int pkey_sm2_sign(EVP_PKEY_CTX ctx, unsigned char sig, size_t *siglen,
	86	const unsigned char *tbs, size_t tbslen)
	87	{
	88	int ret;
	89	unsigned int sltmp;
	90	EC_KEY *ec = ctx->pkey->pkey.ec;
	91	const int sig_sz = ECDSA_size(ctx->pkey->pkey.ec);
	92
	93	if (sig_sz <= 0) {
	94	return 0;
	95	}
	96
	97	if (sig == NULL) {
	98	*siglen = (size_t)sig_sz;
	99	return 1;
	100	}
	101
	102	if (*siglen < (size_t)sig_sz) {
	103	SM2err(SM2_F_PKEY_SM2_SIGN, SM2_R_BUFFER_TOO_SMALL);
	104	return 0;
	105	}
	106
d0b79f86	107	ret = sm2_internal_sign(tbs, tbslen, sig, &sltmp, ec);
ddb634fe JL	108
	109	if (ret <= 0)
	110	return ret;
	111	*siglen = (size_t)sltmp;
	112	return 1;
	113	}
	114
	115	static int pkey_sm2_verify(EVP_PKEY_CTX *ctx,
	116	const unsigned char *sig, size_t siglen,
	117	const unsigned char *tbs, size_t tbslen)
	118	{
	119	EC_KEY *ec = ctx->pkey->pkey.ec;
	120
d0b79f86	121	return sm2_internal_verify(tbs, tbslen, sig, siglen, ec);
ddb634fe JL	122	}
	123
	124	static int pkey_sm2_encrypt(EVP_PKEY_CTX *ctx,
	125	unsigned char out, size_t outlen,
	126	const unsigned char *in, size_t inlen)
	127	{
5ccada09	128	int ret;
ddb634fe JL	129	EC_KEY *ec = ctx->pkey->pkey.ec;
	130	SM2_PKEY_CTX *dctx = ctx->data;
	131	const EVP_MD *md = (dctx->md == NULL) ? EVP_sm3() : dctx->md;
5ccada09 SL	132	OPENSSL_CTX *libctx = ec_key_get_libctx(ec);
5ccada09 SL	133	EVP_MD *fetched_md = NULL;
ddb634fe JL	134
	135	if (out == NULL) {
	136	if (!sm2_ciphertext_size(ec, md, inlen, outlen))
	137	return -1;
	138	else
	139	return 1;
	140	}
	141
5ccada09 SL	142	fetched_md = EVP_MD_fetch(libctx, EVP_MD_name(md), 0);
	143	if (fetched_md == NULL)
	144	return 0;
	145	ret = sm2_encrypt(ec, fetched_md, in, inlen, out, outlen);
	146	EVP_MD_free(fetched_md);
	147	return ret;
ddb634fe JL	148	}
	149
	150	static int pkey_sm2_decrypt(EVP_PKEY_CTX *ctx,
	151	unsigned char out, size_t outlen,
	152	const unsigned char *in, size_t inlen)
	153	{
5ccada09	154	int ret;
ddb634fe JL	155	EC_KEY *ec = ctx->pkey->pkey.ec;
	156	SM2_PKEY_CTX *dctx = ctx->data;
	157	const EVP_MD *md = (dctx->md == NULL) ? EVP_sm3() : dctx->md;
5ccada09 SL	158	OPENSSL_CTX *libctx = ec_key_get_libctx(ec);
5ccada09 SL	159	EVP_MD *fetched_md = NULL;
ddb634fe JL	160
	161	if (out == NULL) {
	162	if (!sm2_plaintext_size(ec, md, inlen, outlen))
	163	return -1;
	164	else
	165	return 1;
	166	}
	167
5ccada09 SL	168	fetched_md = EVP_MD_fetch(libctx, EVP_MD_name(md), 0);
	169	if (fetched_md == NULL)
	170	return 0;
	171	ret = sm2_decrypt(ec, fetched_md, in, inlen, out, outlen);
	172	EVP_MD_free(fetched_md);
	173	return ret;
ddb634fe JL	174	}
	175
	176	static int pkey_sm2_ctrl(EVP_PKEY_CTX ctx, int type, int p1, void p2)
	177	{
4803717f	178	SM2_PKEY_CTX *smctx = ctx->data;
675f4cee	179	uint8_t *tmp_id;
ddb634fe JL	180
	181	switch (type) {
	182	case EVP_PKEY_CTRL_EC_PARAMGEN_CURVE_NID:
0943d5dd RL	183	/*
	184	* This control could be removed, which would signal it being
	185	* unsupported. However, that means that when the caller uses
	186	* the correct curve, it may interpret the unsupported signal
	187	* as an error, so it's better to accept the control, check the
	188	* value and return a corresponding value.
	189	*/
	190	if (p1 != NID_sm2) {
ddb634fe JL	191	SM2err(SM2_F_PKEY_SM2_CTRL, SM2_R_INVALID_CURVE);
	192	return 0;
	193	}
ddb634fe JL	194	return 1;
	195
	196	case EVP_PKEY_CTRL_MD:
4803717f	197	smctx->md = p2;
ddb634fe JL	198	return 1;
	199
	200	case EVP_PKEY_CTRL_GET_MD:
4803717f PY	201	(const EVP_MD *)p2 = smctx->md;
	202	return 1;
	203
	204	case EVP_PKEY_CTRL_SET1_ID:
4803717f	205	if (p1 > 0) {
675f4cee	206	tmp_id = OPENSSL_malloc(p1);
f922dac8 PY	207	if (tmp_id == NULL) {
f922dac8 PY	208	SM2err(SM2_F_PKEY_SM2_CTRL, ERR_R_MALLOC_FAILURE);
4803717f	209	return 0;
f922dac8	210	}
675f4cee PY	211	memcpy(tmp_id, p2, p1);
	212	OPENSSL_free(smctx->id);
	213	smctx->id = tmp_id;
4803717f PY	214	} else {
4803717f PY	215	/* set null-ID */
675f4cee	216	OPENSSL_free(smctx->id);
4803717f PY	217	smctx->id = NULL;
	218	}
	219	smctx->id_len = (size_t)p1;
	220	smctx->id_set = 1;
	221	return 1;
	222
	223	case EVP_PKEY_CTRL_GET1_ID:
	224	memcpy(p2, smctx->id, smctx->id_len);
	225	return 1;
	226
	227	case EVP_PKEY_CTRL_GET1_ID_LEN:
	228	(size_t )p2 = smctx->id_len;
ddb634fe JL	229	return 1;
ddb634fe JL	230
8267becb	231	case EVP_PKEY_CTRL_DIGESTINIT:
	232	/* nothing to be inited, this is to suppress the error... */
	233	return 1;
	234
ddb634fe JL	235	default:
ddb634fe JL	236	return -2;
ddb634fe JL	237	}
	238	}
	239
	240	static int pkey_sm2_ctrl_str(EVP_PKEY_CTX *ctx,
	241	const char type, const char value)
	242	{
a45eb7e8 PY	243	uint8_t *hex_id;
	244	long hex_len = 0;
	245	int ret = 0;
	246
ddb634fe JL	247	if (strcmp(type, "ec_paramgen_curve") == 0) {
	248	int nid = NID_undef;
	249
	250	if (((nid = EC_curve_nist2nid(value)) == NID_undef)
	251	&& ((nid = OBJ_sn2nid(value)) == NID_undef)
	252	&& ((nid = OBJ_ln2nid(value)) == NID_undef)) {
	253	SM2err(SM2_F_PKEY_SM2_CTRL_STR, SM2_R_INVALID_CURVE);
	254	return 0;
	255	}
	256	return EVP_PKEY_CTX_set_ec_paramgen_curve_nid(ctx, nid);
	257	} else if (strcmp(type, "ec_param_enc") == 0) {
	258	int param_enc;
	259
	260	if (strcmp(value, "explicit") == 0)
	261	param_enc = 0;
	262	else if (strcmp(value, "named_curve") == 0)
	263	param_enc = OPENSSL_EC_NAMED_CURVE;
	264	else
	265	return -2;
	266	return EVP_PKEY_CTX_set_ec_param_enc(ctx, param_enc);
123c2fef	267	} else if (strcmp(type, "distid") == 0) {
a7cef52f PY	268	return pkey_sm2_ctrl(ctx, EVP_PKEY_CTRL_SET1_ID,
a7cef52f PY	269	(int)strlen(value), (void *)value);
123c2fef	270	} else if (strcmp(type, "hexdistid") == 0) {
a45eb7e8 PY	271	hex_id = OPENSSL_hexstr2buf((const char *)value, &hex_len);
	272	if (hex_id == NULL) {
	273	SM2err(SM2_F_PKEY_SM2_CTRL_STR, ERR_R_PASSED_INVALID_ARGUMENT);
	274	return 0;
	275	}
	276	ret = pkey_sm2_ctrl(ctx, EVP_PKEY_CTRL_SET1_ID, (int)hex_len,
	277	(void *)hex_id);
	278	OPENSSL_free(hex_id);
	279	return ret;
ddb634fe JL	280	}
	281
	282	return -2;
	283	}
	284
00433bad PY	285	static int pkey_sm2_digest_custom(EVP_PKEY_CTX ctx, EVP_MD_CTX mctx)
	286	{
	287	uint8_t z[EVP_MAX_MD_SIZE];
4803717f	288	SM2_PKEY_CTX *smctx = ctx->data;
00433bad PY	289	EC_KEY *ec = ctx->pkey->pkey.ec;
00433bad PY	290	const EVP_MD *md = EVP_MD_CTX_md(mctx);
d689f313	291	int mdlen = EVP_MD_size(md);
00433bad	292
4803717f PY	293	if (!smctx->id_set) {
	294	/*
	295	* An ID value must be set. The specifications are not clear whether a
	296	* NULL is allowed. We only allow it if set explicitly for maximum
	297	* flexibility.
00433bad	298	*/
675f4cee	299	SM2err(SM2_F_PKEY_SM2_DIGEST_CUSTOM, SM2_R_ID_NOT_SET);
00433bad PY	300	return 0;
	301	}
	302
d689f313 MC	303	if (mdlen < 0) {
	304	SM2err(SM2_F_PKEY_SM2_DIGEST_CUSTOM, SM2_R_INVALID_DIGEST);
	305	return 0;
	306	}
	307
4803717f PY	308	/* get hashed prefix 'z' of tbs message */
4803717f PY	309	if (!sm2_compute_z_digest(z, md, smctx->id, smctx->id_len, ec))
00433bad PY	310	return 0;
00433bad PY	311
d689f313	312	return EVP_DigestUpdate(mctx, z, (size_t)mdlen);
00433bad PY	313	}
00433bad PY	314
0943d5dd RL	315	static int pkey_sm2_paramgen(EVP_PKEY_CTX ctx, EVP_PKEY pkey)
	316	{
	317	EC_KEY *ec = NULL;
	318	int ret;
	319
	320	ec = EC_KEY_new_by_curve_name(NID_sm2);
	321	if (ec == NULL)
	322	return 0;
	323	if (!ossl_assert(ret = EVP_PKEY_assign_EC_KEY(pkey, ec)))
	324	EC_KEY_free(ec);
	325	return ret;
	326	}
	327
	328	static int pkey_sm2_keygen(EVP_PKEY_CTX ctx, EVP_PKEY pkey)
	329	{
	330	EC_KEY *ec = NULL;
	331
	332	ec = EC_KEY_new_by_curve_name(NID_sm2);
	333	if (ec == NULL)
	334	return 0;
	335	if (!ossl_assert(EVP_PKEY_assign_EC_KEY(pkey, ec))) {
	336	EC_KEY_free(ec);
	337	return 0;
	338	}
	339	/* Note: if error is returned, we count on caller to free pkey->pkey.ec */
	340	if (ctx->pkey != NULL
	341	&& !EVP_PKEY_copy_parameters(pkey, ctx->pkey))
	342	return 0;
	343
	344	return EC_KEY_generate_key(ec);
	345	}
	346
19bd1fa1	347	static const EVP_PKEY_METHOD sm2_pkey_meth = {
ddb634fe JL	348	EVP_PKEY_SM2,
	349	0,
	350	pkey_sm2_init,
	351	pkey_sm2_copy,
	352	pkey_sm2_cleanup,
	353
	354	0,
0943d5dd	355	pkey_sm2_paramgen,
ddb634fe JL	356
ddb634fe JL	357	0,
0943d5dd	358	pkey_sm2_keygen,
ddb634fe JL	359
	360	0,
	361	pkey_sm2_sign,
	362
	363	0,
	364	pkey_sm2_verify,
	365
	366	0, 0,
	367
	368	0, 0, 0, 0,
	369
	370	0,
	371	pkey_sm2_encrypt,
	372
	373	0,
	374	pkey_sm2_decrypt,
	375
	376	0,
	377	0,
	378	pkey_sm2_ctrl,
00433bad PY	379	pkey_sm2_ctrl_str,
	380
	381	0, 0,
	382
	383	0, 0, 0,
	384
	385	pkey_sm2_digest_custom
ddb634fe	386	};
19bd1fa1 PS	387
	388	const EVP_PKEY_METHOD *sm2_pkey_method(void)
	389	{
	390	return &sm2_pkey_meth;
	391	}