crypto/sm2/sm2_pmeth.c - third_party/openssl - Git at Google

 /*
  * 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"

 /* 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_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(ec, md, 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;
     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;
 }
	/*
	* 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"

	/* 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_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(ec, md, 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;
	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;
	}