crypto/dh/dh_ameth.c - third_party/openssl - Git at Google

 /*
  * Copyright 2006-2022 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
  */

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

 #include <stdio.h>
 #include <openssl/x509.h>
 #include <openssl/asn1.h>
 #include <openssl/bn.h>
 #include <openssl/core_names.h>
 #include <openssl/param_build.h>
 #include "internal/ffc.h"
 #include "internal/cryptlib.h"
 #include "crypto/asn1.h"
 #include "crypto/dh.h"
 #include "crypto/evp.h"
 #include "dh_local.h"

 /*
  * i2d/d2i like DH parameter functions which use the appropriate routine for
  * PKCS#3 DH or X9.42 DH.
  */

 static DH *d2i_dhp(const EVP_PKEY *pkey, const unsigned char **pp,
                    long length)
 {
     DH *dh = NULL;
     int is_dhx = (pkey->ameth == &ossl_dhx_asn1_meth);

     if (is_dhx)
         dh = d2i_DHxparams(NULL, pp, length);
     else
         dh = d2i_DHparams(NULL, pp, length);

     return dh;
 }

 static int i2d_dhp(const EVP_PKEY *pkey, const DH *a, unsigned char **pp)
 {
     if (pkey->ameth == &ossl_dhx_asn1_meth)
         return i2d_DHxparams(a, pp);
     return i2d_DHparams(a, pp);
 }

 static void int_dh_free(EVP_PKEY *pkey)
 {
     DH_free(pkey->pkey.dh);
 }

 static int dh_pub_decode(EVP_PKEY *pkey, const X509_PUBKEY *pubkey)
 {
     const unsigned char *p, *pm;
     int pklen, pmlen;
     int ptype;
     const void *pval;
     const ASN1_STRING *pstr;
     X509_ALGOR *palg;
     ASN1_INTEGER *public_key = NULL;

     DH *dh = NULL;

     if (!X509_PUBKEY_get0_param(NULL, &p, &pklen, &palg, pubkey))
         return 0;
     X509_ALGOR_get0(NULL, &ptype, &pval, palg);

     if (ptype != V_ASN1_SEQUENCE) {
         ERR_raise(ERR_LIB_DH, DH_R_PARAMETER_ENCODING_ERROR);
         goto err;
     }

     pstr = pval;
     pm = pstr->data;
     pmlen = pstr->length;

     if ((dh = d2i_dhp(pkey, &pm, pmlen)) == NULL) {
         ERR_raise(ERR_LIB_DH, DH_R_DECODE_ERROR);
         goto err;
     }

     if ((public_key = d2i_ASN1_INTEGER(NULL, &p, pklen)) == NULL) {
         ERR_raise(ERR_LIB_DH, DH_R_DECODE_ERROR);
         goto err;
     }

     /* We have parameters now set public key */
     if ((dh->pub_key = ASN1_INTEGER_to_BN(public_key, NULL)) == NULL) {
         ERR_raise(ERR_LIB_DH, DH_R_BN_DECODE_ERROR);
         goto err;
     }

     ASN1_INTEGER_free(public_key);
     EVP_PKEY_assign(pkey, pkey->ameth->pkey_id, dh);
     return 1;

  err:
     ASN1_INTEGER_free(public_key);
     DH_free(dh);
     return 0;
 }

 static int dh_pub_encode(X509_PUBKEY *pk, const EVP_PKEY *pkey)
 {
     DH *dh;
     int ptype;
     unsigned char *penc = NULL;
     int penclen;
     ASN1_STRING *str;
     ASN1_INTEGER *pub_key = NULL;

     dh = pkey->pkey.dh;

     str = ASN1_STRING_new();
     if (str == NULL) {
         ERR_raise(ERR_LIB_DH, ERR_R_MALLOC_FAILURE);
         goto err;
     }
     str->length = i2d_dhp(pkey, dh, &str->data);
     if (str->length <= 0) {
         ERR_raise(ERR_LIB_DH, ERR_R_MALLOC_FAILURE);
         goto err;
     }
     ptype = V_ASN1_SEQUENCE;

     pub_key = BN_to_ASN1_INTEGER(dh->pub_key, NULL);
     if (pub_key == NULL)
         goto err;

     penclen = i2d_ASN1_INTEGER(pub_key, &penc);

     ASN1_INTEGER_free(pub_key);

     if (penclen <= 0) {
         ERR_raise(ERR_LIB_DH, ERR_R_MALLOC_FAILURE);
         goto err;
     }

     if (X509_PUBKEY_set0_param(pk, OBJ_nid2obj(pkey->ameth->pkey_id),
                                ptype, str, penc, penclen))
         return 1;

  err:
     OPENSSL_free(penc);
     ASN1_STRING_free(str);

     return 0;
 }

 /*
  * PKCS#8 DH is defined in PKCS#11 of all places. It is similar to DH in that
  * the AlgorithmIdentifier contains the parameters, the private key is
  * explicitly included and the pubkey must be recalculated.
  */

 static int dh_priv_decode(EVP_PKEY *pkey, const PKCS8_PRIV_KEY_INFO *p8)
 {
     int ret = 0;
     DH *dh = ossl_dh_key_from_pkcs8(p8, NULL, NULL);

     if (dh != NULL) {
         ret = 1;
         EVP_PKEY_assign(pkey, pkey->ameth->pkey_id, dh);
     }

     return ret;
 }

 static int dh_priv_encode(PKCS8_PRIV_KEY_INFO *p8, const EVP_PKEY *pkey)
 {
     ASN1_STRING *params = NULL;
     ASN1_INTEGER *prkey = NULL;
     unsigned char *dp = NULL;
     int dplen;

     params = ASN1_STRING_new();

     if (params == NULL) {
         ERR_raise(ERR_LIB_DH, ERR_R_MALLOC_FAILURE);
         goto err;
     }

     params->length = i2d_dhp(pkey, pkey->pkey.dh, &params->data);
     if (params->length <= 0) {
         ERR_raise(ERR_LIB_DH, ERR_R_MALLOC_FAILURE);
         goto err;
     }
     params->type = V_ASN1_SEQUENCE;

     /* Get private key into integer */
     prkey = BN_to_ASN1_INTEGER(pkey->pkey.dh->priv_key, NULL);

     if (prkey == NULL) {
         ERR_raise(ERR_LIB_DH, DH_R_BN_ERROR);
         goto err;
     }

     dplen = i2d_ASN1_INTEGER(prkey, &dp);

     ASN1_STRING_clear_free(prkey);
     prkey = NULL;

     if (!PKCS8_pkey_set0(p8, OBJ_nid2obj(pkey->ameth->pkey_id), 0,
                          V_ASN1_SEQUENCE, params, dp, dplen))
         goto err;

     return 1;

  err:
     OPENSSL_free(dp);
     ASN1_STRING_free(params);
     ASN1_STRING_clear_free(prkey);
     return 0;
 }

 static int dh_param_decode(EVP_PKEY *pkey,
                            const unsigned char **pder, int derlen)
 {
     DH *dh;

     if ((dh = d2i_dhp(pkey, pder, derlen)) == NULL)
         return 0;
     dh->dirty_cnt++;
     EVP_PKEY_assign(pkey, pkey->ameth->pkey_id, dh);
     return 1;
 }

 static int dh_param_encode(const EVP_PKEY *pkey, unsigned char **pder)
 {
     return i2d_dhp(pkey, pkey->pkey.dh, pder);
 }

 static int do_dh_print(BIO *bp, const DH *x, int indent, int ptype)
 {
     int reason = ERR_R_BUF_LIB;
     const char *ktype = NULL;
     BIGNUM *priv_key, *pub_key;

     if (ptype == 2)
         priv_key = x->priv_key;
     else
         priv_key = NULL;

     if (ptype > 0)
         pub_key = x->pub_key;
     else
         pub_key = NULL;

     if (x->params.p == NULL || (ptype == 2 && priv_key == NULL)
             || (ptype > 0 && pub_key == NULL)) {
         reason = ERR_R_PASSED_NULL_PARAMETER;
         goto err;
     }

     if (ptype == 2)
         ktype = "DH Private-Key";
     else if (ptype == 1)
         ktype = "DH Public-Key";
     else
         ktype = "DH Parameters";

     if (!BIO_indent(bp, indent, 128)
             || BIO_printf(bp, "%s: (%d bit)\n", ktype, DH_bits(x)) <= 0)
         goto err;
     indent += 4;

     if (!ASN1_bn_print(bp, "private-key:", priv_key, NULL, indent))
         goto err;
     if (!ASN1_bn_print(bp, "public-key:", pub_key, NULL, indent))
         goto err;

     if (!ossl_ffc_params_print(bp, &x->params, indent))
         goto err;

     if (x->length != 0) {
         if (!BIO_indent(bp, indent, 128)
                 || BIO_printf(bp, "recommended-private-length: %d bits\n",
                               (int)x->length) <= 0)
             goto err;
     }

     return 1;

  err:
     ERR_raise(ERR_LIB_DH, reason);
     return 0;
 }

 static int int_dh_size(const EVP_PKEY *pkey)
 {
     return DH_size(pkey->pkey.dh);
 }

 static int dh_bits(const EVP_PKEY *pkey)
 {
     return DH_bits(pkey->pkey.dh);
 }

 static int dh_security_bits(const EVP_PKEY *pkey)
 {
     return DH_security_bits(pkey->pkey.dh);
 }

 static int dh_cmp_parameters(const EVP_PKEY *a, const EVP_PKEY *b)
 {
     return ossl_ffc_params_cmp(&a->pkey.dh->params, &b->pkey.dh->params,
                                a->ameth != &ossl_dhx_asn1_meth);
 }

 static int int_dh_param_copy(DH *to, const DH *from, int is_x942)
 {
     if (is_x942 == -1)
         is_x942 = (from->params.q != NULL);
     if (!ossl_ffc_params_copy(&to->params, &from->params))
         return 0;
     if (!is_x942)
         to->length = from->length;
     to->dirty_cnt++;
     return 1;
 }

 DH *DHparams_dup(const DH *dh)
 {
     DH *ret;
     ret = DH_new();
     if (ret == NULL)
         return NULL;
     if (!int_dh_param_copy(ret, dh, -1)) {
         DH_free(ret);
         return NULL;
     }
     return ret;
 }

 static int dh_copy_parameters(EVP_PKEY *to, const EVP_PKEY *from)
 {
     if (to->pkey.dh == NULL) {
         to->pkey.dh = DH_new();
         if (to->pkey.dh == NULL)
             return 0;
     }
     return int_dh_param_copy(to->pkey.dh, from->pkey.dh,
                              from->ameth == &ossl_dhx_asn1_meth);
 }

 static int dh_missing_parameters(const EVP_PKEY *a)
 {
     return a->pkey.dh == NULL
         || a->pkey.dh->params.p == NULL
         || a->pkey.dh->params.g == NULL;
 }

 static int dh_pub_cmp(const EVP_PKEY *a, const EVP_PKEY *b)
 {
     if (dh_cmp_parameters(a, b) == 0)
         return 0;
     if (BN_cmp(b->pkey.dh->pub_key, a->pkey.dh->pub_key) != 0)
         return 0;
     else
         return 1;
 }

 static int dh_param_print(BIO *bp, const EVP_PKEY *pkey, int indent,
                           ASN1_PCTX *ctx)
 {
     return do_dh_print(bp, pkey->pkey.dh, indent, 0);
 }

 static int dh_public_print(BIO *bp, const EVP_PKEY *pkey, int indent,
                            ASN1_PCTX *ctx)
 {
     return do_dh_print(bp, pkey->pkey.dh, indent, 1);
 }

 static int dh_private_print(BIO *bp, const EVP_PKEY *pkey, int indent,
                             ASN1_PCTX *ctx)
 {
     return do_dh_print(bp, pkey->pkey.dh, indent, 2);
 }

 int DHparams_print(BIO *bp, const DH *x)
 {
     return do_dh_print(bp, x, 4, 0);
 }

 static int dh_pkey_ctrl(EVP_PKEY *pkey, int op, long arg1, void *arg2)
 {
     switch (op) {
     case ASN1_PKEY_CTRL_SET1_TLS_ENCPT:
         /* We should only be here if we have a legacy key */
         if (!ossl_assert(evp_pkey_is_legacy(pkey)))
             return 0;
         return ossl_dh_buf2key(evp_pkey_get0_DH_int(pkey), arg2, arg1);
     case ASN1_PKEY_CTRL_GET1_TLS_ENCPT:
         return ossl_dh_key2buf(EVP_PKEY_get0_DH(pkey), arg2, 0, 1);
     default:
         return -2;
     }
 }

 static int dhx_pkey_ctrl(EVP_PKEY *pkey, int op, long arg1, void *arg2)
 {
     switch (op) {
     default:
         return -2;
     }

 }

 static int dh_pkey_public_check(const EVP_PKEY *pkey)
 {
     DH *dh = pkey->pkey.dh;

     if (dh->pub_key == NULL) {
         ERR_raise(ERR_LIB_DH, DH_R_MISSING_PUBKEY);
         return 0;
     }

     return DH_check_pub_key_ex(dh, dh->pub_key);
 }

 static int dh_pkey_param_check(const EVP_PKEY *pkey)
 {
     DH *dh = pkey->pkey.dh;

     return DH_check_ex(dh);
 }

 static size_t dh_pkey_dirty_cnt(const EVP_PKEY *pkey)
 {
     return pkey->pkey.dh->dirty_cnt;
 }

 static int dh_pkey_export_to(const EVP_PKEY *from, void *to_keydata,
                              OSSL_FUNC_keymgmt_import_fn *importer,
                              OSSL_LIB_CTX *libctx, const char *propq)
 {
     DH *dh = from->pkey.dh;
     OSSL_PARAM_BLD *tmpl;
     const BIGNUM *p = DH_get0_p(dh), *g = DH_get0_g(dh), *q = DH_get0_q(dh);
     long l = DH_get_length(dh);
     const BIGNUM *pub_key = DH_get0_pub_key(dh);
     const BIGNUM *priv_key = DH_get0_priv_key(dh);
     OSSL_PARAM *params = NULL;
     int selection = 0;
     int rv = 0;

     if (p == NULL || g == NULL)
         return 0;

     tmpl = OSSL_PARAM_BLD_new();
     if (tmpl == NULL)
         return 0;
     if (!OSSL_PARAM_BLD_push_BN(tmpl, OSSL_PKEY_PARAM_FFC_P, p)
         || !OSSL_PARAM_BLD_push_BN(tmpl, OSSL_PKEY_PARAM_FFC_G, g))
         goto err;
     if (q != NULL) {
         if (!OSSL_PARAM_BLD_push_BN(tmpl, OSSL_PKEY_PARAM_FFC_Q, q))
             goto err;
     }
     selection |= OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS;
     if (l > 0) {
         if (!OSSL_PARAM_BLD_push_long(tmpl, OSSL_PKEY_PARAM_DH_PRIV_LEN, l))
             goto err;
         selection |= OSSL_KEYMGMT_SELECT_OTHER_PARAMETERS;
     }
     if (pub_key != NULL) {
         if (!OSSL_PARAM_BLD_push_BN(tmpl, OSSL_PKEY_PARAM_PUB_KEY, pub_key))
             goto err;
         selection |= OSSL_KEYMGMT_SELECT_PUBLIC_KEY;
     }
     if (priv_key != NULL) {
         if (!OSSL_PARAM_BLD_push_BN(tmpl, OSSL_PKEY_PARAM_PRIV_KEY,
                                     priv_key))
             goto err;
         selection |= OSSL_KEYMGMT_SELECT_PRIVATE_KEY;
     }

     if ((params = OSSL_PARAM_BLD_to_param(tmpl)) == NULL)
         goto err;

     /* We export, the provider imports */
     rv = importer(to_keydata, selection, params);

     OSSL_PARAM_free(params);
 err:
     OSSL_PARAM_BLD_free(tmpl);
     return rv;
 }

 static int dh_pkey_import_from_type(const OSSL_PARAM params[], void *vpctx,
                                     int type)
 {
     EVP_PKEY_CTX *pctx = vpctx;
     EVP_PKEY *pkey = EVP_PKEY_CTX_get0_pkey(pctx);
     DH *dh = ossl_dh_new_ex(pctx->libctx);

     if (dh == NULL) {
         ERR_raise(ERR_LIB_DH, ERR_R_MALLOC_FAILURE);
         return 0;
     }
     DH_clear_flags(dh, DH_FLAG_TYPE_MASK);
     DH_set_flags(dh, type == EVP_PKEY_DH ? DH_FLAG_TYPE_DH : DH_FLAG_TYPE_DHX);

     if (!ossl_dh_params_fromdata(dh, params)
         || !ossl_dh_key_fromdata(dh, params, 1)
         || !EVP_PKEY_assign(pkey, type, dh)) {
         DH_free(dh);
         return 0;
     }
     return 1;
 }

 static int dh_pkey_import_from(const OSSL_PARAM params[], void *vpctx)
 {
     return dh_pkey_import_from_type(params, vpctx, EVP_PKEY_DH);
 }

 static int dhx_pkey_import_from(const OSSL_PARAM params[], void *vpctx)
 {
     return dh_pkey_import_from_type(params, vpctx, EVP_PKEY_DHX);
 }

 static int dh_pkey_copy(EVP_PKEY *to, EVP_PKEY *from)
 {
     DH *dh = from->pkey.dh;
     DH *dupkey = NULL;
     int ret;

     if (dh != NULL) {
         dupkey = ossl_dh_dup(dh, OSSL_KEYMGMT_SELECT_ALL);
         if (dupkey == NULL)
             return 0;
     }

     ret = EVP_PKEY_assign(to, from->type, dupkey);
     if (!ret)
         DH_free(dupkey);
     return ret;
 }

 const EVP_PKEY_ASN1_METHOD ossl_dh_asn1_meth = {
     EVP_PKEY_DH,
     EVP_PKEY_DH,
     0,

     "DH",
     "OpenSSL PKCS#3 DH method",

     dh_pub_decode,
     dh_pub_encode,
     dh_pub_cmp,
     dh_public_print,

     dh_priv_decode,
     dh_priv_encode,
     dh_private_print,

     int_dh_size,
     dh_bits,
     dh_security_bits,

     dh_param_decode,
     dh_param_encode,
     dh_missing_parameters,
     dh_copy_parameters,
     dh_cmp_parameters,
     dh_param_print,
     0,

     int_dh_free,
     dh_pkey_ctrl,

     0, 0, 0, 0, 0,

     0,
     dh_pkey_public_check,
     dh_pkey_param_check,

     0, 0, 0, 0,

     dh_pkey_dirty_cnt,
     dh_pkey_export_to,
     dh_pkey_import_from,
     dh_pkey_copy
 };

 const EVP_PKEY_ASN1_METHOD ossl_dhx_asn1_meth = {
     EVP_PKEY_DHX,
     EVP_PKEY_DHX,
     0,

     "X9.42 DH",
     "OpenSSL X9.42 DH method",

     dh_pub_decode,
     dh_pub_encode,
     dh_pub_cmp,
     dh_public_print,

     dh_priv_decode,
     dh_priv_encode,
     dh_private_print,

     int_dh_size,
     dh_bits,
     dh_security_bits,

     dh_param_decode,
     dh_param_encode,
     dh_missing_parameters,
     dh_copy_parameters,
     dh_cmp_parameters,
     dh_param_print,
     0,

     int_dh_free,
     dhx_pkey_ctrl,

     0, 0, 0, 0, 0,

     0,
     dh_pkey_public_check,
     dh_pkey_param_check,
     0, 0, 0, 0,
     dh_pkey_dirty_cnt,
     dh_pkey_export_to,
     dhx_pkey_import_from,
     dh_pkey_copy
 };
	/*
	* Copyright 2006-2022 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
	*/

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

	#include <stdio.h>
	#include <openssl/x509.h>
	#include <openssl/asn1.h>
	#include <openssl/bn.h>
	#include <openssl/core_names.h>
	#include <openssl/param_build.h>
	#include "internal/ffc.h"
	#include "internal/cryptlib.h"
	#include "crypto/asn1.h"
	#include "crypto/dh.h"
	#include "crypto/evp.h"
	#include "dh_local.h"

	/*
	* i2d/d2i like DH parameter functions which use the appropriate routine for
	* PKCS#3 DH or X9.42 DH.
	*/

	static DH d2i_dhp(const EVP_PKEY pkey, const unsigned char **pp,
	long length)
	{
	DH *dh = NULL;
	int is_dhx = (pkey->ameth == &ossl_dhx_asn1_meth);

	if (is_dhx)
	dh = d2i_DHxparams(NULL, pp, length);
	else
	dh = d2i_DHparams(NULL, pp, length);

	return dh;
	}

	static int i2d_dhp(const EVP_PKEY pkey, const DH a, unsigned char **pp)
	{
	if (pkey->ameth == &ossl_dhx_asn1_meth)
	return i2d_DHxparams(a, pp);
	return i2d_DHparams(a, pp);
	}

	static void int_dh_free(EVP_PKEY *pkey)
	{
	DH_free(pkey->pkey.dh);
	}

	static int dh_pub_decode(EVP_PKEY pkey, const X509_PUBKEY pubkey)
	{
	const unsigned char p, pm;
	int pklen, pmlen;
	int ptype;
	const void *pval;
	const ASN1_STRING *pstr;
	X509_ALGOR *palg;
	ASN1_INTEGER *public_key = NULL;

	DH *dh = NULL;

	if (!X509_PUBKEY_get0_param(NULL, &p, &pklen, &palg, pubkey))
	return 0;
	X509_ALGOR_get0(NULL, &ptype, &pval, palg);

	if (ptype != V_ASN1_SEQUENCE) {
	ERR_raise(ERR_LIB_DH, DH_R_PARAMETER_ENCODING_ERROR);
	goto err;
	}

	pstr = pval;
	pm = pstr->data;
	pmlen = pstr->length;

	if ((dh = d2i_dhp(pkey, &pm, pmlen)) == NULL) {
	ERR_raise(ERR_LIB_DH, DH_R_DECODE_ERROR);
	goto err;
	}

	if ((public_key = d2i_ASN1_INTEGER(NULL, &p, pklen)) == NULL) {
	ERR_raise(ERR_LIB_DH, DH_R_DECODE_ERROR);
	goto err;
	}

	/* We have parameters now set public key */
	if ((dh->pub_key = ASN1_INTEGER_to_BN(public_key, NULL)) == NULL) {
	ERR_raise(ERR_LIB_DH, DH_R_BN_DECODE_ERROR);
	goto err;
	}

	ASN1_INTEGER_free(public_key);
	EVP_PKEY_assign(pkey, pkey->ameth->pkey_id, dh);
	return 1;

	err:
	ASN1_INTEGER_free(public_key);
	DH_free(dh);
	return 0;
	}

	static int dh_pub_encode(X509_PUBKEY pk, const EVP_PKEY pkey)
	{
	DH *dh;
	int ptype;
	unsigned char *penc = NULL;
	int penclen;
	ASN1_STRING *str;
	ASN1_INTEGER *pub_key = NULL;

	dh = pkey->pkey.dh;

	str = ASN1_STRING_new();
	if (str == NULL) {
	ERR_raise(ERR_LIB_DH, ERR_R_MALLOC_FAILURE);
	goto err;
	}
	str->length = i2d_dhp(pkey, dh, &str->data);
	if (str->length <= 0) {
	ERR_raise(ERR_LIB_DH, ERR_R_MALLOC_FAILURE);
	goto err;
	}
	ptype = V_ASN1_SEQUENCE;

	pub_key = BN_to_ASN1_INTEGER(dh->pub_key, NULL);
	if (pub_key == NULL)
	goto err;

	penclen = i2d_ASN1_INTEGER(pub_key, &penc);

	ASN1_INTEGER_free(pub_key);

	if (penclen <= 0) {
	ERR_raise(ERR_LIB_DH, ERR_R_MALLOC_FAILURE);
	goto err;
	}

	if (X509_PUBKEY_set0_param(pk, OBJ_nid2obj(pkey->ameth->pkey_id),
	ptype, str, penc, penclen))
	return 1;

	err:
	OPENSSL_free(penc);
	ASN1_STRING_free(str);

	return 0;
	}

	/*
	* PKCS#8 DH is defined in PKCS#11 of all places. It is similar to DH in that
	* the AlgorithmIdentifier contains the parameters, the private key is
	* explicitly included and the pubkey must be recalculated.
	*/

	static int dh_priv_decode(EVP_PKEY pkey, const PKCS8_PRIV_KEY_INFO p8)
	{
	int ret = 0;
	DH *dh = ossl_dh_key_from_pkcs8(p8, NULL, NULL);

	if (dh != NULL) {
	ret = 1;
	EVP_PKEY_assign(pkey, pkey->ameth->pkey_id, dh);
	}

	return ret;
	}

	static int dh_priv_encode(PKCS8_PRIV_KEY_INFO p8, const EVP_PKEY pkey)
	{
	ASN1_STRING *params = NULL;
	ASN1_INTEGER *prkey = NULL;
	unsigned char *dp = NULL;
	int dplen;

	params = ASN1_STRING_new();

	if (params == NULL) {
	ERR_raise(ERR_LIB_DH, ERR_R_MALLOC_FAILURE);
	goto err;
	}

	params->length = i2d_dhp(pkey, pkey->pkey.dh, &params->data);
	if (params->length <= 0) {
	ERR_raise(ERR_LIB_DH, ERR_R_MALLOC_FAILURE);
	goto err;
	}
	params->type = V_ASN1_SEQUENCE;

	/* Get private key into integer */
	prkey = BN_to_ASN1_INTEGER(pkey->pkey.dh->priv_key, NULL);

	if (prkey == NULL) {
	ERR_raise(ERR_LIB_DH, DH_R_BN_ERROR);
	goto err;
	}

	dplen = i2d_ASN1_INTEGER(prkey, &dp);

	ASN1_STRING_clear_free(prkey);
	prkey = NULL;

	if (!PKCS8_pkey_set0(p8, OBJ_nid2obj(pkey->ameth->pkey_id), 0,
	V_ASN1_SEQUENCE, params, dp, dplen))
	goto err;

	return 1;

	err:
	OPENSSL_free(dp);
	ASN1_STRING_free(params);
	ASN1_STRING_clear_free(prkey);
	return 0;
	}

	static int dh_param_decode(EVP_PKEY *pkey,
	const unsigned char **pder, int derlen)
	{
	DH *dh;

	if ((dh = d2i_dhp(pkey, pder, derlen)) == NULL)
	return 0;
	dh->dirty_cnt++;
	EVP_PKEY_assign(pkey, pkey->ameth->pkey_id, dh);
	return 1;
	}

	static int dh_param_encode(const EVP_PKEY pkey, unsigned char *pder)
	{
	return i2d_dhp(pkey, pkey->pkey.dh, pder);
	}

	static int do_dh_print(BIO bp, const DH x, int indent, int ptype)
	{
	int reason = ERR_R_BUF_LIB;
	const char *ktype = NULL;
	BIGNUM priv_key, pub_key;

	if (ptype == 2)
	priv_key = x->priv_key;
	else
	priv_key = NULL;

	if (ptype > 0)
	pub_key = x->pub_key;
	else
	pub_key = NULL;

	if (x->params.p == NULL \|\| (ptype == 2 && priv_key == NULL)
	\|\| (ptype > 0 && pub_key == NULL)) {
	reason = ERR_R_PASSED_NULL_PARAMETER;
	goto err;
	}

	if (ptype == 2)
	ktype = "DH Private-Key";
	else if (ptype == 1)
	ktype = "DH Public-Key";
	else
	ktype = "DH Parameters";

	if (!BIO_indent(bp, indent, 128)
	\|\| BIO_printf(bp, "%s: (%d bit)\n", ktype, DH_bits(x)) <= 0)
	goto err;
	indent += 4;

	if (!ASN1_bn_print(bp, "private-key:", priv_key, NULL, indent))
	goto err;
	if (!ASN1_bn_print(bp, "public-key:", pub_key, NULL, indent))
	goto err;

	if (!ossl_ffc_params_print(bp, &x->params, indent))
	goto err;

	if (x->length != 0) {
	if (!BIO_indent(bp, indent, 128)
	\|\| BIO_printf(bp, "recommended-private-length: %d bits\n",
	(int)x->length) <= 0)
	goto err;
	}

	return 1;

	err:
	ERR_raise(ERR_LIB_DH, reason);
	return 0;
	}

	static int int_dh_size(const EVP_PKEY *pkey)
	{
	return DH_size(pkey->pkey.dh);
	}

	static int dh_bits(const EVP_PKEY *pkey)
	{
	return DH_bits(pkey->pkey.dh);
	}

	static int dh_security_bits(const EVP_PKEY *pkey)
	{
	return DH_security_bits(pkey->pkey.dh);
	}

	static int dh_cmp_parameters(const EVP_PKEY a, const EVP_PKEY b)
	{
	return ossl_ffc_params_cmp(&a->pkey.dh->params, &b->pkey.dh->params,
	a->ameth != &ossl_dhx_asn1_meth);
	}

	static int int_dh_param_copy(DH to, const DH from, int is_x942)
	{
	if (is_x942 == -1)
	is_x942 = (from->params.q != NULL);
	if (!ossl_ffc_params_copy(&to->params, &from->params))
	return 0;
	if (!is_x942)
	to->length = from->length;
	to->dirty_cnt++;
	return 1;
	}

	DH DHparams_dup(const DH dh)
	{
	DH *ret;
	ret = DH_new();
	if (ret == NULL)
	return NULL;
	if (!int_dh_param_copy(ret, dh, -1)) {
	DH_free(ret);
	return NULL;
	}
	return ret;
	}

	static int dh_copy_parameters(EVP_PKEY to, const EVP_PKEY from)
	{
	if (to->pkey.dh == NULL) {
	to->pkey.dh = DH_new();
	if (to->pkey.dh == NULL)
	return 0;
	}
	return int_dh_param_copy(to->pkey.dh, from->pkey.dh,
	from->ameth == &ossl_dhx_asn1_meth);
	}

	static int dh_missing_parameters(const EVP_PKEY *a)
	{
	return a->pkey.dh == NULL
	\|\| a->pkey.dh->params.p == NULL
	\|\| a->pkey.dh->params.g == NULL;
	}

	static int dh_pub_cmp(const EVP_PKEY a, const EVP_PKEY b)
	{
	if (dh_cmp_parameters(a, b) == 0)
	return 0;
	if (BN_cmp(b->pkey.dh->pub_key, a->pkey.dh->pub_key) != 0)
	return 0;
	else
	return 1;
	}

	static int dh_param_print(BIO bp, const EVP_PKEY pkey, int indent,
	ASN1_PCTX *ctx)
	{
	return do_dh_print(bp, pkey->pkey.dh, indent, 0);
	}

	static int dh_public_print(BIO bp, const EVP_PKEY pkey, int indent,
	ASN1_PCTX *ctx)
	{
	return do_dh_print(bp, pkey->pkey.dh, indent, 1);
	}

	static int dh_private_print(BIO bp, const EVP_PKEY pkey, int indent,
	ASN1_PCTX *ctx)
	{
	return do_dh_print(bp, pkey->pkey.dh, indent, 2);
	}

	int DHparams_print(BIO bp, const DH x)
	{
	return do_dh_print(bp, x, 4, 0);
	}

	static int dh_pkey_ctrl(EVP_PKEY pkey, int op, long arg1, void arg2)
	{
	switch (op) {
	case ASN1_PKEY_CTRL_SET1_TLS_ENCPT:
	/* We should only be here if we have a legacy key */
	if (!ossl_assert(evp_pkey_is_legacy(pkey)))
	return 0;
	return ossl_dh_buf2key(evp_pkey_get0_DH_int(pkey), arg2, arg1);
	case ASN1_PKEY_CTRL_GET1_TLS_ENCPT:
	return ossl_dh_key2buf(EVP_PKEY_get0_DH(pkey), arg2, 0, 1);
	default:
	return -2;
	}
	}

	static int dhx_pkey_ctrl(EVP_PKEY pkey, int op, long arg1, void arg2)
	{
	switch (op) {
	default:
	return -2;
	}

	}

	static int dh_pkey_public_check(const EVP_PKEY *pkey)
	{
	DH *dh = pkey->pkey.dh;

	if (dh->pub_key == NULL) {
	ERR_raise(ERR_LIB_DH, DH_R_MISSING_PUBKEY);
	return 0;
	}

	return DH_check_pub_key_ex(dh, dh->pub_key);
	}

	static int dh_pkey_param_check(const EVP_PKEY *pkey)
	{
	DH *dh = pkey->pkey.dh;

	return DH_check_ex(dh);
	}

	static size_t dh_pkey_dirty_cnt(const EVP_PKEY *pkey)
	{
	return pkey->pkey.dh->dirty_cnt;
	}

	static int dh_pkey_export_to(const EVP_PKEY from, void to_keydata,
	OSSL_FUNC_keymgmt_import_fn *importer,
	OSSL_LIB_CTX libctx, const char propq)
	{
	DH *dh = from->pkey.dh;
	OSSL_PARAM_BLD *tmpl;
	const BIGNUM p = DH_get0_p(dh), g = DH_get0_g(dh), *q = DH_get0_q(dh);
	long l = DH_get_length(dh);
	const BIGNUM *pub_key = DH_get0_pub_key(dh);
	const BIGNUM *priv_key = DH_get0_priv_key(dh);
	OSSL_PARAM *params = NULL;
	int selection = 0;
	int rv = 0;

	if (p == NULL \|\| g == NULL)
	return 0;

	tmpl = OSSL_PARAM_BLD_new();
	if (tmpl == NULL)
	return 0;
	if (!OSSL_PARAM_BLD_push_BN(tmpl, OSSL_PKEY_PARAM_FFC_P, p)
	\|\| !OSSL_PARAM_BLD_push_BN(tmpl, OSSL_PKEY_PARAM_FFC_G, g))
	goto err;
	if (q != NULL) {
	if (!OSSL_PARAM_BLD_push_BN(tmpl, OSSL_PKEY_PARAM_FFC_Q, q))
	goto err;
	}
	selection \|= OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS;
	if (l > 0) {
	if (!OSSL_PARAM_BLD_push_long(tmpl, OSSL_PKEY_PARAM_DH_PRIV_LEN, l))
	goto err;
	selection \|= OSSL_KEYMGMT_SELECT_OTHER_PARAMETERS;
	}
	if (pub_key != NULL) {
	if (!OSSL_PARAM_BLD_push_BN(tmpl, OSSL_PKEY_PARAM_PUB_KEY, pub_key))
	goto err;
	selection \|= OSSL_KEYMGMT_SELECT_PUBLIC_KEY;
	}
	if (priv_key != NULL) {
	if (!OSSL_PARAM_BLD_push_BN(tmpl, OSSL_PKEY_PARAM_PRIV_KEY,
	priv_key))
	goto err;
	selection \|= OSSL_KEYMGMT_SELECT_PRIVATE_KEY;
	}

	if ((params = OSSL_PARAM_BLD_to_param(tmpl)) == NULL)
	goto err;

	/* We export, the provider imports */
	rv = importer(to_keydata, selection, params);

	OSSL_PARAM_free(params);
	err:
	OSSL_PARAM_BLD_free(tmpl);
	return rv;
	}

	static int dh_pkey_import_from_type(const OSSL_PARAM params[], void *vpctx,
	int type)
	{
	EVP_PKEY_CTX *pctx = vpctx;
	EVP_PKEY *pkey = EVP_PKEY_CTX_get0_pkey(pctx);
	DH *dh = ossl_dh_new_ex(pctx->libctx);

	if (dh == NULL) {
	ERR_raise(ERR_LIB_DH, ERR_R_MALLOC_FAILURE);
	return 0;
	}
	DH_clear_flags(dh, DH_FLAG_TYPE_MASK);
	DH_set_flags(dh, type == EVP_PKEY_DH ? DH_FLAG_TYPE_DH : DH_FLAG_TYPE_DHX);

	if (!ossl_dh_params_fromdata(dh, params)
	\|\| !ossl_dh_key_fromdata(dh, params, 1)
	\|\| !EVP_PKEY_assign(pkey, type, dh)) {
	DH_free(dh);
	return 0;
	}
	return 1;
	}

	static int dh_pkey_import_from(const OSSL_PARAM params[], void *vpctx)
	{
	return dh_pkey_import_from_type(params, vpctx, EVP_PKEY_DH);
	}

	static int dhx_pkey_import_from(const OSSL_PARAM params[], void *vpctx)
	{
	return dh_pkey_import_from_type(params, vpctx, EVP_PKEY_DHX);
	}

	static int dh_pkey_copy(EVP_PKEY to, EVP_PKEY from)
	{
	DH *dh = from->pkey.dh;
	DH *dupkey = NULL;
	int ret;

	if (dh != NULL) {
	dupkey = ossl_dh_dup(dh, OSSL_KEYMGMT_SELECT_ALL);
	if (dupkey == NULL)
	return 0;
	}

	ret = EVP_PKEY_assign(to, from->type, dupkey);
	if (!ret)
	DH_free(dupkey);
	return ret;
	}

	const EVP_PKEY_ASN1_METHOD ossl_dh_asn1_meth = {
	EVP_PKEY_DH,
	EVP_PKEY_DH,
	0,

	"DH",
	"OpenSSL PKCS#3 DH method",

	dh_pub_decode,
	dh_pub_encode,
	dh_pub_cmp,
	dh_public_print,

	dh_priv_decode,
	dh_priv_encode,
	dh_private_print,

	int_dh_size,
	dh_bits,
	dh_security_bits,

	dh_param_decode,
	dh_param_encode,
	dh_missing_parameters,
	dh_copy_parameters,
	dh_cmp_parameters,
	dh_param_print,
	0,

	int_dh_free,
	dh_pkey_ctrl,

	0, 0, 0, 0, 0,

	0,
	dh_pkey_public_check,
	dh_pkey_param_check,

	0, 0, 0, 0,

	dh_pkey_dirty_cnt,
	dh_pkey_export_to,
	dh_pkey_import_from,
	dh_pkey_copy
	};

	const EVP_PKEY_ASN1_METHOD ossl_dhx_asn1_meth = {
	EVP_PKEY_DHX,
	EVP_PKEY_DHX,
	0,

	"X9.42 DH",
	"OpenSSL X9.42 DH method",

	dh_pub_decode,
	dh_pub_encode,
	dh_pub_cmp,
	dh_public_print,

	dh_priv_decode,
	dh_priv_encode,
	dh_private_print,

	int_dh_size,
	dh_bits,
	dh_security_bits,

	dh_param_decode,
	dh_param_encode,
	dh_missing_parameters,
	dh_copy_parameters,
	dh_cmp_parameters,
	dh_param_print,
	0,

	int_dh_free,
	dhx_pkey_ctrl,

	0, 0, 0, 0, 0,

	0,
	dh_pkey_public_check,
	dh_pkey_param_check,
	0, 0, 0, 0,
	dh_pkey_dirty_cnt,
	dh_pkey_export_to,
	dhx_pkey_import_from,
	dh_pkey_copy
	};