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openssl/crypto/dh/dh_lib.c

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/*
* Copyright 1995-2020 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
*/
/*
* DH low level APIs are deprecated for public use, but still ok for
* internal use.
*/
#include "internal/deprecated.h"
#include <stdio.h>
#include <openssl/bn.h>
#include <openssl/engine.h>
#include <openssl/obj_mac.h>
#include <openssl/core_names.h>
#include "internal/cryptlib.h"
#include "internal/refcount.h"
#include "crypto/evp.h"
#include "crypto/dh.h"
#include "dh_local.h"
static DH *dh_new_intern(ENGINE *engine, OPENSSL_CTX *libctx);
#ifndef FIPS_MODULE
int DH_set_method(DH *dh, const DH_METHOD *meth)
{
/*
* NB: The caller is specifically setting a method, so it's not up to us
* to deal with which ENGINE it comes from.
*/
const DH_METHOD *mtmp;
mtmp = dh->meth;
if (mtmp->finish)
mtmp->finish(dh);
#ifndef OPENSSL_NO_ENGINE
ENGINE_finish(dh->engine);
dh->engine = NULL;
#endif
dh->meth = meth;
if (meth->init)
meth->init(dh);
return 1;
}
const DH_METHOD *dh_get_method(const DH *dh)
{
return dh->meth;
}
DH *DH_new(void)
{
return dh_new_intern(NULL, NULL);
}
DH *DH_new_method(ENGINE *engine)
{
return dh_new_intern(engine, NULL);
}
#endif /* !FIPS_MODULE */
DH *dh_new_with_libctx(OPENSSL_CTX *libctx)
{
return dh_new_intern(NULL, libctx);
}
static DH *dh_new_intern(ENGINE *engine, OPENSSL_CTX *libctx)
{
DH *ret = OPENSSL_zalloc(sizeof(*ret));
if (ret == NULL) {
DHerr(0, ERR_R_MALLOC_FAILURE);
return NULL;
}
ret->references = 1;
ret->lock = CRYPTO_THREAD_lock_new();
if (ret->lock == NULL) {
DHerr(0, ERR_R_MALLOC_FAILURE);
OPENSSL_free(ret);
return NULL;
}
ret->libctx = libctx;
ret->meth = DH_get_default_method();
#if !defined(FIPS_MODULE) && !defined(OPENSSL_NO_ENGINE)
ret->flags = ret->meth->flags; /* early default init */
if (engine) {
if (!ENGINE_init(engine)) {
DHerr(0, ERR_R_ENGINE_LIB);
goto err;
}
ret->engine = engine;
} else
ret->engine = ENGINE_get_default_DH();
if (ret->engine) {
ret->meth = ENGINE_get_DH(ret->engine);
if (ret->meth == NULL) {
DHerr(0, ERR_R_ENGINE_LIB);
goto err;
}
}
#endif
ret->flags = ret->meth->flags;
#ifndef FIPS_MODULE
if (!CRYPTO_new_ex_data(CRYPTO_EX_INDEX_DH, ret, &ret->ex_data))
goto err;
#endif /* FIPS_MODULE */
if ((ret->meth->init != NULL) && !ret->meth->init(ret)) {
DHerr(0, ERR_R_INIT_FAIL);
goto err;
}
return ret;
err:
DH_free(ret);
return NULL;
}
void DH_free(DH *r)
{
int i;
if (r == NULL)
return;
CRYPTO_DOWN_REF(&r->references, &i, r->lock);
REF_PRINT_COUNT("DH", r);
if (i > 0)
return;
REF_ASSERT_ISNT(i < 0);
if (r->meth != NULL && r->meth->finish != NULL)
r->meth->finish(r);
#if !defined(FIPS_MODULE)
# if !defined(OPENSSL_NO_ENGINE)
ENGINE_finish(r->engine);
# endif
CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DH, r, &r->ex_data);
#endif
CRYPTO_THREAD_lock_free(r->lock);
ffc_params_cleanup(&r->params);
BN_clear_free(r->pub_key);
BN_clear_free(r->priv_key);
OPENSSL_free(r);
}
int DH_up_ref(DH *r)
{
int i;
if (CRYPTO_UP_REF(&r->references, &i, r->lock) <= 0)
return 0;
REF_PRINT_COUNT("DH", r);
REF_ASSERT_ISNT(i < 2);
return ((i > 1) ? 1 : 0);
}
#ifndef FIPS_MODULE
int DH_set_ex_data(DH *d, int idx, void *arg)
{
return CRYPTO_set_ex_data(&d->ex_data, idx, arg);
}
void *DH_get_ex_data(const DH *d, int idx)
{
return CRYPTO_get_ex_data(&d->ex_data, idx);
}
#endif
int DH_bits(const DH *dh)
{
return BN_num_bits(dh->params.p);
}
int DH_size(const DH *dh)
{
return BN_num_bytes(dh->params.p);
}
int DH_security_bits(const DH *dh)
{
int N;
if (dh->params.q != NULL)
N = BN_num_bits(dh->params.q);
else if (dh->length)
N = dh->length;
else
N = -1;
return BN_security_bits(BN_num_bits(dh->params.p), N);
}
void DH_get0_pqg(const DH *dh,
const BIGNUM **p, const BIGNUM **q, const BIGNUM **g)
{
ffc_params_get0_pqg(&dh->params, p, q, g);
}
int DH_set0_pqg(DH *dh, BIGNUM *p, BIGNUM *q, BIGNUM *g)
{
/*
* If the fields p and g in d are NULL, the corresponding input
* parameters MUST be non-NULL. q may remain NULL.
*/
if ((dh->params.p == NULL && p == NULL)
|| (dh->params.g == NULL && g == NULL))
return 0;
ffc_params_set0_pqg(&dh->params, p, q, g);
dh_cache_named_group(dh);
if (q != NULL)
dh->length = BN_num_bits(q);
/*
* Check if this is a named group. If it finds a named group then the
* 'q' and 'length' value are either already set or are set by the
* call.
*/
if (DH_get_nid(dh) == NID_undef) {
/* If its not a named group then set the 'length' if q is not NULL */
if (q != NULL)
dh->length = BN_num_bits(q);
}
dh->dirty_cnt++;
return 1;
}
long DH_get_length(const DH *dh)
{
return dh->length;
}
int DH_set_length(DH *dh, long length)
{
dh->length = length;
return 1;
}
void DH_get0_key(const DH *dh, const BIGNUM **pub_key, const BIGNUM **priv_key)
{
if (pub_key != NULL)
*pub_key = dh->pub_key;
if (priv_key != NULL)
*priv_key = dh->priv_key;
}
int DH_set0_key(DH *dh, BIGNUM *pub_key, BIGNUM *priv_key)
{
if (pub_key != NULL) {
BN_clear_free(dh->pub_key);
dh->pub_key = pub_key;
}
if (priv_key != NULL) {
BN_clear_free(dh->priv_key);
dh->priv_key = priv_key;
dh->length = BN_num_bits(priv_key);
}
dh->dirty_cnt++;
return 1;
}
const BIGNUM *DH_get0_p(const DH *dh)
{
return dh->params.p;
}
const BIGNUM *DH_get0_q(const DH *dh)
{
return dh->params.q;
}
const BIGNUM *DH_get0_g(const DH *dh)
{
return dh->params.g;
}
const BIGNUM *DH_get0_priv_key(const DH *dh)
{
return dh->priv_key;
}
const BIGNUM *DH_get0_pub_key(const DH *dh)
{
return dh->pub_key;
}
void DH_clear_flags(DH *dh, int flags)
{
dh->flags &= ~flags;
}
int DH_test_flags(const DH *dh, int flags)
{
return dh->flags & flags;
}
void DH_set_flags(DH *dh, int flags)
{
dh->flags |= flags;
}
#ifndef FIPS_MODULE
ENGINE *DH_get0_engine(DH *dh)
{
return dh->engine;
}
#endif /*FIPS_MODULE */
FFC_PARAMS *dh_get0_params(DH *dh)
{
return &dh->params;
}
int dh_get0_nid(const DH *dh)
{
return dh->params.nid;
}
int dh_ffc_params_fromdata(DH *dh, const OSSL_PARAM params[])
{
int ret;
FFC_PARAMS *ffc;
if (dh == NULL)
return 0;
ffc = dh_get0_params(dh);
if (ffc == NULL)
return 0;
ret = ffc_params_fromdata(ffc, params);
if (ret) {
dh_cache_named_group(dh);
dh->dirty_cnt++;
}
return ret;
}
static int dh_paramgen_check(EVP_PKEY_CTX *ctx)
{
if (ctx == NULL || !EVP_PKEY_CTX_IS_GEN_OP(ctx)) {
ERR_raise(ERR_LIB_EVP, EVP_R_COMMAND_NOT_SUPPORTED);
/* Uses the same return values as EVP_PKEY_CTX_ctrl */
return -2;
}
/* If key type not DH return error */
if (ctx->pmeth != NULL
&& ctx->pmeth->pkey_id != EVP_PKEY_DH
&& ctx->pmeth->pkey_id != EVP_PKEY_DHX)
return -1;
return 1;
}
int EVP_PKEY_CTX_set_dh_paramgen_gindex(EVP_PKEY_CTX *ctx, int gindex)
{
int ret;
OSSL_PARAM params[2], *p = params;
if ((ret = dh_paramgen_check(ctx)) <= 0)
return ret;
*p++ = OSSL_PARAM_construct_int(OSSL_PKEY_PARAM_FFC_GINDEX, &gindex);
*p++ = OSSL_PARAM_construct_end();
return EVP_PKEY_CTX_set_params(ctx, params);
}
int EVP_PKEY_CTX_set_dh_paramgen_seed(EVP_PKEY_CTX *ctx,
const unsigned char *seed,
size_t seedlen)
{
int ret;
OSSL_PARAM params[2], *p = params;
if ((ret = dh_paramgen_check(ctx)) <= 0)
return ret;
*p++ = OSSL_PARAM_construct_octet_string(OSSL_PKEY_PARAM_FFC_SEED,
(void *)seed, seedlen);
*p++ = OSSL_PARAM_construct_end();
return EVP_PKEY_CTX_set_params(ctx, params);
}
int EVP_PKEY_CTX_set_dh_paramgen_type(EVP_PKEY_CTX *ctx, int typ)
{
int ret;
OSSL_PARAM params[2], *p = params;
const char *name;
if ((ret = dh_paramgen_check(ctx)) <= 0)
return ret;
#if !defined(FIPS_MODULE)
/* TODO(3.0): Remove this eventually when no more legacy */
if (ctx->op.keymgmt.genctx == NULL)
return EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DH, EVP_PKEY_OP_PARAMGEN,
EVP_PKEY_CTRL_DH_PARAMGEN_TYPE, typ, NULL);
#endif
name = dh_gen_type_id2name(typ);
if (name == NULL)
return 0;
*p++ = OSSL_PARAM_construct_utf8_string(OSSL_PKEY_PARAM_FFC_TYPE,
(char *) name, 0);
*p++ = OSSL_PARAM_construct_end();
return EVP_PKEY_CTX_set_params(ctx, params);
}
int EVP_PKEY_CTX_set_dh_paramgen_prime_len(EVP_PKEY_CTX *ctx, int pbits)
{
int ret;
OSSL_PARAM params[2], *p = params;
size_t bits = pbits;
if ((ret = dh_paramgen_check(ctx)) <= 0)
return ret;
#if !defined(FIPS_MODULE)
/* TODO(3.0): Remove this eventually when no more legacy */
if (ctx->op.keymgmt.genctx == NULL)
return EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DH, EVP_PKEY_OP_PARAMGEN,
EVP_PKEY_CTRL_DH_PARAMGEN_PRIME_LEN, pbits,
NULL);
#endif
*p++ = OSSL_PARAM_construct_size_t(OSSL_PKEY_PARAM_FFC_PBITS, &bits);
*p++ = OSSL_PARAM_construct_end();
return EVP_PKEY_CTX_set_params(ctx, params);
}
int EVP_PKEY_CTX_set_dh_paramgen_subprime_len(EVP_PKEY_CTX *ctx, int qbits)
{
int ret;
OSSL_PARAM params[2], *p = params;
size_t bits2 = qbits;
if ((ret = dh_paramgen_check(ctx)) <= 0)
return ret;
#if !defined(FIPS_MODULE)
/* TODO(3.0): Remove this eventually when no more legacy */
if (ctx->op.keymgmt.genctx == NULL)
return EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DH, EVP_PKEY_OP_PARAMGEN,
EVP_PKEY_CTRL_DH_PARAMGEN_SUBPRIME_LEN, qbits,
NULL);
#endif
*p++ = OSSL_PARAM_construct_size_t(OSSL_PKEY_PARAM_FFC_QBITS, &bits2);
*p++ = OSSL_PARAM_construct_end();
return EVP_PKEY_CTX_set_params(ctx, params);
}
int EVP_PKEY_CTX_set_dh_paramgen_generator(EVP_PKEY_CTX *ctx, int gen)
{
int ret;
OSSL_PARAM params[2], *p = params;
if ((ret = dh_paramgen_check(ctx)) <= 0)
return ret;
#if !defined(FIPS_MODULE)
/* TODO(3.0): Remove this eventually when no more legacy */
if (ctx->op.keymgmt.genctx == NULL)
return EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DH, EVP_PKEY_OP_PARAMGEN,
EVP_PKEY_CTRL_DH_PARAMGEN_GENERATOR, gen, NULL);
#endif
*p++ = OSSL_PARAM_construct_int(OSSL_PKEY_PARAM_DH_GENERATOR, &gen);
*p++ = OSSL_PARAM_construct_end();
return EVP_PKEY_CTX_set_params(ctx, params);
}
int EVP_PKEY_CTX_set_dh_rfc5114(EVP_PKEY_CTX *ctx, int gen)
{
int ret;
OSSL_PARAM params[2], *p = params;
const char *name;
if ((ret = dh_paramgen_check(ctx)) <= 0)
return ret;
#if !defined(FIPS_MODULE)
/* TODO(3.0): Remove this eventually when no more legacy */
if (ctx->op.keymgmt.genctx == NULL)
return EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, EVP_PKEY_OP_PARAMGEN,
EVP_PKEY_CTRL_DH_RFC5114, gen, NULL);
#endif
name = ffc_named_group_from_uid(gen);
if (name == NULL)
return 0;
*p++ = OSSL_PARAM_construct_utf8_string(OSSL_PKEY_PARAM_DH_GROUP,
(void *)name, 0);
*p++ = OSSL_PARAM_construct_end();
return EVP_PKEY_CTX_set_params(ctx, params);
}
int EVP_PKEY_CTX_set_dhx_rfc5114(EVP_PKEY_CTX *ctx, int gen)
{
return EVP_PKEY_CTX_set_dh_rfc5114(ctx, gen);
}
int EVP_PKEY_CTX_set_dh_nid(EVP_PKEY_CTX *ctx, int nid)
{
int ret;
OSSL_PARAM params[2], *p = params;
const char *name;
if ((ret = dh_paramgen_check(ctx)) <= 0)
return ret;
#if !defined(FIPS_MODULE)
/* TODO(3.0): Remove this eventually when no more legacy */
if (ctx->op.keymgmt.genctx == NULL)
return EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DH,
EVP_PKEY_OP_PARAMGEN | EVP_PKEY_OP_KEYGEN,
EVP_PKEY_CTRL_DH_NID, nid, NULL);
#endif
name = ffc_named_group_from_uid(nid);
if (name == NULL)
return 0;
*p++ = OSSL_PARAM_construct_utf8_string(OSSL_PKEY_PARAM_DH_GROUP,
(void *)name, 0);
*p++ = OSSL_PARAM_construct_end();
return EVP_PKEY_CTX_set_params(ctx, params);
}
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