/*
- * Copyright 2020 The OpenSSL Project Authors. All Rights Reserved.
+ * Copyright 2020-2023 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
* 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 <openssl/err.h>
#include <openssl/core_names.h>
+#ifndef FIPS_MODULE
+# include <openssl/x509.h>
+#endif
+#include "internal/param_build_set.h"
#include "crypto/dh.h"
+#include "dh_local.h"
/*
* The intention with the "backend" source file is to offer backend functions
* implementations alike.
*/
-int dh_key_fromdata(DH *dh, const OSSL_PARAM params[])
+static int dh_ffc_params_fromdata(DH *dh, const OSSL_PARAM params[])
+{
+ int ret;
+ FFC_PARAMS *ffc = ossl_dh_get0_params(dh);
+
+ ret = ossl_ffc_params_fromdata(ffc, params);
+ if (ret)
+ ossl_dh_cache_named_group(dh); /* This increments dh->dirty_cnt */
+ return ret;
+}
+
+int ossl_dh_params_fromdata(DH *dh, const OSSL_PARAM params[])
+{
+ const OSSL_PARAM *param_priv_len;
+ long priv_len;
+
+ if (!dh_ffc_params_fromdata(dh, params))
+ return 0;
+
+ param_priv_len =
+ OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_DH_PRIV_LEN);
+ if (param_priv_len != NULL
+ && (!OSSL_PARAM_get_long(param_priv_len, &priv_len)
+ || !DH_set_length(dh, priv_len)))
+ return 0;
+
+ return 1;
+}
+
+int ossl_dh_key_fromdata(DH *dh, const OSSL_PARAM params[], int include_private)
{
const OSSL_PARAM *param_priv_key, *param_pub_key;
BIGNUM *priv_key = NULL, *pub_key = NULL;
if (dh == NULL)
return 0;
- param_priv_key =
- OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_PRIV_KEY);
- param_pub_key =
- OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_PUB_KEY);
+ param_priv_key = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_PRIV_KEY);
+ param_pub_key = OSSL_PARAM_locate_const(params, OSSL_PKEY_PARAM_PUB_KEY);
- /*
- * DH documentation says that a public key must be present if a
- * private key is present.
- * We want to have at least a public key either way, so we end up
- * requiring it unconditionally.
- */
- if (param_priv_key != NULL && param_pub_key == NULL)
- return 0;
+ if (include_private
+ && param_priv_key != NULL
+ && !OSSL_PARAM_get_BN(param_priv_key, &priv_key))
+ goto err;
- if ((param_priv_key != NULL
- && !OSSL_PARAM_get_BN(param_priv_key, &priv_key))
- || (param_pub_key != NULL
- && !OSSL_PARAM_get_BN(param_pub_key, &pub_key)))
+ if (param_pub_key != NULL
+ && !OSSL_PARAM_get_BN(param_pub_key, &pub_key))
goto err;
if (!DH_set0_key(dh, pub_key, priv_key))
BN_free(pub_key);
return 0;
}
+
+int ossl_dh_params_todata(DH *dh, OSSL_PARAM_BLD *bld, OSSL_PARAM params[])
+{
+ long l = DH_get_length(dh);
+
+ if (!ossl_ffc_params_todata(ossl_dh_get0_params(dh), bld, params))
+ return 0;
+ if (l > 0
+ && !ossl_param_build_set_long(bld, params, OSSL_PKEY_PARAM_DH_PRIV_LEN, l))
+ return 0;
+ return 1;
+}
+
+int ossl_dh_key_todata(DH *dh, OSSL_PARAM_BLD *bld, OSSL_PARAM params[],
+ int include_private)
+{
+ const BIGNUM *priv = NULL, *pub = NULL;
+
+ if (dh == NULL)
+ return 0;
+
+ DH_get0_key(dh, &pub, &priv);
+ if (priv != NULL
+ && include_private
+ && !ossl_param_build_set_bn(bld, params, OSSL_PKEY_PARAM_PRIV_KEY, priv))
+ return 0;
+ if (pub != NULL
+ && !ossl_param_build_set_bn(bld, params, OSSL_PKEY_PARAM_PUB_KEY, pub))
+ return 0;
+
+ return 1;
+}
+
+int ossl_dh_is_foreign(const DH *dh)
+{
+#ifndef FIPS_MODULE
+ if (dh->engine != NULL || ossl_dh_get_method(dh) != DH_OpenSSL())
+ return 1;
+#endif
+ return 0;
+}
+
+static ossl_inline int dh_bn_dup_check(BIGNUM **out, const BIGNUM *f)
+{
+ if (f != NULL && (*out = BN_dup(f)) == NULL)
+ return 0;
+ return 1;
+}
+
+DH *ossl_dh_dup(const DH *dh, int selection)
+{
+ DH *dupkey = NULL;
+
+ /* Do not try to duplicate foreign DH keys */
+ if (ossl_dh_is_foreign(dh))
+ return NULL;
+
+ if ((dupkey = ossl_dh_new_ex(dh->libctx)) == NULL)
+ return NULL;
+
+ dupkey->length = DH_get_length(dh);
+ if ((selection & OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS) != 0
+ && !ossl_ffc_params_copy(&dupkey->params, &dh->params))
+ goto err;
+
+ dupkey->flags = dh->flags;
+
+ if ((selection & OSSL_KEYMGMT_SELECT_PUBLIC_KEY) != 0
+ && ((selection & OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS) == 0
+ || !dh_bn_dup_check(&dupkey->pub_key, dh->pub_key)))
+ goto err;
+
+ if ((selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY) != 0
+ && ((selection & OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS) == 0
+ || !dh_bn_dup_check(&dupkey->priv_key, dh->priv_key)))
+ goto err;
+
+#ifndef FIPS_MODULE
+ if (!CRYPTO_dup_ex_data(CRYPTO_EX_INDEX_DH,
+ &dupkey->ex_data, &dh->ex_data))
+ goto err;
+#endif
+
+ return dupkey;
+
+ err:
+ DH_free(dupkey);
+ return NULL;
+}
+
+#ifndef FIPS_MODULE
+DH *ossl_dh_key_from_pkcs8(const PKCS8_PRIV_KEY_INFO *p8inf,
+ OSSL_LIB_CTX *libctx, const char *propq)
+{
+ const unsigned char *p, *pm;
+ int pklen, pmlen;
+ int ptype;
+ const void *pval;
+ const ASN1_STRING *pstr;
+ const X509_ALGOR *palg;
+ BIGNUM *privkey_bn = NULL;
+ ASN1_INTEGER *privkey = NULL;
+ DH *dh = NULL;
+
+ if (!PKCS8_pkey_get0(NULL, &p, &pklen, &palg, p8inf))
+ return 0;
+
+ X509_ALGOR_get0(NULL, &ptype, &pval, palg);
+
+ if (ptype != V_ASN1_SEQUENCE)
+ goto decerr;
+ if ((privkey = d2i_ASN1_INTEGER(NULL, &p, pklen)) == NULL)
+ goto decerr;
+
+ pstr = pval;
+ pm = pstr->data;
+ pmlen = pstr->length;
+ switch (OBJ_obj2nid(palg->algorithm)) {
+ case NID_dhKeyAgreement:
+ dh = d2i_DHparams(NULL, &pm, pmlen);
+ break;
+ case NID_dhpublicnumber:
+ dh = d2i_DHxparams(NULL, &pm, pmlen);
+ break;
+ default:
+ goto decerr;
+ }
+ if (dh == NULL)
+ goto decerr;
+
+ /* We have parameters now set private key */
+ if ((privkey_bn = BN_secure_new()) == NULL
+ || !ASN1_INTEGER_to_BN(privkey, privkey_bn)) {
+ ERR_raise(ERR_LIB_DH, DH_R_BN_ERROR);
+ BN_clear_free(privkey_bn);
+ goto dherr;
+ }
+ if (!DH_set0_key(dh, NULL, privkey_bn))
+ goto dherr;
+ /* Calculate public key, increments dirty_cnt */
+ if (!DH_generate_key(dh))
+ goto dherr;
+
+ goto done;
+
+ decerr:
+ ERR_raise(ERR_LIB_DH, EVP_R_DECODE_ERROR);
+ dherr:
+ DH_free(dh);
+ dh = NULL;
+ done:
+ ASN1_STRING_clear_free(privkey);
+ return dh;
+}
+#endif
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