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/*
* Copyright 2019-2020 The OpenSSL Project Authors. All Rights Reserved.
* Copyright (c) 2019, Oracle and/or its affiliates. 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
*/
#include "e_os.h"
#include <openssl/core_names.h>
#include <openssl/core_dispatch.h>
#include <openssl/err.h>
#include <openssl/evp.h>
#include <openssl/params.h>
#include "internal/packet.h"
#include "internal/der.h"
#include "prov/provider_ctx.h"
#include "prov/providercommon.h"
#include "prov/providercommonerr.h"
#include "prov/implementations.h"
#include "prov/provider_util.h"
#include "prov/der_wrap.h"
#define X942KDF_MAX_INLEN (1 << 30)
static OSSL_FUNC_kdf_newctx_fn x942kdf_new;
static OSSL_FUNC_kdf_freectx_fn x942kdf_free;
static OSSL_FUNC_kdf_reset_fn x942kdf_reset;
static OSSL_FUNC_kdf_derive_fn x942kdf_derive;
static OSSL_FUNC_kdf_settable_ctx_params_fn x942kdf_settable_ctx_params;
static OSSL_FUNC_kdf_set_ctx_params_fn x942kdf_set_ctx_params;
static OSSL_FUNC_kdf_gettable_ctx_params_fn x942kdf_gettable_ctx_params;
static OSSL_FUNC_kdf_get_ctx_params_fn x942kdf_get_ctx_params;
typedef struct {
void *provctx;
PROV_DIGEST digest;
unsigned char *secret;
size_t secret_len;
unsigned char *acvpinfo;
size_t acvpinfo_len;
unsigned char *partyuinfo, *partyvinfo, *supp_pubinfo, *supp_privinfo;
size_t partyuinfo_len, partyvinfo_len, supp_pubinfo_len, supp_privinfo_len;
size_t dkm_len;
const unsigned char *cek_oid;
size_t cek_oid_len;
int use_keybits;
} KDF_X942;
/*
* A table of allowed wrapping algorithms, oids and the associated output
* lengths.
* NOTE: RC2wrap and camellia128_wrap have been removed as there are no
* corresponding ciphers for these operations.
*/
static const struct {
const char *name;
const unsigned char *oid;
size_t oid_len;
size_t keklen; /* size in bytes */
} kek_algs[] = {
{ "AES-128-WRAP", ossl_der_oid_id_aes128_wrap, DER_OID_SZ_id_aes128_wrap,
16 },
{ "AES-192-WRAP", ossl_der_oid_id_aes192_wrap, DER_OID_SZ_id_aes192_wrap,
24 },
{ "AES-256-WRAP", ossl_der_oid_id_aes256_wrap, DER_OID_SZ_id_aes256_wrap,
32 },
#ifndef FIPS_MODULE
{ "DES3-WRAP", ossl_der_oid_id_alg_CMS3DESwrap,
DER_OID_SZ_id_alg_CMS3DESwrap, 24 },
#endif
};
static int find_alg_id(OSSL_LIB_CTX *libctx, const char *algname,
const char *propq, size_t *id)
{
int ret = 1;
size_t i;
EVP_CIPHER *cipher;
cipher = EVP_CIPHER_fetch(libctx, algname, propq);
if (cipher != NULL) {
for (i = 0; i < OSSL_NELEM(kek_algs); i++) {
if (EVP_CIPHER_is_a(cipher, kek_algs[i].name)) {
*id = i;
goto end;
}
}
}
ret = 0;
ERR_raise(ERR_LIB_PROV, PROV_R_UNSUPPORTED_CEK_ALG);
end:
EVP_CIPHER_free(cipher);
return ret;
}
static int DER_w_keyinfo(WPACKET *pkt,
const unsigned char *der_oid, size_t der_oidlen,
unsigned char **pcounter)
{
return ossl_DER_w_begin_sequence(pkt, -1)
/* Store the initial value of 1 into the counter */
&& ossl_DER_w_octet_string_uint32(pkt, -1, 1)
/* Remember where we stored the counter in the buffer */
&& (pcounter == NULL
|| (*pcounter = WPACKET_get_curr(pkt)) != NULL)
&& ossl_DER_w_precompiled(pkt, -1, der_oid, der_oidlen)
&& ossl_DER_w_end_sequence(pkt, -1);
}
static int der_encode_sharedinfo(WPACKET *pkt, unsigned char *buf, size_t buflen,
const unsigned char *der_oid, size_t der_oidlen,
const unsigned char *acvp, size_t acvplen,
const unsigned char *partyu, size_t partyulen,
const unsigned char *partyv, size_t partyvlen,
const unsigned char *supp_pub, size_t supp_publen,
const unsigned char *supp_priv, size_t supp_privlen,
uint32_t keylen_bits, unsigned char **pcounter)
{
return (buf != NULL ? WPACKET_init_der(pkt, buf, buflen) :
WPACKET_init_null_der(pkt))
&& ossl_DER_w_begin_sequence(pkt, -1)
&& (supp_priv == NULL
|| ossl_DER_w_octet_string(pkt, 3, supp_priv, supp_privlen))
&& (supp_pub == NULL
|| ossl_DER_w_octet_string(pkt, 2, supp_pub, supp_publen))
&& (keylen_bits == 0
|| ossl_DER_w_octet_string_uint32(pkt, 2, keylen_bits))
&& (partyv == NULL || ossl_DER_w_octet_string(pkt, 1, partyv, partyvlen))
&& (partyu == NULL || ossl_DER_w_octet_string(pkt, 0, partyu, partyulen))
&& (acvp == NULL || ossl_DER_w_precompiled(pkt, -1, acvp, acvplen))
&& DER_w_keyinfo(pkt, der_oid, der_oidlen, pcounter)
&& ossl_DER_w_end_sequence(pkt, -1)
&& WPACKET_finish(pkt);
}
/*
* Encode the other info structure.
*
* The ANS X9.42-2003 standard uses OtherInfo:
*
* OtherInfo ::= SEQUENCE {
* keyInfo KeySpecificInfo,
* partyUInfo [0] OCTET STRING OPTIONAL,
* partyVInfo [1] OCTET STRING OPTIONAL,
* suppPubInfo [2] OCTET STRING OPTIONAL,
* suppPrivInfo [3] OCTET STRING OPTIONAL
* }
*
* KeySpecificInfo ::= SEQUENCE {
* algorithm OBJECT IDENTIFIER,
* counter OCTET STRING SIZE (4..4)
* }
*
* RFC2631 Section 2.1.2 Contains the following definition for OtherInfo
*
* OtherInfo ::= SEQUENCE {
* keyInfo KeySpecificInfo,
* partyAInfo [0] OCTET STRING OPTIONAL,
* suppPubInfo [2] OCTET STRING
* }
* Where suppPubInfo is the key length (in bits) (stored into 4 bytes)
*
* |keylen| is the length (in bytes) of the generated KEK. It is stored into
* suppPubInfo (in bits). It is ignored if the value is 0.
* |cek_oid| The oid of the key wrapping algorithm.
* |cek_oidlen| The length (in bytes) of the key wrapping algorithm oid,
* |acvp| is the optional blob of DER data representing one or more of the
* OtherInfo fields related to |partyu|, |partyv|, |supp_pub| and |supp_priv|.
* This field should noramlly be NULL. If |acvp| is non NULL then |partyu|,
* |partyv|, |supp_pub| and |supp_priv| should all be NULL.
* |acvp_len| is the |acvp| length (in bytes).
* |partyu| is the optional public info contributed by the initiator.
* It can be NULL. (It is also used as the ukm by CMS).
* |partyu_len| is the |partyu| length (in bytes).
* |partyv| is the optional public info contributed by the responder.
* It can be NULL.
* |partyv_len| is the |partyv| length (in bytes).
* |supp_pub| is the optional additional, mutually-known public information.
* It can be NULL. |keylen| should be 0 if this is not NULL.
* |supp_pub_len| is the |supp_pub| length (in bytes).
* |supp_priv| is the optional additional, mutually-known private information.
* It can be NULL.
* |supp_priv_len| is the |supp_priv| length (in bytes).
* |der| is the returned encoded data. It must be freed by the caller.
* |der_len| is the returned size of the encoded data.
* |out_ctr| returns a pointer to the counter data which is embedded inside the
* encoded data. This allows the counter bytes to be updated without
* re-encoding.
*
* Returns: 1 if successfully encoded, or 0 otherwise.
* Assumptions: |der|, |der_len| & |out_ctr| are not NULL.
*/
static int
x942_encode_otherinfo(size_t keylen,
const unsigned char *cek_oid, size_t cek_oid_len,
const unsigned char *acvp, size_t acvp_len,
const unsigned char *partyu, size_t partyu_len,
const unsigned char *partyv, size_t partyv_len,
const unsigned char *supp_pub, size_t supp_pub_len,
const unsigned char *supp_priv, size_t supp_priv_len,
unsigned char **der, size_t *der_len,
unsigned char **out_ctr)
{
int ret = 0;
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