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/*
* Copyright 2025 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
*/
#include <openssl/core_object.h>
#include <openssl/core_names.h>
#include <openssl/crypto.h>
#include <openssl/err.h>
#include <openssl/params.h>
#include "prov/endecoder_local.h"
#include "crypto/lms.h"
#include "prov/bio.h"
#include "prov/implementations.h"
static OSSL_FUNC_decoder_newctx_fn lmsxdr2key_newctx;
static OSSL_FUNC_decoder_freectx_fn lmsxdr2key_freectx;
static OSSL_FUNC_decoder_decode_fn lmsxdr2key_decode;
static OSSL_FUNC_decoder_export_object_fn lmsxdr2key_export_object;
/* Context used for xdr to key decoding. */
struct lmsxdr2key_ctx_st {
PROV_CTX *provctx;
int selection; /* The selection that is passed to lmsxdr2key_decode() */
};
static void *lmsxdr2key_newctx(void *provctx)
{
struct lmsxdr2key_ctx_st *ctx = OPENSSL_zalloc(sizeof(*ctx));
if (ctx != NULL)
ctx->provctx = provctx;
return ctx;
}
static void lmsxdr2key_freectx(void *vctx)
{
struct lmsxdr2key_ctx_st *ctx = vctx;
OPENSSL_free(ctx);
}
static int lmsxdr2key_does_selection(void *provctx, int selection)
{
if (selection == 0)
return 1;
if ((selection & OSSL_KEYMGMT_SELECT_PUBLIC_KEY) != 0)
return 1;
return 0;
}
static int lmsxdr2key_decode(void *vctx, OSSL_CORE_BIO *cin, int selection,
OSSL_CALLBACK *data_cb, void *data_cbarg,
OSSL_PASSPHRASE_CALLBACK *pw_cb, void *pw_cbarg)
{
struct lmsxdr2key_ctx_st *ctx = vctx;
LMS_KEY *key = NULL;
unsigned char buf[LMS_MAX_PUBKEY];
size_t length;
int ok = 0, inlen, readlen;
BIO *in;
in = ossl_bio_new_from_core_bio(ctx->provctx, cin);
if (in == NULL)
return 0;
ctx->selection = selection;
/* Read the header to determine the size */
ERR_set_mark();
readlen = BIO_read(in, buf, 4);
ERR_pop_to_mark();
if (readlen != 4)
goto next;
length = ossl_lms_pubkey_length(buf, 4);
if (length <= 4)
goto next;
inlen = (int)length - 4;
ERR_set_mark();
readlen = BIO_read(in, buf + 4, inlen);
ERR_pop_to_mark();
if (readlen != inlen)
goto next;
if (selection == 0 || (selection & OSSL_KEYMGMT_SELECT_PUBLIC_KEY) != 0) {
key = ossl_lms_key_new(PROV_LIBCTX_OF(ctx->provctx));
if (key == NULL || !ossl_lms_pubkey_decode(buf, length, key)) {
ossl_lms_key_free(key);
key = NULL;
}
}
next:
/*
* Indicated that we successfully decoded something, or not at all.
* Ending up "empty handed" is not an error.
*/
ok = 1;
/*
* We free resources here so it's not held up during the callback, because
* we know the process is recursive and the allocated chunks of memory
* add up.
*/
BIO_free(in);
in = NULL;
if (key != NULL) {
OSSL_PARAM params[4];
int object_type = OSSL_OBJECT_PKEY;
params[0] =
OSSL_PARAM_construct_int(OSSL_OBJECT_PARAM_TYPE, &object_type);
params[1] =
OSSL_PARAM_construct_utf8_string(OSSL_OBJECT_PARAM_DATA_TYPE,
(char *)"lms", 0);
/* The address of the key becomes the octet string */
params[2] =
OSSL_PARAM_construct_octet_string(OSSL_OBJECT_PARAM_REFERENCE,
&key, sizeof(key));
params[3] = OSSL_PARAM_construct_end();
ok = data_cb(params, data_cbarg);
}
BIO_free(in);
ossl_lms_key_free(key);
return ok;
}
static int lmsxdr2key_export_object(void *vctx,
const void *reference, size_t reference_sz,
OSSL_CALLBACK *export_cb,
void *export_cbarg)
{
struct lmsxdr2key_ctx_st *ctx = vctx;
OSSL_FUNC_keymgmt_export_fn *export =
ossl_prov_get_keymgmt_export(ossl_lms_keymgmt_functions);
void *keydata;
if (reference_sz == sizeof(keydata) && export != NULL) {
int selection = ctx->selection;
if (selection == 0)
selection = OSSL_KEYMGMT_SELECT_PUBLIC_KEY;
/* The contents of the reference is the address to our object */
keydata = *(void **)reference;
return export(keydata, selection, export_cb, export_cbarg);
}
return 0;
}
const OSSL_DISPATCH ossl_xdr_to_lms_decoder_functions[] = {
{ OSSL_FUNC_DECODER_NEWCTX, (void (*)(void))lmsxdr2key_newctx },
{ OSSL_FUNC_DECODER_FREECTX, (void (*)(void))lmsxdr2key_freectx },
{ OSSL_FUNC_DECODER_DOES_SELECTION,
(void (*)(void))lmsxdr2key_does_selection },
{ OSSL_FUNC_DECODER_DECODE, (void (*)(void))lmsxdr2key_decode },
{ OSSL_FUNC_DECODER_EXPORT_OBJECT,
(void (*)(void))lmsxdr2key_export_object },
OSSL_DISPATCH_END
};
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