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/*
* Copyright 2018-2021 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_dispatch.h>
#include <openssl/core_names.h>
#include <openssl/params.h>
#include <openssl/evp.h>
#include <openssl/err.h>
#include <openssl/proverr.h>
#include "crypto/poly1305.h"
#include "prov/implementations.h"
#include "prov/providercommon.h"
/*
* Forward declaration of everything implemented here. This is not strictly
* necessary for the compiler, but provides an assurance that the signatures
* of the functions in the dispatch table are correct.
*/
static OSSL_FUNC_mac_newctx_fn poly1305_new;
static OSSL_FUNC_mac_dupctx_fn poly1305_dup;
static OSSL_FUNC_mac_freectx_fn poly1305_free;
static OSSL_FUNC_mac_gettable_params_fn poly1305_gettable_params;
static OSSL_FUNC_mac_get_params_fn poly1305_get_params;
static OSSL_FUNC_mac_settable_ctx_params_fn poly1305_settable_ctx_params;
static OSSL_FUNC_mac_set_ctx_params_fn poly1305_set_ctx_params;
static OSSL_FUNC_mac_init_fn poly1305_init;
static OSSL_FUNC_mac_update_fn poly1305_update;
static OSSL_FUNC_mac_final_fn poly1305_final;
struct poly1305_data_st {
void *provctx;
POLY1305 poly1305; /* Poly1305 data */
};
static void *poly1305_new(void *provctx)
{
struct poly1305_data_st *ctx;
if (!ossl_prov_is_running())
return NULL;
ctx = OPENSSL_zalloc(sizeof(*ctx));
if (ctx != NULL)
ctx->provctx = provctx;
return ctx;
}
static void poly1305_free(void *vmacctx)
{
OPENSSL_free(vmacctx);
}
static void *poly1305_dup(void *vsrc)
{
struct poly1305_data_st *src = vsrc;
struct poly1305_data_st *dst;
if (!ossl_prov_is_running())
return NULL;
dst = poly1305_new(src->provctx);
if (dst == NULL)
return NULL;
dst->poly1305 = src->poly1305;
return dst;
}
static size_t poly1305_size(void)
{
return POLY1305_DIGEST_SIZE;
}
static int poly1305_init(void *vmacctx)
{
/* initialize the context in MAC_ctrl function */
return ossl_prov_is_running();
}
static int poly1305_update(void *vmacctx, const unsigned char *data,
size_t datalen)
{
struct poly1305_data_st *ctx = vmacctx;
if (datalen == 0)
return 1;
/* poly1305 has nothing to return in its update function */
Poly1305_Update(&ctx->poly1305, data, datalen);
return 1;
}
static int poly1305_final(void *vmacctx, unsigned char *out, size_t *outl,
size_t outsize)
{
struct poly1305_data_st *ctx = vmacctx;
if (!ossl_prov_is_running())
return 0;
Poly1305_Final(&ctx->poly1305, out);
*outl = poly1305_size();
return 1;
}
static const OSSL_PARAM known_gettable_params[] = {
OSSL_PARAM_size_t(OSSL_MAC_PARAM_SIZE, NULL),
OSSL_PARAM_END
};
static const OSSL_PARAM *poly1305_gettable_params(void *provctx)
{
return known_gettable_params;
}
static int poly1305_get_params(OSSL_PARAM params[])
{
OSSL_PARAM *p;
if ((p = OSSL_PARAM_locate(params, OSSL_MAC_PARAM_SIZE)) != NULL)
return OSSL_PARAM_set_size_t(p, poly1305_size());
return 1;
}
static const OSSL_PARAM known_settable_ctx_params[] = {
OSSL_PARAM_octet_string(OSSL_MAC_PARAM_KEY, NULL, 0),
OSSL_PARAM_END
};
static const OSSL_PARAM *poly1305_settable_ctx_params(ossl_unused void *provctx)
{
return known_settable_ctx_params;
}
static int poly1305_set_ctx_params(void *vmacctx, const OSSL_PARAM *params)
{
struct poly1305_data_st *ctx = vmacctx;
const OSSL_PARAM *p = NULL;
if ((p = OSSL_PARAM_locate_const(params, OSSL_MAC_PARAM_KEY)) != NULL) {
if (p->data_type != OSSL_PARAM_OCTET_STRING
|| p->data_size != POLY1305_KEY_SIZE) {
ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_KEY_LENGTH);
return 0;
}
Poly1305_Init(&ctx->poly1305, p->data);
}
return 1;
}
const OSSL_DISPATCH ossl_poly1305_functions[] = {
{ OSSL_FUNC_MAC_NEWCTX, (void (*)(void))poly1305_new },
{ OSSL_FUNC_MAC_DUPCTX, (void (*)(void))poly1305_dup },
{ OSSL_FUNC_MAC_FREECTX, (void (*)(void))poly1305_free },
{ OSSL_FUNC_MAC_INIT, (void (*)(void))poly1305_init },
{ OSSL_FUNC_MAC_UPDATE, (void (*)(void))poly1305_update },
{ OSSL_FUNC_MAC_FINAL, (void (*)(void))poly1305_final },
{ OSSL_FUNC_MAC_GETTABLE_PARAMS, (void (*)(void))poly1305_gettable_params },
{ OSSL_FUNC_MAC_GET_PARAMS, (void (*)(void))poly1305_get_params },
{ OSSL_FUNC_MAC_SETTABLE_CTX_PARAMS,
(void (*)(void))poly1305_settable_ctx_params },
{ OSSL_FUNC_MAC_SET_CTX_PARAMS, (void (*)(void))poly1305_set_ctx_params },
{ 0, NULL }
};
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