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/*
* Copyright 2018 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/evp.h>
#include "internal/evp_int.h"
#include "internal/poly1305.h"
#include "internal/cryptlib.h"
#include "poly1305_local.h"
/* typedef EVP_MAC_IMPL */
struct evp_mac_impl_st {
POLY1305 *ctx; /* poly1305 context */
};
static EVP_MAC_IMPL *poly1305_new(void)
{
EVP_MAC_IMPL *ctx;
if ((ctx = OPENSSL_zalloc(sizeof(*ctx))) == NULL
|| (ctx->ctx = OPENSSL_zalloc(sizeof(POLY1305))) == NULL) {
OPENSSL_free(ctx);
return 0;
}
return ctx;
}
static void poly1305_free(EVP_MAC_IMPL *ctx)
{
if (ctx != NULL) {
OPENSSL_free(ctx->ctx);
OPENSSL_free(ctx);
}
}
static int poly1305_copy(EVP_MAC_IMPL *dst, EVP_MAC_IMPL *src)
{
*dst->ctx = *src->ctx;
return 1;
}
static size_t poly1305_size(EVP_MAC_IMPL *ctx)
{
return POLY1305_DIGEST_SIZE;
}
static int poly1305_init(EVP_MAC_IMPL *ctx)
{
/* initialize the context in MAC_ctrl function */
return 1;
}
static int poly1305_update(EVP_MAC_IMPL *ctx, const unsigned char *data,
size_t datalen)
{
POLY1305 *poly_ctx = ctx->ctx;
/* poly1305 has nothing to return in its update function */
Poly1305_Update(poly_ctx, data, datalen);
return 1;
}
static int poly1305_final(EVP_MAC_IMPL *ctx, unsigned char *out)
{
POLY1305 *poly_ctx = ctx->ctx;
Poly1305_Final(poly_ctx, out);
return 1;
}
static int poly1305_ctrl(EVP_MAC_IMPL *ctx, int cmd, va_list args)
{
POLY1305 *poly_ctx = ctx->ctx;
unsigned char *key;
size_t keylen;
switch (cmd) {
case EVP_MAC_CTRL_SET_KEY:
key = va_arg(args, unsigned char *);
keylen = va_arg(args, size_t);
if (keylen != POLY1305_KEY_SIZE) {
EVPerr(EVP_F_POLY1305_CTRL, EVP_R_INVALID_KEY_LENGTH);
return 0;
}
Poly1305_Init(poly_ctx, key);
return 1;
default:
return -2;
}
return 1;
}
static int poly1305_ctrl_int(EVP_MAC_IMPL *ctx, int cmd, ...)
{
int rv;
va_list args;
va_start(args, cmd);
rv = poly1305_ctrl(ctx, cmd, args);
va_end(args);
return rv;
}
static int poly1305_ctrl_str_cb(void *ctx, int cmd, void *buf, size_t buflen)
{
return poly1305_ctrl_int(ctx, cmd, buf, buflen);
}
static int poly1305_ctrl_str(EVP_MAC_IMPL *ctx,
const char *type, const char *value)
{
if (value == NULL)
return 0;
if (strcmp(type, "key") == 0)
return EVP_str2ctrl(poly1305_ctrl_str_cb, ctx, EVP_MAC_CTRL_SET_KEY,
value);
if (strcmp(type, "hexkey") == 0)
return EVP_hex2ctrl(poly1305_ctrl_str_cb, ctx, EVP_MAC_CTRL_SET_KEY,
value);
return -2;
}
const EVP_MAC poly1305_meth = {
EVP_MAC_POLY1305,
poly1305_new,
poly1305_copy,
poly1305_free,
poly1305_size,
poly1305_init,
poly1305_update,
poly1305_final,
poly1305_ctrl,
poly1305_ctrl_str
};
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