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/*
* Copyright 2010-2016 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the OpenSSL license (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 <stdio.h>
#include "internal/cryptlib.h"
#include <openssl/x509.h>
#include <openssl/x509v3.h>
#include <openssl/evp.h>
#include <openssl/cmac.h>
#include "crypto/evp.h"
/* The context structure and "key" is simply a CMAC_CTX */
static int pkey_cmac_init(EVP_PKEY_CTX *ctx)
{
ctx->data = CMAC_CTX_new();
if (ctx->data == NULL)
return 0;
ctx->keygen_info_count = 0;
return 1;
}
static int pkey_cmac_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src)
{
if (!pkey_cmac_init(dst))
return 0;
if (!CMAC_CTX_copy(dst->data, src->data))
return 0;
return 1;
}
static void pkey_cmac_cleanup(EVP_PKEY_CTX *ctx)
{
CMAC_CTX_free(ctx->data);
}
static int pkey_cmac_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
{
CMAC_CTX *cmkey = CMAC_CTX_new();
CMAC_CTX *cmctx = ctx->data;
if (cmkey == NULL)
return 0;
if (!CMAC_CTX_copy(cmkey, cmctx)) {
CMAC_CTX_free(cmkey);
return 0;
}
EVP_PKEY_assign(pkey, EVP_PKEY_CMAC, cmkey);
return 1;
}
static int int_update(EVP_MD_CTX *ctx, const void *data, size_t count)
{
if (!CMAC_Update(EVP_MD_CTX_pkey_ctx(ctx)->data, data, count))
return 0;
return 1;
}
static int cmac_signctx_init(EVP_PKEY_CTX *ctx, EVP_MD_CTX *mctx)
{
EVP_MD_CTX_set_flags(mctx, EVP_MD_CTX_FLAG_NO_INIT);
EVP_MD_CTX_set_update_fn(mctx, int_update);
return 1;
}
static int cmac_signctx(EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *siglen,
EVP_MD_CTX *mctx)
{
return CMAC_Final(ctx->data, sig, siglen);
}
static int pkey_cmac_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
{
CMAC_CTX *cmctx = ctx->data;
switch (type) {
case EVP_PKEY_CTRL_SET_MAC_KEY:
if (!p2 || p1 < 0)
return 0;
if (!CMAC_Init(cmctx, p2, p1, NULL, NULL))
return 0;
break;
case EVP_PKEY_CTRL_CIPHER:
if (!CMAC_Init(cmctx, NULL, 0, p2, ctx->engine))
return 0;
break;
case EVP_PKEY_CTRL_MD:
if (ctx->pkey && !CMAC_CTX_copy(ctx->data,
(CMAC_CTX *)ctx->pkey->pkey.ptr))
return 0;
if (!CMAC_Init(cmctx, NULL, 0, NULL, NULL))
return 0;
break;
default:
return -2;
}
return 1;
}
static int pkey_cmac_ctrl_str(EVP_PKEY_CTX *ctx,
const char *type, const char *value)
{
if (!value) {
return 0;
}
if (strcmp(type, "cipher") == 0) {
const EVP_CIPHER *c;
c = EVP_get_cipherbyname(value);
if (!c)
return 0;
return pkey_cmac_ctrl(ctx, EVP_PKEY_CTRL_CIPHER, -1, (void *)c);
}
if (strcmp(type, "key") == 0)
return EVP_PKEY_CTX_str2ctrl(ctx, EVP_PKEY_CTRL_SET_MAC_KEY, value);
if (strcmp(type, "hexkey") == 0)
return EVP_PKEY_CTX_hex2ctrl(ctx, EVP_PKEY_CTRL_SET_MAC_KEY, value);
return -2;
}
const EVP_PKEY_METHOD cmac_pkey_meth = {
EVP_PKEY_CMAC,
EVP_PKEY_FLAG_SIGCTX_CUSTOM,
pkey_cmac_init,
pkey_cmac_copy,
pkey_cmac_cleanup,
0, 0,
0,
pkey_cmac_keygen,
0, 0,
0, 0,
0, 0,
cmac_signctx_init,
cmac_signctx,
0, 0,
0, 0,
0, 0,
0, 0,
pkey_cmac_ctrl,
pkey_cmac_ctrl_str
};
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