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/*
* Copyright 2007-2016 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/hmac.h>
#include "internal/evp_int.h"
/* HMAC pkey context structure */
typedef struct {
const EVP_MD *md; /* MD for HMAC use */
ASN1_OCTET_STRING ktmp; /* Temp storage for key */
HMAC_CTX *ctx;
} HMAC_PKEY_CTX;
static int pkey_hmac_init(EVP_PKEY_CTX *ctx)
{
HMAC_PKEY_CTX *hctx;
hctx = OPENSSL_zalloc(sizeof(*hctx));
if (hctx == NULL)
return 0;
hctx->ktmp.type = V_ASN1_OCTET_STRING;
hctx->ctx = HMAC_CTX_new();
if (hctx->ctx == NULL) {
OPENSSL_free(hctx);
return 0;
}
ctx->data = hctx;
ctx->keygen_info_count = 0;
return 1;
}
static void pkey_hmac_cleanup(EVP_PKEY_CTX *ctx);
static int pkey_hmac_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src)
{
HMAC_PKEY_CTX *sctx, *dctx;
/* allocate memory for dst->data and a new HMAC_CTX in dst->data->ctx */
if (!pkey_hmac_init(dst))
return 0;
sctx = EVP_PKEY_CTX_get_data(src);
dctx = EVP_PKEY_CTX_get_data(dst);
dctx->md = sctx->md;
if (!HMAC_CTX_copy(dctx->ctx, sctx->ctx))
goto err;
if (sctx->ktmp.data) {
if (!ASN1_OCTET_STRING_set(&dctx->ktmp,
sctx->ktmp.data, sctx->ktmp.length))
goto err;
}
return 1;
err:
/* release HMAC_CTX in dst->data->ctx and memory allocated for dst->data */
pkey_hmac_cleanup (dst);
return 0;
}
static void pkey_hmac_cleanup(EVP_PKEY_CTX *ctx)
{
HMAC_PKEY_CTX *hctx = EVP_PKEY_CTX_get_data(ctx);
if (hctx != NULL) {
HMAC_CTX_free(hctx->ctx);
OPENSSL_clear_free(hctx->ktmp.data, hctx->ktmp.length);
OPENSSL_free(hctx);
EVP_PKEY_CTX_set_data(ctx, NULL);
}
}
static int pkey_hmac_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
{
ASN1_OCTET_STRING *hkey = NULL;
HMAC_PKEY_CTX *hctx = ctx->data;
if (!hctx->ktmp.data)
return 0;
hkey = ASN1_OCTET_STRING_dup(&hctx->ktmp);
if (!hkey)
return 0;
EVP_PKEY_assign(pkey, EVP_PKEY_HMAC, hkey);
return 1;
}
static int int_update(EVP_MD_CTX *ctx, const void *data, size_t count)
{
HMAC_PKEY_CTX *hctx = EVP_MD_CTX_pkey_ctx(ctx)->data;
if (!HMAC_Update(hctx->ctx, data, count))
return 0;
return 1;
}
static int hmac_signctx_init(EVP_PKEY_CTX *ctx, EVP_MD_CTX *mctx)
{
HMAC_PKEY_CTX *hctx = ctx->data;
HMAC_CTX_set_flags(hctx->ctx,
EVP_MD_CTX_test_flags(mctx, ~EVP_MD_CTX_FLAG_NO_INIT));
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 hmac_signctx(EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *siglen,
EVP_MD_CTX *mctx)
{
unsigned int hlen;
HMAC_PKEY_CTX *hctx = ctx->data;
int l = EVP_MD_CTX_size(mctx);
if (l < 0)
return 0;
*siglen = l;
if (!sig)
return 1;
if (!HMAC_Final(hctx->ctx, sig, &hlen))
return 0;
*siglen = (size_t)hlen;
return 1;
}
static int pkey_hmac_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
{
HMAC_PKEY_CTX *hctx = ctx->data;
ASN1_OCTET_STRING *key;
switch (type) {
case EVP_PKEY_CTRL_SET_MAC_KEY:
if ((!p2 && p1 > 0) || (p1 < -1))
return 0;
if (!ASN1_OCTET_STRING_set(&hctx->ktmp, p2, p1))
return 0;
break;
case EVP_PKEY_CTRL_MD:
hctx->md = p2;
break;
case EVP_PKEY_CTRL_DIGESTINIT:
key = (ASN1_OCTET_STRING *)ctx->pkey->pkey.ptr;
if (!HMAC_Init_ex(hctx->ctx, key->data, key->length, hctx->md,
ctx->engine))
return 0;
break;
default:
return -2;
}
return 1;
}
static int pkey_hmac_ctrl_str(EVP_PKEY_CTX *ctx,
const char *type, const char *value)
{
if (!value) {
return 0;
}
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 hmac_pkey_meth = {
EVP_PKEY_HMAC,
0,
pkey_hmac_init,
pkey_hmac_copy,
pkey_hmac_cleanup,
0, 0,
0,
pkey_hmac_keygen,
0, 0,
0, 0,
0, 0,
hmac_signctx_init,
hmac_signctx,
0, 0,
0, 0,
0, 0,
0, 0,
pkey_hmac_ctrl,
pkey_hmac_ctrl_str
};
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