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/*
* Copyright 2007-2018 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/err.h>
#include "internal/siphash.h"
#include "siphash_local.h"
#include "internal/evp_int.h"
/* SIPHASH pkey context structure */
typedef struct siphash_pkey_ctx_st {
ASN1_OCTET_STRING ktmp; /* Temp storage for key */
SIPHASH ctx;
} SIPHASH_PKEY_CTX;
static int pkey_siphash_init(EVP_PKEY_CTX *ctx)
{
SIPHASH_PKEY_CTX *pctx;
if ((pctx = OPENSSL_zalloc(sizeof(*pctx))) == NULL) {
CRYPTOerr(CRYPTO_F_PKEY_SIPHASH_INIT, ERR_R_MALLOC_FAILURE);
return 0;
}
pctx->ktmp.type = V_ASN1_OCTET_STRING;
EVP_PKEY_CTX_set_data(ctx, pctx);
EVP_PKEY_CTX_set0_keygen_info(ctx, NULL, 0);
return 1;
}
static void pkey_siphash_cleanup(EVP_PKEY_CTX *ctx)
{
SIPHASH_PKEY_CTX *pctx = EVP_PKEY_CTX_get_data(ctx);
if (pctx != NULL) {
OPENSSL_clear_free(pctx->ktmp.data, pctx->ktmp.length);
OPENSSL_clear_free(pctx, sizeof(*pctx));
EVP_PKEY_CTX_set_data(ctx, NULL);
}
}
static int pkey_siphash_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src)
{
SIPHASH_PKEY_CTX *sctx, *dctx;
/* allocate memory for dst->data and a new SIPHASH_CTX in dst->data->ctx */
if (!pkey_siphash_init(dst))
return 0;
sctx = EVP_PKEY_CTX_get_data(src);
dctx = EVP_PKEY_CTX_get_data(dst);
if (ASN1_STRING_get0_data(&sctx->ktmp) != NULL &&
!ASN1_STRING_copy(&dctx->ktmp, &sctx->ktmp)) {
/* cleanup and free the SIPHASH_PKEY_CTX in dst->data */
pkey_siphash_cleanup(dst);
return 0;
}
memcpy(&dctx->ctx, &sctx->ctx, sizeof(SIPHASH));
return 1;
}
static int pkey_siphash_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
{
ASN1_OCTET_STRING *key;
SIPHASH_PKEY_CTX *pctx = EVP_PKEY_CTX_get_data(ctx);
if (ASN1_STRING_get0_data(&pctx->ktmp) == NULL)
return 0;
key = ASN1_OCTET_STRING_dup(&pctx->ktmp);
if (key == NULL)
return 0;
return EVP_PKEY_assign_SIPHASH(pkey, key);
}
static int int_update(EVP_MD_CTX *ctx, const void *data, size_t count)
{
SIPHASH_PKEY_CTX *pctx = EVP_PKEY_CTX_get_data(EVP_MD_CTX_pkey_ctx(ctx));
SipHash_Update(&pctx->ctx, data, count);
return 1;
}
static int siphash_signctx_init(EVP_PKEY_CTX *ctx, EVP_MD_CTX *mctx)
{
SIPHASH_PKEY_CTX *pctx = EVP_PKEY_CTX_get_data(ctx);
const unsigned char* key;
size_t len;
key = EVP_PKEY_get0_siphash(EVP_PKEY_CTX_get0_pkey(ctx), &len);
if (key == NULL || len != SIPHASH_KEY_SIZE)
return 0;
EVP_MD_CTX_set_flags(mctx, EVP_MD_CTX_FLAG_NO_INIT);
EVP_MD_CTX_set_update_fn(mctx, int_update);
return SipHash_Init(&pctx->ctx, key, 0, 0);
}
static int siphash_signctx(EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *siglen,
EVP_MD_CTX *mctx)
{
SIPHASH_PKEY_CTX *pctx = ctx->data;
*siglen = SipHash_hash_size(&pctx->ctx);
if (sig != NULL)
return SipHash_Final(&pctx->ctx, sig, *siglen);
return 1;
}
static int pkey_siphash_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
{
SIPHASH_PKEY_CTX *pctx = EVP_PKEY_CTX_get_data(ctx);
const unsigned char *key;
size_t len;
switch (type) {
case EVP_PKEY_CTRL_MD:
/* ignore */
break;
case EVP_PKEY_CTRL_SET_DIGEST_SIZE:
return SipHash_set_hash_size(&pctx->ctx, p1);
case EVP_PKEY_CTRL_SET_MAC_KEY:
case EVP_PKEY_CTRL_DIGESTINIT:
if (type == EVP_PKEY_CTRL_SET_MAC_KEY) {
/* user explicitly setting the key */
key = p2;
len = p1;
} else {
/* user indirectly setting the key via EVP_DigestSignInit */
key = EVP_PKEY_get0_siphash(EVP_PKEY_CTX_get0_pkey(ctx), &len);
}
if (key == NULL || len != SIPHASH_KEY_SIZE ||
!ASN1_OCTET_STRING_set(&pctx->ktmp, key, len))
return 0;
/* use default rounds (2,4) */
return SipHash_Init(&pctx->ctx, ASN1_STRING_get0_data(&pctx->ktmp),
0, 0);
default:
return -2;
}
return 1;
}
static int pkey_siphash_ctrl_str(EVP_PKEY_CTX *ctx,
const char *type, const char *value)
{
if (value == NULL)
return 0;
if (strcmp(type, "digestsize") == 0) {
size_t hash_size = atoi(value);
return pkey_siphash_ctrl(ctx, EVP_PKEY_CTRL_SET_DIGEST_SIZE, hash_size,
NULL);
}
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 siphash_pkey_meth = {
EVP_PKEY_SIPHASH,
EVP_PKEY_FLAG_SIGCTX_CUSTOM, /* we don't deal with a separate MD */
pkey_siphash_init,
pkey_siphash_copy,
pkey_siphash_cleanup,
0, 0,
0,
pkey_siphash_keygen,
0, 0,
0, 0,
0, 0,
siphash_signctx_init,
siphash_signctx,
0, 0,
0, 0,
0, 0,
0, 0,
pkey_siphash_ctrl,
pkey_siphash_ctrl_str
};
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