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/* gcry.c - rsyslog's libgcrypt based crypto provider
*
* Copyright 2013 Adiscon GmbH.
*
* This file is part of rsyslog.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
* -or-
* see COPYING.ASL20 in the source distribution
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdio.h>
#include <gcrypt.h>
#include "rsyslog.h"
#include "libgcry.h"
#define GCRY_CIPHER GCRY_CIPHER_3DES // TODO: make configurable
static inline gcryfile
gcryfileConstruct(gcryctx ctx)
{
gcryfile gf;
if((gf = calloc(1, sizeof(struct gcryfile_s))) == NULL)
goto done;
gf->ctx = ctx;
done: return gf;
}
gcryctx
gcryCtxNew(void)
{
gcryctx ctx;
ctx = calloc(1, sizeof(struct gcryctx_s));
return ctx;
}
int
gcryfileDestruct(gcryfile gf)
{
int r = 0;
if(gf == NULL)
goto done;
free(gf);
done: return r;
}
void
rsgcryCtxDel(gcryctx ctx)
{
if(ctx != NULL) {
free(ctx);
}
}
static inline void
addPadding(gcryfile pF, uchar *buf, size_t *plen)
{
unsigned i;
size_t nPad;
nPad = (pF->blkLength - *plen % pF->blkLength) % pF->blkLength;
dbgprintf("DDDD: addPadding %d chars, blkLength %d, mod %d, pad %d\n",
*plen, pF->blkLength, *plen % pF->blkLength, nPad);
for(i = 0 ; i < nPad ; ++i)
buf[(*plen)+i] = 0x00;
(*plen)+= nPad;
}
static inline void
removePadding(char *buf, size_t *plen)
{
unsigned len = (unsigned) *plen;
unsigned iSrc, iDst;
char *frstNUL;
frstNUL = strchr(buf, 0x00);
if(frstNUL == NULL)
goto done;
iDst = iSrc = frstNUL - buf;
while(iSrc < len) {
if(buf[iSrc] != 0x00)
buf[iDst++] = buf[iSrc];
++iSrc;
}
*plen = iDst;
done: return;
}
/* returns 0 on succes, positive if key length does not match and key
* of return value size is required.
*/
int
rsgcrySetKey(gcryctx ctx, unsigned char *key, uint16_t keyLen)
{
uint16_t reqKeyLen = gcry_cipher_get_algo_keylen(GCRY_CIPHER);
int r;
if(keyLen != reqKeyLen) {
r = reqKeyLen;
goto done;
}
ctx->keyLen = keyLen;
ctx->key = malloc(keyLen);
memcpy(ctx->key, key, keyLen);
r = 0;
done: return r;
}
rsRetVal
rsgcryInitCrypt(gcryctx ctx, gcryfile *pgf, int gcry_mode, char *iniVector)
{
gcry_error_t gcryError;
gcryfile gf = NULL;
DEFiRet;
CHKmalloc(gf = gcryfileConstruct(ctx));
gf->blkLength = gcry_cipher_get_algo_blklen(GCRY_CIPHER);
gcryError = gcry_cipher_open(
&gf->chd, // gcry_cipher_hd_t *
GCRY_CIPHER, // int
gcry_mode, // int
0); // unsigned int
if (gcryError) {
dbgprintf("gcry_cipher_open failed: %s/%s\n",
gcry_strsource(gcryError),
gcry_strerror(gcryError));
ABORT_FINALIZE(RS_RET_ERR);
}
gcryError = gcry_cipher_setkey(gf->chd, gf->ctx->key, gf->ctx->keyLen);
if (gcryError) {
dbgprintf("gcry_cipher_setkey failed: %s/%s\n",
gcry_strsource(gcryError),
gcry_strerror(gcryError));
ABORT_FINALIZE(RS_RET_ERR);
}
gcryError = gcry_cipher_setiv(gf->chd, iniVector, gf->blkLength);
if (gcryError) {
dbgprintf("gcry_cipher_setiv failed: %s/%s\n",
gcry_strsource(gcryError),
gcry_strerror(gcryError));
ABORT_FINALIZE(RS_RET_ERR);
}
*pgf = gf;
finalize_it:
if(iRet != RS_RET_OK && gf != NULL)
gcryfileDestruct(gf);
RETiRet;
}
int
rsgcryEncrypt(gcryfile pF, uchar *buf, size_t *len)
{
int gcryError;
DEFiRet;
if(*len == 0)
FINALIZE;
addPadding(pF, buf, len);
gcryError = gcry_cipher_encrypt(pF->chd, buf, *len, NULL, 0);
if(gcryError) {
dbgprintf("gcry_cipher_encrypt failed: %s/%s\n",
gcry_strsource(gcryError),
gcry_strerror(gcryError));
ABORT_FINALIZE(RS_RET_ERR);
}
finalize_it:
RETiRet;
}
/* module-init dummy for potential later use */
int
rsgcryInit(void)
{
return 0;
}
/* module-deinit dummy for potential later use */
void
rsgcryExit(void)
{
return;
}
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