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/*
Serpent Cipher from libmcrypt
*/
#include "dact.h"
#include "cipher_serpent.h"
#ifdef HAVE_MCRYPT
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif
#include <fcntl.h>
#include <stdio.h>
#ifdef TIME_WITH_SYS_TIME
#include <sys/time.h>
#include <time.h>
#else
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#else
#include <time.h>
#endif
#endif
#include "parse.h"
#include "ui.h"
#if defined(USE_MODULES) && defined(AS_MODULE)
#include "module.h"
uint32_t DC_NUM=2;
uint32_t DC_TYPE=DACT_MOD_TYPE_ENC;
void *DC_ALGO=cipher_serpent;
char *DC_NAME="serpent (MOD)";
#endif
MCRYPT mcrypt_tdid;
int cipher_serpent(const char *inblock, char *outblock, const int blksize, char *key, const int mode) {
static unsigned char *IV;
switch (mode) {
case (DACT_MODE_CINIT+DACT_MODE_CDEC):
case (DACT_MODE_CINIT+DACT_MODE_CENC):
case DACT_MODE_CINIT:
return(cipher_serpent_init(mode, key, IV));
break;
case DACT_MODE_CDEC:
return(cipher_serpent_decrypt(inblock, outblock, blksize, key, IV));
break;
case DACT_MODE_CENC:
return(cipher_serpent_encrypt(inblock, outblock, blksize, key, IV));
break;
}
return(0);
}
int cipher_serpent_init(const int mode, char *key, unsigned char *IV) {
char *password;
int plen, i;
unsigned char buff;
char *mime_buf;
#ifdef RANDOM_DEV
int fd;
fd=open(RANDOM_DEV, O_RDONLY);
if (fd<0) {
#endif
srand(time(NULL)+rand());
#ifdef RANDOM_DEV
}
#endif
mcrypt_tdid=mcrypt_module_open("serpent", NULL, "cfb", NULL);
if (mcrypt_tdid==MCRYPT_FAILED) {
#ifdef RANDOM_DEV
if (fd>=0) close(fd);
#endif
return(-1);
}
password=dact_ui_getuserinput("Enter your passphrase: ", 128, 1);
memset(key, 1, 16);
plen=strlen(password);
if (plen<16) plen=16;
memcpy(key, password, plen);
if ((mode-DACT_MODE_CINIT)==DACT_MODE_CENC) {
/* mhash_keygen(KEYGEN_MCRYPT, MHASH_MD5, key, 16, NULL, 0, password, strlen(password)); */
plen=mcrypt_enc_get_iv_size(mcrypt_tdid);
IV=malloc(plen);
for (i=0; i<plen; i++) {
#ifdef RANDOM_DEV
if (fd>=0) {
read(fd, &buff, 1);
} else {
#endif
srand(time(NULL)+rand());
buff=(int) ((256.0*rand())/(RAND_MAX+1.0));
#ifdef RANDOM_DEV
}
#endif
IV[i]=buff;
}
mime_buf=mimes64(IV, &plen);
fprintf(stderr, "Magic [needed for decryption]: %s\n", mime_buf);
free(mime_buf);
} else {
plen=mcrypt_enc_get_iv_size(mcrypt_tdid);
IV=dact_ui_getuserinput("Enter your magic key: ", plen*3, 0);
mime_buf=demime64(IV);
memcpy(IV, mime_buf, plen);
free(mime_buf);
}
#ifdef RANDOM_DEV
if (fd>=0) close(fd);
#endif
i=mcrypt_generic_init(mcrypt_tdid, key, 16, IV);
if (i<0) {
mcrypt_perror(i);
return(-1);
}
return(16);
}
int cipher_serpent_encrypt(const char *inblk, char *outblk, int blksize, char *key, unsigned char *IV) {
int i;
memcpy(outblk, inblk, blksize);
for (i=0; i<blksize; i++) {
mcrypt_generic(mcrypt_tdid, &outblk[i], 1);
}
return(blksize);
}
int cipher_serpent_decrypt(const char *inblk, char *outblk, int blksize, char *key, unsigned char *IV) {
int i;
memcpy(outblk, inblk, blksize);
for (i=0; i<blksize; i++) {
mdecrypt_generic(mcrypt_tdid, outblk+i, 1);
}
return(blksize);
}
#else
int cipher_serpent(const char *inblock, char *outblock, const int blksize, char *key, const int mode) {
return(0);
}
#endif
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