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/* NOCW */
/*
Please read the README file for condition of use, before
using this software.
Maurice Gittens <mgittens@gits.nl> January 1997
*/
#include <unistd.h>
#include <stdio.h>
#include <netinet/in.h>
#include <fcntl.h>
#include <strings.h>
#include <stdlib.h>
#include <openssl/rsa.h>
#include <openssl/evp.h>
#include <openssl/objects.h>
#include <openssl/x509.h>
#include <openssl/err.h>
#include <openssl/pem.h>
#include <openssl/ssl.h>
#include "loadkeys.h"
#define PUBFILE "cert.pem"
#define PRIVFILE "privkey.pem"
#define STDIN 0
#define STDOUT 1
void main_encrypt(void);
void main_decrypt(void);
static const char *usage = "Usage: example1 [-d]\n";
int main(int argc, char *argv[])
{
ERR_load_crypto_strings();
if ((argc == 1))
{
main_encrypt();
}
else if ((argc == 2) && !strcmp(argv[1],"-d"))
{
main_decrypt();
}
else
{
printf("%s",usage);
exit(1);
}
return 0;
}
void main_encrypt(void)
{
unsigned int ebuflen;
EVP_CIPHER_CTX ectx;
unsigned char iv[EVP_MAX_IV_LENGTH];
unsigned char *ekey[1];
int readlen;
int ekeylen, net_ekeylen;
EVP_PKEY *pubKey[1];
char buf[512];
char ebuf[512];
memset(iv, '\0', sizeof(iv));
pubKey[0] = ReadPublicKey(PUBFILE);
if(!pubKey[0])
{
fprintf(stderr,"Error: can't load public key");
exit(1);
}
ekey[0] = malloc(EVP_PKEY_size(pubKey[0]));
if (!ekey[0])
{
EVP_PKEY_free(pubKey[0]);
perror("malloc");
exit(1);
}
EVP_SealInit(&ectx,
EVP_des_ede3_cbc(),
ekey,
&ekeylen,
iv,
pubKey,
1);
net_ekeylen = htonl(ekeylen);
write(STDOUT, (char*)&net_ekeylen, sizeof(net_ekeylen));
write(STDOUT, ekey[0], ekeylen);
write(STDOUT, iv, sizeof(iv));
while(1)
{
readlen = read(STDIN, buf, sizeof(buf));
if (readlen <= 0)
{
if (readlen < 0)
perror("read");
break;
}
EVP_SealUpdate(&ectx, ebuf, &ebuflen, buf, readlen);
write(STDOUT, ebuf, ebuflen);
}
EVP_SealFinal(&ectx, ebuf, &ebuflen);
write(STDOUT, ebuf, ebuflen);
EVP_PKEY_free(pubKey[0]);
free(ekey[0]);
}
void main_decrypt(void)
{
char buf[520];
char ebuf[512];
unsigned int buflen;
EVP_CIPHER_CTX ectx;
unsigned char iv[EVP_MAX_IV_LENGTH];
unsigned char *encryptKey;
unsigned int ekeylen;
EVP_PKEY *privateKey;
memset(iv, '\0', sizeof(iv));
privateKey = ReadPrivateKey(PRIVFILE);
if (!privateKey)
{
fprintf(stderr, "Error: can't load private key");
exit(1);
}
read(STDIN, &ekeylen, sizeof(ekeylen));
ekeylen = ntohl(ekeylen);
if (ekeylen != EVP_PKEY_size(privateKey))
{
EVP_PKEY_free(privateKey);
fprintf(stderr, "keylength mismatch");
exit(1);
}
encryptKey = malloc(sizeof(char) * ekeylen);
if (!encryptKey)
{
EVP_PKEY_free(privateKey);
perror("malloc");
exit(1);
}
read(STDIN, encryptKey, ekeylen);
read(STDIN, iv, sizeof(iv));
EVP_OpenInit(&ectx,
EVP_des_ede3_cbc(),
encryptKey,
ekeylen,
iv,
privateKey);
while(1)
{
int readlen = read(STDIN, ebuf, sizeof(ebuf));
if (readlen <= 0)
{
if (readlen < 0)
perror("read");
break;
}
EVP_OpenUpdate(&ectx, buf, &buflen, ebuf, readlen);
write(STDOUT, buf, buflen);
}
EVP_OpenFinal(&ectx, buf, &buflen);
write(STDOUT, buf, buflen);
EVP_PKEY_free(privateKey);
free(encryptKey);
}
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