201 lines
3.4 KiB
C
201 lines
3.4 KiB
C
/* NOCW */
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/*
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Please read the README file for condition of use, before
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using this software.
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Maurice Gittens <mgittens@gits.nl> January 1997
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*/
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#include <unistd.h>
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#include <stdio.h>
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#include <netinet/in.h>
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#include <fcntl.h>
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#include <strings.h>
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#include <stdlib.h>
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#include <openssl/rsa.h>
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#include <openssl/evp.h>
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#include <openssl/objects.h>
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#include <openssl/x509.h>
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#include <openssl/err.h>
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#include <openssl/pem.h>
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#include <openssl/ssl.h>
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#include "loadkeys.h"
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#define PUBFILE "cert.pem"
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#define PRIVFILE "privkey.pem"
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#define STDIN 0
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#define STDOUT 1
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void main_encrypt(void);
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void main_decrypt(void);
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static const char *usage = "Usage: example1 [-d]\n";
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int main(int argc, char *argv[])
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{
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ERR_load_crypto_strings();
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if ((argc == 1))
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{
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main_encrypt();
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}
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else if ((argc == 2) && !strcmp(argv[1],"-d"))
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{
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main_decrypt();
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}
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else
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{
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printf("%s",usage);
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exit(1);
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}
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return 0;
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}
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void main_encrypt(void)
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{
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unsigned int ebuflen;
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EVP_CIPHER_CTX ectx;
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unsigned char iv[EVP_MAX_IV_LENGTH];
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unsigned char *ekey[1];
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int readlen;
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int ekeylen, net_ekeylen;
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EVP_PKEY *pubKey[1];
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char buf[512];
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char ebuf[512];
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memset(iv, '\0', sizeof(iv));
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pubKey[0] = ReadPublicKey(PUBFILE);
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if(!pubKey[0])
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{
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fprintf(stderr,"Error: can't load public key");
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exit(1);
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}
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ekey[0] = malloc(EVP_PKEY_size(pubKey[0]));
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if (!ekey[0])
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{
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EVP_PKEY_free(pubKey[0]);
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perror("malloc");
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exit(1);
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}
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EVP_SealInit(&ectx,
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EVP_des_ede3_cbc(),
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ekey,
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&ekeylen,
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iv,
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pubKey,
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1);
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net_ekeylen = htonl(ekeylen);
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write(STDOUT, (char*)&net_ekeylen, sizeof(net_ekeylen));
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write(STDOUT, ekey[0], ekeylen);
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write(STDOUT, iv, sizeof(iv));
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while(1)
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{
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readlen = read(STDIN, buf, sizeof(buf));
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if (readlen <= 0)
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{
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if (readlen < 0)
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perror("read");
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break;
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}
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EVP_SealUpdate(&ectx, ebuf, &ebuflen, buf, readlen);
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write(STDOUT, ebuf, ebuflen);
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}
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EVP_SealFinal(&ectx, ebuf, &ebuflen);
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write(STDOUT, ebuf, ebuflen);
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EVP_PKEY_free(pubKey[0]);
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free(ekey[0]);
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}
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void main_decrypt(void)
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{
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char buf[512];
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char ebuf[512];
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unsigned int buflen;
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EVP_CIPHER_CTX ectx;
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unsigned char iv[8];
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unsigned char *encryptKey;
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unsigned int ekeylen;
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EVP_PKEY *privateKey;
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memset(iv, '\0', sizeof(iv));
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privateKey = ReadPrivateKey(PRIVFILE);
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if (!privateKey)
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{
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fprintf(stderr, "Error: can't load private key");
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exit(1);
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}
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read(STDIN, &ekeylen, sizeof(ekeylen));
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ekeylen = ntohl(ekeylen);
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if (ekeylen != EVP_PKEY_size(privateKey))
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{
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EVP_PKEY_free(privateKey);
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fprintf(stderr, "keylength mismatch");
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exit(1);
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}
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encryptKey = malloc(sizeof(char) * ekeylen);
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if (!encryptKey)
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{
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EVP_PKEY_free(privateKey);
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perror("malloc");
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exit(1);
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}
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read(STDIN, encryptKey, ekeylen);
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read(STDIN, iv, sizeof(iv));
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EVP_OpenInit(&ectx,
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EVP_des_ede3_cbc(),
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encryptKey,
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ekeylen,
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iv,
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privateKey);
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while(1)
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{
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int readlen = read(STDIN, ebuf, sizeof(ebuf));
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if (readlen <= 0)
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{
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if (readlen < 0)
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perror("read");
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break;
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}
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EVP_OpenUpdate(&ectx, buf, &buflen, ebuf, readlen);
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write(STDOUT, buf, buflen);
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}
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EVP_OpenFinal(&ectx, buf, &buflen);
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write(STDOUT, buf, buflen);
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EVP_PKEY_free(privateKey);
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free(encryptKey);
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}
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