1/* NOCW */ 2/* 3 Please read the README file for condition of use, before 4 using this software. 5 6 Maurice Gittens <mgittens@gits.nl> January 1997 7 8*/ 9 10#include <stdio.h> 11#include <unistd.h> 12#include <fcntl.h> 13#include <sys/stat.h> 14#include <openssl/evp.h> 15 16#define STDIN 0 17#define STDOUT 1 18#define BUFLEN 512 19#define INIT_VECTOR "12345678" 20#define ENCRYPT 1 21#define DECRYPT 0 22#define ALG EVP_des_ede3_cbc() 23 24static const char *usage = "Usage: example3 [-d] password\n"; 25 26void do_cipher(char *,int); 27 28int main(int argc, char *argv[]) 29{ 30 if ((argc == 2)) 31 { 32 do_cipher(argv[1],ENCRYPT); 33 } 34 else if ((argc == 3) && !strcmp(argv[1],"-d")) 35 { 36 do_cipher(argv[2],DECRYPT); 37 } 38 else 39 { 40 fprintf(stderr,"%s", usage); 41 exit(1); 42 } 43 44 return 0; 45} 46 47void do_cipher(char *pw, int operation) 48{ 49 char buf[BUFLEN]; 50 char ebuf[BUFLEN + 8]; 51 unsigned int ebuflen; /* rc; */ 52 unsigned char iv[EVP_MAX_IV_LENGTH], key[EVP_MAX_KEY_LENGTH]; 53 /* unsigned int ekeylen, net_ekeylen; */ 54 EVP_CIPHER_CTX ectx; 55 56 memcpy(iv, INIT_VECTOR, sizeof(iv)); 57 58 EVP_BytesToKey(ALG, EVP_md5(), "salu", pw, strlen(pw), 1, key, iv); 59 60 EVP_CIPHER_CTX_init(&ectx); 61 EVP_CipherInit_ex(&ectx, ALG, NULL, key, iv, operation); 62 63 while(1) 64 { 65 int readlen = read(STDIN, buf, sizeof(buf)); 66 67 if (readlen <= 0) 68 { 69 if (!readlen) 70 break; 71 else 72 { 73 perror("read"); 74 exit(1); 75 } 76 } 77 78 EVP_CipherUpdate(&ectx, ebuf, &ebuflen, buf, readlen); 79 80 write(STDOUT, ebuf, ebuflen); 81 } 82 83 EVP_CipherFinal_ex(&ectx, ebuf, &ebuflen); 84 EVP_CIPHER_CTX_cleanup(&ectx); 85 86 write(STDOUT, ebuf, ebuflen); 87} 88