87 lines
1.6 KiB
C
87 lines
1.6 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 <stdio.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/stat.h>
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#include <openssl/evp.h>
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#define STDIN 0
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#define STDOUT 1
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#define BUFLEN 512
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#define INIT_VECTOR "12345678"
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#define ENCRYPT 1
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#define DECRYPT 0
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#define ALG EVP_des_ede3_cbc()
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static const char *usage = "Usage: example3 [-d] password\n";
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void do_cipher(char *,int);
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int main(int argc, char *argv[])
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{
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if ((argc == 2))
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{
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do_cipher(argv[1],ENCRYPT);
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}
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else if ((argc == 3) && !strcmp(argv[1],"-d"))
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{
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do_cipher(argv[2],DECRYPT);
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}
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else
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{
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fprintf(stderr,"%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 do_cipher(char *pw, int operation)
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{
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char buf[BUFLEN];
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char ebuf[BUFLEN + 8];
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unsigned int ebuflen; /* rc; */
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unsigned char iv[EVP_MAX_IV_LENGTH], key[EVP_MAX_KEY_LENGTH];
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/* unsigned int ekeylen, net_ekeylen; */
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EVP_CIPHER_CTX ectx;
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memcpy(iv, INIT_VECTOR, sizeof(iv));
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EVP_BytesToKey(ALG, EVP_md5(), "salu", pw, strlen(pw), 1, key, iv);
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EVP_CIPHER_CTX_init(&ectx);
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EVP_CipherInit_ex(&ectx, ALG, NULL, key, iv, operation);
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while(1)
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{
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int readlen = read(STDIN, buf, sizeof(buf));
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if (readlen <= 0)
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{
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if (!readlen)
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break;
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else
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{
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perror("read");
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exit(1);
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}
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}
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EVP_CipherUpdate(&ectx, ebuf, &ebuflen, buf, readlen);
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write(STDOUT, ebuf, ebuflen);
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}
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EVP_CipherFinal_ex(&ectx, ebuf, &ebuflen);
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EVP_CIPHER_CTX_cleanup(&ectx);
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write(STDOUT, ebuf, ebuflen);
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}
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