124 lines
1.8 KiB
C
124 lines
1.8 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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static const char *usage = "Usage: example4 [-d]\n";
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void do_encode(void);
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void do_decode(void);
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int main(int argc, char *argv[])
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{
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if ((argc == 1))
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{
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do_encode();
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}
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else if ((argc == 2) && !strcmp(argv[1],"-d"))
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{
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do_decode();
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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_encode()
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{
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char buf[BUFLEN];
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char ebuf[BUFLEN+24];
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unsigned int ebuflen;
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EVP_ENCODE_CTX ectx;
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EVP_EncodeInit(&ectx);
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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_EncodeUpdate(&ectx, ebuf, &ebuflen, buf, readlen);
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write(STDOUT, ebuf, ebuflen);
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}
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EVP_EncodeFinal(&ectx, ebuf, &ebuflen);
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write(STDOUT, ebuf, ebuflen);
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}
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void do_decode()
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{
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char buf[BUFLEN];
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char ebuf[BUFLEN+24];
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unsigned int ebuflen;
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EVP_ENCODE_CTX ectx;
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EVP_DecodeInit(&ectx);
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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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int rc;
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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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rc = EVP_DecodeUpdate(&ectx, ebuf, &ebuflen, buf, readlen);
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if (rc <= 0)
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{
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if (!rc)
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{
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write(STDOUT, ebuf, ebuflen);
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break;
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}
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fprintf(stderr, "Error: decoding message\n");
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return;
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}
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write(STDOUT, ebuf, ebuflen);
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}
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EVP_DecodeFinal(&ectx, ebuf, &ebuflen);
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write(STDOUT, ebuf, ebuflen);
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}
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