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Remove misleading secretbox example

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Frank Denis 2015-05-27 13:07:16 +02:00
parent a46076fa5b
commit f1943d346c
1 changed files with 0 additions and 102 deletions
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102
demos/secretbox.c
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@ -1,102 +0,0 @@
/*
* GraxRabble
* Demo programs for libsodium.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sodium.h> /* library header */
#include "demo_utils.h" /* utility functions shared by demos */
/*
* This is a wrapper around stream which does XOR automatically.
*
* Note that the buffer must be padded at the front. The same nonce must
* not be used; it should be safe to use a counter.
*
* Encrypted messages will be 16 bytes longer because a 16 byte
* authentication token will be prepended to the message.
*/
static int
secretbox(void)
{
unsigned char k[crypto_secretbox_KEYBYTES]; /* secret */
unsigned char n[crypto_secretbox_NONCEBYTES]; /* nonce */
unsigned char m[BUFFER_SIZE + crypto_secretbox_ZEROBYTES]; /* plain */
unsigned char c[BUFFER_SIZE + crypto_secretbox_ZEROBYTES]; /* cipher */
size_t mlen; /* length */
int r;
puts("Example: crypto_secretbox\n");
sodium_memzero(k, sizeof k);
prompt_input("Input your key > ", (char*)k, sizeof k);
/* nonce must be generated per message, safe to send with message */
puts("Generating nonce...");
randombytes_buf(n, sizeof n);
fputs("Nonce: ", stdout);
print_hex(n, sizeof n);
putchar('\n');
putchar('\n');
mlen = prompt_input("Input your message > ",
(char*)m + crypto_secretbox_ZEROBYTES,
sizeof m - crypto_secretbox_ZEROBYTES);
/* must zero at least the padding */
sodium_memzero(m, crypto_secretbox_ZEROBYTES);
puts("Notice the 32 bytes of zero");
print_hex(m, mlen + crypto_box_ZEROBYTES);
putchar('\n');
/* encrypting message */
printf("Encrypting with %s\n", crypto_secretbox_primitive());
crypto_secretbox(c, m, mlen + crypto_secretbox_ZEROBYTES, n, k);
putchar('\n');
puts("Notice the prepended 16 byte authentication token");
puts("Sending message...");
puts("Format: nonce::message");
fputs("Ciphertext: ", stdout);
print_hex(n, sizeof n);
fputs("::", stdout);
print_hex(c, mlen + crypto_secretbox_ZEROBYTES);
putchar('\n');
putchar('\n');
/* decrypting message */
puts("Opening message...");
/* must zero at least the padding */
sodium_memzero(c, crypto_secretbox_BOXZEROBYTES);
r = crypto_secretbox_open(m, c, mlen + crypto_secretbox_ZEROBYTES, n, k);
puts("Notice the 32 bytes of zero");
print_hex(m, mlen + crypto_box_ZEROBYTES);
putchar('\n');
putchar('\n');
print_verification(r);
if (r == 0)
printf("Plaintext: %s\n\n", m + crypto_secretbox_ZEROBYTES);
sodium_memzero(k, sizeof k); /* wipe sensitive data */
sodium_memzero(n, sizeof n);
sodium_memzero(m, sizeof m);
sodium_memzero(c, sizeof c);
return r;
}
int
main(void)
{
sodium_init();
printf("Using LibSodium %s\n", sodium_version_string());
return secretbox() != 0;
}