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/* apps/rand.c */
#include "apps.h"
#include <ctype.h>
#include <stdio.h>
#include <string.h>
#include <openssl/bio.h>
#include <openssl/err.h>
#include <openssl/rand.h>
#include <openssl/engine.h>
#undef PROG
#define PROG rand_main
/* -out file - write to file
* -rand file:file - PRNG seed files
* -base64 - encode output
* num - write 'num' bytes
*/
int MAIN(int, char **);
int MAIN(int argc, char **argv)
{
ENGINE *e = NULL;
int i, r, ret = 1;
int badopt;
char *outfile = NULL;
char *inrand = NULL;
int base64 = 0;
BIO *out = NULL;
int num = -1;
char *engine=NULL;
apps_startup();
if (bio_err == NULL)
if ((bio_err = BIO_new(BIO_s_file())) != NULL)
BIO_set_fp(bio_err, stderr, BIO_NOCLOSE|BIO_FP_TEXT);
badopt = 0;
i = 0;
while (!badopt && argv[++i] != NULL)
{
if (strcmp(argv[i], "-out") == 0)
{
if ((argv[i+1] != NULL) && (outfile == NULL))
outfile = argv[++i];
else
badopt = 1;
}
else if (strcmp(argv[i], "-engine") == 0)
{
if ((argv[i+1] != NULL) && (engine == NULL))
engine = argv[++i];
else
badopt = 1;
}
else if (strcmp(argv[i], "-rand") == 0)
{
if ((argv[i+1] != NULL) && (inrand == NULL))
inrand = argv[++i];
else
badopt = 1;
}
else if (strcmp(argv[i], "-base64") == 0)
{
if (!base64)
base64 = 1;
else
badopt = 1;
}
else if (isdigit((unsigned char)argv[i][0]))
{
if (num < 0)
{
r = sscanf(argv[i], "%d", &num);
if (r == 0 || num < 0)
badopt = 1;
}
else
badopt = 1;
}
else
badopt = 1;
}
if (num < 0)
badopt = 1;
if (badopt)
{
BIO_printf(bio_err, "Usage: rand [options] num\n");
BIO_printf(bio_err, "where options are\n");
BIO_printf(bio_err, "-out file - write to file\n");
BIO_printf(bio_err, "-engine e - use engine e, possibly a hardware device.\n");
BIO_printf(bio_err, "-rand file%cfile%c... - seed PRNG from files\n", LIST_SEPARATOR_CHAR, LIST_SEPARATOR_CHAR);
BIO_printf(bio_err, "-base64 - encode output\n");
goto err;
}
if (engine != NULL)
{
if((e = ENGINE_by_id(engine)) == NULL)
{
BIO_printf(bio_err,"invalid engine \"%s\"\n",
engine);
goto err;
}
if(!ENGINE_set_default(e, ENGINE_METHOD_ALL))
{
BIO_printf(bio_err,"can't use that engine\n");
goto err;
}
BIO_printf(bio_err,"engine \"%s\" set.\n", engine);
/* Free our "structural" reference. */
ENGINE_free(e);
}
app_RAND_load_file(NULL, bio_err, (inrand != NULL));
if (inrand != NULL)
BIO_printf(bio_err,"%ld semi-random bytes loaded\n",
app_RAND_load_files(inrand));
out = BIO_new(BIO_s_file());
if (out == NULL)
goto err;
if (outfile != NULL)
r = BIO_write_filename(out, outfile);
else
{
r = BIO_set_fp(out, stdout, BIO_NOCLOSE | BIO_FP_TEXT);
#ifdef OPENSSL_SYS_VMS
{
BIO *tmpbio = BIO_new(BIO_f_linebuffer());
out = BIO_push(tmpbio, out);
}
#endif
}
if (r <= 0)
goto err;
if (base64)
{
BIO *b64 = BIO_new(BIO_f_base64());
if (b64 == NULL)
goto err;
out = BIO_push(b64, out);
}
while (num > 0)
{
unsigned char buf[4096];
int chunk;
chunk = num;
if (chunk > sizeof buf)
chunk = sizeof buf;
r = RAND_bytes(buf, chunk);
if (r <= 0)
goto err;
BIO_write(out, buf, chunk);
num -= chunk;
}
BIO_flush(out);
app_RAND_write_file(NULL, bio_err);
ret = 0;
err:
ERR_print_errors(bio_err);
if (out)
BIO_free_all(out);
EXIT(ret);
}
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