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/* This example demonstrates how to use the low-level interface to
encrypt a file. */
#define _GNU_SOURCE
#include <error.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include <time.h>
#include <sequoia.h>
int
main (int argc, char **argv)
{
struct stat st;
int fd;
uint8_t *b;
sq_status_t rc;
sq_error_t err;
int use_armor = 1;
sq_tpk_t tpk;
sq_writer_t sink;
sq_writer_stack_t writer = NULL;
void *cipher = NULL;
size_t cipher_bytes = 0;
if (argc != 2)
error (1, 0, "Usage: %s <keyfile> <plain >cipher", argv[0]);
if (stat (argv[1], &st))
error (1, errno, "%s", argv[1]);
fd = open (argv[1], O_RDONLY);
if (fd == -1)
error (1, errno, "%s", argv[1]);
b = mmap (NULL, st.st_size, PROT_READ, MAP_SHARED, fd, 0);
close (fd);
if (b == MAP_FAILED)
error (1, errno, "mmap");
tpk = sq_tpk_from_bytes (&err, b, st.st_size);
if (tpk == NULL)
error (1, 0, "sq_packet_parser_from_bytes: %s", sq_error_string (err));
sink = sq_writer_alloc (&cipher, &cipher_bytes);
if (use_armor)
sink = sq_armor_writer_new (&err, sink, SQ_ARMOR_KIND_MESSAGE,
NULL, 0);
writer = sq_writer_stack_message (sink);
writer = sq_encryptor_new (&err,
writer,
NULL, 0, /* no passwords */
&tpk, 1,
SQ_ENCRYPTION_MODE_FOR_TRANSPORT);
if (writer == NULL)
error (1, 0, "sq_encryptor_new: %s", sq_error_string (err));
writer = sq_literal_writer_new (&err, writer);
if (writer == NULL)
error (1, 0, "sq_literal_writer_new: %s", sq_error_string (err));
size_t nread;
uint8_t buf[4096];
while ((nread = fread (buf, 1, sizeof buf, stdin)))
{
uint8_t *b = buf;
while (nread)
{
ssize_t written;
written = sq_writer_stack_write (&err, writer, b, nread);
if (written < 0)
error (1, 0, "sq_writer_stack_write: %s", sq_error_string (err));
b += written;
nread -= written;
}
}
rc = sq_writer_stack_finalize (&err, writer);
writer = NULL;
if (rc)
error (1, 0, "sq_writer_stack_write: %s", sq_error_string (err));
fwrite (cipher, 1, cipher_bytes, stdout);
munmap (b, st.st_size);
return 0;
}
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