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/* This example demonstrates how to use the low-level interface to
encrypt a file. */
#define _GNU_SOURCE
/* Roughly glibc compatible error reporting. */
#define error(S, E, F, ...) do { \
fprintf (stderr, (F), __VA_ARGS__); \
int s = (S), e = (E); \
if (e) { fprintf (stderr, ": %s", strerror (e)); } \
fprintf (stderr, "\n"); \
fflush (stderr); \
if (s) { exit (s); } \
} while (0)
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sequoia/openpgp.h>
int
main (int argc, char **argv)
{
pgp_status_t rc;
pgp_error_t err;
int use_armor = 1;
pgp_tpk_t tpk;
pgp_writer_t sink;
pgp_writer_stack_t writer = NULL;
if (argc != 2)
error (1, 0, "Usage: %s <keyfile> <plain >cipher", argv[0]);
tpk = pgp_tpk_from_file (&err, argv[1]);
if (tpk == NULL)
error (1, 0, "pgp_tpk_from_file: %s", pgp_error_to_string (err));
pgp_tpk_key_iter_t iter = pgp_tpk_key_iter_valid (tpk);
pgp_tpk_key_iter_encrypting_capable_at_rest (iter);
pgp_tpk_key_iter_encrypting_capable_for_transport (iter);
size_t recipients_len;
pgp_recipient_t *recipients =
pgp_recipients_from_key_iter (iter, &recipients_len);
sink = pgp_writer_from_fd (STDOUT_FILENO);
if (use_armor)
sink = pgp_armor_writer_new (&err, sink, PGP_ARMOR_KIND_MESSAGE,
NULL, 0);
writer = pgp_writer_stack_message (sink);
writer = pgp_encryptor_new (&err,
writer,
NULL, 0, /* no passwords */
recipients, recipients_len,
9 /* AES256 */,
0 /* No AEAD */);
if (writer == NULL)
error (1, 0, "pgp_encryptor_new: %s", pgp_error_to_string (err));
writer = pgp_literal_writer_new (&err, writer);
if (writer == NULL)
error (1, 0, "pgp_literal_writer_new: %s", pgp_error_to_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 = pgp_writer_stack_write (&err, writer, b, nread);
if (written < 0)
error (1, 0, "pgp_writer_stack_write: %s", pgp_error_to_string (err));
b += written;
nread -= written;
}
}
rc = pgp_writer_stack_finalize (&err, writer);
writer = NULL;
if (rc)
error (1, 0, "pgp_writer_stack_write: %s", pgp_error_to_string (err));
for (size_t i = 0; i < recipients_len; i++)
pgp_recipient_free (recipients[i]);
free (recipients);
pgp_tpk_free (tpk);
return 0;
}
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