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#include <stdio.h>
#include <errno.h>
#include <locale.h>
#include <gpgme.h>
#include "gpg.h"
#include "util.h"
#define fail_if_err(err) \
if (err) { \
fprintf(stderr, "%s:%d: %s: %s\n", __FILE__, __LINE__, \
gpgme_strsource(err), gpgme_strerror(err)); \
gpg_cleanup(); \
return 1; \
}
static gpgme_ctx_t ctx = NULL;
static gpgme_key_t key = NULL;
int gpg_init(void);
void gpg_cleanup(void);
int gpg_init(void)
{
gpgme_error_t err;
const char *local = setlocale(LC_ALL, "");
gpgme_check_version(NULL);
gpgme_set_locale(NULL, LC_CTYPE, local);
#ifdef LC_MESSAGES
gpgme_set_locale(NULL, LC_MESSAGES, local);
#endif
err = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
fail_if_err(err);
err = gpgme_new(&ctx);
fail_if_err(err);
return 0;
}
void gpg_cleanup(void)
{
if (ctx)
gpgme_key_release(key);
if (key)
gpgme_release(ctx);
}
int gpg_key_validate(const char *fpr)
{
int r;
gpgme_error_t err;
r = gpg_init();
if (r)
return r;
err = gpgme_get_key(ctx, fpr, &key, 1);
fail_if_err(err);
gpg_cleanup();
return 0;
}
int gpg_decrypt(const char *path, char *pass_out, size_t n)
{
int r;
gpgme_data_t in, out;
gpgme_error_t err;
r = gpg_init();
if (r)
return r;
err = gpgme_data_new_from_file(&in, path, 1);
fail_if_err(err);
err = gpgme_data_new(&out);
fail_if_err(err);
err = gpgme_op_decrypt(ctx, in, out);
fail_if_err(err);
r = gpgme_data_seek(out, 0, SEEK_SET);
if (r)
fail_if_err (gpgme_err_code_from_errno(errno));
r = gpgme_data_read(out, pass_out, n);
gpg_cleanup();
if (r < 0)
fail_if_err(gpgme_err_code_from_errno(errno));
// if (r) // TODO: upstream: did not return 0 despite eob
// err_die(r, "did not reach end of object");
return 0;
}
int gpg_encrypt(FILE *stream, const char *fpr, const char *pass, size_t n)
{
int r;
char buf[BUFSIZ];
gpgme_data_t in, out;
gpgme_error_t err;
r = gpg_init();
if (r)
return r;
err = gpgme_get_key(ctx, fpr, &key, 1);
fail_if_err(err);
err = gpgme_data_new_from_mem(&in, pass, n, 0);
fail_if_err(err);
err = gpgme_data_new(&out);
fail_if_err(err);
err = gpgme_op_encrypt(ctx, &key, GPGME_ENCRYPT_ALWAYS_TRUST, in, out);
fail_if_err(err);
r = gpgme_data_seek(out, 0, SEEK_SET);
if (r)
fail_if_err (gpgme_err_code_from_errno(errno));
while ((r = gpgme_data_read(out, buf, BUFSIZ)))
fwrite(buf, r, 1, stream);
gpg_cleanup();
if (r < 0)
fail_if_err(gpgme_err_code_from_errno(errno));
return 0;
}
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