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+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU General Public License is a free, copyleft license for
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+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
diff --git a/Makefile.am b/Makefile.am
new file mode 100644
index 0000000..4f54ea8
--- /dev/null
+++ b/Makefile.am
@@ -0,0 +1,27 @@
+# timelock -- timed release encryption utility
+
+# Copyright (C) 2017 Arun I <arunisaac@systemreboot.net>
+
+# This file is part of timelock.
+
+# timelock is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+
+# timelock is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+
+# You should have received a copy of the GNU General Public License
+# along with timelock.  If not, see <http://www.gnu.org/licenses/>.
+
+AM_CPPFLAGS = $(LIBGCRYPT_CFLAGS)
+AM_CFLAGS = -Wall -Wextra -Wpedantic
+LDADD = $(LIBGCRYPT_LIBS)
+
+bin_PROGRAMS = timelock
+timelock_SOURCES = timelock.c
+TESTS = test.sh
+EXTRA_DIST = README.org $(TESTS)
diff --git a/README.org b/README.org
new file mode 100644
index 0000000..f639eb1
--- /dev/null
+++ b/README.org
@@ -0,0 +1,8 @@
+timelock is a timed release encryption utility that encrypts files so
+that they can only be opened in the future.
+
+Cryptography has no notion of time. So, this is done by creating a
+computationally difficult problem (known as a timelock puzzle) whose
+solution is the secret key that was used to encrypt the message.
+
+http://theory.lcs.mit.edu/~rivest/RivestShamirWagner-timelock.ps
diff --git a/configure.ac b/configure.ac
new file mode 100644
index 0000000..d4040c1
--- /dev/null
+++ b/configure.ac
@@ -0,0 +1,41 @@
+dnl timelock -- timed release encryption utility
+
+dnl Copyright (C) 2017 Arun I <arunisaac@systemreboot.net>
+
+dnl This file is part of timelock.
+
+dnl timelock is free software: you can redistribute it and/or modify
+dnl it under the terms of the GNU General Public License as published by
+dnl the Free Software Foundation, either version 3 of the License, or
+dnl (at your option) any later version.
+
+dnl timelock is distributed in the hope that it will be useful,
+dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
+dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+dnl GNU General Public License for more details.
+
+dnl You should have received a copy of the GNU General Public License
+dnl along with timelock.  If not, see <http://www.gnu.org/licenses/>.
+
+dnl Initialize autoconf and automake
+AC_INIT(timelock, 0.1, arunisaac@systemreboot.net)
+AM_INIT_AUTOMAKE([foreign no-dist-gzip dist-xz])
+
+dnl Silence make
+AM_SILENT_RULES([yes])
+
+dnl Check for libm
+AC_CHECK_HEADERS(math.h, [], [AC_ERROR([math.h not found])])
+AC_SEARCH_LIBS(round, m, [], [AC_ERROR([libm not found])])
+
+dnl Check for libgcrypt
+AM_PATH_LIBGCRYPT
+
+dnl Check for boost preprocessor headers
+AC_CHECK_HEADERS(boost/preprocessor/seq.hpp, [], [AC_ERROR([Boost preprocessor headers not found])])
+
+dnl Config output headers
+AC_CONFIG_HEADERS([config.h])
+
+dnl Output Makefile
+AC_OUTPUT(Makefile)
diff --git a/timelock.c b/timelock.c
new file mode 100644
index 0000000..486082b
--- /dev/null
+++ b/timelock.c
@@ -0,0 +1,442 @@
+/* timelock -- timed release encryption utility
+
+   Copyright (C) 2017 Arun I <arunisaac@systemreboot.net>
+
+   This file is part of timelock.
+
+   timelock is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
+
+   timelock is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with timelock.  If not, see <http://www.gnu.org/licenses/>.  */
+
+// TODO: Implement in-place
+// TODO: Strengthen randomness
+
+#include <stdio.h>
+#include <math.h>
+#include <gcrypt.h>
+#include <inttypes.h>
+#include <time.h>
+#include <argp.h>
+#include <error.h>
+#include <boost/preprocessor/seq.hpp>
+#include "config.h"
+
+#define KEY_SIZE 32
+#define NONCE_SIZE 8
+#define READ_BUFFER_SIZE 1024
+
+#define PRIME_BITS 1024
+#define KEY_BITS (KEY_SIZE * 8)
+#define SQUARINGS_PER_ITERATION 1023
+#define TEST_ITERATIONS 10000
+
+#define DEFAULT_TIME 600
+
+// Magic bytes
+#define MAGIC_BYTES "timelock"
+// Output format version number
+#define OUTPUT_VERSION 0
+// Chunk types in output
+enum chunk_type {END_OF_CHUNKS, CHUNK_N, CHUNK_A, CHUNK_TIMES, CHUNK_CKEY};
+void print_parameter (enum chunk_type, gcry_mpi_t);
+// Cipher algorithms
+enum cipher_algo {SALSA20};
+
+#define _ALLOCATE_MPI(r, _, var) gcry_mpi_t var = gcry_mpi_new(1);
+#define ALLOCATE_MPI(mpi) BOOST_PP_SEQ_FOR_EACH(_ALLOCATE_MPI, _, mpi)
+#define _ALLOCATE_SECURE_MPI(r, _, var) gcry_mpi_t var = gcry_mpi_snew(1);
+#define ALLOCATE_SECURE_MPI(mpi) BOOST_PP_SEQ_FOR_EACH(_ALLOCATE_SECURE_MPI, _, mpi)
+#define _CLEANUP(r, _, var) _Generic((var), gcry_mpi_t: gcry_mpi_release, \
+				     gcry_cipher_hd_t: gcry_cipher_close, \
+				     default: free)(var);
+#define CLEANUP(vars) BOOST_PP_SEQ_FOR_EACH(_CLEANUP, _, vars)
+#define WITH_MPI(mpi, body) { ALLOCATE_MPI(mpi); body; CLEANUP(mpi); }
+
+#define TRY_CATCH_GCRYPT(try, message, handle) if (handle_gcrypt_error(try, message)) { handle; exit(1); }
+#define SAFE_FREAD(buffer, len, handle)		\
+  if (fread(buffer, 1, len, stdin) < len)		\
+    { handle; error(1, 0, "Incomplete input\n"); }
+#define SAFE_FWRITE(buffer, len, handle)			\
+  if (fwrite(buffer, 1, len, stdout) < len)			\
+    { handle; error(1, 0, "Error writing to standard output"); }
+#define SAFE_MALLOC(ptr, size, handle) if (!(ptr = malloc(size))) { handle; perror(__func__); exit(1); }
+#define SAFE_REALLOC(ptr, size, handle) if (!(ptr = realloc(ptr, size))) { handle; perror(__func__); exit(1); }
+
+// gcrypt helper functions
+gcry_mpi_t mpi_set_ulli (gcry_mpi_t, unsigned long long);
+unsigned long long mpi_to_ulli (gcry_mpi_t w);
+gcry_error_t generate_prime (gcry_mpi_t*);
+int handle_gcrypt_error (gcry_error_t, const char*);
+gcry_error_t open_cipher (gcry_cipher_hd_t* handle, const void *key, const unsigned char *nonce);
+
+size_t read_stdin (unsigned char**);
+void read_parameters (gcry_mpi_t* n, gcry_mpi_t* a, unsigned long long* times, gcry_mpi_t* ckey);
+void lock (unsigned long);
+void unlock (int);
+void info ();
+int create_puzzle (gcry_mpi_t, unsigned long long, gcry_mpi_t, gcry_mpi_t, gcry_mpi_t);
+void solve_puzzle (gcry_mpi_t, gcry_mpi_t, gcry_mpi_t, unsigned long long, gcry_mpi_t, int);
+double squarings_per_second ();
+
+const char* argp_program_version = PACKAGE_STRING;
+const char* argp_program_bug_address = PACKAGE_BUGREPORT;
+static char doc[] = "timelock -- encrypt files which can be opened only in the future";
+static char args_doc[] = "[lock|unlock]";
+
+static struct argp_option options[] = {
+  {"time", 't', "SECONDS", 0, "Time (in seconds) for which the input should be locked", 0},
+  {"quiet", 'q', 0, 0, "Don't produce any output", 0},
+  {"help", 'h', 0, 0, "Give this help list", 0},
+  {"usage", 1, 0, OPTION_HIDDEN, "Give a short usage message", 0},
+  { 0 }
+};
+
+struct arguments {
+  enum {LOCK, UNLOCK, INFO} command;
+  unsigned long seconds;
+  int quiet;
+  char* input_file;
+};
+
+static error_t parse_opt (int key, char *arg, struct argp_state *state)
+{
+  struct arguments *arguments = state->input;
+  switch (key) {
+  case 't':
+    sscanf(arg, "%lu", &arguments->seconds);
+    break;
+  case 'i':
+    arguments->input_file = arg;
+    break;
+  case 'q':
+    arguments->quiet = 1;
+    break;
+  case 'h':
+    argp_state_help(state, stderr, ARGP_HELP_STD_HELP);
+    break;
+  case 1:
+    argp_state_help(state, stderr, ARGP_HELP_STD_USAGE);
+    break;
+  case ARGP_KEY_ARG:
+    if (state->arg_num >= 1)
+      argp_usage(state);
+    if (!strcmp(arg, "lock"))
+      arguments->command = LOCK;
+    else if (!strcmp(arg, "unlock"))
+      arguments->command = UNLOCK;
+    else {
+      fprintf(stderr, "%s: Invalid command\n", arg);
+      argp_usage(state);
+      exit(1);
+    }
+    break;
+  case ARGP_KEY_END:
+    if (((arguments->command == UNLOCK) || (arguments->command == INFO)) && (arguments->seconds != 0)) {
+      fprintf(stderr, "-t|--times: Option only valid while locking\n");
+      argp_usage(state);
+      exit(1);
+    }
+    break;
+  default:
+    return ARGP_ERR_UNKNOWN;
+  }
+  return 0;
+}
+
+static struct argp argp = {options, parse_opt, args_doc, doc, NULL, NULL, NULL};
+
+int main (int argc, char *argv[])
+{
+  struct arguments arguments;
+  arguments.command = INFO;
+  arguments.seconds = 0;
+  arguments.input_file = "-";
+  arguments.quiet = 0;
+  argp_parse(&argp, argc, argv, ARGP_NO_HELP, 0, &arguments);
+
+  if (!gcry_check_version (GCRYPT_VERSION))
+    error(2, 0, "libgcrypt version mismatch\n");
+  gcry_control(GCRYCTL_SUSPEND_SECMEM_WARN);
+  gcry_control(GCRYCTL_INIT_SECMEM, 16384, 0);
+  gcry_control(GCRYCTL_RESUME_SECMEM_WARN);
+  gcry_control(GCRYCTL_INITIALIZATION_FINISHED, 0);
+
+  if (arguments.command == LOCK)
+    lock(arguments.seconds == 0 ? DEFAULT_TIME : arguments.seconds);
+  else if (arguments.command == UNLOCK) unlock(arguments.quiet != 1);
+  else if (arguments.command == INFO) info();
+  return 0;
+}
+
+size_t read_stdin (unsigned char **buffer)
+{
+  // Allocate memory for read buffer
+  SAFE_MALLOC(*buffer, READ_BUFFER_SIZE, return 0);
+  size_t bytes_read = 0;
+
+  // Read READ_BUFFER_SIZE bytes at a time
+  for (size_t size=READ_BUFFER_SIZE; ; size += READ_BUFFER_SIZE) {
+    size_t len = fread(*buffer + size - READ_BUFFER_SIZE, 1, READ_BUFFER_SIZE, stdin);
+    bytes_read += len;
+    if (len < READ_BUFFER_SIZE)
+      if (ferror(stdin)) {
+	perror(__func__);
+	CLEANUP((*buffer));
+	return 0;
+      }
+      else return bytes_read;
+    else SAFE_REALLOC(*buffer, size + READ_BUFFER_SIZE, return 0);
+  }
+}
+
+gcry_error_t generate_prime (gcry_mpi_t* p)
+{
+  return gcry_prime_generate(p, PRIME_BITS, 0, NULL, NULL, NULL, GCRY_WEAK_RANDOM, 0);
+}
+
+void print_parameter (enum chunk_type type, gcry_mpi_t param)
+{
+  unsigned char* buffer;
+  size_t nwritten;
+  gcry_mpi_aprint(GCRYMPI_FMT_PGP, &buffer, &nwritten, param);
+  SAFE_FWRITE(&type, 1, );
+  SAFE_FWRITE(buffer, nwritten, );
+  CLEANUP((buffer));
+}
+
+gcry_mpi_t mpi_set_ulli (gcry_mpi_t w, unsigned long long u)
+{
+  unsigned long long u_be = htobe64(u);
+  gcry_mpi_scan(&w, GCRYMPI_FMT_USG, &u_be, sizeof(u_be), NULL);
+  return w;
+}
+
+unsigned long long mpi_to_ulli (gcry_mpi_t w)
+{
+  unsigned long long u;
+  size_t nwritten;
+  gcry_mpi_print(GCRYMPI_FMT_USG, (unsigned char*)&u, sizeof(u), &nwritten, w);
+  u = be64toh(u) >> (sizeof(u) - nwritten)*8;
+  return u;
+}
+
+void lock (const unsigned long seconds)
+{
+  unsigned char key_bytes[KEY_SIZE];
+  WITH_MPI
+    ((n)(a)(times_mpi)(ckey)(key_mpi),
+     unsigned long long times = seconds * squarings_per_second();
+
+     // Create and output puzzle
+     if (create_puzzle(key_mpi, times, n, a, ckey)) {
+       CLEANUP((n)(a)(ckey)(key_mpi));
+       exit(1);
+     }
+     printf("%s%c", MAGIC_BYTES, OUTPUT_VERSION);
+     print_parameter(CHUNK_N, n);
+     print_parameter(CHUNK_A, a);
+     times_mpi = mpi_set_ulli(times_mpi, times);
+     print_parameter(CHUNK_TIMES, times_mpi);
+     print_parameter(CHUNK_CKEY, ckey);
+     printf("%c", END_OF_CHUNKS);
+     TRY_CATCH_GCRYPT(gcry_mpi_print(GCRYMPI_FMT_USG, key_bytes, KEY_SIZE, NULL, key_mpi),
+		      "Convert MPI key to bytes", CLEANUP((n)(a)(times_mpi)(ckey)(key_mpi))););
+
+  // Read plaintext of message
+  unsigned char* buffer;
+  size_t len = read_stdin(&buffer);
+  if (!len) exit(1);
+
+  // Generate and print nonce
+  unsigned char nonce[NONCE_SIZE];
+  gcry_create_nonce(nonce, NONCE_SIZE);
+  printf("%c", SALSA20);
+  SAFE_FWRITE(nonce, NONCE_SIZE, CLEANUP((buffer)));
+
+  // Write ciphertext of message
+  gcry_cipher_hd_t handle;
+  TRY_CATCH_GCRYPT(open_cipher(&handle, key_bytes, nonce),
+		   "Open cipher handle", CLEANUP((handle)(buffer)));
+  TRY_CATCH_GCRYPT(gcry_cipher_encrypt(handle, buffer, len, NULL, 0),
+		   "Encrypt message", CLEANUP((handle)(buffer)));
+  SAFE_FWRITE(buffer, len, CLEANUP((handle)(buffer)));
+
+  CLEANUP((handle)(buffer));
+}
+
+double squarings_per_second ()
+{
+  double squarings = 0;
+  WITH_MPI
+    ((n)(a)(ckey)(key),
+     if (create_puzzle(key, TEST_ITERATIONS, n, a, ckey)) {
+       CLEANUP((n)(a)(ckey)(key));
+       exit(1);
+     }
+     clock_t start = clock();
+     solve_puzzle(key, n, a, TEST_ITERATIONS, ckey, 0);
+     clock_t stop = clock();
+     squarings = CLOCKS_PER_SEC * TEST_ITERATIONS / ((double)(stop - start)););
+  return squarings;
+}
+
+void unlock (int progress)
+{
+  unsigned char key_bytes[KEY_SIZE];
+  unsigned long long times;
+  WITH_MPI
+    ((n)(a)(ckey)(key),
+     read_parameters(&n, &a, &times, &ckey);
+     solve_puzzle(key, n, a, times, ckey, progress);
+     TRY_CATCH_GCRYPT(gcry_mpi_print(GCRYMPI_FMT_USG, key_bytes, KEY_SIZE, NULL, key),
+		      "Convert MPI key to bytes", CLEANUP((n)(a)(ckey)(key))););
+
+  // Read nonce
+  enum cipher_algo cipher;
+  SAFE_FREAD(&cipher, 1, );
+  if ((uint8_t)cipher != SALSA20) {
+    error(1, 0, "Cipher algorithm not supported\n");
+    exit(1);
+  }
+  unsigned char nonce[NONCE_SIZE];
+  SAFE_FREAD(nonce, NONCE_SIZE, );
+
+  // Open cipher handle
+  gcry_cipher_hd_t handle;
+  TRY_CATCH_GCRYPT(open_cipher(&handle, key_bytes, nonce),
+		   "Open cipher handle", CLEANUP((handle)));
+
+  // Read stdin
+  unsigned char* buffer;
+  size_t len = read_stdin(&buffer);
+  if (!len) CLEANUP((handle));
+
+  // Decrypt
+  TRY_CATCH_GCRYPT(gcry_cipher_decrypt(handle, buffer, len, NULL, 0),
+		   "Decrypt message", CLEANUP((handle)(buffer)));
+  SAFE_FWRITE(buffer, len, );
+  CLEANUP((handle)(buffer));
+}
+
+int create_puzzle (const gcry_mpi_t key, const unsigned long long _times, gcry_mpi_t n, gcry_mpi_t a, gcry_mpi_t ckey)
+{
+  ALLOCATE_SECURE_MPI((p)(q)(phi)(two)(times));
+  times = mpi_set_ulli(times, _times);
+  two = mpi_set_ulli(two, 2);
+  int rv = 1;
+
+  // Primes p, q; n, phi and a
+  TRY_CATCH_GCRYPT((generate_prime(&p) || generate_prime(&q)), "Generate primes", goto cleanup);
+  gcry_mpi_mul(n, p, q);
+  gcry_mpi_sub_ui(p, p, 1);
+  gcry_mpi_sub_ui(q, q, 1);
+  gcry_mpi_mul(phi, p, q);
+  while (!((gcry_mpi_cmp_ui(a, 1) > 0) && (gcry_mpi_cmp(a, n) < 0)))
+    gcry_mpi_randomize(a, gcry_mpi_get_nbits(n), GCRY_WEAK_RANDOM);
+
+  // ciphertext of key
+  gcry_mpi_powm(ckey, two, times, phi);
+  gcry_mpi_powm(ckey, a, ckey, n);
+  while (!((gcry_mpi_cmp_ui(key, 1) > 0) && (gcry_mpi_cmp(key, n) < 0)))
+    gcry_mpi_randomize(key, KEY_BITS, GCRY_WEAK_RANDOM);
+  gcry_mpi_addm(ckey, key, ckey, n);
+  rv = 0;
+
+ cleanup:
+  CLEANUP((p)(q)(phi)(two)(times));
+  return rv;
+}
+
+void solve_puzzle (gcry_mpi_t key, const gcry_mpi_t n, const gcry_mpi_t a, const unsigned long long times, const gcry_mpi_t ckey, int progress)
+{
+  // Compute number of squarings
+  unsigned long long full = times / SQUARINGS_PER_ITERATION;
+  unsigned long long partial = times % SQUARINGS_PER_ITERATION;
+
+  // Perform squarings
+  gcry_mpi_set(key, a);
+  WITH_MPI
+    ((one)(exponent),
+     one = mpi_set_ulli(one, 1);
+     gcry_mpi_mul_2exp(exponent, one, SQUARINGS_PER_ITERATION);
+     for (unsigned long long i=0; i<full; i++) {
+       if (progress) fprintf(stderr, "\rProgress: %.2f%%", (100.0*i)/full);
+       gcry_mpi_powm(key, key, exponent, n);
+     }
+     gcry_mpi_mul_2exp(exponent, one, partial);
+     gcry_mpi_powm(key, key, exponent, n);
+     if (progress) fprintf(stderr, "\rProgress: 100.00%%\n");
+     gcry_mpi_subm(key, ckey, key, n););
+}
+
+gcry_error_t open_cipher (gcry_cipher_hd_t* handle, const void *key, const unsigned char *nonce)
+{
+  gcry_error_t err;
+  if (gcry_cipher_open(handle, GCRY_CIPHER_SALSA20, GCRY_CIPHER_MODE_STREAM, 0)) return err;
+  if (gcry_cipher_setkey(*handle, key, KEY_SIZE)) return err;
+  if (gcry_cipher_setiv(*handle, nonce, NONCE_SIZE)) return err;
+  return 0;
+}
+
+int handle_gcrypt_error (gcry_error_t err, const char* function)
+{
+  if (err) fprintf(stderr, "%s: %s/%s\n", function, gcry_strsource(err), gcry_strerror(err));
+  return err ? 1 : 0;
+}
+
+void info ()
+{
+  unsigned long long times;
+  double sps = squarings_per_second();
+  if (sps == 0) exit(1);
+  WITH_MPI
+    ((n)(a)(ckey),
+     read_parameters(&n, &a, &times, &ckey);
+     printf("n: %u bits\n", gcry_mpi_get_nbits(n));
+     printf("a: %u bits\n", gcry_mpi_get_nbits(a));
+     printf("squarings: %llu [ETA: %.0f second(s)]\n", times, round(times/sps));
+     printf("ckey: %u bits\n", gcry_mpi_get_nbits(ckey)););
+}
+
+void read_parameters (gcry_mpi_t* n, gcry_mpi_t* a, unsigned long long* times, gcry_mpi_t* ckey)
+{
+  unsigned char* buffer;
+  SAFE_MALLOC(buffer, strlen(MAGIC_BYTES) + 1, exit(1));
+  ALLOCATE_MPI((times_mpi));
+
+  // Check for magic bytes
+  buffer[strlen(MAGIC_BYTES)] = 0;
+  SAFE_FREAD(buffer, strlen(MAGIC_BYTES), );
+  if (!strstr((char*)buffer, MAGIC_BYTES))
+    error(1, 0, "Magic bytes missing. Input data is invalid.\n");
+
+  // Check for output version
+  uint8_t version = fgetc(stdin);
+  if (version > OUTPUT_VERSION)
+    error(1, 0, "Input data format version %d not supported. Please upgrade %s.\n", version, PACKAGE);
+
+  // Read parameters
+  enum chunk_type type;
+  gcry_mpi_t* params[] = {NULL, n, a, &times_mpi, ckey};
+  SAFE_REALLOC(buffer, 2, exit(1));
+  while ((type = fgetc(stdin))) {
+    SAFE_FREAD(buffer, 2, );
+    size_t len = be16toh(*(uint16_t*)buffer);
+    len = (len / 8) + (len % 8 ? 1 : 0);
+    SAFE_REALLOC(buffer, len + 2, exit(1));
+    SAFE_FREAD(buffer + 2, len, );
+    TRY_CATCH_GCRYPT(gcry_mpi_scan(params[type], GCRYMPI_FMT_PGP, buffer, len + 2, NULL),
+		     "Read parameter", exit(1));
+  }
+  *times = mpi_to_ulli(times_mpi);
+  CLEANUP((times_mpi)(buffer));
+}