Remove cryptography

As discussed in #694, vim encryption uses old,
obsolete algorithms that are poorly implemented.
Since insecure cryptography is worse than no
cryptgraphy, the community voted in favor of
removing all crypto.

Various alternatives to the old crypto is
being discussed in #701.

Closes #694.

1 files changed, 0 insertions, 237 deletions

diff --git a/src/nvim/crypt.c b/src/nvim/crypt.c
deleted file mode 100644
index 2eb699d84e..0000000000
--- a/src/nvim/crypt.c
+++ /dev/null
@@ -1,237 +0,0 @@
-// Optional encryption support.
-// Mohsin Ahmed, mosh@sasi.com, 98-09-24
-// Based on zip/crypt sources.
-//
-// NOTE FOR USA: Since 2000 exporting this code from the USA is allowed to
-// most countries. There are a few exceptions, but that still should not be a
-// problem since this code was originally created in Europe and India.
-//
-// Blowfish addition originally made by Mohsin Ahmed,
-// http://www.cs.albany.edu/~mosh 2010-03-14
-// Based on blowfish by Bruce Schneier (http://www.schneier.com/blowfish.html)
-// and sha256 by Christophe Devine.
-
-#include "nvim/vim.h"
-#include "nvim/misc2.h"
-#include "nvim/blowfish.h"
-#include "nvim/ex_getln.h"
-#include "nvim/message.h"
-#include "nvim/option.h"
-#include "nvim/strings.h"
-
-static void make_crc_tab(void);
-
-static uint32_t crc_32_tab[256];
-
-// Fills the CRC table.
-static void make_crc_tab(void)
-{
-  uint32_t s;
-  uint32_t t;
-  uint32_t v;
-  static bool done = false;
-
-  if (done) {
-    return;
-  }
-
-  for (t = 0; t < 256; t++) {
-    v = t;
-
-    for (s = 0; s < 8; s++) {
-      v = (v >> 1) ^ ((v & 1) * (uint32_t)0xedb88320L);
-    }
-    crc_32_tab[t] = v;
-  }
-  done = true;
-}
-
-#define CRC32(c, b) (crc_32_tab[((int)(c) ^ (b)) & 0xff] ^ ((c) >> 8))
-
-static uint32_t keys[3]; // keys defining the pseudo-random sequence
-
-// Returns the next byte in the pseudo-random sequence.
-#define DECRYPT_BYTE_ZIP(t) { \
-  uint16_t temp; \
-  temp = (uint16_t)keys[2] | 2; \
-  t = (int)(((unsigned)(temp * (temp ^ 1U)) >> 8) & 0xff); \
-}
-
-// Updates the encryption keys with the next byte of plain text.
-#define UPDATE_KEYS_ZIP(c) { \
-  keys[0] = CRC32(keys[0], (c)); \
-  keys[1] += keys[0] & 0xff; \
-  keys[1] = keys[1] * 134775813L + 1; \
-  keys[2] = CRC32(keys[2], (int)(keys[1] >> 24)); \
-}
-
-static int crypt_busy = 0;
-static uint32_t saved_keys[3];
-static int saved_crypt_method;
-
-int crypt_method_from_string(char_u *s)
-{
-  return *s == 'b' ? 1 : 0;
-}
-
-int get_crypt_method(buf_T *buf)
-{
-  return crypt_method_from_string(*buf->b_p_cm == NUL ? p_cm : buf->b_p_cm);
-}
-
-void set_crypt_method(buf_T *buf, int method)
-{
-  free_string_option(buf->b_p_cm);
-  buf->b_p_cm = vim_strsave((char_u *)(method == 0 ? "zip" : "blowfish"));
-}
-
-void crypt_push_state(void)
-{
-  if (crypt_busy == 1) {
-    // Save the state
-    if (use_crypt_method == 0) {
-      saved_keys[0] = keys[0];
-      saved_keys[1] = keys[1];
-      saved_keys[2] = keys[2];
-    } else {
-      bf_crypt_save();
-    }
-    saved_crypt_method = use_crypt_method;
-  } else if (crypt_busy > 1) {
-    EMSG2(_(e_intern2), "crypt_push_state()");
-  }
-  crypt_busy++;
-}
-
-void crypt_pop_state(void)
-{
-  crypt_busy--;
-
-  if (crypt_busy == 1) {
-    use_crypt_method = saved_crypt_method;
-
-    if (use_crypt_method == 0) {
-      keys[0] = saved_keys[0];
-      keys[1] = saved_keys[1];
-      keys[2] = saved_keys[2];
-    } else {
-      bf_crypt_restore();
-    }
-  }
-}
-
-void crypt_encode(char_u *from, size_t len, char_u *to)
-{
-  size_t i;
-  int ztemp;
-  int t;
-
-  if (use_crypt_method == 0) {
-    for (i = 0; i < len; i++) {
-      ztemp = from[i];
-      DECRYPT_BYTE_ZIP(t);
-      UPDATE_KEYS_ZIP(ztemp);
-      to[i] = t ^ ztemp;
-    }
-  } else {
-    bf_crypt_encode(from, len, to);
-  }
-}
-
-void crypt_decode(char_u *ptr, long len)
-{
-  char_u *p;
-
-  if (use_crypt_method == 0) {
-    for (p = ptr; p < ptr + len; p++) {
-      uint16_t temp;
-
-      temp = (uint16_t)keys[2] | 2;
-      temp = (int)(((unsigned)(temp * (temp ^ 1U)) >> 8) & 0xff);
-      UPDATE_KEYS_ZIP(*p ^= temp);
-    }
-  } else {
-    bf_crypt_decode(ptr, len);
-  }
-}
-
-void crypt_init_keys(char_u *passwd)
-{
-  if ((passwd != NULL) && (*passwd != NUL)) {
-    if (use_crypt_method == 0) {
-      char_u *p;
-
-      make_crc_tab();
-      keys[0] = 305419896L;
-      keys[1] = 591751049L;
-      keys[2] = 878082192L;
-
-      for (p = passwd; *p != NUL; p++) {
-        UPDATE_KEYS_ZIP((int)*p);
-      }
-    } else {
-      bf_crypt_init_keys(passwd);
-    }
-  }
-}
-
-void free_crypt_key(char_u *key)
-{
-  char_u *p;
-
-  if (key != NULL) {
-    for (p = key; *p != NUL; p++) {
-      *p = 0;
-    }
-    free(key);
-  }
-}
-
-char_u *get_crypt_key(int store, int twice)
-{
-  char_u *p1;
-  char_u *p2 = NULL;
-  int round;
-
-  for (round = 0;; round++) {
-    cmdline_star = TRUE;
-    cmdline_row = msg_row;
-    char_u *prompt = (round == 0)
-        ? (char_u *) _("Enter encryption key: ")
-        : (char_u *) _("Enter same key again: ");
-    p1 = getcmdline_prompt(NUL, prompt, 0, EXPAND_NOTHING, NULL);
-    cmdline_star = FALSE;
-    if (p1 == NULL) {
-      break;
-    }
-
-    if (round == twice) {
-      if ((p2 != NULL) && (STRCMP(p1, p2) != 0)) {
-        MSG(_("Keys don't match!"));
-        free_crypt_key(p1);
-        free_crypt_key(p2);
-        p2 = NULL;
-        round = -1; // Do it again
-        continue;
-      }
-
-      if (store) {
-        set_option_value((char_u *) "key", 0L, p1, OPT_LOCAL);
-        free_crypt_key(p1);
-        p1 = curbuf->b_p_key;
-      }
-      break;
-    }
-    p2 = p1;
-  }
-
-  // Since the user typed this, no need to wait for return.
-  if (msg_didout) {
-    msg_putchar('\n');
-  }
-  need_wait_return = FALSE;
-  msg_didout = FALSE;
-
-  free_crypt_key(p2);
-  return p1;
-}