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crypt.c
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crypt.c
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/* vi:set ts=8 sts=4 sw=4 noet:
*
* VIM - Vi IMproved by Bram Moolenaar
*
* Do ":help uganda" in Vim to read copying and usage conditions.
* Do ":help credits" in Vim to see a list of people who contributed.
* See README.txt for an overview of the Vim source code.
*/
/*
* crypt.c: Generic encryption support.
*/
#include "vim.h"
#if defined(FEAT_CRYPT) || defined(PROTO)
/*
* Optional encryption support.
* Mohsin Ahmed, mosh@sasi.com, 1998-09-24
* Based on zip/crypt sources.
* Refactored by David Leadbeater, 2014.
*
* 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* Blowfish addition originally made by Mohsin Ahmed,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.
*/
typedef struct {
char *name; // encryption name as used in 'cryptmethod'
char *magic; // magic bytes stored in file header
int salt_len; // length of salt, or 0 when not using salt
int seed_len; // length of seed, or 0 when not using seed
int add_len; // additional length in the header needed for storing
// custom data
#ifdef CRYPT_NOT_INPLACE
int works_inplace; // encryption/decryption can be done in-place
#endif
int whole_undofile; // whole undo file is encrypted
// Optional function pointer for a self-test.
int (*self_test_fn)(void);
// Function pointer for initializing encryption/decryption.
int (* init_fn)(cryptstate_T *state, char_u *key, crypt_arg_T *arg);
// Function pointers for encoding/decoding from one buffer into another.
// Optional, however, these or the _buffer ones should be configured.
void (*encode_fn)(cryptstate_T *state, char_u *from, size_t len,
char_u *to, int last);
void (*decode_fn)(cryptstate_T *state, char_u *from, size_t len,
char_u *to, int last);
// Function pointers for encoding and decoding, can buffer data if needed.
// Optional (however, these or the above should be configured).
long (*encode_buffer_fn)(cryptstate_T *state, char_u *from, size_t len,
char_u **newptr, int last);
long (*decode_buffer_fn)(cryptstate_T *state, char_u *from, size_t len,
char_u **newptr, int last);
// Function pointers for in-place encoding and decoding, used for
// crypt_*_inplace(). "from" and "to" arguments will be equal.
// These may be the same as decode_fn and encode_fn above, however an
// algorithm may implement them in a way that is not interchangeable with
// the crypt_(en|de)code() interface (for example because it wishes to add
// padding to files).
// This method is used for swap and undo files which have a rigid format.
void (*encode_inplace_fn)(cryptstate_T *state, char_u *p1, size_t len,
char_u *p2, int last);
void (*decode_inplace_fn)(cryptstate_T *state, char_u *p1, size_t len,
char_u *p2, int last);
} cryptmethod_T;
static int crypt_sodium_init_(cryptstate_T *state, char_u *key, crypt_arg_T *arg);
static long crypt_sodium_buffer_decode(cryptstate_T *state, char_u *from, size_t len, char_u **buf_out, int last);
static long crypt_sodium_buffer_encode(cryptstate_T *state, char_u *from, size_t len, char_u **buf_out, int last);
# if defined(FEAT_SODIUM) || defined(PROTO)
static void crypt_long_long_to_char(long long n, char_u *s);
static void crypt_int_to_char(int n, char_u *s);
static long long crypt_char_to_long_long(char_u *s);
static int crypt_char_to_int(char_u *s);
#endif
#if defined(FEAT_EVAL) && defined(FEAT_SODIUM)
static void crypt_sodium_report_hash_params(unsigned long long opslimit, unsigned long long ops_def, size_t memlimit, size_t mem_def, int alg, int alg_def);
#endif
// index is method_nr of cryptstate_T, CRYPT_M_*
static cryptmethod_T cryptmethods[CRYPT_M_COUNT] = {
// PK_Zip; very weak
{
"zip",
"VimCrypt~01!",
0,
0,
0,
#ifdef CRYPT_NOT_INPLACE
TRUE,
#endif
FALSE,
NULL,
crypt_zip_init,
crypt_zip_encode, crypt_zip_decode,
NULL, NULL,
crypt_zip_encode, crypt_zip_decode,
},
// Blowfish/CFB + SHA-256 custom key derivation; implementation issues.
{
"blowfish",
"VimCrypt~02!",
8,
8,
0,
#ifdef CRYPT_NOT_INPLACE
TRUE,
#endif
FALSE,
blowfish_self_test,
crypt_blowfish_init,
crypt_blowfish_encode, crypt_blowfish_decode,
NULL, NULL,
crypt_blowfish_encode, crypt_blowfish_decode,
},
// Blowfish/CFB + SHA-256 custom key derivation; fixed.
{
"blowfish2",
"VimCrypt~03!",
8,
8,
0,
#ifdef CRYPT_NOT_INPLACE
TRUE,
#endif
TRUE,
blowfish_self_test,
crypt_blowfish_init,
crypt_blowfish_encode, crypt_blowfish_decode,
NULL, NULL,
crypt_blowfish_encode, crypt_blowfish_decode,
},
// XChaCha20 using libsodium; implementation issues
{
"xchacha20",
"VimCrypt~04!",
#ifdef FEAT_SODIUM
crypto_pwhash_argon2id_SALTBYTES, // 16
#else
16,
#endif
8,
0,
#ifdef CRYPT_NOT_INPLACE
FALSE,
#endif
FALSE,
NULL,
crypt_sodium_init_,
NULL, NULL,
crypt_sodium_buffer_encode, crypt_sodium_buffer_decode,
NULL, NULL,
},
// XChaCha20 using libsodium; stores parameters in header
{
"xchacha20v2",
"VimCrypt~05!",
#ifdef FEAT_SODIUM
crypto_pwhash_argon2id_SALTBYTES, // 16
#else
16,
#endif
8,
// sizeof(crypto_pwhash_OPSLIMIT_INTERACTIVE + crypto_pwhash_MEMLIMIT_INTERACTIVE + crypto_pwhash_ALG_DEFAULT)
20,
#ifdef CRYPT_NOT_INPLACE
FALSE,
#endif
FALSE,
NULL,
crypt_sodium_init_,
NULL, NULL,
crypt_sodium_buffer_encode, crypt_sodium_buffer_decode,
NULL, NULL,
},
// NOTE: when adding a new method, use some random bytes for the magic key,
// to avoid that a text file is recognized as encrypted.
};
#if defined(FEAT_SODIUM) || defined(PROTO)
typedef struct {
size_t count;
unsigned char key[crypto_box_SEEDBYTES];
// 32, same as crypto_secretstream_xchacha20poly1305_KEYBYTES
crypto_secretstream_xchacha20poly1305_state
state;
} sodium_state_T;
# ifdef DYNAMIC_SODIUM
# ifdef MSWIN
# define SODIUM_PROC FARPROC
# define load_dll vimLoadLib
# define symbol_from_dll GetProcAddress
# define close_dll FreeLibrary
# define load_dll_error GetWin32Error
# else
# error Dynamic loading of libsodium is not supported for now.
//# define HINSTANCE void*
//# define SODIUM_PROC void*
//# define load_dll(n) dlopen((n), RTLD_LAZY|RTLD_GLOBAL)
//# define symbol_from_dll dlsym
//# define close_dll dlclose
//# define load_dll_error dlerror
# endif
# define sodium_init load_sodium
# define sodium_free dll_sodium_free
# define sodium_malloc dll_sodium_malloc
# define sodium_memzero dll_sodium_memzero
# define sodium_mlock dll_sodium_mlock
# define sodium_munlock dll_sodium_munlock
# define crypto_secretstream_xchacha20poly1305_init_push \
dll_crypto_secretstream_xchacha20poly1305_init_push
# define crypto_secretstream_xchacha20poly1305_push \
dll_crypto_secretstream_xchacha20poly1305_push
# define crypto_secretstream_xchacha20poly1305_init_pull \
dll_crypto_secretstream_xchacha20poly1305_init_pull
# define crypto_secretstream_xchacha20poly1305_pull \
dll_crypto_secretstream_xchacha20poly1305_pull
# define crypto_pwhash dll_crypto_pwhash
# define randombytes_buf dll_randombytes_buf
# define randombytes_random dll_randombytes_random
static int (*dll_sodium_init)(void) = NULL;
static void (*dll_sodium_free)(void *) = NULL;
static void *(*dll_sodium_malloc)(const size_t) = NULL;
static void (*dll_sodium_memzero)(void * const, const size_t) = NULL;
static int (*dll_sodium_mlock)(void * const, const size_t) = NULL;
static int (*dll_sodium_munlock)(void * const, const size_t) = NULL;
static int (*dll_crypto_secretstream_xchacha20poly1305_init_push)
(crypto_secretstream_xchacha20poly1305_state *state,
unsigned char [],
const unsigned char []) = NULL;
static int (*dll_crypto_secretstream_xchacha20poly1305_push)
(crypto_secretstream_xchacha20poly1305_state *state,
unsigned char *c, unsigned long long *clen_p,
const unsigned char *m, unsigned long long mlen,
const unsigned char *ad, unsigned long long adlen, unsigned char tag)
= NULL;
static int (*dll_crypto_secretstream_xchacha20poly1305_init_pull)
(crypto_secretstream_xchacha20poly1305_state *state,
const unsigned char [],
const unsigned char []) = NULL;
static int (*dll_crypto_secretstream_xchacha20poly1305_pull)
(crypto_secretstream_xchacha20poly1305_state *state,
unsigned char *m, unsigned long long *mlen_p, unsigned char *tag_p,
const unsigned char *c, unsigned long long clen,
const unsigned char *ad, unsigned long long adlen) = NULL;
static int (*dll_crypto_pwhash)(unsigned char * const out,
unsigned long long outlen,
const char * const passwd, unsigned long long passwdlen,
const unsigned char * const salt,
unsigned long long opslimit, size_t memlimit, int alg)
= NULL;
static void (*dll_randombytes_buf)(void * const buf, const size_t size);
static uint32_t (*dll_randombytes_random)(void);
static struct {
const char *name;
SODIUM_PROC *ptr;
} sodium_funcname_table[] = {
{"sodium_init", (SODIUM_PROC*)&dll_sodium_init},
{"sodium_free", (SODIUM_PROC*)&dll_sodium_free},
{"sodium_malloc", (SODIUM_PROC*)&dll_sodium_malloc},
{"sodium_memzero", (SODIUM_PROC*)&dll_sodium_memzero},
{"sodium_mlock", (SODIUM_PROC*)&dll_sodium_mlock},
{"sodium_munlock", (SODIUM_PROC*)&dll_sodium_munlock},
{"crypto_secretstream_xchacha20poly1305_init_push", (SODIUM_PROC*)&dll_crypto_secretstream_xchacha20poly1305_init_push},
{"crypto_secretstream_xchacha20poly1305_push", (SODIUM_PROC*)&dll_crypto_secretstream_xchacha20poly1305_push},
{"crypto_secretstream_xchacha20poly1305_init_pull", (SODIUM_PROC*)&dll_crypto_secretstream_xchacha20poly1305_init_pull},
{"crypto_secretstream_xchacha20poly1305_pull", (SODIUM_PROC*)&dll_crypto_secretstream_xchacha20poly1305_pull},
{"crypto_pwhash", (SODIUM_PROC*)&dll_crypto_pwhash},
{"randombytes_buf", (SODIUM_PROC*)&dll_randombytes_buf},
{"randombytes_random", (SODIUM_PROC*)&dll_randombytes_random},
{NULL, NULL}
};
static int
sodium_runtime_link_init(int verbose)
{
static HINSTANCE hsodium = NULL;
const char *libname = DYNAMIC_SODIUM_DLL;
int i;
if (hsodium != NULL)
return OK;
hsodium = load_dll(libname);
if (hsodium == NULL)
{
if (verbose)
semsg(_(e_could_not_load_library_str_str), libname, load_dll_error());
return FAIL;
}
for (i = 0; sodium_funcname_table[i].ptr; ++i)
{
if ((*sodium_funcname_table[i].ptr = symbol_from_dll(hsodium,
sodium_funcname_table[i].name)) == NULL)
{
close_dll(hsodium);
hsodium = NULL;
if (verbose)
semsg(_(e_could_not_load_library_function_str), sodium_funcname_table[i].name);
return FAIL;
}
}
return OK;
}
static int
load_sodium(void)
{
if (sodium_runtime_link_init(TRUE) == FAIL)
return -1;
return dll_sodium_init();
}
# endif
# if defined(DYNAMIC_SODIUM) || defined(PROTO)
int
sodium_enabled(int verbose)
{
return sodium_runtime_link_init(verbose) == OK;
}
# endif
#endif
#define CRYPT_MAGIC_LEN 12 // cannot change
static char crypt_magic_head[] = "VimCrypt~";
/*
* Return int value for crypt method name.
* 0 for "zip", the old method. Also for any non-valid value.
* 1 for "blowfish".
* 2 for "blowfish2".
*/
int
crypt_method_nr_from_name(char_u *name)
{
int i;
for (i = 0; i < CRYPT_M_COUNT; ++i)
if (STRCMP(name, cryptmethods[i].name) == 0)
return i;
return 0;
}
/*
* Get the crypt method used for a file from "ptr[len]", the magic text at the
* start of the file.
* Returns -1 when no encryption used.
*/
int
crypt_method_nr_from_magic(char *ptr, int len)
{
int i;
if (len < CRYPT_MAGIC_LEN)
return -1;
for (i = 0; i < CRYPT_M_COUNT; i++)
if (memcmp(ptr, cryptmethods[i].magic, CRYPT_MAGIC_LEN) == 0)
return i;
i = (int)STRLEN(crypt_magic_head);
if (len >= i && memcmp(ptr, crypt_magic_head, i) == 0)
emsg(_(e_file_is_encrypted_with_unknown_method));
return -1;
}
#ifdef CRYPT_NOT_INPLACE
/*
* Return TRUE if the crypt method for "method_nr" can be done in-place.
*/
int
crypt_works_inplace(cryptstate_T *state)
{
return cryptmethods[state->method_nr].works_inplace;
}
#endif
/*
* Get the crypt method for buffer "buf" as a number.
*/
int
crypt_get_method_nr(buf_T *buf)
{
return crypt_method_nr_from_name(*buf->b_p_cm == NUL ? p_cm : buf->b_p_cm);
}
/*
* Returns True for Sodium Encryption.
*/
int
crypt_method_is_sodium(int method)
{
return method == CRYPT_M_SOD || method == CRYPT_M_SOD2;
}
/*
* Return TRUE when the buffer uses an encryption method that encrypts the
* whole undo file, not only the text.
*/
int
crypt_whole_undofile(int method_nr)
{
return cryptmethods[method_nr].whole_undofile;
}
/*
* Get crypt method specific length of the file header in bytes.
*/
int
crypt_get_header_len(int method_nr)
{
return CRYPT_MAGIC_LEN
+ cryptmethods[method_nr].salt_len
+ cryptmethods[method_nr].seed_len
+ cryptmethods[method_nr].add_len;
}
#if defined(FEAT_SODIUM) || defined(PROTO)
/*
* Get maximum crypt method specific length of the file header in bytes.
*/
int
crypt_get_max_header_len(void)
{
int i;
int max = 0;
int temp = 0;
for (i = 0; i < CRYPT_M_COUNT; ++i)
{
temp = crypt_get_header_len(i);
if (temp > max)
max = temp;
}
return max;
}
#endif
/*
* Set the crypt method for buffer "buf" to "method_nr" using the int value as
* returned by crypt_method_nr_from_name().
*/
void
crypt_set_cm_option(buf_T *buf, int method_nr)
{
free_string_option(buf->b_p_cm);
buf->b_p_cm = vim_strsave((char_u *)cryptmethods[method_nr].name);
}
/*
* If the crypt method for the current buffer has a self-test, run it and
* return OK/FAIL.
*/
int
crypt_self_test(void)
{
int method_nr = crypt_get_method_nr(curbuf);
if (cryptmethods[method_nr].self_test_fn == NULL)
return OK;
return cryptmethods[method_nr].self_test_fn();
}
/*
* Allocate a crypt state and initialize it.
* Return NULL for failure.
*/
cryptstate_T *
crypt_create(
int method_nr,
char_u *key,
crypt_arg_T *crypt_arg)
{
cryptstate_T *state = ALLOC_ONE(cryptstate_T);
if (state == NULL)
return state;
state->method_nr = method_nr;
if (cryptmethods[method_nr].init_fn(state, key, crypt_arg) == FAIL)
{
vim_free(state);
return NULL;
}
return state;
}
/*
* Allocate a crypt state from a file header and initialize it.
* Assumes that header contains at least the number of bytes that
* crypt_get_header_len() returns for "method_nr".
*/
cryptstate_T *
crypt_create_from_header(
int method_nr,
char_u *key,
char_u *header)
{
crypt_arg_T arg;
CLEAR_FIELD(arg);
arg.cat_init_from_file = TRUE;
arg.cat_salt_len = cryptmethods[method_nr].salt_len;
arg.cat_seed_len = cryptmethods[method_nr].seed_len;
arg.cat_add_len = cryptmethods[method_nr].add_len;
if (arg.cat_salt_len > 0)
arg.cat_salt = header + CRYPT_MAGIC_LEN;
if (arg.cat_seed_len > 0)
arg.cat_seed = header + CRYPT_MAGIC_LEN + arg.cat_salt_len;
if (arg.cat_add_len > 0)
arg.cat_add = header + CRYPT_MAGIC_LEN
+ arg.cat_salt_len + arg.cat_seed_len;
return crypt_create(method_nr, key, &arg);
}
/*
* Read the crypt method specific header data from "fp".
* Return an allocated cryptstate_T or NULL on error.
*/
cryptstate_T *
crypt_create_from_file(FILE *fp, char_u *key)
{
int method_nr;
int header_len;
char magic_buffer[CRYPT_MAGIC_LEN];
char_u *buffer;
cryptstate_T *state;
if (fread(magic_buffer, CRYPT_MAGIC_LEN, 1, fp) != 1)
return NULL;
method_nr = crypt_method_nr_from_magic(magic_buffer, CRYPT_MAGIC_LEN);
if (method_nr < 0)
return NULL;
header_len = crypt_get_header_len(method_nr);
if ((buffer = alloc(header_len)) == NULL)
return NULL;
mch_memmove(buffer, magic_buffer, CRYPT_MAGIC_LEN);
if (header_len > CRYPT_MAGIC_LEN
&& fread(buffer + CRYPT_MAGIC_LEN,
header_len - CRYPT_MAGIC_LEN, 1, fp) != 1)
{
vim_free(buffer);
return NULL;
}
state = crypt_create_from_header(method_nr, key, buffer);
vim_free(buffer);
return state;
}
/*
* Allocate a cryptstate_T for writing and initialize it with "key".
* Allocates and fills in the header and stores it in "header", setting
* "header_len". The header may include salt and seed, depending on
* cryptmethod. Caller must free header.
* Returns the state or NULL on failure.
*/
cryptstate_T *
crypt_create_for_writing(
int method_nr,
char_u *key,
char_u **header,
int *header_len)
{
int len = crypt_get_header_len(method_nr);
crypt_arg_T arg;
cryptstate_T *state;
CLEAR_FIELD(arg);
arg.cat_salt_len = cryptmethods[method_nr].salt_len;
arg.cat_seed_len = cryptmethods[method_nr].seed_len;
arg.cat_add_len = cryptmethods[method_nr].add_len;
arg.cat_init_from_file = FALSE;
*header_len = len;
*header = alloc(len);
if (*header == NULL)
return NULL;
mch_memmove(*header, cryptmethods[method_nr].magic, CRYPT_MAGIC_LEN);
if (arg.cat_salt_len > 0 || arg.cat_seed_len > 0 || arg.cat_add_len > 0)
{
if (arg.cat_salt_len > 0)
arg.cat_salt = *header + CRYPT_MAGIC_LEN;
if (arg.cat_seed_len > 0)
arg.cat_seed = *header + CRYPT_MAGIC_LEN + arg.cat_salt_len;
if (arg.cat_add_len > 0)
arg.cat_add = *header + CRYPT_MAGIC_LEN
+ arg.cat_salt_len + arg.cat_seed_len;
// TODO: Should this be crypt method specific? (Probably not worth
// it). sha2_seed is pretty bad for large amounts of entropy, so make
// that into something which is suitable for anything.
#ifdef FEAT_SODIUM
if (sodium_init() >= 0)
{
if (arg.cat_salt_len > 0)
randombytes_buf(arg.cat_salt, arg.cat_salt_len);
if (arg.cat_seed_len > 0)
randombytes_buf(arg.cat_seed, arg.cat_seed_len);
}
else
#endif
sha2_seed(arg.cat_salt, arg.cat_salt_len, arg.cat_seed, arg.cat_seed_len);
}
state = crypt_create(method_nr, key, &arg);
if (state == NULL)
VIM_CLEAR(*header);
return state;
}
/*
* Free the crypt state.
*/
void
crypt_free_state(cryptstate_T *state)
{
#ifdef FEAT_SODIUM
if (crypt_method_is_sodium(state->method_nr))
{
sodium_munlock(((sodium_state_T *)state->method_state)->key,
crypto_box_SEEDBYTES);
sodium_memzero(state->method_state, sizeof(sodium_state_T));
sodium_free(state->method_state);
}
else
#endif
vim_free(state->method_state);
vim_free(state);
}
#ifdef CRYPT_NOT_INPLACE
/*
* Encode "from[len]" and store the result in a newly allocated buffer, which
* is stored in "newptr".
* Return number of bytes in "newptr", 0 for need more or -1 on error.
*/
long
crypt_encode_alloc(
cryptstate_T *state,
char_u *from,
size_t len,
char_u **newptr,
int last)
{
cryptmethod_T *method = &cryptmethods[state->method_nr];
if (method->encode_buffer_fn != NULL)
// Has buffer function, pass through.
return method->encode_buffer_fn(state, from, len, newptr, last);
if (len == 0)
// Not buffering, just return EOF.
return (long)len;
*newptr = alloc(len + 50);
if (*newptr == NULL)
return -1;
method->encode_fn(state, from, len, *newptr, last);
return (long)len;
}
/*
* Decrypt "ptr[len]" and store the result in a newly allocated buffer, which
* is stored in "newptr".
* Return number of bytes in "newptr", 0 for need more or -1 on error.
*/
long
crypt_decode_alloc(
cryptstate_T *state,
char_u *ptr,
long len,
char_u **newptr,
int last)
{
cryptmethod_T *method = &cryptmethods[state->method_nr];
if (method->decode_buffer_fn != NULL)
// Has buffer function, pass through.
return method->decode_buffer_fn(state, ptr, len, newptr, last);
if (len == 0)
// Not buffering, just return EOF.
return len;
*newptr = alloc(len);
if (*newptr == NULL)
return -1;
method->decode_fn(state, ptr, len, *newptr, last);
return len;
}
#endif
/*
* Encrypting "from[len]" into "to[len]".
*/
void
crypt_encode(
cryptstate_T *state,
char_u *from,
size_t len,
char_u *to,
int last)
{
cryptmethods[state->method_nr].encode_fn(state, from, len, to, last);
}
#if 0 // unused
/*
* decrypting "from[len]" into "to[len]".
*/
void
crypt_decode(
cryptstate_T *state,
char_u *from,
size_t len,
char_u *to,
int last)
{
cryptmethods[state->method_nr].decode_fn(state, from, len, to, last);
}
#endif
/*
* Simple inplace encryption, modifies "buf[len]" in place.
*/
void
crypt_encode_inplace(
cryptstate_T *state,
char_u *buf,
size_t len,
int last)
{
cryptmethods[state->method_nr].encode_inplace_fn(state, buf, len,
buf, last);
}
/*
* Simple inplace decryption, modifies "buf[len]" in place.
*/
void
crypt_decode_inplace(
cryptstate_T *state,
char_u *buf,
size_t len,
int last)
{
cryptmethods[state->method_nr].decode_inplace_fn(state, buf, len,
buf, last);
}
/*
* Free an allocated crypt key. Clear the text to make sure it doesn't stay
* in memory anywhere.
*/
void
crypt_free_key(char_u *key)
{
char_u *p;
if (key != NULL)
{
for (p = key; *p != NUL; ++p)
*p = 0;
vim_free(key);
}
}
/*
* Check the crypt method and give a warning if it's outdated.
*/
void
crypt_check_method(int method)
{
if (method < CRYPT_M_BF2 || method == CRYPT_M_SOD)
{
msg_scroll = TRUE;
msg(_("Warning: Using a weak encryption method; see :help 'cm'"));
}
}
/*
* If the crypt method for "curbuf" does not support encrypting the swap file
* then disable the swap file.
*/
void
crypt_check_swapfile_curbuf(void)
{
#ifdef FEAT_SODIUM
int method = crypt_get_method_nr(curbuf);
if (crypt_method_is_sodium(method))
{
// encryption uses padding and MAC, that does not work very well with
// swap and undo files, so disable them
mf_close_file(curbuf, TRUE); // remove the swap file
set_option_value_give_err((char_u *)"swf", 0, NULL, OPT_LOCAL);
msg_scroll = TRUE;
msg(_("Note: Encryption of swapfile not supported, disabling swap file"));
}
#endif
}
void
crypt_check_current_method(void)
{
crypt_check_method(crypt_get_method_nr(curbuf));
}
/*
* Ask the user for a crypt key.
* When "store" is TRUE, the new key is stored in the 'key' option, and the
* 'key' option value is returned: Don't free it.
* When "store" is FALSE, the typed key is returned in allocated memory.
* Returns NULL on failure.
*/
char_u *
crypt_get_key(
int store,
int twice) // Ask for the key twice.
{
char_u *p1, *p2 = NULL;
int round;
for (round = 0; ; ++round)
{
cmdline_star = TRUE;
cmdline_row = msg_row;
p1 = getcmdline_prompt(NUL, round == 0
? (char_u *)_("Enter encryption key: ")
: (char_u *)_("Enter same key again: "), 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!"));
crypt_free_key(p1);
crypt_free_key(p2);
p2 = NULL;
round = -1; // do it again
continue;
}
if (store)
{
set_option_value_give_err((char_u *)"key", 0L, p1, OPT_LOCAL);
crypt_free_key(p1);
p1 = curbuf->b_p_key;
crypt_check_swapfile_curbuf();
}
break;
}
p2 = p1;
}
// since the user typed this, no need to wait for return
if (!crypt_method_is_sodium(crypt_get_method_nr(curbuf)))
{
if (msg_didout)
msg_putchar('\n');
need_wait_return = FALSE;
msg_didout = FALSE;
}
crypt_free_key(p2);
return p1;
}
/*
* Append a message to IObuff for the encryption/decryption method being used.
*/
void
crypt_append_msg(
buf_T *buf)
{
if (crypt_get_method_nr(buf) == 0)
STRCAT(IObuff, _("[crypted]"));
else
{
STRCAT(IObuff, "[");
STRCAT(IObuff, *buf->b_p_cm == NUL ? p_cm : buf->b_p_cm);
STRCAT(IObuff, "]");
}
}
static int
crypt_sodium_init_(
cryptstate_T *state UNUSED,
char_u *key UNUSED,
crypt_arg_T *arg UNUSED)
{
# ifdef FEAT_SODIUM
// crypto_box_SEEDBYTES == crypto_secretstream_xchacha20poly1305_KEYBYTES
unsigned char dkey[crypto_box_SEEDBYTES]; // 32
sodium_state_T *sd_state;
int retval = 0;
unsigned long long opslimit;
unsigned long long memlimit;
int alg;
if (sodium_init() < 0)
return FAIL;
sd_state = (sodium_state_T *)sodium_malloc(sizeof(sodium_state_T));
sodium_memzero(sd_state, sizeof(sodium_state_T));
if ((state->method_nr == CRYPT_M_SOD2 && !arg->cat_init_from_file)
|| state->method_nr == CRYPT_M_SOD)
{
opslimit = crypto_pwhash_OPSLIMIT_INTERACTIVE;
memlimit = crypto_pwhash_MEMLIMIT_INTERACTIVE;
alg = crypto_pwhash_ALG_DEFAULT;
#if 0
// For testing
if (state->method_nr == CRYPT_M_SOD2)
{
opslimit = crypto_pwhash_OPSLIMIT_MODERATE;
memlimit = crypto_pwhash_MEMLIMIT_MODERATE;
}
#endif
// derive a key from the password
if (crypto_pwhash(dkey, sizeof(dkey), (const char *)key, STRLEN(key),
arg->cat_salt, opslimit, (size_t)memlimit, alg) != 0)
{
// out of memory
sodium_free(sd_state);
return FAIL;
}
memcpy(sd_state->key, dkey, crypto_box_SEEDBYTES);
retval += sodium_mlock(sd_state->key, crypto_box_SEEDBYTES);
retval += sodium_mlock(key, STRLEN(key));
if (retval < 0)
{
emsg(_(e_encryption_sodium_mlock_failed));
sodium_free(sd_state);
return FAIL;
}
// "cat_add" should not be NULL, check anyway for safety
if (state->method_nr == CRYPT_M_SOD2 && arg->cat_add != NULL)
{
char_u buffer[20];
char_u *p = buffer;
vim_memset(buffer, 0, 20);
crypt_long_long_to_char(opslimit, p);
p += sizeof(opslimit);
crypt_long_long_to_char(memlimit, p);
p += sizeof(memlimit);
crypt_int_to_char(alg, p);
memcpy(arg->cat_add, buffer, sizeof(opslimit) + sizeof(memlimit) + sizeof(alg));
}
}
else
{
char_u buffer[20];
char_u *p = buffer;
vim_memset(buffer, 0, 20);
int size = sizeof(opslimit) +
sizeof(memlimit) + sizeof(alg);
// Reading parameters from file
if (arg->cat_add_len < size)
{
sodium_free(sd_state);