[openssh.git] / authfile.c

/*

authfile.c

Author: Tatu Ylonen <ylo@cs.hut.fi>

Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
                   All rights reserved

Created: Mon Mar 27 03:52:05 1995 ylo

This file contains functions for reading and writing identity files, and
for reading the passphrase from the user.

*/

#include "includes.h"
RCSID("$Id$");

#ifdef HAVE_OPENSSL
#include <openssl/bn.h>
#endif
#ifdef HAVE_SSL
#include <ssl/bn.h>
#endif

#include "xmalloc.h"
#include "buffer.h"
#include "bufaux.h"
#include "cipher.h"
#include "ssh.h"

/* Version identification string for identity files. */
#define AUTHFILE_ID_STRING "SSH PRIVATE KEY FILE FORMAT 1.1\n"

/* Saves the authentication (private) key in a file, encrypting it with
   passphrase.  The identification of the file (lowest 64 bits of n)
   will precede the key to provide identification of the key without
   needing a passphrase. */

int
save_private_key(const char *filename, const char *passphrase,
		 RSA *key, const char *comment)
{
  Buffer buffer, encrypted;
  char buf[100], *cp;
  int f, i;
  CipherContext cipher;
  int cipher_type;
  u_int32_t rand;

  /* If the passphrase is empty, use SSH_CIPHER_NONE to ease converting to
     another cipher; otherwise use SSH_AUTHFILE_CIPHER. */
  if (strcmp(passphrase, "") == 0)
    cipher_type = SSH_CIPHER_NONE;
  else
    cipher_type = SSH_AUTHFILE_CIPHER;

  /* This buffer is used to built the secret part of the private key. */
  buffer_init(&buffer);
  
  /* Put checkbytes for checking passphrase validity. */
  rand = arc4random();
  buf[0] = rand & 0xff;
  buf[1] = (rand >> 8) & 0xff;
  buf[2] = buf[0];
  buf[3] = buf[1];
  buffer_append(&buffer, buf, 4);

  /* Store the private key (n and e will not be stored because they will
     be stored in plain text, and storing them also in encrypted format
     would just give known plaintext). */
  buffer_put_bignum(&buffer, key->d);
  buffer_put_bignum(&buffer, key->iqmp);
  buffer_put_bignum(&buffer, key->q); /* reverse from SSL p */
  buffer_put_bignum(&buffer, key->p); /* reverse from SSL q */

  /* Pad the part to be encrypted until its size is a multiple of 8. */
  while (buffer_len(&buffer) % 8 != 0)
    buffer_put_char(&buffer, 0);

  /* This buffer will be used to contain the data in the file. */
  buffer_init(&encrypted);

  /* First store keyfile id string. */
  cp = AUTHFILE_ID_STRING;
  for (i = 0; cp[i]; i++)
    buffer_put_char(&encrypted, cp[i]);
  buffer_put_char(&encrypted, 0);

  /* Store cipher type. */
  buffer_put_char(&encrypted, cipher_type);
  buffer_put_int(&encrypted, 0);  /* For future extension */

  /* Store public key.  This will be in plain text. */
  buffer_put_int(&encrypted, BN_num_bits(key->n));
  buffer_put_bignum(&encrypted, key->n);
  buffer_put_bignum(&encrypted, key->e);
  buffer_put_string(&encrypted, comment, strlen(comment));

  /* Allocate space for the private part of the key in the buffer. */
  buffer_append_space(&encrypted, &cp, buffer_len(&buffer));

  cipher_set_key_string(&cipher, cipher_type, passphrase, 1);
  cipher_encrypt(&cipher, (unsigned char *)cp, 
		 (unsigned char *)buffer_ptr(&buffer),
		 buffer_len(&buffer));
  memset(&cipher, 0, sizeof(cipher));

  /* Destroy temporary data. */
  memset(buf, 0, sizeof(buf));
  buffer_free(&buffer);

  /* Write to a file. */
  f = open(filename, O_WRONLY|O_CREAT|O_TRUNC, 0600);
  if (f < 0)
    return 0;

  if (write(f, buffer_ptr(&encrypted), buffer_len(&encrypted)) != 
      buffer_len(&encrypted))
    {
      debug("Write to key file %.200s failed: %.100s", filename,
	    strerror(errno));
      buffer_free(&encrypted);
      close(f);
      remove(filename);
      return 0;
    }
  close(f);
  buffer_free(&encrypted);
  return 1;
}

/* Loads the public part of the key file.  Returns 0 if an error
   was encountered (the file does not exist or is not readable), and
   non-zero otherwise. */

int
load_public_key(const char *filename, RSA *pub, 
		char **comment_return)
{
  int f, i;
  off_t len;
  Buffer buffer;
  char *cp;

  /* Read data from the file into the buffer. */
  f = open(filename, O_RDONLY);
  if (f < 0)
    return 0;

  len = lseek(f, (off_t)0, SEEK_END);
  lseek(f, (off_t)0, SEEK_SET);
  
  buffer_init(&buffer);
  buffer_append_space(&buffer, &cp, len);

  if (read(f, cp, (size_t)len) != (size_t)len)
    {
      debug("Read from key file %.200s failed: %.100s", filename, 
	    strerror(errno));
      buffer_free(&buffer);
      close(f);
      return 0;
    }
  close(f);

  /* Check that it is at least big enought to contain the ID string. */
  if (len < strlen(AUTHFILE_ID_STRING) + 1)
    {
      debug("Bad key file %.200s.", filename);
      buffer_free(&buffer);
      return 0;
    }

  /* Make sure it begins with the id string.  Consume the id string from
     the buffer. */
  for (i = 0; i < (unsigned int)strlen(AUTHFILE_ID_STRING) + 1; i++)
    if (buffer_get_char(&buffer) != (unsigned char)AUTHFILE_ID_STRING[i])
      {
	debug("Bad key file %.200s.", filename);
	buffer_free(&buffer);
	return 0;
      }

  /* Skip cipher type and reserved data. */
  (void)buffer_get_char(&buffer); /* cipher type */
  (void)buffer_get_int(&buffer); /* reserved */

  /* Read the public key from the buffer. */
  buffer_get_int(&buffer);
  pub->n = BN_new();
  buffer_get_bignum(&buffer, pub->n);
  pub->e = BN_new();
  buffer_get_bignum(&buffer, pub->e);
  if (comment_return)
    *comment_return = buffer_get_string(&buffer, NULL);
  /* The encrypted private part is not parsed by this function. */

  buffer_free(&buffer);
  
  return 1;
}

/* Loads the private key from the file.  Returns 0 if an error is encountered
   (file does not exist or is not readable, or passphrase is bad).
   This initializes the private key. */

int
load_private_key(const char *filename, const char *passphrase,
		 RSA *prv, char **comment_return)
{
  int f, i, check1, check2, cipher_type;
  off_t len;
  Buffer buffer, decrypted;
  char *cp;
  CipherContext cipher;
  BN_CTX *ctx;
  BIGNUM *aux;
  struct stat st;

  /* Read the file into the buffer. */
  f = open(filename, O_RDONLY);
  if (f < 0)
    return 0;

  /* We assume we are called under uid of the owner of the file */
  if (fstat(f, &st) < 0 ||
      (st.st_uid != 0 && st.st_uid != getuid()) ||
      (st.st_mode & 077) != 0) {
    error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
    error("@         WARNING: UNPROTECTED PRIVATE KEY FILE!          @");
    error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
    error("Bad ownership or mode(0%3.3o) for '%s'.",
	   st.st_mode & 0777, filename);
    error("It is recommended that your private key files are NOT accessible by others.");
    return 0;
  }

  len = lseek(f, (off_t)0, SEEK_END);
  lseek(f, (off_t)0, SEEK_SET);
  
  buffer_init(&buffer);
  buffer_append_space(&buffer, &cp, len);

  if (read(f, cp, (size_t)len) != (size_t)len)
    {
      debug("Read from key file %.200s failed: %.100s", filename,
	    strerror(errno));
      buffer_free(&buffer);
      close(f);
      return 0;
    }
  close(f);

  /* Check that it is at least big enought to contain the ID string. */
  if (len < strlen(AUTHFILE_ID_STRING) + 1)
    {
      debug("Bad key file %.200s.", filename);
      buffer_free(&buffer);
      return 0;
    }

  /* Make sure it begins with the id string.  Consume the id string from
     the buffer. */
  for (i = 0; i < (unsigned int)strlen(AUTHFILE_ID_STRING) + 1; i++)
    if (buffer_get_char(&buffer) != (unsigned char)AUTHFILE_ID_STRING[i])
      {
	debug("Bad key file %.200s.", filename);
	buffer_free(&buffer);
	return 0;
      }

  /* Read cipher type. */
  cipher_type = buffer_get_char(&buffer);
  (void)buffer_get_int(&buffer);  /* Reserved data. */

  /* Read the public key from the buffer. */
  buffer_get_int(&buffer);
  prv->n = BN_new();
  buffer_get_bignum(&buffer, prv->n);
  prv->e = BN_new();
  buffer_get_bignum(&buffer, prv->e);
  if (comment_return)
    *comment_return = buffer_get_string(&buffer, NULL);
  else
    xfree(buffer_get_string(&buffer, NULL));

  /* Check that it is a supported cipher. */
  if (((cipher_mask() | SSH_CIPHER_NONE | SSH_AUTHFILE_CIPHER) &
	(1 << cipher_type)) == 0)
    {
      debug("Unsupported cipher %.100s used in key file %.200s.",
	    cipher_name(cipher_type), filename);
      buffer_free(&buffer);
      goto fail;
    }

  /* Initialize space for decrypted data. */
  buffer_init(&decrypted);
  buffer_append_space(&decrypted, &cp, buffer_len(&buffer));
      
  /* Rest of the buffer is encrypted.  Decrypt it using the passphrase. */
  cipher_set_key_string(&cipher, cipher_type, passphrase, 0);
  cipher_decrypt(&cipher, (unsigned char *)cp,
		 (unsigned char *)buffer_ptr(&buffer),
		 buffer_len(&buffer));

  buffer_free(&buffer);

  check1 = buffer_get_char(&decrypted);
  check2 = buffer_get_char(&decrypted);
  if (check1 != buffer_get_char(&decrypted) ||
      check2 != buffer_get_char(&decrypted))
    {
      if (strcmp(passphrase, "") != 0)
	debug("Bad passphrase supplied for key file %.200s.", filename);
      /* Bad passphrase. */
      buffer_free(&decrypted);
    fail:
      BN_clear_free(prv->n);
      BN_clear_free(prv->e);
      if (comment_return)
	xfree(*comment_return);
      return 0;
    }

  /* Read the rest of the private key. */
  prv->d = BN_new();
  buffer_get_bignum(&decrypted, prv->d);
  prv->iqmp = BN_new();
  buffer_get_bignum(&decrypted, prv->iqmp); /* u */
  /* in SSL and SSH p and q are exchanged */
  prv->q = BN_new();
  buffer_get_bignum(&decrypted, prv->q); /* p */
  prv->p = BN_new();
  buffer_get_bignum(&decrypted, prv->p); /* q */

  ctx = BN_CTX_new();
  aux = BN_new();

  BN_sub(aux, prv->q, BN_value_one());
  prv->dmq1 = BN_new();
  BN_mod(prv->dmq1, prv->d, aux, ctx);

  BN_sub(aux, prv->p, BN_value_one());
  prv->dmp1 = BN_new();
  BN_mod(prv->dmp1, prv->d, aux, ctx);

  BN_clear_free(aux);
  BN_CTX_free(ctx);
  
  buffer_free(&decrypted);

  return 1;
}
Commit	Line	Data
8efc0c15	1	/*
	2
	3	authfile.c
	4
	5	Author: Tatu Ylonen <ylo@cs.hut.fi>
	6
	7	Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
	8	All rights reserved
	9
	10	Created: Mon Mar 27 03:52:05 1995 ylo
	11
	12	This file contains functions for reading and writing identity files, and
	13	for reading the passphrase from the user.
	14
	15	*/
	16
	17	#include "includes.h"
	18	RCSID("$Id$");
	19
5881cd60	20	#ifdef HAVE_OPENSSL
8efc0c15	21	#include <openssl/bn.h>
5881cd60	22	#endif
	23	#ifdef HAVE_SSL
	24	#include <ssl/bn.h>
	25	#endif
	26
8efc0c15	27	#include "xmalloc.h"
	28	#include "buffer.h"
	29	#include "bufaux.h"
	30	#include "cipher.h"
	31	#include "ssh.h"
	32
	33	/* Version identification string for identity files. */
	34	#define AUTHFILE_ID_STRING "SSH PRIVATE KEY FILE FORMAT 1.1\n"
	35
	36	/* Saves the authentication (private) key in a file, encrypting it with
	37	passphrase. The identification of the file (lowest 64 bits of n)
	38	will precede the key to provide identification of the key without
	39	needing a passphrase. */
	40
	41	int
	42	save_private_key(const char filename, const char passphrase,
	43	RSA key, const char comment)
	44	{
	45	Buffer buffer, encrypted;
	46	char buf[100], *cp;
	47	int f, i;
	48	CipherContext cipher;
	49	int cipher_type;
	50	u_int32_t rand;
	51
	52	/* If the passphrase is empty, use SSH_CIPHER_NONE to ease converting to
	53	another cipher; otherwise use SSH_AUTHFILE_CIPHER. */
	54	if (strcmp(passphrase, "") == 0)
	55	cipher_type = SSH_CIPHER_NONE;
	56	else
	57	cipher_type = SSH_AUTHFILE_CIPHER;
	58
	59	/* This buffer is used to built the secret part of the private key. */
	60	buffer_init(&buffer);
	61
	62	/* Put checkbytes for checking passphrase validity. */
	63	rand = arc4random();
	64	buf[0] = rand & 0xff;
	65	buf[1] = (rand >> 8) & 0xff;
	66	buf[2] = buf[0];
	67	buf[3] = buf[1];
	68	buffer_append(&buffer, buf, 4);
	69
	70	/* Store the private key (n and e will not be stored because they will
	71	be stored in plain text, and storing them also in encrypted format
	72	would just give known plaintext). */
	73	buffer_put_bignum(&buffer, key->d);
	74	buffer_put_bignum(&buffer, key->iqmp);
	75	buffer_put_bignum(&buffer, key->q); /* reverse from SSL p */
	76	buffer_put_bignum(&buffer, key->p); /* reverse from SSL q */
	77
	78	/* Pad the part to be encrypted until its size is a multiple of 8. */
	79	while (buffer_len(&buffer) % 8 != 0)
	80	buffer_put_char(&buffer, 0);
	81
	82	/* This buffer will be used to contain the data in the file. */
	83	buffer_init(&encrypted);
	84
	85	/* First store keyfile id string. */
	86	cp = AUTHFILE_ID_STRING;
	87	for (i = 0; cp[i]; i++)
	88	buffer_put_char(&encrypted, cp[i]);
	89	buffer_put_char(&encrypted, 0);
	90
91	/* Store cipher type. */
92	buffer_put_char(&encrypted, cipher_type);
93	buffer_put_int(&encrypted, 0); /* For future extension */
94
95	/* Store public key. This will be in plain text. */
96	buffer_put_int(&encrypted, BN_num_bits(key->n));
97	buffer_put_bignum(&encrypted, key->n);
98	buffer_put_bignum(&encrypted, key->e);
99	buffer_put_string(&encrypted, comment, strlen(comment));
100
101	/* Allocate space for the private part of the key in the buffer. */
102	buffer_append_space(&encrypted, &cp, buffer_len(&buffer));
103
104	cipher_set_key_string(&cipher, cipher_type, passphrase, 1);
105	cipher_encrypt(&cipher, (unsigned char *)cp,
106	(unsigned char *)buffer_ptr(&buffer),
107	buffer_len(&buffer));
108	memset(&cipher, 0, sizeof(cipher));
109
110	/* Destroy temporary data. */
111	memset(buf, 0, sizeof(buf));
112	buffer_free(&buffer);
113
114	/* Write to a file. */
115	f = open(filename, O_WRONLY\|O_CREAT\|O_TRUNC, 0600);
116	if (f < 0)
117	return 0;
118
119	if (write(f, buffer_ptr(&encrypted), buffer_len(&encrypted)) !=
120	buffer_len(&encrypted))
121	{
122	debug("Write to key file %.200s failed: %.100s", filename,
123	strerror(errno));
124	buffer_free(&encrypted);
125	close(f);
126	remove(filename);
127	return 0;
128	}
129	close(f);
130	buffer_free(&encrypted);
131	return 1;
132	}
133
134	/* Loads the public part of the key file. Returns 0 if an error
135	was encountered (the file does not exist or is not readable), and
136	non-zero otherwise. */
137
138	int
139	load_public_key(const char filename, RSA pub,
140	char **comment_return)
141	{
142	int f, i;
143	off_t len;
144	Buffer buffer;
145	char *cp;
146
147	/* Read data from the file into the buffer. */
148	f = open(filename, O_RDONLY);
149	if (f < 0)
150	return 0;
151
152	len = lseek(f, (off_t)0, SEEK_END);
153	lseek(f, (off_t)0, SEEK_SET);
154
155	buffer_init(&buffer);
156	buffer_append_space(&buffer, &cp, len);
157
158	if (read(f, cp, (size_t)len) != (size_t)len)
159	{
160	debug("Read from key file %.200s failed: %.100s", filename,
161	strerror(errno));
162	buffer_free(&buffer);
163	close(f);
164	return 0;
165	}
166	close(f);
167
168	/* Check that it is at least big enought to contain the ID string. */
169	if (len < strlen(AUTHFILE_ID_STRING) + 1)
170	{
171	debug("Bad key file %.200s.", filename);
172	buffer_free(&buffer);
173	return 0;
174	}
175
176	/* Make sure it begins with the id string. Consume the id string from
177	the buffer. */
178	for (i = 0; i < (unsigned int)strlen(AUTHFILE_ID_STRING) + 1; i++)
179	if (buffer_get_char(&buffer) != (unsigned char)AUTHFILE_ID_STRING[i])
180	{
181	debug("Bad key file %.200s.", filename);
182	buffer_free(&buffer);
183	return 0;
184	}
185
186	/* Skip cipher type and reserved data. */
187	(void)buffer_get_char(&buffer); /* cipher type */
188	(void)buffer_get_int(&buffer); /* reserved */
189
190	/* Read the public key from the buffer. */
191	buffer_get_int(&buffer);
192	pub->n = BN_new();
193	buffer_get_bignum(&buffer, pub->n);
194	pub->e = BN_new();
195	buffer_get_bignum(&buffer, pub->e);
196	if (comment_return)
197	*comment_return = buffer_get_string(&buffer, NULL);
198	/* The encrypted private part is not parsed by this function. */
199
200	buffer_free(&buffer);
201
202	return 1;
203	}
204
205	/* Loads the private key from the file. Returns 0 if an error is encountered
206	(file does not exist or is not readable, or passphrase is bad).
207	This initializes the private key. */
208
209	int
210	load_private_key(const char filename, const char passphrase,
211	RSA prv, char *comment_return)
212	{
213	int f, i, check1, check2, cipher_type;
214	off_t len;
215	Buffer buffer, decrypted;
216	char *cp;
217	CipherContext cipher;
218	BN_CTX *ctx;
219	BIGNUM *aux;
220	struct stat st;
221
222	/* Read the file into the buffer. */
223	f = open(filename, O_RDONLY);
224	if (f < 0)
225	return 0;
226
227	/* We assume we are called under uid of the owner of the file */
228	if (fstat(f, &st) < 0 \|\|
229	(st.st_uid != 0 && st.st_uid != getuid()) \|\|
230	(st.st_mode & 077) != 0) {
231	error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
232	error("@ WARNING: UNPROTECTED PRIVATE KEY FILE! @");
233	error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@");
234	error("Bad ownership or mode(0%3.3o) for '%s'.",
235	st.st_mode & 0777, filename);
236	error("It is recommended that your private key files are NOT accessible by others.");
237	return 0;
238	}
239
240	len = lseek(f, (off_t)0, SEEK_END);
241	lseek(f, (off_t)0, SEEK_SET);
242
243	buffer_init(&buffer);
244	buffer_append_space(&buffer, &cp, len);
245
246	if (read(f, cp, (size_t)len) != (size_t)len)
247	{
248	debug("Read from key file %.200s failed: %.100s", filename,
249	strerror(errno));
250	buffer_free(&buffer);
251	close(f);
252	return 0;
253	}
254	close(f);
255
256	/* Check that it is at least big enought to contain the ID string. */
257	if (len < strlen(AUTHFILE_ID_STRING) + 1)
258	{
259	debug("Bad key file %.200s.", filename);
260	buffer_free(&buffer);
261	return 0;
262	}
263
264	/* Make sure it begins with the id string. Consume the id string from
265	the buffer. */
266	for (i = 0; i < (unsigned int)strlen(AUTHFILE_ID_STRING) + 1; i++)
267	if (buffer_get_char(&buffer) != (unsigned char)AUTHFILE_ID_STRING[i])
268	{
269	debug("Bad key file %.200s.", filename);
270	buffer_free(&buffer);
271	return 0;
272	}
273
274	/* Read cipher type. */
275	cipher_type = buffer_get_char(&buffer);
276	(void)buffer_get_int(&buffer); /* Reserved data. */
277
278	/* Read the public key from the buffer. */
279	buffer_get_int(&buffer);
280	prv->n = BN_new();
281	buffer_get_bignum(&buffer, prv->n);
282	prv->e = BN_new();
283	buffer_get_bignum(&buffer, prv->e);
284	if (comment_return)
285	*comment_return = buffer_get_string(&buffer, NULL);
286	else
287	xfree(buffer_get_string(&buffer, NULL));
288
289	/* Check that it is a supported cipher. */
290	if (((cipher_mask() \| SSH_CIPHER_NONE \| SSH_AUTHFILE_CIPHER) &
291	(1 << cipher_type)) == 0)
292	{
293	debug("Unsupported cipher %.100s used in key file %.200s.",
294	cipher_name(cipher_type), filename);
295	buffer_free(&buffer);
296	goto fail;
297	}
298
299	/* Initialize space for decrypted data. */
300	buffer_init(&decrypted);
301	buffer_append_space(&decrypted, &cp, buffer_len(&buffer));
302
303	/* Rest of the buffer is encrypted. Decrypt it using the passphrase. */
304	cipher_set_key_string(&cipher, cipher_type, passphrase, 0);
305	cipher_decrypt(&cipher, (unsigned char *)cp,
306	(unsigned char *)buffer_ptr(&buffer),
307	buffer_len(&buffer));
308
309	buffer_free(&buffer);
310
311	check1 = buffer_get_char(&decrypted);
312	check2 = buffer_get_char(&decrypted);
313	if (check1 != buffer_get_char(&decrypted) \|\|
314	check2 != buffer_get_char(&decrypted))
315	{
316	if (strcmp(passphrase, "") != 0)
317	debug("Bad passphrase supplied for key file %.200s.", filename);
318	/* Bad passphrase. */
319	buffer_free(&decrypted);
320	fail:
321	BN_clear_free(prv->n);
322	BN_clear_free(prv->e);
323	if (comment_return)
324	xfree(*comment_return);
325	return 0;
326	}
327
328	/* Read the rest of the private key. */
329	prv->d = BN_new();
330	buffer_get_bignum(&decrypted, prv->d);
331	prv->iqmp = BN_new();
332	buffer_get_bignum(&decrypted, prv->iqmp); /* u */
333	/* in SSL and SSH p and q are exchanged */
334	prv->q = BN_new();
335	buffer_get_bignum(&decrypted, prv->q); /* p */
336	prv->p = BN_new();
337	buffer_get_bignum(&decrypted, prv->p); /* q */
338
339	ctx = BN_CTX_new();
340	aux = BN_new();
341
342	BN_sub(aux, prv->q, BN_value_one());
343	prv->dmq1 = BN_new();
344	BN_mod(prv->dmq1, prv->d, aux, ctx);
345
346	BN_sub(aux, prv->p, BN_value_one());
347	prv->dmp1 = BN_new();
348	BN_mod(prv->dmp1, prv->d, aux, ctx);
349
350	BN_clear_free(aux);
351	BN_CTX_free(ctx);
352
353	buffer_free(&decrypted);
354
355	return 1;
356	}