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path: root/pwmanager/libcrypt/cipher/cipher.c
authorzautrix <zautrix>2004-10-19 20:16:14 (UTC)
committer zautrix <zautrix>2004-10-19 20:16:14 (UTC)
commiteca49bb06a71980ef61d078904573f25890fc7f2 (patch) (side-by-side diff)
treec5338e3b12430248979a9ac2c1c7e6646ea9ecdf /pwmanager/libcrypt/cipher/cipher.c
parent53cc32b6e7b1f672bf91b2baf2df6c1e8baf3e0a (diff)
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Initial revision
Diffstat (limited to 'pwmanager/libcrypt/cipher/cipher.c') (more/less context) (ignore whitespace changes)
-rw-r--r--pwmanager/libcrypt/cipher/cipher.c1391
1 files changed, 1391 insertions, 0 deletions
diff --git a/pwmanager/libcrypt/cipher/cipher.c b/pwmanager/libcrypt/cipher/cipher.c
new file mode 100644
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--- a/dev/null
+++ b/pwmanager/libcrypt/cipher/cipher.c
@@ -0,0 +1,1391 @@
+/* cipher.c - cipher dispatcher
+ * Copyright (C) 1998,1999,2000,2001,2002,2003 Free Software Foundation, Inc.
+ *
+ * This file is part of Libgcrypt.
+ *
+ * Libgcrypt is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser general Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * Libgcrypt 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
+ */
+
+#include <config.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <assert.h>
+
+#include "g10lib.h"
+#include "cipher.h"
+#include "ath.h"
+
+#define MAX_BLOCKSIZE 16
+#define TABLE_SIZE 14
+#define CTX_MAGIC_NORMAL 0x24091964
+#define CTX_MAGIC_SECURE 0x46919042
+
+/* This is the list of the default ciphers, which are included in
+ libgcrypt. */
+static struct cipher_table_entry
+{
+ gcry_cipher_spec_t *cipher;
+ unsigned int algorithm;
+} cipher_table[] =
+ {
+#if USE_BLOWFISH
+ { &_gcry_cipher_spec_blowfish, GCRY_CIPHER_BLOWFISH },
+#endif
+#if USE_DES
+ { &_gcry_cipher_spec_des, GCRY_CIPHER_DES },
+ { &_gcry_cipher_spec_tripledes, GCRY_CIPHER_3DES },
+#endif
+#if USE_ARCFOUR
+ { &_gcry_cipher_spec_arcfour, GCRY_CIPHER_ARCFOUR },
+#endif
+#if USE_CAST5
+ { &_gcry_cipher_spec_cast5, GCRY_CIPHER_CAST5 },
+#endif
+#if USE_AES
+ { &_gcry_cipher_spec_aes, GCRY_CIPHER_AES },
+ { &_gcry_cipher_spec_aes192, GCRY_CIPHER_AES192 },
+ { &_gcry_cipher_spec_aes256, GCRY_CIPHER_AES256 },
+#endif
+#if USE_TWOFISH
+ { &_gcry_cipher_spec_twofish, GCRY_CIPHER_TWOFISH },
+ { &_gcry_cipher_spec_twofish128, GCRY_CIPHER_TWOFISH128 },
+#endif
+#if USE_SERPENT
+ { &_gcry_cipher_spec_serpent128, GCRY_CIPHER_SERPENT128 },
+ { &_gcry_cipher_spec_serpent192, GCRY_CIPHER_SERPENT192 },
+ { &_gcry_cipher_spec_serpent256, GCRY_CIPHER_SERPENT256 },
+#endif
+#ifdef USE_RFC2268
+ { &_gcry_cipher_spec_rfc2268_40, GCRY_CIPHER_RFC2268_40 },
+#endif
+ { NULL },
+ };
+
+/* List of registered ciphers. */
+static gcry_module_t ciphers_registered;
+
+/* This is the lock protecting CIPHERS_REGISTERED. */
+static ath_mutex_t ciphers_registered_lock = ATH_MUTEX_INITIALIZER;
+
+/* Flag to check wether the default ciphers have already been
+ registered. */
+static int default_ciphers_registered;
+
+/* Convenient macro for registering the default ciphers. */
+#define REGISTER_DEFAULT_CIPHERS \
+ do \
+ { \
+ ath_mutex_lock (&ciphers_registered_lock); \
+ if (! default_ciphers_registered) \
+ { \
+ gcry_cipher_register_default (); \
+ default_ciphers_registered = 1; \
+ } \
+ ath_mutex_unlock (&ciphers_registered_lock); \
+ } \
+ while (0)
+
+/* The handle structure. */
+struct gcry_cipher_handle
+{
+ int magic;
+ size_t actual_handle_size; /* Allocated size of this handle. */
+ gcry_cipher_spec_t *cipher;
+ gcry_module_t module;
+ int mode;
+ unsigned int flags;
+ unsigned char iv[MAX_BLOCKSIZE]; /* (this should be ulong aligned) */
+ unsigned char lastiv[MAX_BLOCKSIZE];
+ int unused; /* in IV */
+ unsigned char ctr[MAX_BLOCKSIZE]; /* For Counter (CTR) mode. */
+ PROPERLY_ALIGNED_TYPE context;
+};
+
+
+/* These dummy functions are used in case a cipher implementation
+ refuses to provide it's own functions. */
+
+static gcry_err_code_t
+dummy_setkey (void *c, const unsigned char *key, unsigned keylen)
+{
+ return GPG_ERR_NO_ERROR;
+}
+
+static void
+dummy_encrypt_block (void *c,
+ unsigned char *outbuf, const unsigned char *inbuf)
+{
+ BUG();
+}
+
+static void
+dummy_decrypt_block (void *c,
+ unsigned char *outbuf, const unsigned char *inbuf)
+{
+ BUG();
+}
+
+static void
+dummy_encrypt_stream (void *c,
+ unsigned char *outbuf, const unsigned char *inbuf,
+ unsigned int n)
+{
+ BUG();
+}
+
+static void
+dummy_decrypt_stream (void *c,
+ unsigned char *outbuf, const unsigned char *inbuf,
+ unsigned int n)
+{
+ BUG();
+}
+
+
+/* Internal function. Register all the ciphers included in
+ CIPHER_TABLE. Note, that this function gets only used by the macro
+ REGISTER_DEFAULT_CIPHERS which protects it using a mutex. */
+static void
+gcry_cipher_register_default (void)
+{
+ gcry_err_code_t err = GPG_ERR_NO_ERROR;
+ int i;
+
+ for (i = 0; !err && cipher_table[i].cipher; i++)
+ {
+ if (! cipher_table[i].cipher->setkey)
+ cipher_table[i].cipher->setkey = dummy_setkey;
+ if (! cipher_table[i].cipher->encrypt)
+ cipher_table[i].cipher->encrypt = dummy_encrypt_block;
+ if (! cipher_table[i].cipher->decrypt)
+ cipher_table[i].cipher->decrypt = dummy_decrypt_block;
+ if (! cipher_table[i].cipher->stencrypt)
+ cipher_table[i].cipher->stencrypt = dummy_encrypt_stream;
+ if (! cipher_table[i].cipher->stdecrypt)
+ cipher_table[i].cipher->stdecrypt = dummy_decrypt_stream;
+
+ err = _gcry_module_add (&ciphers_registered,
+ cipher_table[i].algorithm,
+ (void *) cipher_table[i].cipher,
+ NULL);
+ }
+
+ if (err)
+ BUG ();
+}
+
+/* Internal callback function. Used via _gcry_module_lookup. */
+static int
+gcry_cipher_lookup_func_name (void *spec, void *data)
+{
+ gcry_cipher_spec_t *cipher = (gcry_cipher_spec_t *) spec;
+ char *name = (char *) data;
+ const char **aliases = cipher->aliases;
+ int i, ret = ! stricmp (name, cipher->name);
+
+ if (aliases)
+ for (i = 0; aliases[i] && (! ret); i++)
+ ret = ! stricmp (name, aliases[i]);
+
+ return ret;
+}
+
+/* Internal callback function. Used via _gcry_module_lookup. */
+static int
+gcry_cipher_lookup_func_oid (void *spec, void *data)
+{
+ gcry_cipher_spec_t *cipher = (gcry_cipher_spec_t *) spec;
+ char *oid = (char *) data;
+ gcry_cipher_oid_spec_t *oid_specs = cipher->oids;
+ int ret = 0, i;
+
+ if (oid_specs)
+ for (i = 0; oid_specs[i].oid && (! ret); i++)
+ if (! stricmp (oid, oid_specs[i].oid))
+ ret = 1;
+
+ return ret;
+}
+
+/* Internal function. Lookup a cipher entry by it's name. */
+static gcry_module_t
+gcry_cipher_lookup_name (const char *name)
+{
+ gcry_module_t cipher;
+
+ cipher = _gcry_module_lookup (ciphers_registered, (void *) name,
+ gcry_cipher_lookup_func_name);
+
+ return cipher;
+}
+
+/* Internal function. Lookup a cipher entry by it's oid. */
+static gcry_module_t
+gcry_cipher_lookup_oid (const char *oid)
+{
+ gcry_module_t cipher;
+
+ cipher = _gcry_module_lookup (ciphers_registered, (void *) oid,
+ gcry_cipher_lookup_func_oid);
+
+ return cipher;
+}
+
+/* Register a new cipher module whose specification can be found in
+ CIPHER. On success, a new algorithm ID is stored in ALGORITHM_ID
+ and a pointer representhing this module is stored in MODULE. */
+gcry_error_t
+gcry_cipher_register (gcry_cipher_spec_t *cipher,
+ unsigned int *algorithm_id,
+ gcry_module_t *module)
+{
+ gcry_err_code_t err = 0;
+ gcry_module_t mod;
+
+ ath_mutex_lock (&ciphers_registered_lock);
+ err = _gcry_module_add (&ciphers_registered, 0,
+ (void *) cipher, &mod);
+ ath_mutex_unlock (&ciphers_registered_lock);
+
+ if (! err)
+ {
+ *module = mod;
+ *algorithm_id = mod->mod_id;
+ }
+
+ return gcry_error (err);
+}
+
+/* Unregister the cipher identified by MODULE, which must have been
+ registered with gcry_cipher_register. */
+void
+gcry_cipher_unregister (gcry_module_t module)
+{
+ ath_mutex_lock (&ciphers_registered_lock);
+ _gcry_module_release (module);
+ ath_mutex_unlock (&ciphers_registered_lock);
+}
+
+/* Locate the OID in the oid table and return the index or -1 when not
+ found. An opitonal "oid." or "OID." prefix in OID is ignored, the
+ OID is expected to be in standard IETF dotted notation. The
+ internal algorithm number is returned in ALGORITHM unless it
+ ispassed as NULL. A pointer to the specification of the module
+ implementing this algorithm is return in OID_SPEC unless passed as
+ NULL.*/
+static int
+search_oid (const char *oid, int *algorithm, gcry_cipher_oid_spec_t *oid_spec)
+{
+ gcry_module_t module;
+ int ret = 0;
+
+ if (oid && ((! strncmp (oid, "oid.", 4))
+ || (! strncmp (oid, "OID.", 4))))
+ oid += 4;
+
+ module = gcry_cipher_lookup_oid (oid);
+ if (module)
+ {
+ gcry_cipher_spec_t *cipher = module->spec;
+ int i;
+
+ for (i = 0; cipher->oids[i].oid && !ret; i++)
+ if (! stricmp (oid, cipher->oids[i].oid))
+ {
+ if (algorithm)
+ *algorithm = module->mod_id;
+ if (oid_spec)
+ *oid_spec = cipher->oids[i];
+ ret = 1;
+ }
+ _gcry_module_release (module);
+ }
+
+ return ret;
+}
+
+/* Map STRING to the cipher algorithm identifier. Returns the
+ algorithm ID of the cipher for the given name or 0 if the name is
+ not known. It is valid to pass NULL for STRING which results in a
+ return value of 0. */
+int
+gcry_cipher_map_name (const char *string)
+{
+ gcry_module_t cipher;
+ int ret, algorithm = 0;
+
+ if (! string)
+ return 0;
+
+ REGISTER_DEFAULT_CIPHERS;
+
+ /* If the string starts with a digit (optionally prefixed with
+ either "OID." or "oid."), we first look into our table of ASN.1
+ object identifiers to figure out the algorithm */
+
+ ath_mutex_lock (&ciphers_registered_lock);
+
+ ret = search_oid (string, &algorithm, NULL);
+ if (! ret)
+ {
+ cipher = gcry_cipher_lookup_name (string);
+ if (cipher)
+ {
+ algorithm = cipher->mod_id;
+ _gcry_module_release (cipher);
+ }
+ }
+
+ ath_mutex_unlock (&ciphers_registered_lock);
+
+ return algorithm;
+}
+
+
+/* Given a STRING with an OID in dotted decimal notation, this
+ function returns the cipher mode (GCRY_CIPHER_MODE_*) associated
+ with that OID or 0 if no mode is known. Passing NULL for string
+ yields a return value of 0. */
+int
+gcry_cipher_mode_from_oid (const char *string)
+{
+ gcry_cipher_oid_spec_t oid_spec;
+ int ret = 0, mode = 0;
+
+ if (!string)
+ return 0;
+
+ ath_mutex_lock (&ciphers_registered_lock);
+ ret = search_oid (string, NULL, &oid_spec);
+ if (ret)
+ mode = oid_spec.mode;
+ ath_mutex_unlock (&ciphers_registered_lock);
+
+ return mode;
+}
+
+
+/* Map the cipher algorithm identifier ALGORITHM to a string
+ representing this algorithm. This string is the default name as
+ used by Libgcrypt. NULL is returned for an unknown algorithm. */
+static const char *
+cipher_algo_to_string (int algorithm)
+{
+ gcry_module_t cipher;
+ const char *name = NULL;
+
+ REGISTER_DEFAULT_CIPHERS;
+
+ ath_mutex_lock (&ciphers_registered_lock);
+ cipher = _gcry_module_lookup_id (ciphers_registered, algorithm);
+ if (cipher)
+ {
+ name = ((gcry_cipher_spec_t *) cipher->spec)->name;
+ _gcry_module_release (cipher);
+ }
+ ath_mutex_unlock (&ciphers_registered_lock);
+
+ return name;
+}
+
+/* Map the cipher algorithm identifier ALGORITHM to a string
+ representing this algorithm. This string is the default name as
+ used by Libgcrypt. An pointer to an empty string is returned for
+ an unknown algorithm. NULL is never returned. */
+const char *
+gcry_cipher_algo_name (int algorithm)
+{
+ const char *s = cipher_algo_to_string (algorithm);
+ return s ? s : "";
+}
+
+
+/* Flag the cipher algorithm with the identifier ALGORITHM as
+ disabled. There is no error return, the function does nothing for
+ unknown algorithms. Disabled algorithms are vitually not available
+ in Libgcrypt. */
+static void
+disable_cipher_algo (int algorithm)
+{
+ gcry_module_t cipher;
+
+ REGISTER_DEFAULT_CIPHERS;
+
+ ath_mutex_lock (&ciphers_registered_lock);
+ cipher = _gcry_module_lookup_id (ciphers_registered, algorithm);
+ if (cipher)
+ {
+ if (! (cipher->flags & FLAG_MODULE_DISABLED))
+ cipher->flags |= FLAG_MODULE_DISABLED;
+ _gcry_module_release (cipher);
+ }
+ ath_mutex_unlock (&ciphers_registered_lock);
+}
+
+
+/* Return 0 if the cipher algorithm with indentifier ALGORITHM is
+ available. Returns a basic error code value if it is not available. */
+static gcry_err_code_t
+check_cipher_algo (int algorithm)
+{
+ gcry_err_code_t err = GPG_ERR_NO_ERROR;
+ gcry_module_t cipher;
+
+ REGISTER_DEFAULT_CIPHERS;
+
+ ath_mutex_lock (&ciphers_registered_lock);
+ cipher = _gcry_module_lookup_id (ciphers_registered, algorithm);
+ if (cipher)
+ {
+ if (cipher->flags & FLAG_MODULE_DISABLED)
+ err = GPG_ERR_CIPHER_ALGO;
+ _gcry_module_release (cipher);
+ }
+ else
+ err = GPG_ERR_CIPHER_ALGO;
+ ath_mutex_unlock (&ciphers_registered_lock);
+
+ return err;
+}
+
+
+/* Return the standard length of the key for the cipher algorithm with
+ the identifier ALGORITHM. This function expects a valid algorithm
+ and will abort if the algorithm is not available or the length of
+ the key is not known. */
+static unsigned int
+cipher_get_keylen (int algorithm)
+{
+ gcry_module_t cipher;
+ unsigned len = 0;
+
+ REGISTER_DEFAULT_CIPHERS;
+
+ ath_mutex_lock (&ciphers_registered_lock);
+ cipher = _gcry_module_lookup_id (ciphers_registered, algorithm);
+ if (cipher)
+ {
+ len = ((gcry_cipher_spec_t *) cipher->spec)->keylen;
+ if (! len)
+ log_bug ("cipher %d w/o key length\n", algorithm);
+ _gcry_module_release (cipher);
+ }
+ else
+ log_bug ("cipher %d not found\n", algorithm);
+ ath_mutex_unlock (&ciphers_registered_lock);
+
+ return len;
+}
+
+/* Return the block length of the cipher algorithm with the identifier
+ ALGORITHM. This function expects a valid algorithm and will abort
+ if the algorithm is not available or the length of the key is not
+ known. */
+static unsigned int
+cipher_get_blocksize (int algorithm)
+{
+ gcry_module_t cipher;
+ unsigned len = 0;
+
+ REGISTER_DEFAULT_CIPHERS;
+
+ ath_mutex_lock (&ciphers_registered_lock);
+ cipher = _gcry_module_lookup_id (ciphers_registered, algorithm);
+ if (cipher)
+ {
+ len = ((gcry_cipher_spec_t *) cipher->spec)->blocksize;
+ if (! len)
+ log_bug ("cipher %d w/o blocksize\n", algorithm);
+ _gcry_module_release (cipher);
+ }
+ else
+ log_bug ("cipher %d not found\n", algorithm);
+ ath_mutex_unlock (&ciphers_registered_lock);
+
+ return len;
+}
+
+
+/*
+ Open a cipher handle for use with cipher algorithm ALGORITHM, using
+ the cipher mode MODE (one of the GCRY_CIPHER_MODE_*) and return a
+ handle in HANDLE. Put NULL into HANDLE and return an error code if
+ something goes wrong. FLAGS may be used to modify the
+ operation. The defined flags are:
+
+ GCRY_CIPHER_SECURE: allocate all internal buffers in secure memory.
+ GCRY_CIPHER_ENABLE_SYNC: Enable the sync operation as used in OpenPGP.
+ GCRY_CIPHER_CBC_CTS: Enable CTS mode.
+ GCRY_CIPHER_CBC_MAC: Enable MAC mode.
+
+ Values for these flags may be combined using OR.
+ */
+gcry_error_t
+gcry_cipher_open (gcry_cipher_hd_t *handle,
+ int algo, int mode, unsigned int flags)
+{
+ int secure = (flags & GCRY_CIPHER_SECURE);
+ gcry_cipher_spec_t *cipher = NULL;
+ gcry_module_t module = NULL;
+ gcry_cipher_hd_t h = NULL;
+ gcry_err_code_t err = 0;
+
+ /* If the application missed to call the random poll function, we do
+ it here to ensure that it is used once in a while. */
+ _gcry_fast_random_poll ();
+
+ REGISTER_DEFAULT_CIPHERS;
+
+ /* Fetch the according module and check wether the cipher is marked
+ available for use. */
+ ath_mutex_lock (&ciphers_registered_lock);
+ module = _gcry_module_lookup_id (ciphers_registered, algo);
+ if (module)
+ {
+ /* Found module. */
+
+ if (module->flags & FLAG_MODULE_DISABLED)
+ {
+ /* Not available for use. */
+ err = GPG_ERR_CIPHER_ALGO;
+ _gcry_module_release (module);
+ }
+ else
+ cipher = (gcry_cipher_spec_t *) module->spec;
+ }
+ else
+ err = GPG_ERR_CIPHER_ALGO;
+ ath_mutex_unlock (&ciphers_registered_lock);
+
+ /* check flags */
+ if ((! err)
+ && ((flags & ~(0
+ | GCRY_CIPHER_SECURE
+ | GCRY_CIPHER_ENABLE_SYNC
+ | GCRY_CIPHER_CBC_CTS
+ | GCRY_CIPHER_CBC_MAC))
+ || (flags & GCRY_CIPHER_CBC_CTS & GCRY_CIPHER_CBC_MAC)))
+ err = GPG_ERR_CIPHER_ALGO;
+
+ /* check that a valid mode has been requested */
+ if (! err)
+ switch (mode)
+ {
+ case GCRY_CIPHER_MODE_ECB:
+ case GCRY_CIPHER_MODE_CBC:
+ case GCRY_CIPHER_MODE_CFB:
+ case GCRY_CIPHER_MODE_CTR:
+ if ((cipher->encrypt == dummy_encrypt_block)
+ || (cipher->decrypt == dummy_decrypt_block))
+ err = GPG_ERR_INV_CIPHER_MODE;
+ break;
+
+ case GCRY_CIPHER_MODE_STREAM:
+ if ((cipher->stencrypt == dummy_encrypt_stream)
+ || (cipher->stdecrypt == dummy_decrypt_stream))
+ err = GPG_ERR_INV_CIPHER_MODE;
+ break;
+
+ case GCRY_CIPHER_MODE_NONE:
+ /* FIXME: issue a warning when this mode is used */
+ break;
+
+ default:
+ err = GPG_ERR_INV_CIPHER_MODE;
+ }
+
+ /* ? FIXME: perform selftest here and mark this with a flag in
+ cipher_table ? */
+
+ if (! err)
+ {
+ size_t size = (sizeof (*h)
+ + 2 * cipher->contextsize
+ - sizeof (PROPERLY_ALIGNED_TYPE));
+
+ if (secure)
+ h = gcry_calloc_secure (1, size);
+ else
+ h = gcry_calloc (1, size);
+
+ if (! h)
+ err = gpg_err_code_from_errno (errno);
+ else
+ {
+ h->magic = secure ? CTX_MAGIC_SECURE : CTX_MAGIC_NORMAL;
+ h->actual_handle_size = size;
+ h->cipher = cipher;
+ h->module = module;
+ h->mode = mode;
+ h->flags = flags;
+ }
+ }
+
+ /* Done. */
+
+ if (err)
+ {
+ if (module)
+ {
+ /* Release module. */
+ ath_mutex_lock (&ciphers_registered_lock);
+ _gcry_module_release (module);
+ ath_mutex_unlock (&ciphers_registered_lock);
+ }
+ }
+
+ *handle = err ? NULL : h;
+
+ return gcry_error (err);
+}
+
+
+/* Release all resources associated with the cipher handle H. H may be
+ NULL in which case this is a no-operation. */
+void
+gcry_cipher_close (gcry_cipher_hd_t h)
+{
+ if (! h)
+ return;
+
+ if ((h->magic != CTX_MAGIC_SECURE)
+ && (h->magic != CTX_MAGIC_NORMAL))
+ _gcry_fatal_error(GPG_ERR_INTERNAL,
+ "gcry_cipher_close: already closed/invalid handle");
+ else
+ h->magic = 0;
+
+ /* Release module. */
+ ath_mutex_lock (&ciphers_registered_lock);
+ _gcry_module_release (h->module);
+ ath_mutex_unlock (&ciphers_registered_lock);
+
+ /* We always want to wipe out the memory even when the context has
+ been allocated in secure memory. The user might have disabled
+ secure memory or is using his own implementation which does not
+ do the wiping. To accomplish this we need to keep track of the
+ actual size of this structure because we have no way to known
+ how large the allocated area was when using a standard malloc. */
+ wipememory (h, h->actual_handle_size);
+
+ gcry_free (h);
+}
+
+
+/* Set the key to be used for the encryption context C to KEY with
+ length KEYLEN. The length should match the required length. */
+static gcry_error_t
+cipher_setkey (gcry_cipher_hd_t c, byte *key, unsigned keylen)
+{
+ gcry_err_code_t ret;
+
+ ret = (*c->cipher->setkey) (&c->context.c, key, keylen);
+ if (! ret)
+ /* Duplicate initial context. */
+ memcpy ((void *) ((char *) &c->context.c + c->cipher->contextsize),
+ (void *) &c->context.c,
+ c->cipher->contextsize);
+
+ return gcry_error (ret);
+}
+
+
+/* Set the IV to be used for the encryption context C to IV with
+ length IVLEN. The length should match the required length. */
+static void
+cipher_setiv( gcry_cipher_hd_t c, const byte *iv, unsigned ivlen )
+{
+ memset( c->iv, 0, c->cipher->blocksize );
+ if( iv ) {
+ if( ivlen != c->cipher->blocksize )
+ log_info("WARNING: cipher_setiv: ivlen=%u blklen=%u\n",
+ ivlen, (unsigned) c->cipher->blocksize );
+ if (ivlen > c->cipher->blocksize)
+ ivlen = c->cipher->blocksize;
+ memcpy( c->iv, iv, ivlen );
+ }
+ c->unused = 0;
+}
+
+
+/* Reset the cipher context to the initial contex. This is basically
+ the same as an release followed by a new. */
+static void
+cipher_reset (gcry_cipher_hd_t c)
+{
+ memcpy (&c->context.c,
+ (char *) &c->context.c + c->cipher->contextsize,
+ c->cipher->contextsize);
+ memset (c->iv, 0, c->cipher->blocksize);
+ memset (c->lastiv, 0, c->cipher->blocksize);
+ memset (c->ctr, 0, c->cipher->blocksize);
+}
+
+
+static void
+do_ecb_encrypt( gcry_cipher_hd_t c, byte *outbuf, const byte *inbuf,
+ unsigned int nblocks )
+{
+ unsigned int n;
+
+ for(n=0; n < nblocks; n++ ) {
+ c->cipher->encrypt ( &c->context.c, outbuf, (byte*)/*arggg*/inbuf );
+ inbuf += c->cipher->blocksize;
+ outbuf += c->cipher->blocksize;
+ }
+}
+
+static void
+do_ecb_decrypt( gcry_cipher_hd_t c, byte *outbuf, const byte *inbuf,
+ unsigned int nblocks )
+{
+ unsigned n;
+
+ for(n=0; n < nblocks; n++ ) {
+ c->cipher->decrypt ( &c->context.c, outbuf, (byte*)/*arggg*/inbuf );
+ inbuf += c->cipher->blocksize;
+ outbuf += c->cipher->blocksize;
+ }
+}
+
+static void
+do_cbc_encrypt( gcry_cipher_hd_t c, byte *outbuf, const byte *inbuf,
+ unsigned int nbytes )
+{
+ unsigned int n;
+ byte *ivp;
+ int i;
+ size_t blocksize = c->cipher->blocksize;
+ unsigned nblocks = nbytes / blocksize;
+
+ if ((c->flags & GCRY_CIPHER_CBC_CTS) && nbytes > blocksize) {
+ if ((nbytes % blocksize) == 0)
+ nblocks--;
+ }
+
+ for(n=0; n < nblocks; n++ ) {
+ /* fixme: the xor should work on words and not on
+ * bytes. Maybe it is a good idea to enhance the cipher backend
+ * API to allow for CBC handling direct in the backend */
+ for(ivp=c->iv,i=0; i < blocksize; i++ )
+ outbuf[i] = inbuf[i] ^ *ivp++;
+ c->cipher->encrypt ( &c->context.c, outbuf, outbuf );
+ memcpy(c->iv, outbuf, blocksize );
+ inbuf += c->cipher->blocksize;
+ if (!(c->flags & GCRY_CIPHER_CBC_MAC))
+ outbuf += c->cipher->blocksize;
+ }
+
+ if ((c->flags & GCRY_CIPHER_CBC_CTS) && nbytes > blocksize)
+ {
+ int restbytes;
+
+ if ((nbytes % blocksize) == 0)
+ restbytes = blocksize;
+ else
+ restbytes = nbytes % blocksize;
+
+ memcpy(outbuf, outbuf - c->cipher->blocksize, restbytes);
+ outbuf -= c->cipher->blocksize;
+
+ for(ivp=c->iv,i=0; i < restbytes; i++ )
+ outbuf[i] = inbuf[i] ^ *ivp++;
+ for(; i < blocksize; i++ )
+ outbuf[i] = 0 ^ *ivp++;
+
+ c->cipher->encrypt ( &c->context.c, outbuf, outbuf );
+ memcpy(c->iv, outbuf, blocksize );
+ }
+}
+
+static void
+do_cbc_decrypt( gcry_cipher_hd_t c, byte *outbuf, const byte *inbuf,
+ unsigned int nbytes )
+{
+ unsigned int n;
+ byte *ivp;
+ int i;
+ size_t blocksize = c->cipher->blocksize;
+ unsigned int nblocks = nbytes / blocksize;
+
+ if ((c->flags & GCRY_CIPHER_CBC_CTS) && nbytes > blocksize) {
+ nblocks--;
+ if ((nbytes % blocksize) == 0)
+ nblocks--;
+ memcpy(c->lastiv, c->iv, blocksize );
+ }
+
+ for(n=0; n < nblocks; n++ ) {
+ /* Because outbuf and inbuf might be the same, we have
+ * to save the original ciphertext block. We use lastiv
+ * for this here because it is not used otherwise. */
+ memcpy(c->lastiv, inbuf, blocksize );
+ c->cipher->decrypt ( &c->context.c, outbuf, inbuf );
+ for(ivp=c->iv,i=0; i < blocksize; i++ )
+ outbuf[i] ^= *ivp++;
+ memcpy(c->iv, c->lastiv, blocksize );
+ inbuf += c->cipher->blocksize;
+ outbuf += c->cipher->blocksize;
+ }
+
+ if ((c->flags & GCRY_CIPHER_CBC_CTS) && nbytes > blocksize) {
+ int restbytes;
+
+ if ((nbytes % blocksize) == 0)
+ restbytes = blocksize;
+ else
+ restbytes = nbytes % blocksize;
+
+ memcpy(c->lastiv, c->iv, blocksize ); /* save Cn-2 */
+ memcpy(c->iv, inbuf + blocksize, restbytes ); /* save Cn */
+
+ c->cipher->decrypt ( &c->context.c, outbuf, inbuf );
+ for(ivp=c->iv,i=0; i < restbytes; i++ )
+ outbuf[i] ^= *ivp++;
+
+ memcpy(outbuf + blocksize, outbuf, restbytes);
+ for(i=restbytes; i < blocksize; i++)
+ c->iv[i] = outbuf[i];
+ c->cipher->decrypt ( &c->context.c, outbuf, c->iv );
+ for(ivp=c->lastiv,i=0; i < blocksize; i++ )
+ outbuf[i] ^= *ivp++;
+ /* c->lastiv is now really lastlastiv, does this matter? */
+ }
+}
+
+
+static void
+do_cfb_encrypt( gcry_cipher_hd_t c,
+ byte *outbuf, const byte *inbuf, unsigned nbytes )
+{
+ byte *ivp;
+ size_t blocksize = c->cipher->blocksize;
+
+ if( nbytes <= c->unused ) {
+ /* Short enough to be encoded by the remaining XOR mask. */
+ /* XOR the input with the IV and store input into IV. */
+ for (ivp=c->iv+c->cipher->blocksize - c->unused;
+ nbytes;
+ nbytes--, c->unused-- )
+ *outbuf++ = (*ivp++ ^= *inbuf++);
+ return;
+ }
+
+ if( c->unused ) {
+ /* XOR the input with the IV and store input into IV */
+ nbytes -= c->unused;
+ for(ivp=c->iv+blocksize - c->unused; c->unused; c->unused-- )
+ *outbuf++ = (*ivp++ ^= *inbuf++);
+ }
+
+ /* Now we can process complete blocks. */
+ while( nbytes >= blocksize ) {
+ int i;
+ /* Encrypt the IV (and save the current one). */
+ memcpy( c->lastiv, c->iv, blocksize );
+ c->cipher->encrypt ( &c->context.c, c->iv, c->iv );
+ /* XOR the input with the IV and store input into IV */
+ for(ivp=c->iv,i=0; i < blocksize; i++ )
+ *outbuf++ = (*ivp++ ^= *inbuf++);
+ nbytes -= blocksize;
+ }
+ if( nbytes ) { /* process the remaining bytes */
+ /* encrypt the IV (and save the current one) */
+ memcpy( c->lastiv, c->iv, blocksize );
+ c->cipher->encrypt ( &c->context.c, c->iv, c->iv );
+ c->unused = blocksize;
+ /* and apply the xor */
+ c->unused -= nbytes;
+ for(ivp=c->iv; nbytes; nbytes-- )
+ *outbuf++ = (*ivp++ ^= *inbuf++);
+ }
+}
+
+static void
+do_cfb_decrypt( gcry_cipher_hd_t c,
+ byte *outbuf, const byte *inbuf, unsigned int nbytes )
+{
+ byte *ivp;
+ ulong temp;
+ size_t blocksize = c->cipher->blocksize;
+
+ if( nbytes <= c->unused ) {
+ /* Short enough to be encoded by the remaining XOR mask. */
+ /* XOR the input with the IV and store input into IV. */
+ for(ivp=c->iv+blocksize - c->unused; nbytes; nbytes--,c->unused--) {
+ temp = *inbuf++;
+ *outbuf++ = *ivp ^ temp;
+ *ivp++ = temp;
+ }
+ return;
+ }
+
+ if( c->unused ) {
+ /* XOR the input with the IV and store input into IV. */
+ nbytes -= c->unused;
+ for(ivp=c->iv+blocksize - c->unused; c->unused; c->unused-- ) {
+ temp = *inbuf++;
+ *outbuf++ = *ivp ^ temp;
+ *ivp++ = temp;
+ }
+ }
+
+ /* now we can process complete blocks */
+ while( nbytes >= blocksize ) {
+ int i;
+ /* encrypt the IV (and save the current one) */
+ memcpy( c->lastiv, c->iv, blocksize );
+ c->cipher->encrypt ( &c->context.c, c->iv, c->iv );
+ /* XOR the input with the IV and store input into IV */
+ for(ivp=c->iv,i=0; i < blocksize; i++ ) {
+ temp = *inbuf++;
+ *outbuf++ = *ivp ^ temp;
+ *ivp++ = temp;
+ }
+ nbytes -= blocksize;
+ }
+ if( nbytes ) { /* process the remaining bytes */
+ /* encrypt the IV (and save the current one) */
+ memcpy( c->lastiv, c->iv, blocksize );
+ c->cipher->encrypt ( &c->context.c, c->iv, c->iv );
+ c->unused = blocksize;
+ /* and apply the xor */
+ c->unused -= nbytes;
+ for(ivp=c->iv; nbytes; nbytes-- ) {
+ temp = *inbuf++;
+ *outbuf++ = *ivp ^ temp;
+ *ivp++ = temp;
+ }
+ }
+}
+
+
+static void
+do_ctr_encrypt( gcry_cipher_hd_t c, byte *outbuf, const byte *inbuf,
+ unsigned int nbytes )
+{
+ unsigned int n;
+ byte tmp[MAX_BLOCKSIZE];
+ int i;
+
+ for(n=0; n < nbytes; n++)
+ {
+ if ((n % c->cipher->blocksize) == 0)
+ {
+ c->cipher->encrypt (&c->context.c, tmp, c->ctr);
+
+ for (i = c->cipher->blocksize; i > 0; i--)
+ {
+ c->ctr[i-1]++;
+ if (c->ctr[i-1] != 0)
+ break;
+ }
+ }
+
+ /* XOR input with encrypted counter and store in output. */
+ outbuf[n] = inbuf[n] ^ tmp[n % c->cipher->blocksize];
+ }
+}
+
+static void
+do_ctr_decrypt( gcry_cipher_hd_t c, byte *outbuf, const byte *inbuf,
+ unsigned int nbytes )
+{
+ do_ctr_encrypt (c, outbuf, inbuf, nbytes);
+}
+
+
+/****************
+ * Encrypt INBUF to OUTBUF with the mode selected at open.
+ * inbuf and outbuf may overlap or be the same.
+ * Depending on the mode some contraints apply to NBYTES.
+ */
+static gcry_err_code_t
+cipher_encrypt (gcry_cipher_hd_t c, byte *outbuf,
+ const byte *inbuf, unsigned int nbytes)
+{
+ gcry_err_code_t rc = GPG_ERR_NO_ERROR;
+
+ switch( c->mode ) {
+ case GCRY_CIPHER_MODE_ECB:
+ if (!(nbytes%c->cipher->blocksize))
+ do_ecb_encrypt(c, outbuf, inbuf, nbytes/c->cipher->blocksize );
+ else
+ rc = GPG_ERR_INV_ARG;
+ break;
+ case GCRY_CIPHER_MODE_CBC:
+ if (!(nbytes%c->cipher->blocksize)
+ || (nbytes > c->cipher->blocksize
+ && (c->flags & GCRY_CIPHER_CBC_CTS)))
+ do_cbc_encrypt(c, outbuf, inbuf, nbytes );
+ else
+ rc = GPG_ERR_INV_ARG;
+ break;
+ case GCRY_CIPHER_MODE_CFB:
+ do_cfb_encrypt(c, outbuf, inbuf, nbytes );
+ break;
+ case GCRY_CIPHER_MODE_CTR:
+ do_ctr_encrypt(c, outbuf, inbuf, nbytes );
+ break;
+ case GCRY_CIPHER_MODE_STREAM:
+ c->cipher->stencrypt ( &c->context.c,
+ outbuf, (byte*)/*arggg*/inbuf, nbytes );
+ break;
+ case GCRY_CIPHER_MODE_NONE:
+ if( inbuf != outbuf )
+ memmove( outbuf, inbuf, nbytes );
+ break;
+ default:
+ log_fatal("cipher_encrypt: invalid mode %d\n", c->mode );
+ rc = GPG_ERR_INV_CIPHER_MODE;
+ break;
+ }
+ return rc;
+}
+
+
+/****************
+ * Encrypt IN and write it to OUT. If IN is NULL, in-place encryption has
+ * been requested.
+ */
+gcry_error_t
+gcry_cipher_encrypt (gcry_cipher_hd_t h, byte *out, size_t outsize,
+ const byte *in, size_t inlen)
+{
+ gcry_err_code_t err;
+
+ if (!in)
+ /* Caller requested in-place encryption. */
+ /* Actullay cipher_encrypt() does not need to know about it, but
+ * we may change this to get better performance. */
+ err = cipher_encrypt (h, out, out, outsize);
+ else if (outsize < ((h->flags & GCRY_CIPHER_CBC_MAC) ?
+ h->cipher->blocksize : inlen))
+ err = GPG_ERR_TOO_SHORT;
+ else if ((h->mode == GCRY_CIPHER_MODE_ECB
+ || (h->mode == GCRY_CIPHER_MODE_CBC
+ && (! ((h->flags & GCRY_CIPHER_CBC_CTS)
+ && (inlen > h->cipher->blocksize)))))
+ && (inlen % h->cipher->blocksize))
+ err = GPG_ERR_INV_ARG;
+ else
+ err = cipher_encrypt (h, out, in, inlen);
+
+ if (err && out)
+ memset (out, 0x42, outsize); /* Failsafe: Make sure that the
+ plaintext will never make it into
+ OUT. */
+
+ return gcry_error (err);
+}
+
+
+
+/****************
+ * Decrypt INBUF to OUTBUF with the mode selected at open.
+ * inbuf and outbuf may overlap or be the same.
+ * Depending on the mode some some contraints apply to NBYTES.
+ */
+static gcry_err_code_t
+cipher_decrypt (gcry_cipher_hd_t c, byte *outbuf, const byte *inbuf,
+ unsigned int nbytes)
+{
+ gcry_err_code_t rc = GPG_ERR_NO_ERROR;
+
+ switch( c->mode ) {
+ case GCRY_CIPHER_MODE_ECB:
+ if (!(nbytes%c->cipher->blocksize))
+ do_ecb_decrypt(c, outbuf, inbuf, nbytes/c->cipher->blocksize );
+ else
+ rc = GPG_ERR_INV_ARG;
+ break;
+ case GCRY_CIPHER_MODE_CBC:
+ if (!(nbytes%c->cipher->blocksize)
+ || (nbytes > c->cipher->blocksize
+ && (c->flags & GCRY_CIPHER_CBC_CTS)))
+ do_cbc_decrypt(c, outbuf, inbuf, nbytes );
+ else
+ rc = GPG_ERR_INV_ARG;
+ break;
+ case GCRY_CIPHER_MODE_CFB:
+ do_cfb_decrypt(c, outbuf, inbuf, nbytes );
+ break;
+ case GCRY_CIPHER_MODE_CTR:
+ do_ctr_decrypt(c, outbuf, inbuf, nbytes );
+ break;
+ case GCRY_CIPHER_MODE_STREAM:
+ c->cipher->stdecrypt ( &c->context.c,
+ outbuf, (byte*)/*arggg*/inbuf, nbytes );
+ break;
+ case GCRY_CIPHER_MODE_NONE:
+ if( inbuf != outbuf )
+ memmove( outbuf, inbuf, nbytes );
+ break;
+ default:
+ log_fatal ("cipher_decrypt: invalid mode %d\n", c->mode );
+ rc = GPG_ERR_INV_CIPHER_MODE;
+ break;
+ }
+ return rc;
+}
+
+
+gcry_error_t
+gcry_cipher_decrypt (gcry_cipher_hd_t h, byte *out, size_t outsize,
+ const byte *in, size_t inlen)
+{
+ gcry_err_code_t err = GPG_ERR_NO_ERROR;
+
+ if (! in)
+ /* Caller requested in-place encryption. */
+ /* Actullay cipher_encrypt() does not need to know about it, but
+ * we may chnage this to get better performance. */
+ err = cipher_decrypt (h, out, out, outsize);
+ else if (outsize < inlen)
+ err = GPG_ERR_TOO_SHORT;
+ else if (((h->mode == GCRY_CIPHER_MODE_ECB)
+ || ((h->mode == GCRY_CIPHER_MODE_CBC)
+ && (! ((h->flags & GCRY_CIPHER_CBC_CTS)
+ && (inlen > h->cipher->blocksize)))))
+ && (inlen % h->cipher->blocksize) != 0)
+ err = GPG_ERR_INV_ARG;
+ else
+ err = cipher_decrypt (h, out, in, inlen);
+
+ return gcry_error (err);
+}
+
+
+
+/****************
+ * Used for PGP's somewhat strange CFB mode. Only works if
+ * the corresponding flag is set.
+ */
+static void
+cipher_sync( gcry_cipher_hd_t c )
+{
+ if( (c->flags & GCRY_CIPHER_ENABLE_SYNC) && c->unused ) {
+ memmove(c->iv + c->unused, c->iv, c->cipher->blocksize - c->unused );
+ memcpy(c->iv, c->lastiv + c->cipher->blocksize - c->unused, c->unused);
+ c->unused = 0;
+ }
+}
+
+
+gcry_error_t
+gcry_cipher_ctl( gcry_cipher_hd_t h, int cmd, void *buffer, size_t buflen)
+{
+ gcry_err_code_t rc = GPG_ERR_NO_ERROR;
+
+ switch (cmd)
+ {
+ case GCRYCTL_SET_KEY:
+ rc = cipher_setkey( h, buffer, buflen );
+ break;
+ case GCRYCTL_SET_IV:
+ cipher_setiv( h, buffer, buflen );
+ break;
+ case GCRYCTL_RESET:
+ cipher_reset (h);
+ break;
+ case GCRYCTL_CFB_SYNC:
+ cipher_sync( h );
+ break;
+ case GCRYCTL_SET_CBC_CTS:
+ if (buflen)
+ if (h->flags & GCRY_CIPHER_CBC_MAC)
+ rc = GPG_ERR_INV_FLAG;
+ else
+ h->flags |= GCRY_CIPHER_CBC_CTS;
+ else
+ h->flags &= ~GCRY_CIPHER_CBC_CTS;
+ break;
+ case GCRYCTL_SET_CBC_MAC:
+ if (buflen)
+ if (h->flags & GCRY_CIPHER_CBC_CTS)
+ rc = GPG_ERR_INV_FLAG;
+ else
+ h->flags |= GCRY_CIPHER_CBC_MAC;
+ else
+ h->flags &= ~GCRY_CIPHER_CBC_MAC;
+ break;
+ case GCRYCTL_DISABLE_ALGO:
+ /* this one expects a NULL handle and buffer pointing to an
+ * integer with the algo number.
+ */
+ if( h || !buffer || buflen != sizeof(int) )
+ return gcry_error (GPG_ERR_CIPHER_ALGO);
+ disable_cipher_algo( *(int*)buffer );
+ break;
+ case GCRYCTL_SET_CTR:
+ if (buffer && buflen == h->cipher->blocksize)
+ memcpy (h->ctr, buffer, h->cipher->blocksize);
+ else if (buffer == NULL || buflen == 0)
+ memset (h->ctr, 0, h->cipher->blocksize);
+ else
+ rc = GPG_ERR_INV_ARG;
+ break;
+
+ default:
+ rc = GPG_ERR_INV_OP;
+ }
+
+ return gcry_error (rc);
+}
+
+
+/****************
+ * Return information about the cipher handle.
+ */
+gcry_error_t
+gcry_cipher_info( gcry_cipher_hd_t h, int cmd, void *buffer, size_t *nbytes)
+{
+ gcry_err_code_t err = GPG_ERR_NO_ERROR;
+
+ switch (cmd)
+ {
+ default:
+ err = GPG_ERR_INV_OP;
+ }
+
+ return gcry_error (err);
+}
+
+/****************
+ * Return information about the given cipher algorithm
+ * WHAT select the kind of information returned:
+ * GCRYCTL_GET_KEYLEN:
+ * Return the length of the key, if the algorithm
+ * supports multiple key length, the maximum supported value
+ * is returnd. The length is return as number of octets.
+ * buffer and nbytes must be zero.
+ * The keylength is returned in _bytes_.
+ * GCRYCTL_GET_BLKLEN:
+ * Return the blocklength of the algorithm counted in octets.
+ * buffer and nbytes must be zero.
+ * GCRYCTL_TEST_ALGO:
+ * Returns 0 when the specified algorithm is available for use.
+ * buffer and nbytes must be zero.
+ *
+ * Note: Because this function is in most cases used to return an
+ * integer value, we can make it easier for the caller to just look at
+ * the return value. The caller will in all cases consult the value
+ * and thereby detecting whether a error occured or not (i.e. while checking
+ * the block size)
+ */
+gcry_error_t
+gcry_cipher_algo_info (int algo, int what, void *buffer, size_t *nbytes)
+{
+ gcry_err_code_t err = GPG_ERR_NO_ERROR;
+ unsigned int ui;
+
+ switch (what)
+ {
+ case GCRYCTL_GET_KEYLEN:
+ if (buffer || (! nbytes))
+ err = GPG_ERR_CIPHER_ALGO;
+ else
+ {
+ ui = cipher_get_keylen (algo);
+ if ((ui > 0) && (ui <= 512))
+ *nbytes = (size_t) ui / 8;
+ else
+ /* The only reason is an invalid algo or a strange
+ blocksize. */
+ err = GPG_ERR_CIPHER_ALGO;
+ }
+ break;
+
+ case GCRYCTL_GET_BLKLEN:
+ if (buffer || (! nbytes))
+ err = GPG_ERR_CIPHER_ALGO;
+ else
+ {
+ ui = cipher_get_blocksize (algo);
+ if ((ui > 0) && (ui < 10000))
+ *nbytes = ui;
+ else
+ /* The only reason is an invalid algo or a strange
+ blocksize. */
+ err = GPG_ERR_CIPHER_ALGO;
+ }
+ break;
+
+ case GCRYCTL_TEST_ALGO:
+ if (buffer || nbytes)
+ err = GPG_ERR_INV_ARG;
+ else
+ err = check_cipher_algo (algo);
+ break;
+
+ default:
+ err = GPG_ERR_INV_OP;
+ }
+
+ return gcry_error (err);
+}
+
+
+size_t
+gcry_cipher_get_algo_keylen (int algo)
+{
+ size_t n;
+
+ if (gcry_cipher_algo_info( algo, GCRYCTL_GET_KEYLEN, NULL, &n))
+ n = 0;
+ return n;
+}
+
+
+size_t
+gcry_cipher_get_algo_blklen (int algo)
+{
+ size_t n;
+
+ if (gcry_cipher_algo_info( algo, GCRYCTL_GET_BLKLEN, NULL, &n))
+ n = 0;
+ return n;
+}
+
+
+gcry_err_code_t
+_gcry_cipher_init (void)
+{
+ gcry_err_code_t err = GPG_ERR_NO_ERROR;
+
+ REGISTER_DEFAULT_CIPHERS;
+
+ return err;
+}
+
+/* Get a list consisting of the IDs of the loaded cipher modules. If
+ LIST is zero, write the number of loaded cipher modules to
+ LIST_LENGTH and return. If LIST is non-zero, the first
+ *LIST_LENGTH algorithm IDs are stored in LIST, which must be of
+ according size. In case there are less cipher modules than
+ *LIST_LENGTH, *LIST_LENGTH is updated to the correct number. */
+gcry_error_t
+gcry_cipher_list (int *list, int *list_length)
+{
+ gcry_err_code_t err = GPG_ERR_NO_ERROR;
+
+ ath_mutex_lock (&ciphers_registered_lock);
+ err = _gcry_module_list (ciphers_registered, list, list_length);
+ ath_mutex_unlock (&ciphers_registered_lock);
+
+ return err;
+}