Merge remote-tracking branches 'regulator/topic/axp20x', 'regulator/topic/bd9571mwv...
[linux-2.6-block.git] / crypto / authencesn.c
CommitLineData
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1/*
2 * authencesn.c - AEAD wrapper for IPsec with extended sequence numbers,
3 * derived from authenc.c
4 *
5 * Copyright (C) 2010 secunet Security Networks AG
6 * Copyright (C) 2010 Steffen Klassert <steffen.klassert@secunet.com>
104880a6 7 * Copyright (c) 2015 Herbert Xu <herbert@gondor.apana.org.au>
a5079d08
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8 *
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the Free
11 * Software Foundation; either version 2 of the License, or (at your option)
12 * any later version.
13 *
14 */
15
7fb2a4bd 16#include <crypto/internal/aead.h>
a5079d08
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17#include <crypto/internal/hash.h>
18#include <crypto/internal/skcipher.h>
19#include <crypto/authenc.h>
104880a6 20#include <crypto/null.h>
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21#include <crypto/scatterwalk.h>
22#include <linux/err.h>
23#include <linux/init.h>
24#include <linux/kernel.h>
25#include <linux/module.h>
26#include <linux/rtnetlink.h>
27#include <linux/slab.h>
28#include <linux/spinlock.h>
29
30struct authenc_esn_instance_ctx {
31 struct crypto_ahash_spawn auth;
32 struct crypto_skcipher_spawn enc;
33};
34
35struct crypto_authenc_esn_ctx {
36 unsigned int reqoff;
37 struct crypto_ahash *auth;
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38 struct crypto_skcipher *enc;
39 struct crypto_skcipher *null;
a5079d08
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40};
41
42struct authenc_esn_request_ctx {
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43 struct scatterlist src[2];
44 struct scatterlist dst[2];
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45 char tail[];
46};
47
48static void authenc_esn_request_complete(struct aead_request *req, int err)
49{
50 if (err != -EINPROGRESS)
51 aead_request_complete(req, err);
52}
53
104880a6
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54static int crypto_authenc_esn_setauthsize(struct crypto_aead *authenc_esn,
55 unsigned int authsize)
56{
57 if (authsize > 0 && authsize < 4)
58 return -EINVAL;
59
60 return 0;
61}
62
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63static int crypto_authenc_esn_setkey(struct crypto_aead *authenc_esn, const u8 *key,
64 unsigned int keylen)
65{
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66 struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
67 struct crypto_ahash *auth = ctx->auth;
e75445a8 68 struct crypto_skcipher *enc = ctx->enc;
fddc2c43 69 struct crypto_authenc_keys keys;
a5079d08
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70 int err = -EINVAL;
71
fddc2c43 72 if (crypto_authenc_extractkeys(&keys, key, keylen) != 0)
a5079d08 73 goto badkey;
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74
75 crypto_ahash_clear_flags(auth, CRYPTO_TFM_REQ_MASK);
76 crypto_ahash_set_flags(auth, crypto_aead_get_flags(authenc_esn) &
77 CRYPTO_TFM_REQ_MASK);
fddc2c43 78 err = crypto_ahash_setkey(auth, keys.authkey, keys.authkeylen);
a5079d08
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79 crypto_aead_set_flags(authenc_esn, crypto_ahash_get_flags(auth) &
80 CRYPTO_TFM_RES_MASK);
81
82 if (err)
83 goto out;
84
e75445a8
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85 crypto_skcipher_clear_flags(enc, CRYPTO_TFM_REQ_MASK);
86 crypto_skcipher_set_flags(enc, crypto_aead_get_flags(authenc_esn) &
a5079d08 87 CRYPTO_TFM_REQ_MASK);
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88 err = crypto_skcipher_setkey(enc, keys.enckey, keys.enckeylen);
89 crypto_aead_set_flags(authenc_esn, crypto_skcipher_get_flags(enc) &
a5079d08
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90 CRYPTO_TFM_RES_MASK);
91
92out:
93 return err;
94
95badkey:
96 crypto_aead_set_flags(authenc_esn, CRYPTO_TFM_RES_BAD_KEY_LEN);
97 goto out;
98}
99
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100static int crypto_authenc_esn_genicv_tail(struct aead_request *req,
101 unsigned int flags)
a5079d08 102{
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103 struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
104 struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
105 struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req);
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106 struct crypto_ahash *auth = ctx->auth;
107 u8 *hash = PTR_ALIGN((u8 *)areq_ctx->tail,
108 crypto_ahash_alignmask(auth) + 1);
109 unsigned int authsize = crypto_aead_authsize(authenc_esn);
110 unsigned int assoclen = req->assoclen;
111 unsigned int cryptlen = req->cryptlen;
112 struct scatterlist *dst = req->dst;
113 u32 tmp[2];
a5079d08 114
104880a6
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115 /* Move high-order bits of sequence number back. */
116 scatterwalk_map_and_copy(tmp, dst, 4, 4, 0);
117 scatterwalk_map_and_copy(tmp + 1, dst, assoclen + cryptlen, 4, 0);
118 scatterwalk_map_and_copy(tmp, dst, 0, 8, 1);
a5079d08 119
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120 scatterwalk_map_and_copy(hash, dst, assoclen + cryptlen, authsize, 1);
121 return 0;
a5079d08
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122}
123
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124static void authenc_esn_geniv_ahash_done(struct crypto_async_request *areq,
125 int err)
126{
127 struct aead_request *req = areq->data;
a5079d08 128
104880a6 129 err = err ?: crypto_authenc_esn_genicv_tail(req, 0);
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130 aead_request_complete(req, err);
131}
132
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133static int crypto_authenc_esn_genicv(struct aead_request *req,
134 unsigned int flags)
a5079d08 135{
a5079d08 136 struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
a5079d08 137 struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req);
a5079d08 138 struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
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139 struct crypto_ahash *auth = ctx->auth;
140 u8 *hash = PTR_ALIGN((u8 *)areq_ctx->tail,
141 crypto_ahash_alignmask(auth) + 1);
a5079d08 142 struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);
104880a6
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143 unsigned int authsize = crypto_aead_authsize(authenc_esn);
144 unsigned int assoclen = req->assoclen;
a5079d08 145 unsigned int cryptlen = req->cryptlen;
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146 struct scatterlist *dst = req->dst;
147 u32 tmp[2];
a5079d08 148
104880a6
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149 if (!authsize)
150 return 0;
a5079d08 151
104880a6
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152 /* Move high-order bits of sequence number to the end. */
153 scatterwalk_map_and_copy(tmp, dst, 0, 8, 0);
154 scatterwalk_map_and_copy(tmp, dst, 4, 4, 1);
155 scatterwalk_map_and_copy(tmp + 1, dst, assoclen + cryptlen, 4, 1);
a5079d08 156
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157 sg_init_table(areq_ctx->dst, 2);
158 dst = scatterwalk_ffwd(areq_ctx->dst, dst, 4);
a5079d08 159
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160 ahash_request_set_tfm(ahreq, auth);
161 ahash_request_set_crypt(ahreq, dst, hash, assoclen + cryptlen);
162 ahash_request_set_callback(ahreq, flags,
163 authenc_esn_geniv_ahash_done, req);
a5079d08 164
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165 return crypto_ahash_digest(ahreq) ?:
166 crypto_authenc_esn_genicv_tail(req, aead_request_flags(req));
a5079d08
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167}
168
169
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170static void crypto_authenc_esn_encrypt_done(struct crypto_async_request *req,
171 int err)
a5079d08 172{
104880a6 173 struct aead_request *areq = req->data;
a5079d08 174
104880a6
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175 if (!err)
176 err = crypto_authenc_esn_genicv(areq, 0);
a5079d08 177
104880a6 178 authenc_esn_request_complete(areq, err);
a5079d08
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179}
180
104880a6 181static int crypto_authenc_esn_copy(struct aead_request *req, unsigned int len)
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182{
183 struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
184 struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
e75445a8 185 SKCIPHER_REQUEST_ON_STACK(skreq, ctx->null);
a5079d08 186
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187 skcipher_request_set_tfm(skreq, ctx->null);
188 skcipher_request_set_callback(skreq, aead_request_flags(req),
189 NULL, NULL);
190 skcipher_request_set_crypt(skreq, req->src, req->dst, len, NULL);
191
192 return crypto_skcipher_encrypt(skreq);
a5079d08
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193}
194
104880a6 195static int crypto_authenc_esn_encrypt(struct aead_request *req)
a5079d08
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196{
197 struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
198 struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req);
104880a6 199 struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
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200 struct skcipher_request *skreq = (void *)(areq_ctx->tail +
201 ctx->reqoff);
202 struct crypto_skcipher *enc = ctx->enc;
104880a6 203 unsigned int assoclen = req->assoclen;
a5079d08 204 unsigned int cryptlen = req->cryptlen;
104880a6
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205 struct scatterlist *src, *dst;
206 int err;
a5079d08 207
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208 sg_init_table(areq_ctx->src, 2);
209 src = scatterwalk_ffwd(areq_ctx->src, req->src, assoclen);
210 dst = src;
a5079d08 211
104880a6
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212 if (req->src != req->dst) {
213 err = crypto_authenc_esn_copy(req, assoclen);
214 if (err)
215 return err;
a5079d08 216
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217 sg_init_table(areq_ctx->dst, 2);
218 dst = scatterwalk_ffwd(areq_ctx->dst, req->dst, assoclen);
a5079d08
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219 }
220
e75445a8
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221 skcipher_request_set_tfm(skreq, enc);
222 skcipher_request_set_callback(skreq, aead_request_flags(req),
223 crypto_authenc_esn_encrypt_done, req);
224 skcipher_request_set_crypt(skreq, src, dst, cryptlen, req->iv);
a5079d08 225
e75445a8 226 err = crypto_skcipher_encrypt(skreq);
a5079d08
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227 if (err)
228 return err;
229
104880a6 230 return crypto_authenc_esn_genicv(req, aead_request_flags(req));
a5079d08
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231}
232
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233static int crypto_authenc_esn_decrypt_tail(struct aead_request *req,
234 unsigned int flags)
a5079d08 235{
104880a6
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236 struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
237 unsigned int authsize = crypto_aead_authsize(authenc_esn);
238 struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req);
239 struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
e75445a8
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240 struct skcipher_request *skreq = (void *)(areq_ctx->tail +
241 ctx->reqoff);
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242 struct crypto_ahash *auth = ctx->auth;
243 u8 *ohash = PTR_ALIGN((u8 *)areq_ctx->tail,
244 crypto_ahash_alignmask(auth) + 1);
245 unsigned int cryptlen = req->cryptlen - authsize;
246 unsigned int assoclen = req->assoclen;
247 struct scatterlist *dst = req->dst;
248 u8 *ihash = ohash + crypto_ahash_digestsize(auth);
249 u32 tmp[2];
a5079d08 250
104880a6
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251 /* Move high-order bits of sequence number back. */
252 scatterwalk_map_and_copy(tmp, dst, 4, 4, 0);
253 scatterwalk_map_and_copy(tmp + 1, dst, assoclen + cryptlen, 4, 0);
254 scatterwalk_map_and_copy(tmp, dst, 0, 8, 1);
a5079d08 255
104880a6
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256 if (crypto_memneq(ihash, ohash, authsize))
257 return -EBADMSG;
a5079d08 258
104880a6
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259 sg_init_table(areq_ctx->dst, 2);
260 dst = scatterwalk_ffwd(areq_ctx->dst, dst, assoclen);
a5079d08 261
e75445a8
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262 skcipher_request_set_tfm(skreq, ctx->enc);
263 skcipher_request_set_callback(skreq, flags,
264 req->base.complete, req->base.data);
265 skcipher_request_set_crypt(skreq, dst, dst, cryptlen, req->iv);
a5079d08 266
e75445a8 267 return crypto_skcipher_decrypt(skreq);
a5079d08
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268}
269
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270static void authenc_esn_verify_ahash_done(struct crypto_async_request *areq,
271 int err)
a5079d08 272{
104880a6 273 struct aead_request *req = areq->data;
a5079d08 274
104880a6
HX
275 err = err ?: crypto_authenc_esn_decrypt_tail(req, 0);
276 aead_request_complete(req, err);
a5079d08
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277}
278
104880a6 279static int crypto_authenc_esn_decrypt(struct aead_request *req)
a5079d08
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280{
281 struct crypto_aead *authenc_esn = crypto_aead_reqtfm(req);
282 struct authenc_esn_request_ctx *areq_ctx = aead_request_ctx(req);
104880a6
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283 struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(authenc_esn);
284 struct ahash_request *ahreq = (void *)(areq_ctx->tail + ctx->reqoff);
285 unsigned int authsize = crypto_aead_authsize(authenc_esn);
286 struct crypto_ahash *auth = ctx->auth;
287 u8 *ohash = PTR_ALIGN((u8 *)areq_ctx->tail,
288 crypto_ahash_alignmask(auth) + 1);
289 unsigned int assoclen = req->assoclen;
290 unsigned int cryptlen = req->cryptlen;
291 u8 *ihash = ohash + crypto_ahash_digestsize(auth);
292 struct scatterlist *dst = req->dst;
293 u32 tmp[2];
294 int err;
a5079d08 295
104880a6 296 cryptlen -= authsize;
a5079d08 297
104880a6
HX
298 if (req->src != dst) {
299 err = crypto_authenc_esn_copy(req, assoclen + cryptlen);
300 if (err)
301 return err;
302 }
a5079d08 303
104880a6
HX
304 scatterwalk_map_and_copy(ihash, req->src, assoclen + cryptlen,
305 authsize, 0);
a5079d08 306
104880a6
HX
307 if (!authsize)
308 goto tail;
a5079d08 309
104880a6
HX
310 /* Move high-order bits of sequence number to the end. */
311 scatterwalk_map_and_copy(tmp, dst, 0, 8, 0);
312 scatterwalk_map_and_copy(tmp, dst, 4, 4, 1);
313 scatterwalk_map_and_copy(tmp + 1, dst, assoclen + cryptlen, 4, 1);
a5079d08 314
104880a6
HX
315 sg_init_table(areq_ctx->dst, 2);
316 dst = scatterwalk_ffwd(areq_ctx->dst, dst, 4);
a5079d08 317
104880a6
HX
318 ahash_request_set_tfm(ahreq, auth);
319 ahash_request_set_crypt(ahreq, dst, ohash, assoclen + cryptlen);
320 ahash_request_set_callback(ahreq, aead_request_flags(req),
321 authenc_esn_verify_ahash_done, req);
a5079d08 322
104880a6 323 err = crypto_ahash_digest(ahreq);
a5079d08
SK
324 if (err)
325 return err;
326
104880a6
HX
327tail:
328 return crypto_authenc_esn_decrypt_tail(req, aead_request_flags(req));
a5079d08
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329}
330
104880a6 331static int crypto_authenc_esn_init_tfm(struct crypto_aead *tfm)
a5079d08 332{
104880a6
HX
333 struct aead_instance *inst = aead_alg_instance(tfm);
334 struct authenc_esn_instance_ctx *ictx = aead_instance_ctx(inst);
335 struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(tfm);
a5079d08 336 struct crypto_ahash *auth;
e75445a8
HX
337 struct crypto_skcipher *enc;
338 struct crypto_skcipher *null;
a5079d08
SK
339 int err;
340
341 auth = crypto_spawn_ahash(&ictx->auth);
342 if (IS_ERR(auth))
343 return PTR_ERR(auth);
344
60425a8b 345 enc = crypto_spawn_skcipher(&ictx->enc);
a5079d08
SK
346 err = PTR_ERR(enc);
347 if (IS_ERR(enc))
348 goto err_free_ahash;
349
e75445a8 350 null = crypto_get_default_null_skcipher2();
104880a6
HX
351 err = PTR_ERR(null);
352 if (IS_ERR(null))
353 goto err_free_skcipher;
354
a5079d08
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355 ctx->auth = auth;
356 ctx->enc = enc;
104880a6 357 ctx->null = null;
a5079d08 358
104880a6
HX
359 ctx->reqoff = ALIGN(2 * crypto_ahash_digestsize(auth),
360 crypto_ahash_alignmask(auth) + 1);
a5079d08 361
104880a6
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362 crypto_aead_set_reqsize(
363 tfm,
6650d09b
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364 sizeof(struct authenc_esn_request_ctx) +
365 ctx->reqoff +
366 max_t(unsigned int,
e75445a8
HX
367 crypto_ahash_reqsize(auth) +
368 sizeof(struct ahash_request),
369 sizeof(struct skcipher_request) +
370 crypto_skcipher_reqsize(enc)));
a5079d08
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371
372 return 0;
373
104880a6 374err_free_skcipher:
e75445a8 375 crypto_free_skcipher(enc);
a5079d08
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376err_free_ahash:
377 crypto_free_ahash(auth);
378 return err;
379}
380
104880a6 381static void crypto_authenc_esn_exit_tfm(struct crypto_aead *tfm)
a5079d08 382{
104880a6 383 struct crypto_authenc_esn_ctx *ctx = crypto_aead_ctx(tfm);
a5079d08
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384
385 crypto_free_ahash(ctx->auth);
e75445a8
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386 crypto_free_skcipher(ctx->enc);
387 crypto_put_default_null_skcipher2();
104880a6
HX
388}
389
390static void crypto_authenc_esn_free(struct aead_instance *inst)
391{
392 struct authenc_esn_instance_ctx *ctx = aead_instance_ctx(inst);
393
394 crypto_drop_skcipher(&ctx->enc);
395 crypto_drop_ahash(&ctx->auth);
396 kfree(inst);
a5079d08
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397}
398
104880a6
HX
399static int crypto_authenc_esn_create(struct crypto_template *tmpl,
400 struct rtattr **tb)
a5079d08
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401{
402 struct crypto_attr_type *algt;
104880a6 403 struct aead_instance *inst;
a5079d08
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404 struct hash_alg_common *auth;
405 struct crypto_alg *auth_base;
e75445a8 406 struct skcipher_alg *enc;
a5079d08
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407 struct authenc_esn_instance_ctx *ctx;
408 const char *enc_name;
409 int err;
410
411 algt = crypto_get_attr_type(tb);
a5079d08 412 if (IS_ERR(algt))
104880a6 413 return PTR_ERR(algt);
a5079d08 414
5e4b8c1f 415 if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
104880a6 416 return -EINVAL;
a5079d08
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417
418 auth = ahash_attr_alg(tb[1], CRYPTO_ALG_TYPE_HASH,
927ef32d
HX
419 CRYPTO_ALG_TYPE_AHASH_MASK |
420 crypto_requires_sync(algt->type, algt->mask));
a5079d08 421 if (IS_ERR(auth))
104880a6 422 return PTR_ERR(auth);
a5079d08
SK
423
424 auth_base = &auth->base;
425
426 enc_name = crypto_attr_alg_name(tb[2]);
427 err = PTR_ERR(enc_name);
428 if (IS_ERR(enc_name))
429 goto out_put_auth;
430
431 inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
432 err = -ENOMEM;
433 if (!inst)
434 goto out_put_auth;
435
104880a6 436 ctx = aead_instance_ctx(inst);
a5079d08 437
104880a6
HX
438 err = crypto_init_ahash_spawn(&ctx->auth, auth,
439 aead_crypto_instance(inst));
a5079d08
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440 if (err)
441 goto err_free_inst;
442
104880a6 443 crypto_set_skcipher_spawn(&ctx->enc, aead_crypto_instance(inst));
a35528ec
EB
444 err = crypto_grab_skcipher(&ctx->enc, enc_name, 0,
445 crypto_requires_sync(algt->type,
446 algt->mask));
a5079d08
SK
447 if (err)
448 goto err_drop_auth;
449
e75445a8 450 enc = crypto_spawn_skcipher_alg(&ctx->enc);
a5079d08
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451
452 err = -ENAMETOOLONG;
104880a6
HX
453 if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
454 "authencesn(%s,%s)", auth_base->cra_name,
e75445a8 455 enc->base.cra_name) >= CRYPTO_MAX_ALG_NAME)
a5079d08
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456 goto err_drop_enc;
457
104880a6 458 if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
a5079d08 459 "authencesn(%s,%s)", auth_base->cra_driver_name,
e75445a8 460 enc->base.cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
a5079d08
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461 goto err_drop_enc;
462
e75445a8
HX
463 inst->alg.base.cra_flags = (auth_base->cra_flags |
464 enc->base.cra_flags) & CRYPTO_ALG_ASYNC;
465 inst->alg.base.cra_priority = enc->base.cra_priority * 10 +
104880a6 466 auth_base->cra_priority;
e75445a8 467 inst->alg.base.cra_blocksize = enc->base.cra_blocksize;
104880a6 468 inst->alg.base.cra_alignmask = auth_base->cra_alignmask |
e75445a8 469 enc->base.cra_alignmask;
104880a6
HX
470 inst->alg.base.cra_ctxsize = sizeof(struct crypto_authenc_esn_ctx);
471
e75445a8
HX
472 inst->alg.ivsize = crypto_skcipher_alg_ivsize(enc);
473 inst->alg.chunksize = crypto_skcipher_alg_chunksize(enc);
104880a6 474 inst->alg.maxauthsize = auth->digestsize;
a5079d08 475
104880a6
HX
476 inst->alg.init = crypto_authenc_esn_init_tfm;
477 inst->alg.exit = crypto_authenc_esn_exit_tfm;
a5079d08 478
104880a6
HX
479 inst->alg.setkey = crypto_authenc_esn_setkey;
480 inst->alg.setauthsize = crypto_authenc_esn_setauthsize;
481 inst->alg.encrypt = crypto_authenc_esn_encrypt;
482 inst->alg.decrypt = crypto_authenc_esn_decrypt;
a5079d08 483
104880a6 484 inst->free = crypto_authenc_esn_free,
a5079d08 485
104880a6
HX
486 err = aead_register_instance(tmpl, inst);
487 if (err)
488 goto err_drop_enc;
a5079d08
SK
489
490out:
491 crypto_mod_put(auth_base);
104880a6 492 return err;
a5079d08
SK
493
494err_drop_enc:
495 crypto_drop_skcipher(&ctx->enc);
496err_drop_auth:
497 crypto_drop_ahash(&ctx->auth);
498err_free_inst:
499 kfree(inst);
500out_put_auth:
a5079d08
SK
501 goto out;
502}
503
a5079d08
SK
504static struct crypto_template crypto_authenc_esn_tmpl = {
505 .name = "authencesn",
104880a6 506 .create = crypto_authenc_esn_create,
a5079d08
SK
507 .module = THIS_MODULE,
508};
509
510static int __init crypto_authenc_esn_module_init(void)
511{
512 return crypto_register_template(&crypto_authenc_esn_tmpl);
513}
514
515static void __exit crypto_authenc_esn_module_exit(void)
516{
517 crypto_unregister_template(&crypto_authenc_esn_tmpl);
518}
519
520module_init(crypto_authenc_esn_module_init);
521module_exit(crypto_authenc_esn_module_exit);
522
523MODULE_LICENSE("GPL");
524MODULE_AUTHOR("Steffen Klassert <steffen.klassert@secunet.com>");
525MODULE_DESCRIPTION("AEAD wrapper for IPsec with extended sequence numbers");
4943ba16 526MODULE_ALIAS_CRYPTO("authencesn");