2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2008 Isilon Inc http://www.isilon.com/
5 * Authors: Doug Rabson <dfr@rabson.org>
6 * Developed with Red Inc: Alfred Perlstein <alfred@freebsd.org>
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 #include <sys/cdefs.h>
31 __FBSDID("$FreeBSD$");
33 #include <sys/param.h>
35 #include <sys/malloc.h>
36 #include <sys/mutex.h>
39 #include <opencrypto/cryptodev.h>
41 #include <kgssapi/gssapi.h>
42 #include <kgssapi/gssapi_impl.h>
48 crypto_session_t as_session_aes;
49 crypto_session_t as_session_sha1;
53 aes_init(struct krb5_key_state *ks)
57 as = malloc(sizeof(struct aes_state), M_GSSAPI, M_WAITOK|M_ZERO);
58 mtx_init(&as->as_lock, "gss aes lock", NULL, MTX_DEF);
63 aes_destroy(struct krb5_key_state *ks)
65 struct aes_state *as = ks->ks_priv;
67 if (as->as_session_aes != 0)
68 crypto_freesession(as->as_session_aes);
69 if (as->as_session_sha1 != 0)
70 crypto_freesession(as->as_session_sha1);
71 mtx_destroy(&as->as_lock);
72 free(ks->ks_priv, M_GSSAPI);
76 aes_set_key(struct krb5_key_state *ks, const void *in)
78 void *kp = ks->ks_key;
79 struct aes_state *as = ks->ks_priv;
83 bcopy(in, kp, ks->ks_class->ec_keylen);
85 if (as->as_session_aes != 0)
86 crypto_freesession(as->as_session_aes);
87 if (as->as_session_sha1 != 0)
88 crypto_freesession(as->as_session_sha1);
91 * We only want the first 96 bits of the HMAC.
93 bzero(&cri, sizeof(cri));
94 cri.cri_alg = CRYPTO_SHA1_HMAC;
95 cri.cri_klen = ks->ks_class->ec_keybits;
97 cri.cri_key = ks->ks_key;
99 crypto_newsession(&as->as_session_sha1, &cri,
100 CRYPTOCAP_F_HARDWARE | CRYPTOCAP_F_SOFTWARE);
102 bzero(&cri, sizeof(cri));
103 cri.cri_alg = CRYPTO_AES_CBC;
104 cri.cri_klen = ks->ks_class->ec_keybits;
106 cri.cri_key = ks->ks_key;
108 crypto_newsession(&as->as_session_aes, &cri,
109 CRYPTOCAP_F_HARDWARE | CRYPTOCAP_F_SOFTWARE);
113 aes_random_to_key(struct krb5_key_state *ks, const void *in)
120 aes_crypto_cb(struct cryptop *crp)
123 struct aes_state *as = (struct aes_state *) crp->crp_opaque;
125 if (crypto_ses2caps(crp->crp_session) & CRYPTOCAP_F_SYNC)
128 error = crp->crp_etype;
130 error = crypto_dispatch(crp);
131 mtx_lock(&as->as_lock);
132 if (error || (crp->crp_flags & CRYPTO_F_DONE))
134 mtx_unlock(&as->as_lock);
140 aes_encrypt_1(const struct krb5_key_state *ks, int buftype, void *buf,
141 size_t skip, size_t len, void *ivec, int encdec)
143 struct aes_state *as = ks->ks_priv;
145 struct cryptodesc *crd;
148 crp = crypto_getreq(1);
151 crd->crd_skip = skip;
153 crd->crd_flags = CRD_F_IV_EXPLICIT | CRD_F_IV_PRESENT | encdec;
155 bcopy(ivec, crd->crd_iv, 16);
157 bzero(crd->crd_iv, 16);
159 crd->crd_next = NULL;
160 crd->crd_alg = CRYPTO_AES_CBC;
162 crp->crp_session = as->as_session_aes;
163 crp->crp_flags = buftype | CRYPTO_F_CBIFSYNC;
165 crp->crp_opaque = (void *) as;
166 crp->crp_callback = aes_crypto_cb;
168 error = crypto_dispatch(crp);
170 if ((crypto_ses2caps(as->as_session_aes) & CRYPTOCAP_F_SYNC) == 0) {
171 mtx_lock(&as->as_lock);
172 if (!error && !(crp->crp_flags & CRYPTO_F_DONE))
173 error = msleep(crp, &as->as_lock, 0, "gssaes", 0);
174 mtx_unlock(&as->as_lock);
181 aes_encrypt(const struct krb5_key_state *ks, struct mbuf *inout,
182 size_t skip, size_t len, void *ivec, size_t ivlen)
184 size_t blocklen = 16, plen;
186 uint8_t cn_1[16], cn[16];
191 * AES encryption with cyphertext stealing:
193 * CTSencrypt(P[0], ..., P[n], IV, K):
195 * (C[0], ..., C[n-2], E[n-1]) =
196 * CBCencrypt(P[0], ..., P[n-1], IV, K)
197 * P = pad(P[n], 0, blocksize)
198 * E[n] = CBCencrypt(P, E[n-1], K);
200 * C[n] = E[n-1]{0..len-1}
202 plen = len % blocklen;
203 if (len == blocklen) {
205 * Note: caller will ensure len >= blocklen.
207 aes_encrypt_1(ks, CRYPTO_F_IMBUF, inout, skip, len, ivec,
209 } else if (plen == 0) {
211 * This is equivalent to CBC mode followed by swapping
212 * the last two blocks. We assume that neither of the
213 * last two blocks cross iov boundaries.
215 aes_encrypt_1(ks, CRYPTO_F_IMBUF, inout, skip, len, ivec,
217 off = skip + len - 2 * blocklen;
218 m_copydata(inout, off, 2 * blocklen, (void*) &last2);
219 m_copyback(inout, off, blocklen, last2.cn);
220 m_copyback(inout, off + blocklen, blocklen, last2.cn_1);
223 * This is the difficult case. We encrypt all but the
224 * last partial block first. We then create a padded
225 * copy of the last block and encrypt that using the
226 * second to last encrypted block as IV. Once we have
227 * the encrypted versions of the last two blocks, we
228 * reshuffle to create the final result.
230 aes_encrypt_1(ks, CRYPTO_F_IMBUF, inout, skip, len - plen,
231 ivec, CRD_F_ENCRYPT);
234 * Copy out the last two blocks, pad the last block
235 * and encrypt it. Rearrange to get the final
236 * result. The cyphertext for cn_1 is in cn. The
237 * cyphertext for cn is the first plen bytes of what
240 off = skip + len - blocklen - plen;
241 m_copydata(inout, off, blocklen + plen, (void*) &last2);
242 for (i = plen; i < blocklen; i++)
244 aes_encrypt_1(ks, 0, last2.cn, 0, blocklen, last2.cn_1,
246 m_copyback(inout, off, blocklen, last2.cn);
247 m_copyback(inout, off + blocklen, plen, last2.cn_1);
252 aes_decrypt(const struct krb5_key_state *ks, struct mbuf *inout,
253 size_t skip, size_t len, void *ivec, size_t ivlen)
255 size_t blocklen = 16, plen;
257 uint8_t cn_1[16], cn[16];
262 * AES decryption with cyphertext stealing:
264 * CTSencrypt(C[0], ..., C[n], IV, K):
267 * X = decrypt(E[n], K)
268 * P[n] = (X ^ C[n]){0..len-1}
269 * E[n-1] = {C[n,0],...,C[n,len-1],X[len],...,X[blocksize-1]}
270 * (P[0],...,P[n-1]) = CBCdecrypt(C[0],...,C[n-2],E[n-1], IV, K)
272 plen = len % blocklen;
273 if (len == blocklen) {
275 * Note: caller will ensure len >= blocklen.
277 aes_encrypt_1(ks, CRYPTO_F_IMBUF, inout, skip, len, ivec, 0);
278 } else if (plen == 0) {
280 * This is equivalent to CBC mode followed by swapping
281 * the last two blocks.
283 off = skip + len - 2 * blocklen;
284 m_copydata(inout, off, 2 * blocklen, (void*) &last2);
285 m_copyback(inout, off, blocklen, last2.cn);
286 m_copyback(inout, off + blocklen, blocklen, last2.cn_1);
287 aes_encrypt_1(ks, CRYPTO_F_IMBUF, inout, skip, len, ivec, 0);
290 * This is the difficult case. We first decrypt the
291 * second to last block with a zero IV to make X. The
292 * plaintext for the last block is the XOR of X and
293 * the last cyphertext block.
295 * We derive a new cypher text for the second to last
296 * block by mixing the unused bytes of X with the last
297 * cyphertext block. The result of that can be
298 * decrypted with the rest in CBC mode.
300 off = skip + len - plen - blocklen;
301 aes_encrypt_1(ks, CRYPTO_F_IMBUF, inout, off, blocklen,
303 m_copydata(inout, off, blocklen + plen, (void*) &last2);
305 for (i = 0; i < plen; i++) {
307 last2.cn[i] ^= last2.cn_1[i];
311 m_copyback(inout, off, blocklen + plen, (void*) &last2);
312 aes_encrypt_1(ks, CRYPTO_F_IMBUF, inout, skip, len - plen,
319 aes_checksum(const struct krb5_key_state *ks, int usage,
320 struct mbuf *inout, size_t skip, size_t inlen, size_t outlen)
322 struct aes_state *as = ks->ks_priv;
324 struct cryptodesc *crd;
327 crp = crypto_getreq(1);
330 crd->crd_skip = skip;
331 crd->crd_len = inlen;
332 crd->crd_inject = skip + inlen;
334 crd->crd_next = NULL;
335 crd->crd_alg = CRYPTO_SHA1_HMAC;
337 crp->crp_session = as->as_session_sha1;
338 crp->crp_ilen = inlen;
341 crp->crp_flags = CRYPTO_F_IMBUF | CRYPTO_F_CBIFSYNC;
342 crp->crp_buf = (void *) inout;
343 crp->crp_opaque = (void *) as;
344 crp->crp_callback = aes_crypto_cb;
346 error = crypto_dispatch(crp);
348 if ((crypto_ses2caps(as->as_session_sha1) & CRYPTOCAP_F_SYNC) == 0) {
349 mtx_lock(&as->as_lock);
350 if (!error && !(crp->crp_flags & CRYPTO_F_DONE))
351 error = msleep(crp, &as->as_lock, 0, "gssaes", 0);
352 mtx_unlock(&as->as_lock);
358 struct krb5_encryption_class krb5_aes128_encryption_class = {
359 "aes128-cts-hmac-sha1-96", /* name */
360 ETYPE_AES128_CTS_HMAC_SHA1_96, /* etype */
361 EC_DERIVED_KEYS, /* flags */
364 12, /* checksumlen */
376 struct krb5_encryption_class krb5_aes256_encryption_class = {
377 "aes256-cts-hmac-sha1-96", /* name */
378 ETYPE_AES256_CTS_HMAC_SHA1_96, /* etype */
379 EC_DERIVED_KEYS, /* flags */
382 12, /* checksumlen */