1 // SPDX-License-Identifier: GPL-2.0-or-later <<
2 /* 1 /*
3 * Cryptographic API. 2 * Cryptographic API.
4 * 3 *
5 * HMAC: Keyed-Hashing for Message Authenticat 4 * HMAC: Keyed-Hashing for Message Authentication (RFC2104).
6 * 5 *
7 * Copyright (c) 2002 James Morris <jmorris@in 6 * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
8 * Copyright (c) 2006 Herbert Xu <herbert@gond 7 * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
9 * 8 *
10 * The HMAC implementation is derived from USA 9 * The HMAC implementation is derived from USAGI.
11 * Copyright (c) 2002 Kazunori Miyazawa <miyaz 10 * Copyright (c) 2002 Kazunori Miyazawa <miyazawa@linux-ipv6.org> / USAGI
>> 11 *
>> 12 * This program is free software; you can redistribute it and/or modify it
>> 13 * under the terms of the GNU General Public License as published by the Free
>> 14 * Software Foundation; either version 2 of the License, or (at your option)
>> 15 * any later version.
>> 16 *
12 */ 17 */
13 18
14 #include <crypto/hmac.h> <<
15 #include <crypto/internal/hash.h> 19 #include <crypto/internal/hash.h>
16 #include <crypto/scatterwalk.h> 20 #include <crypto/scatterwalk.h>
17 #include <linux/err.h> 21 #include <linux/err.h>
18 #include <linux/fips.h> <<
19 #include <linux/init.h> 22 #include <linux/init.h>
20 #include <linux/kernel.h> 23 #include <linux/kernel.h>
21 #include <linux/module.h> 24 #include <linux/module.h>
22 #include <linux/scatterlist.h> 25 #include <linux/scatterlist.h>
23 #include <linux/string.h> 26 #include <linux/string.h>
24 27
25 struct hmac_ctx { 28 struct hmac_ctx {
26 struct crypto_shash *hash; 29 struct crypto_shash *hash;
27 /* Contains 'u8 ipad[statesize];', the <<
28 u8 pads[]; <<
29 }; 30 };
30 31
>> 32 static inline void *align_ptr(void *p, unsigned int align)
>> 33 {
>> 34 return (void *)ALIGN((unsigned long)p, align);
>> 35 }
>> 36
>> 37 static inline struct hmac_ctx *hmac_ctx(struct crypto_shash *tfm)
>> 38 {
>> 39 return align_ptr(crypto_shash_ctx_aligned(tfm) +
>> 40 crypto_shash_statesize(tfm) * 2,
>> 41 crypto_tfm_ctx_alignment());
>> 42 }
>> 43
31 static int hmac_setkey(struct crypto_shash *pa 44 static int hmac_setkey(struct crypto_shash *parent,
32 const u8 *inkey, unsign 45 const u8 *inkey, unsigned int keylen)
33 { 46 {
34 int bs = crypto_shash_blocksize(parent 47 int bs = crypto_shash_blocksize(parent);
35 int ds = crypto_shash_digestsize(paren 48 int ds = crypto_shash_digestsize(parent);
36 int ss = crypto_shash_statesize(parent 49 int ss = crypto_shash_statesize(parent);
37 struct hmac_ctx *tctx = crypto_shash_c !! 50 char *ipad = crypto_shash_ctx_aligned(parent);
38 struct crypto_shash *hash = tctx->hash !! 51 char *opad = ipad + ss;
39 u8 *ipad = &tctx->pads[0]; !! 52 struct hmac_ctx *ctx = align_ptr(opad + ss,
40 u8 *opad = &tctx->pads[ss]; !! 53 crypto_tfm_ctx_alignment());
41 SHASH_DESC_ON_STACK(shash, hash); !! 54 struct crypto_shash *hash = ctx->hash;
>> 55 struct {
>> 56 struct shash_desc shash;
>> 57 char ctx[crypto_shash_descsize(hash)];
>> 58 } desc;
42 unsigned int i; 59 unsigned int i;
43 60
44 if (fips_enabled && (keylen < 112 / 8) !! 61 desc.shash.tfm = hash;
45 return -EINVAL; !! 62 desc.shash.flags = crypto_shash_get_flags(parent) &
46 !! 63 CRYPTO_TFM_REQ_MAY_SLEEP;
47 shash->tfm = hash; <<
48 64
49 if (keylen > bs) { 65 if (keylen > bs) {
50 int err; 66 int err;
51 67
52 err = crypto_shash_digest(shas !! 68 err = crypto_shash_digest(&desc.shash, inkey, keylen, ipad);
53 if (err) 69 if (err)
54 return err; 70 return err;
55 71
56 keylen = ds; 72 keylen = ds;
57 } else 73 } else
58 memcpy(ipad, inkey, keylen); 74 memcpy(ipad, inkey, keylen);
59 75
60 memset(ipad + keylen, 0, bs - keylen); 76 memset(ipad + keylen, 0, bs - keylen);
61 memcpy(opad, ipad, bs); 77 memcpy(opad, ipad, bs);
62 78
63 for (i = 0; i < bs; i++) { 79 for (i = 0; i < bs; i++) {
64 ipad[i] ^= HMAC_IPAD_VALUE; !! 80 ipad[i] ^= 0x36;
65 opad[i] ^= HMAC_OPAD_VALUE; !! 81 opad[i] ^= 0x5c;
66 } 82 }
67 83
68 return crypto_shash_init(shash) ?: !! 84 return crypto_shash_init(&desc.shash) ?:
69 crypto_shash_update(shash, ipad !! 85 crypto_shash_update(&desc.shash, ipad, bs) ?:
70 crypto_shash_export(shash, ipad !! 86 crypto_shash_export(&desc.shash, ipad) ?:
71 crypto_shash_init(shash) ?: !! 87 crypto_shash_init(&desc.shash) ?:
72 crypto_shash_update(shash, opad !! 88 crypto_shash_update(&desc.shash, opad, bs) ?:
73 crypto_shash_export(shash, opad !! 89 crypto_shash_export(&desc.shash, opad);
74 } 90 }
75 91
76 static int hmac_export(struct shash_desc *pdes 92 static int hmac_export(struct shash_desc *pdesc, void *out)
77 { 93 {
78 struct shash_desc *desc = shash_desc_c 94 struct shash_desc *desc = shash_desc_ctx(pdesc);
79 95
>> 96 desc->flags = pdesc->flags & CRYPTO_TFM_REQ_MAY_SLEEP;
>> 97
80 return crypto_shash_export(desc, out); 98 return crypto_shash_export(desc, out);
81 } 99 }
82 100
83 static int hmac_import(struct shash_desc *pdes 101 static int hmac_import(struct shash_desc *pdesc, const void *in)
84 { 102 {
85 struct shash_desc *desc = shash_desc_c 103 struct shash_desc *desc = shash_desc_ctx(pdesc);
86 const struct hmac_ctx *tctx = crypto_s !! 104 struct hmac_ctx *ctx = hmac_ctx(pdesc->tfm);
87 105
88 desc->tfm = tctx->hash; !! 106 desc->tfm = ctx->hash;
>> 107 desc->flags = pdesc->flags & CRYPTO_TFM_REQ_MAY_SLEEP;
89 108
90 return crypto_shash_import(desc, in); 109 return crypto_shash_import(desc, in);
91 } 110 }
92 111
93 static int hmac_init(struct shash_desc *pdesc) 112 static int hmac_init(struct shash_desc *pdesc)
94 { 113 {
95 const struct hmac_ctx *tctx = crypto_s !! 114 return hmac_import(pdesc, crypto_shash_ctx_aligned(pdesc->tfm));
96 <<
97 return hmac_import(pdesc, &tctx->pads[ <<
98 } 115 }
99 116
100 static int hmac_update(struct shash_desc *pdes 117 static int hmac_update(struct shash_desc *pdesc,
101 const u8 *data, unsigne 118 const u8 *data, unsigned int nbytes)
102 { 119 {
103 struct shash_desc *desc = shash_desc_c 120 struct shash_desc *desc = shash_desc_ctx(pdesc);
104 121
>> 122 desc->flags = pdesc->flags & CRYPTO_TFM_REQ_MAY_SLEEP;
>> 123
105 return crypto_shash_update(desc, data, 124 return crypto_shash_update(desc, data, nbytes);
106 } 125 }
107 126
108 static int hmac_final(struct shash_desc *pdesc 127 static int hmac_final(struct shash_desc *pdesc, u8 *out)
109 { 128 {
110 struct crypto_shash *parent = pdesc->t 129 struct crypto_shash *parent = pdesc->tfm;
111 int ds = crypto_shash_digestsize(paren 130 int ds = crypto_shash_digestsize(parent);
112 int ss = crypto_shash_statesize(parent 131 int ss = crypto_shash_statesize(parent);
113 const struct hmac_ctx *tctx = crypto_s !! 132 char *opad = crypto_shash_ctx_aligned(parent) + ss;
114 const u8 *opad = &tctx->pads[ss]; <<
115 struct shash_desc *desc = shash_desc_c 133 struct shash_desc *desc = shash_desc_ctx(pdesc);
116 134
>> 135 desc->flags = pdesc->flags & CRYPTO_TFM_REQ_MAY_SLEEP;
>> 136
117 return crypto_shash_final(desc, out) ? 137 return crypto_shash_final(desc, out) ?:
118 crypto_shash_import(desc, opad) 138 crypto_shash_import(desc, opad) ?:
119 crypto_shash_finup(desc, out, d 139 crypto_shash_finup(desc, out, ds, out);
120 } 140 }
121 141
122 static int hmac_finup(struct shash_desc *pdesc 142 static int hmac_finup(struct shash_desc *pdesc, const u8 *data,
123 unsigned int nbytes, u8 143 unsigned int nbytes, u8 *out)
124 { 144 {
125 145
126 struct crypto_shash *parent = pdesc->t 146 struct crypto_shash *parent = pdesc->tfm;
127 int ds = crypto_shash_digestsize(paren 147 int ds = crypto_shash_digestsize(parent);
128 int ss = crypto_shash_statesize(parent 148 int ss = crypto_shash_statesize(parent);
129 const struct hmac_ctx *tctx = crypto_s !! 149 char *opad = crypto_shash_ctx_aligned(parent) + ss;
130 const u8 *opad = &tctx->pads[ss]; <<
131 struct shash_desc *desc = shash_desc_c 150 struct shash_desc *desc = shash_desc_ctx(pdesc);
132 151
>> 152 desc->flags = pdesc->flags & CRYPTO_TFM_REQ_MAY_SLEEP;
>> 153
133 return crypto_shash_finup(desc, data, 154 return crypto_shash_finup(desc, data, nbytes, out) ?:
134 crypto_shash_import(desc, opad) 155 crypto_shash_import(desc, opad) ?:
135 crypto_shash_finup(desc, out, d 156 crypto_shash_finup(desc, out, ds, out);
136 } 157 }
137 158
138 static int hmac_init_tfm(struct crypto_shash * !! 159 static int hmac_init_tfm(struct crypto_tfm *tfm)
139 { 160 {
>> 161 struct crypto_shash *parent = __crypto_shash_cast(tfm);
140 struct crypto_shash *hash; 162 struct crypto_shash *hash;
141 struct shash_instance *inst = shash_al !! 163 struct crypto_instance *inst = (void *)tfm->__crt_alg;
142 struct crypto_shash_spawn *spawn = sha !! 164 struct crypto_shash_spawn *spawn = crypto_instance_ctx(inst);
143 struct hmac_ctx *tctx = crypto_shash_c !! 165 struct hmac_ctx *ctx = hmac_ctx(parent);
144 166
145 hash = crypto_spawn_shash(spawn); 167 hash = crypto_spawn_shash(spawn);
146 if (IS_ERR(hash)) 168 if (IS_ERR(hash))
147 return PTR_ERR(hash); 169 return PTR_ERR(hash);
148 170
149 parent->descsize = sizeof(struct shash 171 parent->descsize = sizeof(struct shash_desc) +
150 crypto_shash_descsi 172 crypto_shash_descsize(hash);
151 173
152 tctx->hash = hash; !! 174 ctx->hash = hash;
153 return 0; 175 return 0;
154 } 176 }
155 177
156 static int hmac_clone_tfm(struct crypto_shash !! 178 static void hmac_exit_tfm(struct crypto_tfm *tfm)
157 { 179 {
158 struct hmac_ctx *sctx = crypto_shash_c !! 180 struct hmac_ctx *ctx = hmac_ctx(__crypto_shash_cast(tfm));
159 struct hmac_ctx *dctx = crypto_shash_c !! 181 crypto_free_shash(ctx->hash);
160 struct crypto_shash *hash; <<
161 <<
162 hash = crypto_clone_shash(sctx->hash); <<
163 if (IS_ERR(hash)) <<
164 return PTR_ERR(hash); <<
165 <<
166 dctx->hash = hash; <<
167 return 0; <<
168 } <<
169 <<
170 static void hmac_exit_tfm(struct crypto_shash <<
171 { <<
172 struct hmac_ctx *tctx = crypto_shash_c <<
173 <<
174 crypto_free_shash(tctx->hash); <<
175 } 182 }
176 183
177 static int hmac_create(struct crypto_template 184 static int hmac_create(struct crypto_template *tmpl, struct rtattr **tb)
178 { 185 {
179 struct shash_instance *inst; 186 struct shash_instance *inst;
180 struct crypto_shash_spawn *spawn; <<
181 struct crypto_alg *alg; 187 struct crypto_alg *alg;
182 struct shash_alg *salg; 188 struct shash_alg *salg;
183 u32 mask; <<
184 int err; 189 int err;
185 int ds; 190 int ds;
186 int ss; 191 int ss;
187 192
188 err = crypto_check_attr_type(tb, CRYPT !! 193 err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_SHASH);
189 if (err) 194 if (err)
190 return err; 195 return err;
191 196
192 inst = kzalloc(sizeof(*inst) + sizeof( !! 197 salg = shash_attr_alg(tb[1], 0, 0);
193 if (!inst) !! 198 if (IS_ERR(salg))
194 return -ENOMEM; !! 199 return PTR_ERR(salg);
195 spawn = shash_instance_ctx(inst); <<
196 <<
197 err = crypto_grab_shash(spawn, shash_c <<
198 crypto_attr_al <<
199 if (err) <<
200 goto err_free_inst; <<
201 salg = crypto_spawn_shash_alg(spawn); <<
202 alg = &salg->base; <<
203 200
204 /* The underlying hash algorithm must <<
205 err = -EINVAL; 201 err = -EINVAL;
206 if (crypto_shash_alg_needs_key(salg)) <<
207 goto err_free_inst; <<
208 <<
209 ds = salg->digestsize; 202 ds = salg->digestsize;
210 ss = salg->statesize; 203 ss = salg->statesize;
>> 204 alg = &salg->base;
211 if (ds > alg->cra_blocksize || 205 if (ds > alg->cra_blocksize ||
212 ss < alg->cra_blocksize) 206 ss < alg->cra_blocksize)
213 goto err_free_inst; !! 207 goto out_put_alg;
214 208
215 err = crypto_inst_setname(shash_crypto !! 209 inst = shash_alloc_instance("hmac", alg);
>> 210 err = PTR_ERR(inst);
>> 211 if (IS_ERR(inst))
>> 212 goto out_put_alg;
>> 213
>> 214 err = crypto_init_shash_spawn(shash_instance_ctx(inst), salg,
>> 215 shash_crypto_instance(inst));
216 if (err) 216 if (err)
217 goto err_free_inst; !! 217 goto out_free_inst;
218 218
219 inst->alg.base.cra_priority = alg->cra 219 inst->alg.base.cra_priority = alg->cra_priority;
220 inst->alg.base.cra_blocksize = alg->cr 220 inst->alg.base.cra_blocksize = alg->cra_blocksize;
221 inst->alg.base.cra_ctxsize = sizeof(st !! 221 inst->alg.base.cra_alignmask = alg->cra_alignmask;
222 222
>> 223 ss = ALIGN(ss, alg->cra_alignmask + 1);
223 inst->alg.digestsize = ds; 224 inst->alg.digestsize = ds;
224 inst->alg.statesize = ss; 225 inst->alg.statesize = ss;
>> 226
>> 227 inst->alg.base.cra_ctxsize = sizeof(struct hmac_ctx) +
>> 228 ALIGN(ss * 2, crypto_tfm_ctx_alignment());
>> 229
>> 230 inst->alg.base.cra_init = hmac_init_tfm;
>> 231 inst->alg.base.cra_exit = hmac_exit_tfm;
>> 232
225 inst->alg.init = hmac_init; 233 inst->alg.init = hmac_init;
226 inst->alg.update = hmac_update; 234 inst->alg.update = hmac_update;
227 inst->alg.final = hmac_final; 235 inst->alg.final = hmac_final;
228 inst->alg.finup = hmac_finup; 236 inst->alg.finup = hmac_finup;
229 inst->alg.export = hmac_export; 237 inst->alg.export = hmac_export;
230 inst->alg.import = hmac_import; 238 inst->alg.import = hmac_import;
231 inst->alg.setkey = hmac_setkey; 239 inst->alg.setkey = hmac_setkey;
232 inst->alg.init_tfm = hmac_init_tfm; <<
233 inst->alg.clone_tfm = hmac_clone_tfm; <<
234 inst->alg.exit_tfm = hmac_exit_tfm; <<
235 <<
236 inst->free = shash_free_singlespawn_in <<
237 240
238 err = shash_register_instance(tmpl, in 241 err = shash_register_instance(tmpl, inst);
239 if (err) { 242 if (err) {
240 err_free_inst: !! 243 out_free_inst:
241 shash_free_singlespawn_instanc !! 244 shash_free_instance(shash_crypto_instance(inst));
242 } 245 }
>> 246
>> 247 out_put_alg:
>> 248 crypto_mod_put(alg);
243 return err; 249 return err;
244 } 250 }
245 251
246 static struct crypto_template hmac_tmpl = { 252 static struct crypto_template hmac_tmpl = {
247 .name = "hmac", 253 .name = "hmac",
248 .create = hmac_create, 254 .create = hmac_create,
>> 255 .free = shash_free_instance,
249 .module = THIS_MODULE, 256 .module = THIS_MODULE,
250 }; 257 };
251 258
252 static int __init hmac_module_init(void) 259 static int __init hmac_module_init(void)
253 { 260 {
254 return crypto_register_template(&hmac_ 261 return crypto_register_template(&hmac_tmpl);
255 } 262 }
256 263
257 static void __exit hmac_module_exit(void) 264 static void __exit hmac_module_exit(void)
258 { 265 {
259 crypto_unregister_template(&hmac_tmpl) 266 crypto_unregister_template(&hmac_tmpl);
260 } 267 }
261 268
262 subsys_initcall(hmac_module_init); !! 269 module_init(hmac_module_init);
263 module_exit(hmac_module_exit); 270 module_exit(hmac_module_exit);
264 271
265 MODULE_LICENSE("GPL"); 272 MODULE_LICENSE("GPL");
266 MODULE_DESCRIPTION("HMAC hash algorithm"); 273 MODULE_DESCRIPTION("HMAC hash algorithm");
267 MODULE_ALIAS_CRYPTO("hmac"); 274 MODULE_ALIAS_CRYPTO("hmac");
268 275
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