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