Thomas Gleixner | 2874c5f | 2019-05-27 08:55:01 +0200 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | /* |
| 3 | * Cryptographic API. |
| 4 | * |
| 5 | * HMAC: Keyed-Hashing for Message Authentication (RFC2104). |
| 6 | * |
| 7 | * Copyright (c) 2002 James Morris <jmorris@intercode.com.au> |
Herbert Xu | 0796ae0 | 2006-08-21 20:50:52 +1000 | [diff] [blame] | 8 | * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 9 | * |
| 10 | * The HMAC implementation is derived from USAGI. |
| 11 | * Copyright (c) 2002 Kazunori Miyazawa <miyazawa@linux-ipv6.org> / USAGI |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 12 | */ |
Herbert Xu | 0796ae0 | 2006-08-21 20:50:52 +1000 | [diff] [blame] | 13 | |
Corentin LABBE | 03d7db5 | 2017-05-19 08:53:23 +0200 | [diff] [blame] | 14 | #include <crypto/hmac.h> |
Herbert Xu | 5f7082e | 2008-08-31 22:21:09 +1000 | [diff] [blame] | 15 | #include <crypto/internal/hash.h> |
Herbert Xu | b2ab4a5 | 2007-12-05 20:59:25 +1100 | [diff] [blame] | 16 | #include <crypto/scatterwalk.h> |
Herbert Xu | 0796ae0 | 2006-08-21 20:50:52 +1000 | [diff] [blame] | 17 | #include <linux/err.h> |
| 18 | #include <linux/init.h> |
| 19 | #include <linux/kernel.h> |
| 20 | #include <linux/module.h> |
David Hardeman | 378f058 | 2005-09-17 17:55:31 +1000 | [diff] [blame] | 21 | #include <linux/scatterlist.h> |
Herbert Xu | 0796ae0 | 2006-08-21 20:50:52 +1000 | [diff] [blame] | 22 | #include <linux/string.h> |
| 23 | |
| 24 | struct hmac_ctx { |
Herbert Xu | 0b767b4 | 2009-07-24 15:18:41 +0800 | [diff] [blame] | 25 | struct crypto_shash *hash; |
Herbert Xu | 0796ae0 | 2006-08-21 20:50:52 +1000 | [diff] [blame] | 26 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | |
Herbert Xu | 0796ae0 | 2006-08-21 20:50:52 +1000 | [diff] [blame] | 28 | static inline void *align_ptr(void *p, unsigned int align) |
| 29 | { |
| 30 | return (void *)ALIGN((unsigned long)p, align); |
| 31 | } |
| 32 | |
Herbert Xu | 8bd1209 | 2009-07-09 12:43:37 +0800 | [diff] [blame] | 33 | static inline struct hmac_ctx *hmac_ctx(struct crypto_shash *tfm) |
Herbert Xu | 0796ae0 | 2006-08-21 20:50:52 +1000 | [diff] [blame] | 34 | { |
Herbert Xu | 8bd1209 | 2009-07-09 12:43:37 +0800 | [diff] [blame] | 35 | return align_ptr(crypto_shash_ctx_aligned(tfm) + |
Herbert Xu | 0b767b4 | 2009-07-24 15:18:41 +0800 | [diff] [blame] | 36 | crypto_shash_statesize(tfm) * 2, |
Herbert Xu | 8bd1209 | 2009-07-09 12:43:37 +0800 | [diff] [blame] | 37 | crypto_tfm_ctx_alignment()); |
Herbert Xu | 0796ae0 | 2006-08-21 20:50:52 +1000 | [diff] [blame] | 38 | } |
| 39 | |
Herbert Xu | 8bd1209 | 2009-07-09 12:43:37 +0800 | [diff] [blame] | 40 | static int hmac_setkey(struct crypto_shash *parent, |
Herbert Xu | 0796ae0 | 2006-08-21 20:50:52 +1000 | [diff] [blame] | 41 | const u8 *inkey, unsigned int keylen) |
| 42 | { |
Herbert Xu | 8bd1209 | 2009-07-09 12:43:37 +0800 | [diff] [blame] | 43 | int bs = crypto_shash_blocksize(parent); |
| 44 | int ds = crypto_shash_digestsize(parent); |
Herbert Xu | 0b767b4 | 2009-07-24 15:18:41 +0800 | [diff] [blame] | 45 | int ss = crypto_shash_statesize(parent); |
Herbert Xu | 8bd1209 | 2009-07-09 12:43:37 +0800 | [diff] [blame] | 46 | char *ipad = crypto_shash_ctx_aligned(parent); |
Herbert Xu | 0b767b4 | 2009-07-24 15:18:41 +0800 | [diff] [blame] | 47 | char *opad = ipad + ss; |
| 48 | struct hmac_ctx *ctx = align_ptr(opad + ss, |
Herbert Xu | 8bd1209 | 2009-07-09 12:43:37 +0800 | [diff] [blame] | 49 | crypto_tfm_ctx_alignment()); |
Herbert Xu | 0b767b4 | 2009-07-24 15:18:41 +0800 | [diff] [blame] | 50 | struct crypto_shash *hash = ctx->hash; |
Jan-Simon Möller | ffb32e9 | 2012-07-02 13:47:40 +0200 | [diff] [blame] | 51 | SHASH_DESC_ON_STACK(shash, hash); |
Herbert Xu | 0796ae0 | 2006-08-21 20:50:52 +1000 | [diff] [blame] | 52 | unsigned int i; |
| 53 | |
Jan-Simon Möller | ffb32e9 | 2012-07-02 13:47:40 +0200 | [diff] [blame] | 54 | shash->tfm = hash; |
Herbert Xu | 0b767b4 | 2009-07-24 15:18:41 +0800 | [diff] [blame] | 55 | |
Herbert Xu | 0796ae0 | 2006-08-21 20:50:52 +1000 | [diff] [blame] | 56 | if (keylen > bs) { |
Herbert Xu | 0796ae0 | 2006-08-21 20:50:52 +1000 | [diff] [blame] | 57 | int err; |
| 58 | |
Jan-Simon Möller | ffb32e9 | 2012-07-02 13:47:40 +0200 | [diff] [blame] | 59 | err = crypto_shash_digest(shash, inkey, keylen, ipad); |
Herbert Xu | 0796ae0 | 2006-08-21 20:50:52 +1000 | [diff] [blame] | 60 | if (err) |
| 61 | return err; |
| 62 | |
Herbert Xu | 0796ae0 | 2006-08-21 20:50:52 +1000 | [diff] [blame] | 63 | keylen = ds; |
Herbert Xu | 0b767b4 | 2009-07-24 15:18:41 +0800 | [diff] [blame] | 64 | } else |
| 65 | memcpy(ipad, inkey, keylen); |
Herbert Xu | 0796ae0 | 2006-08-21 20:50:52 +1000 | [diff] [blame] | 66 | |
Herbert Xu | 0796ae0 | 2006-08-21 20:50:52 +1000 | [diff] [blame] | 67 | memset(ipad + keylen, 0, bs - keylen); |
| 68 | memcpy(opad, ipad, bs); |
| 69 | |
| 70 | for (i = 0; i < bs; i++) { |
Corentin LABBE | 03d7db5 | 2017-05-19 08:53:23 +0200 | [diff] [blame] | 71 | ipad[i] ^= HMAC_IPAD_VALUE; |
| 72 | opad[i] ^= HMAC_OPAD_VALUE; |
Herbert Xu | 0796ae0 | 2006-08-21 20:50:52 +1000 | [diff] [blame] | 73 | } |
| 74 | |
Jan-Simon Möller | ffb32e9 | 2012-07-02 13:47:40 +0200 | [diff] [blame] | 75 | return crypto_shash_init(shash) ?: |
| 76 | crypto_shash_update(shash, ipad, bs) ?: |
| 77 | crypto_shash_export(shash, ipad) ?: |
| 78 | crypto_shash_init(shash) ?: |
| 79 | crypto_shash_update(shash, opad, bs) ?: |
| 80 | crypto_shash_export(shash, opad); |
Herbert Xu | 0b767b4 | 2009-07-24 15:18:41 +0800 | [diff] [blame] | 81 | } |
| 82 | |
| 83 | static int hmac_export(struct shash_desc *pdesc, void *out) |
| 84 | { |
| 85 | struct shash_desc *desc = shash_desc_ctx(pdesc); |
| 86 | |
Herbert Xu | 0b767b4 | 2009-07-24 15:18:41 +0800 | [diff] [blame] | 87 | return crypto_shash_export(desc, out); |
| 88 | } |
| 89 | |
| 90 | static int hmac_import(struct shash_desc *pdesc, const void *in) |
| 91 | { |
| 92 | struct shash_desc *desc = shash_desc_ctx(pdesc); |
| 93 | struct hmac_ctx *ctx = hmac_ctx(pdesc->tfm); |
| 94 | |
| 95 | desc->tfm = ctx->hash; |
Herbert Xu | 0b767b4 | 2009-07-24 15:18:41 +0800 | [diff] [blame] | 96 | |
| 97 | return crypto_shash_import(desc, in); |
Herbert Xu | 0796ae0 | 2006-08-21 20:50:52 +1000 | [diff] [blame] | 98 | } |
| 99 | |
Herbert Xu | 8bd1209 | 2009-07-09 12:43:37 +0800 | [diff] [blame] | 100 | static int hmac_init(struct shash_desc *pdesc) |
Herbert Xu | 0796ae0 | 2006-08-21 20:50:52 +1000 | [diff] [blame] | 101 | { |
Herbert Xu | 0b767b4 | 2009-07-24 15:18:41 +0800 | [diff] [blame] | 102 | return hmac_import(pdesc, crypto_shash_ctx_aligned(pdesc->tfm)); |
Herbert Xu | 0796ae0 | 2006-08-21 20:50:52 +1000 | [diff] [blame] | 103 | } |
| 104 | |
Herbert Xu | 8bd1209 | 2009-07-09 12:43:37 +0800 | [diff] [blame] | 105 | static int hmac_update(struct shash_desc *pdesc, |
| 106 | const u8 *data, unsigned int nbytes) |
Herbert Xu | 0796ae0 | 2006-08-21 20:50:52 +1000 | [diff] [blame] | 107 | { |
Herbert Xu | 8bd1209 | 2009-07-09 12:43:37 +0800 | [diff] [blame] | 108 | struct shash_desc *desc = shash_desc_ctx(pdesc); |
Herbert Xu | 0796ae0 | 2006-08-21 20:50:52 +1000 | [diff] [blame] | 109 | |
Herbert Xu | 8bd1209 | 2009-07-09 12:43:37 +0800 | [diff] [blame] | 110 | return crypto_shash_update(desc, data, nbytes); |
Herbert Xu | 0796ae0 | 2006-08-21 20:50:52 +1000 | [diff] [blame] | 111 | } |
| 112 | |
Herbert Xu | 8bd1209 | 2009-07-09 12:43:37 +0800 | [diff] [blame] | 113 | static int hmac_final(struct shash_desc *pdesc, u8 *out) |
Herbert Xu | 0796ae0 | 2006-08-21 20:50:52 +1000 | [diff] [blame] | 114 | { |
Herbert Xu | 8bd1209 | 2009-07-09 12:43:37 +0800 | [diff] [blame] | 115 | struct crypto_shash *parent = pdesc->tfm; |
Herbert Xu | 8bd1209 | 2009-07-09 12:43:37 +0800 | [diff] [blame] | 116 | int ds = crypto_shash_digestsize(parent); |
Herbert Xu | 0b767b4 | 2009-07-24 15:18:41 +0800 | [diff] [blame] | 117 | int ss = crypto_shash_statesize(parent); |
| 118 | char *opad = crypto_shash_ctx_aligned(parent) + ss; |
Herbert Xu | 8bd1209 | 2009-07-09 12:43:37 +0800 | [diff] [blame] | 119 | struct shash_desc *desc = shash_desc_ctx(pdesc); |
Herbert Xu | 0796ae0 | 2006-08-21 20:50:52 +1000 | [diff] [blame] | 120 | |
Herbert Xu | 0b767b4 | 2009-07-24 15:18:41 +0800 | [diff] [blame] | 121 | return crypto_shash_final(desc, out) ?: |
| 122 | crypto_shash_import(desc, opad) ?: |
| 123 | crypto_shash_finup(desc, out, ds, out); |
Herbert Xu | 0796ae0 | 2006-08-21 20:50:52 +1000 | [diff] [blame] | 124 | } |
| 125 | |
Herbert Xu | 8bd1209 | 2009-07-09 12:43:37 +0800 | [diff] [blame] | 126 | static int hmac_finup(struct shash_desc *pdesc, const u8 *data, |
| 127 | unsigned int nbytes, u8 *out) |
Herbert Xu | 0796ae0 | 2006-08-21 20:50:52 +1000 | [diff] [blame] | 128 | { |
Herbert Xu | 8bd1209 | 2009-07-09 12:43:37 +0800 | [diff] [blame] | 129 | |
| 130 | struct crypto_shash *parent = pdesc->tfm; |
Herbert Xu | 8bd1209 | 2009-07-09 12:43:37 +0800 | [diff] [blame] | 131 | int ds = crypto_shash_digestsize(parent); |
Herbert Xu | 0b767b4 | 2009-07-24 15:18:41 +0800 | [diff] [blame] | 132 | int ss = crypto_shash_statesize(parent); |
| 133 | char *opad = crypto_shash_ctx_aligned(parent) + ss; |
Herbert Xu | 8bd1209 | 2009-07-09 12:43:37 +0800 | [diff] [blame] | 134 | struct shash_desc *desc = shash_desc_ctx(pdesc); |
Herbert Xu | 0796ae0 | 2006-08-21 20:50:52 +1000 | [diff] [blame] | 135 | |
Herbert Xu | 0b767b4 | 2009-07-24 15:18:41 +0800 | [diff] [blame] | 136 | return crypto_shash_finup(desc, data, nbytes, out) ?: |
| 137 | crypto_shash_import(desc, opad) ?: |
| 138 | crypto_shash_finup(desc, out, ds, out); |
Herbert Xu | 0796ae0 | 2006-08-21 20:50:52 +1000 | [diff] [blame] | 139 | } |
| 140 | |
| 141 | static int hmac_init_tfm(struct crypto_tfm *tfm) |
| 142 | { |
Herbert Xu | 8bd1209 | 2009-07-09 12:43:37 +0800 | [diff] [blame] | 143 | struct crypto_shash *parent = __crypto_shash_cast(tfm); |
| 144 | struct crypto_shash *hash; |
Herbert Xu | 0796ae0 | 2006-08-21 20:50:52 +1000 | [diff] [blame] | 145 | struct crypto_instance *inst = (void *)tfm->__crt_alg; |
Herbert Xu | 8bd1209 | 2009-07-09 12:43:37 +0800 | [diff] [blame] | 146 | struct crypto_shash_spawn *spawn = crypto_instance_ctx(inst); |
| 147 | struct hmac_ctx *ctx = hmac_ctx(parent); |
Herbert Xu | 0796ae0 | 2006-08-21 20:50:52 +1000 | [diff] [blame] | 148 | |
Herbert Xu | 8bd1209 | 2009-07-09 12:43:37 +0800 | [diff] [blame] | 149 | hash = crypto_spawn_shash(spawn); |
Herbert Xu | 2e306ee | 2006-12-17 10:05:58 +1100 | [diff] [blame] | 150 | if (IS_ERR(hash)) |
| 151 | return PTR_ERR(hash); |
Herbert Xu | 0796ae0 | 2006-08-21 20:50:52 +1000 | [diff] [blame] | 152 | |
Herbert Xu | 8bd1209 | 2009-07-09 12:43:37 +0800 | [diff] [blame] | 153 | parent->descsize = sizeof(struct shash_desc) + |
| 154 | crypto_shash_descsize(hash); |
Eric Biggers | 7829a0c | 2019-05-22 12:42:29 -0700 | [diff] [blame] | 155 | if (WARN_ON(parent->descsize > HASH_MAX_DESCSIZE)) { |
| 156 | crypto_free_shash(hash); |
Eric Biggers | e135440 | 2019-05-14 16:13:15 -0700 | [diff] [blame] | 157 | return -EINVAL; |
Eric Biggers | 7829a0c | 2019-05-22 12:42:29 -0700 | [diff] [blame] | 158 | } |
Herbert Xu | 8bd1209 | 2009-07-09 12:43:37 +0800 | [diff] [blame] | 159 | |
Herbert Xu | 0b767b4 | 2009-07-24 15:18:41 +0800 | [diff] [blame] | 160 | ctx->hash = hash; |
Herbert Xu | 0796ae0 | 2006-08-21 20:50:52 +1000 | [diff] [blame] | 161 | return 0; |
| 162 | } |
| 163 | |
| 164 | static void hmac_exit_tfm(struct crypto_tfm *tfm) |
| 165 | { |
Herbert Xu | 8bd1209 | 2009-07-09 12:43:37 +0800 | [diff] [blame] | 166 | struct hmac_ctx *ctx = hmac_ctx(__crypto_shash_cast(tfm)); |
Herbert Xu | 0b767b4 | 2009-07-24 15:18:41 +0800 | [diff] [blame] | 167 | crypto_free_shash(ctx->hash); |
Herbert Xu | 0796ae0 | 2006-08-21 20:50:52 +1000 | [diff] [blame] | 168 | } |
| 169 | |
Herbert Xu | 8bd1209 | 2009-07-09 12:43:37 +0800 | [diff] [blame] | 170 | static int hmac_create(struct crypto_template *tmpl, struct rtattr **tb) |
Herbert Xu | 0796ae0 | 2006-08-21 20:50:52 +1000 | [diff] [blame] | 171 | { |
Herbert Xu | 8bd1209 | 2009-07-09 12:43:37 +0800 | [diff] [blame] | 172 | struct shash_instance *inst; |
Herbert Xu | 0796ae0 | 2006-08-21 20:50:52 +1000 | [diff] [blame] | 173 | struct crypto_alg *alg; |
Herbert Xu | 8bd1209 | 2009-07-09 12:43:37 +0800 | [diff] [blame] | 174 | struct shash_alg *salg; |
Herbert Xu | ebc610e | 2007-01-01 18:37:02 +1100 | [diff] [blame] | 175 | int err; |
Herbert Xu | ca786dc | 2008-07-07 20:23:56 +0800 | [diff] [blame] | 176 | int ds; |
Herbert Xu | 0b767b4 | 2009-07-24 15:18:41 +0800 | [diff] [blame] | 177 | int ss; |
Herbert Xu | 0796ae0 | 2006-08-21 20:50:52 +1000 | [diff] [blame] | 178 | |
Herbert Xu | 8bd1209 | 2009-07-09 12:43:37 +0800 | [diff] [blame] | 179 | err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_SHASH); |
Herbert Xu | ebc610e | 2007-01-01 18:37:02 +1100 | [diff] [blame] | 180 | if (err) |
Herbert Xu | 8bd1209 | 2009-07-09 12:43:37 +0800 | [diff] [blame] | 181 | return err; |
Herbert Xu | ebc610e | 2007-01-01 18:37:02 +1100 | [diff] [blame] | 182 | |
Herbert Xu | 8bd1209 | 2009-07-09 12:43:37 +0800 | [diff] [blame] | 183 | salg = shash_attr_alg(tb[1], 0, 0); |
| 184 | if (IS_ERR(salg)) |
| 185 | return PTR_ERR(salg); |
Eric Biggers | af3ff80 | 2017-11-28 18:01:38 -0800 | [diff] [blame] | 186 | alg = &salg->base; |
Herbert Xu | 0796ae0 | 2006-08-21 20:50:52 +1000 | [diff] [blame] | 187 | |
Eric Biggers | af3ff80 | 2017-11-28 18:01:38 -0800 | [diff] [blame] | 188 | /* The underlying hash algorithm must be unkeyed */ |
Herbert Xu | 8bd1209 | 2009-07-09 12:43:37 +0800 | [diff] [blame] | 189 | err = -EINVAL; |
Eric Biggers | af3ff80 | 2017-11-28 18:01:38 -0800 | [diff] [blame] | 190 | if (crypto_shash_alg_has_setkey(salg)) |
| 191 | goto out_put_alg; |
| 192 | |
Herbert Xu | 8bd1209 | 2009-07-09 12:43:37 +0800 | [diff] [blame] | 193 | ds = salg->digestsize; |
Herbert Xu | 0b767b4 | 2009-07-24 15:18:41 +0800 | [diff] [blame] | 194 | ss = salg->statesize; |
Herbert Xu | 0b767b4 | 2009-07-24 15:18:41 +0800 | [diff] [blame] | 195 | if (ds > alg->cra_blocksize || |
| 196 | ss < alg->cra_blocksize) |
Herbert Xu | ca786dc | 2008-07-07 20:23:56 +0800 | [diff] [blame] | 197 | goto out_put_alg; |
| 198 | |
Herbert Xu | 8bd1209 | 2009-07-09 12:43:37 +0800 | [diff] [blame] | 199 | inst = shash_alloc_instance("hmac", alg); |
Herbert Xu | 3b3fc32 | 2009-07-15 16:52:55 +0800 | [diff] [blame] | 200 | err = PTR_ERR(inst); |
Herbert Xu | 0796ae0 | 2006-08-21 20:50:52 +1000 | [diff] [blame] | 201 | if (IS_ERR(inst)) |
| 202 | goto out_put_alg; |
| 203 | |
Herbert Xu | 8bd1209 | 2009-07-09 12:43:37 +0800 | [diff] [blame] | 204 | err = crypto_init_shash_spawn(shash_instance_ctx(inst), salg, |
| 205 | shash_crypto_instance(inst)); |
| 206 | if (err) |
| 207 | goto out_free_inst; |
Herbert Xu | 0796ae0 | 2006-08-21 20:50:52 +1000 | [diff] [blame] | 208 | |
Herbert Xu | 8bd1209 | 2009-07-09 12:43:37 +0800 | [diff] [blame] | 209 | inst->alg.base.cra_priority = alg->cra_priority; |
| 210 | inst->alg.base.cra_blocksize = alg->cra_blocksize; |
| 211 | inst->alg.base.cra_alignmask = alg->cra_alignmask; |
Herbert Xu | 0796ae0 | 2006-08-21 20:50:52 +1000 | [diff] [blame] | 212 | |
Herbert Xu | 0b767b4 | 2009-07-24 15:18:41 +0800 | [diff] [blame] | 213 | ss = ALIGN(ss, alg->cra_alignmask + 1); |
Herbert Xu | 8bd1209 | 2009-07-09 12:43:37 +0800 | [diff] [blame] | 214 | inst->alg.digestsize = ds; |
Herbert Xu | 0b767b4 | 2009-07-24 15:18:41 +0800 | [diff] [blame] | 215 | inst->alg.statesize = ss; |
Herbert Xu | 0796ae0 | 2006-08-21 20:50:52 +1000 | [diff] [blame] | 216 | |
Herbert Xu | 8bd1209 | 2009-07-09 12:43:37 +0800 | [diff] [blame] | 217 | inst->alg.base.cra_ctxsize = sizeof(struct hmac_ctx) + |
Herbert Xu | 0b767b4 | 2009-07-24 15:18:41 +0800 | [diff] [blame] | 218 | ALIGN(ss * 2, crypto_tfm_ctx_alignment()); |
Herbert Xu | 0796ae0 | 2006-08-21 20:50:52 +1000 | [diff] [blame] | 219 | |
Herbert Xu | 8bd1209 | 2009-07-09 12:43:37 +0800 | [diff] [blame] | 220 | inst->alg.base.cra_init = hmac_init_tfm; |
| 221 | inst->alg.base.cra_exit = hmac_exit_tfm; |
| 222 | |
| 223 | inst->alg.init = hmac_init; |
| 224 | inst->alg.update = hmac_update; |
| 225 | inst->alg.final = hmac_final; |
| 226 | inst->alg.finup = hmac_finup; |
Herbert Xu | 0b767b4 | 2009-07-24 15:18:41 +0800 | [diff] [blame] | 227 | inst->alg.export = hmac_export; |
| 228 | inst->alg.import = hmac_import; |
Herbert Xu | 8bd1209 | 2009-07-09 12:43:37 +0800 | [diff] [blame] | 229 | inst->alg.setkey = hmac_setkey; |
| 230 | |
| 231 | err = shash_register_instance(tmpl, inst); |
| 232 | if (err) { |
| 233 | out_free_inst: |
| 234 | shash_free_instance(shash_crypto_instance(inst)); |
| 235 | } |
Herbert Xu | 0796ae0 | 2006-08-21 20:50:52 +1000 | [diff] [blame] | 236 | |
| 237 | out_put_alg: |
| 238 | crypto_mod_put(alg); |
Herbert Xu | 8bd1209 | 2009-07-09 12:43:37 +0800 | [diff] [blame] | 239 | return err; |
Herbert Xu | 0796ae0 | 2006-08-21 20:50:52 +1000 | [diff] [blame] | 240 | } |
| 241 | |
| 242 | static struct crypto_template hmac_tmpl = { |
| 243 | .name = "hmac", |
Herbert Xu | 8bd1209 | 2009-07-09 12:43:37 +0800 | [diff] [blame] | 244 | .create = hmac_create, |
| 245 | .free = shash_free_instance, |
Herbert Xu | 0796ae0 | 2006-08-21 20:50:52 +1000 | [diff] [blame] | 246 | .module = THIS_MODULE, |
| 247 | }; |
| 248 | |
| 249 | static int __init hmac_module_init(void) |
| 250 | { |
| 251 | return crypto_register_template(&hmac_tmpl); |
| 252 | } |
| 253 | |
| 254 | static void __exit hmac_module_exit(void) |
| 255 | { |
| 256 | crypto_unregister_template(&hmac_tmpl); |
| 257 | } |
| 258 | |
Eric Biggers | c4741b2 | 2019-04-11 21:57:42 -0700 | [diff] [blame] | 259 | subsys_initcall(hmac_module_init); |
Herbert Xu | 0796ae0 | 2006-08-21 20:50:52 +1000 | [diff] [blame] | 260 | module_exit(hmac_module_exit); |
| 261 | |
| 262 | MODULE_LICENSE("GPL"); |
| 263 | MODULE_DESCRIPTION("HMAC hash algorithm"); |
Kees Cook | 4943ba1 | 2014-11-24 16:32:38 -0800 | [diff] [blame] | 264 | MODULE_ALIAS_CRYPTO("hmac"); |