Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Cryptographic API. |
| 3 | * |
| 4 | * HMAC: Keyed-Hashing for Message Authentication (RFC2104). |
| 5 | * |
| 6 | * Copyright (c) 2002 James Morris <jmorris@intercode.com.au> |
Herbert Xu | 0796ae0 | 2006-08-21 20:50:52 +1000 | [diff] [blame] | 7 | * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 8 | * |
| 9 | * The HMAC implementation is derived from USAGI. |
| 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 |
Herbert Xu | 0796ae0 | 2006-08-21 20:50:52 +1000 | [diff] [blame] | 14 | * Software Foundation; either version 2 of the License, or (at your option) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | * any later version. |
| 16 | * |
| 17 | */ |
Herbert Xu | 0796ae0 | 2006-08-21 20:50:52 +1000 | [diff] [blame] | 18 | |
Herbert Xu | 5f7082e | 2008-08-31 22:21:09 +1000 | [diff] [blame] | 19 | #include <crypto/internal/hash.h> |
Herbert Xu | b2ab4a5 | 2007-12-05 20:59:25 +1100 | [diff] [blame] | 20 | #include <crypto/scatterwalk.h> |
Herbert Xu | 0796ae0 | 2006-08-21 20:50:52 +1000 | [diff] [blame] | 21 | #include <linux/err.h> |
| 22 | #include <linux/init.h> |
| 23 | #include <linux/kernel.h> |
| 24 | #include <linux/module.h> |
David Hardeman | 378f058 | 2005-09-17 17:55:31 +1000 | [diff] [blame] | 25 | #include <linux/scatterlist.h> |
Herbert Xu | 0796ae0 | 2006-08-21 20:50:52 +1000 | [diff] [blame] | 26 | #include <linux/slab.h> |
| 27 | #include <linux/string.h> |
| 28 | |
| 29 | struct hmac_ctx { |
Herbert Xu | 0b767b4 | 2009-07-24 15:18:41 +0800 | [diff] [blame^] | 30 | struct crypto_shash *hash; |
Herbert Xu | 0796ae0 | 2006-08-21 20:50:52 +1000 | [diff] [blame] | 31 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | |
Herbert Xu | 0796ae0 | 2006-08-21 20:50:52 +1000 | [diff] [blame] | 33 | static inline void *align_ptr(void *p, unsigned int align) |
| 34 | { |
| 35 | return (void *)ALIGN((unsigned long)p, align); |
| 36 | } |
| 37 | |
Herbert Xu | 8bd1209 | 2009-07-09 12:43:37 +0800 | [diff] [blame] | 38 | static inline struct hmac_ctx *hmac_ctx(struct crypto_shash *tfm) |
Herbert Xu | 0796ae0 | 2006-08-21 20:50:52 +1000 | [diff] [blame] | 39 | { |
Herbert Xu | 8bd1209 | 2009-07-09 12:43:37 +0800 | [diff] [blame] | 40 | return align_ptr(crypto_shash_ctx_aligned(tfm) + |
Herbert Xu | 0b767b4 | 2009-07-24 15:18:41 +0800 | [diff] [blame^] | 41 | crypto_shash_statesize(tfm) * 2, |
Herbert Xu | 8bd1209 | 2009-07-09 12:43:37 +0800 | [diff] [blame] | 42 | crypto_tfm_ctx_alignment()); |
Herbert Xu | 0796ae0 | 2006-08-21 20:50:52 +1000 | [diff] [blame] | 43 | } |
| 44 | |
Herbert Xu | 8bd1209 | 2009-07-09 12:43:37 +0800 | [diff] [blame] | 45 | static int hmac_setkey(struct crypto_shash *parent, |
Herbert Xu | 0796ae0 | 2006-08-21 20:50:52 +1000 | [diff] [blame] | 46 | const u8 *inkey, unsigned int keylen) |
| 47 | { |
Herbert Xu | 8bd1209 | 2009-07-09 12:43:37 +0800 | [diff] [blame] | 48 | int bs = crypto_shash_blocksize(parent); |
| 49 | int ds = crypto_shash_digestsize(parent); |
Herbert Xu | 0b767b4 | 2009-07-24 15:18:41 +0800 | [diff] [blame^] | 50 | int ss = crypto_shash_statesize(parent); |
Herbert Xu | 8bd1209 | 2009-07-09 12:43:37 +0800 | [diff] [blame] | 51 | char *ipad = crypto_shash_ctx_aligned(parent); |
Herbert Xu | 0b767b4 | 2009-07-24 15:18:41 +0800 | [diff] [blame^] | 52 | char *opad = ipad + ss; |
| 53 | struct hmac_ctx *ctx = align_ptr(opad + ss, |
Herbert Xu | 8bd1209 | 2009-07-09 12:43:37 +0800 | [diff] [blame] | 54 | crypto_tfm_ctx_alignment()); |
Herbert Xu | 0b767b4 | 2009-07-24 15:18:41 +0800 | [diff] [blame^] | 55 | struct crypto_shash *hash = ctx->hash; |
| 56 | struct { |
| 57 | struct shash_desc shash; |
| 58 | char ctx[crypto_shash_descsize(hash)]; |
| 59 | } desc; |
Herbert Xu | 0796ae0 | 2006-08-21 20:50:52 +1000 | [diff] [blame] | 60 | unsigned int i; |
| 61 | |
Herbert Xu | 0b767b4 | 2009-07-24 15:18:41 +0800 | [diff] [blame^] | 62 | desc.shash.tfm = hash; |
| 63 | desc.shash.flags = crypto_shash_get_flags(parent) & |
| 64 | CRYPTO_TFM_REQ_MAY_SLEEP; |
| 65 | |
Herbert Xu | 0796ae0 | 2006-08-21 20:50:52 +1000 | [diff] [blame] | 66 | if (keylen > bs) { |
Herbert Xu | 0796ae0 | 2006-08-21 20:50:52 +1000 | [diff] [blame] | 67 | int err; |
| 68 | |
Herbert Xu | 0b767b4 | 2009-07-24 15:18:41 +0800 | [diff] [blame^] | 69 | err = crypto_shash_digest(&desc.shash, inkey, keylen, ipad); |
Herbert Xu | 0796ae0 | 2006-08-21 20:50:52 +1000 | [diff] [blame] | 70 | if (err) |
| 71 | return err; |
| 72 | |
Herbert Xu | 0796ae0 | 2006-08-21 20:50:52 +1000 | [diff] [blame] | 73 | keylen = ds; |
Herbert Xu | 0b767b4 | 2009-07-24 15:18:41 +0800 | [diff] [blame^] | 74 | } else |
| 75 | memcpy(ipad, inkey, keylen); |
Herbert Xu | 0796ae0 | 2006-08-21 20:50:52 +1000 | [diff] [blame] | 76 | |
Herbert Xu | 0796ae0 | 2006-08-21 20:50:52 +1000 | [diff] [blame] | 77 | memset(ipad + keylen, 0, bs - keylen); |
| 78 | memcpy(opad, ipad, bs); |
| 79 | |
| 80 | for (i = 0; i < bs; i++) { |
| 81 | ipad[i] ^= 0x36; |
| 82 | opad[i] ^= 0x5c; |
| 83 | } |
| 84 | |
Herbert Xu | 0b767b4 | 2009-07-24 15:18:41 +0800 | [diff] [blame^] | 85 | return crypto_shash_init(&desc.shash) ?: |
| 86 | crypto_shash_update(&desc.shash, ipad, bs) ?: |
| 87 | crypto_shash_export(&desc.shash, ipad) ?: |
| 88 | crypto_shash_init(&desc.shash) ?: |
| 89 | crypto_shash_update(&desc.shash, opad, bs) ?: |
| 90 | crypto_shash_export(&desc.shash, opad); |
| 91 | } |
| 92 | |
| 93 | static int hmac_export(struct shash_desc *pdesc, void *out) |
| 94 | { |
| 95 | struct shash_desc *desc = shash_desc_ctx(pdesc); |
| 96 | |
| 97 | desc->flags = pdesc->flags & CRYPTO_TFM_REQ_MAY_SLEEP; |
| 98 | |
| 99 | return crypto_shash_export(desc, out); |
| 100 | } |
| 101 | |
| 102 | static int hmac_import(struct shash_desc *pdesc, const void *in) |
| 103 | { |
| 104 | struct shash_desc *desc = shash_desc_ctx(pdesc); |
| 105 | struct hmac_ctx *ctx = hmac_ctx(pdesc->tfm); |
| 106 | |
| 107 | desc->tfm = ctx->hash; |
| 108 | desc->flags = pdesc->flags & CRYPTO_TFM_REQ_MAY_SLEEP; |
| 109 | |
| 110 | return crypto_shash_import(desc, in); |
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_init(struct shash_desc *pdesc) |
Herbert Xu | 0796ae0 | 2006-08-21 20:50:52 +1000 | [diff] [blame] | 114 | { |
Herbert Xu | 0b767b4 | 2009-07-24 15:18:41 +0800 | [diff] [blame^] | 115 | return hmac_import(pdesc, crypto_shash_ctx_aligned(pdesc->tfm)); |
Herbert Xu | 0796ae0 | 2006-08-21 20:50:52 +1000 | [diff] [blame] | 116 | } |
| 117 | |
Herbert Xu | 8bd1209 | 2009-07-09 12:43:37 +0800 | [diff] [blame] | 118 | static int hmac_update(struct shash_desc *pdesc, |
| 119 | const u8 *data, unsigned int nbytes) |
Herbert Xu | 0796ae0 | 2006-08-21 20:50:52 +1000 | [diff] [blame] | 120 | { |
Herbert Xu | 8bd1209 | 2009-07-09 12:43:37 +0800 | [diff] [blame] | 121 | struct shash_desc *desc = shash_desc_ctx(pdesc); |
Herbert Xu | 0796ae0 | 2006-08-21 20:50:52 +1000 | [diff] [blame] | 122 | |
Herbert Xu | 8bd1209 | 2009-07-09 12:43:37 +0800 | [diff] [blame] | 123 | desc->flags = pdesc->flags & CRYPTO_TFM_REQ_MAY_SLEEP; |
Herbert Xu | 0796ae0 | 2006-08-21 20:50:52 +1000 | [diff] [blame] | 124 | |
Herbert Xu | 8bd1209 | 2009-07-09 12:43:37 +0800 | [diff] [blame] | 125 | return crypto_shash_update(desc, data, nbytes); |
Herbert Xu | 0796ae0 | 2006-08-21 20:50:52 +1000 | [diff] [blame] | 126 | } |
| 127 | |
Herbert Xu | 8bd1209 | 2009-07-09 12:43:37 +0800 | [diff] [blame] | 128 | static int hmac_final(struct shash_desc *pdesc, u8 *out) |
Herbert Xu | 0796ae0 | 2006-08-21 20:50:52 +1000 | [diff] [blame] | 129 | { |
Herbert Xu | 8bd1209 | 2009-07-09 12:43:37 +0800 | [diff] [blame] | 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 | 8bd1209 | 2009-07-09 12:43:37 +0800 | [diff] [blame] | 136 | desc->flags = pdesc->flags & CRYPTO_TFM_REQ_MAY_SLEEP; |
Herbert Xu | 0796ae0 | 2006-08-21 20:50:52 +1000 | [diff] [blame] | 137 | |
Herbert Xu | 0b767b4 | 2009-07-24 15:18:41 +0800 | [diff] [blame^] | 138 | return crypto_shash_final(desc, out) ?: |
| 139 | crypto_shash_import(desc, opad) ?: |
| 140 | crypto_shash_finup(desc, out, ds, out); |
Herbert Xu | 0796ae0 | 2006-08-21 20:50:52 +1000 | [diff] [blame] | 141 | } |
| 142 | |
Herbert Xu | 8bd1209 | 2009-07-09 12:43:37 +0800 | [diff] [blame] | 143 | static int hmac_finup(struct shash_desc *pdesc, const u8 *data, |
| 144 | unsigned int nbytes, u8 *out) |
Herbert Xu | 0796ae0 | 2006-08-21 20:50:52 +1000 | [diff] [blame] | 145 | { |
Herbert Xu | 8bd1209 | 2009-07-09 12:43:37 +0800 | [diff] [blame] | 146 | |
| 147 | struct crypto_shash *parent = pdesc->tfm; |
Herbert Xu | 8bd1209 | 2009-07-09 12:43:37 +0800 | [diff] [blame] | 148 | int ds = crypto_shash_digestsize(parent); |
Herbert Xu | 0b767b4 | 2009-07-24 15:18:41 +0800 | [diff] [blame^] | 149 | int ss = crypto_shash_statesize(parent); |
| 150 | char *opad = crypto_shash_ctx_aligned(parent) + ss; |
Herbert Xu | 8bd1209 | 2009-07-09 12:43:37 +0800 | [diff] [blame] | 151 | struct shash_desc *desc = shash_desc_ctx(pdesc); |
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 | desc->flags = pdesc->flags & CRYPTO_TFM_REQ_MAY_SLEEP; |
Herbert Xu | 0796ae0 | 2006-08-21 20:50:52 +1000 | [diff] [blame] | 154 | |
Herbert Xu | 0b767b4 | 2009-07-24 15:18:41 +0800 | [diff] [blame^] | 155 | return crypto_shash_finup(desc, data, nbytes, out) ?: |
| 156 | crypto_shash_import(desc, opad) ?: |
| 157 | crypto_shash_finup(desc, out, ds, out); |
Herbert Xu | 0796ae0 | 2006-08-21 20:50:52 +1000 | [diff] [blame] | 158 | } |
| 159 | |
| 160 | static int hmac_init_tfm(struct crypto_tfm *tfm) |
| 161 | { |
Herbert Xu | 8bd1209 | 2009-07-09 12:43:37 +0800 | [diff] [blame] | 162 | struct crypto_shash *parent = __crypto_shash_cast(tfm); |
| 163 | struct crypto_shash *hash; |
Herbert Xu | 0796ae0 | 2006-08-21 20:50:52 +1000 | [diff] [blame] | 164 | struct crypto_instance *inst = (void *)tfm->__crt_alg; |
Herbert Xu | 8bd1209 | 2009-07-09 12:43:37 +0800 | [diff] [blame] | 165 | struct crypto_shash_spawn *spawn = crypto_instance_ctx(inst); |
| 166 | struct hmac_ctx *ctx = hmac_ctx(parent); |
Herbert Xu | 0796ae0 | 2006-08-21 20:50:52 +1000 | [diff] [blame] | 167 | |
Herbert Xu | 8bd1209 | 2009-07-09 12:43:37 +0800 | [diff] [blame] | 168 | hash = crypto_spawn_shash(spawn); |
Herbert Xu | 2e306ee | 2006-12-17 10:05:58 +1100 | [diff] [blame] | 169 | if (IS_ERR(hash)) |
| 170 | return PTR_ERR(hash); |
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 | parent->descsize = sizeof(struct shash_desc) + |
| 173 | crypto_shash_descsize(hash); |
| 174 | |
Herbert Xu | 0b767b4 | 2009-07-24 15:18:41 +0800 | [diff] [blame^] | 175 | ctx->hash = hash; |
Herbert Xu | 0796ae0 | 2006-08-21 20:50:52 +1000 | [diff] [blame] | 176 | return 0; |
| 177 | } |
| 178 | |
| 179 | static void hmac_exit_tfm(struct crypto_tfm *tfm) |
| 180 | { |
Herbert Xu | 8bd1209 | 2009-07-09 12:43:37 +0800 | [diff] [blame] | 181 | struct hmac_ctx *ctx = hmac_ctx(__crypto_shash_cast(tfm)); |
Herbert Xu | 0b767b4 | 2009-07-24 15:18:41 +0800 | [diff] [blame^] | 182 | crypto_free_shash(ctx->hash); |
Herbert Xu | 0796ae0 | 2006-08-21 20:50:52 +1000 | [diff] [blame] | 183 | } |
| 184 | |
Herbert Xu | 8bd1209 | 2009-07-09 12:43:37 +0800 | [diff] [blame] | 185 | static int hmac_create(struct crypto_template *tmpl, struct rtattr **tb) |
Herbert Xu | 0796ae0 | 2006-08-21 20:50:52 +1000 | [diff] [blame] | 186 | { |
Herbert Xu | 8bd1209 | 2009-07-09 12:43:37 +0800 | [diff] [blame] | 187 | struct shash_instance *inst; |
Herbert Xu | 0796ae0 | 2006-08-21 20:50:52 +1000 | [diff] [blame] | 188 | struct crypto_alg *alg; |
Herbert Xu | 8bd1209 | 2009-07-09 12:43:37 +0800 | [diff] [blame] | 189 | struct shash_alg *salg; |
Herbert Xu | ebc610e | 2007-01-01 18:37:02 +1100 | [diff] [blame] | 190 | int err; |
Herbert Xu | ca786dc | 2008-07-07 20:23:56 +0800 | [diff] [blame] | 191 | int ds; |
Herbert Xu | 0b767b4 | 2009-07-24 15:18:41 +0800 | [diff] [blame^] | 192 | int ss; |
Herbert Xu | 0796ae0 | 2006-08-21 20:50:52 +1000 | [diff] [blame] | 193 | |
Herbert Xu | 8bd1209 | 2009-07-09 12:43:37 +0800 | [diff] [blame] | 194 | err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_SHASH); |
Herbert Xu | ebc610e | 2007-01-01 18:37:02 +1100 | [diff] [blame] | 195 | if (err) |
Herbert Xu | 8bd1209 | 2009-07-09 12:43:37 +0800 | [diff] [blame] | 196 | return err; |
Herbert Xu | ebc610e | 2007-01-01 18:37:02 +1100 | [diff] [blame] | 197 | |
Herbert Xu | 8bd1209 | 2009-07-09 12:43:37 +0800 | [diff] [blame] | 198 | salg = shash_attr_alg(tb[1], 0, 0); |
| 199 | if (IS_ERR(salg)) |
| 200 | return PTR_ERR(salg); |
Herbert Xu | 0796ae0 | 2006-08-21 20:50:52 +1000 | [diff] [blame] | 201 | |
Herbert Xu | 8bd1209 | 2009-07-09 12:43:37 +0800 | [diff] [blame] | 202 | err = -EINVAL; |
| 203 | ds = salg->digestsize; |
Herbert Xu | 0b767b4 | 2009-07-24 15:18:41 +0800 | [diff] [blame^] | 204 | ss = salg->statesize; |
Herbert Xu | 8bd1209 | 2009-07-09 12:43:37 +0800 | [diff] [blame] | 205 | alg = &salg->base; |
Herbert Xu | 0b767b4 | 2009-07-24 15:18:41 +0800 | [diff] [blame^] | 206 | if (ds > alg->cra_blocksize || |
| 207 | ss < alg->cra_blocksize) |
Herbert Xu | ca786dc | 2008-07-07 20:23:56 +0800 | [diff] [blame] | 208 | goto out_put_alg; |
| 209 | |
Herbert Xu | 8bd1209 | 2009-07-09 12:43:37 +0800 | [diff] [blame] | 210 | inst = shash_alloc_instance("hmac", alg); |
Herbert Xu | 3b3fc32 | 2009-07-15 16:52:55 +0800 | [diff] [blame] | 211 | err = PTR_ERR(inst); |
Herbert Xu | 0796ae0 | 2006-08-21 20:50:52 +1000 | [diff] [blame] | 212 | if (IS_ERR(inst)) |
| 213 | goto out_put_alg; |
| 214 | |
Herbert Xu | 8bd1209 | 2009-07-09 12:43:37 +0800 | [diff] [blame] | 215 | err = crypto_init_shash_spawn(shash_instance_ctx(inst), salg, |
| 216 | shash_crypto_instance(inst)); |
| 217 | if (err) |
| 218 | goto out_free_inst; |
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_priority = alg->cra_priority; |
| 221 | inst->alg.base.cra_blocksize = alg->cra_blocksize; |
| 222 | inst->alg.base.cra_alignmask = alg->cra_alignmask; |
Herbert Xu | 0796ae0 | 2006-08-21 20:50:52 +1000 | [diff] [blame] | 223 | |
Herbert Xu | 0b767b4 | 2009-07-24 15:18:41 +0800 | [diff] [blame^] | 224 | ss = ALIGN(ss, alg->cra_alignmask + 1); |
Herbert Xu | 8bd1209 | 2009-07-09 12:43:37 +0800 | [diff] [blame] | 225 | inst->alg.digestsize = ds; |
Herbert Xu | 0b767b4 | 2009-07-24 15:18:41 +0800 | [diff] [blame^] | 226 | inst->alg.statesize = ss; |
Herbert Xu | 0796ae0 | 2006-08-21 20:50:52 +1000 | [diff] [blame] | 227 | |
Herbert Xu | 8bd1209 | 2009-07-09 12:43:37 +0800 | [diff] [blame] | 228 | inst->alg.base.cra_ctxsize = sizeof(struct hmac_ctx) + |
Herbert Xu | 0b767b4 | 2009-07-24 15:18:41 +0800 | [diff] [blame^] | 229 | ALIGN(ss * 2, crypto_tfm_ctx_alignment()); |
Herbert Xu | 0796ae0 | 2006-08-21 20:50:52 +1000 | [diff] [blame] | 230 | |
Herbert Xu | 8bd1209 | 2009-07-09 12:43:37 +0800 | [diff] [blame] | 231 | inst->alg.base.cra_init = hmac_init_tfm; |
| 232 | inst->alg.base.cra_exit = hmac_exit_tfm; |
| 233 | |
| 234 | inst->alg.init = hmac_init; |
| 235 | inst->alg.update = hmac_update; |
| 236 | inst->alg.final = hmac_final; |
| 237 | inst->alg.finup = hmac_finup; |
Herbert Xu | 0b767b4 | 2009-07-24 15:18:41 +0800 | [diff] [blame^] | 238 | inst->alg.export = hmac_export; |
| 239 | inst->alg.import = hmac_import; |
Herbert Xu | 8bd1209 | 2009-07-09 12:43:37 +0800 | [diff] [blame] | 240 | inst->alg.setkey = hmac_setkey; |
| 241 | |
| 242 | err = shash_register_instance(tmpl, inst); |
| 243 | if (err) { |
| 244 | out_free_inst: |
| 245 | shash_free_instance(shash_crypto_instance(inst)); |
| 246 | } |
Herbert Xu | 0796ae0 | 2006-08-21 20:50:52 +1000 | [diff] [blame] | 247 | |
| 248 | out_put_alg: |
| 249 | crypto_mod_put(alg); |
Herbert Xu | 8bd1209 | 2009-07-09 12:43:37 +0800 | [diff] [blame] | 250 | return err; |
Herbert Xu | 0796ae0 | 2006-08-21 20:50:52 +1000 | [diff] [blame] | 251 | } |
| 252 | |
| 253 | static struct crypto_template hmac_tmpl = { |
| 254 | .name = "hmac", |
Herbert Xu | 8bd1209 | 2009-07-09 12:43:37 +0800 | [diff] [blame] | 255 | .create = hmac_create, |
| 256 | .free = shash_free_instance, |
Herbert Xu | 0796ae0 | 2006-08-21 20:50:52 +1000 | [diff] [blame] | 257 | .module = THIS_MODULE, |
| 258 | }; |
| 259 | |
| 260 | static int __init hmac_module_init(void) |
| 261 | { |
| 262 | return crypto_register_template(&hmac_tmpl); |
| 263 | } |
| 264 | |
| 265 | static void __exit hmac_module_exit(void) |
| 266 | { |
| 267 | crypto_unregister_template(&hmac_tmpl); |
| 268 | } |
| 269 | |
| 270 | module_init(hmac_module_init); |
| 271 | module_exit(hmac_module_exit); |
| 272 | |
| 273 | MODULE_LICENSE("GPL"); |
| 274 | MODULE_DESCRIPTION("HMAC hash algorithm"); |