Version:  2.0.40 2.2.26 2.4.37 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 4.10

Linux/crypto/ecb.c

  1 /*
  2  * ECB: Electronic CodeBook mode
  3  *
  4  * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
  5  *
  6  * This program is free software; you can redistribute it and/or modify it
  7  * under the terms of the GNU General Public License as published by the Free
  8  * Software Foundation; either version 2 of the License, or (at your option)
  9  * any later version.
 10  *
 11  */
 12 
 13 #include <crypto/algapi.h>
 14 #include <linux/err.h>
 15 #include <linux/init.h>
 16 #include <linux/kernel.h>
 17 #include <linux/module.h>
 18 #include <linux/scatterlist.h>
 19 #include <linux/slab.h>
 20 
 21 struct crypto_ecb_ctx {
 22         struct crypto_cipher *child;
 23 };
 24 
 25 static int crypto_ecb_setkey(struct crypto_tfm *parent, const u8 *key,
 26                              unsigned int keylen)
 27 {
 28         struct crypto_ecb_ctx *ctx = crypto_tfm_ctx(parent);
 29         struct crypto_cipher *child = ctx->child;
 30         int err;
 31 
 32         crypto_cipher_clear_flags(child, CRYPTO_TFM_REQ_MASK);
 33         crypto_cipher_set_flags(child, crypto_tfm_get_flags(parent) &
 34                                        CRYPTO_TFM_REQ_MASK);
 35         err = crypto_cipher_setkey(child, key, keylen);
 36         crypto_tfm_set_flags(parent, crypto_cipher_get_flags(child) &
 37                                      CRYPTO_TFM_RES_MASK);
 38         return err;
 39 }
 40 
 41 static int crypto_ecb_crypt(struct blkcipher_desc *desc,
 42                             struct blkcipher_walk *walk,
 43                             struct crypto_cipher *tfm,
 44                             void (*fn)(struct crypto_tfm *, u8 *, const u8 *))
 45 {
 46         int bsize = crypto_cipher_blocksize(tfm);
 47         unsigned int nbytes;
 48         int err;
 49 
 50         err = blkcipher_walk_virt(desc, walk);
 51 
 52         while ((nbytes = walk->nbytes)) {
 53                 u8 *wsrc = walk->src.virt.addr;
 54                 u8 *wdst = walk->dst.virt.addr;
 55 
 56                 do {
 57                         fn(crypto_cipher_tfm(tfm), wdst, wsrc);
 58 
 59                         wsrc += bsize;
 60                         wdst += bsize;
 61                 } while ((nbytes -= bsize) >= bsize);
 62 
 63                 err = blkcipher_walk_done(desc, walk, nbytes);
 64         }
 65 
 66         return err;
 67 }
 68 
 69 static int crypto_ecb_encrypt(struct blkcipher_desc *desc,
 70                               struct scatterlist *dst, struct scatterlist *src,
 71                               unsigned int nbytes)
 72 {
 73         struct blkcipher_walk walk;
 74         struct crypto_blkcipher *tfm = desc->tfm;
 75         struct crypto_ecb_ctx *ctx = crypto_blkcipher_ctx(tfm);
 76         struct crypto_cipher *child = ctx->child;
 77 
 78         blkcipher_walk_init(&walk, dst, src, nbytes);
 79         return crypto_ecb_crypt(desc, &walk, child,
 80                                 crypto_cipher_alg(child)->cia_encrypt);
 81 }
 82 
 83 static int crypto_ecb_decrypt(struct blkcipher_desc *desc,
 84                               struct scatterlist *dst, struct scatterlist *src,
 85                               unsigned int nbytes)
 86 {
 87         struct blkcipher_walk walk;
 88         struct crypto_blkcipher *tfm = desc->tfm;
 89         struct crypto_ecb_ctx *ctx = crypto_blkcipher_ctx(tfm);
 90         struct crypto_cipher *child = ctx->child;
 91 
 92         blkcipher_walk_init(&walk, dst, src, nbytes);
 93         return crypto_ecb_crypt(desc, &walk, child,
 94                                 crypto_cipher_alg(child)->cia_decrypt);
 95 }
 96 
 97 static int crypto_ecb_init_tfm(struct crypto_tfm *tfm)
 98 {
 99         struct crypto_instance *inst = (void *)tfm->__crt_alg;
100         struct crypto_spawn *spawn = crypto_instance_ctx(inst);
101         struct crypto_ecb_ctx *ctx = crypto_tfm_ctx(tfm);
102         struct crypto_cipher *cipher;
103 
104         cipher = crypto_spawn_cipher(spawn);
105         if (IS_ERR(cipher))
106                 return PTR_ERR(cipher);
107 
108         ctx->child = cipher;
109         return 0;
110 }
111 
112 static void crypto_ecb_exit_tfm(struct crypto_tfm *tfm)
113 {
114         struct crypto_ecb_ctx *ctx = crypto_tfm_ctx(tfm);
115         crypto_free_cipher(ctx->child);
116 }
117 
118 static struct crypto_instance *crypto_ecb_alloc(struct rtattr **tb)
119 {
120         struct crypto_instance *inst;
121         struct crypto_alg *alg;
122         int err;
123 
124         err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_BLKCIPHER);
125         if (err)
126                 return ERR_PTR(err);
127 
128         alg = crypto_get_attr_alg(tb, CRYPTO_ALG_TYPE_CIPHER,
129                                   CRYPTO_ALG_TYPE_MASK);
130         if (IS_ERR(alg))
131                 return ERR_CAST(alg);
132 
133         inst = crypto_alloc_instance("ecb", alg);
134         if (IS_ERR(inst))
135                 goto out_put_alg;
136 
137         inst->alg.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER;
138         inst->alg.cra_priority = alg->cra_priority;
139         inst->alg.cra_blocksize = alg->cra_blocksize;
140         inst->alg.cra_alignmask = alg->cra_alignmask;
141         inst->alg.cra_type = &crypto_blkcipher_type;
142 
143         inst->alg.cra_blkcipher.min_keysize = alg->cra_cipher.cia_min_keysize;
144         inst->alg.cra_blkcipher.max_keysize = alg->cra_cipher.cia_max_keysize;
145 
146         inst->alg.cra_ctxsize = sizeof(struct crypto_ecb_ctx);
147 
148         inst->alg.cra_init = crypto_ecb_init_tfm;
149         inst->alg.cra_exit = crypto_ecb_exit_tfm;
150 
151         inst->alg.cra_blkcipher.setkey = crypto_ecb_setkey;
152         inst->alg.cra_blkcipher.encrypt = crypto_ecb_encrypt;
153         inst->alg.cra_blkcipher.decrypt = crypto_ecb_decrypt;
154 
155 out_put_alg:
156         crypto_mod_put(alg);
157         return inst;
158 }
159 
160 static void crypto_ecb_free(struct crypto_instance *inst)
161 {
162         crypto_drop_spawn(crypto_instance_ctx(inst));
163         kfree(inst);
164 }
165 
166 static struct crypto_template crypto_ecb_tmpl = {
167         .name = "ecb",
168         .alloc = crypto_ecb_alloc,
169         .free = crypto_ecb_free,
170         .module = THIS_MODULE,
171 };
172 
173 static int __init crypto_ecb_module_init(void)
174 {
175         return crypto_register_template(&crypto_ecb_tmpl);
176 }
177 
178 static void __exit crypto_ecb_module_exit(void)
179 {
180         crypto_unregister_template(&crypto_ecb_tmpl);
181 }
182 
183 module_init(crypto_ecb_module_init);
184 module_exit(crypto_ecb_module_exit);
185 
186 MODULE_LICENSE("GPL");
187 MODULE_DESCRIPTION("ECB block cipher algorithm");
188 MODULE_ALIAS_CRYPTO("ecb");
189 

This page was automatically generated by LXR 0.3.1 (source).  •  Linux is a registered trademark of Linus Torvalds  •  Contact us