2 * Asynchronous block chaining cipher operations.
4 * This is the asynchronous version of blkcipher.c indicating completion
7 * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the Free
11 * Software Foundation; either version 2 of the License, or (at your option)
16 #include <crypto/internal/skcipher.h>
17 #include <linux/err.h>
18 #include <linux/init.h>
19 #include <linux/kernel.h>
20 #include <linux/module.h>
21 #include <linux/slab.h>
22 #include <linux/seq_file.h>
26 static int setkey_unaligned(struct crypto_ablkcipher *tfm, const u8 *key,
29 struct ablkcipher_alg *cipher = crypto_ablkcipher_alg(tfm);
30 unsigned long alignmask = crypto_ablkcipher_alignmask(tfm);
32 u8 *buffer, *alignbuffer;
35 absize = keylen + alignmask;
36 buffer = kmalloc(absize, GFP_ATOMIC);
40 alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
41 memcpy(alignbuffer, key, keylen);
42 ret = cipher->setkey(tfm, alignbuffer, keylen);
43 memset(alignbuffer, 0, keylen);
48 static int setkey(struct crypto_ablkcipher *tfm, const u8 *key,
51 struct ablkcipher_alg *cipher = crypto_ablkcipher_alg(tfm);
52 unsigned long alignmask = crypto_ablkcipher_alignmask(tfm);
54 if (keylen < cipher->min_keysize || keylen > cipher->max_keysize) {
55 crypto_ablkcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
59 if ((unsigned long)key & alignmask)
60 return setkey_unaligned(tfm, key, keylen);
62 return cipher->setkey(tfm, key, keylen);
65 static unsigned int crypto_ablkcipher_ctxsize(struct crypto_alg *alg, u32 type,
68 return alg->cra_ctxsize;
71 static int crypto_init_ablkcipher_ops(struct crypto_tfm *tfm, u32 type,
74 struct ablkcipher_alg *alg = &tfm->__crt_alg->cra_ablkcipher;
75 struct ablkcipher_tfm *crt = &tfm->crt_ablkcipher;
77 if (alg->ivsize > PAGE_SIZE / 8)
81 crt->encrypt = alg->encrypt;
82 crt->decrypt = alg->decrypt;
83 crt->base = __crypto_ablkcipher_cast(tfm);
84 crt->ivsize = alg->ivsize;
89 static void crypto_ablkcipher_show(struct seq_file *m, struct crypto_alg *alg)
90 __attribute__ ((unused));
91 static void crypto_ablkcipher_show(struct seq_file *m, struct crypto_alg *alg)
93 struct ablkcipher_alg *ablkcipher = &alg->cra_ablkcipher;
95 seq_printf(m, "type : ablkcipher\n");
96 seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
97 seq_printf(m, "min keysize : %u\n", ablkcipher->min_keysize);
98 seq_printf(m, "max keysize : %u\n", ablkcipher->max_keysize);
99 seq_printf(m, "ivsize : %u\n", ablkcipher->ivsize);
100 seq_printf(m, "geniv : %s\n", ablkcipher->geniv ?: "<default>");
103 const struct crypto_type crypto_ablkcipher_type = {
104 .ctxsize = crypto_ablkcipher_ctxsize,
105 .init = crypto_init_ablkcipher_ops,
106 #ifdef CONFIG_PROC_FS
107 .show = crypto_ablkcipher_show,
110 EXPORT_SYMBOL_GPL(crypto_ablkcipher_type);
112 static int no_givdecrypt(struct skcipher_givcrypt_request *req)
117 static int crypto_init_givcipher_ops(struct crypto_tfm *tfm, u32 type,
120 struct ablkcipher_alg *alg = &tfm->__crt_alg->cra_ablkcipher;
121 struct ablkcipher_tfm *crt = &tfm->crt_ablkcipher;
123 if (alg->ivsize > PAGE_SIZE / 8)
126 crt->setkey = tfm->__crt_alg->cra_flags & CRYPTO_ALG_GENIV ?
127 alg->setkey : setkey;
128 crt->encrypt = alg->encrypt;
129 crt->decrypt = alg->decrypt;
130 crt->givencrypt = alg->givencrypt;
131 crt->givdecrypt = alg->givdecrypt ?: no_givdecrypt;
132 crt->base = __crypto_ablkcipher_cast(tfm);
133 crt->ivsize = alg->ivsize;
138 static void crypto_givcipher_show(struct seq_file *m, struct crypto_alg *alg)
139 __attribute__ ((unused));
140 static void crypto_givcipher_show(struct seq_file *m, struct crypto_alg *alg)
142 struct ablkcipher_alg *ablkcipher = &alg->cra_ablkcipher;
144 seq_printf(m, "type : givcipher\n");
145 seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
146 seq_printf(m, "min keysize : %u\n", ablkcipher->min_keysize);
147 seq_printf(m, "max keysize : %u\n", ablkcipher->max_keysize);
148 seq_printf(m, "ivsize : %u\n", ablkcipher->ivsize);
149 seq_printf(m, "geniv : %s\n", ablkcipher->geniv ?: "<built-in>");
152 const struct crypto_type crypto_givcipher_type = {
153 .ctxsize = crypto_ablkcipher_ctxsize,
154 .init = crypto_init_givcipher_ops,
155 #ifdef CONFIG_PROC_FS
156 .show = crypto_givcipher_show,
159 EXPORT_SYMBOL_GPL(crypto_givcipher_type);
161 const char *crypto_default_geniv(const struct crypto_alg *alg)
163 return alg->cra_flags & CRYPTO_ALG_ASYNC ? "eseqiv" : "chainiv";
166 int crypto_grab_skcipher(struct crypto_skcipher_spawn *spawn, const char *name,
169 struct crypto_alg *alg;
172 type = crypto_skcipher_type(type);
173 mask = crypto_skcipher_mask(mask);
175 alg = crypto_alg_mod_lookup(name, type, mask);
179 err = crypto_init_spawn(&spawn->base, alg, spawn->base.inst, mask);
183 EXPORT_SYMBOL_GPL(crypto_grab_skcipher);
185 MODULE_LICENSE("GPL");
186 MODULE_DESCRIPTION("Asynchronous block chaining cipher type");