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Linux/crypto/akcipher.c

  1 /*
  2  * Public Key Encryption
  3  *
  4  * Copyright (c) 2015, Intel Corporation
  5  * Authors: Tadeusz Struk <tadeusz.struk@intel.com>
  6  *
  7  * This program is free software; you can redistribute it and/or modify it
  8  * under the terms of the GNU General Public License as published by the Free
  9  * Software Foundation; either version 2 of the License, or (at your option)
 10  * any later version.
 11  *
 12  */
 13 #include <linux/errno.h>
 14 #include <linux/kernel.h>
 15 #include <linux/module.h>
 16 #include <linux/seq_file.h>
 17 #include <linux/slab.h>
 18 #include <linux/string.h>
 19 #include <linux/crypto.h>
 20 #include <crypto/algapi.h>
 21 #include <linux/cryptouser.h>
 22 #include <net/netlink.h>
 23 #include <crypto/akcipher.h>
 24 #include <crypto/internal/akcipher.h>
 25 #include "internal.h"
 26 
 27 #ifdef CONFIG_NET
 28 static int crypto_akcipher_report(struct sk_buff *skb, struct crypto_alg *alg)
 29 {
 30         struct crypto_report_akcipher rakcipher;
 31 
 32         strncpy(rakcipher.type, "akcipher", sizeof(rakcipher.type));
 33 
 34         if (nla_put(skb, CRYPTOCFGA_REPORT_AKCIPHER,
 35                     sizeof(struct crypto_report_akcipher), &rakcipher))
 36                 goto nla_put_failure;
 37         return 0;
 38 
 39 nla_put_failure:
 40         return -EMSGSIZE;
 41 }
 42 #else
 43 static int crypto_akcipher_report(struct sk_buff *skb, struct crypto_alg *alg)
 44 {
 45         return -ENOSYS;
 46 }
 47 #endif
 48 
 49 static void crypto_akcipher_show(struct seq_file *m, struct crypto_alg *alg)
 50         __attribute__ ((unused));
 51 
 52 static void crypto_akcipher_show(struct seq_file *m, struct crypto_alg *alg)
 53 {
 54         seq_puts(m, "type         : akcipher\n");
 55 }
 56 
 57 static void crypto_akcipher_exit_tfm(struct crypto_tfm *tfm)
 58 {
 59         struct crypto_akcipher *akcipher = __crypto_akcipher_tfm(tfm);
 60         struct akcipher_alg *alg = crypto_akcipher_alg(akcipher);
 61 
 62         alg->exit(akcipher);
 63 }
 64 
 65 static int crypto_akcipher_init_tfm(struct crypto_tfm *tfm)
 66 {
 67         struct crypto_akcipher *akcipher = __crypto_akcipher_tfm(tfm);
 68         struct akcipher_alg *alg = crypto_akcipher_alg(akcipher);
 69 
 70         if (alg->exit)
 71                 akcipher->base.exit = crypto_akcipher_exit_tfm;
 72 
 73         if (alg->init)
 74                 return alg->init(akcipher);
 75 
 76         return 0;
 77 }
 78 
 79 static void crypto_akcipher_free_instance(struct crypto_instance *inst)
 80 {
 81         struct akcipher_instance *akcipher = akcipher_instance(inst);
 82 
 83         akcipher->free(akcipher);
 84 }
 85 
 86 static const struct crypto_type crypto_akcipher_type = {
 87         .extsize = crypto_alg_extsize,
 88         .init_tfm = crypto_akcipher_init_tfm,
 89         .free = crypto_akcipher_free_instance,
 90 #ifdef CONFIG_PROC_FS
 91         .show = crypto_akcipher_show,
 92 #endif
 93         .report = crypto_akcipher_report,
 94         .maskclear = ~CRYPTO_ALG_TYPE_MASK,
 95         .maskset = CRYPTO_ALG_TYPE_MASK,
 96         .type = CRYPTO_ALG_TYPE_AKCIPHER,
 97         .tfmsize = offsetof(struct crypto_akcipher, base),
 98 };
 99 
100 int crypto_grab_akcipher(struct crypto_akcipher_spawn *spawn, const char *name,
101                          u32 type, u32 mask)
102 {
103         spawn->base.frontend = &crypto_akcipher_type;
104         return crypto_grab_spawn(&spawn->base, name, type, mask);
105 }
106 EXPORT_SYMBOL_GPL(crypto_grab_akcipher);
107 
108 struct crypto_akcipher *crypto_alloc_akcipher(const char *alg_name, u32 type,
109                                               u32 mask)
110 {
111         return crypto_alloc_tfm(alg_name, &crypto_akcipher_type, type, mask);
112 }
113 EXPORT_SYMBOL_GPL(crypto_alloc_akcipher);
114 
115 static void akcipher_prepare_alg(struct akcipher_alg *alg)
116 {
117         struct crypto_alg *base = &alg->base;
118 
119         base->cra_type = &crypto_akcipher_type;
120         base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
121         base->cra_flags |= CRYPTO_ALG_TYPE_AKCIPHER;
122 }
123 
124 int crypto_register_akcipher(struct akcipher_alg *alg)
125 {
126         struct crypto_alg *base = &alg->base;
127 
128         akcipher_prepare_alg(alg);
129         return crypto_register_alg(base);
130 }
131 EXPORT_SYMBOL_GPL(crypto_register_akcipher);
132 
133 void crypto_unregister_akcipher(struct akcipher_alg *alg)
134 {
135         crypto_unregister_alg(&alg->base);
136 }
137 EXPORT_SYMBOL_GPL(crypto_unregister_akcipher);
138 
139 int akcipher_register_instance(struct crypto_template *tmpl,
140                                struct akcipher_instance *inst)
141 {
142         akcipher_prepare_alg(&inst->alg);
143         return crypto_register_instance(tmpl, akcipher_crypto_instance(inst));
144 }
145 EXPORT_SYMBOL_GPL(akcipher_register_instance);
146 
147 MODULE_LICENSE("GPL");
148 MODULE_DESCRIPTION("Generic public key cipher type");
149 

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