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 <linux/compiler.h> 21 #include <crypto/algapi.h> 22 #include <linux/cryptouser.h> 23 #include <net/netlink.h> 24 #include <crypto/akcipher.h> 25 #include <crypto/internal/akcipher.h> 26 #include "internal.h" 27 28 #ifdef CONFIG_NET 29 static int crypto_akcipher_report(struct sk_buff *skb, struct crypto_alg *alg) 30 { 31 struct crypto_report_akcipher rakcipher; 32 33 strncpy(rakcipher.type, "akcipher", sizeof(rakcipher.type)); 34 35 if (nla_put(skb, CRYPTOCFGA_REPORT_AKCIPHER, 36 sizeof(struct crypto_report_akcipher), &rakcipher)) 37 goto nla_put_failure; 38 return 0; 39 40 nla_put_failure: 41 return -EMSGSIZE; 42 } 43 #else 44 static int crypto_akcipher_report(struct sk_buff *skb, struct crypto_alg *alg) 45 { 46 return -ENOSYS; 47 } 48 #endif 49 50 static void crypto_akcipher_show(struct seq_file *m, struct crypto_alg *alg) 51 __maybe_unused; 52 53 static void crypto_akcipher_show(struct seq_file *m, struct crypto_alg *alg) 54 { 55 seq_puts(m, "type : akcipher\n"); 56 } 57 58 static void crypto_akcipher_exit_tfm(struct crypto_tfm *tfm) 59 { 60 struct crypto_akcipher *akcipher = __crypto_akcipher_tfm(tfm); 61 struct akcipher_alg *alg = crypto_akcipher_alg(akcipher); 62 63 alg->exit(akcipher); 64 } 65 66 static int crypto_akcipher_init_tfm(struct crypto_tfm *tfm) 67 { 68 struct crypto_akcipher *akcipher = __crypto_akcipher_tfm(tfm); 69 struct akcipher_alg *alg = crypto_akcipher_alg(akcipher); 70 71 if (alg->exit) 72 akcipher->base.exit = crypto_akcipher_exit_tfm; 73 74 if (alg->init) 75 return alg->init(akcipher); 76 77 return 0; 78 } 79 80 static void crypto_akcipher_free_instance(struct crypto_instance *inst) 81 { 82 struct akcipher_instance *akcipher = akcipher_instance(inst); 83 84 akcipher->free(akcipher); 85 } 86 87 static const struct crypto_type crypto_akcipher_type = { 88 .extsize = crypto_alg_extsize, 89 .init_tfm = crypto_akcipher_init_tfm, 90 .free = crypto_akcipher_free_instance, 91 #ifdef CONFIG_PROC_FS 92 .show = crypto_akcipher_show, 93 #endif 94 .report = crypto_akcipher_report, 95 .maskclear = ~CRYPTO_ALG_TYPE_MASK, 96 .maskset = CRYPTO_ALG_TYPE_MASK, 97 .type = CRYPTO_ALG_TYPE_AKCIPHER, 98 .tfmsize = offsetof(struct crypto_akcipher, base), 99 }; 100 101 int crypto_grab_akcipher(struct crypto_akcipher_spawn *spawn, const char *name, 102 u32 type, u32 mask) 103 { 104 spawn->base.frontend = &crypto_akcipher_type; 105 return crypto_grab_spawn(&spawn->base, name, type, mask); 106 } 107 EXPORT_SYMBOL_GPL(crypto_grab_akcipher); 108 109 struct crypto_akcipher *crypto_alloc_akcipher(const char *alg_name, u32 type, 110 u32 mask) 111 { 112 return crypto_alloc_tfm(alg_name, &crypto_akcipher_type, type, mask); 113 } 114 EXPORT_SYMBOL_GPL(crypto_alloc_akcipher); 115 116 static void akcipher_prepare_alg(struct akcipher_alg *alg) 117 { 118 struct crypto_alg *base = &alg->base; 119 120 base->cra_type = &crypto_akcipher_type; 121 base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK; 122 base->cra_flags |= CRYPTO_ALG_TYPE_AKCIPHER; 123 } 124 125 int crypto_register_akcipher(struct akcipher_alg *alg) 126 { 127 struct crypto_alg *base = &alg->base; 128 129 akcipher_prepare_alg(alg); 130 return crypto_register_alg(base); 131 } 132 EXPORT_SYMBOL_GPL(crypto_register_akcipher); 133 134 void crypto_unregister_akcipher(struct akcipher_alg *alg) 135 { 136 crypto_unregister_alg(&alg->base); 137 } 138 EXPORT_SYMBOL_GPL(crypto_unregister_akcipher); 139 140 int akcipher_register_instance(struct crypto_template *tmpl, 141 struct akcipher_instance *inst) 142 { 143 akcipher_prepare_alg(&inst->alg); 144 return crypto_register_instance(tmpl, akcipher_crypto_instance(inst)); 145 } 146 EXPORT_SYMBOL_GPL(akcipher_register_instance); 147 148 MODULE_LICENSE("GPL"); 149 MODULE_DESCRIPTION("Generic public key cipher type"); 150