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