1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Key-agreement Protocol Primitives (KPP) 4 * 5 * Copyright (c) 2016, Intel Corporation 6 * Authors: Salvatore Benedetto <salvatore.benedetto@intel.com> 7 */ 8 #include <linux/errno.h> 9 #include <linux/kernel.h> 10 #include <linux/module.h> 11 #include <linux/seq_file.h> 12 #include <linux/slab.h> 13 #include <linux/string.h> 14 #include <linux/crypto.h> 15 #include <crypto/algapi.h> 16 #include <linux/cryptouser.h> 17 #include <linux/compiler.h> 18 #include <net/netlink.h> 19 #include <crypto/kpp.h> 20 #include <crypto/internal/kpp.h> 21 #include "internal.h" 22 23 #ifdef CONFIG_NET 24 static int crypto_kpp_report(struct sk_buff *skb, struct crypto_alg *alg) 25 { 26 struct crypto_report_kpp rkpp; 27 28 memset(&rkpp, 0, sizeof(rkpp)); 29 30 strscpy(rkpp.type, "kpp", sizeof(rkpp.type)); 31 32 return nla_put(skb, CRYPTOCFGA_REPORT_KPP, sizeof(rkpp), &rkpp); 33 } 34 #else 35 static int crypto_kpp_report(struct sk_buff *skb, struct crypto_alg *alg) 36 { 37 return -ENOSYS; 38 } 39 #endif 40 41 static void crypto_kpp_show(struct seq_file *m, struct crypto_alg *alg) 42 __maybe_unused; 43 44 static void crypto_kpp_show(struct seq_file *m, struct crypto_alg *alg) 45 { 46 seq_puts(m, "type : kpp\n"); 47 } 48 49 static void crypto_kpp_exit_tfm(struct crypto_tfm *tfm) 50 { 51 struct crypto_kpp *kpp = __crypto_kpp_tfm(tfm); 52 struct kpp_alg *alg = crypto_kpp_alg(kpp); 53 54 alg->exit(kpp); 55 } 56 57 static int crypto_kpp_init_tfm(struct crypto_tfm *tfm) 58 { 59 struct crypto_kpp *kpp = __crypto_kpp_tfm(tfm); 60 struct kpp_alg *alg = crypto_kpp_alg(kpp); 61 62 if (alg->exit) 63 kpp->base.exit = crypto_kpp_exit_tfm; 64 65 if (alg->init) 66 return alg->init(kpp); 67 68 return 0; 69 } 70 71 static void crypto_kpp_free_instance(struct crypto_instance *inst) 72 { 73 struct kpp_instance *kpp = kpp_instance(inst); 74 75 kpp->free(kpp); 76 } 77 78 static const struct crypto_type crypto_kpp_type = { 79 .extsize = crypto_alg_extsize, 80 .init_tfm = crypto_kpp_init_tfm, 81 .free = crypto_kpp_free_instance, 82 #ifdef CONFIG_PROC_FS 83 .show = crypto_kpp_show, 84 #endif 85 .report = crypto_kpp_report, 86 .maskclear = ~CRYPTO_ALG_TYPE_MASK, 87 .maskset = CRYPTO_ALG_TYPE_MASK, 88 .type = CRYPTO_ALG_TYPE_KPP, 89 .tfmsize = offsetof(struct crypto_kpp, base), 90 }; 91 92 struct crypto_kpp *crypto_alloc_kpp(const char *alg_name, u32 type, u32 mask) 93 { 94 return crypto_alloc_tfm(alg_name, &crypto_kpp_type, type, mask); 95 } 96 EXPORT_SYMBOL_GPL(crypto_alloc_kpp); 97 98 int crypto_grab_kpp(struct crypto_kpp_spawn *spawn, 99 struct crypto_instance *inst, 100 const char *name, u32 type, u32 mask) 101 { 102 spawn->base.frontend = &crypto_kpp_type; 103 return crypto_grab_spawn(&spawn->base, inst, name, type, mask); 104 } 105 EXPORT_SYMBOL_GPL(crypto_grab_kpp); 106 107 int crypto_has_kpp(const char *alg_name, u32 type, u32 mask) 108 { 109 return crypto_type_has_alg(alg_name, &crypto_kpp_type, type, mask); 110 } 111 EXPORT_SYMBOL_GPL(crypto_has_kpp); 112 113 static void kpp_prepare_alg(struct kpp_alg *alg) 114 { 115 struct crypto_alg *base = &alg->base; 116 117 base->cra_type = &crypto_kpp_type; 118 base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK; 119 base->cra_flags |= CRYPTO_ALG_TYPE_KPP; 120 } 121 122 int crypto_register_kpp(struct kpp_alg *alg) 123 { 124 struct crypto_alg *base = &alg->base; 125 126 kpp_prepare_alg(alg); 127 return crypto_register_alg(base); 128 } 129 EXPORT_SYMBOL_GPL(crypto_register_kpp); 130 131 void crypto_unregister_kpp(struct kpp_alg *alg) 132 { 133 crypto_unregister_alg(&alg->base); 134 } 135 EXPORT_SYMBOL_GPL(crypto_unregister_kpp); 136 137 int kpp_register_instance(struct crypto_template *tmpl, 138 struct kpp_instance *inst) 139 { 140 if (WARN_ON(!inst->free)) 141 return -EINVAL; 142 143 kpp_prepare_alg(&inst->alg); 144 145 return crypto_register_instance(tmpl, kpp_crypto_instance(inst)); 146 } 147 EXPORT_SYMBOL_GPL(kpp_register_instance); 148 149 MODULE_LICENSE("GPL"); 150 MODULE_DESCRIPTION("Key-agreement Protocol Primitives"); 151