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