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 crypto_kpp_show(struct seq_file *m, struct crypto_alg *alg) 33 __maybe_unused; 34 35 static void crypto_kpp_show(struct seq_file *m, struct crypto_alg *alg) 36 { 37 seq_puts(m, "type : kpp\n"); 38 } 39 40 static void crypto_kpp_exit_tfm(struct crypto_tfm *tfm) 41 { 42 struct crypto_kpp *kpp = __crypto_kpp_tfm(tfm); 43 struct kpp_alg *alg = crypto_kpp_alg(kpp); 44 45 alg->exit(kpp); 46 } 47 48 static int crypto_kpp_init_tfm(struct crypto_tfm *tfm) 49 { 50 struct crypto_kpp *kpp = __crypto_kpp_tfm(tfm); 51 struct kpp_alg *alg = crypto_kpp_alg(kpp); 52 53 if (alg->exit) 54 kpp->base.exit = crypto_kpp_exit_tfm; 55 56 if (alg->init) 57 return alg->init(kpp); 58 59 return 0; 60 } 61 62 static void crypto_kpp_free_instance(struct crypto_instance *inst) 63 { 64 struct kpp_instance *kpp = kpp_instance(inst); 65 66 kpp->free(kpp); 67 } 68 69 static const struct crypto_type crypto_kpp_type = { 70 .extsize = crypto_alg_extsize, 71 .init_tfm = crypto_kpp_init_tfm, 72 .free = crypto_kpp_free_instance, 73 #ifdef CONFIG_PROC_FS 74 .show = crypto_kpp_show, 75 #endif 76 #if IS_ENABLED(CONFIG_CRYPTO_USER) 77 .report = crypto_kpp_report, 78 #endif 79 .maskclear = ~CRYPTO_ALG_TYPE_MASK, 80 .maskset = CRYPTO_ALG_TYPE_MASK, 81 .type = CRYPTO_ALG_TYPE_KPP, 82 .tfmsize = offsetof(struct crypto_kpp, base), 83 }; 84 85 struct crypto_kpp *crypto_alloc_kpp(const char *alg_name, u32 type, u32 mask) 86 { 87 return crypto_alloc_tfm(alg_name, &crypto_kpp_type, type, mask); 88 } 89 EXPORT_SYMBOL_GPL(crypto_alloc_kpp); 90 91 int crypto_grab_kpp(struct crypto_kpp_spawn *spawn, 92 struct crypto_instance *inst, 93 const char *name, u32 type, u32 mask) 94 { 95 spawn->base.frontend = &crypto_kpp_type; 96 return crypto_grab_spawn(&spawn->base, inst, name, type, mask); 97 } 98 EXPORT_SYMBOL_GPL(crypto_grab_kpp); 99 100 int crypto_has_kpp(const char *alg_name, u32 type, u32 mask) 101 { 102 return crypto_type_has_alg(alg_name, &crypto_kpp_type, type, mask); 103 } 104 EXPORT_SYMBOL_GPL(crypto_has_kpp); 105 106 static void kpp_prepare_alg(struct kpp_alg *alg) 107 { 108 struct crypto_alg *base = &alg->base; 109 110 base->cra_type = &crypto_kpp_type; 111 base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK; 112 base->cra_flags |= CRYPTO_ALG_TYPE_KPP; 113 } 114 115 int crypto_register_kpp(struct kpp_alg *alg) 116 { 117 struct crypto_alg *base = &alg->base; 118 119 kpp_prepare_alg(alg); 120 return crypto_register_alg(base); 121 } 122 EXPORT_SYMBOL_GPL(crypto_register_kpp); 123 124 void crypto_unregister_kpp(struct kpp_alg *alg) 125 { 126 crypto_unregister_alg(&alg->base); 127 } 128 EXPORT_SYMBOL_GPL(crypto_unregister_kpp); 129 130 int kpp_register_instance(struct crypto_template *tmpl, 131 struct kpp_instance *inst) 132 { 133 if (WARN_ON(!inst->free)) 134 return -EINVAL; 135 136 kpp_prepare_alg(&inst->alg); 137 138 return crypto_register_instance(tmpl, kpp_crypto_instance(inst)); 139 } 140 EXPORT_SYMBOL_GPL(kpp_register_instance); 141 142 MODULE_LICENSE("GPL"); 143 MODULE_DESCRIPTION("Key-agreement Protocol Primitives"); 144