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