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 const struct crypto_type crypto_kpp_type = { 72 .extsize = crypto_alg_extsize, 73 .init_tfm = crypto_kpp_init_tfm, 74 #ifdef CONFIG_PROC_FS 75 .show = crypto_kpp_show, 76 #endif 77 .report = crypto_kpp_report, 78 .maskclear = ~CRYPTO_ALG_TYPE_MASK, 79 .maskset = CRYPTO_ALG_TYPE_MASK, 80 .type = CRYPTO_ALG_TYPE_KPP, 81 .tfmsize = offsetof(struct crypto_kpp, 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 static void kpp_prepare_alg(struct kpp_alg *alg) 91 { 92 struct crypto_alg *base = &alg->base; 93 94 base->cra_type = &crypto_kpp_type; 95 base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK; 96 base->cra_flags |= CRYPTO_ALG_TYPE_KPP; 97 } 98 99 int crypto_register_kpp(struct kpp_alg *alg) 100 { 101 struct crypto_alg *base = &alg->base; 102 103 kpp_prepare_alg(alg); 104 return crypto_register_alg(base); 105 } 106 EXPORT_SYMBOL_GPL(crypto_register_kpp); 107 108 void crypto_unregister_kpp(struct kpp_alg *alg) 109 { 110 crypto_unregister_alg(&alg->base); 111 } 112 EXPORT_SYMBOL_GPL(crypto_unregister_kpp); 113 114 MODULE_LICENSE("GPL"); 115 MODULE_DESCRIPTION("Key-agreement Protocol Primitives"); 116