1 /* 2 * Key-agreement Protocol Primitives (KPP) 3 * 4 * Copyright (c) 2016, Intel Corporation 5 * Authors: Salvatore Benedetto <salvatore.benedetto@intel.com> 6 * 7 * This program is free software; you can redistribute it and/or modify it 8 * under the terms of the GNU General Public License as published by the Free 9 * Software Foundation; either version 2 of the License, or (at your option) 10 * any later version. 11 * 12 */ 13 #include <linux/errno.h> 14 #include <linux/kernel.h> 15 #include <linux/module.h> 16 #include <linux/seq_file.h> 17 #include <linux/slab.h> 18 #include <linux/string.h> 19 #include <linux/crypto.h> 20 #include <crypto/algapi.h> 21 #include <linux/cryptouser.h> 22 #include <linux/compiler.h> 23 #include <net/netlink.h> 24 #include <crypto/kpp.h> 25 #include <crypto/internal/kpp.h> 26 #include "internal.h" 27 28 #ifdef CONFIG_NET 29 static int crypto_kpp_report(struct sk_buff *skb, struct crypto_alg *alg) 30 { 31 struct crypto_report_kpp rkpp; 32 33 memset(&rkpp, 0, sizeof(rkpp)); 34 35 strscpy(rkpp.type, "kpp", sizeof(rkpp.type)); 36 37 return nla_put(skb, CRYPTOCFGA_REPORT_KPP, sizeof(rkpp), &rkpp); 38 } 39 #else 40 static int crypto_kpp_report(struct sk_buff *skb, struct crypto_alg *alg) 41 { 42 return -ENOSYS; 43 } 44 #endif 45 46 static void crypto_kpp_show(struct seq_file *m, struct crypto_alg *alg) 47 __maybe_unused; 48 49 static void crypto_kpp_show(struct seq_file *m, struct crypto_alg *alg) 50 { 51 seq_puts(m, "type : kpp\n"); 52 } 53 54 static void crypto_kpp_exit_tfm(struct crypto_tfm *tfm) 55 { 56 struct crypto_kpp *kpp = __crypto_kpp_tfm(tfm); 57 struct kpp_alg *alg = crypto_kpp_alg(kpp); 58 59 alg->exit(kpp); 60 } 61 62 static int crypto_kpp_init_tfm(struct crypto_tfm *tfm) 63 { 64 struct crypto_kpp *kpp = __crypto_kpp_tfm(tfm); 65 struct kpp_alg *alg = crypto_kpp_alg(kpp); 66 67 if (alg->exit) 68 kpp->base.exit = crypto_kpp_exit_tfm; 69 70 if (alg->init) 71 return alg->init(kpp); 72 73 return 0; 74 } 75 76 static const struct crypto_type crypto_kpp_type = { 77 .extsize = crypto_alg_extsize, 78 .init_tfm = crypto_kpp_init_tfm, 79 #ifdef CONFIG_PROC_FS 80 .show = crypto_kpp_show, 81 #endif 82 .report = crypto_kpp_report, 83 .maskclear = ~CRYPTO_ALG_TYPE_MASK, 84 .maskset = CRYPTO_ALG_TYPE_MASK, 85 .type = CRYPTO_ALG_TYPE_KPP, 86 .tfmsize = offsetof(struct crypto_kpp, base), 87 }; 88 89 struct crypto_kpp *crypto_alloc_kpp(const char *alg_name, u32 type, u32 mask) 90 { 91 return crypto_alloc_tfm(alg_name, &crypto_kpp_type, type, mask); 92 } 93 EXPORT_SYMBOL_GPL(crypto_alloc_kpp); 94 95 static void kpp_prepare_alg(struct kpp_alg *alg) 96 { 97 struct crypto_alg *base = &alg->base; 98 99 base->cra_type = &crypto_kpp_type; 100 base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK; 101 base->cra_flags |= CRYPTO_ALG_TYPE_KPP; 102 } 103 104 int crypto_register_kpp(struct kpp_alg *alg) 105 { 106 struct crypto_alg *base = &alg->base; 107 108 kpp_prepare_alg(alg); 109 return crypto_register_alg(base); 110 } 111 EXPORT_SYMBOL_GPL(crypto_register_kpp); 112 113 void crypto_unregister_kpp(struct kpp_alg *alg) 114 { 115 crypto_unregister_alg(&alg->base); 116 } 117 EXPORT_SYMBOL_GPL(crypto_unregister_kpp); 118 119 MODULE_LICENSE("GPL"); 120 MODULE_DESCRIPTION("Key-agreement Protocol Primitives"); 121