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 strncpy(rkpp.type, "kpp", sizeof(rkpp.type)); 34 35 if (nla_put(skb, CRYPTOCFGA_REPORT_KPP, 36 sizeof(struct crypto_report_kpp), &rkpp)) 37 goto nla_put_failure; 38 return 0; 39 40 nla_put_failure: 41 return -EMSGSIZE; 42 } 43 #else 44 static int crypto_kpp_report(struct sk_buff *skb, struct crypto_alg *alg) 45 { 46 return -ENOSYS; 47 } 48 #endif 49 50 static void crypto_kpp_show(struct seq_file *m, struct crypto_alg *alg) 51 __maybe_unused; 52 53 static void crypto_kpp_show(struct seq_file *m, struct crypto_alg *alg) 54 { 55 seq_puts(m, "type : kpp\n"); 56 } 57 58 static void crypto_kpp_exit_tfm(struct crypto_tfm *tfm) 59 { 60 struct crypto_kpp *kpp = __crypto_kpp_tfm(tfm); 61 struct kpp_alg *alg = crypto_kpp_alg(kpp); 62 63 alg->exit(kpp); 64 } 65 66 static int crypto_kpp_init_tfm(struct crypto_tfm *tfm) 67 { 68 struct crypto_kpp *kpp = __crypto_kpp_tfm(tfm); 69 struct kpp_alg *alg = crypto_kpp_alg(kpp); 70 71 if (alg->exit) 72 kpp->base.exit = crypto_kpp_exit_tfm; 73 74 if (alg->init) 75 return alg->init(kpp); 76 77 return 0; 78 } 79 80 static const struct crypto_type crypto_kpp_type = { 81 .extsize = crypto_alg_extsize, 82 .init_tfm = crypto_kpp_init_tfm, 83 #ifdef CONFIG_PROC_FS 84 .show = crypto_kpp_show, 85 #endif 86 .report = crypto_kpp_report, 87 .maskclear = ~CRYPTO_ALG_TYPE_MASK, 88 .maskset = CRYPTO_ALG_TYPE_MASK, 89 .type = CRYPTO_ALG_TYPE_KPP, 90 .tfmsize = offsetof(struct crypto_kpp, base), 91 }; 92 93 struct crypto_kpp *crypto_alloc_kpp(const char *alg_name, u32 type, u32 mask) 94 { 95 return crypto_alloc_tfm(alg_name, &crypto_kpp_type, type, mask); 96 } 97 EXPORT_SYMBOL_GPL(crypto_alloc_kpp); 98 99 static void kpp_prepare_alg(struct kpp_alg *alg) 100 { 101 struct crypto_alg *base = &alg->base; 102 103 base->cra_type = &crypto_kpp_type; 104 base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK; 105 base->cra_flags |= CRYPTO_ALG_TYPE_KPP; 106 } 107 108 int crypto_register_kpp(struct kpp_alg *alg) 109 { 110 struct crypto_alg *base = &alg->base; 111 112 kpp_prepare_alg(alg); 113 return crypto_register_alg(base); 114 } 115 EXPORT_SYMBOL_GPL(crypto_register_kpp); 116 117 void crypto_unregister_kpp(struct kpp_alg *alg) 118 { 119 crypto_unregister_alg(&alg->base); 120 } 121 EXPORT_SYMBOL_GPL(crypto_unregister_kpp); 122 123 MODULE_LICENSE("GPL"); 124 MODULE_DESCRIPTION("Key-agreement Protocol Primitives"); 125