1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Public Key Encryption 4 * 5 * Copyright (c) 2015, Intel Corporation 6 * Authors: Tadeusz Struk <tadeusz.struk@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 <linux/compiler.h> 16 #include <crypto/algapi.h> 17 #include <linux/cryptouser.h> 18 #include <net/netlink.h> 19 #include <crypto/akcipher.h> 20 #include <crypto/internal/akcipher.h> 21 #include "internal.h" 22 23 #ifdef CONFIG_NET 24 static int crypto_akcipher_report(struct sk_buff *skb, struct crypto_alg *alg) 25 { 26 struct crypto_report_akcipher rakcipher; 27 28 memset(&rakcipher, 0, sizeof(rakcipher)); 29 30 strscpy(rakcipher.type, "akcipher", sizeof(rakcipher.type)); 31 32 return nla_put(skb, CRYPTOCFGA_REPORT_AKCIPHER, 33 sizeof(rakcipher), &rakcipher); 34 } 35 #else 36 static int crypto_akcipher_report(struct sk_buff *skb, struct crypto_alg *alg) 37 { 38 return -ENOSYS; 39 } 40 #endif 41 42 static void crypto_akcipher_show(struct seq_file *m, struct crypto_alg *alg) 43 __maybe_unused; 44 45 static void crypto_akcipher_show(struct seq_file *m, struct crypto_alg *alg) 46 { 47 seq_puts(m, "type : akcipher\n"); 48 } 49 50 static void crypto_akcipher_exit_tfm(struct crypto_tfm *tfm) 51 { 52 struct crypto_akcipher *akcipher = __crypto_akcipher_tfm(tfm); 53 struct akcipher_alg *alg = crypto_akcipher_alg(akcipher); 54 55 alg->exit(akcipher); 56 } 57 58 static int crypto_akcipher_init_tfm(struct crypto_tfm *tfm) 59 { 60 struct crypto_akcipher *akcipher = __crypto_akcipher_tfm(tfm); 61 struct akcipher_alg *alg = crypto_akcipher_alg(akcipher); 62 63 if (alg->exit) 64 akcipher->base.exit = crypto_akcipher_exit_tfm; 65 66 if (alg->init) 67 return alg->init(akcipher); 68 69 return 0; 70 } 71 72 static void crypto_akcipher_free_instance(struct crypto_instance *inst) 73 { 74 struct akcipher_instance *akcipher = akcipher_instance(inst); 75 76 akcipher->free(akcipher); 77 } 78 79 static const struct crypto_type crypto_akcipher_type = { 80 .extsize = crypto_alg_extsize, 81 .init_tfm = crypto_akcipher_init_tfm, 82 .free = crypto_akcipher_free_instance, 83 #ifdef CONFIG_PROC_FS 84 .show = crypto_akcipher_show, 85 #endif 86 .report = crypto_akcipher_report, 87 .maskclear = ~CRYPTO_ALG_TYPE_MASK, 88 .maskset = CRYPTO_ALG_TYPE_MASK, 89 .type = CRYPTO_ALG_TYPE_AKCIPHER, 90 .tfmsize = offsetof(struct crypto_akcipher, base), 91 }; 92 93 int crypto_grab_akcipher(struct crypto_akcipher_spawn *spawn, 94 struct crypto_instance *inst, 95 const char *name, u32 type, u32 mask) 96 { 97 spawn->base.frontend = &crypto_akcipher_type; 98 return crypto_grab_spawn(&spawn->base, inst, name, type, mask); 99 } 100 EXPORT_SYMBOL_GPL(crypto_grab_akcipher); 101 102 struct crypto_akcipher *crypto_alloc_akcipher(const char *alg_name, u32 type, 103 u32 mask) 104 { 105 return crypto_alloc_tfm(alg_name, &crypto_akcipher_type, type, mask); 106 } 107 EXPORT_SYMBOL_GPL(crypto_alloc_akcipher); 108 109 static void akcipher_prepare_alg(struct akcipher_alg *alg) 110 { 111 struct crypto_alg *base = &alg->base; 112 113 base->cra_type = &crypto_akcipher_type; 114 base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK; 115 base->cra_flags |= CRYPTO_ALG_TYPE_AKCIPHER; 116 } 117 118 static int akcipher_default_op(struct akcipher_request *req) 119 { 120 return -ENOSYS; 121 } 122 123 int crypto_register_akcipher(struct akcipher_alg *alg) 124 { 125 struct crypto_alg *base = &alg->base; 126 127 if (!alg->sign) 128 alg->sign = akcipher_default_op; 129 if (!alg->verify) 130 alg->verify = akcipher_default_op; 131 if (!alg->encrypt) 132 alg->encrypt = akcipher_default_op; 133 if (!alg->decrypt) 134 alg->decrypt = akcipher_default_op; 135 136 akcipher_prepare_alg(alg); 137 return crypto_register_alg(base); 138 } 139 EXPORT_SYMBOL_GPL(crypto_register_akcipher); 140 141 void crypto_unregister_akcipher(struct akcipher_alg *alg) 142 { 143 crypto_unregister_alg(&alg->base); 144 } 145 EXPORT_SYMBOL_GPL(crypto_unregister_akcipher); 146 147 int akcipher_register_instance(struct crypto_template *tmpl, 148 struct akcipher_instance *inst) 149 { 150 if (WARN_ON(!inst->free)) 151 return -EINVAL; 152 akcipher_prepare_alg(&inst->alg); 153 return crypto_register_instance(tmpl, akcipher_crypto_instance(inst)); 154 } 155 EXPORT_SYMBOL_GPL(akcipher_register_instance); 156 157 MODULE_LICENSE("GPL"); 158 MODULE_DESCRIPTION("Generic public key cipher type"); 159