1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 /* 3 * Public Key Signature Algorithm 4 * 5 * Copyright (c) 2023 Herbert Xu <herbert@gondor.apana.org.au> 6 */ 7 8 #include <crypto/internal/sig.h> 9 #include <linux/cryptouser.h> 10 #include <linux/kernel.h> 11 #include <linux/module.h> 12 #include <linux/seq_file.h> 13 #include <linux/string.h> 14 #include <net/netlink.h> 15 16 #include "internal.h" 17 18 #define CRYPTO_ALG_TYPE_SIG_MASK 0x0000000e 19 20 static void crypto_sig_exit_tfm(struct crypto_tfm *tfm) 21 { 22 struct crypto_sig *sig = __crypto_sig_tfm(tfm); 23 struct sig_alg *alg = crypto_sig_alg(sig); 24 25 alg->exit(sig); 26 } 27 28 static int crypto_sig_init_tfm(struct crypto_tfm *tfm) 29 { 30 struct crypto_sig *sig = __crypto_sig_tfm(tfm); 31 struct sig_alg *alg = crypto_sig_alg(sig); 32 33 if (alg->exit) 34 sig->base.exit = crypto_sig_exit_tfm; 35 36 if (alg->init) 37 return alg->init(sig); 38 39 return 0; 40 } 41 42 static void crypto_sig_free_instance(struct crypto_instance *inst) 43 { 44 struct sig_instance *sig = sig_instance(inst); 45 46 sig->free(sig); 47 } 48 49 static void __maybe_unused crypto_sig_show(struct seq_file *m, 50 struct crypto_alg *alg) 51 { 52 seq_puts(m, "type : sig\n"); 53 } 54 55 static int __maybe_unused crypto_sig_report(struct sk_buff *skb, 56 struct crypto_alg *alg) 57 { 58 struct crypto_report_sig rsig = {}; 59 60 strscpy(rsig.type, "sig", sizeof(rsig.type)); 61 62 return nla_put(skb, CRYPTOCFGA_REPORT_SIG, sizeof(rsig), &rsig); 63 } 64 65 static const struct crypto_type crypto_sig_type = { 66 .extsize = crypto_alg_extsize, 67 .init_tfm = crypto_sig_init_tfm, 68 .free = crypto_sig_free_instance, 69 #ifdef CONFIG_PROC_FS 70 .show = crypto_sig_show, 71 #endif 72 #if IS_ENABLED(CONFIG_CRYPTO_USER) 73 .report = crypto_sig_report, 74 #endif 75 .maskclear = ~CRYPTO_ALG_TYPE_MASK, 76 .maskset = CRYPTO_ALG_TYPE_SIG_MASK, 77 .type = CRYPTO_ALG_TYPE_SIG, 78 .tfmsize = offsetof(struct crypto_sig, base), 79 }; 80 81 struct crypto_sig *crypto_alloc_sig(const char *alg_name, u32 type, u32 mask) 82 { 83 return crypto_alloc_tfm(alg_name, &crypto_sig_type, type, mask); 84 } 85 EXPORT_SYMBOL_GPL(crypto_alloc_sig); 86 87 static void sig_prepare_alg(struct sig_alg *alg) 88 { 89 struct crypto_alg *base = &alg->base; 90 91 base->cra_type = &crypto_sig_type; 92 base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK; 93 base->cra_flags |= CRYPTO_ALG_TYPE_SIG; 94 } 95 96 static int sig_default_sign(struct crypto_sig *tfm, 97 const void *src, unsigned int slen, 98 void *dst, unsigned int dlen) 99 { 100 return -ENOSYS; 101 } 102 103 static int sig_default_verify(struct crypto_sig *tfm, 104 const void *src, unsigned int slen, 105 const void *dst, unsigned int dlen) 106 { 107 return -ENOSYS; 108 } 109 110 static int sig_default_set_key(struct crypto_sig *tfm, 111 const void *key, unsigned int keylen) 112 { 113 return -ENOSYS; 114 } 115 116 int crypto_register_sig(struct sig_alg *alg) 117 { 118 struct crypto_alg *base = &alg->base; 119 120 if (!alg->sign) 121 alg->sign = sig_default_sign; 122 if (!alg->verify) 123 alg->verify = sig_default_verify; 124 if (!alg->set_priv_key) 125 alg->set_priv_key = sig_default_set_key; 126 if (!alg->set_pub_key) 127 return -EINVAL; 128 if (!alg->key_size) 129 return -EINVAL; 130 if (!alg->max_size) 131 alg->max_size = alg->key_size; 132 if (!alg->digest_size) 133 alg->digest_size = alg->key_size; 134 135 sig_prepare_alg(alg); 136 return crypto_register_alg(base); 137 } 138 EXPORT_SYMBOL_GPL(crypto_register_sig); 139 140 void crypto_unregister_sig(struct sig_alg *alg) 141 { 142 crypto_unregister_alg(&alg->base); 143 } 144 EXPORT_SYMBOL_GPL(crypto_unregister_sig); 145 146 int sig_register_instance(struct crypto_template *tmpl, 147 struct sig_instance *inst) 148 { 149 if (WARN_ON(!inst->free)) 150 return -EINVAL; 151 sig_prepare_alg(&inst->alg); 152 return crypto_register_instance(tmpl, sig_crypto_instance(inst)); 153 } 154 EXPORT_SYMBOL_GPL(sig_register_instance); 155 156 int crypto_grab_sig(struct crypto_sig_spawn *spawn, 157 struct crypto_instance *inst, 158 const char *name, u32 type, u32 mask) 159 { 160 spawn->base.frontend = &crypto_sig_type; 161 return crypto_grab_spawn(&spawn->base, inst, name, type, mask); 162 } 163 EXPORT_SYMBOL_GPL(crypto_grab_sig); 164 165 MODULE_LICENSE("GPL"); 166 MODULE_DESCRIPTION("Public Key Signature Algorithms"); 167