1 /* 2 * Cryptographic API. 3 * 4 * Copyright (c) 2002 James Morris <jmorris@intercode.com.au> 5 * Copyright (c) 2005 Herbert Xu <herbert@gondor.apana.org.au> 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 #ifndef _CRYPTO_INTERNAL_H 14 #define _CRYPTO_INTERNAL_H 15 16 #include <crypto/algapi.h> 17 #include <linux/completion.h> 18 #include <linux/mm.h> 19 #include <linux/highmem.h> 20 #include <linux/interrupt.h> 21 #include <linux/init.h> 22 #include <linux/list.h> 23 #include <linux/module.h> 24 #include <linux/kernel.h> 25 #include <linux/notifier.h> 26 #include <linux/rwsem.h> 27 #include <linux/slab.h> 28 #include <asm/kmap_types.h> 29 30 /* Crypto notification events. */ 31 enum { 32 CRYPTO_MSG_ALG_REQUEST, 33 CRYPTO_MSG_ALG_REGISTER, 34 CRYPTO_MSG_ALG_UNREGISTER, 35 CRYPTO_MSG_TMPL_REGISTER, 36 CRYPTO_MSG_TMPL_UNREGISTER, 37 }; 38 39 struct crypto_instance; 40 struct crypto_template; 41 42 struct crypto_larval { 43 struct crypto_alg alg; 44 struct crypto_alg *adult; 45 struct completion completion; 46 u32 mask; 47 }; 48 49 extern struct list_head crypto_alg_list; 50 extern struct rw_semaphore crypto_alg_sem; 51 extern struct blocking_notifier_head crypto_chain; 52 53 extern enum km_type crypto_km_types[]; 54 55 static inline enum km_type crypto_kmap_type(int out) 56 { 57 return crypto_km_types[(in_softirq() ? 2 : 0) + out]; 58 } 59 60 static inline void *crypto_kmap(struct page *page, int out) 61 { 62 return kmap_atomic(page, crypto_kmap_type(out)); 63 } 64 65 static inline void crypto_kunmap(void *vaddr, int out) 66 { 67 kunmap_atomic(vaddr, crypto_kmap_type(out)); 68 } 69 70 static inline void crypto_yield(u32 flags) 71 { 72 if (flags & CRYPTO_TFM_REQ_MAY_SLEEP) 73 cond_resched(); 74 } 75 76 #ifdef CONFIG_PROC_FS 77 void __init crypto_init_proc(void); 78 void __exit crypto_exit_proc(void); 79 #else 80 static inline void crypto_init_proc(void) 81 { } 82 static inline void crypto_exit_proc(void) 83 { } 84 #endif 85 86 static inline unsigned int crypto_digest_ctxsize(struct crypto_alg *alg) 87 { 88 unsigned int len = alg->cra_ctxsize; 89 90 if (alg->cra_alignmask) { 91 len = ALIGN(len, (unsigned long)alg->cra_alignmask + 1); 92 len += alg->cra_digest.dia_digestsize; 93 } 94 95 return len; 96 } 97 98 static inline unsigned int crypto_cipher_ctxsize(struct crypto_alg *alg) 99 { 100 return alg->cra_ctxsize; 101 } 102 103 static inline unsigned int crypto_compress_ctxsize(struct crypto_alg *alg) 104 { 105 return alg->cra_ctxsize; 106 } 107 108 struct crypto_alg *crypto_mod_get(struct crypto_alg *alg); 109 struct crypto_alg *__crypto_alg_lookup(const char *name, u32 type, u32 mask); 110 struct crypto_alg *crypto_alg_mod_lookup(const char *name, u32 type, u32 mask); 111 112 int crypto_init_digest_ops(struct crypto_tfm *tfm); 113 int crypto_init_cipher_ops(struct crypto_tfm *tfm); 114 int crypto_init_compress_ops(struct crypto_tfm *tfm); 115 116 void crypto_exit_digest_ops(struct crypto_tfm *tfm); 117 void crypto_exit_cipher_ops(struct crypto_tfm *tfm); 118 void crypto_exit_compress_ops(struct crypto_tfm *tfm); 119 120 void crypto_larval_error(const char *name, u32 type, u32 mask); 121 122 void crypto_shoot_alg(struct crypto_alg *alg); 123 struct crypto_tfm *__crypto_alloc_tfm(struct crypto_alg *alg, u32 type, 124 u32 mask); 125 126 int crypto_register_instance(struct crypto_template *tmpl, 127 struct crypto_instance *inst); 128 129 int crypto_register_notifier(struct notifier_block *nb); 130 int crypto_unregister_notifier(struct notifier_block *nb); 131 132 static inline void crypto_alg_put(struct crypto_alg *alg) 133 { 134 if (atomic_dec_and_test(&alg->cra_refcnt) && alg->cra_destroy) 135 alg->cra_destroy(alg); 136 } 137 138 static inline int crypto_tmpl_get(struct crypto_template *tmpl) 139 { 140 return try_module_get(tmpl->module); 141 } 142 143 static inline void crypto_tmpl_put(struct crypto_template *tmpl) 144 { 145 module_put(tmpl->module); 146 } 147 148 static inline int crypto_is_larval(struct crypto_alg *alg) 149 { 150 return alg->cra_flags & CRYPTO_ALG_LARVAL; 151 } 152 153 static inline int crypto_is_dead(struct crypto_alg *alg) 154 { 155 return alg->cra_flags & CRYPTO_ALG_DEAD; 156 } 157 158 static inline int crypto_is_moribund(struct crypto_alg *alg) 159 { 160 return alg->cra_flags & (CRYPTO_ALG_DEAD | CRYPTO_ALG_DYING); 161 } 162 163 static inline int crypto_notify(unsigned long val, void *v) 164 { 165 return blocking_notifier_call_chain(&crypto_chain, val, v); 166 } 167 168 #endif /* _CRYPTO_INTERNAL_H */ 169 170