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 int flags) 88 { 89 unsigned int len = alg->cra_ctxsize; 90 91 if (alg->cra_alignmask) { 92 len = ALIGN(len, (unsigned long)alg->cra_alignmask + 1); 93 len += alg->cra_digest.dia_digestsize; 94 } 95 96 return len; 97 } 98 99 static inline unsigned int crypto_cipher_ctxsize(struct crypto_alg *alg, 100 int flags) 101 { 102 unsigned int len = alg->cra_ctxsize; 103 104 switch (flags & CRYPTO_TFM_MODE_MASK) { 105 case CRYPTO_TFM_MODE_CBC: 106 len = ALIGN(len, (unsigned long)alg->cra_alignmask + 1); 107 len += alg->cra_blocksize; 108 break; 109 } 110 111 return len; 112 } 113 114 static inline unsigned int crypto_compress_ctxsize(struct crypto_alg *alg, 115 int flags) 116 { 117 return alg->cra_ctxsize; 118 } 119 120 struct crypto_alg *crypto_mod_get(struct crypto_alg *alg); 121 struct crypto_alg *__crypto_alg_lookup(const char *name, u32 type, u32 mask); 122 struct crypto_alg *crypto_alg_mod_lookup(const char *name, u32 type, u32 mask); 123 124 int crypto_init_digest_flags(struct crypto_tfm *tfm, u32 flags); 125 int crypto_init_cipher_flags(struct crypto_tfm *tfm, u32 flags); 126 int crypto_init_compress_flags(struct crypto_tfm *tfm, u32 flags); 127 128 int crypto_init_digest_ops(struct crypto_tfm *tfm); 129 int crypto_init_cipher_ops(struct crypto_tfm *tfm); 130 int crypto_init_compress_ops(struct crypto_tfm *tfm); 131 132 void crypto_exit_digest_ops(struct crypto_tfm *tfm); 133 void crypto_exit_cipher_ops(struct crypto_tfm *tfm); 134 void crypto_exit_compress_ops(struct crypto_tfm *tfm); 135 136 void crypto_larval_error(const char *name, u32 type, u32 mask); 137 138 void crypto_shoot_alg(struct crypto_alg *alg); 139 struct crypto_tfm *__crypto_alloc_tfm(struct crypto_alg *alg, u32 flags); 140 141 int crypto_register_instance(struct crypto_template *tmpl, 142 struct crypto_instance *inst); 143 144 int crypto_register_notifier(struct notifier_block *nb); 145 int crypto_unregister_notifier(struct notifier_block *nb); 146 147 static inline void crypto_alg_put(struct crypto_alg *alg) 148 { 149 if (atomic_dec_and_test(&alg->cra_refcnt) && alg->cra_destroy) 150 alg->cra_destroy(alg); 151 } 152 153 static inline int crypto_tmpl_get(struct crypto_template *tmpl) 154 { 155 return try_module_get(tmpl->module); 156 } 157 158 static inline void crypto_tmpl_put(struct crypto_template *tmpl) 159 { 160 module_put(tmpl->module); 161 } 162 163 static inline int crypto_is_larval(struct crypto_alg *alg) 164 { 165 return alg->cra_flags & CRYPTO_ALG_LARVAL; 166 } 167 168 static inline int crypto_is_dead(struct crypto_alg *alg) 169 { 170 return alg->cra_flags & CRYPTO_ALG_DEAD; 171 } 172 173 static inline int crypto_is_moribund(struct crypto_alg *alg) 174 { 175 return alg->cra_flags & (CRYPTO_ALG_DEAD | CRYPTO_ALG_DYING); 176 } 177 178 static inline int crypto_notify(unsigned long val, void *v) 179 { 180 return blocking_notifier_call_chain(&crypto_chain, val, v); 181 } 182 183 #endif /* _CRYPTO_INTERNAL_H */ 184 185