1 /* 2 * Symmetric key ciphers. 3 * 4 * Copyright (c) 2007 Herbert Xu <herbert@gondor.apana.org.au> 5 * 6 * This program is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License as published by the Free 8 * Software Foundation; either version 2 of the License, or (at your option) 9 * any later version. 10 * 11 */ 12 13 #ifndef _CRYPTO_SKCIPHER_H 14 #define _CRYPTO_SKCIPHER_H 15 16 #include <linux/crypto.h> 17 #include <linux/kernel.h> 18 #include <linux/slab.h> 19 20 /** 21 * struct skcipher_givcrypt_request - Crypto request with IV generation 22 * @seq: Sequence number for IV generation 23 * @giv: Space for generated IV 24 * @creq: The crypto request itself 25 */ 26 struct skcipher_givcrypt_request { 27 u64 seq; 28 u8 *giv; 29 30 struct ablkcipher_request creq; 31 }; 32 33 static inline struct crypto_ablkcipher *skcipher_givcrypt_reqtfm( 34 struct skcipher_givcrypt_request *req) 35 { 36 return crypto_ablkcipher_reqtfm(&req->creq); 37 } 38 39 static inline int crypto_skcipher_givencrypt( 40 struct skcipher_givcrypt_request *req) 41 { 42 struct ablkcipher_tfm *crt = 43 crypto_ablkcipher_crt(skcipher_givcrypt_reqtfm(req)); 44 return crt->givencrypt(req); 45 }; 46 47 static inline int crypto_skcipher_givdecrypt( 48 struct skcipher_givcrypt_request *req) 49 { 50 struct ablkcipher_tfm *crt = 51 crypto_ablkcipher_crt(skcipher_givcrypt_reqtfm(req)); 52 return crt->givdecrypt(req); 53 }; 54 55 static inline void skcipher_givcrypt_set_tfm( 56 struct skcipher_givcrypt_request *req, struct crypto_ablkcipher *tfm) 57 { 58 req->creq.base.tfm = crypto_ablkcipher_tfm(tfm); 59 } 60 61 static inline struct skcipher_givcrypt_request *skcipher_givcrypt_cast( 62 struct crypto_async_request *req) 63 { 64 return container_of(ablkcipher_request_cast(req), 65 struct skcipher_givcrypt_request, creq); 66 } 67 68 static inline struct skcipher_givcrypt_request *skcipher_givcrypt_alloc( 69 struct crypto_ablkcipher *tfm, gfp_t gfp) 70 { 71 struct skcipher_givcrypt_request *req; 72 73 req = kmalloc(sizeof(struct skcipher_givcrypt_request) + 74 crypto_ablkcipher_reqsize(tfm), gfp); 75 76 if (likely(req)) 77 skcipher_givcrypt_set_tfm(req, tfm); 78 79 return req; 80 } 81 82 static inline void skcipher_givcrypt_free(struct skcipher_givcrypt_request *req) 83 { 84 kfree(req); 85 } 86 87 static inline void skcipher_givcrypt_set_callback( 88 struct skcipher_givcrypt_request *req, u32 flags, 89 crypto_completion_t compl, void *data) 90 { 91 ablkcipher_request_set_callback(&req->creq, flags, compl, data); 92 } 93 94 static inline void skcipher_givcrypt_set_crypt( 95 struct skcipher_givcrypt_request *req, 96 struct scatterlist *src, struct scatterlist *dst, 97 unsigned int nbytes, void *iv) 98 { 99 ablkcipher_request_set_crypt(&req->creq, src, dst, nbytes, iv); 100 } 101 102 static inline void skcipher_givcrypt_set_giv( 103 struct skcipher_givcrypt_request *req, u8 *giv, u64 seq) 104 { 105 req->giv = giv; 106 req->seq = seq; 107 } 108 109 #endif /* _CRYPTO_SKCIPHER_H */ 110 111