1/* 2 * Cryptographic API. 3 * 4 * Partial (de)compression operations. 5 * 6 * Copyright 2008 Sony Corporation 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; version 2 of the License. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License 18 * along with this program. 19 * If not, see <http://www.gnu.org/licenses/>. 20 */ 21 22#include <linux/crypto.h> 23#include <linux/errno.h> 24#include <linux/module.h> 25#include <linux/seq_file.h> 26#include <linux/string.h> 27#include <linux/cryptouser.h> 28#include <net/netlink.h> 29 30#include <crypto/compress.h> 31#include <crypto/internal/compress.h> 32 33#include "internal.h" 34 35 36static int crypto_pcomp_init(struct crypto_tfm *tfm, u32 type, u32 mask) 37{ 38 return 0; 39} 40 41static unsigned int crypto_pcomp_extsize(struct crypto_alg *alg) 42{ 43 return alg->cra_ctxsize; 44} 45 46static int crypto_pcomp_init_tfm(struct crypto_tfm *tfm) 47{ 48 return 0; 49} 50 51#ifdef CONFIG_NET 52static int crypto_pcomp_report(struct sk_buff *skb, struct crypto_alg *alg) 53{ 54 struct crypto_report_comp rpcomp; 55 56 strncpy(rpcomp.type, "pcomp", sizeof(rpcomp.type)); 57 if (nla_put(skb, CRYPTOCFGA_REPORT_COMPRESS, 58 sizeof(struct crypto_report_comp), &rpcomp)) 59 goto nla_put_failure; 60 return 0; 61 62nla_put_failure: 63 return -EMSGSIZE; 64} 65#else 66static int crypto_pcomp_report(struct sk_buff *skb, struct crypto_alg *alg) 67{ 68 return -ENOSYS; 69} 70#endif 71 72static void crypto_pcomp_show(struct seq_file *m, struct crypto_alg *alg) 73 __attribute__ ((unused)); 74static void crypto_pcomp_show(struct seq_file *m, struct crypto_alg *alg) 75{ 76 seq_printf(m, "type : pcomp\n"); 77} 78 79static const struct crypto_type crypto_pcomp_type = { 80 .extsize = crypto_pcomp_extsize, 81 .init = crypto_pcomp_init, 82 .init_tfm = crypto_pcomp_init_tfm, 83#ifdef CONFIG_PROC_FS 84 .show = crypto_pcomp_show, 85#endif 86 .report = crypto_pcomp_report, 87 .maskclear = ~CRYPTO_ALG_TYPE_MASK, 88 .maskset = CRYPTO_ALG_TYPE_MASK, 89 .type = CRYPTO_ALG_TYPE_PCOMPRESS, 90 .tfmsize = offsetof(struct crypto_pcomp, base), 91}; 92 93struct crypto_pcomp *crypto_alloc_pcomp(const char *alg_name, u32 type, 94 u32 mask) 95{ 96 return crypto_alloc_tfm(alg_name, &crypto_pcomp_type, type, mask); 97} 98EXPORT_SYMBOL_GPL(crypto_alloc_pcomp); 99 100int crypto_register_pcomp(struct pcomp_alg *alg) 101{ 102 struct crypto_alg *base = &alg->base; 103 104 base->cra_type = &crypto_pcomp_type; 105 base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK; 106 base->cra_flags |= CRYPTO_ALG_TYPE_PCOMPRESS; 107 108 return crypto_register_alg(base); 109} 110EXPORT_SYMBOL_GPL(crypto_register_pcomp); 111 112int crypto_unregister_pcomp(struct pcomp_alg *alg) 113{ 114 return crypto_unregister_alg(&alg->base); 115} 116EXPORT_SYMBOL_GPL(crypto_unregister_pcomp); 117 118MODULE_LICENSE("GPL"); 119MODULE_DESCRIPTION("Partial (de)compression type"); 120MODULE_AUTHOR("Sony Corporation"); 121