litmus-rt.git - The LITMUS^RT kernel.

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Diffstat (limited to 'lib/parser.c')

0 files changed, 0 insertions, 0 deletions

/* * Asynchronous block chaining cipher operations. * * This is the asynchronous version of blkcipher.c indicating completion * via a callback. * * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au> * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the Free * Software Foundation; either version 2 of the License, or (at your option) * any later version. * */ #include <crypto/internal/skcipher.h> #include <linux/err.h> #include <linux/init.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/rtnetlink.h> #include <linux/sched.h> #include <linux/slab.h> #include <linux/seq_file.h> #include "internal.h" static int setkey_unaligned(struct crypto_ablkcipher *tfm, const u8 *key, unsigned int keylen) { struct ablkcipher_alg *cipher = crypto_ablkcipher_alg(tfm); unsigned long alignmask = crypto_ablkcipher_alignmask(tfm); int ret; u8 *buffer, *alignbuffer; unsigned long absize; absize = keylen + alignmask; buffer = kmalloc(absize, GFP_ATOMIC); if (!buffer) return -ENOMEM; alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1); memcpy(alignbuffer, key, keylen); ret = cipher->setkey(tfm, alignbuffer, keylen); memset(alignbuffer, 0, keylen); kfree(buffer); return ret; } static int setkey(struct crypto_ablkcipher *tfm, const u8 *key, unsigned int keylen) { struct ablkcipher_alg *cipher = crypto_ablkcipher_alg(tfm); unsigned long alignmask = crypto_ablkcipher_alignmask(tfm); if (keylen < cipher->min_keysize || keylen > cipher->max_keysize) { crypto_ablkcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN); return -EINVAL; } if ((unsigned long)key & alignmask) return setkey_unaligned(tfm, key, keylen); return cipher->setkey(tfm, key, keylen); } static unsigned int crypto_ablkcipher_ctxsize(struct crypto_alg *alg, u32 type, u32 mask) { return alg->cra_ctxsize; } int skcipher_null_givencrypt(struct skcipher_givcrypt_request *req) { return crypto_ablkcipher_encrypt(&req->creq); } int skcipher_null_givdecrypt(struct skcipher_givcrypt_request *req) { return crypto_ablkcipher_decrypt(&req->creq); } static int crypto_init_ablkcipher_ops(struct crypto_tfm *tfm, u32 type, u32 mask) { struct ablkcipher_alg *alg = &tfm->__crt_alg->cra_ablkcipher; struct ablkcipher_tfm *crt = &tfm->crt_ablkcipher; if (alg->ivsize > PAGE_SIZE / 8) return -EINVAL; crt->setkey = setkey; crt->encrypt = alg->encrypt; crt->decrypt = alg->decrypt; if (!alg->ivsize) { crt->givencrypt = skcipher_null_givencrypt; crt->givdecrypt = skcipher_null_givdecrypt; } crt->base = __crypto_ablkcipher_cast(tfm); crt->ivsize = alg->ivsize; return 0; } static void crypto_ablkcipher_show(struct seq_file *m, struct crypto_alg *alg) __attribute__ ((unused)); static void crypto_ablkcipher_show(struct seq_file *m, struct crypto_alg *alg) { struct ablkcipher_alg *ablkcipher = &alg->cra_ablkcipher; seq_printf(m, "type : ablkcipher\n"); seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ? "yes" : "no"); seq_printf(m, "blocksize : %u\n", alg->cra_blocksize); seq_printf(m, "min keysize : %u\n", ablkcipher->min_keysize); seq_printf(m, "max keysize : %u\n", ablkcipher->max_keysize); seq_printf(m, "ivsize : %u\n", ablkcipher->ivsize); seq_printf(m, "geniv : %s\n", ablkcipher->geniv ?: "<default>"); } const struct crypto_type crypto_ablkcipher_type = { .ctxsize = crypto_ablkcipher_ctxsize, .init = crypto_init_ablkcipher_ops, #ifdef CONFIG_PROC_FS .show = crypto_ablkcipher_show, #endif }; EXPORT_SYMBOL_GPL(crypto_ablkcipher_type); static int no_givdecrypt(struct skcipher_givcrypt_request *req) { return -ENOSYS; } static int crypto_init_givcipher_ops(struct crypto_tfm *tfm, u32 type, u32 mask) { struct ablkcipher_alg *alg = &tfm->__crt_alg->cra_ablkcipher; struct ablkcipher_tfm *crt = &tfm->crt_ablkcipher; if (alg->ivsize > PAGE_SIZE / 8) return -EINVAL; crt->setkey = tfm->__crt_alg->cra_flags & CRYPTO_ALG_GENIV ? alg->setkey : setkey; crt->encrypt = alg->encrypt; crt->decrypt = alg->decrypt; crt->givencrypt = alg->givencrypt; crt->givdecrypt = alg->givdecrypt ?: no_givdecrypt; crt->base = __crypto_ablkcipher_cast(tfm); crt->ivsize = alg->ivsize; return 0; } static void crypto_givcipher_show(struct seq_file *m, struct crypto_alg *alg) __attribute__ ((unused)); static void crypto_givcipher_show(struct seq_file *m, struct crypto_alg *alg) { struct ablkcipher_alg *ablkcipher = &alg->cra_ablkcipher; seq_printf(m, "type : givcipher\n"); seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ? "yes" : "no"); seq_printf(m, "blocksize : %u\n", alg->cra_blocksize); seq_printf(m, "min keysize : %u\n", ablkcipher->min_keysize); seq_printf(m, "max keysize : %u\n", ablkcipher->max_keysize); seq_printf(m, "ivsize : %u\n", ablkcipher->ivsize); seq_printf(m, "geniv : %s\n", ablkcipher->geniv ?: "<built-in>"); } const struct crypto_type crypto_givcipher_type = { .ctxsize = crypto_ablkcipher_ctxsize, .init = crypto_init_givcipher_ops, #ifdef CONFIG_PROC_FS .show = crypto_givcipher_show, #endif }; EXPORT_SYMBOL_GPL(crypto_givcipher_type); const char *crypto_default_geniv(const struct crypto_alg *alg) { return alg->cra_flags & CRYPTO_ALG_ASYNC ? "eseqiv" : "chainiv"; } static int crypto_givcipher_default(struct crypto_alg *alg, u32 type, u32 mask) { struct rtattr *tb[3]; struct { struct rtattr attr; struct crypto_attr_type data; } ptype; struct { struct rtattr attr; struct crypto_attr_alg data; } palg; struct crypto_template *tmpl; struct crypto_instance *inst; struct crypto_alg *larval; const char *geniv; int err; larval = crypto_larval_lookup(alg->cra_driver_name, CRYPTO_ALG_TYPE_GIVCIPHER, CRYPTO_ALG_TYPE_MASK); err = PTR_ERR(larval); if (IS_ERR(larval)) goto out; err = -EAGAIN; if (!crypto_is_larval(larval)) goto drop_larval; ptype.attr.rta_len = sizeof(ptype); ptype.attr.rta_type = CRYPTOA_TYPE; ptype.data.type = type | CRYPTO_ALG_GENIV; /* GENIV tells the template that we're making a default geniv. */ ptype.data.mask = mask | CRYPTO_ALG_GENIV; tb[0] = &ptype.attr; palg.attr.rta_len = sizeof(palg); palg.attr.rta_type = CRYPTOA_ALG; /* Must use the exact name to locate ourselves. */ memcpy(palg.data.name, alg->cra_driver_name, CRYPTO_MAX_ALG_NAME); tb[1] = &palg.attr; tb[2] = NULL; if ((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) == CRYPTO_ALG_TYPE_BLKCIPHER) geniv = alg->cra_blkcipher.geniv; else geniv = alg->cra_ablkcipher.geniv; if (!geniv) geniv = crypto_default_geniv(alg); tmpl = crypto_lookup_template(geniv); err = -ENOENT; if (!tmpl) goto kill_larval; inst = tmpl->alloc(tb); err = PTR_ERR(inst); if (IS_ERR(inst)) goto put_tmpl; if ((err = crypto_register_instance(tmpl, inst))) { tmpl->free(inst); goto put_tmpl; } /* Redo the lookup to use the instance we just registered. */ err = -EAGAIN; put_tmpl: crypto_tmpl_put(tmpl); kill_larval: crypto_larval_kill(larval); drop_larval: crypto_mod_put(larval); out: crypto_mod_put(alg); return err; } static struct crypto_alg *crypto_lookup_skcipher(const char *name, u32 type, u32 mask) { struct crypto_alg *alg; alg = crypto_alg_mod_lookup(name, type, mask); if (IS_ERR(alg)) return alg; if ((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) == CRYPTO_ALG_TYPE_GIVCIPHER) return alg; if (!((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) == CRYPTO_ALG_TYPE_BLKCIPHER ? alg->cra_blkcipher.ivsize : alg->cra_ablkcipher.ivsize)) return alg; return ERR_PTR(crypto_givcipher_default(alg, type, mask)); } int crypto_grab_skcipher(struct crypto_skcipher_spawn *spawn, const char *name, u32 type, u32 mask) { struct crypto_alg *alg; int err; type = crypto_skcipher_type(type); mask = crypto_skcipher_mask(mask); alg = crypto_lookup_skcipher(name, type, mask); if (IS_ERR(alg)) return PTR_ERR(alg); err = crypto_init_spawn(&spawn->base, alg, spawn->base.inst, mask); crypto_mod_put(alg); return err; } EXPORT_SYMBOL_GPL(crypto_grab_skcipher); struct crypto_ablkcipher *crypto_alloc_ablkcipher(const char *alg_name, u32 type, u32 mask) { struct crypto_tfm *tfm; int err; type = crypto_skcipher_type(type); mask = crypto_skcipher_mask(mask); for (;;) { struct crypto_alg *alg; alg = crypto_lookup_skcipher(alg_name, type, mask); if (IS_ERR(alg)) { err = PTR_ERR(alg); goto err; } tfm = __crypto_alloc_tfm(alg, type, mask); if (!IS_ERR(tfm)) return __crypto_ablkcipher_cast(tfm); crypto_mod_put(alg); err = PTR_ERR(tfm); err: if (err != -EAGAIN) break; if (signal_pending(current)) { err = -EINTR; break; } } return ERR_PTR(err); } EXPORT_SYMBOL_GPL(crypto_alloc_ablkcipher); MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("Asynchronous block chaining cipher type");


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