/* * Cryptographic Hash operations. * * 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/hash.h> #include <linux/errno.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/slab.h> #include <linux/seq_file.h> #include "internal.h" static unsigned int crypto_hash_ctxsize(struct crypto_alg *alg, u32 type, u32 mask) { return alg->cra_ctxsize; } static int hash_setkey_unaligned(struct crypto_hash *crt, const u8 *key, unsigned int keylen) { struct crypto_tfm *tfm = crypto_hash_tfm(crt); struct hash_alg *alg = &tfm->__crt_alg->cra_hash; unsigned long alignmask = crypto_hash_alignmask(crt); 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 = alg->setkey(crt, alignbuffer, keylen); memset(alignbuffer, 0, keylen); kfree(buffer); return ret; } static int hash_setkey(struct crypto_hash *crt, const u8 *key, unsigned int keylen) { struct crypto_tfm *tfm = crypto_hash_tfm(crt); struct hash_alg *alg = &tfm->__crt_alg->cra_hash; unsigned long alignmask = crypto_hash_alignmask(crt); if ((unsigned long)key & alignmask) return hash_setkey_unaligned(crt, key, keylen); return alg->setkey(crt, key, keylen); } static int hash_async_setkey(struct crypto_ahash *tfm_async, const u8 *key, unsigned int keylen) { struct crypto_tfm *tfm = crypto_ahash_tfm(tfm_async); struct crypto_hash *tfm_hash = __crypto_hash_cast(tfm); struct hash_alg *alg = &tfm->__crt_alg->cra_hash; return alg->setkey(tfm_hash, key, keylen); } static int hash_async_init(struct ahash_request *req) { struct crypto_tfm *tfm = req->base.tfm; struct hash_alg *alg = &tfm->__crt_alg->cra_hash; struct hash_desc desc = { .tfm = __crypto_hash_cast(tfm), .flags = req->base.flags, }; return alg->init(&desc); } static int hash_async_update(struct ahash_request *req) { struct crypto_tfm *tfm = req->base.tfm; struct hash_alg *alg = &tfm->__crt_alg->cra_hash; struct hash_desc desc = { .tfm = __crypto_hash_cast(tfm), .flags = req->base.flags, }; return alg->update(&desc, req->src, req->nbytes); } static int hash_async_final(struct ahash_request *req) { struct crypto_tfm *tfm = req->base.tfm; struct hash_alg *alg = &tfm->__crt_alg->cra_hash; struct hash_desc desc = { .tfm = __crypto_hash_cast(tfm), .flags = req->base.flags, }; return alg->final(&desc, req->result); } static int hash_async_digest(struct ahash_request *req) { struct crypto_tfm *tfm = req->base.tfm; struct hash_alg *alg = &tfm->__crt_alg->cra_hash; struct hash_desc desc = { .tfm = __crypto_hash_cast(tfm), .flags = req->base.flags, }; return alg->digest(&desc, req->src, req->nbytes, req->result); } static int crypto_init_hash_ops_async(struct crypto_tfm *tfm) { struct ahash_tfm *crt = &tfm->crt_ahash; struct hash_alg *alg = &tfm->__crt_alg->cra_hash; crt->init = hash_async_init; crt->update = hash_async_update; crt->final = hash_async_final; crt->digest = hash_async_digest; crt->setkey = hash_async_setkey; crt->digestsize = alg->digestsize; return 0; } static int crypto_init_hash_ops_sync(struct crypto_tfm *tfm) { struct hash_tfm *crt = &tfm->crt_hash; struct hash_alg *alg = &tfm->__crt_alg->cra_hash; crt->init = alg->init; crt->update = alg->update; crt->final = alg->final; crt->digest = alg->digest; crt->setkey = hash_setkey; crt->digestsize = alg->digestsize; return 0; } static int crypto_init_hash_ops(struct crypto_tfm *tfm, u32 type, u32 mask) { struct hash_alg *alg = &tfm->__crt_alg->cra_hash; if (alg->digestsize > PAGE_SIZE / 8) return -EINVAL; if ((mask & CRYPTO_ALG_TYPE_HASH_MASK) != CRYPTO_ALG_TYPE_HASH_MASK) return crypto_init_hash_ops_async(tfm); else return crypto_init_hash_ops_sync(tfm); } static void crypto_hash_show(struct seq_file *m, struct crypto_alg *alg) __attribute__ ((unused)); static void crypto_hash_show(struct seq_file *m, struct crypto_alg *alg) { seq_printf(m, "type : hash\n"); seq_printf(m, "blocksize : %u\n", alg->cra_blocksize); seq_printf(m, "digestsize : %u\n", alg->cra_hash.digestsize); } const struct crypto_type crypto_hash_type = { .ctxsize = crypto_hash_ctxsize, .init = crypto_init_hash_ops, #ifdef CONFIG_PROC_FS .show = crypto_hash_show, #endif }; EXPORT_SYMBOL_GPL(crypto_hash_type); MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("Generic cryptographic hash type");