From 004a403c2e954734090a69aedc7f4f822bdcc142 Mon Sep 17 00:00:00 2001 From: Loc Ho Date: Wed, 14 May 2008 20:41:47 +0800 Subject: [CRYPTO] hash: Add asynchronous hash support This patch adds asynchronous hash and digest support. Signed-off-by: Loc Ho Signed-off-by: Herbert Xu --- crypto/ahash.c | 106 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 106 insertions(+) create mode 100644 crypto/ahash.c (limited to 'crypto/ahash.c') diff --git a/crypto/ahash.c b/crypto/ahash.c new file mode 100644 index 0000000..a83e035 --- /dev/null +++ b/crypto/ahash.c @@ -0,0 +1,106 @@ +/* + * Asynchronous Cryptographic Hash operations. + * + * This is the asynchronous version of hash.c with notification of + * completion via a callback. + * + * Copyright (c) 2008 Loc Ho + * + * 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 +#include +#include +#include +#include +#include +#include + +#include "internal.h" + +static int ahash_setkey_unaligned(struct crypto_ahash *tfm, const u8 *key, + unsigned int keylen) +{ + struct ahash_alg *ahash = crypto_ahash_alg(tfm); + unsigned long alignmask = crypto_ahash_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 = ahash->setkey(tfm, alignbuffer, keylen); + memset(alignbuffer, 0, keylen); + kfree(buffer); + return ret; +} + +static int ahash_setkey(struct crypto_ahash *tfm, const u8 *key, + unsigned int keylen) +{ + struct ahash_alg *ahash = crypto_ahash_alg(tfm); + unsigned long alignmask = crypto_ahash_alignmask(tfm); + + if ((unsigned long)key & alignmask) + return ahash_setkey_unaligned(tfm, key, keylen); + + return ahash->setkey(tfm, key, keylen); +} + +static unsigned int crypto_ahash_ctxsize(struct crypto_alg *alg, u32 type, + u32 mask) +{ + return alg->cra_ctxsize; +} + +static int crypto_init_ahash_ops(struct crypto_tfm *tfm, u32 type, u32 mask) +{ + struct ahash_alg *alg = &tfm->__crt_alg->cra_ahash; + struct ahash_tfm *crt = &tfm->crt_ahash; + + if (alg->digestsize > crypto_tfm_alg_blocksize(tfm)) + return -EINVAL; + + crt->init = alg->init; + crt->update = alg->update; + crt->final = alg->final; + crt->digest = alg->digest; + crt->setkey = ahash_setkey; + crt->base = __crypto_ahash_cast(tfm); + crt->digestsize = alg->digestsize; + + return 0; +} + +static void crypto_ahash_show(struct seq_file *m, struct crypto_alg *alg) + __attribute__ ((unused)); +static void crypto_ahash_show(struct seq_file *m, struct crypto_alg *alg) +{ + seq_printf(m, "type : ahash\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, "digestsize : %u\n", alg->cra_hash.digestsize); +} + +const struct crypto_type crypto_ahash_type = { + .ctxsize = crypto_ahash_ctxsize, + .init = crypto_init_ahash_ops, +#ifdef CONFIG_PROC_FS + .show = crypto_ahash_show, +#endif +}; +EXPORT_SYMBOL_GPL(crypto_ahash_type); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("Asynchronous cryptographic hash type"); -- cgit v1.1