589 lines
15 KiB
C
589 lines
15 KiB
C
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/*
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* Synchronous Cryptographic Hash operations.
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*
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* Copyright (c) 2008 Herbert Xu <herbert@gondor.apana.org.au>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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*/
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#include <crypto/scatterwalk.h>
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#include <crypto/internal/hash.h>
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#include <linux/err.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/seq_file.h>
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#include <linux/cryptouser.h>
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#include <net/netlink.h>
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#include <linux/compiler.h>
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#include "internal.h"
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static const struct crypto_type crypto_shash_type;
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int shash_no_setkey(struct crypto_shash *tfm, const u8 *key,
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unsigned int keylen)
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{
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return -ENOSYS;
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}
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EXPORT_SYMBOL_GPL(shash_no_setkey);
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static int shash_setkey_unaligned(struct crypto_shash *tfm, const u8 *key,
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unsigned int keylen)
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{
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struct shash_alg *shash = crypto_shash_alg(tfm);
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unsigned long alignmask = crypto_shash_alignmask(tfm);
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unsigned long absize;
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u8 *buffer, *alignbuffer;
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int err;
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absize = keylen + (alignmask & ~(crypto_tfm_ctx_alignment() - 1));
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buffer = kmalloc(absize, GFP_ATOMIC);
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if (!buffer)
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return -ENOMEM;
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alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);
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memcpy(alignbuffer, key, keylen);
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err = shash->setkey(tfm, alignbuffer, keylen);
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kzfree(buffer);
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return err;
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}
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static void shash_set_needkey(struct crypto_shash *tfm, struct shash_alg *alg)
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{
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if (crypto_shash_alg_has_setkey(alg) &&
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!(alg->base.cra_flags & CRYPTO_ALG_OPTIONAL_KEY))
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crypto_shash_set_flags(tfm, CRYPTO_TFM_NEED_KEY);
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}
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int crypto_shash_setkey(struct crypto_shash *tfm, const u8 *key,
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unsigned int keylen)
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{
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struct shash_alg *shash = crypto_shash_alg(tfm);
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unsigned long alignmask = crypto_shash_alignmask(tfm);
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int err;
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if ((unsigned long)key & alignmask)
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err = shash_setkey_unaligned(tfm, key, keylen);
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else
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err = shash->setkey(tfm, key, keylen);
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if (unlikely(err)) {
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shash_set_needkey(tfm, shash);
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return err;
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}
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crypto_shash_clear_flags(tfm, CRYPTO_TFM_NEED_KEY);
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return 0;
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}
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EXPORT_SYMBOL_GPL(crypto_shash_setkey);
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static inline unsigned int shash_align_buffer_size(unsigned len,
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unsigned long mask)
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{
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typedef u8 __aligned_largest u8_aligned;
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return len + (mask & ~(__alignof__(u8_aligned) - 1));
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}
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static int shash_update_unaligned(struct shash_desc *desc, const u8 *data,
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unsigned int len)
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{
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struct crypto_shash *tfm = desc->tfm;
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struct shash_alg *shash = crypto_shash_alg(tfm);
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unsigned long alignmask = crypto_shash_alignmask(tfm);
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unsigned int unaligned_len = alignmask + 1 -
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((unsigned long)data & alignmask);
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u8 ubuf[shash_align_buffer_size(unaligned_len, alignmask)]
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__aligned_largest;
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u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1);
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int err;
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if (unaligned_len > len)
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unaligned_len = len;
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memcpy(buf, data, unaligned_len);
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err = shash->update(desc, buf, unaligned_len);
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memset(buf, 0, unaligned_len);
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return err ?:
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shash->update(desc, data + unaligned_len, len - unaligned_len);
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}
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int crypto_shash_update(struct shash_desc *desc, const u8 *data,
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unsigned int len)
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{
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struct crypto_shash *tfm = desc->tfm;
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struct shash_alg *shash = crypto_shash_alg(tfm);
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unsigned long alignmask = crypto_shash_alignmask(tfm);
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if ((unsigned long)data & alignmask)
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return shash_update_unaligned(desc, data, len);
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return shash->update(desc, data, len);
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}
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EXPORT_SYMBOL_GPL(crypto_shash_update);
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static int shash_final_unaligned(struct shash_desc *desc, u8 *out)
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{
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struct crypto_shash *tfm = desc->tfm;
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unsigned long alignmask = crypto_shash_alignmask(tfm);
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struct shash_alg *shash = crypto_shash_alg(tfm);
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unsigned int ds = crypto_shash_digestsize(tfm);
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u8 ubuf[shash_align_buffer_size(ds, alignmask)]
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__aligned_largest;
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u8 *buf = PTR_ALIGN(&ubuf[0], alignmask + 1);
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int err;
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err = shash->final(desc, buf);
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if (err)
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goto out;
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memcpy(out, buf, ds);
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out:
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memset(buf, 0, ds);
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return err;
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}
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int crypto_shash_final(struct shash_desc *desc, u8 *out)
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{
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struct crypto_shash *tfm = desc->tfm;
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struct shash_alg *shash = crypto_shash_alg(tfm);
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unsigned long alignmask = crypto_shash_alignmask(tfm);
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if ((unsigned long)out & alignmask)
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return shash_final_unaligned(desc, out);
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return shash->final(desc, out);
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}
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EXPORT_SYMBOL_GPL(crypto_shash_final);
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static int shash_finup_unaligned(struct shash_desc *desc, const u8 *data,
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unsigned int len, u8 *out)
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{
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return crypto_shash_update(desc, data, len) ?:
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crypto_shash_final(desc, out);
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}
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int crypto_shash_finup(struct shash_desc *desc, const u8 *data,
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unsigned int len, u8 *out)
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{
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struct crypto_shash *tfm = desc->tfm;
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struct shash_alg *shash = crypto_shash_alg(tfm);
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unsigned long alignmask = crypto_shash_alignmask(tfm);
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if (((unsigned long)data | (unsigned long)out) & alignmask)
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return shash_finup_unaligned(desc, data, len, out);
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return shash->finup(desc, data, len, out);
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}
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EXPORT_SYMBOL_GPL(crypto_shash_finup);
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static int shash_digest_unaligned(struct shash_desc *desc, const u8 *data,
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unsigned int len, u8 *out)
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{
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return crypto_shash_init(desc) ?:
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crypto_shash_finup(desc, data, len, out);
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}
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int crypto_shash_digest(struct shash_desc *desc, const u8 *data,
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unsigned int len, u8 *out)
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{
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struct crypto_shash *tfm = desc->tfm;
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struct shash_alg *shash = crypto_shash_alg(tfm);
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unsigned long alignmask = crypto_shash_alignmask(tfm);
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if (crypto_shash_get_flags(tfm) & CRYPTO_TFM_NEED_KEY)
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return -ENOKEY;
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if (((unsigned long)data | (unsigned long)out) & alignmask)
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return shash_digest_unaligned(desc, data, len, out);
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return shash->digest(desc, data, len, out);
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}
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EXPORT_SYMBOL_GPL(crypto_shash_digest);
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static int shash_default_export(struct shash_desc *desc, void *out)
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{
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memcpy(out, shash_desc_ctx(desc), crypto_shash_descsize(desc->tfm));
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return 0;
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}
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static int shash_default_import(struct shash_desc *desc, const void *in)
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{
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memcpy(shash_desc_ctx(desc), in, crypto_shash_descsize(desc->tfm));
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return 0;
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}
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static int shash_async_setkey(struct crypto_ahash *tfm, const u8 *key,
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unsigned int keylen)
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{
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struct crypto_shash **ctx = crypto_ahash_ctx(tfm);
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return crypto_shash_setkey(*ctx, key, keylen);
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}
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static int shash_async_init(struct ahash_request *req)
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{
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struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
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struct shash_desc *desc = ahash_request_ctx(req);
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desc->tfm = *ctx;
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desc->flags = req->base.flags;
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return crypto_shash_init(desc);
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}
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int shash_ahash_update(struct ahash_request *req, struct shash_desc *desc)
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{
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struct crypto_hash_walk walk;
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int nbytes;
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for (nbytes = crypto_hash_walk_first(req, &walk); nbytes > 0;
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nbytes = crypto_hash_walk_done(&walk, nbytes))
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nbytes = crypto_shash_update(desc, walk.data, nbytes);
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return nbytes;
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}
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EXPORT_SYMBOL_GPL(shash_ahash_update);
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static int shash_async_update(struct ahash_request *req)
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{
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return shash_ahash_update(req, ahash_request_ctx(req));
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}
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static int shash_async_final(struct ahash_request *req)
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{
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return crypto_shash_final(ahash_request_ctx(req), req->result);
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}
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int shash_ahash_finup(struct ahash_request *req, struct shash_desc *desc)
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{
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struct crypto_hash_walk walk;
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int nbytes;
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nbytes = crypto_hash_walk_first(req, &walk);
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if (!nbytes)
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return crypto_shash_final(desc, req->result);
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do {
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nbytes = crypto_hash_walk_last(&walk) ?
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crypto_shash_finup(desc, walk.data, nbytes,
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req->result) :
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crypto_shash_update(desc, walk.data, nbytes);
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nbytes = crypto_hash_walk_done(&walk, nbytes);
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} while (nbytes > 0);
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return nbytes;
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}
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EXPORT_SYMBOL_GPL(shash_ahash_finup);
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static int shash_async_finup(struct ahash_request *req)
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{
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struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
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struct shash_desc *desc = ahash_request_ctx(req);
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desc->tfm = *ctx;
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desc->flags = req->base.flags;
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return shash_ahash_finup(req, desc);
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}
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int shash_ahash_digest(struct ahash_request *req, struct shash_desc *desc)
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{
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unsigned int nbytes = req->nbytes;
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struct scatterlist *sg;
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unsigned int offset;
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int err;
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if (nbytes &&
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(sg = req->src, offset = sg->offset,
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nbytes < min(sg->length, ((unsigned int)(PAGE_SIZE)) - offset))) {
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void *data;
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data = kmap_atomic(sg_page(sg));
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err = crypto_shash_digest(desc, data + offset, nbytes,
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req->result);
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kunmap_atomic(data);
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crypto_yield(desc->flags);
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} else
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err = crypto_shash_init(desc) ?:
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shash_ahash_finup(req, desc);
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return err;
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}
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EXPORT_SYMBOL_GPL(shash_ahash_digest);
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static int shash_async_digest(struct ahash_request *req)
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{
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struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
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struct shash_desc *desc = ahash_request_ctx(req);
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desc->tfm = *ctx;
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desc->flags = req->base.flags;
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return shash_ahash_digest(req, desc);
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}
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static int shash_async_export(struct ahash_request *req, void *out)
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{
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return crypto_shash_export(ahash_request_ctx(req), out);
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}
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static int shash_async_import(struct ahash_request *req, const void *in)
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{
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struct crypto_shash **ctx = crypto_ahash_ctx(crypto_ahash_reqtfm(req));
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struct shash_desc *desc = ahash_request_ctx(req);
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desc->tfm = *ctx;
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desc->flags = req->base.flags;
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return crypto_shash_import(desc, in);
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}
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static void crypto_exit_shash_ops_async(struct crypto_tfm *tfm)
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{
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struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
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crypto_free_shash(*ctx);
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}
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int crypto_init_shash_ops_async(struct crypto_tfm *tfm)
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{
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struct crypto_alg *calg = tfm->__crt_alg;
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struct shash_alg *alg = __crypto_shash_alg(calg);
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struct crypto_ahash *crt = __crypto_ahash_cast(tfm);
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struct crypto_shash **ctx = crypto_tfm_ctx(tfm);
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struct crypto_shash *shash;
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if (!crypto_mod_get(calg))
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return -EAGAIN;
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|
|
||
|
|
shash = crypto_create_tfm(calg, &crypto_shash_type);
|
||
|
|
if (IS_ERR(shash)) {
|
||
|
|
crypto_mod_put(calg);
|
||
|
|
return PTR_ERR(shash);
|
||
|
|
}
|
||
|
|
|
||
|
|
*ctx = shash;
|
||
|
|
tfm->exit = crypto_exit_shash_ops_async;
|
||
|
|
|
||
|
|
crt->init = shash_async_init;
|
||
|
|
crt->update = shash_async_update;
|
||
|
|
crt->final = shash_async_final;
|
||
|
|
crt->finup = shash_async_finup;
|
||
|
|
crt->digest = shash_async_digest;
|
||
|
|
if (crypto_shash_alg_has_setkey(alg))
|
||
|
|
crt->setkey = shash_async_setkey;
|
||
|
|
|
||
|
|
crypto_ahash_set_flags(crt, crypto_shash_get_flags(shash) &
|
||
|
|
CRYPTO_TFM_NEED_KEY);
|
||
|
|
|
||
|
|
if (alg->export)
|
||
|
|
crt->export = shash_async_export;
|
||
|
|
if (alg->import)
|
||
|
|
crt->import = shash_async_import;
|
||
|
|
|
||
|
|
crt->reqsize = sizeof(struct shash_desc) + crypto_shash_descsize(shash);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int crypto_shash_init_tfm(struct crypto_tfm *tfm)
|
||
|
|
{
|
||
|
|
struct crypto_shash *hash = __crypto_shash_cast(tfm);
|
||
|
|
struct shash_alg *alg = crypto_shash_alg(hash);
|
||
|
|
|
||
|
|
hash->descsize = alg->descsize;
|
||
|
|
|
||
|
|
shash_set_needkey(hash, alg);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
#ifdef CONFIG_NET
|
||
|
|
static int crypto_shash_report(struct sk_buff *skb, struct crypto_alg *alg)
|
||
|
|
{
|
||
|
|
struct crypto_report_hash rhash;
|
||
|
|
struct shash_alg *salg = __crypto_shash_alg(alg);
|
||
|
|
|
||
|
|
strncpy(rhash.type, "shash", sizeof(rhash.type));
|
||
|
|
|
||
|
|
rhash.blocksize = alg->cra_blocksize;
|
||
|
|
rhash.digestsize = salg->digestsize;
|
||
|
|
|
||
|
|
if (nla_put(skb, CRYPTOCFGA_REPORT_HASH,
|
||
|
|
sizeof(struct crypto_report_hash), &rhash))
|
||
|
|
goto nla_put_failure;
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
nla_put_failure:
|
||
|
|
return -EMSGSIZE;
|
||
|
|
}
|
||
|
|
#else
|
||
|
|
static int crypto_shash_report(struct sk_buff *skb, struct crypto_alg *alg)
|
||
|
|
{
|
||
|
|
return -ENOSYS;
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
|
||
|
|
static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
|
||
|
|
__maybe_unused;
|
||
|
|
static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
|
||
|
|
{
|
||
|
|
struct shash_alg *salg = __crypto_shash_alg(alg);
|
||
|
|
|
||
|
|
seq_printf(m, "type : shash\n");
|
||
|
|
seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
|
||
|
|
seq_printf(m, "digestsize : %u\n", salg->digestsize);
|
||
|
|
}
|
||
|
|
|
||
|
|
static const struct crypto_type crypto_shash_type = {
|
||
|
|
.extsize = crypto_alg_extsize,
|
||
|
|
.init_tfm = crypto_shash_init_tfm,
|
||
|
|
#ifdef CONFIG_PROC_FS
|
||
|
|
.show = crypto_shash_show,
|
||
|
|
#endif
|
||
|
|
.report = crypto_shash_report,
|
||
|
|
.maskclear = ~CRYPTO_ALG_TYPE_MASK,
|
||
|
|
.maskset = CRYPTO_ALG_TYPE_MASK,
|
||
|
|
.type = CRYPTO_ALG_TYPE_SHASH,
|
||
|
|
.tfmsize = offsetof(struct crypto_shash, base),
|
||
|
|
};
|
||
|
|
|
||
|
|
struct crypto_shash *crypto_alloc_shash(const char *alg_name, u32 type,
|
||
|
|
u32 mask)
|
||
|
|
{
|
||
|
|
return crypto_alloc_tfm(alg_name, &crypto_shash_type, type, mask);
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL_GPL(crypto_alloc_shash);
|
||
|
|
|
||
|
|
static int shash_prepare_alg(struct shash_alg *alg)
|
||
|
|
{
|
||
|
|
struct crypto_alg *base = &alg->base;
|
||
|
|
|
||
|
|
if (alg->digestsize > PAGE_SIZE / 8 ||
|
||
|
|
alg->descsize > PAGE_SIZE / 8 ||
|
||
|
|
alg->statesize > PAGE_SIZE / 8)
|
||
|
|
return -EINVAL;
|
||
|
|
|
||
|
|
base->cra_type = &crypto_shash_type;
|
||
|
|
base->cra_flags &= ~CRYPTO_ALG_TYPE_MASK;
|
||
|
|
base->cra_flags |= CRYPTO_ALG_TYPE_SHASH;
|
||
|
|
|
||
|
|
if (!alg->finup)
|
||
|
|
alg->finup = shash_finup_unaligned;
|
||
|
|
if (!alg->digest)
|
||
|
|
alg->digest = shash_digest_unaligned;
|
||
|
|
if (!alg->export) {
|
||
|
|
alg->export = shash_default_export;
|
||
|
|
alg->import = shash_default_import;
|
||
|
|
alg->statesize = alg->descsize;
|
||
|
|
}
|
||
|
|
if (!alg->setkey)
|
||
|
|
alg->setkey = shash_no_setkey;
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
int crypto_register_shash(struct shash_alg *alg)
|
||
|
|
{
|
||
|
|
struct crypto_alg *base = &alg->base;
|
||
|
|
int err;
|
||
|
|
|
||
|
|
err = shash_prepare_alg(alg);
|
||
|
|
if (err)
|
||
|
|
return err;
|
||
|
|
|
||
|
|
return crypto_register_alg(base);
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL_GPL(crypto_register_shash);
|
||
|
|
|
||
|
|
int crypto_unregister_shash(struct shash_alg *alg)
|
||
|
|
{
|
||
|
|
return crypto_unregister_alg(&alg->base);
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL_GPL(crypto_unregister_shash);
|
||
|
|
|
||
|
|
int crypto_register_shashes(struct shash_alg *algs, int count)
|
||
|
|
{
|
||
|
|
int i, ret;
|
||
|
|
|
||
|
|
for (i = 0; i < count; i++) {
|
||
|
|
ret = crypto_register_shash(&algs[i]);
|
||
|
|
if (ret)
|
||
|
|
goto err;
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
err:
|
||
|
|
for (--i; i >= 0; --i)
|
||
|
|
crypto_unregister_shash(&algs[i]);
|
||
|
|
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL_GPL(crypto_register_shashes);
|
||
|
|
|
||
|
|
int crypto_unregister_shashes(struct shash_alg *algs, int count)
|
||
|
|
{
|
||
|
|
int i, ret;
|
||
|
|
|
||
|
|
for (i = count - 1; i >= 0; --i) {
|
||
|
|
ret = crypto_unregister_shash(&algs[i]);
|
||
|
|
if (ret)
|
||
|
|
pr_err("Failed to unregister %s %s: %d\n",
|
||
|
|
algs[i].base.cra_driver_name,
|
||
|
|
algs[i].base.cra_name, ret);
|
||
|
|
}
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL_GPL(crypto_unregister_shashes);
|
||
|
|
|
||
|
|
int shash_register_instance(struct crypto_template *tmpl,
|
||
|
|
struct shash_instance *inst)
|
||
|
|
{
|
||
|
|
int err;
|
||
|
|
|
||
|
|
err = shash_prepare_alg(&inst->alg);
|
||
|
|
if (err)
|
||
|
|
return err;
|
||
|
|
|
||
|
|
return crypto_register_instance(tmpl, shash_crypto_instance(inst));
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL_GPL(shash_register_instance);
|
||
|
|
|
||
|
|
void shash_free_instance(struct crypto_instance *inst)
|
||
|
|
{
|
||
|
|
crypto_drop_spawn(crypto_instance_ctx(inst));
|
||
|
|
kfree(shash_instance(inst));
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL_GPL(shash_free_instance);
|
||
|
|
|
||
|
|
int crypto_init_shash_spawn(struct crypto_shash_spawn *spawn,
|
||
|
|
struct shash_alg *alg,
|
||
|
|
struct crypto_instance *inst)
|
||
|
|
{
|
||
|
|
return crypto_init_spawn2(&spawn->base, &alg->base, inst,
|
||
|
|
&crypto_shash_type);
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL_GPL(crypto_init_shash_spawn);
|
||
|
|
|
||
|
|
struct shash_alg *shash_attr_alg(struct rtattr *rta, u32 type, u32 mask)
|
||
|
|
{
|
||
|
|
struct crypto_alg *alg;
|
||
|
|
|
||
|
|
alg = crypto_attr_alg2(rta, &crypto_shash_type, type, mask);
|
||
|
|
return IS_ERR(alg) ? ERR_CAST(alg) :
|
||
|
|
container_of(alg, struct shash_alg, base);
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL_GPL(shash_attr_alg);
|
||
|
|
|
||
|
|
MODULE_LICENSE("GPL");
|
||
|
|
MODULE_DESCRIPTION("Synchronous cryptographic hash type");
|