mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
274 lines
6.7 KiB
274 lines
6.7 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
|
/* |
|
* Copyright (C)2006 USAGI/WIDE Project |
|
* |
|
* Author: |
|
* Kazunori Miyazawa <[email protected]> |
|
*/ |
|
|
|
#include <crypto/internal/hash.h> |
|
#include <linux/err.h> |
|
#include <linux/kernel.h> |
|
#include <linux/module.h> |
|
|
|
static u_int32_t ks[12] = {0x01010101, 0x01010101, 0x01010101, 0x01010101, |
|
0x02020202, 0x02020202, 0x02020202, 0x02020202, |
|
0x03030303, 0x03030303, 0x03030303, 0x03030303}; |
|
|
|
/* |
|
* +------------------------ |
|
* | <parent tfm> |
|
* +------------------------ |
|
* | xcbc_tfm_ctx |
|
* +------------------------ |
|
* | consts (block size * 2) |
|
* +------------------------ |
|
*/ |
|
struct xcbc_tfm_ctx { |
|
struct crypto_cipher *child; |
|
u8 ctx[]; |
|
}; |
|
|
|
/* |
|
* +------------------------ |
|
* | <shash desc> |
|
* +------------------------ |
|
* | xcbc_desc_ctx |
|
* +------------------------ |
|
* | odds (block size) |
|
* +------------------------ |
|
* | prev (block size) |
|
* +------------------------ |
|
*/ |
|
struct xcbc_desc_ctx { |
|
unsigned int len; |
|
u8 ctx[]; |
|
}; |
|
|
|
#define XCBC_BLOCKSIZE 16 |
|
|
|
static int crypto_xcbc_digest_setkey(struct crypto_shash *parent, |
|
const u8 *inkey, unsigned int keylen) |
|
{ |
|
unsigned long alignmask = crypto_shash_alignmask(parent); |
|
struct xcbc_tfm_ctx *ctx = crypto_shash_ctx(parent); |
|
u8 *consts = PTR_ALIGN(&ctx->ctx[0], alignmask + 1); |
|
int err = 0; |
|
u8 key1[XCBC_BLOCKSIZE]; |
|
int bs = sizeof(key1); |
|
|
|
if ((err = crypto_cipher_setkey(ctx->child, inkey, keylen))) |
|
return err; |
|
|
|
crypto_cipher_encrypt_one(ctx->child, consts, (u8 *)ks + bs); |
|
crypto_cipher_encrypt_one(ctx->child, consts + bs, (u8 *)ks + bs * 2); |
|
crypto_cipher_encrypt_one(ctx->child, key1, (u8 *)ks); |
|
|
|
return crypto_cipher_setkey(ctx->child, key1, bs); |
|
|
|
} |
|
|
|
static int crypto_xcbc_digest_init(struct shash_desc *pdesc) |
|
{ |
|
unsigned long alignmask = crypto_shash_alignmask(pdesc->tfm); |
|
struct xcbc_desc_ctx *ctx = shash_desc_ctx(pdesc); |
|
int bs = crypto_shash_blocksize(pdesc->tfm); |
|
u8 *prev = PTR_ALIGN(&ctx->ctx[0], alignmask + 1) + bs; |
|
|
|
ctx->len = 0; |
|
memset(prev, 0, bs); |
|
|
|
return 0; |
|
} |
|
|
|
static int crypto_xcbc_digest_update(struct shash_desc *pdesc, const u8 *p, |
|
unsigned int len) |
|
{ |
|
struct crypto_shash *parent = pdesc->tfm; |
|
unsigned long alignmask = crypto_shash_alignmask(parent); |
|
struct xcbc_tfm_ctx *tctx = crypto_shash_ctx(parent); |
|
struct xcbc_desc_ctx *ctx = shash_desc_ctx(pdesc); |
|
struct crypto_cipher *tfm = tctx->child; |
|
int bs = crypto_shash_blocksize(parent); |
|
u8 *odds = PTR_ALIGN(&ctx->ctx[0], alignmask + 1); |
|
u8 *prev = odds + bs; |
|
|
|
/* checking the data can fill the block */ |
|
if ((ctx->len + len) <= bs) { |
|
memcpy(odds + ctx->len, p, len); |
|
ctx->len += len; |
|
return 0; |
|
} |
|
|
|
/* filling odds with new data and encrypting it */ |
|
memcpy(odds + ctx->len, p, bs - ctx->len); |
|
len -= bs - ctx->len; |
|
p += bs - ctx->len; |
|
|
|
crypto_xor(prev, odds, bs); |
|
crypto_cipher_encrypt_one(tfm, prev, prev); |
|
|
|
/* clearing the length */ |
|
ctx->len = 0; |
|
|
|
/* encrypting the rest of data */ |
|
while (len > bs) { |
|
crypto_xor(prev, p, bs); |
|
crypto_cipher_encrypt_one(tfm, prev, prev); |
|
p += bs; |
|
len -= bs; |
|
} |
|
|
|
/* keeping the surplus of blocksize */ |
|
if (len) { |
|
memcpy(odds, p, len); |
|
ctx->len = len; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static int crypto_xcbc_digest_final(struct shash_desc *pdesc, u8 *out) |
|
{ |
|
struct crypto_shash *parent = pdesc->tfm; |
|
unsigned long alignmask = crypto_shash_alignmask(parent); |
|
struct xcbc_tfm_ctx *tctx = crypto_shash_ctx(parent); |
|
struct xcbc_desc_ctx *ctx = shash_desc_ctx(pdesc); |
|
struct crypto_cipher *tfm = tctx->child; |
|
int bs = crypto_shash_blocksize(parent); |
|
u8 *consts = PTR_ALIGN(&tctx->ctx[0], alignmask + 1); |
|
u8 *odds = PTR_ALIGN(&ctx->ctx[0], alignmask + 1); |
|
u8 *prev = odds + bs; |
|
unsigned int offset = 0; |
|
|
|
if (ctx->len != bs) { |
|
unsigned int rlen; |
|
u8 *p = odds + ctx->len; |
|
|
|
*p = 0x80; |
|
p++; |
|
|
|
rlen = bs - ctx->len -1; |
|
if (rlen) |
|
memset(p, 0, rlen); |
|
|
|
offset += bs; |
|
} |
|
|
|
crypto_xor(prev, odds, bs); |
|
crypto_xor(prev, consts + offset, bs); |
|
|
|
crypto_cipher_encrypt_one(tfm, out, prev); |
|
|
|
return 0; |
|
} |
|
|
|
static int xcbc_init_tfm(struct crypto_tfm *tfm) |
|
{ |
|
struct crypto_cipher *cipher; |
|
struct crypto_instance *inst = (void *)tfm->__crt_alg; |
|
struct crypto_cipher_spawn *spawn = crypto_instance_ctx(inst); |
|
struct xcbc_tfm_ctx *ctx = crypto_tfm_ctx(tfm); |
|
|
|
cipher = crypto_spawn_cipher(spawn); |
|
if (IS_ERR(cipher)) |
|
return PTR_ERR(cipher); |
|
|
|
ctx->child = cipher; |
|
|
|
return 0; |
|
}; |
|
|
|
static void xcbc_exit_tfm(struct crypto_tfm *tfm) |
|
{ |
|
struct xcbc_tfm_ctx *ctx = crypto_tfm_ctx(tfm); |
|
crypto_free_cipher(ctx->child); |
|
} |
|
|
|
static int xcbc_create(struct crypto_template *tmpl, struct rtattr **tb) |
|
{ |
|
struct shash_instance *inst; |
|
struct crypto_cipher_spawn *spawn; |
|
struct crypto_alg *alg; |
|
unsigned long alignmask; |
|
u32 mask; |
|
int err; |
|
|
|
err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_SHASH, &mask); |
|
if (err) |
|
return err; |
|
|
|
inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL); |
|
if (!inst) |
|
return -ENOMEM; |
|
spawn = shash_instance_ctx(inst); |
|
|
|
err = crypto_grab_cipher(spawn, shash_crypto_instance(inst), |
|
crypto_attr_alg_name(tb[1]), 0, mask); |
|
if (err) |
|
goto err_free_inst; |
|
alg = crypto_spawn_cipher_alg(spawn); |
|
|
|
err = -EINVAL; |
|
if (alg->cra_blocksize != XCBC_BLOCKSIZE) |
|
goto err_free_inst; |
|
|
|
err = crypto_inst_setname(shash_crypto_instance(inst), tmpl->name, alg); |
|
if (err) |
|
goto err_free_inst; |
|
|
|
alignmask = alg->cra_alignmask | 3; |
|
inst->alg.base.cra_alignmask = alignmask; |
|
inst->alg.base.cra_priority = alg->cra_priority; |
|
inst->alg.base.cra_blocksize = alg->cra_blocksize; |
|
|
|
inst->alg.digestsize = alg->cra_blocksize; |
|
inst->alg.descsize = ALIGN(sizeof(struct xcbc_desc_ctx), |
|
crypto_tfm_ctx_alignment()) + |
|
(alignmask & |
|
~(crypto_tfm_ctx_alignment() - 1)) + |
|
alg->cra_blocksize * 2; |
|
|
|
inst->alg.base.cra_ctxsize = ALIGN(sizeof(struct xcbc_tfm_ctx), |
|
alignmask + 1) + |
|
alg->cra_blocksize * 2; |
|
inst->alg.base.cra_init = xcbc_init_tfm; |
|
inst->alg.base.cra_exit = xcbc_exit_tfm; |
|
|
|
inst->alg.init = crypto_xcbc_digest_init; |
|
inst->alg.update = crypto_xcbc_digest_update; |
|
inst->alg.final = crypto_xcbc_digest_final; |
|
inst->alg.setkey = crypto_xcbc_digest_setkey; |
|
|
|
inst->free = shash_free_singlespawn_instance; |
|
|
|
err = shash_register_instance(tmpl, inst); |
|
if (err) { |
|
err_free_inst: |
|
shash_free_singlespawn_instance(inst); |
|
} |
|
return err; |
|
} |
|
|
|
static struct crypto_template crypto_xcbc_tmpl = { |
|
.name = "xcbc", |
|
.create = xcbc_create, |
|
.module = THIS_MODULE, |
|
}; |
|
|
|
static int __init crypto_xcbc_module_init(void) |
|
{ |
|
return crypto_register_template(&crypto_xcbc_tmpl); |
|
} |
|
|
|
static void __exit crypto_xcbc_module_exit(void) |
|
{ |
|
crypto_unregister_template(&crypto_xcbc_tmpl); |
|
} |
|
|
|
subsys_initcall(crypto_xcbc_module_init); |
|
module_exit(crypto_xcbc_module_exit); |
|
|
|
MODULE_LICENSE("GPL"); |
|
MODULE_DESCRIPTION("XCBC keyed hash algorithm"); |
|
MODULE_ALIAS_CRYPTO("xcbc");
|
|
|