cregit-Linux how code gets into the kernel

Release 4.11 crypto/xcbc.c

Directory: crypto
/*
 * Copyright (C)2006 USAGI/WIDE Project
 *
 * 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.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * Author:
 *      Kazunori Miyazawa <miyazawa@linux-ipv6.org>
 */

#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[];
};


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); int bs = crypto_shash_blocksize(parent); u8 *consts = PTR_ALIGN(&ctx->ctx[0], alignmask + 1); int err = 0; u8 key1[bs]; 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); }

Contributors

PersonTokensPropCommitsCommitProp
Kazunori Miyazawa8150.00%125.00%
Herbert Xu8150.00%375.00%
Total162100.00%4100.00%


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; }

Contributors

PersonTokensPropCommitsCommitProp
Kazunori Miyazawa4555.56%125.00%
Herbert Xu3543.21%250.00%
Adrian Bunk11.23%125.00%
Total81100.00%4100.00%


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; }

Contributors

PersonTokensPropCommitsCommitProp
Kazunori Miyazawa19274.42%116.67%
Herbert Xu6525.19%466.67%
Adrian Bunk10.39%116.67%
Total258100.00%6100.00%


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; }

Contributors

PersonTokensPropCommitsCommitProp
Kazunori Miyazawa12759.62%116.67%
Herbert Xu8539.91%466.67%
Adrian Bunk10.47%116.67%
Total213100.00%6100.00%


static int xcbc_init_tfm(struct crypto_tfm *tfm) { struct crypto_cipher *cipher; struct crypto_instance *inst = (void *)tfm->__crt_alg; struct crypto_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; }

Contributors

PersonTokensPropCommitsCommitProp
Kazunori Miyazawa6684.62%125.00%
Herbert Xu1215.38%375.00%
Total78100.00%4100.00%

;
static void xcbc_exit_tfm(struct crypto_tfm *tfm) { struct xcbc_tfm_ctx *ctx = crypto_tfm_ctx(tfm); crypto_free_cipher(ctx->child); }

Contributors

PersonTokensPropCommitsCommitProp
Kazunori Miyazawa2692.86%133.33%
Herbert Xu27.14%266.67%
Total28100.00%3100.00%


static int xcbc_create(struct crypto_template *tmpl, struct rtattr **tb) { struct shash_instance *inst; struct crypto_alg *alg; unsigned long alignmask; int err; err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_SHASH); if (err) return err; alg = crypto_get_attr_alg(tb, CRYPTO_ALG_TYPE_CIPHER, CRYPTO_ALG_TYPE_MASK); if (IS_ERR(alg)) return PTR_ERR(alg); switch(alg->cra_blocksize) { case 16: break; default: goto out_put_alg; } inst = shash_alloc_instance("xcbc", alg); err = PTR_ERR(inst); if (IS_ERR(inst)) goto out_put_alg; err = crypto_init_spawn(shash_instance_ctx(inst), alg, shash_crypto_instance(inst), CRYPTO_ALG_TYPE_MASK); if (err) goto out_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; err = shash_register_instance(tmpl, inst); if (err) { out_free_inst: shash_free_instance(shash_crypto_instance(inst)); } out_put_alg: crypto_mod_put(alg); return err; }

Contributors

PersonTokensPropCommitsCommitProp
Kazunori Miyazawa18252.91%114.29%
Herbert Xu14040.70%571.43%
Steffen Klassert226.40%114.29%
Total344100.00%7100.00%

static struct crypto_template crypto_xcbc_tmpl = { .name = "xcbc", .create = xcbc_create, .free = shash_free_instance, .module = THIS_MODULE, };
static int __init crypto_xcbc_module_init(void) { return crypto_register_template(&crypto_xcbc_tmpl); }

Contributors

PersonTokensPropCommitsCommitProp
Kazunori Miyazawa16100.00%1100.00%
Total16100.00%1100.00%


static void __exit crypto_xcbc_module_exit(void) { crypto_unregister_template(&crypto_xcbc_tmpl); }

Contributors

PersonTokensPropCommitsCommitProp
Kazunori Miyazawa15100.00%1100.00%
Total15100.00%1100.00%

module_init(crypto_xcbc_module_init); module_exit(crypto_xcbc_module_exit); MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("XCBC keyed hash algorithm"); MODULE_ALIAS_CRYPTO("xcbc");

Overall Contributors

PersonTokensPropCommitsCommitProp
Kazunori Miyazawa85064.25%17.69%
Herbert Xu43933.18%861.54%
Steffen Klassert221.66%17.69%
Kees Cook50.38%17.69%
Adrian Bunk40.30%17.69%
Paul Gortmaker30.23%17.69%
Total1323100.00%13100.00%
Directory: crypto
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