cregit-Linux how code gets into the kernel

Release 4.18 crypto/ecb.c

Directory: crypto
/*
 * ECB: Electronic CodeBook mode
 *
 * 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/algapi.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/scatterlist.h>
#include <linux/slab.h>


struct crypto_ecb_ctx {
	
struct crypto_cipher *child;
};


static int crypto_ecb_setkey(struct crypto_tfm *parent, const u8 *key, unsigned int keylen) { struct crypto_ecb_ctx *ctx = crypto_tfm_ctx(parent); struct crypto_cipher *child = ctx->child; int err; crypto_cipher_clear_flags(child, CRYPTO_TFM_REQ_MASK); crypto_cipher_set_flags(child, crypto_tfm_get_flags(parent) & CRYPTO_TFM_REQ_MASK); err = crypto_cipher_setkey(child, key, keylen); crypto_tfm_set_flags(parent, crypto_cipher_get_flags(child) & CRYPTO_TFM_RES_MASK); return err; }

Contributors

PersonTokensPropCommitsCommitProp
Herbert Xu87100.00%1100.00%
Total87100.00%1100.00%


static int crypto_ecb_crypt(struct blkcipher_desc *desc, struct blkcipher_walk *walk, struct crypto_cipher *tfm, void (*fn)(struct crypto_tfm *, u8 *, const u8 *)) { int bsize = crypto_cipher_blocksize(tfm); unsigned int nbytes; int err; err = blkcipher_walk_virt(desc, walk); while ((nbytes = walk->nbytes)) { u8 *wsrc = walk->src.virt.addr; u8 *wdst = walk->dst.virt.addr; do { fn(crypto_cipher_tfm(tfm), wdst, wsrc); wsrc += bsize; wdst += bsize; } while ((nbytes -= bsize) >= bsize); err = blkcipher_walk_done(desc, walk, nbytes); } return err; }

Contributors

PersonTokensPropCommitsCommitProp
Herbert Xu147100.00%1100.00%
Total147100.00%1100.00%


static int crypto_ecb_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst, struct scatterlist *src, unsigned int nbytes) { struct blkcipher_walk walk; struct crypto_blkcipher *tfm = desc->tfm; struct crypto_ecb_ctx *ctx = crypto_blkcipher_ctx(tfm); struct crypto_cipher *child = ctx->child; blkcipher_walk_init(&walk, dst, src, nbytes); return crypto_ecb_crypt(desc, &walk, child, crypto_cipher_alg(child)->cia_encrypt); }

Contributors

PersonTokensPropCommitsCommitProp
Herbert Xu87100.00%1100.00%
Total87100.00%1100.00%


static int crypto_ecb_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst, struct scatterlist *src, unsigned int nbytes) { struct blkcipher_walk walk; struct crypto_blkcipher *tfm = desc->tfm; struct crypto_ecb_ctx *ctx = crypto_blkcipher_ctx(tfm); struct crypto_cipher *child = ctx->child; blkcipher_walk_init(&walk, dst, src, nbytes); return crypto_ecb_crypt(desc, &walk, child, crypto_cipher_alg(child)->cia_decrypt); }

Contributors

PersonTokensPropCommitsCommitProp
Herbert Xu87100.00%1100.00%
Total87100.00%1100.00%


static int crypto_ecb_init_tfm(struct crypto_tfm *tfm) { struct crypto_instance *inst = (void *)tfm->__crt_alg; struct crypto_spawn *spawn = crypto_instance_ctx(inst); struct crypto_ecb_ctx *ctx = crypto_tfm_ctx(tfm); struct crypto_cipher *cipher; cipher = crypto_spawn_cipher(spawn); if (IS_ERR(cipher)) return PTR_ERR(cipher); ctx->child = cipher; return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Herbert Xu78100.00%2100.00%
Total78100.00%2100.00%


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

Contributors

PersonTokensPropCommitsCommitProp
Herbert Xu28100.00%1100.00%
Total28100.00%1100.00%


static struct crypto_instance *crypto_ecb_alloc(struct rtattr **tb) { struct crypto_instance *inst; struct crypto_alg *alg; int err; err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_BLKCIPHER); if (err) return ERR_PTR(err); alg = crypto_get_attr_alg(tb, CRYPTO_ALG_TYPE_CIPHER, CRYPTO_ALG_TYPE_MASK); if (IS_ERR(alg)) return ERR_CAST(alg); inst = crypto_alloc_instance("ecb", alg); if (IS_ERR(inst)) goto out_put_alg; inst->alg.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER; inst->alg.cra_priority = alg->cra_priority; inst->alg.cra_blocksize = alg->cra_blocksize; inst->alg.cra_alignmask = alg->cra_alignmask; inst->alg.cra_type = &crypto_blkcipher_type; inst->alg.cra_blkcipher.min_keysize = alg->cra_cipher.cia_min_keysize; inst->alg.cra_blkcipher.max_keysize = alg->cra_cipher.cia_max_keysize; inst->alg.cra_ctxsize = sizeof(struct crypto_ecb_ctx); inst->alg.cra_init = crypto_ecb_init_tfm; inst->alg.cra_exit = crypto_ecb_exit_tfm; inst->alg.cra_blkcipher.setkey = crypto_ecb_setkey; inst->alg.cra_blkcipher.encrypt = crypto_ecb_encrypt; inst->alg.cra_blkcipher.decrypt = crypto_ecb_decrypt; out_put_alg: crypto_mod_put(alg); return inst; }

Contributors

PersonTokensPropCommitsCommitProp
Herbert Xu23199.57%266.67%
David Howells10.43%133.33%
Total232100.00%3100.00%


static void crypto_ecb_free(struct crypto_instance *inst) { crypto_drop_spawn(crypto_instance_ctx(inst)); kfree(inst); }

Contributors

PersonTokensPropCommitsCommitProp
Herbert Xu24100.00%1100.00%
Total24100.00%1100.00%

static struct crypto_template crypto_ecb_tmpl = { .name = "ecb", .alloc = crypto_ecb_alloc, .free = crypto_ecb_free, .module = THIS_MODULE, };
static int __init crypto_ecb_module_init(void) { return crypto_register_template(&crypto_ecb_tmpl); }

Contributors

PersonTokensPropCommitsCommitProp
Herbert Xu16100.00%1100.00%
Total16100.00%1100.00%


static void __exit crypto_ecb_module_exit(void) { crypto_unregister_template(&crypto_ecb_tmpl); }

Contributors

PersonTokensPropCommitsCommitProp
Herbert Xu15100.00%1100.00%
Total15100.00%1100.00%

module_init(crypto_ecb_module_init); module_exit(crypto_ecb_module_exit); MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("ECB block cipher algorithm"); MODULE_ALIAS_CRYPTO("ecb");

Overall Contributors

PersonTokensPropCommitsCommitProp
Herbert Xu87999.32%360.00%
Kees Cook50.56%120.00%
David Howells10.11%120.00%
Total885100.00%5100.00%
Directory: crypto
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