344 lines
8.8 KiB
C
344 lines
8.8 KiB
C
/*
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* Asynchronous block chaining cipher operations.
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*
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* This is the asynchronous version of blkcipher.c indicating completion
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* via a callback.
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*
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* Copyright (c) 2006 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/internal/skcipher.h>
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#include <linux/err.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/rtnetlink.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/seq_file.h>
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#include "internal.h"
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static int setkey_unaligned(struct crypto_ablkcipher *tfm, const u8 *key,
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unsigned int keylen)
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{
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struct ablkcipher_alg *cipher = crypto_ablkcipher_alg(tfm);
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unsigned long alignmask = crypto_ablkcipher_alignmask(tfm);
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int ret;
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u8 *buffer, *alignbuffer;
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unsigned long absize;
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absize = keylen + alignmask;
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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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ret = cipher->setkey(tfm, alignbuffer, keylen);
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memset(alignbuffer, 0, keylen);
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kfree(buffer);
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return ret;
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}
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static int setkey(struct crypto_ablkcipher *tfm, const u8 *key,
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unsigned int keylen)
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{
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struct ablkcipher_alg *cipher = crypto_ablkcipher_alg(tfm);
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unsigned long alignmask = crypto_ablkcipher_alignmask(tfm);
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if (keylen < cipher->min_keysize || keylen > cipher->max_keysize) {
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crypto_ablkcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
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return -EINVAL;
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}
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if ((unsigned long)key & alignmask)
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return setkey_unaligned(tfm, key, keylen);
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return cipher->setkey(tfm, key, keylen);
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}
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static unsigned int crypto_ablkcipher_ctxsize(struct crypto_alg *alg, u32 type,
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u32 mask)
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{
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return alg->cra_ctxsize;
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}
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int skcipher_null_givencrypt(struct skcipher_givcrypt_request *req)
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{
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return crypto_ablkcipher_encrypt(&req->creq);
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}
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int skcipher_null_givdecrypt(struct skcipher_givcrypt_request *req)
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{
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return crypto_ablkcipher_decrypt(&req->creq);
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}
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static int crypto_init_ablkcipher_ops(struct crypto_tfm *tfm, u32 type,
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u32 mask)
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{
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struct ablkcipher_alg *alg = &tfm->__crt_alg->cra_ablkcipher;
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struct ablkcipher_tfm *crt = &tfm->crt_ablkcipher;
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if (alg->ivsize > PAGE_SIZE / 8)
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return -EINVAL;
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crt->setkey = setkey;
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crt->encrypt = alg->encrypt;
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crt->decrypt = alg->decrypt;
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if (!alg->ivsize) {
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crt->givencrypt = skcipher_null_givencrypt;
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crt->givdecrypt = skcipher_null_givdecrypt;
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}
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crt->base = __crypto_ablkcipher_cast(tfm);
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crt->ivsize = alg->ivsize;
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return 0;
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}
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static void crypto_ablkcipher_show(struct seq_file *m, struct crypto_alg *alg)
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__attribute__ ((unused));
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static void crypto_ablkcipher_show(struct seq_file *m, struct crypto_alg *alg)
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{
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struct ablkcipher_alg *ablkcipher = &alg->cra_ablkcipher;
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seq_printf(m, "type : ablkcipher\n");
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seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
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"yes" : "no");
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seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
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seq_printf(m, "min keysize : %u\n", ablkcipher->min_keysize);
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seq_printf(m, "max keysize : %u\n", ablkcipher->max_keysize);
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seq_printf(m, "ivsize : %u\n", ablkcipher->ivsize);
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seq_printf(m, "geniv : %s\n", ablkcipher->geniv ?: "<default>");
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}
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const struct crypto_type crypto_ablkcipher_type = {
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.ctxsize = crypto_ablkcipher_ctxsize,
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.init = crypto_init_ablkcipher_ops,
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#ifdef CONFIG_PROC_FS
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.show = crypto_ablkcipher_show,
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#endif
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};
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EXPORT_SYMBOL_GPL(crypto_ablkcipher_type);
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static int no_givdecrypt(struct skcipher_givcrypt_request *req)
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{
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return -ENOSYS;
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}
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static int crypto_init_givcipher_ops(struct crypto_tfm *tfm, u32 type,
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u32 mask)
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{
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struct ablkcipher_alg *alg = &tfm->__crt_alg->cra_ablkcipher;
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struct ablkcipher_tfm *crt = &tfm->crt_ablkcipher;
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if (alg->ivsize > PAGE_SIZE / 8)
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return -EINVAL;
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crt->setkey = tfm->__crt_alg->cra_flags & CRYPTO_ALG_GENIV ?
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alg->setkey : setkey;
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crt->encrypt = alg->encrypt;
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crt->decrypt = alg->decrypt;
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crt->givencrypt = alg->givencrypt;
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crt->givdecrypt = alg->givdecrypt ?: no_givdecrypt;
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crt->base = __crypto_ablkcipher_cast(tfm);
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crt->ivsize = alg->ivsize;
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return 0;
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}
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static void crypto_givcipher_show(struct seq_file *m, struct crypto_alg *alg)
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__attribute__ ((unused));
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static void crypto_givcipher_show(struct seq_file *m, struct crypto_alg *alg)
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{
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struct ablkcipher_alg *ablkcipher = &alg->cra_ablkcipher;
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seq_printf(m, "type : givcipher\n");
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seq_printf(m, "async : %s\n", alg->cra_flags & CRYPTO_ALG_ASYNC ?
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"yes" : "no");
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seq_printf(m, "blocksize : %u\n", alg->cra_blocksize);
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seq_printf(m, "min keysize : %u\n", ablkcipher->min_keysize);
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seq_printf(m, "max keysize : %u\n", ablkcipher->max_keysize);
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seq_printf(m, "ivsize : %u\n", ablkcipher->ivsize);
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seq_printf(m, "geniv : %s\n", ablkcipher->geniv ?: "<built-in>");
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}
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const struct crypto_type crypto_givcipher_type = {
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.ctxsize = crypto_ablkcipher_ctxsize,
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.init = crypto_init_givcipher_ops,
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#ifdef CONFIG_PROC_FS
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.show = crypto_givcipher_show,
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#endif
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};
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EXPORT_SYMBOL_GPL(crypto_givcipher_type);
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const char *crypto_default_geniv(const struct crypto_alg *alg)
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{
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return alg->cra_flags & CRYPTO_ALG_ASYNC ? "eseqiv" : "chainiv";
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}
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static int crypto_givcipher_default(struct crypto_alg *alg, u32 type, u32 mask)
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{
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struct rtattr *tb[3];
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struct {
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struct rtattr attr;
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struct crypto_attr_type data;
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} ptype;
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struct {
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struct rtattr attr;
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struct crypto_attr_alg data;
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} palg;
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struct crypto_template *tmpl;
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struct crypto_instance *inst;
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struct crypto_alg *larval;
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const char *geniv;
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int err;
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larval = crypto_larval_lookup(alg->cra_driver_name,
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CRYPTO_ALG_TYPE_GIVCIPHER,
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CRYPTO_ALG_TYPE_MASK);
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err = PTR_ERR(larval);
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if (IS_ERR(larval))
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goto out;
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err = -EAGAIN;
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if (!crypto_is_larval(larval))
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goto drop_larval;
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ptype.attr.rta_len = sizeof(ptype);
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ptype.attr.rta_type = CRYPTOA_TYPE;
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ptype.data.type = type | CRYPTO_ALG_GENIV;
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/* GENIV tells the template that we're making a default geniv. */
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ptype.data.mask = mask | CRYPTO_ALG_GENIV;
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tb[0] = &ptype.attr;
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palg.attr.rta_len = sizeof(palg);
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palg.attr.rta_type = CRYPTOA_ALG;
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/* Must use the exact name to locate ourselves. */
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memcpy(palg.data.name, alg->cra_driver_name, CRYPTO_MAX_ALG_NAME);
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tb[1] = &palg.attr;
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tb[2] = NULL;
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if ((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
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CRYPTO_ALG_TYPE_BLKCIPHER)
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geniv = alg->cra_blkcipher.geniv;
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else
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geniv = alg->cra_ablkcipher.geniv;
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if (!geniv)
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geniv = crypto_default_geniv(alg);
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tmpl = crypto_lookup_template(geniv);
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err = -ENOENT;
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if (!tmpl)
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goto kill_larval;
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inst = tmpl->alloc(tb);
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err = PTR_ERR(inst);
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if (IS_ERR(inst))
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goto put_tmpl;
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if ((err = crypto_register_instance(tmpl, inst))) {
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tmpl->free(inst);
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goto put_tmpl;
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}
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/* Redo the lookup to use the instance we just registered. */
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err = -EAGAIN;
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put_tmpl:
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crypto_tmpl_put(tmpl);
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kill_larval:
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crypto_larval_kill(larval);
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drop_larval:
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crypto_mod_put(larval);
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out:
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crypto_mod_put(alg);
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return err;
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}
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static struct crypto_alg *crypto_lookup_skcipher(const char *name, u32 type,
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u32 mask)
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{
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struct crypto_alg *alg;
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alg = crypto_alg_mod_lookup(name, type, mask);
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if (IS_ERR(alg))
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return alg;
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if ((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
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CRYPTO_ALG_TYPE_GIVCIPHER)
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return alg;
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if (!((alg->cra_flags & CRYPTO_ALG_TYPE_MASK) ==
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CRYPTO_ALG_TYPE_BLKCIPHER ? alg->cra_blkcipher.ivsize :
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alg->cra_ablkcipher.ivsize))
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return alg;
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return ERR_PTR(crypto_givcipher_default(alg, type, mask));
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}
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int crypto_grab_skcipher(struct crypto_skcipher_spawn *spawn, const char *name,
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u32 type, u32 mask)
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{
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struct crypto_alg *alg;
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int err;
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type = crypto_skcipher_type(type);
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mask = crypto_skcipher_mask(mask);
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alg = crypto_lookup_skcipher(name, type, mask);
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if (IS_ERR(alg))
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return PTR_ERR(alg);
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err = crypto_init_spawn(&spawn->base, alg, spawn->base.inst, mask);
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crypto_mod_put(alg);
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return err;
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}
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EXPORT_SYMBOL_GPL(crypto_grab_skcipher);
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struct crypto_ablkcipher *crypto_alloc_ablkcipher(const char *alg_name,
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u32 type, u32 mask)
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{
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struct crypto_tfm *tfm;
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int err;
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type = crypto_skcipher_type(type);
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mask = crypto_skcipher_mask(mask);
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for (;;) {
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struct crypto_alg *alg;
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alg = crypto_lookup_skcipher(alg_name, type, mask);
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if (IS_ERR(alg)) {
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err = PTR_ERR(alg);
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goto err;
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}
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tfm = __crypto_alloc_tfm(alg, type, mask);
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if (!IS_ERR(tfm))
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return __crypto_ablkcipher_cast(tfm);
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crypto_mod_put(alg);
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err = PTR_ERR(tfm);
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err:
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if (err != -EAGAIN)
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break;
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if (signal_pending(current)) {
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err = -EINTR;
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break;
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}
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}
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return ERR_PTR(err);
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}
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EXPORT_SYMBOL_GPL(crypto_alloc_ablkcipher);
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