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37d4008484
* git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6: (31 commits) crypto: aes_generic - Fix checkpatch errors crypto: fcrypt - Fix checkpatch errors crypto: ecb - Fix checkpatch errors crypto: des_generic - Fix checkpatch errors crypto: deflate - Fix checkpatch errors crypto: crypto_null - Fix checkpatch errors crypto: cipher - Fix checkpatch errors crypto: crc32 - Fix checkpatch errors crypto: compress - Fix checkpatch errors crypto: cast6 - Fix checkpatch errors crypto: cast5 - Fix checkpatch errors crypto: camellia - Fix checkpatch errors crypto: authenc - Fix checkpatch errors crypto: api - Fix checkpatch errors crypto: anubis - Fix checkpatch errors crypto: algapi - Fix checkpatch errors crypto: blowfish - Fix checkpatch errors crypto: aead - Fix checkpatch errors crypto: ablkcipher - Fix checkpatch errors crypto: pcrypt - call the complete function on error ...
563 lines
14 KiB
C
563 lines
14 KiB
C
/*
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* Cryptographic API.
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*
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* s390 implementation of the AES Cipher Algorithm.
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*
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* s390 Version:
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* Copyright IBM Corp. 2005,2007
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* Author(s): Jan Glauber (jang@de.ibm.com)
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* Sebastian Siewior (sebastian@breakpoint.cc> SW-Fallback
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*
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* Derived from "crypto/aes_generic.c"
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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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#define KMSG_COMPONENT "aes_s390"
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#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
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#include <crypto/aes.h>
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#include <crypto/algapi.h>
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#include <linux/err.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include "crypt_s390.h"
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#define AES_KEYLEN_128 1
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#define AES_KEYLEN_192 2
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#define AES_KEYLEN_256 4
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static char keylen_flag = 0;
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struct s390_aes_ctx {
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u8 iv[AES_BLOCK_SIZE];
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u8 key[AES_MAX_KEY_SIZE];
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long enc;
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long dec;
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int key_len;
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union {
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struct crypto_blkcipher *blk;
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struct crypto_cipher *cip;
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} fallback;
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};
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/*
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* Check if the key_len is supported by the HW.
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* Returns 0 if it is, a positive number if it is not and software fallback is
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* required or a negative number in case the key size is not valid
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*/
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static int need_fallback(unsigned int key_len)
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{
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switch (key_len) {
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case 16:
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if (!(keylen_flag & AES_KEYLEN_128))
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return 1;
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break;
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case 24:
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if (!(keylen_flag & AES_KEYLEN_192))
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return 1;
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break;
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case 32:
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if (!(keylen_flag & AES_KEYLEN_256))
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return 1;
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break;
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default:
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return -1;
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break;
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}
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return 0;
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}
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static int setkey_fallback_cip(struct crypto_tfm *tfm, const u8 *in_key,
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unsigned int key_len)
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{
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struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
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int ret;
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sctx->fallback.cip->base.crt_flags &= ~CRYPTO_TFM_REQ_MASK;
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sctx->fallback.cip->base.crt_flags |= (tfm->crt_flags &
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CRYPTO_TFM_REQ_MASK);
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ret = crypto_cipher_setkey(sctx->fallback.cip, in_key, key_len);
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if (ret) {
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tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK;
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tfm->crt_flags |= (sctx->fallback.cip->base.crt_flags &
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CRYPTO_TFM_RES_MASK);
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}
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return ret;
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}
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static int aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
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unsigned int key_len)
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{
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struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
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u32 *flags = &tfm->crt_flags;
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int ret;
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ret = need_fallback(key_len);
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if (ret < 0) {
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*flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
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return -EINVAL;
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}
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sctx->key_len = key_len;
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if (!ret) {
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memcpy(sctx->key, in_key, key_len);
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return 0;
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}
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return setkey_fallback_cip(tfm, in_key, key_len);
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}
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static void aes_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
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{
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const struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
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if (unlikely(need_fallback(sctx->key_len))) {
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crypto_cipher_encrypt_one(sctx->fallback.cip, out, in);
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return;
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}
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switch (sctx->key_len) {
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case 16:
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crypt_s390_km(KM_AES_128_ENCRYPT, &sctx->key, out, in,
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AES_BLOCK_SIZE);
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break;
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case 24:
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crypt_s390_km(KM_AES_192_ENCRYPT, &sctx->key, out, in,
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AES_BLOCK_SIZE);
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break;
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case 32:
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crypt_s390_km(KM_AES_256_ENCRYPT, &sctx->key, out, in,
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AES_BLOCK_SIZE);
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break;
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}
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}
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static void aes_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
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{
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const struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
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if (unlikely(need_fallback(sctx->key_len))) {
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crypto_cipher_decrypt_one(sctx->fallback.cip, out, in);
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return;
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}
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switch (sctx->key_len) {
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case 16:
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crypt_s390_km(KM_AES_128_DECRYPT, &sctx->key, out, in,
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AES_BLOCK_SIZE);
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break;
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case 24:
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crypt_s390_km(KM_AES_192_DECRYPT, &sctx->key, out, in,
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AES_BLOCK_SIZE);
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break;
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case 32:
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crypt_s390_km(KM_AES_256_DECRYPT, &sctx->key, out, in,
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AES_BLOCK_SIZE);
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break;
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}
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}
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static int fallback_init_cip(struct crypto_tfm *tfm)
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{
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const char *name = tfm->__crt_alg->cra_name;
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struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
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sctx->fallback.cip = crypto_alloc_cipher(name, 0,
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CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK);
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if (IS_ERR(sctx->fallback.cip)) {
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pr_err("Allocating AES fallback algorithm %s failed\n",
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name);
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return PTR_ERR(sctx->fallback.cip);
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}
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return 0;
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}
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static void fallback_exit_cip(struct crypto_tfm *tfm)
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{
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struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
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crypto_free_cipher(sctx->fallback.cip);
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sctx->fallback.cip = NULL;
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}
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static struct crypto_alg aes_alg = {
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.cra_name = "aes",
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.cra_driver_name = "aes-s390",
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.cra_priority = CRYPT_S390_PRIORITY,
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.cra_flags = CRYPTO_ALG_TYPE_CIPHER |
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CRYPTO_ALG_NEED_FALLBACK,
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.cra_blocksize = AES_BLOCK_SIZE,
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.cra_ctxsize = sizeof(struct s390_aes_ctx),
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.cra_module = THIS_MODULE,
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.cra_list = LIST_HEAD_INIT(aes_alg.cra_list),
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.cra_init = fallback_init_cip,
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.cra_exit = fallback_exit_cip,
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.cra_u = {
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.cipher = {
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.cia_min_keysize = AES_MIN_KEY_SIZE,
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.cia_max_keysize = AES_MAX_KEY_SIZE,
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.cia_setkey = aes_set_key,
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.cia_encrypt = aes_encrypt,
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.cia_decrypt = aes_decrypt,
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}
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}
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};
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static int setkey_fallback_blk(struct crypto_tfm *tfm, const u8 *key,
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unsigned int len)
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{
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struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
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unsigned int ret;
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sctx->fallback.blk->base.crt_flags &= ~CRYPTO_TFM_REQ_MASK;
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sctx->fallback.blk->base.crt_flags |= (tfm->crt_flags &
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CRYPTO_TFM_REQ_MASK);
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ret = crypto_blkcipher_setkey(sctx->fallback.blk, key, len);
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if (ret) {
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tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK;
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tfm->crt_flags |= (sctx->fallback.blk->base.crt_flags &
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CRYPTO_TFM_RES_MASK);
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}
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return ret;
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}
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static int fallback_blk_dec(struct blkcipher_desc *desc,
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struct scatterlist *dst, struct scatterlist *src,
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unsigned int nbytes)
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{
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unsigned int ret;
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struct crypto_blkcipher *tfm;
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struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
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tfm = desc->tfm;
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desc->tfm = sctx->fallback.blk;
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ret = crypto_blkcipher_decrypt_iv(desc, dst, src, nbytes);
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desc->tfm = tfm;
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return ret;
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}
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static int fallback_blk_enc(struct blkcipher_desc *desc,
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struct scatterlist *dst, struct scatterlist *src,
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unsigned int nbytes)
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{
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unsigned int ret;
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struct crypto_blkcipher *tfm;
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struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
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tfm = desc->tfm;
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desc->tfm = sctx->fallback.blk;
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ret = crypto_blkcipher_encrypt_iv(desc, dst, src, nbytes);
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desc->tfm = tfm;
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return ret;
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}
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static int ecb_aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
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unsigned int key_len)
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{
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struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
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int ret;
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ret = need_fallback(key_len);
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if (ret > 0) {
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sctx->key_len = key_len;
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return setkey_fallback_blk(tfm, in_key, key_len);
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}
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switch (key_len) {
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case 16:
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sctx->enc = KM_AES_128_ENCRYPT;
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sctx->dec = KM_AES_128_DECRYPT;
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break;
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case 24:
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sctx->enc = KM_AES_192_ENCRYPT;
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sctx->dec = KM_AES_192_DECRYPT;
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break;
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case 32:
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sctx->enc = KM_AES_256_ENCRYPT;
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sctx->dec = KM_AES_256_DECRYPT;
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break;
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}
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return aes_set_key(tfm, in_key, key_len);
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}
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static int ecb_aes_crypt(struct blkcipher_desc *desc, long func, void *param,
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struct blkcipher_walk *walk)
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{
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int ret = blkcipher_walk_virt(desc, walk);
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unsigned int nbytes;
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while ((nbytes = walk->nbytes)) {
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/* only use complete blocks */
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unsigned int n = nbytes & ~(AES_BLOCK_SIZE - 1);
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u8 *out = walk->dst.virt.addr;
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u8 *in = walk->src.virt.addr;
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ret = crypt_s390_km(func, param, out, in, n);
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BUG_ON((ret < 0) || (ret != n));
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nbytes &= AES_BLOCK_SIZE - 1;
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ret = blkcipher_walk_done(desc, walk, nbytes);
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}
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return ret;
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}
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static int ecb_aes_encrypt(struct blkcipher_desc *desc,
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struct scatterlist *dst, struct scatterlist *src,
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unsigned int nbytes)
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{
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struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
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struct blkcipher_walk walk;
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if (unlikely(need_fallback(sctx->key_len)))
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return fallback_blk_enc(desc, dst, src, nbytes);
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blkcipher_walk_init(&walk, dst, src, nbytes);
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return ecb_aes_crypt(desc, sctx->enc, sctx->key, &walk);
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}
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static int ecb_aes_decrypt(struct blkcipher_desc *desc,
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struct scatterlist *dst, struct scatterlist *src,
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unsigned int nbytes)
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{
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struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
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struct blkcipher_walk walk;
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if (unlikely(need_fallback(sctx->key_len)))
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return fallback_blk_dec(desc, dst, src, nbytes);
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blkcipher_walk_init(&walk, dst, src, nbytes);
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return ecb_aes_crypt(desc, sctx->dec, sctx->key, &walk);
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}
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static int fallback_init_blk(struct crypto_tfm *tfm)
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{
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const char *name = tfm->__crt_alg->cra_name;
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struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
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sctx->fallback.blk = crypto_alloc_blkcipher(name, 0,
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CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK);
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if (IS_ERR(sctx->fallback.blk)) {
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pr_err("Allocating AES fallback algorithm %s failed\n",
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name);
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return PTR_ERR(sctx->fallback.blk);
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}
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return 0;
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}
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static void fallback_exit_blk(struct crypto_tfm *tfm)
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{
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struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
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crypto_free_blkcipher(sctx->fallback.blk);
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sctx->fallback.blk = NULL;
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}
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static struct crypto_alg ecb_aes_alg = {
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.cra_name = "ecb(aes)",
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.cra_driver_name = "ecb-aes-s390",
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.cra_priority = CRYPT_S390_COMPOSITE_PRIORITY,
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.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER |
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CRYPTO_ALG_NEED_FALLBACK,
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.cra_blocksize = AES_BLOCK_SIZE,
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.cra_ctxsize = sizeof(struct s390_aes_ctx),
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.cra_type = &crypto_blkcipher_type,
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.cra_module = THIS_MODULE,
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.cra_list = LIST_HEAD_INIT(ecb_aes_alg.cra_list),
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.cra_init = fallback_init_blk,
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.cra_exit = fallback_exit_blk,
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.cra_u = {
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.blkcipher = {
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.min_keysize = AES_MIN_KEY_SIZE,
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.max_keysize = AES_MAX_KEY_SIZE,
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.setkey = ecb_aes_set_key,
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.encrypt = ecb_aes_encrypt,
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.decrypt = ecb_aes_decrypt,
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}
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}
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};
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static int cbc_aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
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unsigned int key_len)
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{
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struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
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int ret;
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ret = need_fallback(key_len);
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if (ret > 0) {
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sctx->key_len = key_len;
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return setkey_fallback_blk(tfm, in_key, key_len);
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}
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switch (key_len) {
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case 16:
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sctx->enc = KMC_AES_128_ENCRYPT;
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sctx->dec = KMC_AES_128_DECRYPT;
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break;
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case 24:
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sctx->enc = KMC_AES_192_ENCRYPT;
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sctx->dec = KMC_AES_192_DECRYPT;
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break;
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case 32:
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sctx->enc = KMC_AES_256_ENCRYPT;
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sctx->dec = KMC_AES_256_DECRYPT;
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break;
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}
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return aes_set_key(tfm, in_key, key_len);
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}
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static int cbc_aes_crypt(struct blkcipher_desc *desc, long func, void *param,
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struct blkcipher_walk *walk)
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{
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int ret = blkcipher_walk_virt(desc, walk);
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unsigned int nbytes = walk->nbytes;
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if (!nbytes)
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goto out;
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memcpy(param, walk->iv, AES_BLOCK_SIZE);
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do {
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/* only use complete blocks */
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unsigned int n = nbytes & ~(AES_BLOCK_SIZE - 1);
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u8 *out = walk->dst.virt.addr;
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u8 *in = walk->src.virt.addr;
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ret = crypt_s390_kmc(func, param, out, in, n);
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BUG_ON((ret < 0) || (ret != n));
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nbytes &= AES_BLOCK_SIZE - 1;
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ret = blkcipher_walk_done(desc, walk, nbytes);
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} while ((nbytes = walk->nbytes));
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memcpy(walk->iv, param, AES_BLOCK_SIZE);
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out:
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return ret;
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}
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static int cbc_aes_encrypt(struct blkcipher_desc *desc,
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struct scatterlist *dst, struct scatterlist *src,
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unsigned int nbytes)
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{
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struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
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struct blkcipher_walk walk;
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if (unlikely(need_fallback(sctx->key_len)))
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return fallback_blk_enc(desc, dst, src, nbytes);
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blkcipher_walk_init(&walk, dst, src, nbytes);
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return cbc_aes_crypt(desc, sctx->enc, sctx->iv, &walk);
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}
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static int cbc_aes_decrypt(struct blkcipher_desc *desc,
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struct scatterlist *dst, struct scatterlist *src,
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unsigned int nbytes)
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{
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struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
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struct blkcipher_walk walk;
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if (unlikely(need_fallback(sctx->key_len)))
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return fallback_blk_dec(desc, dst, src, nbytes);
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blkcipher_walk_init(&walk, dst, src, nbytes);
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return cbc_aes_crypt(desc, sctx->dec, sctx->iv, &walk);
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}
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static struct crypto_alg cbc_aes_alg = {
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.cra_name = "cbc(aes)",
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.cra_driver_name = "cbc-aes-s390",
|
|
.cra_priority = CRYPT_S390_COMPOSITE_PRIORITY,
|
|
.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER |
|
|
CRYPTO_ALG_NEED_FALLBACK,
|
|
.cra_blocksize = AES_BLOCK_SIZE,
|
|
.cra_ctxsize = sizeof(struct s390_aes_ctx),
|
|
.cra_type = &crypto_blkcipher_type,
|
|
.cra_module = THIS_MODULE,
|
|
.cra_list = LIST_HEAD_INIT(cbc_aes_alg.cra_list),
|
|
.cra_init = fallback_init_blk,
|
|
.cra_exit = fallback_exit_blk,
|
|
.cra_u = {
|
|
.blkcipher = {
|
|
.min_keysize = AES_MIN_KEY_SIZE,
|
|
.max_keysize = AES_MAX_KEY_SIZE,
|
|
.ivsize = AES_BLOCK_SIZE,
|
|
.setkey = cbc_aes_set_key,
|
|
.encrypt = cbc_aes_encrypt,
|
|
.decrypt = cbc_aes_decrypt,
|
|
}
|
|
}
|
|
};
|
|
|
|
static int __init aes_s390_init(void)
|
|
{
|
|
int ret;
|
|
|
|
if (crypt_s390_func_available(KM_AES_128_ENCRYPT))
|
|
keylen_flag |= AES_KEYLEN_128;
|
|
if (crypt_s390_func_available(KM_AES_192_ENCRYPT))
|
|
keylen_flag |= AES_KEYLEN_192;
|
|
if (crypt_s390_func_available(KM_AES_256_ENCRYPT))
|
|
keylen_flag |= AES_KEYLEN_256;
|
|
|
|
if (!keylen_flag)
|
|
return -EOPNOTSUPP;
|
|
|
|
/* z9 109 and z9 BC/EC only support 128 bit key length */
|
|
if (keylen_flag == AES_KEYLEN_128)
|
|
pr_info("AES hardware acceleration is only available for"
|
|
" 128-bit keys\n");
|
|
|
|
ret = crypto_register_alg(&aes_alg);
|
|
if (ret)
|
|
goto aes_err;
|
|
|
|
ret = crypto_register_alg(&ecb_aes_alg);
|
|
if (ret)
|
|
goto ecb_aes_err;
|
|
|
|
ret = crypto_register_alg(&cbc_aes_alg);
|
|
if (ret)
|
|
goto cbc_aes_err;
|
|
|
|
out:
|
|
return ret;
|
|
|
|
cbc_aes_err:
|
|
crypto_unregister_alg(&ecb_aes_alg);
|
|
ecb_aes_err:
|
|
crypto_unregister_alg(&aes_alg);
|
|
aes_err:
|
|
goto out;
|
|
}
|
|
|
|
static void __exit aes_s390_fini(void)
|
|
{
|
|
crypto_unregister_alg(&cbc_aes_alg);
|
|
crypto_unregister_alg(&ecb_aes_alg);
|
|
crypto_unregister_alg(&aes_alg);
|
|
}
|
|
|
|
module_init(aes_s390_init);
|
|
module_exit(aes_s390_fini);
|
|
|
|
MODULE_ALIAS("aes-all");
|
|
|
|
MODULE_DESCRIPTION("Rijndael (AES) Cipher Algorithm");
|
|
MODULE_LICENSE("GPL");
|