380 lines
8.8 KiB
C
380 lines
8.8 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 (C) 2005 IBM Deutschland GmbH, IBM Corporation
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* Author(s): Jan Glauber (jang@de.ibm.com)
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*
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* Derived from "crypto/aes.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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#include <crypto/algapi.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_MIN_KEY_SIZE 16
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#define AES_MAX_KEY_SIZE 32
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/* data block size for all key lengths */
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#define AES_BLOCK_SIZE 16
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int has_aes_128 = 0;
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int has_aes_192 = 0;
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int has_aes_256 = 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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};
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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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switch (key_len) {
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case 16:
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if (!has_aes_128)
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goto fail;
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break;
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case 24:
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if (!has_aes_192)
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goto fail;
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break;
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case 32:
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if (!has_aes_256)
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goto fail;
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break;
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default:
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/* invalid key length */
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goto fail;
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break;
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}
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sctx->key_len = key_len;
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memcpy(sctx->key, in_key, key_len);
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return 0;
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fail:
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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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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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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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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 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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.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_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 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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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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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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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 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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.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_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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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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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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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",
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.cra_priority = CRYPT_S390_COMPOSITE_PRIORITY,
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.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
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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(cbc_aes_alg.cra_list),
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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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.ivsize = AES_BLOCK_SIZE,
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.setkey = cbc_aes_set_key,
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.encrypt = cbc_aes_encrypt,
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.decrypt = cbc_aes_decrypt,
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}
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}
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};
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static int __init aes_init(void)
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{
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int ret;
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if (crypt_s390_func_available(KM_AES_128_ENCRYPT))
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has_aes_128 = 1;
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if (crypt_s390_func_available(KM_AES_192_ENCRYPT))
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has_aes_192 = 1;
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if (crypt_s390_func_available(KM_AES_256_ENCRYPT))
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has_aes_256 = 1;
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if (!has_aes_128 && !has_aes_192 && !has_aes_256)
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return -ENOSYS;
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ret = crypto_register_alg(&aes_alg);
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if (ret != 0) {
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printk(KERN_INFO "crypt_s390: aes-s390 couldn't be loaded.\n");
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goto aes_err;
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}
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ret = crypto_register_alg(&ecb_aes_alg);
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if (ret != 0) {
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printk(KERN_INFO
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"crypt_s390: ecb-aes-s390 couldn't be loaded.\n");
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goto ecb_aes_err;
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}
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ret = crypto_register_alg(&cbc_aes_alg);
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if (ret != 0) {
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printk(KERN_INFO
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"crypt_s390: cbc-aes-s390 couldn't be loaded.\n");
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goto cbc_aes_err;
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}
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out:
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return ret;
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cbc_aes_err:
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crypto_unregister_alg(&ecb_aes_alg);
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ecb_aes_err:
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crypto_unregister_alg(&aes_alg);
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aes_err:
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goto out;
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}
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static void __exit aes_fini(void)
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{
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crypto_unregister_alg(&cbc_aes_alg);
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crypto_unregister_alg(&ecb_aes_alg);
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crypto_unregister_alg(&aes_alg);
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}
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module_init(aes_init);
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module_exit(aes_fini);
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MODULE_ALIAS("aes");
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MODULE_DESCRIPTION("Rijndael (AES) Cipher Algorithm");
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MODULE_LICENSE("GPL");
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