285 lines
6.7 KiB
C
285 lines
6.7 KiB
C
/*
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* Cryptographic API.
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*
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* z990 implementation of the DES Cipher Algorithm.
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*
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* Copyright (c) 2003 IBM Deutschland Entwicklung GmbH, IBM Corporation
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* Author(s): Thomas Spatzier (tspat@de.ibm.com)
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*
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/mm.h>
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#include <linux/errno.h>
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#include <asm/scatterlist.h>
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#include <linux/crypto.h>
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#include "crypt_z990.h"
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#include "crypto_des.h"
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#define DES_BLOCK_SIZE 8
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#define DES_KEY_SIZE 8
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#define DES3_128_KEY_SIZE (2 * DES_KEY_SIZE)
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#define DES3_128_BLOCK_SIZE DES_BLOCK_SIZE
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#define DES3_192_KEY_SIZE (3 * DES_KEY_SIZE)
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#define DES3_192_BLOCK_SIZE DES_BLOCK_SIZE
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struct crypt_z990_des_ctx {
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u8 iv[DES_BLOCK_SIZE];
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u8 key[DES_KEY_SIZE];
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};
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struct crypt_z990_des3_128_ctx {
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u8 iv[DES_BLOCK_SIZE];
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u8 key[DES3_128_KEY_SIZE];
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};
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struct crypt_z990_des3_192_ctx {
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u8 iv[DES_BLOCK_SIZE];
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u8 key[DES3_192_KEY_SIZE];
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};
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static int
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des_setkey(void *ctx, const u8 *key, unsigned int keylen, u32 *flags)
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{
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struct crypt_z990_des_ctx *dctx;
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int ret;
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dctx = ctx;
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//test if key is valid (not a weak key)
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ret = crypto_des_check_key(key, keylen, flags);
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if (ret == 0){
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memcpy(dctx->key, key, keylen);
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}
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return ret;
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}
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static void
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des_encrypt(void *ctx, u8 *dst, const u8 *src)
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{
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struct crypt_z990_des_ctx *dctx;
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dctx = ctx;
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crypt_z990_km(KM_DEA_ENCRYPT, dctx->key, dst, src, DES_BLOCK_SIZE);
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}
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static void
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des_decrypt(void *ctx, u8 *dst, const u8 *src)
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{
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struct crypt_z990_des_ctx *dctx;
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dctx = ctx;
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crypt_z990_km(KM_DEA_DECRYPT, dctx->key, dst, src, DES_BLOCK_SIZE);
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}
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static struct crypto_alg des_alg = {
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.cra_name = "des",
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.cra_flags = CRYPTO_ALG_TYPE_CIPHER,
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.cra_blocksize = DES_BLOCK_SIZE,
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.cra_ctxsize = sizeof(struct crypt_z990_des_ctx),
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.cra_module = THIS_MODULE,
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.cra_list = LIST_HEAD_INIT(des_alg.cra_list),
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.cra_u = { .cipher = {
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.cia_min_keysize = DES_KEY_SIZE,
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.cia_max_keysize = DES_KEY_SIZE,
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.cia_setkey = des_setkey,
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.cia_encrypt = des_encrypt,
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.cia_decrypt = des_decrypt } }
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};
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/*
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* RFC2451:
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*
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* For DES-EDE3, there is no known need to reject weak or
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* complementation keys. Any weakness is obviated by the use of
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* multiple keys.
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*
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* However, if the two independent 64-bit keys are equal,
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* then the DES3 operation is simply the same as DES.
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* Implementers MUST reject keys that exhibit this property.
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*
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*/
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static int
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des3_128_setkey(void *ctx, const u8 *key, unsigned int keylen, u32 *flags)
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{
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int i, ret;
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struct crypt_z990_des3_128_ctx *dctx;
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const u8* temp_key = key;
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dctx = ctx;
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if (!(memcmp(key, &key[DES_KEY_SIZE], DES_KEY_SIZE))) {
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*flags |= CRYPTO_TFM_RES_BAD_KEY_SCHED;
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return -EINVAL;
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}
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for (i = 0; i < 2; i++, temp_key += DES_KEY_SIZE) {
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ret = crypto_des_check_key(temp_key, DES_KEY_SIZE, flags);
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if (ret < 0)
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return ret;
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}
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memcpy(dctx->key, key, keylen);
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return 0;
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}
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static void
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des3_128_encrypt(void *ctx, u8 *dst, const u8 *src)
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{
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struct crypt_z990_des3_128_ctx *dctx;
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dctx = ctx;
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crypt_z990_km(KM_TDEA_128_ENCRYPT, dctx->key, dst, (void*)src,
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DES3_128_BLOCK_SIZE);
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}
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static void
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des3_128_decrypt(void *ctx, u8 *dst, const u8 *src)
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{
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struct crypt_z990_des3_128_ctx *dctx;
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dctx = ctx;
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crypt_z990_km(KM_TDEA_128_DECRYPT, dctx->key, dst, (void*)src,
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DES3_128_BLOCK_SIZE);
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}
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static struct crypto_alg des3_128_alg = {
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.cra_name = "des3_ede128",
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.cra_flags = CRYPTO_ALG_TYPE_CIPHER,
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.cra_blocksize = DES3_128_BLOCK_SIZE,
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.cra_ctxsize = sizeof(struct crypt_z990_des3_128_ctx),
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.cra_module = THIS_MODULE,
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.cra_list = LIST_HEAD_INIT(des3_128_alg.cra_list),
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.cra_u = { .cipher = {
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.cia_min_keysize = DES3_128_KEY_SIZE,
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.cia_max_keysize = DES3_128_KEY_SIZE,
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.cia_setkey = des3_128_setkey,
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.cia_encrypt = des3_128_encrypt,
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.cia_decrypt = des3_128_decrypt } }
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};
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/*
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* RFC2451:
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*
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* For DES-EDE3, there is no known need to reject weak or
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* complementation keys. Any weakness is obviated by the use of
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* multiple keys.
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*
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* However, if the first two or last two independent 64-bit keys are
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* equal (k1 == k2 or k2 == k3), then the DES3 operation is simply the
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* same as DES. Implementers MUST reject keys that exhibit this
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* property.
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*
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*/
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static int
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des3_192_setkey(void *ctx, const u8 *key, unsigned int keylen, u32 *flags)
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{
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int i, ret;
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struct crypt_z990_des3_192_ctx *dctx;
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const u8* temp_key;
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dctx = ctx;
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temp_key = key;
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if (!(memcmp(key, &key[DES_KEY_SIZE], DES_KEY_SIZE) &&
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memcmp(&key[DES_KEY_SIZE], &key[DES_KEY_SIZE * 2],
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DES_KEY_SIZE))) {
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*flags |= CRYPTO_TFM_RES_BAD_KEY_SCHED;
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return -EINVAL;
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}
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for (i = 0; i < 3; i++, temp_key += DES_KEY_SIZE) {
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ret = crypto_des_check_key(temp_key, DES_KEY_SIZE, flags);
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if (ret < 0){
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return ret;
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}
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}
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memcpy(dctx->key, key, keylen);
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return 0;
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}
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static void
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des3_192_encrypt(void *ctx, u8 *dst, const u8 *src)
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{
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struct crypt_z990_des3_192_ctx *dctx;
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dctx = ctx;
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crypt_z990_km(KM_TDEA_192_ENCRYPT, dctx->key, dst, (void*)src,
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DES3_192_BLOCK_SIZE);
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}
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static void
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des3_192_decrypt(void *ctx, u8 *dst, const u8 *src)
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{
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struct crypt_z990_des3_192_ctx *dctx;
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dctx = ctx;
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crypt_z990_km(KM_TDEA_192_DECRYPT, dctx->key, dst, (void*)src,
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DES3_192_BLOCK_SIZE);
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}
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static struct crypto_alg des3_192_alg = {
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.cra_name = "des3_ede",
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.cra_flags = CRYPTO_ALG_TYPE_CIPHER,
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.cra_blocksize = DES3_192_BLOCK_SIZE,
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.cra_ctxsize = sizeof(struct crypt_z990_des3_192_ctx),
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.cra_module = THIS_MODULE,
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.cra_list = LIST_HEAD_INIT(des3_192_alg.cra_list),
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.cra_u = { .cipher = {
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.cia_min_keysize = DES3_192_KEY_SIZE,
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.cia_max_keysize = DES3_192_KEY_SIZE,
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.cia_setkey = des3_192_setkey,
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.cia_encrypt = des3_192_encrypt,
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.cia_decrypt = des3_192_decrypt } }
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};
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static int
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init(void)
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{
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int ret;
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if (!crypt_z990_func_available(KM_DEA_ENCRYPT) ||
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!crypt_z990_func_available(KM_TDEA_128_ENCRYPT) ||
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!crypt_z990_func_available(KM_TDEA_192_ENCRYPT)){
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return -ENOSYS;
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}
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ret = 0;
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ret |= (crypto_register_alg(&des_alg) == 0)? 0:1;
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ret |= (crypto_register_alg(&des3_128_alg) == 0)? 0:2;
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ret |= (crypto_register_alg(&des3_192_alg) == 0)? 0:4;
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if (ret){
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crypto_unregister_alg(&des3_192_alg);
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crypto_unregister_alg(&des3_128_alg);
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crypto_unregister_alg(&des_alg);
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return -EEXIST;
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}
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printk(KERN_INFO "crypt_z990: des_z990 loaded.\n");
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return 0;
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}
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static void __exit
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fini(void)
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{
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crypto_unregister_alg(&des3_192_alg);
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crypto_unregister_alg(&des3_128_alg);
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crypto_unregister_alg(&des_alg);
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}
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module_init(init);
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module_exit(fini);
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MODULE_ALIAS("des");
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MODULE_ALIAS("des3_ede");
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("DES & Triple DES EDE Cipher Algorithms");
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