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-rw-r--r--arch/s390/crypto/des_z990.c284
1 files changed, 284 insertions, 0 deletions
diff --git a/arch/s390/crypto/des_z990.c b/arch/s390/crypto/des_z990.c
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index 00000000000..813cf37b117
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+++ b/arch/s390/crypto/des_z990.c
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+/*
+ * Cryptographic API.
+ *
+ * z990 implementation of the DES Cipher Algorithm.
+ *
+ * Copyright (c) 2003 IBM Deutschland Entwicklung GmbH, IBM Corporation
+ * Author(s): Thomas Spatzier (tspat@de.ibm.com)
+ *
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ */
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/mm.h>
+#include <linux/errno.h>
+#include <asm/scatterlist.h>
+#include <linux/crypto.h>
+#include "crypt_z990.h"
+#include "crypto_des.h"
+
+#define DES_BLOCK_SIZE 8
+#define DES_KEY_SIZE 8
+
+#define DES3_128_KEY_SIZE (2 * DES_KEY_SIZE)
+#define DES3_128_BLOCK_SIZE DES_BLOCK_SIZE
+
+#define DES3_192_KEY_SIZE (3 * DES_KEY_SIZE)
+#define DES3_192_BLOCK_SIZE DES_BLOCK_SIZE
+
+struct crypt_z990_des_ctx {
+ u8 iv[DES_BLOCK_SIZE];
+ u8 key[DES_KEY_SIZE];
+};
+
+struct crypt_z990_des3_128_ctx {
+ u8 iv[DES_BLOCK_SIZE];
+ u8 key[DES3_128_KEY_SIZE];
+};
+
+struct crypt_z990_des3_192_ctx {
+ u8 iv[DES_BLOCK_SIZE];
+ u8 key[DES3_192_KEY_SIZE];
+};
+
+static int
+des_setkey(void *ctx, const u8 *key, unsigned int keylen, u32 *flags)
+{
+ struct crypt_z990_des_ctx *dctx;
+ int ret;
+
+ dctx = ctx;
+ //test if key is valid (not a weak key)
+ ret = crypto_des_check_key(key, keylen, flags);
+ if (ret == 0){
+ memcpy(dctx->key, key, keylen);
+ }
+ return ret;
+}
+
+
+static void
+des_encrypt(void *ctx, u8 *dst, const u8 *src)
+{
+ struct crypt_z990_des_ctx *dctx;
+
+ dctx = ctx;
+ crypt_z990_km(KM_DEA_ENCRYPT, dctx->key, dst, src, DES_BLOCK_SIZE);
+}
+
+static void
+des_decrypt(void *ctx, u8 *dst, const u8 *src)
+{
+ struct crypt_z990_des_ctx *dctx;
+
+ dctx = ctx;
+ crypt_z990_km(KM_DEA_DECRYPT, dctx->key, dst, src, DES_BLOCK_SIZE);
+}
+
+static struct crypto_alg des_alg = {
+ .cra_name = "des",
+ .cra_flags = CRYPTO_ALG_TYPE_CIPHER,
+ .cra_blocksize = DES_BLOCK_SIZE,
+ .cra_ctxsize = sizeof(struct crypt_z990_des_ctx),
+ .cra_module = THIS_MODULE,
+ .cra_list = LIST_HEAD_INIT(des_alg.cra_list),
+ .cra_u = { .cipher = {
+ .cia_min_keysize = DES_KEY_SIZE,
+ .cia_max_keysize = DES_KEY_SIZE,
+ .cia_setkey = des_setkey,
+ .cia_encrypt = des_encrypt,
+ .cia_decrypt = des_decrypt } }
+};
+
+/*
+ * RFC2451:
+ *
+ * For DES-EDE3, there is no known need to reject weak or
+ * complementation keys. Any weakness is obviated by the use of
+ * multiple keys.
+ *
+ * However, if the two independent 64-bit keys are equal,
+ * then the DES3 operation is simply the same as DES.
+ * Implementers MUST reject keys that exhibit this property.
+ *
+ */
+static int
+des3_128_setkey(void *ctx, const u8 *key, unsigned int keylen, u32 *flags)
+{
+ int i, ret;
+ struct crypt_z990_des3_128_ctx *dctx;
+ const u8* temp_key = key;
+
+ dctx = ctx;
+ if (!(memcmp(key, &key[DES_KEY_SIZE], DES_KEY_SIZE))) {
+
+ *flags |= CRYPTO_TFM_RES_BAD_KEY_SCHED;
+ return -EINVAL;
+ }
+ for (i = 0; i < 2; i++, temp_key += DES_KEY_SIZE) {
+ ret = crypto_des_check_key(temp_key, DES_KEY_SIZE, flags);
+ if (ret < 0)
+ return ret;
+ }
+ memcpy(dctx->key, key, keylen);
+ return 0;
+}
+
+static void
+des3_128_encrypt(void *ctx, u8 *dst, const u8 *src)
+{
+ struct crypt_z990_des3_128_ctx *dctx;
+
+ dctx = ctx;
+ crypt_z990_km(KM_TDEA_128_ENCRYPT, dctx->key, dst, (void*)src,
+ DES3_128_BLOCK_SIZE);
+}
+
+static void
+des3_128_decrypt(void *ctx, u8 *dst, const u8 *src)
+{
+ struct crypt_z990_des3_128_ctx *dctx;
+
+ dctx = ctx;
+ crypt_z990_km(KM_TDEA_128_DECRYPT, dctx->key, dst, (void*)src,
+ DES3_128_BLOCK_SIZE);
+}
+
+static struct crypto_alg des3_128_alg = {
+ .cra_name = "des3_ede128",
+ .cra_flags = CRYPTO_ALG_TYPE_CIPHER,
+ .cra_blocksize = DES3_128_BLOCK_SIZE,
+ .cra_ctxsize = sizeof(struct crypt_z990_des3_128_ctx),
+ .cra_module = THIS_MODULE,
+ .cra_list = LIST_HEAD_INIT(des3_128_alg.cra_list),
+ .cra_u = { .cipher = {
+ .cia_min_keysize = DES3_128_KEY_SIZE,
+ .cia_max_keysize = DES3_128_KEY_SIZE,
+ .cia_setkey = des3_128_setkey,
+ .cia_encrypt = des3_128_encrypt,
+ .cia_decrypt = des3_128_decrypt } }
+};
+
+/*
+ * RFC2451:
+ *
+ * For DES-EDE3, there is no known need to reject weak or
+ * complementation keys. Any weakness is obviated by the use of
+ * multiple keys.
+ *
+ * However, if the first two or last two independent 64-bit keys are
+ * equal (k1 == k2 or k2 == k3), then the DES3 operation is simply the
+ * same as DES. Implementers MUST reject keys that exhibit this
+ * property.
+ *
+ */
+static int
+des3_192_setkey(void *ctx, const u8 *key, unsigned int keylen, u32 *flags)
+{
+ int i, ret;
+ struct crypt_z990_des3_192_ctx *dctx;
+ const u8* temp_key;
+
+ dctx = ctx;
+ temp_key = key;
+ if (!(memcmp(key, &key[DES_KEY_SIZE], DES_KEY_SIZE) &&
+ memcmp(&key[DES_KEY_SIZE], &key[DES_KEY_SIZE * 2],
+ DES_KEY_SIZE))) {
+
+ *flags |= CRYPTO_TFM_RES_BAD_KEY_SCHED;
+ return -EINVAL;
+ }
+ for (i = 0; i < 3; i++, temp_key += DES_KEY_SIZE) {
+ ret = crypto_des_check_key(temp_key, DES_KEY_SIZE, flags);
+ if (ret < 0){
+ return ret;
+ }
+ }
+ memcpy(dctx->key, key, keylen);
+ return 0;
+}
+
+static void
+des3_192_encrypt(void *ctx, u8 *dst, const u8 *src)
+{
+ struct crypt_z990_des3_192_ctx *dctx;
+
+ dctx = ctx;
+ crypt_z990_km(KM_TDEA_192_ENCRYPT, dctx->key, dst, (void*)src,
+ DES3_192_BLOCK_SIZE);
+}
+
+static void
+des3_192_decrypt(void *ctx, u8 *dst, const u8 *src)
+{
+ struct crypt_z990_des3_192_ctx *dctx;
+
+ dctx = ctx;
+ crypt_z990_km(KM_TDEA_192_DECRYPT, dctx->key, dst, (void*)src,
+ DES3_192_BLOCK_SIZE);
+}
+
+static struct crypto_alg des3_192_alg = {
+ .cra_name = "des3_ede",
+ .cra_flags = CRYPTO_ALG_TYPE_CIPHER,
+ .cra_blocksize = DES3_192_BLOCK_SIZE,
+ .cra_ctxsize = sizeof(struct crypt_z990_des3_192_ctx),
+ .cra_module = THIS_MODULE,
+ .cra_list = LIST_HEAD_INIT(des3_192_alg.cra_list),
+ .cra_u = { .cipher = {
+ .cia_min_keysize = DES3_192_KEY_SIZE,
+ .cia_max_keysize = DES3_192_KEY_SIZE,
+ .cia_setkey = des3_192_setkey,
+ .cia_encrypt = des3_192_encrypt,
+ .cia_decrypt = des3_192_decrypt } }
+};
+
+
+
+static int
+init(void)
+{
+ int ret;
+
+ if (!crypt_z990_func_available(KM_DEA_ENCRYPT) ||
+ !crypt_z990_func_available(KM_TDEA_128_ENCRYPT) ||
+ !crypt_z990_func_available(KM_TDEA_192_ENCRYPT)){
+ return -ENOSYS;
+ }
+
+ ret = 0;
+ ret |= (crypto_register_alg(&des_alg) == 0)? 0:1;
+ ret |= (crypto_register_alg(&des3_128_alg) == 0)? 0:2;
+ ret |= (crypto_register_alg(&des3_192_alg) == 0)? 0:4;
+ if (ret){
+ crypto_unregister_alg(&des3_192_alg);
+ crypto_unregister_alg(&des3_128_alg);
+ crypto_unregister_alg(&des_alg);
+ return -EEXIST;
+ }
+
+ printk(KERN_INFO "crypt_z990: des_z990 loaded.\n");
+ return 0;
+}
+
+static void __exit
+fini(void)
+{
+ crypto_unregister_alg(&des3_192_alg);
+ crypto_unregister_alg(&des3_128_alg);
+ crypto_unregister_alg(&des_alg);
+}
+
+module_init(init);
+module_exit(fini);
+
+MODULE_ALIAS("des");
+MODULE_ALIAS("des3_ede");
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("DES & Triple DES EDE Cipher Algorithms");
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