141 lines
3.4 KiB
C
141 lines
3.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Cryptographic API.
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*
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* DES & Triple DES EDE Cipher Algorithms.
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*
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* Copyright (c) 2005 Dag Arne Osvik <da@osvik.no>
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*/
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#include <asm/byteorder.h>
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#include <linux/bitops.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/errno.h>
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#include <linux/crypto.h>
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#include <crypto/internal/des.h>
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static int des_setkey(struct crypto_tfm *tfm, const u8 *key,
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unsigned int keylen)
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{
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struct des_ctx *dctx = crypto_tfm_ctx(tfm);
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int err;
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err = des_expand_key(dctx, key, keylen);
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if (err == -ENOKEY) {
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if (crypto_tfm_get_flags(tfm) & CRYPTO_TFM_REQ_FORBID_WEAK_KEYS)
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err = -EINVAL;
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else
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err = 0;
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}
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if (err) {
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memset(dctx, 0, sizeof(*dctx));
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crypto_tfm_set_flags(tfm, CRYPTO_TFM_RES_WEAK_KEY);
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}
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return err;
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}
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static void crypto_des_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
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{
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const struct des_ctx *dctx = crypto_tfm_ctx(tfm);
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des_encrypt(dctx, dst, src);
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}
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static void crypto_des_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
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{
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const struct des_ctx *dctx = crypto_tfm_ctx(tfm);
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des_decrypt(dctx, dst, src);
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}
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static int des3_ede_setkey(struct crypto_tfm *tfm, const u8 *key,
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unsigned int keylen)
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{
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struct des3_ede_ctx *dctx = crypto_tfm_ctx(tfm);
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int err;
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err = des3_ede_expand_key(dctx, key, keylen);
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if (err == -ENOKEY) {
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if (crypto_tfm_get_flags(tfm) & CRYPTO_TFM_REQ_FORBID_WEAK_KEYS)
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err = -EINVAL;
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else
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err = 0;
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}
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if (err) {
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memset(dctx, 0, sizeof(*dctx));
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crypto_tfm_set_flags(tfm, CRYPTO_TFM_RES_WEAK_KEY);
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}
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return err;
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}
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static void crypto_des3_ede_encrypt(struct crypto_tfm *tfm, u8 *dst,
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const u8 *src)
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{
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const struct des3_ede_ctx *dctx = crypto_tfm_ctx(tfm);
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des3_ede_encrypt(dctx, dst, src);
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}
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static void crypto_des3_ede_decrypt(struct crypto_tfm *tfm, u8 *dst,
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const u8 *src)
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{
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const struct des3_ede_ctx *dctx = crypto_tfm_ctx(tfm);
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des3_ede_decrypt(dctx, dst, src);
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}
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static struct crypto_alg des_algs[2] = { {
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.cra_name = "des",
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.cra_driver_name = "des-generic",
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.cra_priority = 100,
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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 des_ctx),
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.cra_module = THIS_MODULE,
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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 = crypto_des_encrypt,
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.cia_decrypt = crypto_des_decrypt } }
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}, {
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.cra_name = "des3_ede",
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.cra_driver_name = "des3_ede-generic",
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.cra_priority = 100,
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.cra_flags = CRYPTO_ALG_TYPE_CIPHER,
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.cra_blocksize = DES3_EDE_BLOCK_SIZE,
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.cra_ctxsize = sizeof(struct des3_ede_ctx),
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.cra_module = THIS_MODULE,
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.cra_u = { .cipher = {
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.cia_min_keysize = DES3_EDE_KEY_SIZE,
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.cia_max_keysize = DES3_EDE_KEY_SIZE,
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.cia_setkey = des3_ede_setkey,
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.cia_encrypt = crypto_des3_ede_encrypt,
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.cia_decrypt = crypto_des3_ede_decrypt } }
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} };
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static int __init des_generic_mod_init(void)
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{
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return crypto_register_algs(des_algs, ARRAY_SIZE(des_algs));
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}
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static void __exit des_generic_mod_fini(void)
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{
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crypto_unregister_algs(des_algs, ARRAY_SIZE(des_algs));
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}
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subsys_initcall(des_generic_mod_init);
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module_exit(des_generic_mod_fini);
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("DES & Triple DES EDE Cipher Algorithms");
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MODULE_AUTHOR("Dag Arne Osvik <da@osvik.no>");
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MODULE_ALIAS_CRYPTO("des");
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MODULE_ALIAS_CRYPTO("des-generic");
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MODULE_ALIAS_CRYPTO("des3_ede");
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MODULE_ALIAS_CRYPTO("des3_ede-generic");
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