| 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
| 2 | /* |
| 3 | * Cryptographic API. |
| 4 | * |
| 5 | * DES & Triple DES EDE Cipher Algorithms. |
| 6 | * |
| 7 | * Copyright (c) 2005 Dag Arne Osvik <da@osvik.no> |
| 8 | */ |
| 9 | |
| 10 | #include <asm/byteorder.h> |
| 11 | #include <crypto/algapi.h> |
| 12 | #include <linux/bitops.h> |
| 13 | #include <linux/init.h> |
| 14 | #include <linux/module.h> |
| 15 | #include <linux/errno.h> |
| 16 | |
| 17 | #include <crypto/internal/des.h> |
| 18 | |
| 19 | static int des_setkey(struct crypto_tfm *tfm, const u8 *key, |
| 20 | unsigned int keylen) |
| 21 | { |
| 22 | struct des_ctx *dctx = crypto_tfm_ctx(tfm); |
| 23 | int err; |
| 24 | |
| 25 | err = des_expand_key(dctx, key, keylen); |
| 26 | if (err == -ENOKEY) { |
| 27 | if (crypto_tfm_get_flags(tfm) & CRYPTO_TFM_REQ_FORBID_WEAK_KEYS) |
| 28 | err = -EINVAL; |
| 29 | else |
| 30 | err = 0; |
| 31 | } |
| 32 | if (err) |
| 33 | memset(dctx, 0, sizeof(*dctx)); |
| 34 | return err; |
| 35 | } |
| 36 | |
| 37 | static void crypto_des_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src) |
| 38 | { |
| 39 | const struct des_ctx *dctx = crypto_tfm_ctx(tfm); |
| 40 | |
| 41 | des_encrypt(dctx, dst, src); |
| 42 | } |
| 43 | |
| 44 | static void crypto_des_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src) |
| 45 | { |
| 46 | const struct des_ctx *dctx = crypto_tfm_ctx(tfm); |
| 47 | |
| 48 | des_decrypt(dctx, dst, src); |
| 49 | } |
| 50 | |
| 51 | static int des3_ede_setkey(struct crypto_tfm *tfm, const u8 *key, |
| 52 | unsigned int keylen) |
| 53 | { |
| 54 | struct des3_ede_ctx *dctx = crypto_tfm_ctx(tfm); |
| 55 | int err; |
| 56 | |
| 57 | err = des3_ede_expand_key(dctx, key, keylen); |
| 58 | if (err == -ENOKEY) { |
| 59 | if (crypto_tfm_get_flags(tfm) & CRYPTO_TFM_REQ_FORBID_WEAK_KEYS) |
| 60 | err = -EINVAL; |
| 61 | else |
| 62 | err = 0; |
| 63 | } |
| 64 | if (err) |
| 65 | memset(dctx, 0, sizeof(*dctx)); |
| 66 | return err; |
| 67 | } |
| 68 | |
| 69 | static void crypto_des3_ede_encrypt(struct crypto_tfm *tfm, u8 *dst, |
| 70 | const u8 *src) |
| 71 | { |
| 72 | const struct des3_ede_ctx *dctx = crypto_tfm_ctx(tfm); |
| 73 | |
| 74 | des3_ede_encrypt(dctx, dst, src); |
| 75 | } |
| 76 | |
| 77 | static void crypto_des3_ede_decrypt(struct crypto_tfm *tfm, u8 *dst, |
| 78 | const u8 *src) |
| 79 | { |
| 80 | const struct des3_ede_ctx *dctx = crypto_tfm_ctx(tfm); |
| 81 | |
| 82 | des3_ede_decrypt(dctx, dst, src); |
| 83 | } |
| 84 | |
| 85 | static struct crypto_alg des_algs[2] = { { |
| 86 | .cra_name = "des", |
| 87 | .cra_driver_name = "des-generic", |
| 88 | .cra_priority = 100, |
| 89 | .cra_flags = CRYPTO_ALG_TYPE_CIPHER, |
| 90 | .cra_blocksize = DES_BLOCK_SIZE, |
| 91 | .cra_ctxsize = sizeof(struct des_ctx), |
| 92 | .cra_module = THIS_MODULE, |
| 93 | .cra_u = { .cipher = { |
| 94 | .cia_min_keysize = DES_KEY_SIZE, |
| 95 | .cia_max_keysize = DES_KEY_SIZE, |
| 96 | .cia_setkey = des_setkey, |
| 97 | .cia_encrypt = crypto_des_encrypt, |
| 98 | .cia_decrypt = crypto_des_decrypt } } |
| 99 | }, { |
| 100 | .cra_name = "des3_ede", |
| 101 | .cra_driver_name = "des3_ede-generic", |
| 102 | .cra_priority = 100, |
| 103 | .cra_flags = CRYPTO_ALG_TYPE_CIPHER, |
| 104 | .cra_blocksize = DES3_EDE_BLOCK_SIZE, |
| 105 | .cra_ctxsize = sizeof(struct des3_ede_ctx), |
| 106 | .cra_module = THIS_MODULE, |
| 107 | .cra_u = { .cipher = { |
| 108 | .cia_min_keysize = DES3_EDE_KEY_SIZE, |
| 109 | .cia_max_keysize = DES3_EDE_KEY_SIZE, |
| 110 | .cia_setkey = des3_ede_setkey, |
| 111 | .cia_encrypt = crypto_des3_ede_encrypt, |
| 112 | .cia_decrypt = crypto_des3_ede_decrypt } } |
| 113 | } }; |
| 114 | |
| 115 | static int __init des_generic_mod_init(void) |
| 116 | { |
| 117 | return crypto_register_algs(des_algs, ARRAY_SIZE(des_algs)); |
| 118 | } |
| 119 | |
| 120 | static void __exit des_generic_mod_fini(void) |
| 121 | { |
| 122 | crypto_unregister_algs(des_algs, ARRAY_SIZE(des_algs)); |
| 123 | } |
| 124 | |
| 125 | subsys_initcall(des_generic_mod_init); |
| 126 | module_exit(des_generic_mod_fini); |
| 127 | |
| 128 | MODULE_LICENSE("GPL"); |
| 129 | MODULE_DESCRIPTION("DES & Triple DES EDE Cipher Algorithms"); |
| 130 | MODULE_AUTHOR("Dag Arne Osvik <da@osvik.no>"); |
| 131 | MODULE_ALIAS_CRYPTO("des"); |
| 132 | MODULE_ALIAS_CRYPTO("des-generic"); |
| 133 | MODULE_ALIAS_CRYPTO("des3_ede"); |
| 134 | MODULE_ALIAS_CRYPTO("des3_ede-generic"); |