1 /* 2 * Copyright (C) 2021 - This file is part of libecc project 3 * 4 * Authors: 5 * Ryad BENADJILA <ryadbenadjila@gmail.com> 6 * Arnaud EBALARD <arnaud.ebalard@ssi.gouv.fr> 7 * 8 * This software is licensed under a dual BSD and GPL v2 license. 9 * See LICENSE file at the root folder of the project. 10 */ 11 12 #ifndef __TDES_H__ 13 #define __TDES_H__ 14 15 /* Include libec for useful types and macros */ 16 #include <libecc/libec.h> 17 18 typedef enum { 19 DES_ENCRYPTION = 0, 20 DES_DECRYPTION = 1, 21 } des_direction; 22 23 /* DES context */ 24 typedef struct { 25 des_direction dir; 26 u64 sk[16]; /* encryption/decryption subkeys */ 27 } des_context; 28 29 /* Triple DES context */ 30 typedef struct { 31 des_direction dir; 32 des_context des[3]; 33 } des3_context; 34 35 /* Odd parity table */ 36 static const u8 odd_parity[256] = { 37 1, 1, 2, 2, 4, 4, 7, 7, 8, 8, 11, 11, 13, 13, 14, 14, 38 16, 16, 19, 19, 21, 21, 22, 22, 25, 25, 26, 26, 28, 28, 31, 31, 39 32, 32, 35, 35, 37, 37, 38, 38, 41, 41, 42, 42, 44, 44, 47, 47, 40 49, 49, 50, 50, 52, 52, 55, 55, 56, 56, 59, 59, 61, 61, 62, 62, 41 64, 64, 67, 67, 69, 69, 70, 70, 73, 73, 74, 74, 76, 76, 79, 79, 42 81, 81, 82, 82, 84, 84, 87, 87, 88, 88, 91, 91, 93, 93, 94, 94, 43 97, 97, 98, 98, 100, 100, 103, 103, 104, 104, 107, 107, 109, 109, 110, 44 110, 45 112, 112, 115, 115, 117, 117, 118, 118, 121, 121, 122, 122, 124, 124, 127, 46 127, 47 128, 128, 131, 131, 133, 133, 134, 134, 137, 137, 138, 138, 140, 140, 143, 48 143, 49 145, 145, 146, 146, 148, 148, 151, 151, 152, 152, 155, 155, 157, 157, 158, 50 158, 51 161, 161, 162, 162, 164, 164, 167, 167, 168, 168, 171, 171, 173, 173, 174, 52 174, 53 176, 176, 179, 179, 181, 181, 182, 182, 185, 185, 186, 186, 188, 188, 191, 54 191, 55 193, 193, 194, 194, 196, 196, 199, 199, 200, 200, 203, 203, 205, 205, 206, 56 206, 57 208, 208, 211, 211, 213, 213, 214, 214, 217, 217, 218, 218, 220, 220, 223, 58 223, 59 224, 224, 227, 227, 229, 229, 230, 230, 233, 233, 234, 234, 236, 236, 239, 60 239, 61 241, 241, 242, 242, 244, 244, 247, 247, 248, 248, 251, 251, 253, 253, 254, 62 254 63 }; 64 65 /* DES key schedule */ 66 ATTRIBUTE_WARN_UNUSED_RET int des_set_key(des_context *ctx, const u8 k[8], des_direction dir); 67 68 /* DES encryption/decryption */ 69 ATTRIBUTE_WARN_UNUSED_RET int des(const des_context *ctx, const u8 input[8], u8 output[8]); 70 71 /* TDES key schedules */ 72 ATTRIBUTE_WARN_UNUSED_RET int des3_set_keys(des3_context *ctx, const u8 k1[8], const u8 k2[8], const u8 k3[8], des_direction dir); 73 74 /* TDES encryption/decryption */ 75 ATTRIBUTE_WARN_UNUSED_RET int des3(const des3_context *ctx, const u8 input[8], u8 output[8]); 76 77 #endif /* __TDES_H__ */ 78