1 /* 2 * Copyright (C) 2016 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef _NANOHUB_AES_H_ 18 #define _NANOHUB_AES_H_ 19 20 #include <stdint.h> 21 22 struct AesContext { 23 uint32_t K[64]; 24 }; 25 26 struct AesSetupTempWorksSpace { //unsed temporarily for aesInitForDecr() only, not used after, need not be live 27 struct AesContext tmpCtx; 28 }; 29 30 #define AES_KEY_WORDS 8 31 #define AES_BLOCK_WORDS 4 32 #define AES_BLOCK_SIZE 16 // in bytes 33 34 //basic AES block ops 35 void aesInitForEncr(struct AesContext *ctx, const uint32_t *k); 36 void aesInitForDecr(struct AesContext *ctx, struct AesSetupTempWorksSpace *tmpSpace, const uint32_t *k); 37 void aesEncr(struct AesContext *ctx, const uint32_t *src, uint32_t *dst); //encrypts AES_BLOCK_WORDS words 38 void aesDecr(struct AesContext *ctx, const uint32_t *src, uint32_t *dst); //deencrypts AES_BLOCK_WORDS words 39 40 //AES-CBC 41 struct AesCbcContext { 42 struct AesContext aes; 43 uint32_t iv[AES_BLOCK_WORDS]; 44 }; 45 46 void aesCbcInitForEncr(struct AesCbcContext *ctx, const uint32_t *k, const uint32_t *iv); 47 void aesCbcInitForDecr(struct AesCbcContext *ctx, const uint32_t *k, const uint32_t *iv); 48 void aesCbcEncr(struct AesCbcContext *ctx, const uint32_t *src, uint32_t *dst); //encrypts AES_BLOCK_WORDS words 49 void aesCbcDecr(struct AesCbcContext *ctx, const uint32_t *src, uint32_t *dst); //encrypts AES_BLOCK_WORDS words 50 51 52 53 54 #endif // _NANOHUB_AES_H_ 55 56