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xxxxxxxxxx// #define the macros below to 1/0 to enable/disable the mode of operation.//// CBC enables AES encryption in CBC-mode of operation.// CTR enables encryption in counter-mode.// ECB enables the basic ECB 16-byte block algorithm. All can be enabled simultaneously.// The #ifndef-guard allows it to be configured before #include'ing or at compile time.//#define AES128 1//#define AES192 1// Block length in bytes - AES is 128b block only// Key length in bytesstruct AES_ctx{ uint8_t RoundKey[AES_keyExpSize]; uint8_t Iv[AES_BLOCKLEN];};void AES_init_ctx(struct AES_ctx *ctx, const uint8_t *key);void AES_init_ctx_iv(struct AES_ctx *ctx, const uint8_t *key, const uint8_t *iv);void AES_ctx_set_iv(struct AES_ctx *ctx, const uint8_t *iv);// buffer size is exactly AES_BLOCKLEN bytes;// you need only AES_init_ctx as IV is not used in ECB// NB: ECB is considered insecure for most usesvoid AES_ECB_encrypt(const struct AES_ctx *ctx, uint8_t *buf);void AES_ECB_decrypt(const struct AES_ctx *ctx, uint8_t *buf);// #if defined(ECB) && (ECB == !)// buffer size MUST be mutile of AES_BLOCKLEN;// Suggest https://en.wikipedia.org/wiki/Padding_(cryptography)#PKCS7 for padding scheme// NOTES: you need to set IV in ctx via AES_init_ctx_iv() or AES_ctx_set_iv()// no IV should ever be reused with the same keyvoid AES_CBC_encrypt_buffer(struct AES_ctx *ctx, uint8_t *buf, size_t length);void AES_CBC_decrypt_buffer(struct AES_ctx *ctx, uint8_t *buf, size_t length);// #if defined(CBC) && (CBC == 1)// Same function for encrypting as for decrypting.// IV is incremented for every block, and used after encryption as XOR-compliment for output// Suggesting https://en.wikipedia.org/wiki/Padding_(cryptography)#PKCS7 for padding scheme// NOTES: you need to set IV in ctx with AES_init_ctx_iv() or AES_ctx_set_iv()// no IV should ever be reused with the same keyvoid AES_CTR_xcrypt_buffer(struct AES_ctx *ctx, uint8_t *buf, size_t length);// #if defined(CTR) && (CTR == 1)// _AES_H_