aes.h

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#ifndef _AES_H_
#define _AES_H_
 
#include <stdint.h>
 
// #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.
#ifndef CBC
    #define CBC 1
#endif
 
#ifndef ECB
    #define ECB 1
#endif
 
#ifndef CTR
    #define CTR 1
#endif
 
 
#define AES128 1
//#define AES192 1
//#define AES256 1
 
#define AES_BLOCKLEN 16 // Block length in bytes - AES is 128b block only
 
#if defined(AES256) && (AES256 == 1)
    #define AES_KEYLEN 32
    #define AES_keyExpSize 240
#elif defined(AES192) && (AES192 == 1)
    #define AES_KEYLEN 24
    #define AES_keyExpSize 208
#else
    #define AES_KEYLEN 16   // Key length in bytes
    #define AES_keyExpSize 176
#endif
 
struct AES_ctx
{
    uint8_t RoundKey[AES_keyExpSize];
#if (defined(CBC) && (CBC == 1)) || (defined(CTR) && (CTR == 1))
    uint8_t Iv[AES_BLOCKLEN];
#endif
};
 
void AES_init_ctx(struct AES_ctx* ctx, const uint8_t* key);
#if (defined(CBC) && (CBC == 1)) || (defined(CTR) && (CTR == 1))
    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);
#endif
 
#if defined(ECB) && (ECB == 1)
    // 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 uses
    void AES_ECB_encrypt(const struct AES_ctx* ctx, uint8_t* buf);
    void AES_ECB_decrypt(const struct AES_ctx* ctx, uint8_t* buf);
 
#endif // #if defined(ECB) && (ECB == !)
 
 
#if defined(CBC) && (CBC == 1)
    // 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 key
    void AES_CBC_encrypt_buffer(struct AES_ctx* ctx, uint8_t* buf, uint32_t length);
    void AES_CBC_decrypt_buffer(struct AES_ctx* ctx, uint8_t* buf, uint32_t length);
 
#endif // #if defined(CBC) && (CBC == 1)
 
 
#if defined(CTR) && (CTR == 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 key
    void AES_CTR_xcrypt_buffer(struct AES_ctx* ctx, uint8_t* buf, uint32_t length);
 
#endif // #if defined(CTR) && (CTR == 1)
 
 
#endif // _AES_H_