50 lines
1.5 KiB
C
50 lines
1.5 KiB
C
#ifndef _AES_H_
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#define _AES_H_
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#include <stdint.h>
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// #define the macros below to 1/0 to enable/disable the mode of operation.
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//
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// CBC enables AES128 encryption in CBC-mode of operation and handles 0-padding.
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// ECB enables the basic ECB 16-byte block algorithm. Both can be enabled simultaneously.
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// The #ifndef-guard allows it to be configured before #include'ing or at compile time.
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#ifndef CBC
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#define CBC 1
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#endif
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#ifndef ECB
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#define ECB 1
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#endif
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#if defined(ECB) && ECB
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void AES128_ECB_encrypt(uint8_t* input, const uint8_t* key, uint8_t *output);
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void AES128_ECB_decrypt(uint8_t* input, const uint8_t* key, uint8_t *output);
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#endif // #if defined(ECB) && ECB
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#if defined(CBC) && CBC
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void AES128_CBC_encrypt_buffer(uint8_t* output, uint8_t* input, uint32_t length, const uint8_t* key, const uint8_t* iv);
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void AES128_CBC_decrypt_buffer(uint8_t* output, uint8_t* input, uint32_t length, const uint8_t* key, const uint8_t* iv);
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/* These variants encrypt and decrypt the data block in-place.
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* The data block length MUST be a multiple of the algorithm block size (16 bytes)
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* The return value will be non-zero if the length is incorrect.
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* For the decypt function, the iv data must be writable, and will be modified on return.
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*/
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uint8_t AES128_CBC_encrypt_inplace( uint8_t* data, size_t length, const uint8_t* key, const uint8_t* iv);
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uint8_t AES128_CBC_decrypt_inplace( uint8_t* data, size_t length, const uint8_t* key, uint8_t* iv);
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#endif // #if defined(CBC) && CBC
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#endif //_AES_H_
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