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#ifndef AE_COMMON_H
#define AE_COMMON_H
#include <stddef.h>
#include <stdint.h>
#include <string.h>
#include "cipher.h"
#include "parameters.h"
static inline uint8_t upper_nibble(uint8_t i)
{
return i >> 4;
}
static inline uint8_t lower_nibble(uint8_t i)
{
return i & 0x0f;
}
static inline void encrypt(const uint8_t K[KEY_BYTES],
const uint8_t T[TWEAK_BYTES],
const uint8_t M[BLOCK_BYTES],
uint8_t C[BLOCK_BYTES])
{
lilliput_tbc_encrypt(K, T, M, C);
}
static inline void decrypt(const uint8_t K[KEY_BYTES],
const uint8_t T[TWEAK_BYTES],
const uint8_t C[BLOCK_BYTES],
uint8_t M[BLOCK_BYTES])
{
lilliput_tbc_decrypt(K, T, C, M);
}
static inline void xor_into(uint8_t dest[BLOCK_BYTES], const uint8_t src[BLOCK_BYTES])
{
for (size_t i=0; i<BLOCK_BYTES; i++)
dest[i] ^= src[i];
}
static inline void xor_arrays(size_t len, uint8_t out[len], const uint8_t a[len], const uint8_t b[len])
{
for (size_t i=0; i<len; i++)
out[i] = a[i] ^ b[i];
}
static inline void pad10(size_t X_len, const uint8_t X[X_len], uint8_t padded[BLOCK_BYTES])
{
/* pad10*(X) = X || 1 || 0^{n-|X|-1} */
/* Assume that len<BLOCK_BYTES. */
size_t pad_len = BLOCK_BYTES-X_len;
memcpy(padded+pad_len, X, X_len);
padded[pad_len-1] = 0x80;
if (pad_len > 1)
{
memset(padded, 0, pad_len-1);
}
}
#endif /* AE_COMMON_H */
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