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Fixed: overflow when converting WORD to BYTE #22

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Fixed: overflow when converting WORD to BYTE #22

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32 changes: 16 additions & 16 deletions aes.c
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Original file line number Diff line number Diff line change
Expand Up @@ -595,37 +595,37 @@ void AddRoundKey(BYTE state[][4], const WORD w[])

// memcpy(subkey,&w[idx],4); // Not accurate for big endian machines
// Subkey 1
subkey[0] = w[0] >> 24;
subkey[1] = w[0] >> 16;
subkey[2] = w[0] >> 8;
subkey[3] = w[0];
subkey[0] = ((w[0] >> 24) & 0xFF);
subkey[1] = ((w[0] >> 16) & 0xFF);
subkey[2] = ((w[0] >> 8) & 0xFF);
subkey[3] = ((w[0]) & 0xFF);
state[0][0] ^= subkey[0];
state[1][0] ^= subkey[1];
state[2][0] ^= subkey[2];
state[3][0] ^= subkey[3];
// Subkey 2
subkey[0] = w[1] >> 24;
subkey[1] = w[1] >> 16;
subkey[2] = w[1] >> 8;
subkey[3] = w[1];
subkey[0] = ((w[1] >> 24) & 0xFF);
subkey[1] = ((w[1] >> 16) & 0xFF);
subkey[2] = ((w[1] >> 8) & 0xFF);
subkey[3] = ((w[1]) & 0xFF);
state[0][1] ^= subkey[0];
state[1][1] ^= subkey[1];
state[2][1] ^= subkey[2];
state[3][1] ^= subkey[3];
// Subkey 3
subkey[0] = w[2] >> 24;
subkey[1] = w[2] >> 16;
subkey[2] = w[2] >> 8;
subkey[3] = w[2];
subkey[0] = ((w[2] >> 24) & 0xFF);
subkey[1] = ((w[2] >> 16) & 0xFF);
subkey[2] = ((w[2] >> 8) & 0xFF);
subkey[3] = ((w[2]) & 0xFF);
state[0][2] ^= subkey[0];
state[1][2] ^= subkey[1];
state[2][2] ^= subkey[2];
state[3][2] ^= subkey[3];
// Subkey 4
subkey[0] = w[3] >> 24;
subkey[1] = w[3] >> 16;
subkey[2] = w[3] >> 8;
subkey[3] = w[3];
subkey[0] = ((w[3] >> 24) & 0xFF);
subkey[1] = ((w[3] >> 16) & 0xFF);
subkey[2] = ((w[3] >> 8) & 0xFF);
subkey[3] = ((w[3]) & 0xFF);
state[0][3] ^= subkey[0];
state[1][3] ^= subkey[1];
state[2][3] ^= subkey[2];
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