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Simplify key expansion

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This commit is contained in:
Manuel Thalmann 2023-11-14 08:58:09 +01:00
parent ea7b6b89de
commit 2be8b672cb
1 changed files with 1 additions and 3 deletions
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4
aes/aes.cpp
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@ -142,9 +142,7 @@ void mixColumns(t_state s) {
// Taken from: https://www.brainkart.com/article/AES-Key-Expansion_8410/ // Taken from: https://www.brainkart.com/article/AES-Key-Expansion_8410/
void expandKey(uint8_t k[16], uint32_t ek[44]) { void expandKey(uint8_t k[16], uint32_t ek[44]) {
for (uint8_t i = 0; i < 4; i++) { for (uint8_t i = 0; i < 4; i++) {
for (uint8_t j = 0; j < 4; j++) { ek[i] = word(k[i], k[i + 1], k[i + 2], k[i + 3]);
*(((uint8_t*)(&(ek[i]))) + j) = k[i * 4 + j];
}
} }
for (uint8_t i = 4; i < 44; i++) { for (uint8_t i = 4; i < 44; i++) {