INNER CODE UNIT · C

F

dmitrystu/sboot_stm32 · src/blowfish.c:33

static uint32_t F(uint32_t x) {
    uint32_t h = D.S[0][x >> 24] + D.S[1][(x >> 16) & 0xFF];
    return (h ^ D.S[2][(x >> 8) & 0xFF]) + D.S[3][x & 0xFF];
}

void blowfish_encrypt(uint32_t *out, const uint32_t *in){
    uint32_t L = in[0];
    uint32_t R = in[1];
    for (int i = 0; i < rounds; i+=2) {
        L ^= D.P[i];
        R ^= F(L);
        R ^= D.P[i+1];
        L ^= F(R);
    }
    L ^= D.P[16];
    R ^= D.P[17];
    out[0] = R;
    out[1] = L;

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