void
blf_decrypt(struct keystate *ks, u_int8_t *data, u_int16_t len)
{
u_int16_t i, blocksize = ks->xf->blocksize;
u_int32_t xl, xr;
data += len - blocksize;
for (i = len - blocksize; i >= blocksize; data -= blocksize,
i -= blocksize) {
xl = GET_32BIT_BIG(data);
xr = GET_32BIT_BIG(data + 4);
Blowfish_decipher(&ks->ks_blf, &xl, &xr);
SET_32BIT_BIG(data, xl);
SET_32BIT_BIG(data + 4, xr);
XOR64(data, data - blocksize);
}
xl = GET_32BIT_BIG(data);
xr = GET_32BIT_BIG(data + 4);
Blowfish_decipher(&ks->ks_blf, &xl, &xr);
SET_32BIT_BIG(data, xl);
SET_32BIT_BIG(data + 4, xr);
XOR64(data, ks->riv);
}
static inline void g64(uint64_t *a, uint64_t *b, uint64_t *c, uint64_t *d, uint32_t round, uint32_t i, uint64_t m[16]) {
*a = ADD64((*a),(*b))+XOR64(m[sigma[round%10][2*i]], c512[sigma[round%10][2*i+1]]);
*d = ROT64(XOR64((*d),(*a)),32);
*c = ADD64((*c),(*d));
*b = ROT64(XOR64((*b),(*c)),25);
*a = ADD64((*a),(*b))+XOR64(m[sigma[round%10][2*i+1]], c512[sigma[round%10][2*i]]);
*d = ROT64(XOR64((*d),(*a)),16);
*c = ADD64((*c),(*d));
*b = ROT64(XOR64((*b),(*c)),11);
}
void
blf_encrypt(struct keystate *ks, u_int8_t *data, u_int16_t len)
{
u_int16_t i, blocksize = ks->xf->blocksize;
u_int8_t *iv = ks->liv;
u_int32_t xl, xr;
memcpy(iv, ks->riv, blocksize);
for (i = 0; i < len; data += blocksize, i += blocksize) {
XOR64(data, iv);
xl = GET_32BIT_BIG(data);
xr = GET_32BIT_BIG(data + 4);
Blowfish_encipher(&ks->ks_blf, &xl, &xr);
SET_32BIT_BIG(data, xl);
SET_32BIT_BIG(data + 4, xr);
SET64(iv, data);
}
}
