DES_EXPKEY_WORDS
#define DES3_EDE_EXPKEY_WORDS (3 * DES_EXPKEY_WORDS)
u32 expkey[DES_EXPKEY_WORDS];
const u32 *K = ctx->expkey + DES_EXPKEY_WORDS - 2;
des_ekey(pe, key); pe += DES_EXPKEY_WORDS; key += DES_KEY_SIZE;
dkey(pe, key); pe += DES_EXPKEY_WORDS; key += DES_KEY_SIZE;