PKCS1_MGF1
if (PKCS1_MGF1(dbmask, dbmask_len, seed, mdlen, mgf1md) < 0)
if (PKCS1_MGF1(seedmask, mdlen, db, dbmask_len, mgf1md) < 0)
if (PKCS1_MGF1(seed, mdlen, maskeddb, dblen, mgf1md))
if (PKCS1_MGF1(db, dblen, seed, mdlen, mgf1md))
if (PKCS1_MGF1(DB, maskedDBLen, H, hLen, mgf1Hash) < 0)
if (PKCS1_MGF1(EM, maskedDBLen, H, hLen, mgf1Hash))
int PKCS1_MGF1(unsigned char *mask, long len,