The RSAPUBKEY structure contains information specific to the particular public key contained in the key blob.
typedef struct _RSAPUBKEY {
DWORD magic;
DWORD bitlen;
DWORD pubexp;
} RSAPUBKEY;
Notice that the hex values are just an ASCII encoding of "RSA1" and "RSA2."
BLOBHEADER, DSSPUBKEY, DSSSEED