How to make a key out of this data?

Since no one replied to my last post, I'll give it another try. From an RTSP server I get two values, a key called rsaaeskey (342 bytes, without the line breaks):
yxKBocBgTii20n9nbKfYGyGhPqtosXuq8M99yU5/PzTVNmIUsUGlpD27u
cqN8eNFvmaO7cFVXeaMGaCfI5V+YNrd77xGQ+CUE0XFraXUvp4cF4aX1L
ZOGe38nwX3Ba+4bQFfjmYgz3ObRuOWlw9KCi4CMP5574F+CIvutVAwtAC
PiDFF7nVcoaBTr2QbSUile0Zs3Hyxjn9PWVaey9Nu2DgJZ8rtw6F2SkQ7
NDHBjjUKXNIeCAeBFuV4XNiazvi3gWa4VbgITtD9jcm+7nPMAK0oBL1S3
K3Z6FK7XVnfehYYJjRw7THMZzSvq7FtLB9QgulqQTJ3awJdwS0ACb1FkAand an initialization vector called aesiv (22 bytes):
zcZmAZtqh7uGcEwPXk0QeAThe data is obviously Base64 encoded. However, after decoding I don't know how to make a key out of it. Trying KeyFactory's generatePublic and generatePrivate methods result in an InvalidKeySpecException with any algorithm I've tried (RSA, DSA, DH).
I think this is a multi-prime RAS secret key (someone said they're 342 bytes long), but how do I generate a Java Key out of it?

The rsaaeskey, decoded to binary, is a binary array of 256 bytes. Using the DUMPASN1 tool we see that the bytes are not in ASN.1 BER or DER encoding.
C> openssl enc -base64 -d -in rsaaeskey.base64 -out test.bin
C> dumpasn1 rsaaeskey.bin
   0 CB   18: [PRIVATE 11]
            :   81 A1 C0 60 4E 28 B6 D2 7F 67 6C A7 D8 1B 21 A1
            :   3E ABIf it were encoded in ASN.1 BER or DER encoding it will start as a "SEQUENCE" or a "SET", not as an unrecognized data.
You need to check the exact specification of the protocol. (Are you using TSP - RFC 3161, or RTSP - RFC 2326?)

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