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Current version:
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Image format

Starting at version 1.1, m0n0wall .img files have the following structure:

standard gzipped bootable image
RSA signature
signature length (2 bytes)
Intel byte order
magic (4 bytes, cb774de1h)

The signature is generated with the OpenSSL crypto library's EVP signing functions, using SHA1 as the digest. The RSA public key which is used to verify the signature can be found here.

© 2003-2014 by Manuel Kasper <>. All rights reserved.