struct AvbRSAPublicKeyHeader

The header for a serialized RSA public key.

The size of the key is given by |key_num_bits|, for example 2048

for a RSA-2048 key. By definition, a RSA public key is the pair (n,

e) where |n| is the modulus (which can be represented in

|key_num_bits| bits) and |e| is the public exponent. The exponent

is not stored since it's assumed to always be 65537.

To optimize verification, the key block includes two precomputed

values, |n0inv| (fits in 32 bits) and |rr| and can always be

represented in |key_num_bits|.

The value |n0inv| is the value -1/n[0] (mod 2^32). The value |rr|

is (2^key_num_bits)^2 (mod n).

Following this header is |key_num_bits| bits of |n|, then

|key_num_bits| bits of |rr|. Both values are stored with most

significant bit first. Each serialized number takes up

|key_num_bits|/8 bytes.

All fields in this struct are stored in network byte order when

serialized. To generate a copy with fields swapped to native byte

order, use the function avb_rsa_public_key_header_validate_and_byteswap().

The avb_rsa_verify() function expects a key in this serialized

format.

The 'avbtool extract_public_key' command can be used to generate a

serialized RSA public key.