path: root/crypto/asymmetric_keys
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authorDavid Howells <dhowells@redhat.com>2012-09-21 23:31:13 +0100
committerRusty Russell <rusty@rustcorp.com.au>2012-10-08 13:50:19 +1030
commit4520c6a49af833c83de6c74525ce8e07bbe6d783 (patch)
tree66b6b43e95cf270e00aa5cb308a12534f33216d9 /crypto/asymmetric_keys
parent4f73175d0375a7c1b3ae625e76acee8b39741f28 (diff)
X.509: Add simple ASN.1 grammar compiler
Add a simple ASN.1 grammar compiler. This produces a bytecode output that can be fed to a decoder to inform the decoder how to interpret the ASN.1 stream it is trying to parse. Action functions can be specified in the grammar by interpolating: ({ foo }) after a type, for example: SubjectPublicKeyInfo ::= SEQUENCE { algorithm AlgorithmIdentifier, subjectPublicKey BIT STRING ({ do_key_data }) } The decoder is expected to call these after matching this type and parsing the contents if it is a constructed type. The grammar compiler does not currently support the SET type (though it does support SET OF) as I can't see a good way of tracking which members have been encountered yet without using up extra stack space. Currently, the grammar compiler will fail if more than 256 bytes of bytecode would be produced or more than 256 actions have been specified as it uses 8-bit jump values and action indices to keep space usage down. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Diffstat (limited to 'crypto/asymmetric_keys')
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