path: root/crypto/asymmetric_keys
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authorDavid Howells <dhowells@redhat.com>2012-09-24 17:11:16 +0100
committerRusty Russell <rusty@rustcorp.com.au>2012-10-08 13:50:20 +1030
commit42d5ec27f873c654a68f7f865dcd7737513e9508 (patch)
treea52fdc8d71dfc3724e4b2828fd53958e3774c761 /crypto/asymmetric_keys
parent4520c6a49af833c83de6c74525ce8e07bbe6d783 (diff)
X.509: Add an ASN.1 decoder
Add an ASN.1 BER/DER/CER decoder. This uses the bytecode from the ASN.1 compiler in the previous patch to inform it as to what to expect to find in the encoded byte stream. The output from the compiler also tells it what functions to call on what tags, thus allowing the caller to retrieve information. The decoder is called as follows: int asn1_decoder(const struct asn1_decoder *decoder, void *context, const unsigned char *data, size_t datalen); The decoder argument points to the bytecode from the ASN.1 compiler. context is the caller's context and is passed to the action functions. data and datalen define the byte stream to be decoded. Note that the decoder is currently limited to datalen being less than 64K. This reduces the amount of stack space used by the decoder because ASN.1 is a nested construct. Similarly, the decoder is limited to a maximum of 10 levels of constructed data outside of a leaf node also in an effort to keep stack usage down. These restrictions can be raised if necessary. 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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