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[crypto] Generalise X.509 OID-identified algorithm to asn1.c

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The concept of an OID-identified algorithm as defined in X.509 is used
in some other standards (e.g. PKCS#7).  Generalise this functionality
and provide it as part of the ASN.1 core.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2012-03-21 13:57:32 +00:00
parent 9a03a8e3d2
commit 38b7e43f7d
5 changed files with 155 additions and 121 deletions
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54
src/crypto/asn1.c
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@@ -22,6 +22,7 @@ FILE_LICENCE ( GPL2_OR_LATER );
#include <stddef.h>
#include <string.h>
#include <errno.h>
#include <ipxe/tables.h>
#include <ipxe/asn1.h>
/** @file
@@ -341,3 +342,56 @@ int asn1_compare ( const struct asn1_cursor *cursor1,
return ( difference ? difference :
memcmp ( cursor1->data, cursor2->data, cursor1->len ) );
}
/**
* Identify ASN.1 algorithm by OID
*
* @v cursor ASN.1 object cursor
* @ret algorithm Algorithm, or NULL
*/
static struct asn1_algorithm *
asn1_find_algorithm ( const struct asn1_cursor *cursor ) {
struct asn1_algorithm *algorithm;
for_each_table_entry ( algorithm, ASN1_ALGORITHMS ) {
if ( asn1_compare ( &algorithm->oid, cursor ) == 0 )
return algorithm;
}
return NULL;
}
/**
* Parse ASN.1 OID-identified algorithm
*
* @v cursor ASN.1 object cursor
* @ret algorithm Algorithm, or NULL
*/
struct asn1_algorithm * asn1_algorithm ( const struct asn1_cursor *cursor ) {
struct asn1_cursor contents;
struct asn1_algorithm *algorithm;
int rc;
/* Enter signatureAlgorithm */
memcpy ( &contents, cursor, sizeof ( contents ) );
asn1_enter ( &contents, ASN1_SEQUENCE );
/* Enter algorithm */
if ( ( rc = asn1_enter ( &contents, ASN1_OID ) ) != 0 ) {
DBGC ( cursor, "ASN1 %p cannot locate algorithm OID:\n",
cursor );
DBGC_HDA ( cursor, 0, cursor->data, cursor->len );
return NULL;
}
/* Identify algorithm */
algorithm = asn1_find_algorithm ( &contents );
if ( ! algorithm ) {
DBGC ( cursor, "ASN1 %p unrecognised algorithm:\n", cursor );
DBGC_HDA ( cursor, 0, cursor->data, cursor->len );
return NULL;
}
return algorithm;
}