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[crypto] Add ASN.1 functions for X.509 certificate parsing

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Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2012-03-13 16:30:17 +00:00
parent ffb6d6be6d
commit f229162749
2 changed files with 154 additions and 21 deletions
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113
src/include/ipxe/asn1.h
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@@ -9,18 +9,7 @@
FILE_LICENCE ( GPL2_OR_LATER );
#define ASN1_INTEGER 0x02
#define ASN1_BIT_STRING 0x03
#define ASN1_OCTET_STRING 0x04
#define ASN1_NULL 0x05
#define ASN1_OID 0x06
#define ASN1_SEQUENCE 0x30
#define ASN1_IP_ADDRESS 0x40
#define ASN1_EXPLICIT_TAG 0xa0
/**
* A DER-encoded ASN.1 object cursor
*/
/** An ASN.1 object cursor */
struct asn1_cursor {
/** Start of data */
const void *data;
@@ -28,19 +17,111 @@ struct asn1_cursor {
size_t len;
};
/** ASN.1 end */
#define ASN1_END 0x00
/** ASN.1 integer */
#define ASN1_INTEGER 0x02
/** ASN.1 bit string */
#define ASN1_BIT_STRING 0x03
/** ASN.1 octet string */
#define ASN1_OCTET_STRING 0x04
/** ASN.1 null */
#define ASN1_NULL 0x05
/** ASN.1 object identifier */
#define ASN1_OID 0x06
/** ASN.1 UTC time */
#define ASN1_UTC_TIME 0x17
/** ASN.1 generalized time */
#define ASN1_GENERALIZED_TIME 0x18
/** ASN.1 sequence */
#define ASN1_SEQUENCE 0x30
/** ASN.1 set */
#define ASN1_SET 0x31
/** ASN.1 explicit tag */
#define ASN1_EXPLICIT_TAG 0xa0
/** ASN.1 "any tag" magic value */
#define ASN1_ANY -1U
/** Initial OID byte */
#define ASN1_OID_INITIAL( first, second ) ( ( (first) * 40 ) + (second) )
/** Single-byte OID value
*
* Valid for values up to 127
*/
#define ASN1_OID_SINGLE( value ) ( (value) & 0x7f )
/** Double-byte OID value
*
* Valid for values up to 16383
*/
#define ASN1_OID_DOUBLE( value ) \
( 0x80 | ( ( (value) >> 7 ) & 0x7f ) ), ASN1_OID_SINGLE ( (value) )
/** Double-byte OID value
*
* Valid for values up to 2097151
*/
#define ASN1_OID_TRIPLE( value ) \
( 0x80 | ( ( (value) >> 14 ) & 0x7f ) ), ASN1_OID_DOUBLE ( (value) )
/** ASN.1 OID for iso(1) member-body(2) */
#define ASN1_OID_ISO_MEMBERBODY ASN1_OID_INITIAL ( 1, 2 )
/** ASN.1 OID for joint-iso-itu-t(2) ds(5) */
#define ASN1_OID_DIRECTORY_SERVICES ASN1_OID_INITIAL ( 2, 5 )
/** ASN.1 OID for joint-iso-itu-t(2) ds(5) attributeType(4) */
#define ASN1_OID_ATTRIBUTE_TYPE \
ASN1_OID_DIRECTORY_SERVICES, ASN1_OID_SINGLE ( 4 )
/** ASN.1 OID for joint-iso-itu-t(2) ds(5) attributeType(4) commonName(3) */
#define ASN1_OID_COMMON_NAME ASN1_OID_ATTRIBUTE_TYPE, ASN1_OID_SINGLE ( 3 )
/** Define an ASN.1 cursor containing an OID */
#define ASN1_OID_CURSOR( oid_value ) { \
.data = oid_value, \
.len = sizeof ( oid_value ), \
}
/** An ASN.1 bit string */
struct asn1_bit_string {
/** Number of unused bits */
uint8_t unused;
/** Data */
uint8_t data[0];
} __attribute__ (( packed ));
/**
* Invalidate ASN.1 object cursor
* Extract ASN.1 type
*
* @v cursor ASN.1 object cursor
* @ret type Type
*/
static inline __attribute__ (( always_inline )) void
asn1_invalidate_cursor ( struct asn1_cursor *cursor ) {
cursor->len = 0;
static inline __attribute__ (( always_inline )) unsigned int
asn1_type ( const struct asn1_cursor *cursor ) {
return ( *( ( const uint8_t * ) cursor->data ) );
}
extern void asn1_invalidate_cursor ( struct asn1_cursor *cursor );
extern int asn1_enter ( struct asn1_cursor *cursor, unsigned int type );
extern int asn1_skip_if_exists ( struct asn1_cursor *cursor,
unsigned int type );
extern int asn1_skip ( struct asn1_cursor *cursor, unsigned int type );
extern int asn1_enter_any ( struct asn1_cursor *cursor );
extern int asn1_skip_any ( struct asn1_cursor *cursor );
extern int asn1_compare ( const struct asn1_cursor *cursor1,
const struct asn1_cursor *cursor2 );
#endif /* _IPXE_ASN1_H */