asn1.h

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#ifndef ASN1_H
#define ASN1_H

#define ASN1_TAG_EOC            0x00 /* not used with DER */
#define ASN1_TAG_BOOLEAN        0x01
#define ASN1_TAG_INTEGER        0x02
#define ASN1_TAG_BITSTRING      0x03
#define ASN1_TAG_OCTETSTRING    0x04
#define ASN1_TAG_NULL           0x05
#define ASN1_TAG_OID            0x06
#define ASN1_TAG_OBJECT_DESCRIPTOR      0x07 /* not yet parsed */
#define ASN1_TAG_EXTERNAL       0x08 /* not yet parsed */
#define ASN1_TAG_REAL           0x09 /* not yet parsed */
#define ASN1_TAG_ENUMERATED     0x0A /* not yet parsed */
#define ASN1_TAG_UTF8STRING     0x0C /* not yet parsed */
#define ANS1_TAG_RELATIVE_OID   0x0D
#define ASN1_TAG_SEQUENCE       0x10 /* shall be constructed */
#define ASN1_TAG_SET            0x11
#define ASN1_TAG_NUMERICSTRING  0x12 /* not yet parsed */
#define ASN1_TAG_PRINTABLESTRING        0x13
#define ASN1_TAG_TG1STRING      0x14 /* not yet parsed */
#define ASN1_TAG_VIDEOTEXSTRING 0x15 /* not yet parsed */
#define ASN1_TAG_IA5STRING      0x16
#define ASN1_TAG_UTCTIME        0x17
#define ASN1_TAG_GENERALIZEDTIME        0x18 /* not yet parsed */
#define ASN1_TAG_GRAPHICSTRING  0x19 /* not yet parsed */
#define ASN1_TAG_VISIBLESTRING  0x1A
#define ASN1_TAG_GENERALSTRING  0x1B /* not yet parsed */
#define ASN1_TAG_UNIVERSALSTRING        0x1C /* not yet parsed */
#define ASN1_TAG_BMPSTRING      0x1D /* not yet parsed */

#define ASN1_CLASS_UNIVERSAL            0
#define ASN1_CLASS_APPLICATION          1
#define ASN1_CLASS_CONTEXT_SPECIFIC     2
#define ASN1_CLASS_PRIVATE              3


struct asn1_hdr {
        const u8 *payload;
        u8 identifier, class, constructed;
        unsigned int tag, length;
};

#define ASN1_MAX_OID_LEN 20
struct asn1_oid {
        unsigned long oid[ASN1_MAX_OID_LEN];
        size_t len;
};


int asn1_get_next(const u8 *buf, size_t len, struct asn1_hdr *hdr);
int asn1_parse_oid(const u8 *buf, size_t len, struct asn1_oid *oid);
int asn1_get_oid(const u8 *buf, size_t len, struct asn1_oid *oid,
                 const u8 **next);
void asn1_oid_to_str(const struct asn1_oid *oid, char *buf, size_t len);
unsigned long asn1_bit_string_to_long(const u8 *buf, size_t len);
int asn1_oid_equal(const struct asn1_oid *a, const struct asn1_oid *b);

extern struct asn1_oid asn1_sha1_oid;
extern struct asn1_oid asn1_sha256_oid;

#endif /* ASN1_H */