+/*
+ * decodekey.c - Routines to further decode an OpenPGP key.
+ *
+ * Jonathan McDowell <noodles@earth.li>
+ *
+ * Copyright 2002 Project Purple
+ */
+
+#include <assert.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+
+#include "decodekey.h"
+#include "hash.h"
+#include "keyid.h"
+#include "keystructs.h"
+#include "ll.h"
+
+/*
+ * parse_subpackets - Parse the subpackets of a Type 4 signature.
+ * @data: The subpacket data.
+ * @keyid: A pointer to where we should return the keyid.
+ *
+ * This function parses the subkey data of a Type 4 signature and fills
+ * in the supplied variables. It also returns the length of the data
+ * processed.
+ */
+int parse_subpackets(unsigned char *data, uint64_t *keyid)
+{
+ int offset = 0;
+ int length = 0;
+ int packetlen = 0;
+
+ assert(data != NULL);
+
+ length = (data[0] << 8) + data[1] + 2;
+
+ offset = 2;
+ while (offset < length) {
+ packetlen = data[offset++];
+ if (packetlen > 191 && packetlen < 255) {
+ packetlen = ((packetlen - 192) << 8) +
+ data[offset++] + 192;
+ } else if (packetlen == 255) {
+ packetlen = data[offset++];
+ packetlen <<= 8;
+ packetlen = data[offset++];
+ packetlen <<= 8;
+ packetlen = data[offset++];
+ packetlen <<= 8;
+ packetlen = data[offset++];
+ }
+ switch (data[offset]) {
+ case 2:
+ /*
+ * Signature creation time. Might want to output this?
+ */
+ break;
+ case 0x83:
+ /*
+ * Signature expiration time. Might want to output this?
+ */
+ break;
+ case 16:
+ *keyid = data[offset+packetlen - 8];
+ *keyid <<= 8;
+ *keyid += data[offset+packetlen - 7];
+ *keyid <<= 8;
+ *keyid += data[offset+packetlen - 6];
+ *keyid <<= 8;
+ *keyid += data[offset+packetlen - 5];
+ *keyid <<= 8;
+ *keyid += data[offset+packetlen - 4];
+ *keyid <<= 8;
+ *keyid += data[offset+packetlen - 3];
+ *keyid <<= 8;
+ *keyid += data[offset+packetlen - 2];
+ *keyid <<= 8;
+ *keyid += data[offset+packetlen - 1];
+ break;
+ case 23:
+ /*
+ * Key server preferences. Including no-modify.
+ */
+ break;
+ case 25:
+ /*
+ * Primary UID.
+ */
+ break;
+ default:
+ /*
+ * We don't care about unrecognized packets unless bit
+ * 7 is set in which case we prefer an error than
+ * ignoring it.
+ */
+ assert(!(data[offset] & 0x80));
+ }
+ offset += packetlen;
+ }
+
+ return length;
+}
+
+/**
+ * keysigs - Return the sigs on a given OpenPGP signature list.
+ * @curll: The current linked list. Can be NULL to create a new list.
+ * @sigs: The signature list we want the sigs on.
+ *
+ * Returns a linked list of stats_key elements containing the sigs on the
+ * supplied OpenPGP packet list.
+ */
+struct ll *keysigs(struct ll *curll,
+ struct openpgp_packet_list *sigs)
+{
+ uint64_t keyid = 0;
+
+ while (sigs != NULL) {
+ keyid = sig_keyid(sigs->packet);
+ sigs = sigs->next;
+ curll = lladd(curll, createandaddtohash(keyid));
+ }
+
+ return curll;
+}
+
+/**
+ * sig_keyid - Return the keyid for a given OpenPGP signature packet.
+ * @packet: The signature packet.
+ *
+ * Returns the keyid for the supplied signature packet.
+ */
+uint64_t sig_keyid(struct openpgp_packet *packet)
+{
+ int length = 0;
+ uint64_t keyid = 0;
+
+ if (packet != NULL) {
+ keyid = 0;
+ switch (packet->data[0]) {
+ case 2:
+ case 3:
+ keyid = packet->data[7];
+ keyid <<= 8;
+ keyid += packet->data[8];
+ keyid <<= 8;
+ keyid += packet->data[9];
+ keyid <<= 8;
+ keyid += packet->data[10];
+ keyid <<= 8;
+ keyid += packet->data[11];
+ keyid <<= 8;
+ keyid += packet->data[12];
+ keyid <<= 8;
+ keyid += packet->data[13];
+ keyid <<= 8;
+ keyid += packet->data[14];
+ break;
+ case 4:
+ length = parse_subpackets(&packet->data[4],
+ &keyid);
+ parse_subpackets(&packet->data[length + 4],
+ &keyid);
+ /*
+ * Don't bother to look at the unsigned packets.
+ */
+ break;
+ default:
+ break;
+ }
+ }
+
+ return keyid;
+}
+
+/*
+ * TODO: Abstract out; all our linked lists should be generic and then we can
+ * llsize them.
+ */
+int spsize(struct openpgp_signedpacket_list *list)
+{
+ int size = 0;
+ struct openpgp_signedpacket_list *cur;
+
+ for (cur = list; cur != NULL; cur = cur->next, size++) ;
+
+ return size;
+}
+
+/**
+ * keyuids - Takes a key and returns an array of its UIDs
+ * @key: The key to get the uids of.
+ * @primary: A pointer to store the primary UID in.
+ *
+ * keyuids takes a public key structure and builds an array of the UIDs
+ * on the key. It also attempts to work out the primary UID and returns a
+ * separate pointer to that particular element of the array.
+ */
+char **keyuids(struct openpgp_publickey *key, char **primary)
+{
+ struct openpgp_signedpacket_list *curuid = NULL;
+ char buf[1024];
+ char **uids = NULL;
+ int count = 0;
+
+ if (key != NULL && key->uids != NULL) {
+ uids = malloc((spsize(key->uids) + 1) * sizeof (char *));
+
+ curuid = key->uids;
+ while (curuid != NULL) {
+ buf[0] = 0;
+ if (curuid->packet->tag == 13) {
+ snprintf(buf, 1023, "%.*s",
+ (int) curuid->packet->length,
+ curuid->packet->data);
+ uids[count++] = strdup(buf);
+ }
+ curuid = curuid -> next;
+ }
+ uids[count] = NULL;
+ }
+ /*
+ * TODO: Parse subpackets for real primary ID (v4 keys)
+ */
+ if (primary != NULL) {
+ *primary = uids[0];
+ }
+
+ return uids;
+}
projects / onak.git / commitdiff