/*
* keyid.c - Routines to calculate key IDs.
*
- * Jonathan McDowell <noodles@earth.li>
+ * Copyright 2002,2011 Jonathan McDowell <noodles@earth.li>
*
- * Copyright 2002 Project Purple
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc., 51
+ * Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
+#include <string.h>
#include <sys/types.h>
+#include <arpa/inet.h>
+#include "config.h"
#include "keyid.h"
#include "keystructs.h"
+#include "log.h"
+#include "parsekey.h"
+#include "mem.h"
+#include "merge.h"
+
+#ifdef HAVE_NETTLE
+#include <nettle/md5.h>
+#include <nettle/sha.h>
+#else
#include "md5.h"
-#include "sha.h"
+#include "sha1.h"
+#endif
+
/**
* get_keyid - Given a public key returns the keyid.
- * @publickey: The key to calculate the fingerprint for.
+ * @publickey: The key to calculate the id for.
*/
uint64_t get_keyid(struct openpgp_publickey *publickey)
{
- SHA1_CONTEXT sha_ctx;
- uint64_t keyid = 0;
- int offset = 0;
- int i = 0;
+ return (get_packetid(publickey->publickey));
+}
+
+/**
+ * get_fingerprint - Given a public key returns the fingerprint.
+ * @publickey: The key to calculate the id for.
+ * @fingerprint: The fingerprint (must be at least 20 bytes of space).
+ * @len: The length of the returned fingerprint.
+ *
+ * This function returns the fingerprint for a given public key. As Type 3
+ * fingerprints are 16 bytes and Type 4 are 20 the len field indicates
+ * which we've returned.
+ */
+unsigned char *get_fingerprint(struct openpgp_packet *packet,
+ unsigned char *fingerprint,
+ size_t *len)
+{
+ struct sha1_ctx sha_ctx;
+ struct md5_ctx md5_context;
unsigned char c;
- unsigned char *buff = NULL;
+ size_t modlen, explen;
- assert(publickey != NULL);
+ log_assert(fingerprint != NULL);
+ log_assert(len != NULL);
- switch (publickey->publickey->data[0]) {
+ *len = 0;
+
+ switch (packet->data[0]) {
case 2:
case 3:
+ md5_init(&md5_context);
+
/*
- * For a type 2 or 3 key the keyid is the last 64 bits of the
- * public modulus n, which is stored as an MPI from offset 8
- * onwards.
- *
- * We need to ensure it's an RSA key.
+ * MD5 the modulus and exponent.
*/
- if (publickey->publickey->data[7] == 1) {
- offset = (publickey->publickey->data[8] << 8) +
- publickey->publickey->data[9];
- offset = ((offset + 7) / 8) + 2;
-
- for (keyid = 0, i = 0; i < 8; i++) {
- keyid <<= 8;
- keyid += publickey->publickey->data[offset++];
- }
- } else {
- fputs("Type 2 or 3 key, but not RSA.\n", stderr);
- }
+ modlen = ((packet->data[8] << 8) +
+ packet->data[9] + 7) >> 3;
+ md5_update(&md5_context, modlen, &packet->data[10]);
+
+ explen = ((packet->data[10+modlen] << 8) +
+ packet->data[11+modlen] + 7) >> 3;
+ md5_update(&md5_context, explen, &packet->data[12 + modlen]);
+
+ *len = 16;
+ md5_digest(&md5_context, *len, fingerprint);
+
break;
+
case 4:
- /*
- * For a type 4 key the keyid is the last 64 bits of the
- * fingerprint, which is the 160 bit SHA-1 hash of the packet
- * tag, 2 octet packet length and the public key packet
- * including version field.
- */
sha1_init(&sha_ctx);
/*
* TODO: Can this be 0x99? Are all public key packets old
* format with 2 bytes of length data?
*/
c = 0x99;
- sha1_write(&sha_ctx, &c, sizeof(c));
- c = publickey->publickey->length >> 8;
- sha1_write(&sha_ctx, &c, sizeof(c));
- c = publickey->publickey->length & 0xFF;
- sha1_write(&sha_ctx, &c, sizeof(c));
- sha1_write(&sha_ctx, publickey->publickey->data,
- publickey->publickey->length);
- sha1_final(&sha_ctx);
- buff = sha1_read(&sha_ctx);
-
- assert(buff != NULL);
+ sha1_update(&sha_ctx, sizeof(c), &c);
+ c = packet->length >> 8;
+ sha1_update(&sha_ctx, sizeof(c), &c);
+ c = packet->length & 0xFF;
+ sha1_update(&sha_ctx, sizeof(c), &c);
+ sha1_update(&sha_ctx, packet->length,
+ packet->data);
+ *len = 20;
+ sha1_digest(&sha_ctx, *len, fingerprint);
+
+ break;
+ default:
+ logthing(LOGTHING_ERROR, "Unknown key type: %d",
+ packet->data[0]);
+ }
+
+ return fingerprint;
+}
+
+
+/**
+ * get_packetid - Given a PGP packet returns the keyid.
+ * @packet: The packet to calculate the id for.
+ */
+uint64_t get_packetid(struct openpgp_packet *packet)
+{
+ uint64_t keyid = 0;
+ int offset = 0;
+ int i = 0;
+ size_t length = 0;
+ unsigned char buff[20];
+
+ log_assert(packet != NULL);
+
+ switch (packet->data[0]) {
+ case 2:
+ case 3:
+ /*
+ * For a type 2 or 3 key the keyid is the last 64 bits of the
+ * public modulus n, which is stored as an MPI from offset 8
+ * onwards.
+ */
+ offset = (packet->data[8] << 8) +
+ packet->data[9];
+ offset = ((offset + 7) / 8) + 2;
+
+ for (keyid = 0, i = 0; i < 8; i++) {
+ keyid <<= 8;
+ keyid += packet->data[offset++];
+ }
+ /*
+ * Check for an RSA key; if not then log but accept anyway.
+ * 1 == RSA
+ * 2 == RSA Encrypt-Only
+ * 3 == RSA Sign-Only
+ */
+ if (packet->data[7] < 1 || packet->data[7] > 3) {
+ logthing(LOGTHING_NOTICE,
+ "Type 2 or 3 key, but not RSA: %llx (type %d)",
+ keyid,
+ packet->data[7]);
+ }
+ break;
+ case 4:
+ get_fingerprint(packet, buff, &length);
for (keyid = 0, i = 12; i < 20; i++) {
keyid <<= 8;
break;
default:
- fprintf(stderr, "Unknown key type: %d\n",
- publickey->publickey->data[0]);
+ logthing(LOGTHING_ERROR, "Unknown key type: %d",
+ packet->data[0]);
}
return keyid;
}
+
+static struct openpgp_packet_list *sortpackets(struct openpgp_packet_list
+ *packets)
+{
+ struct openpgp_packet_list *sorted, **cur, *next;
+
+ sorted = NULL;
+ while (packets != NULL) {
+ cur = &sorted;
+ while (*cur != NULL && compare_packets((*cur)->packet,
+ packets->packet) < 0) {
+ cur = &((*cur)->next);
+ }
+ next = *cur;
+ *cur = packets;
+ packets = packets->next;
+ (*cur)->next = next;
+ }
+
+ return sorted;
+}
+
+void get_skshash(struct openpgp_publickey *key, struct skshash *hash)
+{
+ struct openpgp_packet_list *packets = NULL, *list_end = NULL;
+ struct openpgp_packet_list *curpacket;
+ struct md5_ctx md5_context;
+ struct openpgp_publickey *next;
+ uint32_t tmp;
+
+ /*
+ * We only want a single key, so clear any link to the next
+ * one for the period during the flatten.
+ */
+ next = key->next;
+ key->next = NULL;
+ flatten_publickey(key, &packets, &list_end);
+ key->next = next;
+ packets = sortpackets(packets);
+
+ md5_init(&md5_context);
+
+ for (curpacket = packets; curpacket != NULL;
+ curpacket = curpacket->next) {
+ tmp = htonl(curpacket->packet->tag);
+ md5_update(&md5_context, sizeof(tmp), (void *) &tmp);
+ tmp = htonl(curpacket->packet->length);
+ md5_update(&md5_context, sizeof(tmp), (void *) &tmp);
+ md5_update(&md5_context,
+ curpacket->packet->length,
+ curpacket->packet->data);
+ }
+
+ md5_digest(&md5_context, 16, (uint8_t *) &hash->hash);
+ free_packet_list(packets);
+}
+
+uint8_t hexdigit(char c)
+{
+ if (c >= '0' && c <= '9')
+ return c - '0';
+ else if (c >= 'a' && c <= 'f')
+ return c - 'a' + 10;
+ else if (c >= 'A' && c <= 'F')
+ return c - 'A' + 10;
+ else
+ return 0;
+}
+
+int parse_skshash(char *search, struct skshash *hash)
+{
+ int i, len;
+
+ len = strlen(search);
+ if (len > 32) {
+ return 0;
+ }
+
+ for (i = 0; i < len; i += 2) {
+ hash->hash[i >> 1] = (hexdigit(search[i]) << 4) +
+ hexdigit(search[i + 1]);
+ }
+
+ return 1;
+}
projects / onak.git / blobdiff