--- /dev/null
+/* -*-c-*-
+ *
+ * Manipulating key data
+ *
+ * (c) 1999 Straylight/Edgeware
+ */
+
+/*----- Licensing notice --------------------------------------------------*
+ *
+ * This file is part of Catacomb.
+ *
+ * Catacomb is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Library General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * Catacomb 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 Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with Catacomb; if not, write to the Free
+ * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+ * MA 02111-1307, USA.
+ */
+
+#ifndef CATACOMB_KEY_DATA_H
+#define CATACOMB_KEY_DATA_H
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+/*----- Header files ------------------------------------------------------*/
+
+#include <stddef.h>
+
+#include <mLib/bits.h>
+#include <mLib/dstr.h>
+#include <mLib/sym.h>
+
+#ifndef CATACOMB_KEY_ERROR_H
+# include "key-error.h"
+#endif
+
+#ifndef CATACOMB_MP_H
+# include "mp.h"
+#endif
+
+#ifndef CATACOMB_EC_H
+# include "ec.h"
+#endif
+
+/*----- Data structures ---------------------------------------------------*/
+
+/* --- Key binary data --- */
+
+typedef struct key_bin {
+ octet *k; /* Pointer to key data */
+ size_t sz; /* Size of the key data (in bytes) */
+} key_bin;
+
+/* --- Key data structure --- */
+
+typedef struct key_data {
+ unsigned e; /* Encoding type for key data */
+ unsigned ref; /* Reference counter */
+ union {
+ key_bin k; /* Binary key data */
+ mp *m; /* Multiprecision integer */
+ sym_table s; /* Structured key data */
+ char *p; /* String pointer */
+ ec e; /* Elliptic curve point */
+ } u;
+} key_data;
+
+typedef struct key_struct {
+ sym_base _b;
+ key_data *k;
+} key_struct;
+
+typedef struct key_subkeyiter { sym_iter i; } key_subkeyiter;
+
+/* --- Packing and unpacking --- */
+
+typedef struct key_packdef {
+ unsigned e; /* Key data encoding type */
+ void *p; /* Pointer to the destination */
+ key_data *kd; /* Key data block */
+} key_packdef;
+
+typedef struct key_packstruct {
+ char *name; /* Pointer to name string */
+ key_packdef kp; /* Packing structure */
+} key_packstruct;
+
+/* --- Key binary encoding --- *
+ *
+ * The binary encoding consists of a header containing a 16-bit encoding type
+ * and a 16-bit length, followed immediately by the key data, followed by
+ * between zero and three zero bytes to make the total length a multiple of
+ * four. The format of the following data depends on the encoding type:
+ *
+ * @KENC_BINARY@ Binary data.
+ *
+ * @KENC_MP@ Octet array interpreted in big-endian byte order.
+ *
+ * @KENC_STRUCT@ An array of pairs, each containing a string (8-bit
+ * length followed by data and zero-padding to 4-byte
+ * boundary) and key binary encodings.
+ *
+ * @KENC_ENCRYPT@ Binary data, format
+ */
+
+/* --- Key encoding methods and other flags--- */
+
+enum {
+
+ /* --- Bottom two bits are the encoding type --- */
+
+ KF_ENCMASK = 0x83, /* Encoding mask */
+ KENC_BINARY = 0x00, /* Plain binary key (@k@) */
+ KENC_MP = 0x01, /* Multiprecision integer (@i@) */
+ KENC_STRUCT = 0x02, /* Structured key data (@s@) */
+ KENC_ENCRYPT = 0x03, /* Encrypted key type (@k@) */
+ KENC_STRING = 0x80, /* ASCII string (@p@) */
+ KENC_EC = 0x81, /* Elliptic curve point (@e@) */
+
+ /* --- Key category bits --- */
+
+ KF_CATMASK = 0x0c, /* Category mask */
+ KCAT_SYMM = 0x00, /* Symmetric encryption key */
+ KCAT_PRIV = 0x04, /* Private (asymmetric) key */
+ KCAT_PUB = 0x08, /* Public (asymmetric) key */
+ KCAT_SHARE = 0x0c, /* Shared (asymmetric) key */
+ KF_NONSECRET = 0x08, /* Bit flag for non-secret keys */
+
+ /* --- Other flags --- */
+
+ KF_BURN = 0x10, /* Burn key after use */
+ KF_OPT = 0x20, /* Optional key (for @key_unpack@) */
+
+ /* --- Tag end --- */
+
+ KENC_MAX /* Dummy limit constant */
+};
+
+/* --- Key locking return codes --- */
+
+#define KL_OK 0 /* All good */
+#define KL_IOERR -1 /* I/O problem (e.g., getting pp) */
+#define KL_KEYERR -2 /* Wrong key supplied */
+#define KL_DATAERR -3 /* Data format error */
+
+/* --- Key flag filtering --- */
+
+typedef struct key_filter {
+ unsigned f;
+ unsigned m;
+} key_filter;
+
+/* --- Matching aginst key selection --- */
+
+#define KEY_MATCH(kd, kf) \
+ (!(kf) || \
+ ((kd)->e & KF_ENCMASK) == KENC_STRUCT || \
+ ((kd)->e & (kf)->m) == (kf)->f)
+
+/*----- Key flags and filtering -------------------------------------------*/
+
+/* --- @key_readflags@ --- *
+ *
+ * Arguments: @const char *p@ = pointer to string to read
+ * @char **pp@ = where to store the end pointer
+ * @unsigned *ff@ = where to store the flags
+ * @unsigned *mm@ = where to store the mask
+ *
+ * Returns: Zero if all went well, nonzero if there was an error.
+ *
+ * Use: Reads a flag string.
+ */
+
+extern int key_readflags(const char */*p*/, char **/*pp*/,
+ unsigned */*ff*/, unsigned */*mm*/);
+
+/* --- @key_writeflags@ --- *
+ *
+ * Arguments: @unsigned f@ = flags to write
+ * @dstr *d@ = pointer to destination string
+ *
+ * Returns: ---
+ *
+ * Use: Emits a flags word as a string representation.
+ */
+
+extern void key_writeflags(unsigned /*f*/, dstr */*d*/);
+
+/* --- @key_match@ --- *
+ *
+ * Arguments: @key_data *k@ = pointer to key data block
+ * @const key_filter *kf@ = pointer to filter block
+ *
+ * Returns: Nonzero if the key matches the filter.
+ *
+ * Use: Checks whether a key matches a filter.
+ */
+
+extern int key_match(key_data */*k*/, const key_filter */*kf*/);
+
+/*----- Setting new key data ----------------------------------------------*/
+
+/* --- @key_newraw@ --- *
+ *
+ * Arguments: @unsigned e@ = encoding type to set
+ *
+ * Returns: New key block, not filled in.
+ */
+
+extern key_data *key_newraw(unsigned /*e*/);
+
+/* --- @key_newbinary@ --- *
+ *
+ * Arguments: @unsigned e@ = other encoding flags
+ * @const void *p@ = pointer to key data
+ * @size_t sz@ = size of the key data
+ *
+ * Returns: New key data object.
+ */
+
+extern key_data *key_newbinary(unsigned /*e*/,
+ const void */*p*/, size_t /*sz*/);
+
+/* --- @key_newencrypted@ --- *
+ *
+ * Arguments: @unsigned e@ = other encoding flags
+ * @const void *p@ = pointer to key data
+ * @size_t sz@ = size of the key data
+ *
+ * Returns: New key data object.
+ */
+
+extern key_data *key_newencrypted(unsigned /*e*/,
+ const void */*p*/, size_t /*sz*/);
+
+/* --- @key_newmp@ --- *
+ *
+ * Arguments: @unsigned e@ = other encoding flags
+ * @mp *m@ = pointer to the value to set
+ *
+ * Returns: New key data object.
+ */
+
+extern key_data *key_newmp(unsigned /*e*/, mp */*m*/);
+
+/* --- @key_newstring@ --- *
+ *
+ * Arguments: @unsigned e@ = other encoding flags
+ * @const char *p@ = pointer to the value to set
+ *
+ * Returns: New key data object.
+ */
+
+extern key_data *key_newstring(unsigned /*e*/, const char */*p*/);
+
+/* --- @key_newec@ --- *
+ *
+ * Arguments: @unsigned e@ = other encoding flags
+ * @const ec *pt@ = pointer to the value to set
+ *
+ * Returns: New key data object.
+ */
+
+extern key_data *key_newec(unsigned /*e*/, const ec */*pt*/);
+
+/* --- @key_newstruct@ --- *
+ *
+ * Arguments: ---
+ *
+ * Returns: New key data object.
+ */
+
+extern key_data *key_newstruct(void);
+
+/* --- @key_structfind@ --- *
+ *
+ * Arguments: @key_data *k@ = pointer to key data block
+ * @const char *tag@ = pointer to tag string
+ *
+ * Returns: Pointer to key data block, or null.
+ *
+ * Use: Looks up the tag in a structured key.
+ */
+
+extern key_data *key_structfind(key_data */*k*/, const char */*tag*/);
+
+/* --- @key_mksubkeyiter@ --- *
+ *
+ * Arguments: @key_subkeyiter *i@ = pointer to iterator block
+ * @key_data *k@ = pointer to key data block
+ *
+ * Returns: ---
+ *
+ * Use: Initializes a subkey iterator.
+ */
+
+extern void key_mksubkeyiter(key_subkeyiter */*i*/, key_data */*k*/);
+
+/* --- @key_nextsubkey@ --- *
+ *
+ * Arguments: @key_structiter *i@ = pointer to iterator block
+ * @const char **tag@ = where to put the tag pointer, or null
+ * @key_data **kd@ = where to put the key data pointer, or null
+ *
+ * Returns: Nonzero if there was another item, zero if we hit the
+ * end-stop.
+ *
+ * Use: Collects the next subkey of a structured key.
+ */
+
+extern int key_nextsubkey(key_subkeyiter */*i*/,
+ const char **/*tag*/, key_data **/*kd*/);
+
+/* --- @key_structset@, @key_structsteal@ --- *
+ *
+ * Arguments: @key_data *k@ = pointer to key data block
+ * @const char *tag@ = pointer to tag string
+ * @key_data *kd@ = new key data to store
+ *
+ * Returns: ---
+ *
+ * Use: Creates a new subkey. Stealing doesn't affect @kd@'s
+ * refcount. If @kd@ is null, the subkey is deleted.
+ */
+
+extern void key_structset(key_data */*k*/,
+ const char */*tag*/, key_data */*kd*/);
+extern void key_structsteal(key_data */*k*/,
+ const char */*tag*/, key_data */*kd*/);
+
+/* --- @key_split@ --- *
+ *
+ * Arguments: @key_data **kk@ = address of pointer to key data block
+ *
+ * Returns: ---
+ *
+ * Use: Replaces @*kk@ with a pointer to the same key data, but with
+ * just one reference.
+ */
+
+extern void key_split(key_data **/*kk*/);
+
+/*----- Miscellaneous operations ------------------------------------------*/
+
+/* --- @key_incref@ --- *
+ *
+ * Arguments: @key_data *k@ = pointer to key data
+ *
+ * Returns: ---
+ *
+ * Use: Increments the refcount on a key data block.
+ */
+
+#define KEY_INCREF(k) ((k)->ref++)
+extern void key_incref(key_data */*k*/);
+
+/* --- @key_destroy@ --- *
+ *
+ * Arguments: @key_data *k@ = pointer to key data to destroy
+ *
+ * Returns: ---
+ *
+ * Use: Destroys a block of key data, regardless of reference count.
+ * Don't use this unless you know what you're doing.
+ */
+
+extern void key_destroy(key_data */*k*/);
+
+/* --- @key_drop@ --- *
+ *
+ * Arguments: @key_data *k@ = pointer to key data to destroy
+ *
+ * Returns: ---
+ *
+ * Use: Drops a reference to key data, destroying it if necessary.
+ */
+
+#define KEY_DROP(k) do { \
+ key_data *_k = k; \
+ _k->ref--; \
+ if (_k->ref == 0) \
+ key_destroy(_k); \
+} while (0)
+
+extern void key_drop(key_data */*k*/);
+
+/* --- @key_do@ --- *
+ *
+ * Arguments: @key_data *k@ = pointer to key data block
+ * @const key_filter *kf@ = pointer to filter block
+ * @dstr *d@ = pointer to base string
+ * @int (*func)(key_data *kd, dstr *d, void *p@ = function
+ * @void *p@ = argument to function
+ *
+ * Returns: Nonzero return code from function, or zero.
+ *
+ * Use: Runs a function over all the leaves of a key.
+ */
+
+extern int key_do(key_data */*k*/, const key_filter */*kf*/, dstr */*d*/,
+ int (*/*func*/)(key_data */*kd*/,
+ dstr */*d*/, void */*p*/),
+ void */*p*/);
+
+/* --- @key_copydata@ --- *
+ *
+ * Arguments: @key_data *k@ = key data to copy
+ * @const key_filter *kf@ = pointer to filter block
+ *
+ * Returns: Pointer to a copy of the data, or null if the root subkey
+ * didn't match the filter.
+ *
+ * Use: Copies a chunk of key data. Subkeys, whether they're
+ * structured or leaves, which don't match the filter aren't
+ * copied. The copy may or may not have structure in common
+ * with the original.
+ */
+
+extern key_data *key_copydata(key_data */*k*/, const key_filter */*kf*/);
+
+/*----- Textual encoding --------------------------------------------------*/
+
+/* --- @key_read@ --- *
+ *
+ * Arguments: @const char *p@ = pointer to textual key representation
+ * @char **pp@ = where to store the end pointer
+ *
+ * Returns: The newly-read key data, or null if it failed.
+ *
+ * Use: Parses a textual key description.
+ */
+
+extern key_data *key_read(const char */*p*/, char **/*pp*/);
+
+/* --- @key_write@ --- *
+ *
+ * Arguments: @key_data *k@ = pointer to key data
+ * @dstr *d@ = destination string to write on
+ * @const key_filter *kf@ = pointer to key selection block
+ *
+ * Returns: Nonzero if any items were actually written.
+ *
+ * Use: Writes a key in a textual encoding.
+ */
+
+extern int key_write(key_data */*k*/, dstr */*d*/, const key_filter */*kf*/);
+
+/*----- Key binary encoding -----------------------------------------------*/
+
+/* --- @key_decode@ --- *
+ *
+ * Arguments: @const void *p@ = pointer to buffer to read
+ * @size_t sz@ = size of the buffer
+ *
+ * Returns: The newly-read key data, or null if it failed.
+ *
+ * Use: Decodes a binary representation of a key.
+ */
+
+extern key_data *key_decode(const void */*p*/, size_t /*sz*/);
+
+/* --- @key_encode@ --- *
+ *
+ * Arguments: @key_data *k@ = pointer to key data block
+ * @dstr *d@ = pointer to destination string
+ * @const key_filter *kf@ = pointer to key selection block
+ *
+ * Returns: Nonzero if any items were actually written.
+ *
+ * Use: Encodes a key block as binary data.
+ */
+
+extern int key_encode(key_data */*k*/, dstr */*d*/,
+ const key_filter */*kf*/);
+
+/*----- Packing and unpacking keys ----------------------------------------*/
+
+/* --- @key_pack@ --- *
+ *
+ * Arguments: @key_packdef *kp@ = pointer to packing structure
+ * @key_data **kd@ = where to put the key data pointer
+ * @dstr *d@ = pointer to tag string for the key data
+ *
+ * Returns: Error code, or zero.
+ *
+ * Use: Packs a key from a data structure.
+ */
+
+extern int key_pack(key_packdef */*kp*/, key_data **/*kd*/, dstr */*d*/);
+
+/* --- @key_unpack@ --- *
+ *
+ * Arguments: @key_packdef *kp@ = pointer to packing structure
+ * @key_data *kd@ = pointer to source key data
+ * @dstr *d@ = pointer to tag string for the key data
+ *
+ * Returns: Error code, or zero.
+ *
+ * Use: Unpacks a key into an appropriate data structure.
+ */
+
+extern int key_unpack(key_packdef */*kp*/, key_data */*kd*/, dstr */*d*/);
+
+/* --- @key_unpackdone@ --- *
+ *
+ * Arguments: @key_packdef *kp@ = pointer to packing definition
+ *
+ * Returns: ---
+ *
+ * Use: Frees the key components contained within a packing
+ * definition, created during key unpacking.
+ */
+
+extern void key_unpackdone(key_packdef */*kp*/);
+
+/*----- Key encryption ----------------------------------------------------*/
+
+/* --- @key_lock@ --- *
+ *
+ * Arguments: @key_data **kt@ = where to store the destination pointer
+ * @key_data *k@ = source key data block or null to use @*kt@
+ * @const void *e@ = secret to encrypt key with
+ * @size_t esz@ = size of the secret
+ *
+ * Returns: ---
+ *
+ * Use: Encrypts a key data block using a secret.
+ */
+
+extern void key_lock(key_data **/*kt*/, key_data */*k*/,
+ const void */*e*/, size_t /*esz*/);
+
+/* --- @key_unlock@ --- *
+ *
+ * Arguments: @key_data **kt@ = where to store the destination pointer
+ * @key_data *k@ = source key data block or null to use @*kt@
+ * @const void *e@ = secret to decrypt the block with
+ * @size_t esz@ = size of the secret
+ *
+ * Returns: Zero for success, or a @KERR_@ error code.
+ *
+ * Use: Unlocks a key using a secret.
+ */
+
+extern int key_unlock(key_data **/*kt*/, key_data */*k*/,
+ const void */*e*/, size_t /*esz*/);
+
+/* --- @key_plock@ --- *
+ *
+ * Arguments: @key_data **kt@ = where to store the destination pointer
+ * @key_data *k@ = source key data block or null to use @*kt@
+ * @const char *tag@ = tag to use for passphrase
+ *
+ * Returns: Zero if successful, a @KERR@ error code on failure.
+ *
+ * Use: Locks a key by encrypting it with a passphrase.
+ */
+
+extern int key_plock(key_data **/*kt*/, key_data */*k*/,
+ const char */*tag*/);
+
+/* --- @key_punlock@ --- *
+ *
+ * Arguments: @key_data **kt@ = where to store the destination pointer
+ * @key_data *k@ = source key data block or null to use @*kt@
+ * @const char *tag@ = tag to use for passphrase
+ *
+ * Returns: Zero if successful, a @KERR@ error code on failure.
+ *
+ * Use: Unlocks a passphrase-locked key.
+ */
+
+extern int key_punlock(key_data **/*kt*/, key_data */*k*/,
+ const char */*tag*/);
+
+/*----- That's all, folks -------------------------------------------------*/
+
+#ifdef __cplusplus
+ }
+#endif
+
+#endif
projects / u / mdw / catacomb / blobdiff