--- /dev/null
+/* -*-c-*-
+ *
+ * Definitions electronic code book mode
+ *
+ * (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_ECB_DEF_H
+#define CATACOMB_ECB_DEF_H
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+/*----- Header files ------------------------------------------------------*/
+
+#include <assert.h>
+#include <string.h>
+
+#include <mLib/bits.h>
+#include <mLib/sub.h>
+
+#ifndef CATACOMB_ARENA_H
+# include "arena.h"
+#endif
+
+#ifndef CATACOMB_BLKC_H
+# include "blkc.h"
+#endif
+
+#ifndef CATACOMB_GCIPHER_H
+# include "gcipher.h"
+#endif
+
+#ifndef CATACOMB_PARANOIA_H
+# include "paranoia.h"
+#endif
+
+/*----- Macros ------------------------------------------------------------*/
+
+/* --- @ECB_DEF@ --- *
+ *
+ * Arguments: @PRE@, @pre@ = prefixes for the underlying block cipher
+ *
+ * Use: Creates an implementation for ECB stealing mode.
+ */
+
+#define ECB_DEF(PRE, pre) \
+ \
+/* --- @pre_ecbsetkey@ --- * \
+ * \
+ * Arguments: @pre_ecbctx *ctx@ = pointer to ECB context block \
+ * @const pre_ctx *k@ = pointer to cipher context \
+ * \
+ * Returns: --- \
+ * \
+ * Use: Sets the ECB context to use a different cipher key. \
+ */ \
+ \
+void pre##_ecbsetkey(pre##_ecbctx *ctx, const pre##_ctx *k) \
+{ \
+ ctx->ctx = *k; \
+} \
+ \
+/* --- @pre_ecbinit@ --- * \
+ * \
+ * Arguments: @pre_ecbctx *ctx@ = pointer to cipher context \
+ * @const void *key@ = pointer to the key buffer \
+ * @size_t sz@ = size of the key \
+ * @const void *iv@ = pointer to initialization vector \
+ * \
+ * Returns: --- \
+ * \
+ * Use: Initializes an ECB context ready for use. This is \
+ * equivalent to calls to @pre_init@ and @pre_setkey@. \
+ */ \
+ \
+void pre##_ecbinit(pre##_ecbctx *ctx, \
+ const void *key, size_t sz, \
+ const void *iv) \
+{ \
+ pre##_init(&ctx->ctx, key, sz); \
+} \
+ \
+/* --- @pre_ecbencrypt@ --- * \
+ * \
+ * Arguments: @pre_ecbctx *ctx@ = pointer to ECB context block \
+ * @const void *src@ = pointer to source data \
+ * @void *dest@ = pointer to destination data \
+ * @size_t sz@ = size of block to be encrypted \
+ * \
+ * Returns: --- \
+ * \
+ * Use: Encrypts a block with a block cipher in ECB mode, with \
+ * ciphertext stealing and other clever tricks. \
+ * Essentially, data can be encrypted in arbitrary sized \
+ * chunks, although decryption must use the same chunks. \
+ */ \
+ \
+void pre##_ecbencrypt(pre##_ecbctx *ctx, \
+ const void *src, void *dest, \
+ size_t sz) \
+{ \
+ const octet *s = src; \
+ octet *d = dest; \
+ \
+ /* --- Empty blocks are trivial --- */ \
+ \
+ if (!sz) \
+ return; \
+ \
+ /* --- Short blocks aren't allowed in ECB --- * \
+ * \
+ * There's absolutely nothing secure I can do with them. \
+ */ \
+ \
+ assert(((void)"ECB must have at least one whole block to work with", \
+ sz >= PRE##_BLKSZ)); \
+ \
+ /* --- Do the main chunk of encryption --- * \
+ * \
+ * This will do the whole lot if it's a whole number of blocks. Just \
+ * give each block to the cipher in turn. This is trivial. \
+ * Hopefully... \
+ */ \
+ \
+ while (sz >= 2 * PRE##_BLKSZ || sz == PRE##_BLKSZ) { \
+ uint32 x[PRE##_BLKSZ / 4]; \
+ if (!s) \
+ BLKC_ZERO(PRE, x); \
+ else { \
+ BLKC_LOAD(PRE, x, s); \
+ s += PRE##_BLKSZ; \
+ } \
+ pre##_eblk(&ctx->ctx, x, x); \
+ if (d) { \
+ BLKC_STORE(PRE, d, x); \
+ d += PRE##_BLKSZ; \
+ } \
+ sz -= PRE##_BLKSZ; \
+ } \
+ \
+ /* --- Do the tail-end block and bit-left-over --- * \
+ * \
+ * This isn't very efficient. That shouldn't matter much. \
+ */ \
+ \
+ if (sz) { \
+ uint32 x[PRE##_BLKSZ / 4]; \
+ octet b[PRE##_BLKSZ]; \
+ unsigned i; \
+ \
+ /* --- Let @sz@ be the size of the partial block --- */ \
+ \
+ sz -= PRE##_BLKSZ; \
+ \
+ /* --- First stage --- * \
+ * \
+ * Read in the current block, and encrypt it. The first part of \
+ * the result is the partial ciphertext block. Don't write that \
+ * out yet, because I've not read the partial plaintext block. \
+ */ \
+ \
+ if (!s) \
+ BLKC_ZERO(PRE, x); \
+ else { \
+ BLKC_LOAD(PRE, x, s); \
+ s += PRE##_BLKSZ; \
+ } \
+ pre##_eblk(&ctx->ctx, x, x); \
+ BLKC_STORE(PRE, b, x); \
+ \
+ /* --- Second stage --- * \
+ * \
+ * Now move in the partial plaintext block, writing out the \
+ * ciphertext as I go. Then encrypt, and write the complete \
+ * ciphertext block. \
+ */ \
+ \
+ if (d) d += PRE##_BLKSZ; \
+ for (i = 0; i < sz; i++) { \
+ register octet y = b[i]; \
+ b[i] = s[i]; \
+ if (d) d[i] = y; \
+ } \
+ BLKC_LOAD(PRE, x, b); \
+ pre##_eblk(&ctx->ctx, x, x); \
+ if (d) BLKC_STORE(PRE, d - PRE##_BLKSZ, x); \
+ } \
+ \
+ /* --- Done --- */ \
+ \
+ return; \
+} \
+ \
+/* --- @pre_ecbdecrypt@ --- * \
+ * \
+ * Arguments: @pre_ecbctx *ctx@ = pointer to ECB context block \
+ * @const void *src@ = pointer to source data \
+ * @void *dest@ = pointer to destination data \
+ * @size_t sz@ = size of block to be encrypted \
+ * \
+ * Returns: --- \
+ * \
+ * Use: Decrypts a block with a block cipher in ECB mode, with \
+ * ciphertext stealing and other clever tricks. \
+ * Essentially, data can be encrypted in arbitrary sized \
+ * chunks, although decryption must use the same chunks. \
+ */ \
+ \
+void pre##_ecbdecrypt(pre##_ecbctx *ctx, \
+ const void *src, void *dest, \
+ size_t sz) \
+{ \
+ const octet *s = src; \
+ octet *d = dest; \
+ \
+ /* --- Empty blocks are trivial --- */ \
+ \
+ if (!sz) \
+ return; \
+ \
+ /* --- Short blocks aren't allowed in ECB --- * \
+ * \
+ * There's absolutely nothing secure I can do with them. \
+ */ \
+ \
+ assert(((void)"ECB must have at least one whole block to work with", \
+ sz >= PRE##_BLKSZ)); \
+ \
+ /* --- Do the main chunk of decryption --- * \
+ * \
+ * This will do the whole lot if it's a whole number of blocks. \
+ * Each block is just handed to the block cipher in turn. \
+ */ \
+ \
+ while (sz >= 2 * PRE##_BLKSZ || sz == PRE##_BLKSZ) { \
+ uint32 x[PRE##_BLKSZ / 4]; \
+ BLKC_LOAD(PRE, x, s); \
+ pre##_dblk(&ctx->ctx, x, x); \
+ BLKC_STORE(PRE, d, x); \
+ s += PRE##_BLKSZ; \
+ d += PRE##_BLKSZ; \
+ sz -= PRE##_BLKSZ; \
+ } \
+ \
+ /* --- Do the tail-end block and bit-left-over --- * \
+ * \
+ * This isn't very efficient. That shouldn't matter much. \
+ */ \
+ \
+ if (sz) { \
+ uint32 x[PRE##_BLKSZ / 4]; \
+ octet b[PRE##_BLKSZ]; \
+ unsigned i; \
+ \
+ /* --- Let @sz@ be the size of the partial block --- */ \
+ \
+ sz -= PRE##_BLKSZ; \
+ \
+ /* --- First stage --- * \
+ * \
+ * Take the complete ciphertext block, and decrypt it. This block \
+ * is carried over for the next encryption operation. \
+ */ \
+ \
+ BLKC_LOAD(PRE, x, s); \
+ pre##_dblk(&ctx->ctx, x, x); \
+ BLKC_STORE(PRE, b, x); \
+ \
+ /* --- Second stage --- * \
+ * \
+ * The first few bytes are the partial plaintext block. Write that \
+ * and replace with the partial ciphertext block. Then decrypt \
+ * what's left as the complete plaintext. \
+ */ \
+ \
+ s += PRE##_BLKSZ; \
+ d += PRE##_BLKSZ; \
+ for (i = 0; i < sz; i++) { \
+ register octet y = s[i]; \
+ d[i] = b[i]; \
+ b[i] = y; \
+ } \
+ BLKC_LOAD(PRE, x, b); \
+ pre##_dblk(&ctx->ctx, x, x); \
+ BLKC_STORE(PRE, d - PRE##_BLKSZ, x); \
+ } \
+ \
+ /* --- Done --- */ \
+ \
+ return; \
+} \
+ \
+/* --- Generic cipher interface --- */ \
+ \
+static const gcipher_ops gops; \
+ \
+typedef struct gctx { \
+ gcipher c; \
+ pre##_ecbctx k; \
+} gctx; \
+ \
+static gcipher *ginit(const void *k, size_t sz) \
+{ \
+ gctx *g = S_CREATE(gctx); \
+ g->c.ops = &gops; \
+ pre##_ecbinit(&g->k, k, sz, 0); \
+ return (&g->c); \
+} \
+ \
+static void gencrypt(gcipher *c, const void *s, void *t, size_t sz) \
+{ \
+ gctx *g = (gctx *)c; \
+ pre##_ecbencrypt(&g->k, s, t, sz); \
+} \
+ \
+static void gdecrypt(gcipher *c, const void *s, void *t, size_t sz) \
+{ \
+ gctx *g = (gctx *)c; \
+ pre##_ecbdecrypt(&g->k, s, t, sz); \
+} \
+ \
+static void gdestroy(gcipher *c) \
+{ \
+ gctx *g = (gctx *)c; \
+ BURN(*g); \
+ S_DESTROY(g); \
+} \
+ \
+static const gcipher_ops gops = { \
+ &pre##_ecb, \
+ gencrypt, gdecrypt, gdestroy, 0, 0 \
+}; \
+ \
+const gccipher pre##_ecb = { \
+ #pre "-ecb", pre##_keysz, PRE##_BLKSZ, \
+ ginit \
+}; \
+ \
+ECB_TEST(PRE, pre)
+
+/*----- Test rig ----------------------------------------------------------*/
+
+#ifdef TEST_RIG
+
+#include <stdio.h>
+
+#include "daftstory.h"
+
+/* --- @ECB_TEST@ --- *
+ *
+ * Arguments: @PRE@, @pre@ = prefixes for block cipher definitions
+ *
+ * Use: Standard test rig for ECB functions.
+ */
+
+#define ECB_TEST(PRE, pre) \
+ \
+/* --- Initial plaintext for the test --- */ \
+ \
+static const octet text[] = TEXT; \
+ \
+/* --- Key and IV to use --- */ \
+ \
+static const octet key[] = KEY; \
+static const octet iv[] = IV; \
+ \
+/* --- Buffers for encryption and decryption output --- */ \
+ \
+static octet ct[sizeof(text)]; \
+static octet pt[sizeof(text)]; \
+ \
+static void hexdump(const octet *p, size_t sz) \
+{ \
+ const octet *q = p + sz; \
+ for (sz = 0; p < q; p++, sz++) { \
+ printf("%02x", *p); \
+ if ((sz + 1) % PRE##_BLKSZ == 0) \
+ putchar(':'); \
+ } \
+} \
+ \
+int main(void) \
+{ \
+ size_t sz = 0, rest; \
+ pre##_ecbctx ctx; \
+ int status = 0; \
+ int done = 0; \
+ \
+ size_t keysz = PRE##_KEYSZ ? \
+ PRE##_KEYSZ : strlen((const char *)key); \
+ \
+ fputs(#pre "-ecb: ", stdout); \
+ \
+ pre##_ecbinit(&ctx, key, keysz, iv); \
+ \
+ while (sz <= sizeof(text)) { \
+ rest = sizeof(text) - sz; \
+ if ((sz != 0 && sz < PRE##_BLKSZ) || \
+ (rest != 0 && rest < PRE##_BLKSZ)) \
+ goto next; \
+ memcpy(ct, text, sizeof(text)); \
+ pre##_ecbencrypt(&ctx, ct, ct, sz); \
+ pre##_ecbencrypt(&ctx, ct + sz, ct + sz, rest); \
+ memcpy(pt, ct, sizeof(text)); \
+ pre##_ecbdecrypt(&ctx, pt, pt, sz); \
+ pre##_ecbdecrypt(&ctx, pt + sz, pt + sz, rest); \
+ if (memcmp(pt, text, sizeof(text)) == 0) { \
+ done++; \
+ if (sizeof(text) < 40 || done % 8 == 0) \
+ fputc('.', stdout); \
+ if (done % 480 == 0) \
+ fputs("\n\t", stdout); \
+ fflush(stdout); \
+ } else { \
+ printf("\nError (sz = %lu)\n", (unsigned long)sz); \
+ status = 1; \
+ printf("\tplaintext = "); hexdump(text, sz); \
+ printf(", "); hexdump(text + sz, rest); \
+ fputc('\n', stdout); \
+ printf("\tciphertext = "); hexdump(ct, sz); \
+ printf(", "); hexdump(ct + sz, rest); \
+ fputc('\n', stdout); \
+ printf("\trecovered text = "); hexdump(pt, sz); \
+ printf(", "); hexdump(pt + sz, rest); \
+ fputc('\n', stdout); \
+ fputc('\n', stdout); \
+ } \
+ next: \
+ if (sz < 63) \
+ sz++; \
+ else \
+ sz += 9; \
+ } \
+ \
+ fputs(status ? " failed\n" : " ok\n", stdout); \
+ return (status); \
+}
+
+#else
+# define ECB_TEST(PRE, pre)
+#endif
+
+/*----- That's all, folks -------------------------------------------------*/
+
+#ifdef __cplusplus
+ }
+#endif
+
+#endif
projects / u / mdw / catacomb / blobdiff