--- /dev/null
+/* -*-c-*-
+ *
+ * $Id: mgf-def.h,v 1.1 2000/06/17 11:33:11 mdw Exp $
+ *
+ * Definitions for the MGF-1 mask generator
+ *
+ * (c) 2000 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.
+ */
+
+/*----- Revision history --------------------------------------------------*
+ *
+ * $Log: mgf-def.h,v $
+ * Revision 1.1 2000/06/17 11:33:11 mdw
+ * MGF-1 support, as defined in PKCS#1.
+ *
+ */
+
+#ifndef CATACOMB_MGF_DEF_H
+#define CATACOMB_MGF_DEF_H
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+/*----- Header files ------------------------------------------------------*/
+
+#include <stdarg.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <mLib/bits.h>
+#include <mLib/sub.h>
+
+#ifndef CATACOMB_ARENA_H
+# include "arena.h"
+#endif
+
+#ifndef CATACOMB_GCIPHER_H
+# include "gcipher.h"
+#endif
+
+#ifndef CATACOMB_GRAND_H
+# include "grand.h"
+#endif
+
+#ifndef CATACOMB_PARANOIA_H
+# include "paranoia.h"
+#endif
+
+/*----- Macros ------------------------------------------------------------*/
+
+#define MGF_DEF(PRE, pre) \
+ \
+/* --- Useful constants --- */ \
+ \
+const octet pre##_mgfkeysz[] = { KSZ_ANY, PRE##_HASHSZ }; \
+ \
+/* --- @pre_mgfkeybegin@, @pre_mgfkeyadd@ --- * \
+ * \
+ * Arguments: @pre_mgfctx *k@ = pointer to context to initialize \
+ * @const void *p@ = pointer to data to contribute \
+ * \
+ * Returns: --- \
+ * \
+ * Use: A multi-step keying procedure for initializing an MGF \
+ * context. The data is contributed to a hashing context \
+ * which is then used for mask generation. If you only \
+ * have a fixed buffer, you can save a lot of effort by \
+ * simply calling @pre_mgfinit@. \
+ */ \
+ \
+void pre##_mgfkeybegin(pre##_mgfctx *k) \
+{ \
+ k->c = 0; \
+ k->bsz = 0; \
+ pre##_init(&k->k); \
+} \
+ \
+void pre##_mgfkeyadd(pre##_mgfctx *k, const void *p, size_t sz) \
+{ \
+ pre##_hash(&k->k, p, sz); \
+} \
+ \
+/* ---- @pre_mgfinit@ --- * \
+ * \
+ * Arguments: @pre_mgfctx *k@ = pointer to context to initialize \
+ * @const void *p@ = pointer to data to contribute \
+ * @size_t sz@ = size of data to contribute \
+ * \
+ * Returns: --- \
+ * \
+ * Use: A simpler interface to initialization if all of your \
+ * keying material is in one place. \
+ */ \
+ \
+void pre##_mgfinit(pre##_mgfctx *k, const void *p, size_t sz) \
+{ \
+ k->c = 0; \
+ k->bsz = 0; \
+ pre##_init(&k->k); \
+ pre##_hash(&k->k, p, sz); \
+} \
+ \
+/* --- @pre_mgfencrypt@ --- * \
+ * \
+ * Arguments: @pre_mgfctx *k@ = pointer to masking context \
+ * @const void *s@ = pointer to source buffer \
+ * @void *d@ = pointer to destination buffer \
+ * @size_t sz@ = size of buffers \
+ * \
+ * Returns: --- \
+ * \
+ * Use: Outputs pseudorandom data, or masks an input buffer. \
+ * \
+ * If @s@ is nonzero, the source material is exclusive- \
+ * orred with the generated mask. If @d@ is zero, the \
+ * generator is simply spun around for a while, which \
+ * isn't very useful. \
+ */ \
+ \
+void pre##_mgfencrypt(pre##_mgfctx *k, const void *s, \
+ void *d, size_t sz) \
+{ \
+ const octet *ss = s; \
+ octet *dd = d; \
+ \
+ /* --- Empty the buffer if there's anything there --- */ \
+ \
+ if (k->bsz) { \
+ const octet *p = k->buf + PRE##_HASHSZ - k->bsz; \
+ size_t n = sz > k->bsz ? k->bsz : sz; \
+ sz -= n; \
+ k->bsz -= n; \
+ if (dd) { \
+ if (!ss) { \
+ memcpy(dd, p, n); \
+ dd += n; \
+ } else { \
+ while (n) { \
+ *dd++ = *ss++ ^ *p++; \
+ n--; \
+ } \
+ } \
+ } \
+ } \
+ \
+ /* --- While necessary, generate some more mask --- */ \
+ \
+ while (sz) { \
+ pre##_ctx c = k->k; /* Not quick! */ \
+ size_t n; \
+ \
+ STORE32(k->buf, k->c); \
+ k->c++; \
+ pre##_hash(&c, k->buf, 4); \
+ pre##_done(&c, k->buf); \
+ n = sz > PRE##_HASHSZ ? PRE##_HASHSZ : sz; \
+ k->bsz = PRE##_HASHSZ - n; \
+ sz -= n; \
+ if (dd) { \
+ const octet *p = k->buf; \
+ if (!ss) { \
+ memcpy(dd, p, n); \
+ dd += n; \
+ } else { \
+ while (n) { \
+ *dd++ = *ss++ ^ *p++; \
+ n--; \
+ } \
+ } \
+ } \
+ } \
+} \
+ \
+/* --- @pre_mgfsetindex@ --- * \
+ * \
+ * Arguments: @pre_mgfctx *k@ = pointer to masking context \
+ * @uint32 *c@ = new index to set \
+ * \
+ * Returns: --- \
+ * \
+ * Use: Sets a new index. This may be used to step around the \
+ * output stream in a rather crude way. \
+ */ \
+ \
+void pre##_mgfsetindex(pre##_mgfctx *k, uint32 c) \
+{ \
+ k->c = c; \
+ k->bsz = 0; \
+} \
+ \
+/* --- Generic cipher interface --- */ \
+ \
+static const gcipher_ops gops; \
+ \
+typedef struct gctx { \
+ gcipher c; \
+ pre##_mgfctx k; \
+} gctx; \
+ \
+static gcipher *ginit(const void *k, size_t sz) \
+{ \
+ gctx *g = S_CREATE(gctx); \
+ g->c.ops = &gops; \
+ pre##_mgfinit(&g->k, k, sz); \
+ return (&g->c); \
+} \
+ \
+static void gencrypt(gcipher *c, const void *s, void *t, size_t sz) \
+{ \
+ gctx *g = (gctx *)c; \
+ pre##_mgfencrypt(&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##_mgf, \
+ gencrypt, gencrypt, gdestroy, 0, 0 \
+}; \
+ \
+const gccipher pre##_mgf = { \
+ #pre "-mgf", pre##_mgfkeysz, 0, \
+ ginit \
+}; \
+ \
+/* --- Generic random number generator interface --- */ \
+ \
+typedef struct grctx { \
+ grand r; \
+ pre##_mgfctx k; \
+} grctx; \
+ \
+static void grdestroy(grand *r) \
+{ \
+ grctx *g = (grctx *)r; \
+ BURN(*g); \
+ S_DESTROY(g); \
+} \
+ \
+static int grmisc(grand *r, unsigned op, ...) \
+{ \
+ grctx *g = (grctx *)r; \
+ va_list ap; \
+ int rc = 0; \
+ va_start(ap, op); \
+ \
+ switch (op) { \
+ case GRAND_CHECK: \
+ switch (va_arg(ap, unsigned)) { \
+ case GRAND_CHECK: \
+ case GRAND_SEEDINT: \
+ case GRAND_SEEDUINT32: \
+ case GRAND_SEEDBLOCK: \
+ case GRAND_SEEDRAND: \
+ rc = 1; \
+ break; \
+ default: \
+ rc = 0; \
+ break; \
+ } \
+ break; \
+ case GRAND_SEEDINT: \
+ pre##_mgfsetindex(&g->k, va_arg(ap, unsigned)); \
+ break; \
+ case GRAND_SEEDUINT32: \
+ pre##_mgfsetindex(&g->k, va_arg(ap, uint32)); \
+ break; \
+ case GRAND_SEEDBLOCK: { \
+ const void *p = va_arg(ap, const void *); \
+ size_t sz = va_arg(ap, size_t); \
+ pre##_hash(&g->k.k, p, sz); \
+ } break; \
+ case GRAND_SEEDRAND: { \
+ octet buf[PRE##_BUFSZ]; \
+ grand *rr = va_arg(ap, grand *); \
+ rr->ops->fill(rr, buf, sizeof(buf)); \
+ pre##_hash(&g->k.k, buf, sizeof(buf)); \
+ } break; \
+ default: \
+ GRAND_BADOP; \
+ break; \
+ } \
+ \
+ va_end(ap); \
+ return (rc); \
+} \
+ \
+static octet grbyte(grand *r) \
+{ \
+ grctx *g = (grctx *)r; \
+ octet o; \
+ pre##_mgfencrypt(&g->k, 0, &o, 1); \
+ return (o); \
+} \
+ \
+static uint32 grword(grand *r) \
+{ \
+ grctx *g = (grctx *)r; \
+ octet b[4]; \
+ pre##_mgfencrypt(&g->k, 0, b, sizeof(b)); \
+ return (LOAD32(b)); \
+} \
+ \
+static void grfill(grand *r, void *p, size_t sz) \
+{ \
+ grctx *g = (grctx *)r; \
+ pre##_mgfencrypt(&g->k, 0, p, sz); \
+} \
+ \
+static const grand_ops grops = { \
+ #pre "-mgf", \
+ GRAND_CRYPTO, 0, \
+ grmisc, grdestroy, \
+ grword, grbyte, grword, grand_range, grfill \
+}; \
+ \
+/* --- @pre_mgfrand@ --- * \
+ * \
+ * Arguments: @const void *k@ = pointer to key material \
+ * @size_t sz@ = size of key material \
+ * \
+ * Returns: Pointer to a generic random number generator instance. \
+ * \
+ * Use: Creates a random number interface wrapper around an \
+ * MGF-1-mode hash function. \
+ */ \
+ \
+extern grand *pre##_mgfrand(const void *k, size_t sz) \
+{ \
+ grctx *g = S_CREATE(grctx); \
+ g->r.ops = &grops; \
+ pre##_mgfinit(&g->k, k, sz); \
+ return (&g->r); \
+} \
+ \
+MGF_TEST(PRE, pre)
+
+/*----- Test rig ----------------------------------------------------------*/
+
+#ifdef TEST_RIG
+
+#include <stdio.h>
+
+#include "daftstory.h"
+
+/* --- @MGF_TEST@ --- *
+ *
+ * Arguments: @PRE@, @pre@ = prefixes for block cipher definitions
+ *
+ * Use: Standard test rig for MGF functions.
+ */
+
+#define MGF_TEST(PRE, pre) \
+ \
+/* --- Initial plaintext for the test --- */ \
+ \
+static const octet text[] = TEXT; \
+ \
+/* --- Key and IV to use --- */ \
+ \
+static const octet key[] = KEY; \
+ \
+/* --- 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##_HASHSZ == 0) \
+ putchar(':'); \
+ } \
+} \
+ \
+int main(void) \
+{ \
+ size_t sz = 0, rest; \
+ pre##_mgfctx ctx; \
+ int status = 0; \
+ int done = 0; \
+ \
+ size_t keysz = strlen((const char *)key); \
+ \
+ fputs(#pre "-mgf: ", stdout); \
+ \
+ pre##_mgfinit(&ctx, key, keysz); \
+ \
+ while (sz <= sizeof(text)) { \
+ rest = sizeof(text) - sz; \
+ memcpy(ct, text, sizeof(text)); \
+ pre##_mgfsetindex(&ctx, 0); \
+ pre##_mgfencrypt(&ctx, ct, ct, sz); \
+ pre##_mgfencrypt(&ctx, ct + sz, ct + sz, rest); \
+ memcpy(pt, ct, sizeof(text)); \
+ pre##_mgfsetindex(&ctx, 0); \
+ pre##_mgfencrypt(&ctx, pt, pt, rest); \
+ pre##_mgfencrypt(&ctx, pt + rest, pt + rest, sz); \
+ 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); \
+ } \
+ if (sz < 63) \
+ sz++; \
+ else \
+ sz += 9; \
+ } \
+ \
+ fputs(status ? " failed\n" : " ok\n", stdout); \
+ return (status); \
+}
+
+#else
+# define MGF_TEST(PRE, pre)
+#endif
+
+/*----- That's all, folks -------------------------------------------------*/
+
+#ifdef __cplusplus
+ }
+#endif
+
+#endif
--- /dev/null
+/* -*-c-*-
+ *
+ * $Id: mgf.h,v 1.1 2000/06/17 11:33:11 mdw Exp $
+ *
+ * The MGF mask generation function
+ *
+ * (c) 2000 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.
+ */
+
+/*----- Revision history --------------------------------------------------*
+ *
+ * $Log: mgf.h,v $
+ * Revision 1.1 2000/06/17 11:33:11 mdw
+ * MGF-1 support, as defined in PKCS#1.
+ *
+ */
+
+/*----- Notes on the MGF-1 mask generating function -----------------------*
+ *
+ * The idea of a mask-generating function is that given an input of arbitrary
+ * size, it can emit a pseudorandom output `mask' of arbitrary size. This is
+ * used in PKCS#1 OAEP (RFC2437). My recommendation would be to use a decent
+ * stream cipher instead, like RC4 or SEAL. MGF-1 isn't very fast.
+ */
+
+#ifndef CATACOMB_MGF_H
+#define CATACOMB_MGF_H
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+/*----- Header files ------------------------------------------------------*/
+
+#include <mLib/bits.h>
+
+#ifndef CATACOMB_GCIPHER_H
+# include "gcipher.h"
+#endif
+
+#ifndef CATACOMB_GRAND_H
+# include "grand.h"
+#endif
+
+/*----- Macros ------------------------------------------------------------*/
+
+#define MGF_DECL(PRE, pre) \
+ \
+/* --- An MGF generation context --- */ \
+ \
+typedef struct pre##_mgfctx { \
+ pre##_ctx k; /* Underlying key context */ \
+ uint32 c; /* Counter */ \
+ octet buf[PRE##_HASHSZ]; /* Output buffer */ \
+ size_t bsz; /* Size of buffered data */ \
+} pre##_mgfctx; \
+ \
+/* --- Other useful constants --- */ \
+ \
+extern const octet pre##_mgfkeysz[]; \
+ \
+/* --- @pre_mgfkeybegin@, @pre_mgfkeyadd@ --- * \
+ * \
+ * Arguments: @pre_mgfctx *k@ = pointer to context to initialize \
+ * @const void *p@ = pointer to data to contribute \
+ * @size_t sz@ = size of data to contribute \
+ * \
+ * Returns: --- \
+ * \
+ * Use: A multi-step keying procedure for initializing an MGF \
+ * context. The data is contributed to a hashing context \
+ * which is then used for mask generation. If you only \
+ * have a fixed buffer, you can save a lot of effort by \
+ * simply calling @pre_mgfinit@. \
+ */ \
+ \
+extern void pre##_mgfkeybegin(pre##_mgfctx */*k*/); \
+extern void pre##_mgfkeyadd(pre##_mgfctx */*k*/, \
+ const void */*p*/, size_t /*sz*/); \
+ \
+/* ---- @pre_mgfinit@ --- * \
+ * \
+ * Arguments: @pre_mgfctx *k@ = pointer to context to initialize \
+ * @const void *p@ = pointer to data to contribute \
+ * @size_t sz@ = size of data to contribute \
+ * \
+ * Returns: --- \
+ * \
+ * Use: A simpler interface to initialization if all of your \
+ * keying material is in one place. \
+ */ \
+ \
+extern void pre##_mgfinit(pre##_mgfctx */*k*/, \
+ const void */*p*/, size_t /*sz*/); \
+ \
+/* --- @pre_mgfencrypt@ --- * \
+ * \
+ * Arguments: @pre_mgfctx *k@ = pointer to masking context \
+ * @const void *s@ = pointer to source buffer \
+ * @void *d@ = pointer to destination buffer \
+ * @size_t sz@ = size of buffers \
+ * \
+ * Returns: --- \
+ * \
+ * Use: Outputs pseudorandom data, or masks an input buffer. \
+ * \
+ * If @s@ is nonzero, the source material is exclusive- \
+ * orred with the generated mask. If @d@ is zero, the \
+ * generator is simply spun around for a while, which \
+ * isn't very useful. \
+ */ \
+ \
+extern void pre##_mgfencrypt(pre##_mgfctx */*k*/, const void */*s*/, \
+ void */*d*/, size_t /*sz*/); \
+ \
+/* --- @pre_mgfsetindex@ --- * \
+ * \
+ * Arguments: @pre_mgfctx *k@ = pointer to masking context \
+ * @uint32 *c@ = new index to set \
+ * \
+ * Returns: --- \
+ * \
+ * Use: Sets a new index. This may be used to step around the \
+ * output stream in a rather crude way. \
+ */ \
+ \
+extern void pre##_mgfsetindex(pre##_mgfctx */*k*/, uint32 /*c*/); \
+ \
+/* --- @pre_mgfrand@ --- * \
+ * \
+ * Arguments: @const void *k@ = pointer to key material \
+ * @size_t sz@ = size of key material \
+ * \
+ * Returns: Pointer to a generic random number generator instance. \
+ * \
+ * Use: Creates a random number interface wrapper around an \
+ * MGF-1-mode hash function. \
+ */ \
+ \
+extern grand *pre##_mgfrand(const void */*k*/, size_t /*sz*/); \
+ \
+/* --- Generic cipher interface --- */ \
+ \
+extern const gccipher pre##_mgf;
+
+/*----- That's all, folks -------------------------------------------------*/
+
+#ifdef __cplusplus
+ }
+#endif
+
+#endif
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