New support for PKCS#1 message encoding.

diff --git a/pkcs1.c b/pkcs1.c
new file mode 100644 (file)
index 0000000..2dbf6de
--- /dev/null
+++ b/pkcs1.c
@@ -0,0 +1,249 @@
+/* -*-c-*-
+ *
+ * $Id: pkcs1.c,v 1.1 2000/07/01 11:17:38 mdw Exp $
+ *
+ * PKCS#1 1.5 packing
+ *
+ * (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: pkcs1.c,v $
+ * Revision 1.1  2000/07/01 11:17:38  mdw
+ * New support for PKCS#1 message encoding.
+ *
+ */
+
+/*----- Header files ------------------------------------------------------*/
+
+#include <string.h>
+
+#include <mLib/bits.h>
+#include <mLib/dstr.h>
+
+#include "grand.h"
+#include "pkcs1.h"
+
+/*----- Main code ---------------------------------------------------------*/
+
+/* --- @pkcs1_cryptencode@ --- *
+ *
+ * Arguments:  @const void *msg@ = pointer to message data
+ *             @size_t msz@ = size of message data
+ *             @void *buf@ = pointer to output buffer
+ *             @size_t sz@ = size of the output buffer
+ *             @void *p@ = pointer to PKCS1 parameter block
+ *
+ * Returns:    Zero if all went well, negative on failure.
+ *
+ * Use:                Implements the operation @EME-PKCS1-V1_5-ENCODE@, as defined
+ *             in PKCS#1 v. 2.0 (RFC2437).
+ */
+
+int pkcs1_cryptencode(const void *msg, size_t msz, void *buf, size_t sz,
+                     void *p)
+{
+  pkcs1 *pp = p;
+  grand *r = pp->r;
+  octet *q, *qq;
+  size_t i, n;
+
+  /* --- Ensure that the buffer is sensibly sized --- */
+
+  if (pp->epsz + msz + 11 > sz)
+    return (-1);
+
+  /* --- Fill in the buffer --- */
+
+  q = buf;
+  qq = q + sz;
+  *q++ = 0;
+  *q++ = 2;
+  n = sz - msz - pp->epsz - 3;
+  r->ops->fill(r, q, n);
+  for (i = 0; i < n; i++) {
+    if (*q == 0)
+      *q = r->ops->range(r, 255) + 1;
+    q++;
+  }
+  *q++ = 0;
+  memcpy(q, pp->ep, pp->epsz);
+  q += pp->epsz;
+  memcpy(q, msg, msz);
+  return (0);
+}
+
+/* --- @pkcs1_cryptdecode@ --- *
+ *
+ * Arguments:  @const void *buf@ = pointer to encoded buffer
+ *             @size_t sz@ = size of the encoded buffer
+ *             @dstr *d@ = pointer to destination string
+ *             @void *p@ = pointer to PKCS1 parameter block
+ *
+ * Returns:    The length of the output string if successful, negative on
+ *             failure.
+ *
+ * Use:                Implements the operation @EME-PKCS1-V1_5-DECODE@, as defined
+ *             in PKCS#1 v. 2.0 (RFC2437).
+ */
+
+int pkcs1_cryptdecode(const void *buf, size_t sz, dstr *d, void *p)
+{
+  pkcs1 *pp = p;
+  const octet *q, *qq;
+  size_t n, i;
+
+  /* --- Check the size of the block looks sane --- */
+
+  if (pp->epsz + 11 > sz)
+    return (-1);
+  q = buf;
+  qq = buf + sz;
+
+  /* --- Ensure that the block looks OK --- */
+
+  if (*q++ != 0 || *q++ != 2)
+    return (-1);
+
+  /* --- Check the nonzero padding --- */
+
+  i = 0;
+  while (*q != 0 && q < qq)
+    i++, q++;
+  if (i < 8 || q == qq)
+    return (-1);
+  q++;
+
+  /* --- Check the encoding parameters --- */
+
+  if (memcmp(q, pp->ep, pp->epsz) != 0)
+    return (-1);
+  q += pp->epsz;
+
+  /* --- Done --- */
+
+  n = qq - q;
+  dstr_putm(d, q, n);
+  return (n);
+}
+
+/* --- @pkcs1_sigencode@ --- *
+ *
+ * Arguments:  @const void *msg@ = pointer to message data
+ *             @size_t msz@ = size of message data
+ *             @void *buf@ = pointer to output buffer
+ *             @size_t sz@ = size of the output buffer
+ *             @void *p@ = pointer to PKCS1 parameter block
+ *
+ * Returns:    Zero if all went well, negative on failure.
+ *
+ * Use:                Implements the operation @EMSA-PKCS1-V1_5-ENCODE@, as defined
+ *             in PKCS#1 v. 2.0 (RFC2437).
+ */
+
+int pkcs1_sigencode(const void *msg, size_t msz, void *buf, size_t sz,
+                     void *p)
+{
+  pkcs1 *pp = p;
+  octet *q, *qq;
+  size_t n;
+
+  /* --- Ensure that the buffer is sensibly sized --- */
+
+  if (pp->epsz + msz + 11 > sz)
+    return (-1);
+
+  /* --- Fill in the buffer --- */
+
+  q = buf;
+  qq = q + sz;
+  *q++ = 0;
+  *q++ = 1;
+  n = sz - msz - pp->epsz - 3;
+  memset(q, 0xff, n);
+  q += n;
+  *q++ = 0;
+  memcpy(q, pp->ep, pp->epsz);
+  q += pp->epsz;
+  memcpy(q, msg, msz);
+  return (0);
+}
+
+/* --- @pkcs1_sigdecode@ --- *
+ *
+ * Arguments:  @const void *buf@ = pointer to encoded buffer
+ *             @size_t sz@ = size of the encoded buffer
+ *             @dstr *d@ = pointer to destination string
+ *             @void *p@ = pointer to PKCS1 parameter block
+ *
+ * Returns:    The length of the output string if successful, negative on
+ *             failure.
+ *
+ * Use:                Implements the operation @EMSA-PKCS1-V1_5-DECODE@, as defined
+ *             in PKCS#1 v. 2.0 (RFC2437).
+ */
+
+int pkcs1_sigdecode(const void *buf, size_t sz, dstr *d, void *p)
+{
+  pkcs1 *pp = p;
+  const octet *q, *qq;
+  size_t i, n;
+
+  /* --- Check the size of the block looks sane --- */
+
+  if (pp->epsz + 10 > sz)
+    return (-1);
+  q = buf;
+  qq = buf + sz;
+
+  /* --- Ensure that the block looks OK --- */
+
+  if (*q++ != 0 || *q++ != 1)
+    return (-1);
+
+  /* --- Check the padding --- */
+
+  i = 0;
+  while (*q == 0xff && q < qq)
+    i++, q++;
+  if (i < 8 || q == qq)
+    return (-1);
+  if (*q != 0)
+    return (-1);
+  q++;
+
+  /* --- Check the encoding parameters --- */
+
+  if (memcmp(q, pp->ep, pp->epsz) != 0)
+    return (-1);
+  q += pp->epsz;
+
+  /* --- Done --- */
+
+  n = qq - q;
+  dstr_putm(d, q, n);
+  return (n);
+}
+
+/*----- That's all, folks -------------------------------------------------*/

diff --git a/pkcs1.h b/pkcs1.h
new file mode 100644 (file)
index 0000000..ff5123f
--- /dev/null
+++ b/pkcs1.h
@@ -0,0 +1,138 @@
+/* -*-c-*-
+ *
+ * $Id: pkcs1.h,v 1.1 2000/07/01 11:17:38 mdw Exp $
+ *
+ * PKCS#1 1.5 packing
+ *
+ * (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: pkcs1.h,v $
+ * Revision 1.1  2000/07/01 11:17:38  mdw
+ * New support for PKCS#1 message encoding.
+ *
+ */
+
+#ifndef CATACOMB_PKCS1_H
+#define CATACOMB_PKCS1_H
+
+#ifdef __cplusplus
+  extern "C" {
+#endif
+
+/*----- Header files ------------------------------------------------------*/
+
+#include <mLib/bits.h>
+#include <mLib/dstr.h>
+
+#ifndef CATACOMB_GRAND_H
+#  include "grand.h"
+#endif
+
+/*----- Data structures ---------------------------------------------------*/
+
+typedef struct pkcs1 {
+  grand *r;                            /* Random number source */
+  const void *ep;                      /* Encoding parameters block */
+  size_t epsz;                         /* Size of the parameter block */
+} pkcs1;
+
+/*----- Functions provided ------------------------------------------------*/
+
+/* --- @pkcs1_cryptencode@ --- *
+ *
+ * Arguments:  @const void *msg@ = pointer to message data
+ *             @size_t msz@ = size of message data
+ *             @void *buf@ = pointer to output buffer
+ *             @size_t sz@ = size of the output buffer
+ *             @void *p@ = pointer to PKCS1 parameter block
+ *
+ * Returns:    Zero if all went well, negative on failure.
+ *
+ * Use:                Implements the operation @EME-PKCS1-V1_5-ENCODE@, as defined
+ *             in PKCS#1 v. 2.0 (RFC2437).
+ */
+
+extern int pkcs1_cryptencode(const void */*msg*/, size_t /*msz*/,
+                            void */*buf*/, size_t /*sz*/, void */*p*/);
+
+/* --- @pkcs1_cryptdecode@ --- *
+ *
+ * Arguments:  @const void *buf@ = pointer to encoded buffer)
+ *             @size_t sz@ = size of the encoded buffer
+ *             @dstr *d@ = pointer to destination string
+ *             @void *p@ = pointer to PKCS1 parameter block
+ *
+ * Returns:    The length of the output string if successful, negative on
+ *             failure.
+ *
+ * Use:                Implements the operation @EME-PKCS1-V1_5-DECODE@, as defined
+ *             in PKCS#1 v. 2.0 (RFC2437).
+ */
+
+extern int pkcs1_cryptdecode(const void */*buf*/, size_t /*sz*/,
+                            dstr */*d*/, void */*p*/);
+
+/* --- @pkcs1_sigencode@ --- *
+ *
+ * Arguments:  @const void *msg@ = pointer to message data
+ *             @size_t msz@ = size of message data
+ *             @void *buf@ = pointer to output buffer
+ *             @size_t sz@ = size of the output buffer
+ *             @void *p@ = pointer to PKCS1 parameter block
+ *
+ * Returns:    Zero if all went well, negative on failure.
+ *
+ * Use:                Implements the operation @EMSA-PKCS1-V1_5-ENCODE@, as defined
+ *             in PKCS#1 v. 2.0 (RFC2437).
+ */
+
+extern int pkcs1_sigencode(const void */*msg*/, size_t /*msz*/,
+                          void */*buf*/, size_t /*sz*/, void */*p*/);
+
+/* --- @pkcs1_sigdecode@ --- *
+ *
+ * Arguments:  @const void *buf@ = pointer to encoded buffer
+ *             @size_t sz@ = size of the encoded buffer
+ *             @dstr *d@ = pointer to destination string
+ *             @void *p@ = pointer to PKCS1 parameter block
+ *
+ * Returns:    The length of the output string if successful, negative on
+ *             failure.
+ *
+ * Use:                Implements the operation @EMSA-PKCS1-V1_5-DECODE@, as defined
+ *             in PKCS#1 v. 2.0 (RFC2437).
+ */
+
+extern int pkcs1_sigdecode(const void */*buf*/, size_t /*sz*/,
+                          dstr */*d*/, void */*p*/);
+
+/*----- That's all, folks -------------------------------------------------*/
+
+#ifdef __cplusplus
+  }
+#endif
+
+#endif