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-rw-r--r--libotr/libgcrypt-1.8.7/cipher/gost28147.c227
1 files changed, 227 insertions, 0 deletions
diff --git a/libotr/libgcrypt-1.8.7/cipher/gost28147.c b/libotr/libgcrypt-1.8.7/cipher/gost28147.c
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index 0000000..4ff80b4
--- /dev/null
+++ b/libotr/libgcrypt-1.8.7/cipher/gost28147.c
@@ -0,0 +1,227 @@
+/* gost28147.c - GOST 28147-89 implementation for Libgcrypt
+ * Copyright (C) 2012 Free Software Foundation, Inc.
+ *
+ * This file is part of Libgcrypt.
+ *
+ * Libgcrypt is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * Libgcrypt 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+/* GOST 28147-89 defines several modes of encryption:
+ * - ECB which should be used only for key transfer
+ * - CFB mode
+ * - OFB-like mode with additional transformation on keystream
+ *   RFC 5830 names this 'counter encryption' mode
+ *   Original GOST text uses the term 'gammirovanie'
+ * - MAC mode
+ *
+ * This implementation handles ECB and CFB modes via usual libgcrypt handling.
+ * OFB-like and MAC modes are unsupported.
+ */
+
+#include <config.h>
+#include "types.h"
+#include "g10lib.h"
+#include "cipher.h"
+#include "bufhelp.h"
+
+#include "gost.h"
+#include "gost-sb.h"
+
+static gcry_err_code_t
+gost_setkey (void *c, const byte *key, unsigned keylen)
+{
+  int i;
+  GOST28147_context *ctx = c;
+
+  if (keylen != 256 / 8)
+    return GPG_ERR_INV_KEYLEN;
+
+  if (!ctx->sbox)
+    ctx->sbox = sbox_test_3411;
+
+  for (i = 0; i < 8; i++)
+    {
+      ctx->key[i] = buf_get_le32(&key[4*i]);
+    }
+  return GPG_ERR_NO_ERROR;
+}
+
+static u32
+gost_val (GOST28147_context *ctx, u32 cm1, int subkey)
+{
+  cm1 += ctx->key[subkey];
+  cm1 = ctx->sbox[0*256 + ((cm1 >>  0) & 0xff)] |
+        ctx->sbox[1*256 + ((cm1 >>  8) & 0xff)] |
+        ctx->sbox[2*256 + ((cm1 >> 16) & 0xff)] |
+        ctx->sbox[3*256 + ((cm1 >> 24) & 0xff)];
+  return cm1;
+}
+
+static unsigned int
+_gost_encrypt_data (void *c, u32 *o1, u32 *o2, u32 n1, u32 n2)
+{
+  GOST28147_context *ctx = c;
+
+  n2 ^= gost_val (ctx, n1, 0); n1 ^= gost_val (ctx, n2, 1);
+  n2 ^= gost_val (ctx, n1, 2); n1 ^= gost_val (ctx, n2, 3);
+  n2 ^= gost_val (ctx, n1, 4); n1 ^= gost_val (ctx, n2, 5);
+  n2 ^= gost_val (ctx, n1, 6); n1 ^= gost_val (ctx, n2, 7);
+
+  n2 ^= gost_val (ctx, n1, 0); n1 ^= gost_val (ctx, n2, 1);
+  n2 ^= gost_val (ctx, n1, 2); n1 ^= gost_val (ctx, n2, 3);
+  n2 ^= gost_val (ctx, n1, 4); n1 ^= gost_val (ctx, n2, 5);
+  n2 ^= gost_val (ctx, n1, 6); n1 ^= gost_val (ctx, n2, 7);
+
+  n2 ^= gost_val (ctx, n1, 0); n1 ^= gost_val (ctx, n2, 1);
+  n2 ^= gost_val (ctx, n1, 2); n1 ^= gost_val (ctx, n2, 3);
+  n2 ^= gost_val (ctx, n1, 4); n1 ^= gost_val (ctx, n2, 5);
+  n2 ^= gost_val (ctx, n1, 6); n1 ^= gost_val (ctx, n2, 7);
+
+  n2 ^= gost_val (ctx, n1, 7); n1 ^= gost_val (ctx, n2, 6);
+  n2 ^= gost_val (ctx, n1, 5); n1 ^= gost_val (ctx, n2, 4);
+  n2 ^= gost_val (ctx, n1, 3); n1 ^= gost_val (ctx, n2, 2);
+  n2 ^= gost_val (ctx, n1, 1); n1 ^= gost_val (ctx, n2, 0);
+
+  *o1 = n2;
+  *o2 = n1;
+
+  return /* burn_stack */ 4*sizeof(void*) /* func call */ +
+                          3*sizeof(void*) /* stack */ +
+                          4*sizeof(void*) /* gost_val call */;
+}
+
+static unsigned int
+gost_encrypt_block (void *c, byte *outbuf, const byte *inbuf)
+{
+  GOST28147_context *ctx = c;
+  u32 n1, n2;
+  unsigned int burn;
+
+  n1 = buf_get_le32 (inbuf);
+  n2 = buf_get_le32 (inbuf+4);
+
+  burn = _gost_encrypt_data(ctx, &n1, &n2, n1, n2);
+
+  buf_put_le32 (outbuf+0, n1);
+  buf_put_le32 (outbuf+4, n2);
+
+  return /* burn_stack */ burn + 6*sizeof(void*) /* func call */;
+}
+
+unsigned int _gcry_gost_enc_data (GOST28147_context *c, const u32 *key,
+    u32 *o1, u32 *o2, u32 n1, u32 n2, int cryptopro)
+{
+  if (cryptopro)
+    c->sbox = sbox_CryptoPro_3411;
+  else
+    c->sbox = sbox_test_3411;
+  memcpy (c->key, key, 8*4);
+  return _gost_encrypt_data (c, o1, o2, n1, n2) + 7 * sizeof(void *);
+}
+
+static unsigned int
+gost_decrypt_block (void *c, byte *outbuf, const byte *inbuf)
+{
+  GOST28147_context *ctx = c;
+  u32 n1, n2;
+
+  n1 = buf_get_le32 (inbuf);
+  n2 = buf_get_le32 (inbuf+4);
+
+  n2 ^= gost_val (ctx, n1, 0); n1 ^= gost_val (ctx, n2, 1);
+  n2 ^= gost_val (ctx, n1, 2); n1 ^= gost_val (ctx, n2, 3);
+  n2 ^= gost_val (ctx, n1, 4); n1 ^= gost_val (ctx, n2, 5);
+  n2 ^= gost_val (ctx, n1, 6); n1 ^= gost_val (ctx, n2, 7);
+
+  n2 ^= gost_val (ctx, n1, 7); n1 ^= gost_val (ctx, n2, 6);
+  n2 ^= gost_val (ctx, n1, 5); n1 ^= gost_val (ctx, n2, 4);
+  n2 ^= gost_val (ctx, n1, 3); n1 ^= gost_val (ctx, n2, 2);
+  n2 ^= gost_val (ctx, n1, 1); n1 ^= gost_val (ctx, n2, 0);
+
+  n2 ^= gost_val (ctx, n1, 7); n1 ^= gost_val (ctx, n2, 6);
+  n2 ^= gost_val (ctx, n1, 5); n1 ^= gost_val (ctx, n2, 4);
+  n2 ^= gost_val (ctx, n1, 3); n1 ^= gost_val (ctx, n2, 2);
+  n2 ^= gost_val (ctx, n1, 1); n1 ^= gost_val (ctx, n2, 0);
+
+  n2 ^= gost_val (ctx, n1, 7); n1 ^= gost_val (ctx, n2, 6);
+  n2 ^= gost_val (ctx, n1, 5); n1 ^= gost_val (ctx, n2, 4);
+  n2 ^= gost_val (ctx, n1, 3); n1 ^= gost_val (ctx, n2, 2);
+  n2 ^= gost_val (ctx, n1, 1); n1 ^= gost_val (ctx, n2, 0);
+
+  buf_put_le32 (outbuf+0, n2);
+  buf_put_le32 (outbuf+4, n1);
+
+  return /* burn_stack */ 4*sizeof(void*) /* func call */ +
+                          3*sizeof(void*) /* stack */ +
+                          4*sizeof(void*) /* gost_val call */;
+}
+
+static gpg_err_code_t
+gost_set_sbox (GOST28147_context *ctx, const char *oid)
+{
+  int i;
+
+  for (i = 0; gost_oid_map[i].oid; i++)
+    {
+      if (!strcmp(gost_oid_map[i].oid, oid))
+        {
+          ctx->sbox = gost_oid_map[i].sbox;
+          return 0;
+        }
+    }
+  return GPG_ERR_VALUE_NOT_FOUND;
+}
+
+static gpg_err_code_t
+gost_set_extra_info (void *c, int what, const void *buffer, size_t buflen)
+{
+  GOST28147_context *ctx = c;
+  gpg_err_code_t ec = 0;
+
+  (void)buffer;
+  (void)buflen;
+
+  switch (what)
+    {
+    case GCRYCTL_SET_SBOX:
+      ec = gost_set_sbox (ctx, buffer);
+      break;
+
+    default:
+      ec = GPG_ERR_INV_OP;
+      break;
+    }
+  return ec;
+}
+
+static gcry_cipher_oid_spec_t oids_gost28147[] =
+  {
+    /* { "1.2.643.2.2.31.0", GCRY_CIPHER_MODE_CNTGOST }, */
+    { "1.2.643.2.2.31.1", GCRY_CIPHER_MODE_CFB },
+    { "1.2.643.2.2.31.2", GCRY_CIPHER_MODE_CFB },
+    { "1.2.643.2.2.31.3", GCRY_CIPHER_MODE_CFB },
+    { "1.2.643.2.2.31.4", GCRY_CIPHER_MODE_CFB },
+    { NULL }
+  };
+
+gcry_cipher_spec_t _gcry_cipher_spec_gost28147 =
+  {
+    GCRY_CIPHER_GOST28147, {0, 0},
+    "GOST28147", NULL, oids_gost28147, 8, 256,
+    sizeof (GOST28147_context),
+    gost_setkey,
+    gost_encrypt_block,
+    gost_decrypt_block,
+    NULL, NULL, NULL, gost_set_extra_info,
+  };
generated by cgit-pink 1.4.1 (git 2.36.1) at 2024-11-13 14:25:36 +0000