1 files changed, 100 insertions, 0 deletions
diff --git a/crypto/heimdal/lib/gssapi/decapsulate.c b/crypto/heimdal/lib/gssapi/decapsulate.c
new file mode 100644
index 0000000..e3603c7
--- /dev/null
+++ b/crypto/heimdal/lib/gssapi/decapsulate.c
@@ -0,0 +1,100 @@
+/*
+ * Copyright (c) 1997 Kungliga Tekniska Högskolan
+ * (Royal Institute of Technology, Stockholm, Sweden). 
+ * All rights reserved. 
+ *
+ * Redistribution and use in source and binary forms, with or without 
+ * modification, are permitted provided that the following conditions 
+ * are met: 
+ *
+ * 1. Redistributions of source code must retain the above copyright 
+ *    notice, this list of conditions and the following disclaimer. 
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright 
+ *    notice, this list of conditions and the following disclaimer in the 
+ *    documentation and/or other materials provided with the distribution. 
+ *
+ * 3. Neither the name of the Institute nor the names of its contributors 
+ *    may be used to endorse or promote products derived from this software 
+ *    without specific prior written permission. 
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 
+ * SUCH DAMAGE. 
+ */
+
+#include "gssapi_locl.h"
+
+RCSID("$Id: decapsulate.c,v 1.5 1999/12/02 17:05:03 joda Exp $");
+
+OM_uint32
+gssapi_krb5_verify_header(u_char **str,
+			  size_t total_len,
+			  char *type)
+{
+    size_t len, len_len, mech_len, foo;
+    int e;
+    u_char *p = *str;
+
+    if (*p++ != 0x60)
+	return GSS_S_DEFECTIVE_TOKEN;
+    e = der_get_length (p, total_len - 1, &len, &len_len);
+    if (e || 1 + len_len + len != total_len)
+	abort ();
+    p += len_len;
+    if (*p++ != 0x06)
+	return GSS_S_DEFECTIVE_TOKEN;
+    e = der_get_length (p, total_len - 1 - len_len - 1,
+			&mech_len, &foo);
+    if (e)
+	abort ();
+    p += foo;
+    if (mech_len != GSS_KRB5_MECHANISM->length)
+	return GSS_S_BAD_MECH;
+    if (memcmp(p,
+	       GSS_KRB5_MECHANISM->elements,
+	       GSS_KRB5_MECHANISM->length) != 0)
+	return GSS_S_BAD_MECH;
+    p += mech_len;
+    if (memcmp (p, type, 2) != 0)
+	return GSS_S_DEFECTIVE_TOKEN;
+    p += 2;
+    *str = p;
+    return GSS_S_COMPLETE;
+}
+
+/*
+ * Remove the GSS-API wrapping from `in_token' giving `out_data.
+ * Does not copy data, so just free `in_token'.
+ */
+
+OM_uint32
+gssapi_krb5_decapsulate(
+			gss_buffer_t input_token_buffer,
+			krb5_data *out_data,
+			char *type
+)
+{
+    u_char *p;
+    OM_uint32 ret;
+
+    p = input_token_buffer->value;
+    ret = gssapi_krb5_verify_header(&p,
+				    input_token_buffer->length,
+				    type);
+    if (ret)
+	return ret;
+
+    out_data->length = input_token_buffer->length -
+	(p - (u_char *)input_token_buffer->value);
+    out_data->data   = p;
+    return GSS_S_COMPLETE;
+}