--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/pk/dsa/dsa_export.c	Fri May 06 13:23:02 2005 +0000
@@ -0,0 +1,75 @@
+/* LibTomCrypt, modular cryptographic library -- Tom St Denis
+ *
+ * LibTomCrypt is a library that provides various cryptographic
+ * algorithms in a highly modular and flexible manner.
+ *
+ * The library is free for all purposes without any express
+ * guarantee it works.
+ *
+ * Tom St Denis, [email protected], http://libtomcrypt.org
+ */
+#include "tomcrypt.h"
+
+/**
+   @file dsa_export.c
+   DSA implementation, export key, Tom St Denis
+*/
+
+#ifdef MDSA
+
+/**
+  Export a DSA key to a binary packet
+  @param out    [out] Where to store the packet
+  @param outlen [in/out] The max size and resulting size of the packet
+  @param type   The type of key to export (PK_PRIVATE or PK_PUBLIC)
+  @param key    The key to export
+  @return CRYPT_OK if successful
+*/
+int dsa_export(unsigned char *out, unsigned long *outlen, int type, dsa_key *key)
+{
+   unsigned long y, z;
+   int err;
+
+   LTC_ARGCHK(out    != NULL);
+   LTC_ARGCHK(outlen != NULL);
+   LTC_ARGCHK(key    != NULL);
+
+   /* can we store the static header?  */
+   if (*outlen < (PACKET_SIZE + 1 + 2)) {
+      return CRYPT_BUFFER_OVERFLOW;
+   }
+   
+   if (type == PK_PRIVATE && key->type != PK_PRIVATE) {
+      return CRYPT_PK_TYPE_MISMATCH;
+   }
+
+   if (type != PK_PUBLIC && type != PK_PRIVATE) {
+      return CRYPT_INVALID_ARG;
+   }
+
+   /* store header */
+   packet_store_header(out, PACKET_SECT_DSA, PACKET_SUB_KEY);
+   y = PACKET_SIZE;
+
+   /* store g, p, q, qord */
+   out[y++] = type;
+   out[y++] = (key->qord>>8)&255;
+   out[y++] = key->qord & 255;
+
+   OUTPUT_BIGNUM(&key->g,out,y,z);
+   OUTPUT_BIGNUM(&key->p,out,y,z);
+   OUTPUT_BIGNUM(&key->q,out,y,z);
+
+   /* public exponent */
+   OUTPUT_BIGNUM(&key->y,out,y,z);
+   
+   if (type == PK_PRIVATE) {
+      OUTPUT_BIGNUM(&key->x,out,y,z);
+   }
+
+   *outlen = y;
+   return CRYPT_OK;
+}
+
+#endif
+