propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)

            to branch 'au.asn.ucc.matt.dropbear' (head fdf4a7a3b97ae5046139915de7e40399cceb2c01)

--HG--
extra : convert_revision : dc4809882e1b9f2dcd3f8bbe38c74a0a52c39ce4

1 files changed, 72 insertions, 0 deletions

diff --git a/libtomcrypt/src/pk/dsa/dsa_export.c b/libtomcrypt/src/pk/dsa/dsa_export.c
new file mode 100644
index 0000000..5a093d9
--- /dev/null
+++ b/libtomcrypt/src/pk/dsa/dsa_export.c
@@ -0,0 +1,72 @@
+/* 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, tomstdenis@gmail.com, 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 char flags[1];
+
+   LTC_ARGCHK(out    != NULL);
+   LTC_ARGCHK(outlen != NULL);
+   LTC_ARGCHK(key    != NULL);
+
+   /* can we store the static header?  */
+   if (type == PK_PRIVATE && key->type != PK_PRIVATE) {
+      return CRYPT_PK_TYPE_MISMATCH;
+   }
+
+   if (type != PK_PUBLIC && type != PK_PRIVATE) {
+      return CRYPT_INVALID_ARG;
+   }
+
+   flags[0] = (type != PK_PUBLIC) ? 1 : 0;
+
+   if (type == PK_PRIVATE) {
+      return der_encode_sequence_multi(out, outlen,
+                                 LTC_ASN1_BIT_STRING,   1UL, flags,
+                                 LTC_ASN1_INTEGER,      1UL, &key->g,
+                                 LTC_ASN1_INTEGER,      1UL, &key->p,
+                                 LTC_ASN1_INTEGER,      1UL, &key->q,
+                                 LTC_ASN1_INTEGER,      1UL, &key->y,
+                                 LTC_ASN1_INTEGER,      1UL, &key->x,
+                                 LTC_ASN1_EOL,          0UL, NULL);
+   } else {
+      return der_encode_sequence_multi(out, outlen,
+                                 LTC_ASN1_BIT_STRING,   1UL, flags,
+                                 LTC_ASN1_INTEGER,      1UL, &key->g,
+                                 LTC_ASN1_INTEGER,      1UL, &key->p,
+                                 LTC_ASN1_INTEGER,      1UL, &key->q,
+                                 LTC_ASN1_INTEGER,      1UL, &key->y,
+                                 LTC_ASN1_EOL,          0UL, NULL);
+   }
+}
+
+#endif
+
+
+/* $Source: /cvs/libtom/libtomcrypt/src/pk/dsa/dsa_export.c,v $ */
+/* $Revision: 1.6 $ */
+/* $Date: 2005/06/03 19:24:31 $ */