1 files changed, 76 insertions, 0 deletions
diff --git a/libtomcrypt/src/pk/rsa/rsa_export.c b/libtomcrypt/src/pk/rsa/rsa_export.c
new file mode 100644
index 0000000..f2e324d
--- /dev/null
+++ b/libtomcrypt/src/pk/rsa/rsa_export.c
@@ -0,0 +1,76 @@
+/* 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 rsa_export.c
+  Export RSA PKCS keys, Tom St Denis
+*/  
+
+#ifdef MRSA
+
+/**
+    This will export either an RSAPublicKey or RSAPrivateKey [defined in PKCS #1 v2.1] 
+    @param out       [out] Destination of the packet
+    @param outlen    [in/out] The max size and resulting size of the packet
+    @param type      The type of exported key (PK_PRIVATE or PK_PUBLIC)
+    @param key       The RSA key to export
+    @return CRYPT_OK if successful
+*/    
+int rsa_export(unsigned char *out, unsigned long *outlen, int type, rsa_key *key)
+{
+   int           err;
+   unsigned long zero=0;
+
+   LTC_ARGCHK(out    != NULL);
+   LTC_ARGCHK(outlen != NULL);
+   LTC_ARGCHK(key    != NULL);
+
+   /* type valid? */
+   if (!(key->type == PK_PRIVATE) && (type == PK_PRIVATE)) {
+      return CRYPT_PK_INVALID_TYPE;
+   }
+
+   if (type == PK_PRIVATE) {
+      /* private key */
+      /* output is 
+            Version, n, e, d, p, q, d mod (p-1), d mod (q - 1), 1/q mod p
+       */
+      if ((err = der_encode_sequence_multi(out, outlen, 
+                          LTC_ASN1_SHORT_INTEGER, 1UL, &zero, 
+                          LTC_ASN1_INTEGER, 1UL, &key->N, 
+                          LTC_ASN1_INTEGER, 1UL, &key->e,
+                          LTC_ASN1_INTEGER, 1UL, &key->d, 
+                          LTC_ASN1_INTEGER, 1UL, &key->p, 
+                          LTC_ASN1_INTEGER, 1UL, &key->q, 
+                          LTC_ASN1_INTEGER, 1UL, &key->dP,
+                          LTC_ASN1_INTEGER, 1UL, &key->dQ, 
+                          LTC_ASN1_INTEGER, 1UL, &key->qP, 
+                          LTC_ASN1_EOL,     0UL, NULL)) != CRYPT_OK) {
+         return err;
+      }
+ 
+      /* clear zero and return */
+      return CRYPT_OK;
+   } else {
+      /* public key */
+      return der_encode_sequence_multi(out, outlen, 
+                                 LTC_ASN1_INTEGER, 1UL, &key->N, 
+                                 LTC_ASN1_INTEGER, 1UL, &key->e, 
+                                 LTC_ASN1_EOL,     0UL, NULL);
+   }
+}
+
+#endif /* MRSA */
+
+/* $Source: /cvs/libtom/libtomcrypt/src/pk/rsa/rsa_export.c,v $ */
+/* $Revision: 1.11 $ */
+/* $Date: 2005/06/04 01:42:48 $ */