--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/rsa_encrypt_key.c	Tue Jun 15 14:07:21 2004 +0000
@@ -0,0 +1,59 @@
+/* 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 "mycrypt.h"
+
+#ifdef MRSA
+
+/* OAEP pad then encrypt */
+int rsa_encrypt_key(const unsigned char *inkey,  unsigned long inlen,
+                          unsigned char *outkey, unsigned long *outlen,
+                    const unsigned char *lparam, unsigned long lparamlen,
+                    prng_state *prng, int prng_idx, int hash_idx, rsa_key *key)
+{
+  unsigned long modulus_bitlen, modulus_bytelen, x;
+  int           err;
+  
+  _ARGCHK(inkey  != NULL);
+  _ARGCHK(outkey != NULL);
+  _ARGCHK(outlen != NULL);
+  _ARGCHK(key    != NULL);
+  
+  /* valid prng and hash ? */
+  if ((err = prng_is_valid(prng_idx)) != CRYPT_OK) {
+     return err;
+  }
+  if ((err = hash_is_valid(hash_idx)) != CRYPT_OK) {
+     return err;
+  }
+  
+  /* get modulus len in bits */
+  modulus_bitlen = mp_count_bits(&(key->N));
+
+  /* outlen must be at least the size of the modulus */
+  modulus_bytelen = mp_unsigned_bin_size(&(key->N));
+  if (modulus_bytelen > *outlen) {
+     return CRYPT_BUFFER_OVERFLOW;
+  }
+      
+  /* OAEP pad the key */
+  x = *outlen;
+  if ((err = pkcs_1_oaep_encode(inkey, inlen, lparam, 
+                                lparamlen, modulus_bitlen, prng, prng_idx, hash_idx, 
+                                outkey, &x)) != CRYPT_OK) {
+     return err;
+  }                                
+
+  /* rsa exptmod the OAEP pad */
+  return rsa_exptmod(outkey, x, outkey, outlen, PK_PUBLIC, prng, prng_idx, key);
+}
+
+#endif /* MRSA */