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diff --git a/libtomcrypt/src/pk/rsa/rsa_encrypt_key.c b/libtomcrypt/src/pk/rsa/rsa_encrypt_key.c
new file mode 100644
index 0000000..ef066d2
--- /dev/null
+++ b/libtomcrypt/src/pk/rsa/rsa_encrypt_key.c
@@ -0,0 +1,100 @@
+/* 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.
+ */
+#include "tomcrypt.h"
+
+/**
+  @file rsa_encrypt_key.c
+  RSA PKCS #1 encryption, Tom St Denis and Andreas Lange
+*/
+
+#ifdef LTC_MRSA
+
+/**
+    (PKCS #1 v2.0) OAEP pad then encrypt
+    @param in          The plaintext
+    @param inlen       The length of the plaintext (octets)
+    @param out         [out] The ciphertext
+    @param outlen      [in/out] The max size and resulting size of the ciphertext
+    @param lparam      The system "lparam" for the encryption
+    @param lparamlen   The length of lparam (octets)
+    @param prng        An active PRNG
+    @param prng_idx    The index of the desired prng
+    @param hash_idx    The index of the desired hash
+    @param padding     Type of padding (LTC_PKCS_1_OAEP or LTC_PKCS_1_V1_5)
+    @param key         The RSA key to encrypt to
+    @return CRYPT_OK if successful
+*/
+int rsa_encrypt_key_ex(const unsigned char *in,     unsigned long inlen,
+                             unsigned char *out,    unsigned long *outlen,
+                       const unsigned char *lparam, unsigned long lparamlen,
+                       prng_state *prng, int prng_idx, int hash_idx, int padding, rsa_key *key)
+{
+  unsigned long modulus_bitlen, modulus_bytelen, x;
+  int           err;
+
+  LTC_ARGCHK(in     != NULL);
+  LTC_ARGCHK(out    != NULL);
+  LTC_ARGCHK(outlen != NULL);
+  LTC_ARGCHK(key    != NULL);
+
+  /* valid padding? */
+  if ((padding != LTC_PKCS_1_V1_5) &&
+      (padding != LTC_PKCS_1_OAEP)) {
+    return CRYPT_PK_INVALID_PADDING;
+  }
+
+  /* valid prng? */
+  if ((err = prng_is_valid(prng_idx)) != CRYPT_OK) {
+     return err;
+  }
+
+  if (padding == LTC_PKCS_1_OAEP) {
+    /* valid hash? */
+    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) {
+     *outlen = modulus_bytelen;
+     return CRYPT_BUFFER_OVERFLOW;
+  }
+
+  if (padding == LTC_PKCS_1_OAEP) {
+    /* OAEP pad the key */
+    x = *outlen;
+    if ((err = pkcs_1_oaep_encode(in, inlen, lparam,
+                                  lparamlen, modulus_bitlen, prng, prng_idx, hash_idx,
+                                  out, &x)) != CRYPT_OK) {
+       return err;
+    }
+  } else {
+    /* PKCS #1 v1.5 pad the key */
+    x = *outlen;
+    if ((err = pkcs_1_v1_5_encode(in, inlen, LTC_PKCS_1_EME,
+                                  modulus_bitlen, prng, prng_idx,
+                                  out, &x)) != CRYPT_OK) {
+      return err;
+    }
+  }
+
+  /* rsa exptmod the OAEP or PKCS #1 v1.5 pad */
+  return ltc_mp.rsa_me(out, x, out, outlen, PK_PUBLIC, key);
+}
+
+#endif /* LTC_MRSA */
+
+/* ref:         $Format:%D$ */
+/* git commit:  $Format:%H$ */
+/* commit time: $Format:%ai$ */