diff --git a/include/chat/crypto.h b/include/chat/crypto.h
index bd6f9db..0fefa7b 100644
--- a/include/chat/crypto.h
+++ b/include/chat/crypto.h
@@ -42,6 +42,7 @@ char *why2_get_chat_modulus(void); //GET THE RSA MODULUS
 char *why2_get_chat_d(void); //GET THE RSA d
 
 char *why2_chat_rsa_pub_encrypt(long to_encrypt); //RSA ENCRYPT USING PUBLIC KEY
+char *why2_chat_rsa_pri_decrypt(long to_decrypt); //RSA DECRYPT USING PRIVATE KEY
 
 #ifdef __cplusplus
 }
diff --git a/src/chat/crypto.c b/src/chat/crypto.c
index 34e8e5c..947a4e3 100644
--- a/src/chat/crypto.c
+++ b/src/chat/crypto.c
@@ -197,4 +197,9 @@ char *why2_get_chat_d(void)
 char *why2_chat_rsa_pub_encrypt(long to_encrypt)
 {
     return exp_mod(to_encrypt, WHY2_CHAT_RSA_EXPONENT);
+}
+
+char *why2_chat_rsa_pri_decrypt(long to_decrypt)
+{
+    return exp_mod(to_decrypt, why2_get_chat_d());
 }
\ No newline at end of file