From 6487ea8b85847c2c2ea68d4f01790440a3eaac72 Mon Sep 17 00:00:00 2001
From: ENGO150 <v.smejkal06@gmail.com>
Date: Sat, 13 Apr 2024 13:30:52 +0200
Subject: [PATCH] defined why2_chat_rsa_pub_encrypt

pog
---
 src/chat/crypto.c | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/src/chat/crypto.c b/src/chat/crypto.c
index c7511c5..8267c50 100644
--- a/src/chat/crypto.c
+++ b/src/chat/crypto.c
@@ -168,4 +168,28 @@ char *why2_get_chat_modulus(void)
 char *why2_get_chat_d(void)
 {
     return rsa_d;
+}
+
+char *why2_chat_rsa_pub_encrypt(long to_encrypt)
+{
+    //VARIABLES
+    char *output;
+    mpz_t m, c, n, e;
+    mpz_init(c);
+
+    //GET ALL STUFF
+    mpz_init_set_si(m, to_encrypt);
+    mpz_init_set_str(n, why2_get_chat_modulus(), WHY2_CHAT_KEY_BASE);
+    mpz_init_set_si(e, WHY2_CHAT_RSA_EXPONENT);
+
+    //ENCRYPT MESSAGE
+    mpz_powm(c, m, e, n);
+
+    output = why2_malloc(mpz_sizeinbase(c, WHY2_CHAT_KEY_BASE) + 2); //ALLOCATE OUTPUT
+    mpz_get_str(output, WHY2_CHAT_KEY_BASE, c); //GET OUTPUT
+
+    //DEALLOCATION
+    mpz_clears(m, c, n, e, NULL);
+
+    return output;
 }
\ No newline at end of file