From f6b8e0eae4374f339487a33e3e4fe5462d5816e1 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?J=C3=B6rg=20Frings-F=C3=BCrst?= <debian@jff-webhosting.net>
Date: Sat, 25 Nov 2017 10:16:00 +0100
Subject: New upstream version 2.0.0

---
 ccast/axTLS/rsa.c | 44 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 44 insertions(+)
 mode change 100644 => 100755 ccast/axTLS/rsa.c

(limited to 'ccast/axTLS/rsa.c')

diff --git a/ccast/axTLS/rsa.c b/ccast/axTLS/rsa.c
old mode 100644
new mode 100755
index e707f2b..14948eb
--- a/ccast/axTLS/rsa.c
+++ b/ccast/axTLS/rsa.c
@@ -187,6 +187,50 @@ int RSA_decrypt(const RSA_CTX *ctx, const uint8_t *in_data,
     return size ? size : -1;
 }
 
+/**
+ * @brief Use PKCS1.5 for decryption.
+ * @param ctx [in] The context
+ * @param in_data [in] The data to encrypt
+ * @param out_data [out] The decrypted data.
+ * @return  The number of bytes that were originally encrypted. -1 on error.
+ */
+int RSA_decrypt2(const RSA_CTX *ctx, const uint8_t *in_data, uint8_t *out_data)
+{
+    const int byte_size = ctx->num_octets;
+    int i, size;
+    bigint *decrypted_bi, *dat_bi;
+    uint8_t *block = (uint8_t *)malloc(byte_size);
+
+    /* decrypt */
+    dat_bi = bi_import(ctx->bi_ctx, in_data, byte_size);
+
+    decrypted_bi = RSA_public(ctx, dat_bi);		/* Frees dat_bi and exponent ? */
+
+    /* convert to a normal block (frees decrypted_bi) */
+    bi_export(ctx->bi_ctx, decrypted_bi, block, byte_size);
+
+
+	/* We assume this is padded with "0001ff....ff00" */
+    i = 2;
+    while (block[i++] == 0xff && i < byte_size)
+		;
+
+	/* Skip last 0x00 */
+	if (i < byte_size && block[i] == 0x00)
+		i++;
+
+    size = byte_size - i;
+
+    /* get only the bit we want */
+    if (size > 0) {
+        memcpy(out_data, &block[i], size);
+	}
+
+    free(block); 
+
+    return size ? size : -1;
+}
+
 /**
  * Performs m = c^d mod n
  */
-- 
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