From ca0e51d89c5b3979f38918b3df7e0f9137f251ce Mon Sep 17 00:00:00 2001
From: madmaxoft <github@xoft.cz>
Date: Sat, 25 Jan 2014 19:19:17 +0100
Subject: Added RSA encryption to crypto wrappers.

---
 src/Crypto.cpp | 34 ++++++++++++++++++++++++++++++++++
 src/Crypto.h   |  5 +++++
 2 files changed, 39 insertions(+)

(limited to 'src')

diff --git a/src/Crypto.cpp b/src/Crypto.cpp
index 5ad866f34..2045d0385 100644
--- a/src/Crypto.cpp
+++ b/src/Crypto.cpp
@@ -196,6 +196,40 @@ int cRSAPrivateKey::Decrypt(const Byte * a_EncryptedData, size_t a_EncryptedLeng
 
 
 
+int cRSAPrivateKey::Encrypt(const Byte * a_PlainData, size_t a_PlainLength, Byte * a_EncryptedData, size_t a_EncryptedMaxLength)
+{
+	if (a_EncryptedMaxLength < m_Rsa.len)
+	{
+		LOGD("%s: Invalid a_EncryptedMaxLength: got %u, exp at least %u",
+			__FUNCTION__, (unsigned)a_EncryptedMaxLength, (unsigned)(m_Rsa.len)
+		);
+		ASSERT(!"Invalid a_DecryptedMaxLength!");
+		return -1;
+	}
+	if (a_PlainLength < m_Rsa.len)
+	{
+		LOGD("%s: Invalid a_PlainLength: got %u, exp at least %u",
+			__FUNCTION__, (unsigned)a_PlainLength, (unsigned)(m_Rsa.len)
+		);
+		ASSERT(!"Invalid a_PlainLength!");
+		return -1;
+	}
+	size_t DecryptedLength;
+	int res = rsa_pkcs1_encrypt(
+		&m_Rsa, ctr_drbg_random, &m_Ctr_drbg, RSA_PUBLIC,
+		a_PlainLength, a_PlainData, a_EncryptedData
+	);
+	if (res != 0)
+	{
+		return -1;
+	}
+	return (int)DecryptedLength;
+}
+
+
+
+
+
 ///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 // cAESCFBDecryptor:
 
diff --git a/src/Crypto.h b/src/Crypto.h
index 6b576f55b..a97f34fbf 100644
--- a/src/Crypto.h
+++ b/src/Crypto.h
@@ -43,6 +43,11 @@ public:
 	Returns the number of bytes decrypted, or negative number for error. */
 	int Decrypt(const Byte * a_EncryptedData, size_t a_EncryptedLength, Byte * a_DecryptedData, size_t a_DecryptedMaxLength);
 	
+	/** Encrypts the data using RSAES-PKCS#1 algorithm.
+	Both a_EncryptedData and a_DecryptedData must be at least <KeySizeBytes> bytes large.
+	Returns the number of bytes decrypted, or negative number for error. */
+	int Encrypt(const Byte * a_PlainData, size_t a_PlainLength, Byte * a_EncryptedData, size_t a_EncryptedMaxLength);
+	
 protected:
 	rsa_context m_Rsa;
 	entropy_context m_Entropy;
-- 
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