From 9de52252acb22104584ff7a0746ee81734c3f19e Mon Sep 17 00:00:00 2001
From: madmaxoft <github@xoft.cz>
Date: Tue, 28 Jan 2014 23:38:56 +0100
Subject: Crypto: Added public key encryption / decryption.

---
 src/Crypto.cpp | 75 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 75 insertions(+)

(limited to 'src/Crypto.cpp')

diff --git a/src/Crypto.cpp b/src/Crypto.cpp
index 6f7047ab0..7a06d7fa3 100644
--- a/src/Crypto.cpp
+++ b/src/Crypto.cpp
@@ -229,6 +229,81 @@ int cRSAPrivateKey::Encrypt(const Byte * a_PlainData, size_t a_PlainLength, Byte
 
 
 
+///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// cPublicKey:
+
+cPublicKey::cPublicKey(const AString & a_PublicKeyDER)
+{
+	pk_init(&m_Pk);
+	if (pk_parse_public_key(&m_Pk, (const Byte *)a_PublicKeyDER.data(), a_PublicKeyDER.size()) != 0)
+	{
+		ASSERT(!"Cannot parse PubKey");
+		return;
+	}
+	InitRnd();
+}
+
+
+
+
+
+cPublicKey::~cPublicKey()
+{
+	pk_free(&m_Pk);
+}
+
+
+
+
+
+int cPublicKey::Decrypt(const Byte * a_EncryptedData, size_t a_EncryptedLength, Byte * a_DecryptedData, size_t a_DecryptedMaxLength)
+{
+	size_t DecryptedLen = a_DecryptedMaxLength;
+	int res = pk_decrypt(&m_Pk,
+		a_EncryptedData, a_EncryptedLength,
+		a_DecryptedData, &DecryptedLen, a_DecryptedMaxLength,
+		ctr_drbg_random, &m_Ctr_drbg
+	);
+	if (res != 0)
+	{
+		return res;
+	}
+	return (int)DecryptedLen;
+}
+
+
+
+
+
+int cPublicKey::Encrypt(const Byte * a_PlainData, size_t a_PlainLength, Byte * a_EncryptedData, size_t a_EncryptedMaxLength)
+{
+	size_t EncryptedLength = a_EncryptedMaxLength;
+	int res = pk_encrypt(&m_Pk,
+		a_PlainData, a_PlainLength, a_EncryptedData, &EncryptedLength, a_EncryptedMaxLength,
+		ctr_drbg_random, &m_Ctr_drbg
+	);
+	if (res != 0)
+	{
+		return res;
+	}
+	return (int)EncryptedLength;
+}
+
+
+
+
+
+void cPublicKey::InitRnd(void)
+{
+	entropy_init(&m_Entropy);
+	const unsigned char pers[] = "rsa_genkey";
+	ctr_drbg_init(&m_Ctr_drbg, entropy_func, &m_Entropy, pers, sizeof(pers) - 1);
+}
+
+
+
+
+
 ///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 // cAESCFBDecryptor:
 
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