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-rw-r--r--src/Crypto.cpp75
-rw-r--r--src/Crypto.h31
2 files changed, 106 insertions, 0 deletions
diff --git a/src/Crypto.cpp b/src/Crypto.cpp
index 6f7047ab0..7a06d7fa3 100644
--- a/src/Crypto.cpp
+++ b/src/Crypto.cpp
@@ -230,6 +230,81 @@ 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:
cAESCFBDecryptor::cAESCFBDecryptor(void) :
diff --git a/src/Crypto.h b/src/Crypto.h
index a97f34fbf..d68f7ec24 100644
--- a/src/Crypto.h
+++ b/src/Crypto.h
@@ -14,6 +14,7 @@
#include "polarssl/entropy.h"
#include "polarssl/ctr_drbg.h"
#include "polarssl/sha1.h"
+#include "polarssl/pk.h"
@@ -62,6 +63,36 @@ protected:
+class cPublicKey
+{
+public:
+ cPublicKey(const AString & a_PublicKeyDER);
+ ~cPublicKey();
+
+ /** Decrypts the data using the stored public key
+ 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 Decrypt(const Byte * a_EncryptedData, size_t a_EncryptedLength, Byte * a_DecryptedData, size_t a_DecryptedMaxLength);
+
+ /** Encrypts the data using the stored public key
+ 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:
+ pk_context m_Pk;
+ entropy_context m_Entropy;
+ ctr_drbg_context m_Ctr_drbg;
+
+ /** Initializes the m_Entropy and m_Ctr_drbg contexts
+ Common part of this object's construction, called from all constructors. */
+ void InitRnd(void);
+} ;
+
+
+
+
+
/** Decrypts data using the AES / CFB (128) algorithm */
class cAESCFBDecryptor
{