Add eddsa from ref10 implementation (with some modifications).

core/crypto/EdDSA25519.cpp

@@ -0,0 +1,44 @@
+#include "EdDSA25519.h"
+#include "ed25519/ed25519_ref10.h"
+#include <cstring>
+
+namespace i2p {
+namespace crypto {
+
+
+EDDSA25519Verifier::EDDSA25519Verifier(const uint8_t* signingKey)
+{
+
+    std::memcpy(m_PublicKey, signingKey, EDDSA25519_PUBLIC_KEY_LENGTH);
+}
+
+bool EDDSA25519Verifier::Verify(const uint8_t* buf, size_t len, const uint8_t* signature) const
+{
+    return ed25519_ref10_open(signature, buf, len, m_PublicKey) > 0;
+}
+
+size_t EDDSA25519Verifier::GetPublicKeyLen() const
+{
+    return EDDSA25519_PUBLIC_KEY_LENGTH;
+}
+
+
+size_t EDDSA25519Verifier::GetSignatureLen() const
+{
+    return EDDSA25519_SIGNATURE_LENGTH;
+}
+
+
+EDDSA25519Signer::EDDSA25519Signer(const uint8_t* signingPrivateKey)
+{
+    std::memcpy(m_PrivateKey, signingPrivateKey, EDDSA25519_PRIVATE_KEY_LENGTH);
+    ed25519_ref10_pubkey(m_PublicKey, m_PrivateKey);
+}
+
+void EDDSA25519Signer::Sign(CryptoPP::RandomNumberGenerator& rnd, const uint8_t* buf, int len, uint8_t* signature) const
+{
+    ed25519_ref10_sign(signature, buf, len, m_PrivateKey, m_PublicKey);
+}
+
+}
+}