From 0ca4c41a9780814de19b997f1635668781dd5fdb Mon Sep 17 00:00:00 2001
From: Jeffrey Walton <noloader@gmail.com>
Date: Sun, 10 Feb 2019 23:08:14 -0500
Subject: Add ed25519 SignStream and VerifyStream functions (GH #796, PR #797)

---
 xed25519.cpp | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

(limited to 'xed25519.cpp')

diff --git a/xed25519.cpp b/xed25519.cpp
index 6207e7e1..0ab77876 100644
--- a/xed25519.cpp
+++ b/xed25519.cpp
@@ -685,6 +685,17 @@ size_t ed25519Signer::SignAndRestart(RandomNumberGenerator &rng, PK_MessageAccum
     return ret == 0 ? SIGNATURE_LENGTH : 0;
 }
 
+size_t ed25519Signer::SignStream (RandomNumberGenerator &rng, std::istream& stream, byte *signature) const
+{
+    CRYPTOPP_ASSERT(signature != NULLPTR); CRYPTOPP_UNUSED(rng);
+
+    const ed25519PrivateKey& pk = static_cast<const ed25519PrivateKey&>(GetPrivateKey());
+    int ret = Donna::ed25519_sign(stream, pk.GetPrivateKeyBytePtr(), pk.GetPublicKeyBytePtr(), signature);
+    CRYPTOPP_ASSERT(ret == 0);
+
+    return ret == 0 ? SIGNATURE_LENGTH : 0;
+}
+
 // ******************** ed25519 Verifier ************************* //
 
 bool ed25519PublicKey::GetVoidValue(const char *name, const std::type_info &valueType, void *pValue) const
@@ -856,4 +867,14 @@ bool ed25519Verifier::VerifyAndRestart(PK_MessageAccumulator &messageAccumulator
     return ret == 0;
 }
 
+bool ed25519Verifier::VerifyStream(std::istream& stream, const byte *signature, size_t signatureLen) const
+{
+    CRYPTOPP_ASSERT(signatureLen == SIGNATURE_LENGTH);
+
+    const ed25519PublicKey& pk = static_cast<const ed25519PublicKey&>(GetPublicKey());
+    int ret = Donna::ed25519_sign_open(stream, pk.GetPublicKeyBytePtr(), signature);
+
+    return ret == 0;
+}
+
 NAMESPACE_END  // CryptoPP
-- 
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