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create encrypted LS2

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orignal 2019-04-08 13:27:21 -04:00
parent ef0fb48f1f
commit 3ac74e1091
1 changed files with 29 additions and 2 deletions
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31
libi2pd/LeaseSet.cpp
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@ -856,7 +856,9 @@ namespace data
LocalLeaseSet2::LocalLeaseSet2 (std::shared_ptr<const LeaseSet2> ls, const i2p::data::PrivateKeys& keys, i2p::data::SigningKeyType blindedKeyType):
LocalLeaseSet (ls->GetIdentity (), nullptr, 0)
{
m_BufferLen = ls->GetBufferLen (); // TODO
size_t lenInnerPlaintext = ls->GetBufferLen () + 1, lenOuterPlaintext = lenInnerPlaintext + 32 + 1,
lenOuterCiphertext = lenOuterPlaintext + 32;
m_BufferLen = 2/*blinded sig type*/ + 32/*blinded pub key*/ + 4/*published*/ + 2/*expires*/ + 2/*flags*/ + lenOuterCiphertext + 64/*signature*/;
m_Buffer = new uint8_t[m_BufferLen + 1];
m_Buffer[0] = NETDB_STORE_TYPE_ENCRYPTED_LEASESET2;
BlindedPublicKey blindedKey (ls->GetIdentity ());
@ -876,7 +878,32 @@ namespace data
htobe16buf (m_Buffer + offset, expires > 0 ? expires : 0); // expires
uint16_t flags = 0;
htobe16buf (m_Buffer + offset, flags); offset += 2; // flags
// TODO:
htobe16buf (m_Buffer + offset, lenOuterCiphertext); offset += 2; // lenOuterCiphertext
// outerChipherText
// Layer 1
uint8_t subcredential[36];
blindedKey.GetSubcredential (blindedPub, 32, subcredential);
htobe32buf (subcredential + 32, timestamp); // outerInput = subcredential || publishedTimestamp
// keys = HKDF(outerSalt, outerInput, "ELS2_L1K", 44)
uint8_t keys1[64]; // 44 bytes actual data
RAND_bytes (m_Buffer + offset, 32); // outerSalt = CSRNG(32)
i2p::crypto::HKDF (m_Buffer + offset, subcredential, 36, "ELS2_L1K", keys1);
offset += 32; // outerSalt
uint8_t * outerPlainText = m_Buffer + offset;
m_Buffer[offset] = 0; offset++; // flag
// Layer 2
// keys = HKDF(outerSalt, outerInput, "ELS2_L2K", 44)
uint8_t keys2[64]; // 44 bytes actual data
RAND_bytes (m_Buffer + offset, 32); // innerSalt = CSRNG(32)
i2p::crypto::HKDF (m_Buffer + offset, subcredential, 36, "ELS2_L2K", keys2);
offset += 32; // innerSalt
m_Buffer[offset] = ls->GetStoreType ();
memcpy (m_Buffer + offset, ls->GetBuffer (), ls->GetBufferLen ());
i2p::crypto::ChaCha20 (m_Buffer + offset, lenInnerPlaintext, keys2, keys2 + 32, m_Buffer + offset); // encrypt Layer 2
offset += lenInnerPlaintext;
i2p::crypto::ChaCha20 (outerPlainText, lenOuterPlaintext, keys1, keys1 + 32, outerPlainText); // encrypt Layer 1
// signature
blindedSigner->Sign (m_Buffer, offset, m_Buffer + offset);
}
}
}