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ChaCha20 decrypt

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orignal 2019-02-28 13:31:51 -05:00
parent af65af5be9
commit 9188e3ad3f
3 changed files with 26 additions and 3 deletions
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10
libi2pd/LeaseSet.cpp
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@ -473,11 +473,15 @@ namespace data
H ("subcredential", { {credential, 32}, {blindedPublicKey, blindedKeyLen} }, subcredential);
// outerInput = subcredential || publishedTimestamp
memcpy (subcredential + 32, publishedTimestamp, 4);
// outerSalt = outerCiphertext[32:end]
// outerSalt = outerCiphertext[0:32]
// keys = HKDF(outerSalt, outerInput, "ELS2_L1K", 44)
uint8_t outerKey[44];
HKDF (outerCiphertext + lenOuterCiphertext - 32, {subcredential, 36}, "ELS2_L1K", outerKey, 44);
// decrypt using chacha20
HKDF (outerCiphertext, {subcredential, 36}, "ELS2_L1K", outerKey, 44);
// decrypt Layer 1
// outerKey = keys[0:31]
// outerIV = keys[32:43]
std::vector<uint8_t> outerPlainText (lenOuterCiphertext - 32);
i2p::crypto::ChaCha20 (outerCiphertext + 32, lenOuterCiphertext - 32, outerKey, outerKey + 32, outerPlainText.data ());
}
}