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Speed up AEAD on wrong prekey
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AaronFeickert committed Dec 19, 2023
1 parent 78e7d1e commit a6a1c20
Showing 1 changed file with 4 additions and 4 deletions.
8 changes: 4 additions & 4 deletions src/libspark/aead.cpp
Original file line number Diff line number Diff line change
Expand Up @@ -44,15 +44,15 @@ AEADEncryptedData AEAD::encrypt(const GroupElement& prekey, const std::string ad

// Perform authenticated decryption with ChaCha20-Poly1305 using key commitment
CDataStream AEAD::decrypt_and_verify(const GroupElement& prekey, const std::string additional_data, AEADEncryptedData& data) {
// Derive the key and commitment
std::vector<unsigned char> key = SparkUtils::kdf_aead(prekey);
std::vector<unsigned char> key_commitment = SparkUtils::commit_aead(prekey);

// Assert that the key commitment is valid
std::vector<unsigned char> key_commitment = SparkUtils::commit_aead(prekey);
if (key_commitment != data.key_commitment) {
throw std::runtime_error("Bad AEAD key commitment");
}

// Derive the key
std::vector<unsigned char> key = SparkUtils::kdf_aead(prekey);

// Set up the result
CDataStream result(SER_NETWORK, PROTOCOL_VERSION);

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