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testnet #12

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Sep 17, 2024
Merged

testnet #12

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9 changes: 9 additions & 0 deletions coti/crypto_utils.py
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Original file line number Diff line number Diff line change
Expand Up @@ -206,6 +206,15 @@ def decrypt_rsa(private_key_bytes, ciphertext):
)
return plaintext

#This function recovers a user's key by decrypting two encrypted key shares with the given private key,
#and then XORing the two key shares together.
def recover_user_key(private_key_bytes, encrypted_key_share0, encrypted_key_share1):
key_share0 = decrypt_rsa(private_key_bytes, encrypted_key_share0)
key_share1 = decrypt_rsa(private_key_bytes, encrypted_key_share1)

# XOR both key shares to get the user key
return bytes([a ^ b for a, b in zip(key_share0, key_share1)])


# Function to compute Keccak-256 hash
def keccak256(data):
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