Function decrypt_key 

pub(crate) fn decrypt_key(encrypted_data: &[u8], pwd: &[u8]) -> Result<Vec<u8>>

Decrypts data that was encrypted with encrypt_key

Arguments

• encrypted_data - The encrypted data containing salt, nonce, and ciphertext
• pwd - The password bytes to derive the decryption key from

Returns

• Result<Vec<u8>> - The decrypted private key bytes

Security

• Verifies authentication tag to ensure data integrity
• Uses the same PBKDF2 parameters as encryption