AES-256-WRAP-INV ENCRYPTION TOOL

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Input Requirements

The algorithm requires two primary inputs: the wrapped key data and the 256-bit unwrapping key. The wrapped key must have been previously produced using the AES Key Wrap algorithm (AES-256-WRAP). Input data must be aligned in 64-bit blocks as per the key wrapping standard. Any deviation from this structure will result in an error or failure to correctly unwrap the key.

Algorithm Steps

Initialization: Define the integrity check value (ICV) and segment the wrapped key into 64-bit blocks. Initialize a register with the ICV for iterative processing.
Iterative Unwrapping: Perform a reverse transformation for a series of rounds. In each round, apply the AES-256 decryption function to the current block combined with the round counter and the state from the previous step.
State Update: After each decryption, update the intermediate register with the result to propagate changes through all subsequent blocks. Continue this process for six iterations for each block in reverse order, matching the key wrapping standard.
Integrity Verification: Once all blocks are processed, compare the final register value to the expected ICV. If the values match, the algorithm confirms the integrity of the unwrapped key; otherwise, the process fails and returns an error.
Output Generation: Upon successful verification, concatenate the processed blocks to reconstruct the original unwrapped key. The output retains the same bit-length as the initial key material prior to wrapping.

Security Considerations

The AES-256-WRAP-INV algorithm is specifically designed to maintain the confidentiality of the key during unwrapping. The use of a 256-bit key provides strong resistance against brute-force attacks. Integrity checks prevent tampering or corruption of the wrapped key, and any modification of the input data will result in failure to unwrap. Correct implementation must follow strict adherence to block alignment, iterative processing, and verification steps to ensure cryptographic security.

Performance Characteristics

Processing time is linear relative to the number of 64-bit blocks in the wrapped key. Hardware acceleration for AES decryption can significantly improve performance. Memory usage is minimal, primarily requiring temporary storage for the intermediate registers and the unwrapped output. The algorithm is deterministic, producing identical results for the same inputs under all executions.

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