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AES-128-WRAP-INV ENCRYPTION TOOL

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The AES-128-WRAP-INV algorithm is a cryptographic procedure used for the unwrapping of data keys that were previously protected using the AES Key Wrap standard. It specifically employs the Advanced Encryption Standard (AES) with a 128-bit key length to ensure secure and efficient key recovery. This algorithm is designed to reverse the wrapping process, restoring the original plaintext key from its encrypted form.

Algorithm Overview

The algorithm operates on a sequence of input data blocks that represent the wrapped key. Each block is precisely 64 bits in length, conforming to the AES Key Wrap specification. The total number of blocks, denoted as n, determines the iteration count during the unwrapping process. The algorithm utilizes a fixed initialization vector (IV) that is combined with intermediate values to maintain data integrity throughout the operation.

Step-by-Step Procedure

  1. Initialize the intermediate variable A with the predetermined IV.
  2. Divide the input ciphertext into n blocks labeled R[1] through R[n].
  3. For each round, from j = 5 down to 0, iterate over the blocks in reverse order:
    • Compute a temporary value by XOR-ing A with a round-dependent constant derived from the block index and round number.
    • Decrypt the concatenation of the temporary value and the current block using AES-128 in ECB mode.
    • Update A with the first 64 bits of the decrypted output.
    • Replace the current block with the last 64 bits of the decrypted output.
  4. After completing all iterations, compare A with the initial IV to validate successful unwrapping.
  5. If the comparison is successful, the sequence R[1] through R[n] represents the original unwrapped key.

Security Considerations

The AES-128-WRAP-INV algorithm maintains the security properties of AES-128, ensuring that the unwrapped key cannot be recovered without access to the correct wrapping key. The integrity check using the IV prevents undetected tampering, and the iterative decryption ensures that the relationship between blocks is preserved accurately. Any deviation in the ciphertext or key results in verification failure, providing resistance against unauthorized manipulation.

Implementation Notes

Implementations must carefully manage byte ordering and block alignment to comply with the AES Key Wrap standard. Side-channel protections are recommended, as the repeated decryption operations can be susceptible to timing attacks if not handled correctly. Optimized libraries often provide built-in functions for AES-128 key unwrapping that conform to the NIST specification, reducing the risk of implementation errors.

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