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cpabe: Serializing ciphertext with 32-bit prefixes. #490

Merged
merged 4 commits into from Apr 24, 2024
Merged

cpabe: Serializing ciphertext with 32-bit prefixes. #490

merged 4 commits into from Apr 24, 2024

Commits on Apr 15, 2024

  1. Using SHAKE128 as a fixed prgn for golden files.

    @armfazh
    armfazh committed Apr 15, 2024
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  2. Testing long plaintext.

    @armfazh
    armfazh committed Apr 15, 2024
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  3. Test functions working with ciphertext.

    @armfazh
    armfazh committed Apr 15, 2024
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  4. Serializing ciphertext with 32-bit prefixes. 

    Notice about ciphertext change and testing format.

Previously, tkn20 ciphertext was encoding the ciphertext header
`C1`, the envelope `env` (containing inner ciphertext), and
macData using 16-bit prefixes, which caused a limitation on
the maximum size allowed for encrypting plaintexts.

With this change, the encoding now uses 32-bit prefixes for
these three elements allowing to encrypt plaintexts longer
than 2^16 bytes. So, ciphertexts produced by tkn20 package are
now 12 bytes longer.

Ciphertexts in the previous format are still decryptable.
The following functions are backwards-compatible:
 - AttributeKey.Decrypt
 - Attributes.CouldDecrypt
 - Policy.ExtractFromCiphertext
    @armfazh
    armfazh committed Apr 15, 2024
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