Pocketcrypt serial

Star 2. Lightweight cryptography MIT License. Code Pull requests Actions Security Insights. Branches Tags. Could not load branches. Could not load tags. Latest commit. Git stats 44 commits. Failed to load latest commit information. View code. Eschewing interoperability with the standard museum of primitives and protocols, it offers concise, easily-understood code that avoids the ugly boilerplate and obfuscation of larger libraries.

This early version of Pocketcrypt is neither formally audited nor officially released. Safely composing these low-level primitives requires cryptographic expertise.

Gimli and Xoodoo are also relatively new and still under active cryptanalytic scrutiny. Please review the relevant literature and audit the implementation carefully before considering this library. To use this header-only library, copy duplex.

There are no link-time dependencies. Internally, higher-level duplex operations absorb and squeeze bytes in byte chunks corresponding to the permutation rate. By maintaining a byte counter alongside the duplex state, operations can also seamlessly absorb, squeeze, encrypt and decrypt partial chunks. Once any final partial chunk is absorbed, the counter will advance by length ready for the next duplex operation. Before permuting and continuing to the next chunk, the plaintext is absorbed back into the rate.

For encryption this is the original chunk; for decryption it is the updated chunk. The counter will advance by length. To implement authenticated encryption, squeeze and append a rate-sized tag after encrypting a message and padding the state.

The counter will advance to the next multiple of the rate. However, to avoid extension attacks, variable-length messages must be padded even if they happen to be an exact multiple of the rate.

If a or b is null, the other argument is compared with zero. This is useful for validating authentication tags or checking other secret data without inadvertently revealing the location of the first discrepancy through the time taken to detect it. This macro may evaluate the index argument more than once. The resulting representation is independent of host byte order: the twelve bit state words are accessed in turn, followed by the bit counter, each in standard little-endian order.

They are unused by duplex. Implementation notes This is a straightforward vector conversion, trivial to check against the reference Gimli and Xoodoo implementations. Modern gcc and clang compile vector extensions impressively well.

Although duplex. At the time of writing, duplex. Prototypes for available operations are in x Code using them must be linked against x To use the library, copy both files into your tree. Both curve points represented by Montgomery x-coordinates and scalars are manipulated as byte little-endian arrays.

The correct-sized array type and standard base point generator are defined by x This is valid for modern x and arm64 processors, but variable-time multiplies on some embedded platforms may introduce timing leaks. The library currently runs faster compiled with clang -O3 than with gcc -O3. However, raising the analogous -finline-limit value on gcc appears to hinder performance. This is used to detect non-contributory behaviour as described below.

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