leancrypt

leancrypt is a lean, header-only C++ crypto library.

Currently only some hashes are supported.

The goal is to have a single readable and portable self-contained header file per crypto primitive, without any external dependencies. The code is pure C++ without using any nonportable builtin functions or inline assembler.

Supported functionality

Hashes:

• SHA-3/224/256/384/512 hashes
  • SHA-3/128 nonstandard hash (faster than using SHA-3/224 when only needing a 128-bit hash)
• SHA-512 hash
• SHA-256 hash
• SHA-1 hash
• MD5 hash

Performance

Focus is on readability and portability and not on performance. While the performance is not horrible, leancrypt should not be used for data-heavy tasks.

Performance on a MacBook M1 Pro:

HashSha3_128: 691.2 MB/s (268435456 bytes in 0.370s)
HashSha3_224: 599.2 MB/s (268435456 bytes in 0.427s)
HashSha3_256: 561.8 MB/s (268435456 bytes in 0.456s)
HashSha3_384: 435.1 MB/s (268435456 bytes in 0.588s)
HashSha3_512: 303.5 MB/s (268435456 bytes in 0.844s)
HashSha512  : 468.8 MB/s (268435456 bytes in 0.546s)
HashSha256  : 294.2 MB/s (268435456 bytes in 0.870s)
HashSha1    : 459.3 MB/s (268435456 bytes in 0.557s)
HashMd5     : 655.4 MB/s (268435456 bytes in 0.391s)