cppcrypto
C++ cryptographic library (modern hash functions, ciphers, KDFs)
...Includes sample command-line tools:
- 'digest' - for calculating and verifying file checksum(s) using any of the supported hash algorithms (similar to md5sum or RHash).
- 'cryptor' - for file encryption using Serpent-256 algorithm in AEAD mode.
Check out the cppcrypto web site linked below for programming documentation.