Crypt Modules

This section documents xutils/src/crypt/*.

Files

• aes.md: AES-CBC, XBC and SIV implementations plus context initialization rules
• base64.md: standard and URL-safe Base64 encoders/decoders
• crc32.md: CRC32 calculators
• crypt.md: generic cipher-chain wrapper over hashes, codecs and symmetric/asymmetric transforms
• hmac.md: HMAC-SHA256 and HMAC-MD5 helpers
• md5.md: MD5 digest helpers
• rsa.md: RSA key management, encrypt/decrypt and RS256-style signing helpers
• sha1.md: SHA-1 digest helpers
• sha256.md: SHA-256 digest helpers

Common Rules

• Most functions that return a pointer allocate memory with malloc/calloc. The caller owns the result.
• Binary outputs often include an extra trailing NUL, but callers must still use the returned length for transport and file I/O.
• The generic crypt.c layer mixes reversible transforms, hashes and text encodings. Chaining works, but only reversible stages are valid on the decrypt path.