OpenSSL has an encoding & decoding sublibrary wrapping it's buffered I/O sublib, as well as a choice of backend formats. Adding a fair bit of abstraction improving resilience.
There's another sublib "engine" managing (various) methodtables, which powers the (de)serializers the last one abstracts. Abstractions are lighter here, but certainly not absent.
There's a sublib aggregate all the error-codes defined elsewhere.
OpenSSL has an ESS-format certificate parser building upon ASN.
There's a complex sublib implementing EVP encryption, by wrapping various other cyphers (possibly tweaked) exposing a common interface implementing various cryptographic operations.
FFC is centres on modulo-exponentiation, additoin, & comparison on big numbers.
HMAC wraps EVP digests.
HPKE also wraps EVP, with a lot more complexity.
OpneSSL has a basic (synchronous) HTTP(S) client, & URL parser.
IDEA centres on XOR on XOR, bitpacking, shifts, & addition/subtraction. Multiplies & remainders are used to reverse a key, in a way OpenSSL suggests that they don't understand.
KDF is deprecated, & now a noop.
LHash implements a closed-address hashmap, which can output its stats to a file via buffered I/O.
MD2 centres on XOR against a lookuptable.
MD4 centres on XOR, addition, & rotation. As does MD5, which can be combined with SHA1.
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