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OpenSSL

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Features

openssl/openssl

Features

User-visible capabilities of the OpenSSL toolkit, each spanning multiple subsystems.

Page Source roots One-liner
tls ssl/, ssl/statem/, ssl/record/, ssl/ech/ TLS 1.0–1.3, DTLS 1.0–1.2, ECH.
quic ssl/quic/, ssl/rio/ QUIC v1 client and server.
x509-pki crypto/x509/, crypto/ocsp/, crypto/ct/, crypto/ts/ Certificates, CRLs, OCSP, CT, RFC 3161 timestamps.
cms crypto/cms/, crypto/pkcs7/, crypto/pkcs12/ Cryptographic Message Syntax and the PKCS family.
cmp crypto/cmp/, crypto/crmf/, apps/cmp.c RFC 4210 Certificate Management Protocol.
encoders-decoders crypto/encode_decode/, providers/implementations/encode_decode/ DER↔PEM↔OSSL_PARAM key codecs (3.0+).
post-quantum crypto/{ml_kem,ml_dsa,slh_dsa,lms}/ ML-KEM, ML-DSA, SLH-DSA, LMS.

Every feature in this section relies on the subsystems described under subsystems (EVP, ASN.1, BIO, RAND, threading, error handling) and at least one provider.

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