Section 7 of the manual provides overviews on various topics, and describes conventions and protocols, character set standards, the standard filesystem layout, and miscellaneous other things.

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AF_RXRPC
rxrpc - Linux RxRPC (AFS) protocol implementation
EVP_ASYM_CIPHER-RSA
RSA Asymmetric Cipher algorithm support
EVP_ASYM_CIPHER-SM2
SM2 Asymmetric Cipher algorithm support
EVP_CIPHER-AES
The AES EVP_CIPHER implementations
EVP_CIPHER-ARIA
The ARIA EVP_CIPHER implementations
EVP_CIPHER-BLOWFISH
The BLOBFISH EVP_CIPHER implementations
EVP_CIPHER-CAMELLIA
The CAMELLIA EVP_CIPHER implementations
EVP_CIPHER-CAST
The CAST EVP_CIPHER implementations
EVP_CIPHER-CHACHA
The CHACHA EVP_CIPHER implementations
EVP_CIPHER-DES
The DES EVP_CIPHER implementations
EVP_CIPHER-IDEA
The IDEA EVP_CIPHER implementations
EVP_CIPHER-NULL
The NULL EVP_CIPHER implementation
EVP_CIPHER-RC2
The RC2 EVP_CIPHER implementations
EVP_CIPHER-RC4
The RC4 EVP_CIPHER implementations
EVP_CIPHER-RC5
The RC5 EVP_CIPHER implementations
EVP_CIPHER-SEED
The SEED EVP_CIPHER implementations
EVP_CIPHER-SM4
The SM4 EVP_CIPHER implementations
EVP_KDF-HKDF
The HKDF EVP_KDF implementation
EVP_KDF-KB
The Key-Based EVP_KDF implementation
EVP_KDF-KRB5KDF
The RFC3961 Krb5 KDF EVP_KDF implementation
EVP_KDF-PBKDF1
The PBKDF1 EVP_KDF implementation
EVP_KDF-PBKDF2
The PBKDF2 EVP_KDF implementation
EVP_KDF-PKCS12KDF
The PKCS#12 EVP_KDF implementation
EVP_KDF-SCRYPT
The scrypt EVP_KDF implementation
EVP_KDF-SS
The Single Step / One Step EVP_KDF implementation
EVP_KDF-SSHKDF
The SSHKDF EVP_KDF implementation
EVP_KDF-TLS13_KDF
The TLS 1.3 EVP_KDF implementation
EVP_KDF-TLS1_PRF
The TLS1 PRF EVP_KDF implementation
EVP_KDF-X942-ASN1
The X9.42-2003 asn1 EVP_KDF implementation
EVP_KDF-X942-CONCAT
The X942 Concat EVP_KDF implementation
EVP_KDF-X963
The X9.63-2001 EVP_KDF implementation
EVP_KEM-RSA
EVP_KEM RSA keytype and algorithm support
EVP_KEYEXCH-DH
DH Key Exchange algorithm support
EVP_KEYEXCH-ECDH
ECDH Key Exchange algorithm support
EVP_KEYEXCH-X25519
EVP_KEYEXCH-X25519, EVP_KEYEXCH-X448 - X25519 and X448 Key Exchange algorithm support
EVP_KEYEXCH-X448
EVP_KEYEXCH-X25519, EVP_KEYEXCH-X448 - X25519 and X448 Key Exchange algorithm support
EVP_KEYMGMT-CMAC
EVP_PKEY-HMAC, EVP_KEYMGMT-HMAC, EVP_PKEY-Siphash, EVP_KEYMGMT-Siphash, EVP_PKEY-Poly1305, EVP_KEYMGMT-Poly1305, EVP_PKEY-CMAC, EVP_KEYMGMT-CMAC - EVP_PKEY legacy MAC keytypes and algorithm support
EVP_KEYMGMT-DH
EVP_PKEY-DH, EVP_PKEY-DHX, EVP_KEYMGMT-DH, EVP_KEYMGMT-DHX - EVP_PKEY DH and DHX keytype and algorithm support
EVP_KEYMGMT-DHX
EVP_PKEY-DH, EVP_PKEY-DHX, EVP_KEYMGMT-DH, EVP_KEYMGMT-DHX - EVP_PKEY DH and DHX keytype and algorithm support
EVP_KEYMGMT-DSA
EVP_PKEY-DSA, EVP_KEYMGMT-DSA - EVP_PKEY DSA keytype and algorithm support
EVP_KEYMGMT-EC
EVP_PKEY-EC, EVP_KEYMGMT-EC - EVP_PKEY EC keytype and algorithm support
EVP_KEYMGMT-ED25519
EVP_PKEY-X25519, EVP_PKEY-X448, EVP_PKEY-ED25519, EVP_PKEY-ED448, EVP_KEYMGMT-X25519, EVP_KEYMGMT-X448, EVP_KEYMGMT-ED25519, EVP_KEYMGMT-ED448 - EVP_PKEY X25519, X448, ED25519 and ED448 keytype and algorithm support
EVP_KEYMGMT-ED448
EVP_PKEY-X25519, EVP_PKEY-X448, EVP_PKEY-ED25519, EVP_PKEY-ED448, EVP_KEYMGMT-X25519, EVP_KEYMGMT-X448, EVP_KEYMGMT-ED25519, EVP_KEYMGMT-ED448 - EVP_PKEY X25519, X448, ED25519 and ED448 keytype and algorithm support
EVP_KEYMGMT-HMAC
EVP_PKEY-HMAC, EVP_KEYMGMT-HMAC, EVP_PKEY-Siphash, EVP_KEYMGMT-Siphash, EVP_PKEY-Poly1305, EVP_KEYMGMT-Poly1305, EVP_PKEY-CMAC, EVP_KEYMGMT-CMAC - EVP_PKEY legacy MAC keytypes and algorithm support
EVP_KEYMGMT-Poly1305
EVP_PKEY-HMAC, EVP_KEYMGMT-HMAC, EVP_PKEY-Siphash, EVP_KEYMGMT-Siphash, EVP_PKEY-Poly1305, EVP_KEYMGMT-Poly1305, EVP_PKEY-CMAC, EVP_KEYMGMT-CMAC - EVP_PKEY legacy MAC keytypes and algorithm support
EVP_KEYMGMT-RSA
EVP_PKEY-RSA, EVP_KEYMGMT-RSA, RSA - EVP_PKEY RSA keytype and algorithm support
EVP_KEYMGMT-SM2
EVP_PKEY-SM2, EVP_KEYMGMT-SM2, SM2 - EVP_PKEY keytype support for the Chinese SM2 signature and encryption algorithms
EVP_KEYMGMT-Siphash
EVP_PKEY-HMAC, EVP_KEYMGMT-HMAC, EVP_PKEY-Siphash, EVP_KEYMGMT-Siphash, EVP_PKEY-Poly1305, EVP_KEYMGMT-Poly1305, EVP_PKEY-CMAC, EVP_KEYMGMT-CMAC - EVP_PKEY legacy MAC keytypes and algorithm support
EVP_KEYMGMT-X25519
EVP_PKEY-X25519, EVP_PKEY-X448, EVP_PKEY-ED25519, EVP_PKEY-ED448, EVP_KEYMGMT-X25519, EVP_KEYMGMT-X448, EVP_KEYMGMT-ED25519, EVP_KEYMGMT-ED448 - EVP_PKEY X25519, X448, ED25519 and ED448 keytype and algorithm support
EVP_KEYMGMT-X448
EVP_PKEY-X25519, EVP_PKEY-X448, EVP_PKEY-ED25519, EVP_PKEY-ED448, EVP_KEYMGMT-X25519, EVP_KEYMGMT-X448, EVP_KEYMGMT-ED25519, EVP_KEYMGMT-ED448 - EVP_PKEY X25519, X448, ED25519 and ED448 keytype and algorithm support
EVP_MAC-BLAKE2
EVP_MAC-BLAKE2, EVP_MAC-BLAKE2BMAC, EVP_MAC-BLAKE2SMAC - The BLAKE2 EVP_MAC implementations
EVP_MAC-BLAKE2BMAC
EVP_MAC-BLAKE2, EVP_MAC-BLAKE2BMAC, EVP_MAC-BLAKE2SMAC - The BLAKE2 EVP_MAC implementations
EVP_MAC-BLAKE2SMAC
EVP_MAC-BLAKE2, EVP_MAC-BLAKE2BMAC, EVP_MAC-BLAKE2SMAC - The BLAKE2 EVP_MAC implementations
EVP_MAC-CMAC
The CMAC EVP_MAC implementation
EVP_MAC-GMAC
The GMAC EVP_MAC implementation
EVP_MAC-HMAC
The HMAC EVP_MAC implementation
EVP_MAC-KMAC
EVP_MAC-KMAC, EVP_MAC-KMAC128, EVP_MAC-KMAC256 - The KMAC EVP_MAC implementations
EVP_MAC-KMAC128
EVP_MAC-KMAC, EVP_MAC-KMAC128, EVP_MAC-KMAC256 - The KMAC EVP_MAC implementations
EVP_MAC-KMAC256
EVP_MAC-KMAC, EVP_MAC-KMAC128, EVP_MAC-KMAC256 - The KMAC EVP_MAC implementations
EVP_MAC-Poly1305
The Poly1305 EVP_MAC implementation
EVP_MAC-Siphash
The Siphash EVP_MAC implementation
EVP_MD-BLAKE2
The BLAKE2 EVP_MD implementation
EVP_MD-KECCAK-KMAC
EVP_MD-SHAKE, EVP_MD-KECCAK-KMAC - The SHAKE / KECCAK family EVP_MD implementations
EVP_MD-MD2
The MD2 EVP_MD implementation
EVP_MD-MD4
The MD4 EVP_MD implementation
EVP_MD-MD5-SHA1
The MD5-SHA1 EVP_MD implementation
EVP_MD-MD5
The MD5 EVP_MD implementation
EVP_MD-MDC2
The MDC2 EVP_MD implementation
EVP_MD-NULL
The NULL EVP_MD implementation
EVP_MD-RIPEMD160
The RIPEMD160 EVP_MD implementation
EVP_MD-SHA1
The SHA1 EVP_MD implementation
EVP_MD-SHA2
The SHA2 EVP_MD implementation
EVP_MD-SHA3
The SHA3 EVP_MD implementations
EVP_MD-SHAKE
EVP_MD-SHAKE, EVP_MD-KECCAK-KMAC - The SHAKE / KECCAK family EVP_MD implementations
EVP_MD-SM3
The SM3 EVP_MD implementations
EVP_MD-WHIRLPOOL
The WHIRLPOOL EVP_MD implementation
EVP_MD-common
The OpenSSL EVP_MD implementations, common things
EVP_PKEY-CMAC
EVP_PKEY-HMAC, EVP_KEYMGMT-HMAC, EVP_PKEY-Siphash, EVP_KEYMGMT-Siphash, EVP_PKEY-Poly1305, EVP_KEYMGMT-Poly1305, EVP_PKEY-CMAC, EVP_KEYMGMT-CMAC - EVP_PKEY legacy MAC keytypes and algorithm support
EVP_PKEY-DH
EVP_PKEY-DH, EVP_PKEY-DHX, EVP_KEYMGMT-DH, EVP_KEYMGMT-DHX - EVP_PKEY DH and DHX keytype and algorithm support
EVP_PKEY-DHX
EVP_PKEY-DH, EVP_PKEY-DHX, EVP_KEYMGMT-DH, EVP_KEYMGMT-DHX - EVP_PKEY DH and DHX keytype and algorithm support
EVP_PKEY-DSA
EVP_PKEY-DSA, EVP_KEYMGMT-DSA - EVP_PKEY DSA keytype and algorithm support
EVP_PKEY-EC
EVP_PKEY-EC, EVP_KEYMGMT-EC - EVP_PKEY EC keytype and algorithm support
EVP_PKEY-ED25519
EVP_PKEY-X25519, EVP_PKEY-X448, EVP_PKEY-ED25519, EVP_PKEY-ED448, EVP_KEYMGMT-X25519, EVP_KEYMGMT-X448, EVP_KEYMGMT-ED25519, EVP_KEYMGMT-ED448 - EVP_PKEY X25519, X448, ED25519 and ED448 keytype and algorithm support
EVP_PKEY-ED448
EVP_PKEY-X25519, EVP_PKEY-X448, EVP_PKEY-ED25519, EVP_PKEY-ED448, EVP_KEYMGMT-X25519, EVP_KEYMGMT-X448, EVP_KEYMGMT-ED25519, EVP_KEYMGMT-ED448 - EVP_PKEY X25519, X448, ED25519 and ED448 keytype and algorithm support
EVP_PKEY-FFC
EVP_PKEY DSA and DH/DHX shared FFC parameters
EVP_PKEY-HMAC
EVP_PKEY-HMAC, EVP_KEYMGMT-HMAC, EVP_PKEY-Siphash, EVP_KEYMGMT-Siphash, EVP_PKEY-Poly1305, EVP_KEYMGMT-Poly1305, EVP_PKEY-CMAC, EVP_KEYMGMT-CMAC - EVP_PKEY legacy MAC keytypes and algorithm support
EVP_PKEY-Poly1305
EVP_PKEY-HMAC, EVP_KEYMGMT-HMAC, EVP_PKEY-Siphash, EVP_KEYMGMT-Siphash, EVP_PKEY-Poly1305, EVP_KEYMGMT-Poly1305, EVP_PKEY-CMAC, EVP_KEYMGMT-CMAC - EVP_PKEY legacy MAC keytypes and algorithm support
EVP_PKEY-RSA
EVP_PKEY-RSA, EVP_KEYMGMT-RSA, RSA - EVP_PKEY RSA keytype and algorithm support
EVP_PKEY-SM2
EVP_PKEY-SM2, EVP_KEYMGMT-SM2, SM2 - EVP_PKEY keytype support for the Chinese SM2 signature and encryption algorithms
EVP_PKEY-Siphash
EVP_PKEY-HMAC, EVP_KEYMGMT-HMAC, EVP_PKEY-Siphash, EVP_KEYMGMT-Siphash, EVP_PKEY-Poly1305, EVP_KEYMGMT-Poly1305, EVP_PKEY-CMAC, EVP_KEYMGMT-CMAC - EVP_PKEY legacy MAC keytypes and algorithm support
EVP_PKEY-X25519
EVP_PKEY-X25519, EVP_PKEY-X448, EVP_PKEY-ED25519, EVP_PKEY-ED448, EVP_KEYMGMT-X25519, EVP_KEYMGMT-X448, EVP_KEYMGMT-ED25519, EVP_KEYMGMT-ED448 - EVP_PKEY X25519, X448, ED25519 and ED448 keytype and algorithm support
EVP_PKEY-X448
EVP_PKEY-X25519, EVP_PKEY-X448, EVP_PKEY-ED25519, EVP_PKEY-ED448, EVP_KEYMGMT-X25519, EVP_KEYMGMT-X448, EVP_KEYMGMT-ED25519, EVP_KEYMGMT-ED448 - EVP_PKEY X25519, X448, ED25519 and ED448 keytype and algorithm support
EVP_RAND-CTR-DRBG
The CTR DRBG EVP_RAND implementation
EVP_RAND-HASH-DRBG
The HASH DRBG EVP_RAND implementation
EVP_RAND-HMAC-DRBG
The HMAC DRBG EVP_RAND implementation
EVP_RAND-SEED-SRC
The randomness seed source EVP_RAND implementation
EVP_RAND-TEST-RAND
The test EVP_RAND implementation
EVP_RAND
the random bit generator
EVP_SIGNATURE-CMAC
EVP_SIGNATURE-HMAC, EVP_SIGNATURE-Siphash, EVP_SIGNATURE-Poly1305, EVP_SIGNATURE-CMAC - The legacy EVP_PKEY MAC signature implementations
EVP_SIGNATURE-DSA
The EVP_PKEY DSA signature implementation