openssl/doc/life-cycles/pkey.dot

strict digraph pkey {
    bgcolor="transparent";
    layout=circo

    begin [label=start, color="#deeaee", style="filled"];
    newed [fontcolor="#c94c4c", style="solid"];
    digestsign [label="digest sign", fontcolor="#AB3910", color="#AB3910"]
    verify [fontcolor="#F8CF2C", color="#F8CF2C"]
    verifyrecover [label="verify recover", fontcolor="#B19FF9", color="#B19FF9"]
    encrypt [fontcolor="#63AAC0", color="#63AAC0"]
    decrypt [fontcolor="#425F06", color="#425F06"]
    derive [fontcolor="#FEA303", color="#FEA303"]
    encapsulate [fontcolor="#D95980", color="#D95980"]
    decapsulate [fontcolor="#A16AE8", color="#A16AE8"]
    paramgen [label="parameter\ngeneration", fontcolor="#2879C0", color="#2879C0"]
    keygen [label="key\ngeneration", fontcolor="#2F7604", color="#2F7604"]

    begin -> newed [label="EVP_PKEY_CTX_new"];

    newed -> digestsign [label="EVP_PKEY_sign_init", color="#AB3910", fontcolor="#AB3910"];
    digestsign -> digestsign [label="EVP_PKEY_sign", color="#AB3910", fontcolor="#AB3910"];

    newed -> verify [label="EVP_PKEY_verify_init", fontcolor="#F8CF2C", color="#F8CF2C"];
    verify -> verify [label="EVP_PKEY_verify", fontcolor="#F8CF2C", color="#F8CF2C"];

    newed -> verifyrecover [label="EVP_PKEY_verify_recover_init", fontcolor="#B19FF9", color="#B19FF9"];
    verifyrecover -> verifyrecover [label="EVP_PKEY_verify_recover", fontcolor="#B19FF9", color="#B19FF9"];

    newed -> encrypt [label="EVP_PKEY_encrypt_init", fontcolor="#63AAC0", color="#63AAC0"];
    encrypt -> encrypt [label="EVP_PKEY_encrypt", fontcolor="#63AAC0", color="#63AAC0"];

    newed -> decrypt [label="EVP_PKEY_decrypt_init", fontcolor="#425F06", color="#425F06"];
    decrypt -> decrypt [label="EVP_PKEY_decrypt", fontcolor="#425F06", color="#425F06"];

    newed -> derive [label="EVP_PKEY_derive_init", fontcolor="#FEA303", color="#FEA303"];
    derive -> derive [label="EVP_PKEY_derive\nEVP_PKEY_derive_set_peer", fontcolor="#FEA303", color="#FEA303"];

    newed -> encapsulate [label="EVP_PKEY_encapsulate_init", fontcolor="#D95980", color="#D95980"];
    encapsulate -> encapsulate [label="EVP_PKEY_encapsulate", fontcolor="#D95980", color="#D95980"];

    newed -> decapsulate [label="EVP_PKEY_decapsulate_init", fontcolor="#A16AE8", color="#A16AE8"];
    decapsulate -> decapsulate [label="EVP_PKEY_decapsulate", fontcolor="#A16AE8", color="#A16AE8"];

    newed -> paramgen [label="EVP_PKEY_paramgen_init", fontcolor="#2879C0", color="#2879C0"];
    paramgen -> paramgen [label="EVP_PKEY_paramgen\nEVP_PKEY_gen", fontcolor="#2879C0", color="#2879C0"];

    newed -> keygen [label="EVP_PKEY_keygen_init", fontcolor="#2F7604", color="#2F7604"];
    keygen -> keygen [label="EVP_PKEY_keygen\nEVP_PKEY_gen", fontcolor="#2F7604", color="#2F7604"];
}