$ openssl
OpenSSL> version
OpenSSL 1.1.0g 2 Nov 2017
OpenSSL> help
Standard commands
asn1parse ca ciphers cms
crl crl2pkcs7 dgst dhparam
dsa dsaparam ec ecparam
enc engine errstr exit
gendsa genpkey genrsa help
list nseq ocsp passwd
pkcs12 pkcs7 pkcs8 pkey
pkeyparam pkeyutl prime rand
rehash req rsa rsautl
s_client s_server s_time sess_id
smime speed spkac srp
ts verify version x509
Message Digest commands (see the `dgst' command for more details)
blake2b512 blake2s256 gost md4
md5 mdc2 rmd160 sha1
sha224 sha256 sha384 sha512
Cipher commands (see the `enc' command for more details)
aes-128-cbc aes-128-ecb aes-192-cbc aes-192-ecb
aes-256-cbc aes-256-ecb base64 bf
bf-cbc bf-cfb bf-ecb bf-ofb
camellia-128-cbc camellia-128-ecb camellia-192-cbc camellia-192-ecb
camellia-256-cbc camellia-256-ecb cast cast-cbc
cast5-cbc cast5-cfb cast5-ecb cast5-ofb
des des-cbc des-cfb des-ecb
des-ede des-ede-cbc des-ede-cfb des-ede-ofb
des-ede3 des-ede3-cbc des-ede3-cfb des-ede3-ofb
des-ofb des3 desx idea
idea-cbc idea-cfb idea-ecb idea-ofb
rc2 rc2-40-cbc rc2-64-cbc rc2-cbc
rc2-cfb rc2-ecb rc2-ofb rc4
rc4-40 seed seed-cbc seed-cfb
seed-ecb seed-ofb
OpenSSL> req -x509 -newkey rsa:8192 -out cert.pem -keyout cert.privkey.pem
Generating a 8192 bit RSA private key
................................................................................................++
................................................................................++
writing new private key to 'cert.privkey.pem'
Enter PEM pass phrase:
Verifying - Enter PEM pass phrase:
-----
You are about to be asked to enter information that will be incorporated
into your certificate request.
What you are about to enter is what is called a Distinguished Name or a DN.
There are quite a few fields but you can leave some blank
For some fields there will be a default value,
If you enter '.', the field will be left blank.
-----
Country Name (2 letter code) [AU]:.
State or Province Name (full name) [Some-State]:.
Locality Name (eg, city) []:.
Organization Name (eg, company) [Internet Widgits Pty Ltd]:.
Organizational Unit Name (eg, section) []:.
Common Name (e.g. server FQDN or YOUR name) []:Test cert
Email Address []:.
OpenSSL> asn1parse -in cert.privkey.pem
0:d=0 hl=4 l=4764 cons: SEQUENCE
4:d=1 hl=2 l= 78 cons: SEQUENCE
6:d=2 hl=2 l= 9 prim: OBJECT :PBES2
17:d=2 hl=2 l= 65 cons: SEQUENCE
19:d=3 hl=2 l= 41 cons: SEQUENCE
21:d=4 hl=2 l= 9 prim: OBJECT :PBKDF2
32:d=4 hl=2 l= 28 cons: SEQUENCE
34:d=5 hl=2 l= 8 prim: OCTET STRING [HEX DUMP]:[...hex dump cut...]
44:d=5 hl=2 l= 2 prim: INTEGER :0800
48:d=5 hl=2 l= 12 cons: SEQUENCE
50:d=6 hl=2 l= 8 prim: OBJECT :hmacWithSHA256
60:d=6 hl=2 l= 0 prim: NULL
62:d=3 hl=2 l= 20 cons: SEQUENCE
64:d=4 hl=2 l= 8 prim: OBJECT :des-ede3-cbc
74:d=4 hl=2 l= 8 prim: OCTET STRING [HEX DUMP]:[...hex dump cut...]
84:d=1 hl=4 l=4680 prim: OCTET STRING [HEX DUMP]:[...huge hex dump cut...]