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====== OpenSSL ======

===== Tworzenie certyfikatu self-signed =====
Konfig OpenSSL-a (wyedytuj wg. uznania):
<code bash>
cat > ssl.conf <<EOF
[ req ]
default_bits       = 4096
distinguished_name = req_distinguished_name
req_extensions     = req_ext

[ req_distinguished_name ]
countryName                 = Country Name (2 letter code)
countryName_default         = PL
stateOrProvinceName         = State or Province Name (full name)
stateOrProvinceName_default = Poland
localityName                = Locality Name (eg, city)
localityName_default        = Warsaw
organizationName            = Organization Name (eg, company)
organizationName_default    = None Inc.
commonName                  = Common Name (e.g. server FQDN or YOUR name)
commonName_max              = 64
commonName_default          = localhost

[ req_ext ]
subjectAltName = @alt_names

[alt_names]
DNS.1 = localhost
DNS.2 = localhost.localdomain
EOF
</code>

Wklejka do generowania:

<code bash>
openssl genrsa -out localhost.key 4096
openssl req -new -sha256 -batch -key localhost.key -out localhost.csr -config ssl.conf
openssl x509 -req -days 3650 -in localhost.csr -signkey localhost.key -out localhost.crt -extensions req_ext -extfile ssl.conf
</code>

==== Ustawianie/usuwanie hasła z klucza ====

<code>
openssl rsa -des -in localhost.key -out localhost.key.enc
</code>

<code>
openssl rsa -in localhost.key.enc -out localhost.key
</code>

===== Weryfikacje =====
==== Sprawdzanie certyfikatu ====

<code>
openssl x509 -in localhost.crt -text -noout
</code>

Jeśli mamy podpisany przez CA:

<code>
openssl verify -CAfile CA.pem localhost.crt
</code>

==== Sprawdzanie pary: certyfikat + klucz ====
W obu przypadkach wartość ''modulus'' powinna być taka sama:
<code>
openssl x509 -noout -modulus -in localhost.crt
openssl rsa -noout -modulus -in localhost.key
</code>

==== Sprawdzanie Seriala, odcisków MD5 i SHA256 ====
Serial:
<code>
openssl x509 -noout -serial -in localhost.crt
</code>

Odcisk MD5:
<code>
openssl x509 -noout -fingerprint -in localhost.crt
</code>

Odcisk SHA256:
<code>
openssl x509 -noout -fingerprint -sha256 -in localhost.crt
</code>

===== Konwersja =====

==== DER -> PEM ====
<code>
openssl x509 -inform der -in localhost.der -out localhost.pem
</code>

==== PKCS#12 -> PEM ====
Wynikiem będzie zestaw certyfikatów i klucza w jednym pliku PEM.
<code>
openssl pkcs12 -nodes -in keyStore.p12 -out keyStore.pem 
</code>

==== PEM -> DER ====
<code>
openssl x509 -outform der -in localhost.pem -out localhost.der
</code>

==== PEM -> PKCS#12 ====
<code>
openssl pkcs12 -export -inkey localhost.key -in localhost.pem -certfile ca.pem -out certificate.p12
</code>

====== Credits =====
https://gist.github.com/croxton/ebfb5f3ac143cd86542788f972434c96