PasteBox
It looks like yo don't have javascript enabled for this site. But thats ok. You can still submit and read the content of pastes by using a few curl/openssl/gunzip commands.
Get the paste
Lets say you have the following link https://domain.tld/#/FeLq42kIQV69hQCJA8m9lg!5EDDziaCjceHjeG5UQ9M7-6wgyq5YVfysAEZ0wUNy6w. Query the REST endpoint for the ID or part before the ! in the url hash.
$ curl -i https://domain.tld/api/FeLq42kIQV69hQCJA8m9lg
Decrypt
Using Openssl you want to remove the header and pass the remaining base64 for decryption. The cypher used is aes-256-cbc. The key is the portion after the ! in the link.
... | sed '1,/^$/d' | openssl aes-256-cbc -d -a -k 5EDDziaCjceHjeG5UQ9M7-6wgyq5YVfysAEZ0wUNy6w
Deflate
If as in the provided example the paste has been compressed pass it through gunzip. The header will have "zip: true" if it has been compressed.
... | gzip -dc
Example Output
$ curl -s "https://domain.tld/api/FeLq42kIQV69hQCJA8m9lg" | sed "1,/^$/d" | openssl aes-256-cbc -d -a -k 5EDDziaCjceHjeG5UQ9M7-6wgyq5YVfysAEZ0wUNy6w | gzip -dc
. ____ .-.
.-"` `",( __\_
.-==:;-._ .' .-. `'.
.' `"-:'-/ ( \} -=a .)
/ \/ \,== `- __..-'`
'-' | | | .'\ `;
\ _/---'\ ( `"`
/.`._ ) \ `; Sour.is Paste
\`-/.' `"`
`"\`-.