Update cheatsheets

openssl-dgst

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# openssl dgst
+
+> OpenSSL command to generate digest values and perform signature operations.
+> More information: <https://www.openssl.org/docs/manmaster/man1/openssl-dgst.html>.
+
+- Calculate the SHA256 digest for a file, saving the result to a specific file:
+
+`openssl dgst -sha256 -binary -out {{output_file}} {{input_file}}`
+
+- Sign a file using an RSA key, saving the result to a specific file:
+
+`openssl dgst -sign {{private_key_file}} -sha256 -sigopt rsa_padding_mode:pss -out {{output_file}} {{input_file}}`
+
+- Verify an RSA signature:
+
+`openssl dgst -verify {{public_key_file}} -signature {{signature_file}} -sigopt rsa_padding_mode:pss {{signature_message_file}}`
+
+- Sign a file using and ECDSA key:
+
+`openssl dgst -sign {{private_key_file}} -sha256 -out {{output_file}} {{input_file}}`
+
+- Verify an ECDSA signature:
+
+`openssl dgst -verify {{public_key_file}} -signature {{signature_file}} {{signature_message_file}}`