RSA Encryption and Digital Signature

Generate Private Key

openssl genrsa --out private.key

Generate Public Key

openssl pkey -in private.key -out public.key

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RSA Encryption

echo 'Hello Alice!' | tee plain.text

openssl rsautl -encrypt -inkey private.key -in plain.text -out encrypt.data

openssl rsautl -decrypt -inkey public.key  -in encrypt.data -out decrypt.data

cat decrypt.data

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RSA Digital Signature

echo 'Hello Bob' | tee plain.text

openssl rsautl -sign -inkey private.key -in plain.text -out sign.data

openssl rsautl -verify -inkey public.key -in sign.data -out verify.data

cat verify.data

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参考：

https://en.wikipedia.org/wiki/Public-key_cryptography

https://www.cgi.com/files/white-papers/cgi_whpr_35_pki_e.pdf

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