使用openssl 产生私钥,并通过私钥产生公钥的方法
openssl genrsa -out privkey.key 1024 //生成一个RSA privkey.key的私钥

cat privkey.key
-----BEGIN RSA PRIVATE KEY----- MIICXgIBAAKBgQDKZaUst2ZXq9gDgOmSGfp/F8C1lynC7P0Gv99aRRwKFJLIYicz iNScBigrFiHwpZZLjcceNThn1OiZkRgApvb2h3stTmvsYVBt7d+o5sNIo8nVcAqm e2HPa3QFa79WnJKgKK95vFgzIkcBdl7E/9DJc4/JnLC0iknlPT6A8UWumwIDAQAB AoGBAJ9YqVNsTPHnRFl1y+6P72zSOZF+Io3p4UfIFkPOt0Wkbu++fxiOuLziCAvs D+qTo6F2TPcWdYMh18LXver9iN6l4RzeWPf3EiRlL3J8ATeKrDYlPXNDAUJ35RMH KlLk6WK+ypd2sIxVaGFdYl+YqtwzqsEvsdl4ycj2EhzdVhu5AkEA9SNF0T7zj00q EOW6/lnSGi+P2EZTnCpKjiyM50kPzqqBp0Yn5vn9nyeKI4BEY8SRlEA+8GE+fiEQ OeQpViI87wJBANNdirN9hpnO2qmKeGB+C7OSy7SnqJH2mZpQ0ZSlEEGQQxnSq+dW rqm8Jbj9Fx4JmqsqTl+XEKkTlUXmydziQRUCQQDh391+H9ZGraBcL4IsydC5hiex 7aMu2x0VgeFXX8/r6tpKqm8r+h+C3ekAKzlZAI/vnX8g+Ume6JJN9XlNP4ELAkAt 9Ub1ZDPiObId7zfhc0bEEwUsENB8fGxFu5D2izWPq/iLIt2x/Y0Y5wokwRNHurrg wOAttMEwoktw2Y/G8YNJAkEAiV4NDBeBE0LtOE0FJTEMExoGzJq/L+s3JgSGU1bM AywRVz/Ubknl1B08S8f7hf+0d9N2YtaRID47SP6+c6qLbQ== -----END RSA PRIVATE KEY-----
openssl rsa -in privkey.key -pubout -out pubkey.key

cat pubkey.key
-----BEGIN PUBLIC KEY----- MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDKZaUst2ZXq9gDgOmSGfp/F8C1 lynC7P0Gv99aRRwKFJLIYicziNScBigrFiHwpZZLjcceNThn1OiZkRgApvb2h3st TmvsYVBt7d+o5sNIo8nVcAqme2HPa3QFa79WnJKgKK95vFgzIkcBdl7E/9DJc4/J nLC0iknlPT6A8UWumwIDAQAB -----END PUBLIC KEY-----
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