秘密鍵の作成

OpenSSLを使って秘密鍵を作成するのは、コマンド一発です。下例は 2048 bit 強度 RSA秘密鍵の作成コマンドです。

$ openssl genrsa -out private.key 2048

実行例

$ openssl genrsa -out private.key 2048
Generating RSA private key, 2048 bit long modulus
………………………………………………..+++
………+++
e is 65537 (0x10001)

作成されたか確認(サンプル)

$ cat private.key
—–BEGIN RSA PRIVATE KEY—–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—–END RSA PRIVATE KEY—–

以上です。