1. 개인키 생성
$ openssl genrsa -out private_key.pem -3 2048
-3: Exponent 지정 기본값=65537
2048: 키 길이
$ cat private_key.pem
-----BEGIN RSA PRIVATE KEY-----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-----END RSA PRIVATE KEY-----
2. 개인키를 이용한 공개키 생성
$ openssl rsa -in private_key.pem -out public_key.pem -pubout
$ cat public_key.pem
-----BEGIN PUBLIC KEY-----
MIIBIDANBgkqhkiG9w0BAQEFAAOCAQ0AMIIBCAKCAQEA0jq/cYwTBOWZgQ/kX2L7
XjzKTRPPmJtw4I+UUErrUtGuMre+5J4Wikoa1QLwWj/EllR7x+rZRa5tCbKyQWxT
3TRGfbUUOMrpjDzIE9rrGK8gGat+e3OHTsOnk1tqRUeednSCVyTszOQomTjSQiTe
6UhCul4okAPHBgd6yeq8B/wjwFkSbFmMHtnpMTmbm8Iui70Cl3TJ0WEBnThwJCwy
c+jNZPJGOf0t6OaNmJGZ1aKKUZsQjXRvIR1v1PuvWWwfNquGaiX3iP0eHLprD9Aj
3O7p1OAd6StmRreKgM6awhGtJCkysJk2xdqvMuuDUuliPjSwZYGFtcw5Opm7Ir7G
ywIBAw==
-----END PUBLIC KEY-----
3. pem파일을 rsa der로 변환
$openssl rsa -pubin -text -in public_key.pem > out.pub
$ cat out.pub
Public-Key: (2048 bit)
Modulus:
00:d2:3a:bf:71:8c:13:04:e5:99:81:0f:e4:5f:62:
fb:5e:3c:ca:4d:13:cf:98:9b:70:e0:8f:94:50:4a:
eb:52:d1:ae:32:b7:be:e4:9e:16:8a:4a:1a:d5:02:
f0:5a:3f:c4:96:54:7b:c7:ea:d9:45:ae:6d:09:b2:
b2:41:6c:53:dd:34:46:7d:b5:14:38:ca:e9:8c:3c:
c8:13:da:eb:18:af:20:19:ab:7e:7b:73:87:4e:c3:
a7:93:5b:6a:45:47:9e:76:74:82:57:24:ec:cc:e4:
28:99:38:d2:42:24:de:e9:48:42:ba:5e:28:90:03:
c7:06:07:7a:c9:ea:bc:07:fc:23:c0:59:12:6c:59:
8c:1e:d9:e9:31:39:9b:9b:c2:2e:8b:bd:02:97:74:
c9:d1:61:01:9d:38:70:24:2c:32:73:e8:cd:64:f2:
46:39:fd:2d:e8:e6:8d:98:91:99:d5:a2:8a:51:9b:
10:8d:74:6f:21:1d:6f:d4:fb:af:59:6c:1f:36:ab:
86:6a:25:f7:88:fd:1e:1c:ba:6b:0f:d0:23:dc:ee:
e9:d4:e0:1d:e9:2b:66:46:b7:8a:80:ce:9a:c2:11:
ad:24:29:32:b0:99:36:c5:da:af:32:eb:83:52:e9:
62:3e:34:b0:65:81:85:b5:cc:39:3a:99:bb:22:be:
c6:cb
Exponent: 3 (0x3)
-----BEGIN PUBLIC KEY-----
MIIBIDANBgkqhkiG9w0BAQEFAAOCAQ0AMIIBCAKCAQEA0jq/cYwTBOWZgQ/kX2L7
XjzKTRPPmJtw4I+UUErrUtGuMre+5J4Wikoa1QLwWj/EllR7x+rZRa5tCbKyQWxT
3TRGfbUUOMrpjDzIE9rrGK8gGat+e3OHTsOnk1tqRUeednSCVyTszOQomTjSQiTe
6UhCul4okAPHBgd6yeq8B/wjwFkSbFmMHtnpMTmbm8Iui70Cl3TJ0WEBnThwJCwy
c+jNZPJGOf0t6OaNmJGZ1aKKUZsQjXRvIR1v1PuvWWwfNquGaiX3iP0eHLprD9Aj
3O7p1OAd6StmRreKgM6awhGtJCkysJk2xdqvMuuDUuliPjSwZYGFtcw5Opm7Ir7G
ywIBAw==
-----END PUBLIC KEY-----
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