opensslコマンドで秘密鍵を標準出力に表示せずに中身を確認する方法

opensslコマンドで秘密鍵を標準出力に表示せずに中身を確認する方法を紹介します。

opensslコマンドの「rsa」サブコマンドを使用し、「-noout」オプションで秘密鍵の標準出力への出力を抑制します。

# openssl rsa -text -noout &lt; /tmp/test.key
Private-Key: (2048 bit)
modulus:
    00:e2:bc:b6:5d:5a:a0:60:9f:3a:60:c5:16:38:af:
    4a:82:6c:4d:69:94:07:4d:3d:ab:8e:74:2b:df:be:
    bb:b0:86:f5:34:24:3f:fb:10:ba:47:0b:aa:20:9d:
    de:c3:73:f7:b7:22:3f:41:0a:b1:d7:de:63:89:ab:
    f2:ff:ed:d1:56:04:26:17:d6:b4:a2:9b:b6:f5:47:
    3f:d7:b3:70:c6:c5:9c:ed:b8:29:bd:9c:11:1f:17:
    11:e4:20:f8:4b:de:46:b7:cb:8d:5c:0a:6e:b4:3c:
    c4:0d:ff:0f:84:ea:16:13:2e:a8:d9:88:40:85:8f:
    89:22:24:ac:62:87:a7:bf:5c:1e:5a:63:72:72:0c:
    99:40:1e:9b:97:42:c1:ad:67:0d:d3:74:5f:a8:47:
    06:65:eb:b8:f3:43:a2:35:77:0d:dd:e9:f9:cd:48:
    6d:c0:60:ff:0b:ef:3f:8b:b6:bd:5a:47:86:e1:1e:
    19:a5:9d:6a:8f:5b:cd:ed:45:7e:22:95:d4:ad:e2:
    60:91:57:29:42:d6:5e:5a:d7:aa:62:9e:82:cb:67:
    d1:ce:6e:a1:45:f2:b9:06:f2:e3:6d:c9:97:c2:41:
    08:7f:93:56:53:dd:2f:e8:a9:e8:b7:00:29:3d:73:
    4a:65:ea:23:a4:3d:6f:b0:d0:d6:ce:ad:ad:3a:81:
    fd:b5
publicExponent: 65537 (0x10001)
privateExponent:
    00:98:99:81:f3:5a:a7:4d:e0:5c:9d:fc:87:74:27:
    25:f2:99:89:90:61:3c:78:d3:e4:be:bf:99:37:c1:
    5a:f8:f8:1b:d7:b7:fe:07:af:be:6f:4a:7e:79:ed:
    46:9c:2d:54:af:40:b1:69:c9:14:e0:c0:a0:25:6c:
    40:e3:d6:df:69:10:e9:c2:69:92:b1:4e:33:d8:e8:
    d7:23:09:76:01:91:c6:88:87:c6:30:02:f5:d3:02:
    e7:db:ae:04:ee:aa:ee:d5:8c:7d:db:50:7a:29:7c:
    2c:47:6f:3e:b6:aa:05:a9:6b:61:e0:e6:3e:e6:a5:
    30:1a:76:ac:3e:b4:26:46:37:28:fe:d4:75:d1:03:
    3d:97:31:e8:ee:67:d0:ad:6b:f9:49:01:31:2a:9a:
    0c:3d:16:d7:df:3c:88:8c:46:b1:92:b1:b0:91:99:
    6c:93:88:ea:2c:be:32:f9:4a:00:a4:fb:cf:1b:23:
    cb:a2:dd:33:7e:dc:3d:8f:ae:05:48:bd:be:13:5b:
    5b:5c:42:20:a7:d9:bd:ba:ea:20:32:8d:1c:d5:5a:
    6f:d0:5f:3a:d4:e5:7f:41:51:85:48:6f:b1:1f:3d:
    d6:e7:b9:c0:9b:17:cd:22:32:46:39:97:aa:f7:f9:
    55:24:1c:db:b5:3a:b0:a7:6c:e4:c4:10:20:5f:f5:
    3c:11
prime1:
    00:fa:26:18:1b:28:a9:7f:41:5b:03:28:e2:17:9c:
    44:e3:a6:7e:b8:1c:9d:88:c4:db:84:0b:66:64:07:
    3d:d6:9c:c4:4d:8a:11:61:95:ff:9a:de:7a:96:11:
    98:61:bd:6a:94:ea:48:a7:65:4e:14:4c:91:38:f3:
    6c:2b:20:15:4e:be:2d:5a:39:1a:58:1b:d9:28:b0:
    d3:09:60:47:9c:60:4b:13:db:1c:ec:a7:d4:dd:22:
    95:cc:1b:af:8f:03:f0:aa:f8:b1:ba:eb:c3:43:42:
    fc:fa:32:66:8c:a9:7f:b9:a0:4d:69:89:bd:ff:6a:
    fd:2f:7c:01:87:31:84:78:cb
prime2:
    00:e8:0a:6d:88:b4:55:fe:25:36:53:b0:01:11:35:
    11:51:4f:ca:c3:2c:69:95:a3:a5:44:f5:7d:51:12:
    cf:63:43:73:25:ea:cc:44:04:5e:1b:a4:57:63:7c:
    0a:32:04:19:d0:fb:10:bf:14:73:54:b4:80:ea:7a:
    e2:6b:52:e7:60:34:53:15:c3:1d:3d:00:4c:3a:12:
    41:f2:66:4c:80:c3:fc:83:03:3a:3d:31:f3:dc:5c:
    fc:f6:7b:77:6c:0b:18:2b:b8:53:b5:e4:12:2b:45:
    8a:e5:1d:ca:2c:fb:60:35:6e:cc:04:ba:e1:a7:48:
    23:ad:5a:7d:b0:fb:19:13:7f
exponent1:
    00:f8:c6:53:e9:06:aa:72:e5:73:77:13:fc:ae:90:
    7a:2e:91:11:ab:56:c2:11:17:fe:5c:36:de:30:92:
    c7:1c:1d:b2:58:8e:fc:34:39:f2:07:7a:45:1d:e4:
    07:d1:04:88:ef:ea:84:30:fe:5e:05:70:14:69:38:
    25:96:4a:05:06:d7:b9:d0:e5:c3:5e:66:eb:b4:3d:
    0e:d4:5f:4d:38:a6:c7:63:ca:e0:dc:37:19:4a:87:
    2f:c4:da:af:e1:22:81:01:f7:ed:01:c1:a0:e2:ce:
    c7:3a:a8:4f:36:8b:07:7c:7b:81:21:79:9c:5c:5d:
    71:c8:fc:a1:a4:6b:49:9c:bb
exponent2:
    4b:33:d5:fc:10:36:2e:7f:f0:f3:7e:7f:5a:0c:50:
    e8:81:6b:bd:85:8f:52:a8:0e:d0:22:9f:d2:be:bd:
    e7:f5:dc:43:d5:ad:0d:fe:3c:61:c9:09:69:7c:b1:
    f1:33:d3:0a:1f:d4:75:99:33:27:a8:b8:7f:46:04:
    4b:b4:3a:b8:bb:3c:92:39:02:28:db:07:d9:6a:41:
    65:46:32:55:29:2f:95:66:5e:61:a6:e6:d9:ec:69:
    2f:99:24:43:27:f5:55:76:0f:eb:4b:57:78:1e:b9:
    bd:37:c2:66:81:b1:d4:9f:6c:0f:bc:61:95:cd:93:
    82:83:69:69:0a:78:3e:11
coefficient:
    00:ec:2b:d1:65:5e:77:6e:32:d3:0b:2c:f0:5e:cf:
    60:40:10:91:6f:6d:71:c2:e7:c1:df:08:dd:72:b0:
    5d:0e:24:10:0f:81:41:c1:36:7f:de:38:b9:d2:99:
    fe:d1:ac:47:75:92:5d:fc:2d:96:c8:84:8c:61:a6:
    24:98:b8:17:3a:b2:f3:54:31:b6:76:c4:ab:8d:b1:
    87:8e:b8:3a:87:de:fe:7f:0c:1b:3f:e8:62:f2:e3:
    c7:8e:88:a2:f6:58:b7:38:33:2c:61:4c:fe:cf:96:
    7f:51:30:e6:46:04:cc:87:6e:35:e9:98:5d:20:52:
    11:3b:f9:33:7a:5f:c2:fc:12
#

# openssl rsa -text -noout < /tmp/test.key

Private-Key: (2048 bit)

modulus:

00:e2:bc:b6:5d:5a:a0:60:9f:3a:60:c5:16:38:af:

4a:82:6c:4d:69:94:07:4d:3d:ab:8e:74:2b:df:be:

bb:b0:86:f5:34:24:3f:fb:10:ba:47:0b:aa:20:9d:

de:c3:73:f7:b7:22:3f:41:0a:b1:d7:de:63:89:ab:

f2:ff:ed:d1:56:04:26:17:d6:b4:a2:9b:b6:f5:47:

3f:d7:b3:70:c6:c5:9c:ed:b8:29:bd:9c:11:1f:17:

11:e4:20:f8:4b:de:46:b7:cb:8d:5c:0a:6e:b4:3c:

c4:0d:ff:0f:84:ea:16:13:2e:a8:d9:88:40:85:8f:

89:22:24:ac:62:87:a7:bf:5c:1e:5a:63:72:72:0c:

99:40:1e:9b:97:42:c1:ad:67:0d:d3:74:5f:a8:47:

06:65:eb:b8:f3:43:a2:35:77:0d:dd:e9:f9:cd:48:

6d:c0:60:ff:0b:ef:3f:8b:b6:bd:5a:47:86:e1:1e:

19:a5:9d:6a:8f:5b:cd:ed:45:7e:22:95:d4:ad:e2:

60:91:57:29:42:d6:5e:5a:d7:aa:62:9e:82:cb:67:

d1:ce:6e:a1:45:f2:b9:06:f2:e3:6d:c9:97:c2:41:

08:7f:93:56:53:dd:2f:e8:a9:e8:b7:00:29:3d:73:

4a:65:ea:23:a4:3d:6f:b0:d0:d6:ce:ad:ad:3a:81:

fd:b5

publicExponent: 65537 (0x10001)

privateExponent:

00:98:99:81:f3:5a:a7:4d:e0:5c:9d:fc:87:74:27:

25:f2:99:89:90:61:3c:78:d3:e4:be:bf:99:37:c1:

5a:f8:f8:1b:d7:b7:fe:07:af:be:6f:4a:7e:79:ed:

46:9c:2d:54:af:40:b1:69:c9:14:e0:c0:a0:25:6c:

40:e3:d6:df:69:10:e9:c2:69:92:b1:4e:33:d8:e8:

d7:23:09:76:01:91:c6:88:87:c6:30:02:f5:d3:02:

e7:db:ae:04:ee:aa:ee:d5:8c:7d:db:50:7a:29:7c:

2c:47:6f:3e:b6:aa:05:a9:6b:61:e0:e6:3e:e6:a5:

30:1a:76:ac:3e:b4:26:46:37:28:fe:d4:75:d1:03:

3d:97:31:e8:ee:67:d0:ad:6b:f9:49:01:31:2a:9a:

0c:3d:16:d7:df:3c:88:8c:46:b1:92:b1:b0:91:99:

6c:93:88:ea:2c:be:32:f9:4a:00:a4:fb:cf:1b:23:

cb:a2:dd:33:7e:dc:3d:8f:ae:05:48:bd:be:13:5b:

5b:5c:42:20:a7:d9:bd:ba:ea:20:32:8d:1c:d5:5a:

6f:d0:5f:3a:d4:e5:7f:41:51:85:48:6f:b1:1f:3d:

d6:e7:b9:c0:9b:17:cd:22:32:46:39:97:aa:f7:f9:

55:24:1c:db:b5:3a:b0:a7:6c:e4:c4:10:20:5f:f5:

3c:11

prime1:

00:fa:26:18:1b:28:a9:7f:41:5b:03:28:e2:17:9c:

44:e3:a6:7e:b8:1c:9d:88:c4:db:84:0b:66:64:07:

3d:d6:9c:c4:4d:8a:11:61:95:ff:9a:de:7a:96:11:

98:61:bd:6a:94:ea:48:a7:65:4e:14:4c:91:38:f3:

6c:2b:20:15:4e:be:2d:5a:39:1a:58:1b:d9:28:b0:

d3:09:60:47:9c:60:4b:13:db:1c:ec:a7:d4:dd:22:

95:cc:1b:af:8f:03:f0:aa:f8:b1:ba:eb:c3:43:42:

fc:fa:32:66:8c:a9:7f:b9:a0:4d:69:89:bd:ff:6a:

fd:2f:7c:01:87:31:84:78:cb

prime2:

00:e8:0a:6d:88:b4:55:fe:25:36:53:b0:01:11:35:

11:51:4f:ca:c3:2c:69:95:a3:a5:44:f5:7d:51:12:

cf:63:43:73:25:ea:cc:44:04:5e:1b:a4:57:63:7c:

0a:32:04:19:d0:fb:10:bf:14:73:54:b4:80:ea:7a:

e2:6b:52:e7:60:34:53:15:c3:1d:3d:00:4c:3a:12:

41:f2:66:4c:80:c3:fc:83:03:3a:3d:31:f3:dc:5c:

fc:f6:7b:77:6c:0b:18:2b:b8:53:b5:e4:12:2b:45:

8a:e5:1d:ca:2c:fb:60:35:6e:cc:04:ba:e1:a7:48:

23:ad:5a:7d:b0:fb:19:13:7f

exponent1:

00:f8:c6:53:e9:06:aa:72:e5:73:77:13:fc:ae:90:

7a:2e:91:11:ab:56:c2:11:17:fe:5c:36:de:30:92:

c7:1c:1d:b2:58:8e:fc:34:39:f2:07:7a:45:1d:e4:

07:d1:04:88:ef:ea:84:30:fe:5e:05:70:14:69:38:

25:96:4a:05:06:d7:b9:d0:e5:c3:5e:66:eb:b4:3d:

0e:d4:5f:4d:38:a6:c7:63:ca:e0:dc:37:19:4a:87:

2f:c4:da:af:e1:22:81:01:f7:ed:01:c1:a0:e2:ce:

c7:3a:a8:4f:36:8b:07:7c:7b:81:21:79:9c:5c:5d:

71:c8:fc:a1:a4:6b:49:9c:bb

exponent2:

4b:33:d5:fc:10:36:2e:7f:f0:f3:7e:7f:5a:0c:50:

e8:81:6b:bd:85:8f:52:a8:0e:d0:22:9f:d2:be:bd:

e7:f5:dc:43:d5:ad:0d:fe:3c:61:c9:09:69:7c:b1:

f1:33:d3:0a:1f:d4:75:99:33:27:a8:b8:7f:46:04:

4b:b4:3a:b8:bb:3c:92:39:02:28:db:07:d9:6a:41:

65:46:32:55:29:2f:95:66:5e:61:a6:e6:d9:ec:69:

2f:99:24:43:27:f5:55:76:0f:eb:4b:57:78:1e:b9:

bd:37:c2:66:81:b1:d4:9f:6c:0f:bc:61:95:cd:93:

82:83:69:69:0a:78:3e:11

coefficient:

00:ec:2b:d1:65:5e:77:6e:32:d3:0b:2c:f0:5e:cf:

60:40:10:91:6f:6d:71:c2:e7:c1:df:08:dd:72:b0:

5d:0e:24:10:0f:81:41:c1:36:7f:de:38:b9:d2:99:

fe:d1:ac:47:75:92:5d:fc:2d:96:c8:84:8c:61:a6:

24:98:b8:17:3a:b2:f3:54:31:b6:76:c4:ab:8d:b1:

87:8e:b8:3a:87:de:fe:7f:0c:1b:3f:e8:62:f2:e3:

c7:8e:88:a2:f6:58:b7:38:33:2c:61:4c:fe:cf:96:

7f:51:30:e6:46:04:cc:87:6e:35:e9:98:5d:20:52:

11:3b:f9:33:7a:5f:c2:fc:12