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Creating Self Signed CA Signing Certificate with OpenSSL
Endi S. Dewata edited this page Jun 7, 2021
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5 revisions
This page describes the several procedures to generate self-signed CA signing certificate using OpenSSL.
To generate a self-signed CA signing certificate with a new key:
$ openssl req \
-newkey rsa:2048 \
-nodes \
-keyout ca_signing.key \
-x509 \
-days 365 \
-subj "/O=EXAMPLE/CN=Certificate Authority"
-out ca_signing.crt \
To generate a self-signed CA certificate with an existing key:
$ openssl req \
-new \
-nodes \
-key ca_signing.key \
-x509 \
-days 365 \
-subj "/O=EXAMPLE/CN=Certificate Authority" \
-out ca_signing.crt \
Prepare an OpenSSL configuration file (e.g. openssl.cfg):
HOME = tmp RANDFILE = tmp/random.bin #################################################################### [ ca ] default_ca = CA_default # The default ca section [ CA_default ] default_days = 1000 # how long to certify for default_crl_days = 30 # how long before next CRL default_md = sha256 # use public key default MD preserve = no # keep passed DN ordering x509_extensions = ca_extensions # The extensions to add to the cert email_in_dn = no # Don't concat the email in the DN copy_extensions = copy # Required to copy SANs from CSR to cert #################################################################### [ req ] default_bits = 4096 default_keyfile = tmp/external.key distinguished_name = ca_distinguished_name x509_extensions = ca_extensions string_mask = utf8only #################################################################### [ ca_distinguished_name ] countryName = Country Name (2 letter code) countryName_default = US stateOrProvinceName = State or Province Name (full name) stateOrProvinceName_default = Maryland localityName = Locality Name (eg, city) localityName_default = Baltimore organizationName = Organization Name (eg, company) organizationName_default = Test CA, Limited organizationalUnitName = Organizational Unit (eg, division) organizationalUnitName_default = Server Research Department commonName = Common Name (e.g. server FQDN or YOUR name) commonName_default = Test CA emailAddress = Email Address emailAddress_default = [email protected] #################################################################### [ ca_extensions ] subjectKeyIdentifier = hash authorityKeyIdentifier = keyid:always, issuer basicConstraints = critical, CA:true keyUsage = critical, digitalSignature, nonRepudiation, keyCertSign, cRLSign
Then execute the following command:
$ openssl req \ -config openssl.cfg \ -nodes \ -keyout ca_signing.key \ -x509 \ -days 365 \ -subj "/O=EXAMPLE,CN=Certificate Authority" \ -out ca_signing.crt
$ openssl x509 -text -noout -in ca_signing.crt
Certificate:
Data:
Version: 3 (0x2)
Serial Number:
c1:e2:0d:78:e7:67:52:7a
Signature Algorithm: sha256WithRSAEncryption
Issuer: O = EXAMPLE, CN = Certificate Authority
Validity
Not Before: Mar 5 17:43:21 2019 GMT
Not After : Mar 4 17:43:21 2020 GMT
Subject: O = EXAMPLE, CN = Certificate Authority
Subject Public Key Info:
Public Key Algorithm: rsaEncryption
Public-Key: (2048 bit)
Modulus:
00:c0:ef:ee:8b:e4:0f:e2:55:11:d9:4b:9d:c6:03:
9e:1c:db:2c:ec:f6:73:70:f7:ed:fa:1b:b9:f9:c7:
1c:dc:0d:3b:07:cb:66:3f:16:74:10:b3:c0:62:6f:
f9:71:85:f8:3d:89:21:c2:b2:63:06:0f:47:e1:ce:
83:ec:42:96:1b:ae:56:57:84:80:c5:6f:83:13:3e:
1d:ca:4c:e2:17:b2:04:3d:90:73:33:68:d5:d7:d7:
41:10:72:d8:05:ef:46:7f:01:ca:1f:90:eb:36:cd:
ed:5a:0d:bb:c6:5a:31:03:b1:67:1f:66:10:08:83:
67:b5:b1:1d:5a:c4:a7:66:b8:42:b2:3a:23:d8:0a:
63:a4:b2:10:74:73:55:3e:3c:24:49:4b:16:89:30:
86:43:29:17:cb:e1:82:d8:f4:5f:1a:f9:10:42:18:
c8:23:0e:ce:f6:4b:b6:97:b2:1f:c3:d4:ae:2d:c2:
bf:f8:57:d5:16:4a:8d:6a:8a:2d:22:52:2a:2a:e7:
64:b8:59:a0:41:33:5e:db:0e:9a:87:9e:64:17:91:
89:a6:e2:74:f2:ec:c6:a3:df:58:5c:78:f8:10:bb:
b7:95:70:e4:56:88:b7:69:8f:87:ea:ba:6e:36:62:
a4:ee:2e:5b:3f:e9:e1:af:70:a6:a6:a4:bb:38:0d:
b1:85
Exponent: 65537 (0x10001)
X509v3 extensions:
X509v3 Subject Key Identifier:
2B:E5:7D:8F:4E:CC:05:6C:62:92:44:A2:AA:FB:41:F8:2E:3B:DB:F9
X509v3 Authority Key Identifier:
keyid:2B:E5:7D:8F:4E:CC:05:6C:62:92:44:A2:AA:FB:41:F8:2E:3B:DB:F9
X509v3 Basic Constraints: critical
CA:TRUE
Signature Algorithm: sha256WithRSAEncryption
70:75:95:68:d3:e9:b3:f5:8c:09:24:e9:e4:d5:c0:15:36:a4:
6a:06:a1:83:06:57:77:d6:40:63:a6:59:03:f9:4f:bf:a7:1c:
a9:14:8c:d3:11:00:2a:02:da:11:65:ca:9c:17:f2:a4:3b:d1:
5e:4e:e1:4f:aa:ae:7c:43:3f:71:1a:4f:5c:cf:b0:e0:74:c7:
80:c8:22:ba:45:82:e7:4b:f4:4a:a7:49:b2:74:92:f4:b3:dd:
ac:30:3b:cc:7f:36:fc:7b:4d:ab:42:9d:c9:93:c3:d7:35:e1:
ea:9e:93:6a:6e:85:c4:16:bf:11:f3:5a:46:83:1d:df:56:c4:
fa:d9:24:57:ed:6d:2b:27:64:62:b6:03:fc:9b:0c:29:d4:03:
90:43:78:24:83:6f:98:2e:7d:37:7c:81:b4:b8:c1:2d:4d:c1:
87:1b:6e:b4:32:1e:72:c9:94:57:08:17:86:8b:91:b6:2e:5f:
56:e7:71:8a:7c:a5:0b:f7:a5:9d:c2:fe:87:c0:fb:20:49:bc:
f1:0b:4d:a1:e3:0c:2e:34:31:37:63:14:57:cc:41:33:d9:b3:
00:57:da:28:a6:a0:64:3f:3e:ba:01:1a:0e:fe:ac:b8:36:ba:
4e:40:1d:f7:f7:a2:8f:d5:d5:7d:12:4b:3a:37:22:9b:c7:87:
48:e1:83:d2
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