package main
import (
"crypto/x509"
"encoding/pem"
"fmt"
"io/ioutil"
"log"
)
func main() {
certPEMBlock, err := ioutil.ReadFile("test.pem")
if err != nil {
log.Fatal(err)
}
var blocks [][]byte
for {
var certDERBlock *pem.Block
certDERBlock, certPEMBlock = pem.Decode(certPEMBlock)
if certDERBlock == nil {
break
}
if certDERBlock.Type == "CERTIFICATE" {
blocks = append(blocks, certDERBlock.Bytes)
}
}
for _, block := range blocks {
cert, err := x509.ParseCertificate(block)
if err != nil {
log.Println(err)
continue
}
fmt.Println("Certificate:")
fmt.Printf("\tSubject: %+v\n", cert.Subject)
fmt.Printf("\tDNS Names: %+v\n", cert.DNSNames)
fmt.Printf("\tEmailAddresses: %+v\n", cert.EmailAddresses)
fmt.Printf("\tIPAddresses: %+v\n", cert.IPAddresses)
}
}
> ./test
2022/05/06 17:55:11 x509: invalid version
Certificate:
Data:
Version: Unknown (3)
Serial Number: 1 (0x1)
Signature Algorithm: sha256WithRSAEncryption
Issuer: O = VGoemFIEcw
Validity
Not Before: May 6 14:38:11 2022 GMT
Not After : May 6 14:38:11 2023 GMT
Subject: O = VGoemFIEcw
Subject Public Key Info:
Public Key Algorithm: rsaEncryption
RSA Public-Key: (2048 bit)
Modulus:
00:95:b2:31:21:69:af:8a:e2:39:c2:c4:cf:09:99:
82:09:bd:3d:ad:f7:90:88:62:b5:07:9d:eb:7d:38:
ee:ee:6d:c1:41:89:ab:6a:7b:36:9b:34:50:3e:4f:
2a:74:90:a1:8c:b5:00:68:ce:f7:2e:5b:da:8a:4c:
81:61:51:cb:2f:07:77:ad:22:16:a6:27:35:b2:22:
e7:90:27:8c:8c:4d:dc:aa:ff:f2:ba:4a:b3:08:a1:
23:0a:a1:72:7b:73:83:ae:cd:27:71:3a:9f:2d:d9:
80:2f:e6:c2:04:8e:f4:c0:b4:6c:26:e8:5f:aa:91:
50:8b:78:f3:03:15:07:b4:af:20:a9:df:86:6e:d0:
a8:e6:12:0b:3c:39:3e:1d:91:d1:b2:ff:ac:4f:fd:
d8:16:f7:44:5f:55:17:40:1c:cf:b8:51:4e:6b:ca:
be:f4:b0:40:d3:42:d8:a3:27:96:73:5f:e9:ea:1a:
7d:02:2f:64:2a:56:4c:48:f2:67:9e:8f:2e:6f:cf:
66:6c:d6:3e:d3:79:51:64:17:16:25:75:48:0c:00:
72:cc:3c:62:91:ec:f8:33:c2:19:78:45:df:12:50:
37:0c:3c:ec:c9:a6:40:42:fc:d6:93:1a:d5:c9:83:
ba:de:b7:e1:7b:ab:e0:b8:a0:0d:8a:6e:c9:10:89:
d4:17
Exponent: 65537 (0x10001)
X509v3 extensions:
X509v3 Basic Constraints:
CA:TRUE
X509v3 Subject Key Identifier:
77:BA:A5:E0:98:3C:12:50:43:4D:20:8A:74:46:6A:D8
Signature Algorithm: sha256WithRSAEncryption
0e:0a:68:bc:71:c0:be:1d:51:5a:f7:3d:e8:0d:16:c0:3c:b1:
33:3a:48:14:0c:a9:86:17:16:24:8c:b8:f1:3c:4c:06:90:fa:
24:09:f7:d9:c0:d8:ad:37:12:83:68:06:69:2a:5e:46:a7:b1:
2f:e4:4b:cc:13:10:4e:88:53:55:49:73:e0:06:b1:a4:69:0f:
63:d8:7c:e6:dd:c5:86:e8:63:04:b8:a1:08:16:ef:d9:70:6e:
49:9f:e8:6d:b6:1d:19:24:1d:63:29:4a:33:9b:8d:ff:2a:67:
11:f0:88:dd:0e:74:6a:d3:e8:79:11:2c:ce:2b:ba:08:a3:64:
cd:d2:c7:61:12:89:00:f3:26:57:72:c4:ea:ca:b6:22:54:3b:
dc:2b:d3:ef:76:8a:59:33:cf:41:8e:3f:81:02:4f:c3:a2:6e:
88:14:2f:11:bf:f5:95:23:04:44:5c:74:9a:ed:a6:c4:7e:6d:
65:8e:bb:df:5d:2a:31:a3:20:c4:21:4c:f6:84:2d:20:2f:2d:
52:a4:fe:20:3c:76:2e:65:3b:83:85:dc:75:f9:79:86:61:c2:
60:30:ee:08:8b:7c:c5:93:9f:f9:25:b3:49:8f:4b:f2:f2:33:
bd:8a:24:73:93:3f:bd:e7:8b:ed:05:dd:73:72:76:fa:3a:65:
60:8c:0c:7d
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
> go version
go version go1.18.1 linux/amd64
