ASN1Sequence is not a subtype of type ASN1Integer in type cast

[certaintls]

When I was decoding this certificate, I ran into the error below:

#0      X509Utils.x509CertificateFromPem (package:basic_utils/src/X509Utils.dart:268:60)

The PEM string is below:

-----BEGIN CERTIFICATE-----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==
-----END CERTIFICATE-----

The data in text format is:

Certificate:
    Data:
        Version: 1 (0x0)
        Serial Number:
            9b:7e:06:49:a3:3e:62:b9:d5:ee:90:48:71:29:ef:57
    Signature Algorithm: sha1WithRSAEncryption
        Issuer: C=US, O=VeriSign, Inc., OU=VeriSign Trust Network, OU=(c) 1999 VeriSign, Inc. - For authorized use only, CN=VeriSign Class 3 Public Primary Certification Authority - G3
        Validity
            Not Before: Oct  1 00:00:00 1999 GMT
            Not After : Jul 16 23:59:59 2036 GMT
        Subject: C=US, O=VeriSign, Inc., OU=VeriSign Trust Network, OU=(c) 1999 VeriSign, Inc. - For authorized use only, CN=VeriSign Class 3 Public Primary Certification Authority - G3
        Subject Public Key Info:
            Public Key Algorithm: rsaEncryption
                Public-Key: (2048 bit)
                Modulus:
                    00:cb:ba:9c:52:fc:78:1f:1a:1e:6f:1b:37:73:bd:
                    f8:c9:6b:94:12:30:4f:f0:36:47:f5:d0:91:0a:f5:
                    17:c8:a5:61:c1:16:40:4d:fb:8a:61:90:e5:76:20:
                    c1:11:06:7d:ab:2c:6e:a6:f5:11:41:8e:fa:2d:ad:
                    2a:61:59:a4:67:26:4c:d0:e8:bc:52:5b:70:20:04:
                    58:d1:7a:c9:a4:69:bc:83:17:64:ad:05:8b:bc:d0:
                    58:ce:8d:8c:f5:eb:f0:42:49:0b:9d:97:27:67:32:
                    6e:e1:ae:93:15:1c:70:bc:20:4d:2f:18:de:92:88:
                    e8:6c:85:57:11:1a:e9:7e:e3:26:11:54:a2:45:96:
                    55:83:ca:30:89:e8:dc:d8:a3:ed:2a:80:3f:7f:79:
                    65:57:3e:15:20:66:08:2f:95:93:bf:aa:47:2f:a8:
                    46:97:f0:12:e2:fe:c2:0a:2b:51:e6:76:e6:b7:46:
                    b7:e2:0d:a6:cc:a8:c3:4c:59:55:89:e6:e8:53:5c:
                    1c:ea:9d:f0:62:16:0b:a7:c9:5f:0c:f0:de:c2:76:
                    ce:af:f7:6a:f2:fa:41:a6:a2:33:14:c9:e5:7a:63:
                    d3:9e:62:37:d5:85:65:9e:0e:e6:53:24:74:1b:5e:
                    1d:12:53:5b:c7:2c:e7:83:49:3b:15:ae:8a:68:b9:
                    57:97
                Exponent: 65537 (0x10001)
    Signature Algorithm: sha1WithRSAEncryption
         11:14:96:c1:ab:92:08:f7:3f:2f:c9:b2:fe:e4:5a:9f:64:de:
         db:21:4f:86:99:34:76:36:57:dd:d0:15:2f:c5:ad:7f:15:1f:
         37:62:73:3e:d4:e7:5f:ce:17:03:db:35:fa:2b:db:ae:60:09:
         5f:1e:5f:8f:6e:bb:0b:3d:ea:5a:13:1e:0c:60:6f:b5:c0:b5:
         23:22:2e:07:0b:cb:a9:74:cb:47:bb:1d:c1:d7:a5:6b:cc:2f:
         d2:42:fd:49:dd:a7:89:cf:53:ba:da:00:5a:28:bf:82:df:f8:
         ba:13:1d:50:86:82:fd:8e:30:8f:29:46:b0:1e:3d:35:da:38:
         62:16:18:4a:ad:e6:b6:51:6c:de:af:62:eb:01:d0:1e:24:fe:
         7a:8f:12:1a:12:68:b8:fb:66:99:14:14:45:5c:ae:e7:ae:69:
         17:81:2b:5a:37:c9:5e:2a:f4:c6:e2:a1:5c:54:9b:a6:54:00:
         cf:f0:f1:c1:c7:98:30:1a:3b:36:16:db:a3:6e:ea:fd:ad:b2:
         c2:da:ef:02:47:13:8a:c0:f1:b3:31:ad:4f:1c:e1:4f:9c:af:
         0f:0c:9d:f7:78:0d:d8:f4:35:56:80:da:b7:6d:17:8f:9d:1e:
         81:64:e1:fe:c5:45:ba:ad:6b:b9:0a:7a:4e:4f:4b:84:ee:4b:
         f1:7d:dd:11
SHA1 Fingerprint=13:2D:0D:45:53:4B:69:97:CD:B2:D5:C3:39:E2:55:76:60:9B:5C:C6

[Ephenodrom]

@certaintls
Then problem was that, there is no version information in the PEM. After checking the rfc again, it mentioned that if there is nor version information in the PEM you should handle it as version 1.
I updated the x509CertificateFromPem() to handle this case.

Please update to version 2.5.0. This should be now fixed.

Regards

[certaintls]

I can confirm this is fixed! Much appreciate the work and speed!