CURLINFO_SSL_VERIFYRESULT error codes:
0: ok the operation was successful.
2 : unable to get issuer certificate
3: unable to get certificate CRL
4: unable to decrypt certificate's signature
5: unable to decrypt CRL's signature
6: unable to decode issuer public key
7: certificate signature failure
8: CRL signature failure
9: certificate is not yet valid
10: certificate has expired
11: CRL is not yet valid
12:CRL has expired
13: format error in certificate's notBefore field
14: format error in certificate's notAfter field
15: format error in CRL's lastUpdate field
16: format error in CRL's nextUpdate field
17: out of memory
18: self signed certificate
19: self signed certificate in certificate chain
20: unable to get local issuer certificate
21:unable to verify the first certificate
22: certificate chain too long
23: certificate revoked
24: invalid CA certificate
25: path length constraint exceeded
26: unsupported certificate purpose
27: certificate not trusted
28: certificate rejected
29: subject issuer mismatch
30: authority and subject key identifier mismatch
31: authority and issuer serial number mismatch
32: key usage does not include certificate signing
50: application verification failure
details at http://www.openssl.org/docs/apps/verify.html#VERIFY_OPERATION