Fix X509 parsing vulnerabilities #782
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Description
This PR fixes a security vulnerability in sig_verify() function that was cloned from axTLS but did not receive the security patch.
The original issue was reported and fixed in the axTLS repository under commit 5efe2947ab45e81d84b5f707c51d1c64be52f36c. This PR applies a similar patch to eliminate the buffer overflow vulnerability.
References
https://nvd.nist.gov/vuln/detail/CVE-2018-16149
https://nvd.nist.gov/vuln/detail/CVE-2018-16150
igrr/axtls-8266@5efe294