ChainFromDir reads all the {IA}-V*.crt (e.g., ISD1-ASff00_0_1-V17.crt) files contained directly in dir (no subdirectories), and out of those that match IA ia returns the newest one.

ChainFromSlice creates a certificate chain from a list of certificates.

DefaultIssuerCertValidity is the default validity time of an issuer certificate in seconds.

DefaultLeafCertValidity is the default validity time of a leaf certificate in seconds.

Error strings.

Chain contains two certificates, one for the leaf and one for the issuer.