Commands: Print leaf cert's SHA256 in tls ping (#5628)

And https://github.com/XTLS/Xray-core/pull/5628#issuecomment-3828445442

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Co-authored-by: RPRX <63339210+RPRX@users.noreply.github.com>

infra/conf/transport_internet.go

@@ -639,10 +639,14 @@ func (c *TLSConfig) Build() (proto.Message, error) {
 			if v == "" {
 				continue
 			}
-			hashValue, err := hex.DecodeString(v)
+			// remove colons for OpenSSL format
+			hashValue, err := hex.DecodeString(strings.ReplaceAll(v, ":", ""))
 			if err != nil {
 				return nil, err
 			}
+			if len(hashValue) != 32 {
+				return nil, errors.New("incorrect pinnedPeerCertSha256 length: ", v)
+			}
 			config.PinnedPeerCertSha256 = append(config.PinnedPeerCertSha256, hashValue)
 		}
 	}