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<?php $publicKey = <<<PUBLIC_KEY -----BEGIN PUBLIC KEY----- MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAq5h79Trk+6baxxJVvjz0 zpG6T0o+HXiLOKUjQOoN1x9fLR5c124rMSJL78EaTNdgucGfJjSerjXfd7invj2V etR+i+HiUkmRLBpY6979h62joLoyzfl4NPUU9WyTtTdv8Gaw1RfLBp6HcML+ddHt x1ozoXyh56GtNaqrTe0UCJlt+wHndVPm4fm5mcFRC8Lt6+zSjN3FmT754kuh1+fn 2M9YVFiOPyVZRuo+fmIo693C0LLAhC6ZeOVJBvyfTTPPk8fIn574a5F538bfVQBX 1z7hT+lwVZlvyX6idiWE6RZSjxctwJhoXIyzjbSX0k7b+QxVfDBb6IAmXiO74vNH twIDAQAB -----END PUBLIC KEY----- PUBLIC_KEY; $header = 'eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9Cg'; $payload = 'eyJzdGF0dXMiOiJTcG9uc29yIiwibmFtZSI6IlNsYXZhUm96aG5ldiIsICJleHBpcmVkIjowfQo'; $data = "$header.$payload"; $signature = "h2hYeG077sHGea-ZktD3ns-hZAnVlmb4k2_rTnKPM4Y-8-S6BcV2nEiKIi9xu7stZUhQYvi-3JVQM5tkthRMotOUaSK-019Hm1fK-jbVv2PDPOTbWk-8pR3n7jbNbIb3JBclm7g-ZtMdjqRE7pD2n2iaw4km6vhMehchQ5lsqiqjgV3zHZaUPpdNZekWUbrabWUy1yZQrVbDrLaSR-s-JhHJXHnmi_tWm9jfziPNKrhE58y0c_SWK1HaWbWaELX0cYF8zKaq7Ux9I-z-JQCcErG3B1YZL4KezZrkuyRQL6KXx42zyok10VA7B3oktasE8gIYW_aK2eMAAy64qemErw"; $verify = openssl_verify( $data, base64_decode(strtr($signature, '-_', '+/')), $publicKey ); echo base64_decode(\strtr($header, '-_', '+/')); echo base64_decode(\strtr($payload, '-_', '+/')); var_export($verify);