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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 = 'eyJzdGF0dXMiOiJTcG9uc29yIiwibmFtZSI6IlNsYXZhUm96aG5ldiJ9Cg'; $data = "$header.$payload"; $signature = "QtzEgV3GSVJdhNEDSt8iZCcptG8lIN5T-EFMWb85biQqHGf0Twqj0Av5_-XHMY9iG6IVbY5jgZX0Mk24DDcrR8494rGWHkVVHIwpbYCKwi09R3O6EPL9JM9mA1WpEcLB9SUDxGZxZdHpcoAiQjx89sk3z_YeQMRiz7ZOZYzNPJJJhgb4s0oIi4xTrJ7Uu2q8yzNqyiM60QSJajyt98OrFRIydM33-a_eFDe9hCTyYVH8jNryUj4SaicYgez-hgWQ3N5z8rJPpN439U1RqpeGI1MFbIATKHFb_2_FrZnYjhHoyZ5mBvnJaE9BHlsx3T2N8AEOchxzDp4Ywz1FJmbwUw"; $verify = openssl_verify( $data, base64_decode(\strtr($signature, '-_', '+/')), $publicKey, "SHA256" ); echo base64_decode(\strtr($header, '-_', '+/')); echo base64_decode(\strtr($payload, '-_', '+/')); // echo base64_decode(\strtr($signature, '-_', '+/')); var_export($verify);