diff --git a/src/lib/WebAuthn/Attestation/AttestationObject.php b/src/lib/WebAuthn/Attestation/AttestationObject.php
new file mode 100644
index 0000000..65151ea
--- /dev/null
+++ b/src/lib/WebAuthn/Attestation/AttestationObject.php
@@ -0,0 +1,179 @@
+<?php
+
+namespace lbuchs\WebAuthn\Attestation;
+use lbuchs\WebAuthn\WebAuthnException;
+use lbuchs\WebAuthn\CBOR\CborDecoder;
+use lbuchs\WebAuthn\Binary\ByteBuffer;
+
+/**
+ * @author Lukas Buchs
+ * @license https://github.com/lbuchs/WebAuthn/blob/master/LICENSE MIT
+ */
+class AttestationObject {
+    private $_authenticatorData;
+    private $_attestationFormat;
+    private $_attestationFormatName;
+
+    public function __construct($binary , $allowedFormats) {
+        $enc = CborDecoder::decode($binary);
+        // validation
+        if (!\is_array($enc) || !\array_key_exists('fmt', $enc) || !is_string($enc['fmt'])) {
+            throw new WebAuthnException('invalid attestation format', WebAuthnException::INVALID_DATA);
+        }
+
+        if (!\array_key_exists('attStmt', $enc) || !\is_array($enc['attStmt'])) {
+            throw new WebAuthnException('invalid attestation format (attStmt not available)', WebAuthnException::INVALID_DATA);
+        }
+
+        if (!\array_key_exists('authData', $enc) || !\is_object($enc['authData']) || !($enc['authData'] instanceof ByteBuffer)) {
+            throw new WebAuthnException('invalid attestation format (authData not available)', WebAuthnException::INVALID_DATA);
+        }
+
+        $this->_authenticatorData = new AuthenticatorData($enc['authData']->getBinaryString());
+        $this->_attestationFormatName = $enc['fmt'];
+
+        // Format ok?
+        if (!in_array($this->_attestationFormatName, $allowedFormats)) {
+            throw new WebAuthnException('invalid atttestation format: ' . $this->_attestationFormatName, WebAuthnException::INVALID_DATA);
+        }
+
+
+        switch ($this->_attestationFormatName) {
+            case 'android-key': $this->_attestationFormat = new Format\AndroidKey($enc, $this->_authenticatorData); break;
+            case 'android-safetynet': $this->_attestationFormat = new Format\AndroidSafetyNet($enc, $this->_authenticatorData); break;
+            case 'apple': $this->_attestationFormat = new Format\Apple($enc, $this->_authenticatorData); break;
+            case 'fido-u2f': $this->_attestationFormat = new Format\U2f($enc, $this->_authenticatorData); break;
+            case 'none': $this->_attestationFormat = new Format\None($enc, $this->_authenticatorData); break;
+            case 'packed': $this->_attestationFormat = new Format\Packed($enc, $this->_authenticatorData); break;
+            case 'tpm': $this->_attestationFormat = new Format\Tpm($enc, $this->_authenticatorData); break;
+            default: throw new WebAuthnException('invalid attestation format: ' . $enc['fmt'], WebAuthnException::INVALID_DATA);
+        }
+    }
+
+    /**
+     * returns the attestation format name
+     * @return string
+     */
+    public function getAttestationFormatName() {
+        return $this->_attestationFormatName;
+    }
+
+    /**
+     * returns the attestation format class
+     * @return Format\FormatBase
+     */
+    public function getAttestationFormat() {
+        return $this->_attestationFormat;
+    }
+
+    /**
+     * returns the attestation public key in PEM format
+     * @return AuthenticatorData
+     */
+    public function getAuthenticatorData() {
+        return $this->_authenticatorData;
+    }
+
+    /**
+     * returns the certificate chain as PEM
+     * @return string|null
+     */
+    public function getCertificateChain() {
+        return $this->_attestationFormat->getCertificateChain();
+    }
+
+    /**
+     * return the certificate issuer as string
+     * @return string
+     */
+    public function getCertificateIssuer() {
+        $pem = $this->getCertificatePem();
+        $issuer = '';
+        if ($pem) {
+            $certInfo = \openssl_x509_parse($pem);
+            if (\is_array($certInfo) && \array_key_exists('issuer', $certInfo) && \is_array($certInfo['issuer'])) {
+
+                $cn = $certInfo['issuer']['CN'] ?? '';
+                $o = $certInfo['issuer']['O'] ?? '';
+                $ou = $certInfo['issuer']['OU'] ?? '';
+
+                if ($cn) {
+                    $issuer .= $cn;
+                }
+                if ($issuer && ($o || $ou)) {
+                    $issuer .= ' (' . trim($o . ' ' . $ou) . ')';
+                } else {
+                    $issuer .= trim($o . ' ' . $ou);
+                }
+            }
+        }
+
+        return $issuer;
+    }
+
+    /**
+     * return the certificate subject as string
+     * @return string
+     */
+    public function getCertificateSubject() {
+        $pem = $this->getCertificatePem();
+        $subject = '';
+        if ($pem) {
+            $certInfo = \openssl_x509_parse($pem);
+            if (\is_array($certInfo) && \array_key_exists('subject', $certInfo) && \is_array($certInfo['subject'])) {
+
+                $cn = $certInfo['subject']['CN'] ?? '';
+                $o = $certInfo['subject']['O'] ?? '';
+                $ou = $certInfo['subject']['OU'] ?? '';
+
+                if ($cn) {
+                    $subject .= $cn;
+                }
+                if ($subject && ($o || $ou)) {
+                    $subject .= ' (' . trim($o . ' ' . $ou) . ')';
+                } else {
+                    $subject .= trim($o . ' ' . $ou);
+                }
+            }
+        }
+
+        return $subject;
+    }
+
+    /**
+     * returns the key certificate in PEM format
+     * @return string
+     */
+    public function getCertificatePem() {
+        return $this->_attestationFormat->getCertificatePem();
+    }
+
+    /**
+     * checks validity of the signature
+     * @param string $clientDataHash
+     * @return bool
+     * @throws WebAuthnException
+     */
+    public function validateAttestation($clientDataHash) {
+        return $this->_attestationFormat->validateAttestation($clientDataHash);
+    }
+
+    /**
+     * validates the certificate against root certificates
+     * @param array $rootCas
+     * @return boolean
+     * @throws WebAuthnException
+     */
+    public function validateRootCertificate($rootCas) {
+        return $this->_attestationFormat->validateRootCertificate($rootCas);
+    }
+
+    /**
+     * checks if the RpId-Hash is valid
+     * @param string$rpIdHash
+     * @return bool
+     */
+    public function validateRpIdHash($rpIdHash) {
+        return $rpIdHash === $this->_authenticatorData->getRpIdHash();
+    }
+}