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<?php |
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namespace MadWizard\WebAuthn\Attestation\Tpm; |
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use MadWizard\WebAuthn\Exception\ParseException; |
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use MadWizard\WebAuthn\Exception\UnsupportedException; |
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use MadWizard\WebAuthn\Format\ByteBuffer; |
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/** |
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* Represents TPMT_PUBLIC structure. |
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*/ |
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final class TpmPublic |
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{ |
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use TpmStructureTrait; |
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public const TPM_ALG_RSA = 0x0001; |
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public const TPM_ALG_ECC = 0x0023; |
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public const TPM_ALG_NULL = 0x0010; |
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public const TPM_ALG_SHA = 0x0004; // ISO/IEC 10118-3 the SHA1 algorithm |
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public const TPM_ALG_SHA1 = 0x0004; // ISO/IEC 10118-3 redefinition for documentation consistency TPM |
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public const TPM_ALG_SHA256 = 0x000B; // ISO/IEC 10118-3 the SHA 256 algorithm |
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public const TPM_ALG_SHA384 = 0x000C; // ISO/IEC 10118-3 the SHA 384 algorithm |
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public const TPM_ALG_SHA512 = 0x000D; // ISO/IEC 10118-3 the SHA 512 algorithm |
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private const PHP_HASH_ALG_MAP = [ |
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self::TPM_ALG_SHA1 => 'sha1', |
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self::TPM_ALG_SHA256 => 'sha256', |
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self::TPM_ALG_SHA384 => 'sha384', |
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self::TPM_ALG_SHA512 => 'sha512', |
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]; |
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/** |
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* @var int |
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*/ |
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private $type; |
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/** |
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* @var int |
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*/ |
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private $objectAttributes; |
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/** |
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* @var int |
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*/ |
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private $nameAlg; |
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/** |
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* @var string |
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*/ |
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private $rawData; |
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/** |
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* @var KeyParametersInterface |
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*/ |
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private $parameters; |
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/** |
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* @var KeyPublicIdInterface |
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*/ |
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private $unique; |
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public function __construct(ByteBuffer $data) |
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{ |
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$this->rawData = $data->getBinaryString(); |
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$this->type = $data->getUint16Val(0); |
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$this->nameAlg = $data->getUint16Val(2); |
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$this->objectAttributes = $data->getUint32Val(4); |
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$offset = 8; |
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// Auth policy |
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self::readLengthPrefixed($data, $offset); |
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$this->parameters = $this->parseParameters($this->type, $data, $offset); |
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$this->unique = $this->parseUnique($this->type, $data, $offset); |
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if ($offset !== $data->getLength()) { |
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throw new ParseException('Unexpected bytes after TPMT_PUBLIC structure.'); |
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} |
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} |
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private function parseParameters(int $type, ByteBuffer $buffer, int &$offset): KeyParametersInterface |
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{ |
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if ($type === self::TPM_ALG_RSA) { |
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$parameters = TpmRsaParameters::parse($buffer, $offset, $endOffset); |
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$offset = $endOffset; |
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return $parameters; |
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} |
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if ($type === self::TPM_ALG_ECC) { |
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$parameters = TpmEccParameters::parse($buffer, $offset, $endOffset); |
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$offset = $endOffset; |
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return $parameters; |
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} |
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throw new UnsupportedException(sprintf('TPM public key type %d is not supported.', $type)); |
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} |
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private function parseUnique(int $type, ByteBuffer $buffer, int &$offset): KeyPublicIdInterface |
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{ |
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if ($type === self::TPM_ALG_RSA) { |
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$unique = TpmRsaPublicId::parse($buffer, $offset, $endOffset); |
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$offset = $endOffset; |
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return $unique; |
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} |
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if ($type === self::TPM_ALG_ECC) { |
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$unique = TpmEccPublicId::parse($buffer, $offset, $endOffset); |
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$offset = $endOffset; |
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return $unique; |
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} |
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throw new UnsupportedException(sprintf('TPM public key type %d is not supported.', $type)); |
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} |
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public function getType(): int |
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{ |
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return $this->type; |
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} |
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public function getObjectAttributes(): int |
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{ |
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return $this->objectAttributes; |
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} |
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public function getParameters(): KeyParametersInterface |
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{ |
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return $this->parameters; |
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} |
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public function getNameAlg(): int |
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{ |
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return $this->nameAlg; |
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} |
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public function getUnique(): KeyPublicIdInterface |
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{ |
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return $this->unique; |
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} |
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public function isValidPubInfoName(ByteBuffer $name): bool |
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{ |
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// TPM names are prefixed by a 16-bit integer representing the hashing algorithm |
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$algo = $name->getUint16Val(0); |
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// The name itself is a concatenation of the algorithm and a hash of this whole structure. |
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$phpAlgo = self::PHP_HASH_ALG_MAP[$algo] ?? null; |
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if ($phpAlgo === null) { |
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throw new UnsupportedException(sprintf('Algorithm 0x%04X is not allowed for names for TPMT_PUBLIC.', $algo)); |
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} |
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$validName = pack('n', $algo) . hash($phpAlgo, $this->rawData, true); |
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return \hash_equals($validName, $name->getBinaryString()); |
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} |
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} |
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madwizard-org /
webauthn-server
