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(PHP Extension) How to Tell if a File is .p7m or .p7sThis example explains how to detect if a file is a .p7m or .p7s. It provides as solution to the following problem:
Sometimes people submit P7S/P7M with wrong extensions. Can I check if file is P7S or P7M with Chilkat? Also see What is a P7M or P7S File?
<?php include("chilkat.php"); // Use "chilkat_9_5_0.php" for versions of Chilkat < 10.0.0 // A .p7m or .p7s file is binary and contains PKCS7. // PKCS7 is ASN.1, and always begins with a SEQUENCE tag (a byte equal to 0x30) // followed by an encoded length. // If the file is larger than 128 bytes (and it SHOULD be), the encoded length will begin with either 0x80, 0x81, 0x82, or 0x83. // It can also begin with 0x84, but only for very large files (where the length is too large for 3 bytes). // See How ASN.1 Encodes Lengths // Therefore, if we have a file that might be .p7m or .p7s, we can check by // examining the 1st 2 bytes of the file. $bd = new CkBinData(); $success = $bd->LoadFile('qa_data/p7m/a.p7m'); if ($success == false) { print 'Failed to load the file.' . "\n"; exit; } $sb = new CkStringBuilder(); $sb->Append($bd->getEncodedChunk(0,2,'hex')); $caseSensitive = true; if ($sb->ContentsEqual('3080',$caseSensitive) or $sb->ContentsEqual('3081',$caseSensitive) or $sb->ContentsEqual('3082',$caseSensitive) or $sb->ContentsEqual('3083',$caseSensitive)) { print 'This is a .p7m or .p7s file.' . "\n"; } else { print 'This is not a .p7m or .p7s file.' . "\n"; } ?> |
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