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Perl Examples

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(Perl) Encrypt File in Chunks using AES CBC

Demonstrates how to use the FirstChunk/LastChunk properties to encrypt a file chunk-by-chunk.

Important This example requires Chilkat v9.5.0.68 or later.

Chilkat Perl Downloads

Perl Module for Windows, Linux, Alpine Linux,
MAC OS X, Solaris, FreeBSD, OpenBSD,
Raspberry Pi and other single board computers

use chilkat();

# This example requires the Chilkat Crypt API to have been previously unlocked.
# See Unlock Chilkat Crypt for sample code.

$crypt = chilkat::CkCrypt2->new();

$crypt->put_CryptAlgorithm("aes");
$crypt->put_CipherMode("cbc");
$crypt->put_KeyLength(128);

$crypt->SetEncodedKey("000102030405060708090A0B0C0D0E0F","hex");
$crypt->SetEncodedIV("000102030405060708090A0B0C0D0E0F","hex");

$fileToEncrypt = "qa_data/hamlet.xml";
$facIn = chilkat::CkFileAccess->new();
$success = $facIn->OpenForRead($fileToEncrypt);
if ($success != 1) {
    print "Failed to open file that is to be encrytped." . "\r\n";
    exit;
}

$outputEncryptedFile = "qa_output/hamlet.enc";
$facOutEnc = chilkat::CkFileAccess->new();
$success = $facOutEnc->OpenForWrite($outputEncryptedFile);
if ($success != 1) {
    print "Failed to encrypted output file." . "\r\n";
    exit;
}

# Let's encrypt in 10000 byte chunks.
$chunkSize = 10000;
$numChunks = $facIn->GetNumBlocks($chunkSize);

$crypt->put_FirstChunk(1);
$crypt->put_LastChunk(0);

$bd = chilkat::CkBinData->new();

$i = 0;
while ($i < $numChunks) {
    $i = $i + 1;
    if ($i == $numChunks) {
        $crypt->put_LastChunk(1);
    }

    # Read the next chunk from the file.
    # The last chunk will be whatever amount remains in the file..
    $bd->Clear();
    $facIn->FileReadBd($chunkSize,$bd);

    # Encrypt.
    $crypt->EncryptBd($bd);

    # Write the encrypted chunk to the output file.
    $facOutEnc->FileWriteBd($bd,0,0);

    $crypt->put_FirstChunk(0);
}

# Make sure both FirstChunk and LastChunk are restored to 1 after
# encrypting or decrypting in chunks.  Otherwise subsequent encryptions/decryptions
# will produce unexpected results.
$crypt->put_FirstChunk(1);
$crypt->put_LastChunk(1);

$facIn->FileClose();
$facOutEnc->FileClose();

# Decrypt the encrypted output file in a single call using CBC mode:
$decryptedFile = "qa_output/hamlet_dec.xml";
$success = $crypt->CkDecryptFile($outputEncryptedFile,$decryptedFile);
# Assume success for the example..

# Compare the contents of the decrypted file with the original file:
$bSame = $facIn->FileContentsEqual($fileToEncrypt,$decryptedFile);
print "bSame = " . $bSame . "\r\n";

 

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