Hi,
I've got a problem using iText to digitally sign a PDF. The Groovy script
below works fine with a test PDF I created in Acrobat Pro 7.0. But when I
run it on a PDF produced by my production document system (Oracle
Documaker), I get this exception:
java.lang.ArrayIndexOutOfBoundsException: 2
at
com.itextpdf.text.pdf.PdfEncryption.createInfoId(PdfEncryption.java:401)
I'm using iText 5.0.2, JDK 1.6, and Groovy 1.5.6.
Both PDFs are encrypted before my script begins - with printing and
signing allowed, but changing of the document prohibited. The Acrobat 7
PDF is PDF Version 1.6; the Documaker PDF is PDF Version 1.4. Both are
encrypted with 128-bit RC4. I don't know where to look for any other
material differences between the two files.
Does anyone have any thoughts on why iText throws an exception when trying
to sign the Documaker-generated PDFs?
import java.security.KeyStore
import java.security.PrivateKey
import java.security.cert.Certificate
import com.itextpdf.text.pdf.PdfReader
import com.itextpdf.text.pdf.PdfStamper
import com.itextpdf.text.pdf.PdfWriter
import com.itextpdf.text.pdf.PdfSignatureAppearance
import com.itextpdf.text.pdf.PdfName
import com.itextpdf.text.Image
import com.itextpdf.text.Rectangle
static String sign(
String keyFile,
String keyFilePassword,
String inFile,
String ownerPassword,
String reason,
String location,
String signer,
String sigFieldName,
String outFile
) {
try {
KeyStore ks = KeyStore.getInstance("pkcs12")
ks.load(new FileInputStream(keyFile),
keyFilePassword.toCharArray())
String alias = (String)ks.aliases().nextElement()
PrivateKey key = (PrivateKey)ks.getKey(alias,
keyFilePassword.toCharArray())
Certificate[] chain = ks.getCertificateChain(alias)
PdfReader reader = new PdfReader(inFile,
ownerPassword.getBytes())
FileOutputStream fout = new FileOutputStream(outFile)
// Groovy thinks '\0' is a GString, so we have to be
explicit and force it to char.
PdfStamper stp = PdfStamper.createSignature(reader, fout,
'\0'.toCharacter().charValue(), null, true)
stp.getWriter().setPdfVersion(PdfWriter.PDF_VERSION_1_6)
PdfSignatureAppearance sap = stp.getSignatureAppearance()
sap.setCrypto(key, chain, null,
PdfSignatureAppearance.WINCER_SIGNED)
sap.setReason(reason)
sap.setLocation(location)
sap.setLayer2Text(signer)
sap.setVisibleSignature(sigFieldName)
stp.close()
return outFile
} catch (Throwable t) {
println t
}
}
String outfile = sign(
"C:/certs/eAppTest_20110429.pfx",
[redacted],
"C:/certs/72567C71-D0AD-ADAB-E6EE-D464F714650C-0-IDS-1-BLP.PDF",
[redacted],
"reason",
"location",
"Foo Bar",
"insuredSignature",
"C:/certs/72567C71-D0AD-ADAB-E6EE-D464F714650C-0-IDS-1-BLP-signed.PDF"
)
println "Signed ${outfile}"
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