Class PdfSigner
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Nested Class Summary
Nested ClassesModifier and TypeClassDescriptionstatic enum
Enum containing the Cryptographic Standards.(package private) static interface
static interface
An interface to retrieve the signature dictionary for modification.private static class
(package private) static class
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Field Summary
FieldsModifier and TypeFieldDescriptionprivate final PdfAcroForm
AcroForm for the PdfDocument.protected byte[]
The bytes of the file right before the signature is added (if raf is null).protected boolean
Boolean to check if this PdfSigner instance has been closed already or not.protected PdfSignature
The crypto dictionary.protected PdfDocument
The PdfDocument.protected Map
<PdfName, PdfLiteral> Name and content of keys that can only be added in the close() method.private static final IBouncyCastleFactory
private static final String
(package private) static final int
protected OutputStream
OutputStream for the bytes of the document.protected boolean
Indicates if the pdf document has already been pre-closed.protected RandomAccessFile
The file right before the signature is added (can be null).protected long[]
Array containing the byte positions of the bytes that need to be hashed.protected PdfSigner.ISignatureEvent
Holds value of property signatureEvent.private String
The name of the signer extracted from the signing certificate.private SignerProperties
Properties to be used in signing operations.protected File
Tempfile to hold the output temporarily.protected ByteArrayOutputStream
Outputstream that temporarily holds the output in memory. -
Constructor Summary
ConstructorsConstructorDescriptionPdfSigner
(PdfDocument document, OutputStream outputStream, ByteArrayOutputStream temporaryOS, File tempFile) PdfSigner
(PdfReader reader, OutputStream outputStream, StampingProperties properties) Creates a PdfSigner instance.PdfSigner
(PdfReader reader, OutputStream outputStream, String path, StampingProperties properties) Creates a PdfSigner instance.PdfSigner
(PdfReader reader, OutputStream outputStream, String path, StampingProperties stampingProperties, SignerProperties signerProperties) Creates a PdfSigner instance. -
Method Summary
Modifier and TypeMethodDescriptionprotected void
addDeveloperExtension
(PdfDeveloperExtension extension) Add developer extension to the currentPdfDocument
.protected void
addDocMDP
(PdfSignature crypto) Adds keys to the signature dictionary that define the certification level and the permissions.protected void
addFieldMDP
(PdfSignature crypto, PdfSigFieldLock fieldLock) Adds keys to the signature dictionary that define the field permissions.protected void
applyAccessibilityProperties
(PdfFormField formField, IAccessibleElement modelElement, PdfDocument pdfDocument) private void
protected void
close
(PdfDictionary update) This is the last method to be called when using external signatures.protected PdfSigFieldLock
createNewSignatureFormField
(PdfAcroForm acroForm, String name) Creates new signature form field and adds it to the acroForm object.(package private) PdfSignature
createSignatureDictionary
(boolean includeDate) protected boolean
Check if current document instance already contains certification or approval signatures.private byte[]
embedMacTokenIntoSignatureContainer
(byte[] signatureContainer) private void
fillInAppearanceText
(SignedAppearanceText appearanceText) private SignedAppearanceText
Gets the PdfDocument associated with this instance.private String
Gets a new signature field name that doesn't clash with any existing name.protected InputStream
Gets the document bytes that are hashable when using external signatures.protected SignatureFieldAppearance
Returns final signature appearance object set bySignerProperties.setSignatureAppearance(SignatureFieldAppearance)
and customized usingPdfSigner
properties such as signing date, reason, location and signer name in case they weren't specified by the user, or, if none was set, returns a new one with default appearance.Returns the user made signature dictionary.Getter for property signatureEvent.Gets the signature field to be signed.private static String
getSignerName
(X509Certificate certificate) Gets the properties to be used in signing operations.protected IRandomAccessSource
Returns the underlying source.protected int
Get the page number associated to the provided widget.protected Rectangle
Get the rectangle associated to the provided widget.protected PdfDocument
initDocument
(PdfReader reader, PdfWriter writer, StampingProperties properties) Initialize newPdfDocument
instance by using provided parameters.private boolean
protected boolean
Checks if the document is in the process of closing.private void
protected PdfSigFieldLock
Populates already existing signature form field in the acroForm object.protected void
This is the first method to be called when using external signatures.protected Collection
<byte[]> processCrl
(Certificate cert, Collection<ICrlClient> crlList) Processes a CRL list.private void
protected void
setDocument
(PdfDocument document) Sets the PdfDocument.void
setOriginalOutputStream
(OutputStream originalOS) Setter for the OutputStream.void
setSignatureEvent
(PdfSigner.ISignatureEvent signatureEvent) Sets the signature event to allow modification of the signature dictionary.setSignerProperties
(SignerProperties properties) Sets the properties to be used in signing operations.static void
signDeferred
(PdfDocument document, String fieldName, OutputStream outs, IExternalSignatureContainer externalSignatureContainer) Signs a PDF where space was already reserved.void
signDetached
(IExternalDigest externalDigest, IExternalSignature externalSignature, Certificate[] chain, Collection<ICrlClient> crlList, IOcspClient ocspClient, ITSAClient tsaClient, int estimatedSize, PdfSigner.CryptoStandard sigtype) Signs the document using the detached mode, CMS or CAdES equivalent.void
signDetached
(IExternalDigest externalDigest, IExternalSignature externalSignature, Certificate[] chain, Collection<ICrlClient> crlList, IOcspClient ocspClient, ITSAClient tsaClient, int estimatedSize, PdfSigner.CryptoStandard sigtype, ISignaturePolicyIdentifier signaturePolicy) Signs the document using the detached mode, CMS or CAdES equivalent.void
signDetached
(IExternalDigest externalDigest, IExternalSignature externalSignature, Certificate[] chain, Collection<ICrlClient> crlList, IOcspClient ocspClient, ITSAClient tsaClient, int estimatedSize, PdfSigner.CryptoStandard sigtype, SignaturePolicyInfo signaturePolicy) Signs the document using the detached mode, CMS or CAdES equivalent.void
signDetached
(IExternalSignature externalSignature, Certificate[] chain, Collection<ICrlClient> crlList, IOcspClient ocspClient, ITSAClient tsaClient, int estimatedSize, PdfSigner.CryptoStandard sigtype) Signs the document using the detached mode, CMS or CAdES equivalent.void
signDetached
(IExternalSignature externalSignature, Certificate[] chain, Collection<ICrlClient> crlList, IOcspClient ocspClient, ITSAClient tsaClient, int estimatedSize, PdfSigner.CryptoStandard sigtype, ISignaturePolicyIdentifier signaturePolicy) Signs the document using the detached mode, CMS or CAdES equivalent.void
signDetached
(IExternalSignature externalSignature, Certificate[] chain, Collection<ICrlClient> crlList, IOcspClient ocspClient, ITSAClient tsaClient, int estimatedSize, PdfSigner.CryptoStandard sigtype, SignaturePolicyInfo signaturePolicy) Signs the document using the detached mode, CMS or CAdES equivalent.void
signExternalContainer
(IExternalSignatureContainer externalSignatureContainer, int estimatedSize) Sign the document using an external container, usually a PKCS7.void
timestamp
(ITSAClient tsa, String signatureName) Signs a document with a PAdES-LTV Timestamp.private void
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Field Details
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MAXIMUM_MAC_SIZE
static final int MAXIMUM_MAC_SIZE- See Also:
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FACTORY
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ID_ATTR_PDF_MAC_DATA
- See Also:
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raf
The file right before the signature is added (can be null). -
bout
protected byte[] boutThe bytes of the file right before the signature is added (if raf is null). -
range
protected long[] rangeArray containing the byte positions of the bytes that need to be hashed. -
document
The PdfDocument. -
cryptoDictionary
The crypto dictionary. -
signatureEvent
Holds value of property signatureEvent. -
originalOS
OutputStream for the bytes of the document. -
temporaryOS
Outputstream that temporarily holds the output in memory. -
tempFile
Tempfile to hold the output temporarily. -
exclusionLocations
Name and content of keys that can only be added in the close() method. -
preClosed
protected boolean preClosedIndicates if the pdf document has already been pre-closed. -
closed
protected boolean closedBoolean to check if this PdfSigner instance has been closed already or not. -
acroForm
AcroForm for the PdfDocument. -
signerName
The name of the signer extracted from the signing certificate. -
signerProperties
Properties to be used in signing operations.
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Constructor Details
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PdfSigner
public PdfSigner(PdfReader reader, OutputStream outputStream, StampingProperties properties) throws IOException Creates a PdfSigner instance. Uses aByteArrayOutputStream
instead of a temporary file.- Parameters:
reader
- PdfReader that reads the PDF fileoutputStream
- OutputStream to write the signed PDF fileproperties
-StampingProperties
for the signing document. Note that encryption will be preserved regardless of what is set in properties.- Throws:
IOException
- if some I/O problem occurs
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PdfSigner
public PdfSigner(PdfReader reader, OutputStream outputStream, String path, StampingProperties stampingProperties, SignerProperties signerProperties) throws IOException Creates a PdfSigner instance. Uses aByteArrayOutputStream
instead of a temporary file.- Parameters:
reader
- PdfReader that reads the PDF fileoutputStream
- OutputStream to write the signed PDF filepath
- File to which the output is temporarily writtenstampingProperties
-StampingProperties
for the signing document. Note that encryption will be preserved regardless of what is set in properties.signerProperties
-SignerProperties
bundled properties to be used in signing operations.- Throws:
IOException
- if some I/O problem occurs
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PdfSigner
public PdfSigner(PdfReader reader, OutputStream outputStream, String path, StampingProperties properties) throws IOException Creates a PdfSigner instance. Uses aByteArrayOutputStream
instead of a temporary file.- Parameters:
reader
- PdfReader that reads the PDF fileoutputStream
- OutputStream to write the signed PDF filepath
- File to which the output is temporarily writtenproperties
-StampingProperties
for the signing document. Note that encryption will be preserved regardless of what is set in properties.- Throws:
IOException
- if some I/O problem occurs
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PdfSigner
PdfSigner(PdfDocument document, OutputStream outputStream, ByteArrayOutputStream temporaryOS, File tempFile)
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Method Details
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initDocument
protected PdfDocument initDocument(PdfReader reader, PdfWriter writer, StampingProperties properties) Initialize newPdfDocument
instance by using provided parameters.- Parameters:
reader
-PdfReader
to be used as a reader in the new documentwriter
-PdfWriter
to be used as a writer in the new documentproperties
-StampingProperties
to be provided in the new document- Returns:
- new
PdfDocument
instance
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setSignerProperties
Sets the properties to be used in signing operations.- Parameters:
properties
- the signer properties- Returns:
- this instance to support fluent interface
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getSignerProperties
Gets the properties to be used in signing operations.- Returns:
- the signer properties
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getSignatureDictionary
Returns the user made signature dictionary. This is the dictionary at the /V key of the signature field.- Returns:
- the user made signature dictionary
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getSignatureEvent
Getter for property signatureEvent.- Returns:
- value of property signatureEvent
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setSignatureEvent
Sets the signature event to allow modification of the signature dictionary.- Parameters:
signatureEvent
- the signature event
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getNewSigFieldName
Gets a new signature field name that doesn't clash with any existing name.- Returns:
- A new signature field name.
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getDocument
Gets the PdfDocument associated with this instance.- Returns:
- the PdfDocument associated with this instance
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setDocument
Sets the PdfDocument.- Parameters:
document
- The PdfDocument
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setOriginalOutputStream
Setter for the OutputStream.- Parameters:
originalOS
- OutputStream for the bytes of the document
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getSignatureField
Gets the signature field to be signed. The field can already be presented in the document. If the field is not presented in the document, it will be created.This field instance is expected to be used for setting appearance related properties such as
PdfSignatureFormField.setReuseAppearance(boolean)
,PdfSignatureFormField.setBackgroundLayer(com.itextpdf.kernel.pdf.xobject.PdfFormXObject)
andPdfSignatureFormField.setSignatureAppearanceLayer(com.itextpdf.kernel.pdf.xobject.PdfFormXObject)
.Note that for the new signature field
SignerProperties.setPageRect(Rectangle)
andSignerProperties.setPageNumber(int)
should be called before this method.- Returns:
- the
PdfSignatureFormField
instance
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signDetached
public void signDetached(IExternalDigest externalDigest, IExternalSignature externalSignature, Certificate[] chain, Collection<ICrlClient> crlList, IOcspClient ocspClient, ITSAClient tsaClient, int estimatedSize, PdfSigner.CryptoStandard sigtype) throws IOException, GeneralSecurityException Signs the document using the detached mode, CMS or CAdES equivalent.
NOTE: This method closes the underlying pdf document. This means, that current instance of PdfSigner cannot be used after this method call.- Parameters:
externalDigest
- an implementation that provides the digestexternalSignature
- the interface providing the actual signingchain
- the certificate chaincrlList
- the CRL listocspClient
- the OCSP clienttsaClient
- the Timestamp clientestimatedSize
- the reserved size for the signature. It will be estimated if 0sigtype
- Either Signature.CMS or Signature.CADES- Throws:
IOException
- if some I/O problem occursGeneralSecurityException
- if some problem during apply security algorithms occurs
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signDetached
public void signDetached(IExternalSignature externalSignature, Certificate[] chain, Collection<ICrlClient> crlList, IOcspClient ocspClient, ITSAClient tsaClient, int estimatedSize, PdfSigner.CryptoStandard sigtype) throws IOException, GeneralSecurityException Signs the document using the detached mode, CMS or CAdES equivalent.
NOTE: This method closes the underlying pdf document. This means, that current instance of PdfSigner cannot be used after this method call.- Parameters:
externalSignature
- the interface providing the actual signingchain
- the certificate chaincrlList
- the CRL listocspClient
- the OCSP clienttsaClient
- the Timestamp clientestimatedSize
- the reserved size for the signature. It will be estimated if 0sigtype
- Either Signature.CMS or Signature.CADES- Throws:
IOException
- if some I/O problem occursGeneralSecurityException
- if some problem during apply security algorithms occurs
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signDetached
public void signDetached(IExternalDigest externalDigest, IExternalSignature externalSignature, Certificate[] chain, Collection<ICrlClient> crlList, IOcspClient ocspClient, ITSAClient tsaClient, int estimatedSize, PdfSigner.CryptoStandard sigtype, SignaturePolicyInfo signaturePolicy) throws IOException, GeneralSecurityException Signs the document using the detached mode, CMS or CAdES equivalent.
NOTE: This method closes the underlying pdf document. This means, that current instance of PdfSigner cannot be used after this method call.- Parameters:
externalDigest
- an implementation that provides the digestexternalSignature
- the interface providing the actual signingchain
- the certificate chaincrlList
- the CRL listocspClient
- the OCSP clienttsaClient
- the Timestamp clientestimatedSize
- the reserved size for the signature. It will be estimated if 0sigtype
- Either Signature.CMS or Signature.CADESsignaturePolicy
- the signature policy (for EPES signatures)- Throws:
IOException
- if some I/O problem occursGeneralSecurityException
- if some problem during apply security algorithms occurs
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signDetached
public void signDetached(IExternalSignature externalSignature, Certificate[] chain, Collection<ICrlClient> crlList, IOcspClient ocspClient, ITSAClient tsaClient, int estimatedSize, PdfSigner.CryptoStandard sigtype, SignaturePolicyInfo signaturePolicy) throws IOException, GeneralSecurityException Signs the document using the detached mode, CMS or CAdES equivalent.
NOTE: This method closes the underlying pdf document. This means, that current instance of PdfSigner cannot be used after this method call.- Parameters:
externalSignature
- the interface providing the actual signingchain
- the certificate chaincrlList
- the CRL listocspClient
- the OCSP clienttsaClient
- the Timestamp clientestimatedSize
- the reserved size for the signature. It will be estimated if 0sigtype
- Either Signature.CMS or Signature.CADESsignaturePolicy
- the signature policy (for EPES signatures)- Throws:
IOException
- if some I/O problem occursGeneralSecurityException
- if some problem during apply security algorithms occurs
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signDetached
public void signDetached(IExternalSignature externalSignature, Certificate[] chain, Collection<ICrlClient> crlList, IOcspClient ocspClient, ITSAClient tsaClient, int estimatedSize, PdfSigner.CryptoStandard sigtype, ISignaturePolicyIdentifier signaturePolicy) throws IOException, GeneralSecurityException Signs the document using the detached mode, CMS or CAdES equivalent.
NOTE: This method closes the underlying pdf document. This means, that current instance of PdfSigner cannot be used after this method call.- Parameters:
externalSignature
- the interface providing the actual signingchain
- the certificate chaincrlList
- the CRL listocspClient
- the OCSP clienttsaClient
- the Timestamp clientestimatedSize
- the reserved size for the signature. It will be estimated if 0sigtype
- Either Signature.CMS or Signature.CADESsignaturePolicy
- the signature policy (for EPES signatures)- Throws:
IOException
- if some I/O problem occursGeneralSecurityException
- if some problem during apply security algorithms occurs
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signDetached
public void signDetached(IExternalDigest externalDigest, IExternalSignature externalSignature, Certificate[] chain, Collection<ICrlClient> crlList, IOcspClient ocspClient, ITSAClient tsaClient, int estimatedSize, PdfSigner.CryptoStandard sigtype, ISignaturePolicyIdentifier signaturePolicy) throws IOException, GeneralSecurityException Signs the document using the detached mode, CMS or CAdES equivalent.
NOTE: This method closes the underlying pdf document. This means, that current instance of PdfSigner cannot be used after this method call.- Parameters:
externalDigest
- an implementation that provides the digestexternalSignature
- the interface providing the actual signingchain
- the certificate chaincrlList
- the CRL listocspClient
- the OCSP clienttsaClient
- the Timestamp clientestimatedSize
- the reserved size for the signature. It will be estimated if 0sigtype
- Either Signature.CMS or Signature.CADESsignaturePolicy
- the signature policy (for EPES signatures)- Throws:
IOException
- if some I/O problem occursGeneralSecurityException
- if some problem during apply security algorithms occurs
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signExternalContainer
public void signExternalContainer(IExternalSignatureContainer externalSignatureContainer, int estimatedSize) throws GeneralSecurityException, IOException Sign the document using an external container, usually a PKCS7. The signature is fully composed externally, iText will just put the container inside the document.
NOTE: This method closes the underlying pdf document. This means, that current instance of PdfSigner cannot be used after this method call.- Parameters:
externalSignatureContainer
- the interface providing the actual signingestimatedSize
- the reserved size for the signature- Throws:
GeneralSecurityException
- if some problem during apply security algorithms occursIOException
- if some I/O problem occurs
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timestamp
public void timestamp(ITSAClient tsa, String signatureName) throws IOException, GeneralSecurityException Signs a document with a PAdES-LTV Timestamp. The document is closed at the end.
NOTE: This method closes the underlying pdf document. This means, that current instance of PdfSigner cannot be used after this method call.- Parameters:
tsa
- the timestamp generatorsignatureName
- the signature name or null to have a name generated automatically- Throws:
IOException
- if some I/O problem occurs or estimation for timestamp signature, provided withITSAClient.getTokenSizeEstimate()
, is not big enoughGeneralSecurityException
- if some problem during apply security algorithms occurs
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signDeferred
public static void signDeferred(PdfDocument document, String fieldName, OutputStream outs, IExternalSignatureContainer externalSignatureContainer) throws IOException, GeneralSecurityException Signs a PDF where space was already reserved.- Parameters:
document
- the original PDFfieldName
- the field to sign. It must be the last fieldouts
- the output PDFexternalSignatureContainer
- the signature container doing the actual signing. Only the method ExternalSignatureContainer.sign is used- Throws:
IOException
- if some I/O problem occursGeneralSecurityException
- if some problem during apply security algorithms occurs
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processCrl
protected Collection<byte[]> processCrl(Certificate cert, Collection<ICrlClient> crlList) throws CertificateEncodingException Processes a CRL list.- Parameters:
cert
- a Certificate if one of the CrlList implementations needs to retrieve the CRL URL from it.crlList
- a list of CrlClient implementations- Returns:
- a collection of CRL bytes that can be embedded in a PDF
- Throws:
CertificateEncodingException
- if an encoding error occurs inCertificate
.
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addDeveloperExtension
Add developer extension to the currentPdfDocument
.- Parameters:
extension
-PdfDeveloperExtension
to be added
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isPreClosed
protected boolean isPreClosed()Checks if the document is in the process of closing.- Returns:
- true if the document is in the process of closing, false otherwise
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preClose
This is the first method to be called when using external signatures. The general sequence is: preClose(), getDocumentBytes() and close().exclusionSizes
must contain at least thePdfName.CONTENTS
key with the size that it will take in the document. Note that due to the hex string coding this size should be byte_size*2+2.- Parameters:
exclusionSizes
- Map with names and sizes to be excluded in the signature calculation. The key is a PdfName and the value an Integer. At least the /Contents must be present- Throws:
IOException
- on error
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getSignatureAppearance
Returns final signature appearance object set bySignerProperties.setSignatureAppearance(SignatureFieldAppearance)
and customized usingPdfSigner
properties such as signing date, reason, location and signer name in case they weren't specified by the user, or, if none was set, returns a new one with default appearance.To customize the appearance of the signature, create new
SignatureFieldAppearance
object and set it usingSignerProperties.setSignatureAppearance(SignatureFieldAppearance)
.Note that in case you create new signature field (either use
SignerProperties.setFieldName(java.lang.String)
with the name that doesn't exist in the document or don't specify it at all) then the signature is invisible by default.It is possible to set other appearance related properties such as
PdfSignatureFormField.setReuseAppearance(boolean)
,PdfSignatureFormField.setBackgroundLayer(com.itextpdf.kernel.pdf.xobject.PdfFormXObject)
(n0 layer) andPdfSignatureFormField.setSignatureAppearanceLayer(com.itextpdf.kernel.pdf.xobject.PdfFormXObject)
(n2 layer) for the signature field usinggetSignatureField()
. Page, rectangle and other properties could be set up viaSignerProperties
.- Returns:
SignatureFieldAppearance
object representing signature appearance
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populateExistingSignatureFormField
Populates already existing signature form field in the acroForm object. This method is called during thepreClose(Map)
method if the signature field already exists.- Parameters:
acroForm
-PdfAcroForm
object in which the signature field will be populated- Returns:
- signature field lock dictionary
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createNewSignatureFormField
Creates new signature form field and adds it to the acroForm object. This method is called during thepreClose(Map)
method if the signature field doesn't exist.- Parameters:
acroForm
-PdfAcroForm
object in which new signature field will be addedname
- the name of the field- Returns:
- signature field lock dictionary
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getRangeStream
Gets the document bytes that are hashable when using external signatures. The general sequence is:preClose(Map)
,getRangeStream()
andclose(PdfDictionary)
.- Returns:
- the
InputStream
of bytes to be signed - Throws:
IOException
- if some I/O problem occurs
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close
This is the last method to be called when using external signatures. The general sequence is: preClose(), getDocumentBytes() and close().update is a PdfDictionary that must have exactly the same keys as the ones provided in
preClose(Map)
.- Parameters:
update
- a PdfDictionary with the key/value that will fill the holes defined inpreClose(Map)
- Throws:
IOException
- on error
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getUnderlyingSource
Returns the underlying source.- Returns:
- the underlying source
- Throws:
IOException
- if some I/O problem occurs
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addDocMDP
Adds keys to the signature dictionary that define the certification level and the permissions. This method is only used for Certifying signatures.- Parameters:
crypto
- the signature dictionary
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addFieldMDP
Adds keys to the signature dictionary that define the field permissions. This method is only used for signatures that lock fields.- Parameters:
crypto
- the signature dictionaryfieldLock
- thePdfSigFieldLock
instance specified the field lock to be set
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documentContainsCertificationOrApprovalSignatures
protected boolean documentContainsCertificationOrApprovalSignatures()Check if current document instance already contains certification or approval signatures.- Returns:
true
if document contains certification or approval signatures,false
otherwise
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getWidgetRectangle
Get the rectangle associated to the provided widget.- Parameters:
widget
- PdfWidgetAnnotation to extract the rectangle from- Returns:
- Rectangle
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getWidgetPageNumber
Get the page number associated to the provided widget.- Parameters:
widget
- PdfWidgetAnnotation from which to extract the page number- Returns:
- page number
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createSignatureDictionary
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getSignerName
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updateFieldName
private void updateFieldName() -
isDocumentPdf2
private boolean isDocumentPdf2() -
applyAccessibilityProperties
protected void applyAccessibilityProperties(PdfFormField formField, IAccessibleElement modelElement, PdfDocument pdfDocument) -
embedMacTokenIntoSignatureContainer
private byte[] embedMacTokenIntoSignatureContainer(byte[] signatureContainer) -
applyDefaultPropertiesForTheNewField
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setContent
private void setContent() -
generateSignatureText
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populateExistingModelElement
private void populateExistingModelElement() -
fillInAppearanceText
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getFieldName
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