com.lowagie.text.pdf
Class PdfPKCS7

java.lang.Object
  extended by com.lowagie.text.pdf.PdfPKCS7

public class PdfPKCS7
extends Object

This class does all the processing related to signing and verifying a PKCS#7 signature.

It's based in code found at org.bouncycastle.


Nested Class Summary
static class PdfPKCS7.X509Name
          a class that holds an X509 name
static class PdfPKCS7.X509NameTokenizer
          class for breaking up an X500 Name into it's component tokens, ala java.util.StringTokenizer.
 
Constructor Summary
PdfPKCS7(byte[] contentsKey, byte[] certsKey, String provider)
          Verifies a signature using the sub-filter adbe.x509.rsa_sha1.
PdfPKCS7(byte[] contentsKey, String provider)
          Verifies a signature using the sub-filter adbe.pkcs7.detached or adbe.pkcs7.sha1.
PdfPKCS7(PrivateKey privKey, Certificate[] certChain, CRL[] crlList, String hashAlgorithm, String provider, boolean hasRSAdata)
          Generates a signature.
 
Method Summary
 byte[] getAuthenticatedAttributeBytes(byte[] secondDigest, Calendar signingTime)
          When using authenticatedAttributes the authentication process is different.
 Certificate[] getCertificates()
          Get the X.509 certificates associated with this PKCS#7 object
 Collection getCRLs()
          Get the X.509 certificate revocation lists associated with this PKCS#7 object
 String getDigestAlgorithm()
          Get the algorithm used to calculate the message digest
 byte[] getEncodedPKCS1()
          Gets the bytes for the PKCS#1 object.
 byte[] getEncodedPKCS7()
          Gets the bytes for the PKCS7SignedData object.
 byte[] getEncodedPKCS7(byte[] secondDigest, Calendar signingTime)
          Gets the bytes for the PKCS7SignedData object.
 String getHashAlgorithm()
          Returns the algorithm.
static PdfPKCS7.X509Name getIssuerFields(X509Certificate cert)
          Get the issuer fields from an X509 Certificate
 String getLocation()
          Getter for property location.
 String getReason()
          Getter for property reason.
 Calendar getSignDate()
          Getter for property signDate.
 X509Certificate getSigningCertificate()
          Get the X.509 certificate actually used to sign the digest.
 int getSigningInfoVersion()
          Get the version of the PKCS#7 "SignerInfo" object.
 String getSignName()
          Getter for property sigName.
static PdfPKCS7.X509Name getSubjectFields(X509Certificate cert)
          Get the subject fields from an X509 Certificate
 int getVersion()
          Get the version of the PKCS#7 object.
static KeyStore loadCacertsKeyStore()
          Loads the default root certificates at <java.home>/lib/security/cacerts with the default provider.
static KeyStore loadCacertsKeyStore(String provider)
          Loads the default root certificates at <java.home>/lib/security/cacerts.
 void setExternalDigest(byte[] digest, byte[] RSAdata, String digestEncryptionAlgorithm)
          Sets the digest/signature to an external calculated value.
 void setLocation(String location)
          Setter for property location.
 void setReason(String reason)
          Setter for property reason.
 void setSignDate(Calendar signDate)
          Setter for property signDate.
 void setSignName(String signName)
          Setter for property sigName.
 void update(byte[] buf, int off, int len)
          Update the digest with the specified bytes.
 boolean verify()
          Verify the digest.
static String verifyCertificate(X509Certificate cert, Collection crls, Calendar calendar)
          Verifies a single certificate.
static Object[] verifyCertificates(Certificate[] certs, KeyStore keystore, Collection crls, Calendar calendar)
          Verifies a certificate chain against a KeyStore.
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

PdfPKCS7

public PdfPKCS7(byte[] contentsKey,
                byte[] certsKey,
                String provider)
         throws SecurityException,
                CRLException,
                InvalidKeyException,
                CertificateException,
                NoSuchProviderException,
                NoSuchAlgorithmException,
                IOException
Verifies a signature using the sub-filter adbe.x509.rsa_sha1.

Parameters:
contentsKey - the /Contents key
certsKey - the /Cert key
provider - the provider or null for the default provider
Throws:
SecurityException - on error
CRLException - on error
InvalidKeyException - on error
CertificateException - on error
NoSuchProviderException - on error
NoSuchAlgorithmException - on error
IOException - on error

PdfPKCS7

public PdfPKCS7(byte[] contentsKey,
                String provider)
         throws SecurityException,
                CRLException,
                InvalidKeyException,
                CertificateException,
                NoSuchProviderException,
                NoSuchAlgorithmException
Verifies a signature using the sub-filter adbe.pkcs7.detached or adbe.pkcs7.sha1.

Parameters:
contentsKey - the /Contents key
provider - the provider or null for the default provider
Throws:
SecurityException - on error
CRLException - on error
InvalidKeyException - on error
CertificateException - on error
NoSuchProviderException - on error
NoSuchAlgorithmException - on error

PdfPKCS7

public PdfPKCS7(PrivateKey privKey,
                Certificate[] certChain,
                CRL[] crlList,
                String hashAlgorithm,
                String provider,
                boolean hasRSAdata)
         throws SecurityException,
                InvalidKeyException,
                NoSuchProviderException,
                NoSuchAlgorithmException
Generates a signature.

Parameters:
privKey - the private key
certChain - the certificate chain
crlList - the certificate revocation list
hashAlgorithm - the hash algorithm
provider - the provider or null for the default provider
hasRSAdata - true if the sub-filter is adbe.pkcs7.sha1
Throws:
SecurityException - on error
InvalidKeyException - on error
NoSuchProviderException - on error
NoSuchAlgorithmException - on error
Method Detail

update

public void update(byte[] buf,
                   int off,
                   int len)
            throws SignatureException
Update the digest with the specified bytes. This method is used both for signing and verifying

Parameters:
buf - the data buffer
off - the offset in the data buffer
len - the data length
Throws:
SignatureException - on error

verify

public boolean verify()
               throws SignatureException
Verify the digest.

Returns:
true if the signature checks out, false otherwise
Throws:
SignatureException - on error

getCertificates

public Certificate[] getCertificates()
Get the X.509 certificates associated with this PKCS#7 object

Returns:
the X.509 certificates associated with this PKCS#7 object

getCRLs

public Collection getCRLs()
Get the X.509 certificate revocation lists associated with this PKCS#7 object

Returns:
the X.509 certificate revocation lists associated with this PKCS#7 object

getSigningCertificate

public X509Certificate getSigningCertificate()
Get the X.509 certificate actually used to sign the digest.

Returns:
the X.509 certificate actually used to sign the digest

getVersion

public int getVersion()
Get the version of the PKCS#7 object. Always 1

Returns:
the version of the PKCS#7 object. Always 1

getSigningInfoVersion

public int getSigningInfoVersion()
Get the version of the PKCS#7 "SignerInfo" object. Always 1

Returns:
the version of the PKCS#7 "SignerInfo" object. Always 1

getDigestAlgorithm

public String getDigestAlgorithm()
Get the algorithm used to calculate the message digest

Returns:
the algorithm used to calculate the message digest

getHashAlgorithm

public String getHashAlgorithm()
Returns the algorithm.

Returns:
the digest algorithm

loadCacertsKeyStore

public static KeyStore loadCacertsKeyStore()
Loads the default root certificates at <java.home>/lib/security/cacerts with the default provider.

Returns:
a KeyStore

loadCacertsKeyStore

public static KeyStore loadCacertsKeyStore(String provider)
Loads the default root certificates at <java.home>/lib/security/cacerts.

Parameters:
provider - the provider or null for the default provider
Returns:
a KeyStore

verifyCertificate

public static String verifyCertificate(X509Certificate cert,
                                       Collection crls,
                                       Calendar calendar)
Verifies a single certificate.

Parameters:
cert - the certificate to verify
crls - the certificate revocation list or null
calendar - the date or null for the current date
Returns:
a String with the error description or null if no error

verifyCertificates

public static Object[] verifyCertificates(Certificate[] certs,
                                          KeyStore keystore,
                                          Collection crls,
                                          Calendar calendar)
Verifies a certificate chain against a KeyStore.

Parameters:
certs - the certificate chain
keystore - the KeyStore
crls - the certificate revocation list or null
calendar - the date or null for the current date
Returns:
null if the certificate chain could be validade or a Object[]{cert,error} where cert is the failed certificate and error is the error message

getIssuerFields

public static PdfPKCS7.X509Name getIssuerFields(X509Certificate cert)
Get the issuer fields from an X509 Certificate

Parameters:
cert - an X509Certificate
Returns:
an X509Name

getSubjectFields

public static PdfPKCS7.X509Name getSubjectFields(X509Certificate cert)
Get the subject fields from an X509 Certificate

Parameters:
cert - an X509Certificate
Returns:
an X509Name

getEncodedPKCS1

public byte[] getEncodedPKCS1()
Gets the bytes for the PKCS#1 object.

Returns:
a byte array

setExternalDigest

public void setExternalDigest(byte[] digest,
                              byte[] RSAdata,
                              String digestEncryptionAlgorithm)
Sets the digest/signature to an external calculated value.

Parameters:
digest - the digest. This is the actual signature
RSAdata - the extra data that goes into the data tag in PKCS#7
digestEncryptionAlgorithm - the encryption algorithm. It may must be null if the digest is also null. If the digest is not null then it may be "RSA" or "DSA"

getEncodedPKCS7

public byte[] getEncodedPKCS7()
Gets the bytes for the PKCS7SignedData object.

Returns:
the bytes for the PKCS7SignedData object

getEncodedPKCS7

public byte[] getEncodedPKCS7(byte[] secondDigest,
                              Calendar signingTime)
Gets the bytes for the PKCS7SignedData object. Optionally the authenticatedAttributes in the signerInfo can also be set. If either of the parameters is null, none will be used.

Parameters:
secondDigest - the digest in the authenticatedAttributes
signingTime - the signing time in the authenticatedAttributes
Returns:
the bytes for the PKCS7SignedData object

getAuthenticatedAttributeBytes

public byte[] getAuthenticatedAttributeBytes(byte[] secondDigest,
                                             Calendar signingTime)
When using authenticatedAttributes the authentication process is different. The document digest is generated and put inside the attribute. The signing is done over the DER encoded authenticatedAttributes. This method provides that encoding and the parameters must be exactly the same as in getEncodedPKCS7(byte[],Calendar).

A simple example:

 Calendar cal = Calendar.getInstance();
 PdfPKCS7 pk7 = new PdfPKCS7(key, chain, null, "SHA1", null, false);
 MessageDigest messageDigest = MessageDigest.getInstance("SHA1");
 byte buf[] = new byte[8192];
 int n;
 InputStream inp = sap.getRangeStream();
 while ((n = inp.read(buf)) > 0) {
    messageDigest.update(buf, 0, n);
 }
 byte hash[] = messageDigest.digest();
 byte sh[] = pk7.getAuthenticatedAttributeBytes(hash, cal);
 pk7.update(sh, 0, sh.length);
 byte sg[] = pk7.getEncodedPKCS7(hash, cal);
 

Parameters:
secondDigest - the content digest
signingTime - the signing time
Returns:
the byte array representation of the authenticatedAttributes ready to be signed

getReason

public String getReason()
Getter for property reason.

Returns:
Value of property reason.

setReason

public void setReason(String reason)
Setter for property reason.

Parameters:
reason - New value of property reason.

getLocation

public String getLocation()
Getter for property location.

Returns:
Value of property location.

setLocation

public void setLocation(String location)
Setter for property location.

Parameters:
location - New value of property location.

getSignDate

public Calendar getSignDate()
Getter for property signDate.

Returns:
Value of property signDate.

setSignDate

public void setSignDate(Calendar signDate)
Setter for property signDate.

Parameters:
signDate - New value of property signDate.

getSignName

public String getSignName()
Getter for property sigName.

Returns:
Value of property sigName.

setSignName

public void setSignName(String signName)
Setter for property sigName.

Parameters:
signName - New value of property sigName.


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