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qca/include/QtCrypto/qca_securemessage.h
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/*
* qca_securemessage.h - Qt Cryptographic Architecture
* Copyright (C) 2003-2007 Justin Karneges <justin@affinix.com>
* Copyright (C) 2004,2005 Brad Hards <bradh@frogmouth.net>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301 USA
*
*/
/**
\file qca_securemessage.h
Header file for secure message (PGP, CMS) classes
\note You should not use this header directly from an
application. You should just use <tt> \#include \<QtCrypto>
</tt> instead.
*/
#ifndef QCA_SECUREMESSAGE_H
#define QCA_SECUREMESSAGE_H
#include "qca_cert.h"
#include "qca_core.h"
#include "qca_publickey.h"
#include <QObject>
class QDateTime;
namespace QCA {
class SecureMessageSystem;
/**
\class SecureMessageKey qca_securemessage.h QtCrypto
Key for SecureMessage system
\ingroup UserAPI
*/
class QCA_EXPORT SecureMessageKey
{
public:
/**
The key type
*/
enum Type
{
None, ///< no key
PGP, ///< Pretty Good Privacy key
X509 ///< X.509 CMS key
};
/**
Construct an empty key
*/
SecureMessageKey();
/**
Standard copy constructor
\param from the source key
*/
SecureMessageKey(const SecureMessageKey &from);
~SecureMessageKey();
/**
Standard assignment operator
\param from the source key
*/
SecureMessageKey &operator=(const SecureMessageKey &from);
/**
Returns true for null object
*/
bool isNull() const;
/**
The key type
*/
Type type() const;
/**
Public key part of a PGP key
*/
PGPKey pgpPublicKey() const;
/**
Private key part of a PGP key
*/
PGPKey pgpSecretKey() const;
/**
Set the public key part of a PGP key
\param pub the PGP public key
*/
void setPGPPublicKey(const PGPKey &pub);
/**
Set the private key part of a PGP key
\param sec the PGP secretkey
*/
void setPGPSecretKey(const PGPKey &sec);
/**
The X.509 certificate chain (public part) for this key
*/
CertificateChain x509CertificateChain() const;
/**
The X.509 private key part of this key
*/
PrivateKey x509PrivateKey() const;
/**
Set the public key part of this X.509 key.
\param c the Certificate chain containing the public keys
*/
void setX509CertificateChain(const CertificateChain &c);
/**
Set the private key part of this X.509 key.
\param k the private key
*/
void setX509PrivateKey(const PrivateKey &k);
/**
Set the public and private part of this X.509 key with KeyBundle.
\param kb the public and private key bundle
*/
void setX509KeyBundle(const KeyBundle &kb);
/**
Test if this key contains a private key part
*/
bool havePrivate() const;
/**
The name associated with this key
For a PGP key, this is the primary user ID
For an X.509 key, this is the Common Name
*/
QString name() const;
private:
class Private;
QSharedDataPointer<Private> d;
};
/**
A list of message keys
*/
typedef QList<SecureMessageKey> SecureMessageKeyList;
/**
\class SecureMessageSignature qca_securemessage.h QtCrypto
SecureMessage signature
\ingroup UserAPI
*/
class QCA_EXPORT SecureMessageSignature
{
public:
/**
The result of identity verification
*/
enum IdentityResult
{
Valid, ///< indentity is verified, matches signature
InvalidSignature, ///< valid key provided, but signature failed
InvalidKey, ///< invalid key provided
NoKey ///< identity unknown
};
/**
Create an empty signature check object.
User applications don't normally need to create signature checks. You normally
get the object back as a result of a SecureMessage operation.
*/
SecureMessageSignature();
/**
Create a signature check object
User applications don't normally need to create signature checks. You normally
get the object back as a result of a SecureMessage operation.
\param r the result of the check
\param v the Validity of the key validation check
\param key the key associated with the signature
\param ts the timestamp associated with the signature
*/
SecureMessageSignature(IdentityResult r, Validity v, const SecureMessageKey &key, const QDateTime &ts);
/**
Standard copy constructor
\param from the source signature object
*/
SecureMessageSignature(const SecureMessageSignature &from);
~SecureMessageSignature();
/**
Standard assignment operator
\param from the source signature object
*/
SecureMessageSignature &operator=(const SecureMessageSignature &from);
/**
get the results of the identity check on this signature
*/
IdentityResult identityResult() const;
/**
get the results of the key validation check on this signature
*/
Validity keyValidity() const;
/**
get the key associated with this signature
*/
SecureMessageKey key() const;
/**
get the timestamp associated with this signature
*/
QDateTime timestamp() const;
private:
class Private;
QSharedDataPointer<Private> d;
};
/**
A list of signatures
*/
typedef QList<SecureMessageSignature> SecureMessageSignatureList;
/**
\class SecureMessage qca_securemessage.h QtCrypto
Class representing a secure message
SecureMessage presents a unified interface for working with both
OpenPGP and CMS (S/MIME) messages. Prepare the object by calling
setFormat(), setRecipient(), and setSigner() as necessary, and then
begin the operation by calling an appropriate 'start' function, such
as startSign().
Here is an example of how to perform a Clearsign operation using PGP:
\code
// first make the SecureMessageKey
PGPKey myPGPKey = getSecretKeyFromSomewhere();
SecureMessageKey key;
key.setPGPSecretKey(myPGPKey);
// our data to sign
QByteArray plain = "Hello, world";
// let's do it
OpenPGP pgp;
SecureMessage msg(&pgp);
msg.setSigner(key);
msg.startSign(SecureMessage::Clearsign);
msg.update(plain);
msg.end();
msg.waitForFinished(-1);
if(msg.success())
{
QByteArray result = msg.read();
// result now contains the clearsign text data
}
else
{
// error
...
}
\endcode
Performing a CMS sign operation is similar. Simply set up the
SecureMessageKey with a Certificate instead of a PGPKey, and operate on a
CMS object instead of an OpenPGP object.
\sa SecureMessageKey
\sa SecureMessageSignature
\sa OpenPGP
\sa CMS
\ingroup UserAPI
*/
class QCA_EXPORT SecureMessage : public QObject, public Algorithm
{
Q_OBJECT
public:
/**
The type of secure message
*/
enum Type
{
OpenPGP, ///< a Pretty Good Privacy message
CMS ///< a Cryptographic Message Syntax message
};
/**
The type of message signature
*/
enum SignMode
{
Message, ///< the message includes the signature
Clearsign, ///< the message is clear signed
Detached ///< the signature is detached
};
/**
Formats for secure messages
*/
enum Format
{
Binary, ///< DER/binary
Ascii ///< PEM/ascii-armored
};
/**
Errors for secure messages
*/
enum Error
{
ErrorPassphrase, ///< passphrase was either wrong or not provided
ErrorFormat, ///< input format was bad
ErrorSignerExpired, ///< signing key is expired
ErrorSignerInvalid, ///< signing key is invalid in some way
ErrorEncryptExpired, ///< encrypting key is expired
ErrorEncryptUntrusted, ///< encrypting key is untrusted
ErrorEncryptInvalid, ///< encrypting key is invalid in some way
ErrorNeedCard, ///< pgp card is missing
ErrorCertKeyMismatch, ///< certificate and private key don't match
ErrorUnknown, ///< other error
ErrorSignerRevoked, ///< signing key is revoked
ErrorSignatureExpired, ///< signature is expired
ErrorEncryptRevoked ///< encrypting key is revoked
};
/**
Create a new secure message
This constructor uses an existing
SecureMessageSystem object (for example, an OpenPGP
or CMS object) to generate a specific kind of
secure message.
\param system a pre-existing and configured SecureMessageSystem
object
*/
SecureMessage(SecureMessageSystem *system);
~SecureMessage() override;
/**
The Type of secure message
*/
Type type() const;
/**
Test if the message type supports multiple
(parallel) signatures.
\return true if the secure message support multiple
parallel signatures
\note PGP cannot do this - it is primarily a CMS
feature
*/
bool canSignMultiple() const;
/**
True if the SecureMessageSystem can clearsign
messages.
\note CMS cannot clearsign - this is normally only
available for PGP
*/
bool canClearsign() const;
/**
True if the SecureMessageSystem can both sign and
encrypt (in the same operation).
\note CMS cannot do an integrated sign/encrypt -
this is normally only available for PGP. You can do
separate signing and encrypting operations on the
same message with CMS though.
*/
bool canSignAndEncrypt() const;
/**
Reset the object state to that of original construction.
Now a new operation can be performed immediately.
*/
void reset();
/**
Returns true if bundling of the signer certificate chain is
enabled
*/
bool bundleSignerEnabled() const;
/**
Returns true if inclusion of S/MIME attributes is enabled
*/
bool smimeAttributesEnabled() const;
/**
Return the format type set for this message
*/
Format format() const;
/**
Return the recipient(s) set for this message with setRecipient() or
setRecipients()
*/
SecureMessageKeyList recipientKeys() const;
/**
Return the signer(s) set for this message with setSigner() or
setSigners()
*/
SecureMessageKeyList signerKeys() const;
/**
For CMS only, this will bundle the signer certificate chain
into the message. This allows a message to be verified
on its own, without the need to have obtained the signer's
certificate in advance. Email clients using S/MIME often
bundle the signer, greatly simplifying key management.
This behavior is enabled by default.
\param b whether to bundle (if true) or not (false)
*/
void setBundleSignerEnabled(bool b);
/**
For CMS only, this will put extra attributes into the
message related to S/MIME, such as the preferred
type of algorithm to use in replies. The attributes
used are decided by the provider.
This behavior is enabled by default.
\param b whether to embed extra attribues (if true) or not (false)
*/
void setSMIMEAttributesEnabled(bool b);
/**
Set the Format used for messages
The default is Binary.
\param f whether to use Binary or Ascii
*/
void setFormat(Format f);
/**
Set the recipient for an encrypted message
\param key the recipient's key
\sa setRecipients
*/
void setRecipient(const SecureMessageKey &key);
/**
Set the list of recipients for an encrypted message.
For a list with one item, this has the same effect as setRecipient.
\param keys the recipients' key
\sa setRecipient
*/
void setRecipients(const SecureMessageKeyList &keys);
/**
Set the signer for a signed message.
This is used for both creating signed messages as well as for
verifying CMS messages that have no signer bundled.
\param key the key associated with the signer
\sa setSigners
*/
void setSigner(const SecureMessageKey &key);
/**
Set the list of signers for a signed message.
This is used for both creating signed messages as well as for
verifying CMS messages that have no signer bundled.
For a list with one item, this has the same effect as setSigner.
\param keys the key associated with the signer
\sa setSigner
*/
void setSigners(const SecureMessageKeyList &keys);
/**
Start an encryption operation
You will normally use this with some code along
these lines:
\code
encryptingObj.startEncrypt();
encryptingObj.update(message);
// perhaps some more update()s
encryptingObj.end();
\endcode
Each update() may (or may not) result in some
encrypted data, as indicated by the readyRead()
signal being emitted. Alternatively, you can wait
until the whole message is available (using either
waitForFinished(), or use the finished()
signal. The encrypted message can then be read
using the read() method.
*/
void startEncrypt();
/**
Start an decryption operation
You will normally use this with some code along
these lines:
\code
decryptingObj.startEncrypt();
decryptingObj.update(message);
// perhaps some more update()s
decryptingObj.end();
\endcode
Each update() may (or may not) result in some
decrypted data, as indicated by the readyRead()
signal being emitted. Alternatively, you can wait
until the whole message is available (using either
waitForFinished(), or the finished()
signal). The decrypted message can then be read
using the read() method.
\note If decrypted result is also signed (not for
CMS), then the signature will be verified during
this operation.
*/
void startDecrypt();
/**
Start a signing operation
You will normally use this with some code along
these lines:
\code
signingObj.startSign(QCA::SecureMessage::Detached)
signingObj.update(message);
// perhaps some more update()s
signingObj.end();
\endcode
For Detached signatures, you won't get any results
until the whole process is done - you either
waitForFinished(), or use the finished() signal, to
figure out when you can get the signature (using
the signature() method, not using read()). For
other formats, you can use the readyRead() signal
to determine when there may be part of a signed
message to read().
\param m the mode that will be used to generate the
signature
*/
void startSign(SignMode m = Message);
/**
Start a verification operation
\param detachedSig the detached signature to
verify. Do not pass a signature for other signature
types.
*/
void startVerify(const QByteArray &detachedSig = QByteArray());
/**
Start a combined signing and encrypting
operation. You use this in the same way as
startEncrypt().
\note This may not be possible (e.g. CMS
cannot do this) - see canSignAndEncrypt() for a
suitable test.
*/
void startSignAndEncrypt();
/**
Process a message (or the next part of a message)
in the current operation. You need to have already
set up the message (startEncrypt(), startDecrypt(),
startSign(), startSignAndEncrypt() and
startVerify()) before calling this method.
\param in the data to process
*/
void update(const QByteArray &in);
/**
Read the available data.
\note For detached signatures, you don't get
anything back using this method. Use signature() to
get the detached signature().
*/
QByteArray read();
/**
The number of bytes available to be read.
*/
int bytesAvailable() const;
/**
Complete an operation.
You need to call this method after you have
processed the message (which you pass in as the
argument to update().
\note the results of the operation are not
available as soon as this method returns. You need
to wait for the finished() signal, or use
waitForFinished().
*/
void end();
/**
Block until the operation (encryption, decryption,
signing or verifying) completes.
\param msecs the number of milliseconds to wait for
the operation to complete. Pass -1 to wait
indefinitely.
\note You should not use this in GUI
applications where the blocking behaviour looks
like a hung application. Instead, connect the
finished() signal to a slot that handles the
results.
\note This synchronous operation may require event handling, and so
it must not be called from the same thread as an EventHandler.
*/
bool waitForFinished(int msecs = 30000);
/**
Indicates whether or not the operation was successful
or failed. If this function returns false, then
the reason for failure can be obtained with errorCode().
\sa errorCode
\sa diagnosticText
*/
bool success() const;
/**
Returns the failure code.
\sa success
\sa diagnosticText
*/
Error errorCode() const;
/**
The signature for the message. This is only used
for Detached signatures. For other message types,
you get the message and signature together using
read().
*/
QByteArray signature() const;
/**
The name of the hash used for the signature process
*/
QString hashName() const;
/**
Test if the message was signed.
This is true for OpenPGP if the decrypted message
was also signed.
\return true if the message was signed.
*/
bool wasSigned() const;
/**
Verify that the message signature is correct.
\return true if the signature is valid for the
message, otherwise return false
*/
bool verifySuccess() const;
/**
Information on the signer for the message
*/
SecureMessageSignature signer() const;
/**
Information on the signers for the message.
This is only meaningful if the message type supports
multiple signatures (see canSignMultiple() for a
suitable test).
*/
SecureMessageSignatureList signers() const;
/**
Returns a log of technical information about the operation,
which may be useful for presenting to the user in an
advanced error dialog.
*/
QString diagnosticText() const;
Q_SIGNALS:
/**
This signal is emitted when there is some data to
read. Typically you connect this signal to a slot
that does a read() of the available data.
\note This signal does not mean that the processing
of a message is necessarily complete - see
finished().
*/
void readyRead();
/**
This signal is emitted when data has been accepted
by the message processor.
\param bytes the number of bytes written
*/
void bytesWritten(int bytes);
/**
This signal is emitted when the message is fully
processed.
*/
void finished();
private:
Q_DISABLE_COPY(SecureMessage)
class Private;
friend class Private;
Private *d;
};
/**
\class SecureMessageSystem qca_securemessage.h QtCrypto
Abstract superclass for secure messaging systems
\sa SecureMessage
\sa SecureMessageKey
\ingroup UserAPI
*/
class QCA_EXPORT SecureMessageSystem : public QObject, public Algorithm
{
Q_OBJECT
public:
~SecureMessageSystem() override;
protected:
/**
Protected constructor for SecureMessageSystem
classes. You are meant to be using a subclass (such
as OpenPGP or CMS) - you only need to worry about
this class if you are creating a whole new
SecureMessageSystem type.
\param parent the parent object for this object
\param type the name of the Type of
SecureMessageSystem to create
\param provider the provider to use, if a specific
provider is required.
*/
SecureMessageSystem(QObject *parent, const QString &type, const QString &provider);
private:
Q_DISABLE_COPY(SecureMessageSystem)
};
/**
\class OpenPGP qca_securemessage.h QtCrypto
Pretty Good Privacy messaging system
\sa SecureMessage
\sa SecureMessageKey
\ingroup UserAPI
*/
class QCA_EXPORT OpenPGP : public SecureMessageSystem
{
Q_OBJECT
public:
/**
Standard constructor
\param parent the parent object for this object
\param provider the provider to use, if a specific
provider is required
*/
explicit OpenPGP(QObject *parent = nullptr, const QString &provider = QString());
~OpenPGP() override;
private:
Q_DISABLE_COPY(OpenPGP)
class Private;
Private *d;
};
/**
\class CMS qca_securemessage.h QtCrypto
Cryptographic Message Syntax messaging system
Cryptographic Message Syntax (%CMS) "is used to digitally
sign, digest, authenticate, or encrypt arbitrary message
content. The %CMS describes an encapsulation syntax for
data protection. It supports digital signatures and
encryption. The syntax allows multiple encapsulations; one
encapsulation envelope can be nested inside another.
Likewise, one party can digitally sign some previously
encapsulated data. It also allows arbitrary attributes,
such as signing time, to be signed along with the message
content, and provides for other attributes such as
countersignatures to be associated with a signature." (from
<a href="http://www.ietf.org/rfc/rfc3852.txt">RFC3852</a>
"Cryptographic Message Syntax")
\sa SecureMessage
\sa SecureMessageKey
\ingroup UserAPI
*/
class QCA_EXPORT CMS : public SecureMessageSystem
{
Q_OBJECT
public:
/**
Standard constructor
\param parent the parent object for this object
\param provider the provider to use, if a specific
provider is required
*/
explicit CMS(QObject *parent = nullptr, const QString &provider = QString());
~CMS() override;
/**
Return the trusted certificates set for this object
*/
CertificateCollection trustedCertificates() const;
/**
Return the untrusted certificates set for this object
*/
CertificateCollection untrustedCertificates() const;
/**
Return the private keys set for this object
*/
SecureMessageKeyList privateKeys() const;
/**
Set the trusted certificates to use for the
messages built using this CMS object.
\param trusted the collection of trusted
certificates to use
*/
void setTrustedCertificates(const CertificateCollection &trusted);
/**
Set the untrusted certificates to use for the
messages built using this CMS object.
This function is useful when verifying messages that don't
contain the certificates (or intermediate signers) within
the CMS blob. In order to verify such messages, you'll
have to pass the possible signer certs with this function.
\param untrusted the collection of untrusted
certificates to use
*/
void setUntrustedCertificates(const CertificateCollection &untrusted);
/**
Set the private keys to use for the messages built
using this CMS object.
Keys are required for decrypting and signing (not
for encrypting or verifying).
\param keys the collection of keys to use
*/
void setPrivateKeys(const SecureMessageKeyList &keys);
private:
Q_DISABLE_COPY(CMS)
class Private;
Private *d;
};
}
#endif
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