passforios-gopenpgp/ProposalChanges.md

Model changes

Modified

EncryptedSplit

models.EncryptedSplit struct {
	DataPacket []byte
	KeyPacket  []byte
	Algo       string
}

is now

crypto.PGPSplitMessage struct {
	DataPacket []byte
	KeyPacket  []byte
}

DecryptSignedVerify

models.DecryptSignedVerify struct {
	//clear text
	Plaintext string
	//bitmask verify status : 0
	Verify int
	//error message if verify failed
	Message string
}

is now

// PlainMessage stores an unencrypted text message.
crypto.PlainMessage struct {
	// The content of the message
	Text string
	// If the decoded message was correctly signed. See constants.SIGNATURE* for all values.
 	Verified int
}

SignedString

// SignedString wraps string with Signature
type SignedString struct {
	String string
	Signed *Signature
}

is now

// ClearTextMessage, split signed clear text message container
type ClearTextMessage struct {
	Data []byte
	Signature []byte
}

Dropped

Signature

type Signature struct {
	md *openpgp.MessageDetails
}

pmKeyObject

type pmKeyObject struct {
	ID          string
	Version     int
	Flags       int
	Fingerprint string
	PublicKey   string `json:",omitempty"`
	PrivateKey  string
	Primary int
}

New

PGPMessage

// PGPMessage stores a PGP-encrypted message.
type PGPMessage struct {
	// The content of the message
	Data []byte
}

PGPSignature

// PGPSignature stores a PGP-encoded detached signature.
type PGPSignature struct {
	// The content of the message
	Data []byte
}

SignatureVerificationError

// SignatureVerificationError is returned from Decrypt and VerifyDetached functions when signature verification fails
type SignatureVerificationError struct {
	Status int
	Message string
}

API changes

armor.go

ReadClearSignedMessage

Moved to crypto package. Changed to return ClearTextMessage.

ReadClearSignedMessage(signedMessage string) (string, error):
* NewClearTextMessageFromArmored(signedMessage string) (*ClearTextMessage, error)

In addition, were added:

* NewClearTextMessage(data []byte, signature []byte) *ClearTextMessage
* (msg *ClearTextMessage) GetBinary() []byte
* (msg *ClearTextMessage) GetString() string
* (msg *ClearTextMessage) GetBinarySignature() []byte
* (msg *ClearTextMessage) GetArmored() (string, error)

attachment.go

AttachmentProcessor

No change.

EncryptAttachment

Change encryption parameters to messages: either contextual signature with helper or using messages.

(pm *PmCrypto) EncryptAttachment(plainData []byte, fileName string, publicKey *KeyRing) (*models.EncryptedSplit, error):
* (helper) EncryptSignAttachment(publicKey, privateKey, passphrase, fileName string, plainData []byte) (keyPacket, dataPacket, signature []byte, err error)
* (keyRing *KeyRing) EncryptAttachment(message *PlainMessage, fileName string) (*PGPSplitMessage, error)

EncryptAttachmentLowMemory

Renamed.

(pm *PmCrypto) EncryptAttachmentLowMemory(estimatedSize int, fileName string, publicKey *KeyRing) (*AttachmentProcessor, error):
* (keyRing *KeyRing) NewLowMemoryAttachmentProcessor(estimatedSize int, fileName string) (*AttachmentProcessor, error)

SplitArmor

Renamed, changed model.

SplitArmor(encrypted string) (*models.EncryptedSplit, error):
* NewPGPSplitMessageFromArmored(encrypted string) (*PGPSplitMessage, error)

DecryptAttachment

Same as EncryptAttachment.

(pm *PmCrypto) DecryptAttachment(keyPacket []byte, dataPacket []byte, kr *KeyRing, passphrase string) ([]byte, error):
* (helper) DecryptVerifyAttachment(publicKey, privateKey, passphrase string, keyPacket, dataPacket []byte, armoredSignature string) (plainData []byte, err error)
* (keyRing *KeyRing) DecryptAttachment(message *PGPSplitMessage) (*PlainMessage, error)

key.go

SymmetricKey model and functions have been moved to symmetrickey.go

DecryptAttKey

Renamed, change to []byte as it's a binary keypacket.

DecryptAttKey(kr *KeyRing, keyPacket string) (key *SymmetricKey, err error):
* (keyRing *KeyRing) DecryptSessionKey(keyPacket []byte) (*SymmetricKey, error)

SeparateKeyAndData

This function has been split in two, as it did not only separate the data, but when provided a KeyRing decrypt the session key too.

SeparateKeyAndData(kr *KeyRing, r io.Reader, estimatedLength int, garbageCollector int) (outSplit *models.EncryptedSplit, err error):
* (for separating key and data) (msg *PGPMessage) SeparateKeyAndData(estimatedLength, garbageCollector int) (outSplit *PGPSplitMessage, err error)
* (for decrypting SessionKey) (keyRing *KeyRing) DecryptSessionKey(keyPacket []byte) (*SymmetricKey, error)

encodedLength

Dropped as already present in SeparateKeyAndData and unused.

SetKey

Renamed, change to []byte as it's a binary keypacket.

SetKey(kr *KeyRing, symKey *SymmetricKey) (packets string, err error):
* (keyRing *KeyRing) EncryptSessionKey(sessionSplit *SymmetricKey) ([]byte, error)

IsKeyExpiredBin

Renamed.

(pm *PmCrypto) IsKeyExpiredBin(publicKey []byte) (bool, error):
* (pgp *GopenPGP) IsKeyExpired(publicKey []byte) (bool, error)

IsKeyExpired

Renamed.

(pm *PmCrypto) IsKeyExpired(publicKey string) (bool, error):
* (pgp *GopenPGP) IsArmoredKeyExpired(publicKey string) (bool, error)

GenerateRSAKeyWithPrimes

userName and domain joined in email. Added name parameter. To emulate the old behaviour name = email = userName + "@" + domain.

(pm *PmCrypto) GenerateRSAKeyWithPrimes(userName, domain, passphrase, keyType string, bits int, prime1, prime2, prime3, prime4 []byte) (string, error):
* (pgp *GopenPGP) GenerateRSAKeyWithPrimes(name, email, passphrase, keyType string, bits int, prime1, prime2, prime3, prime4 []byte) (string, error):

GenerateKey

userName and domain joined in email. Added name parameter. To emulate the old behaviour name = email = userName + "@" + domain.

(pm *PmCrypto) GenerateKey(userName, domain, passphrase, keyType string, bits int) (string, error) :
* (pgp *GopenPGP) GenerateKey(name, email, passphrase, keyType string, bits int) (string, error):

UpdatePrivateKeyPassphrase

No change.

CheckKey

Renamed.

(pm *PmCrypto) CheckKey(pubKey string) (string, error):
* (pgp *GopenPGP) PrintFingerprints(pubKey string) (string, error)

keyring.go

Signature.KeyRing

Dropped with signature.

Signature.IsBy

Dropped with signature.

GetEntities

No change.

GetSigningEntity

KeyRings must be already unlocked when provided to encrypt/decrypt/sign/verify functions.

(kr *KeyRing) GetSigningEntity(passphrase string) *openpgp.Entity:
* (keyRing *KeyRing) GetSigningEntity() (*openpgp.Entity, error)

Encrypt, EncryptArmored, EncryptString

This function has been divided in different sub-functions and wrappers have been provided for the key unlock and message models.

(kr *KeyRing) Encrypt(w io.Writer, sign *KeyRing, filename string, canonicalizeText bool) (io.WriteCloser, error):
* (if binary data) (keyRing *KeyRing) Encrypt(message *PlainMessage, privateKey *KeyRing) (*PGPMessage, error)
* (if plain text, wrapped) (helper) EncryptMessageArmored(publicKey, plaintext string) (ciphertext string, err error)
* (if plain text, wrapped, signed) (helper) EncryptSignMessageArmored(publicKey, privateKey, passphrase, plaintext string) (ciphertext string, err error)

EncryptCore

Made an internal function.

EncryptSymmetric

Dropped, now the procedure is split in two parts.

(kr *KeyRing) EncryptSymmetric(textToEncrypt string, canonicalizeText bool) (outSplit *models.EncryptedSplit, err error):
* (for encrypting) (keyRing *KeyRing) Encrypt*
* (for splitting) (msg *PGPMessage) SeparateKeyAndData(estimatedLength, garbageCollector int) (outSplit *PGPSplitMessage, err error)
* (alternative) (keyRing *KeyRing) EncryptAttachment(message *PlainMessage, fileName string) (*PGPSplitMessage, error)

DecryptString, Decrypt, DecryptArmored

Same as Encrypt*. If signature verification fails it will return a SignatureVerificationError.

(kr *KeyRing) DecryptString(encrypted string) (SignedString, error):
* (if binary data) func (keyRing *KeyRing) Decrypt(message *PGPMessage, verifyKey *KeyRing, verifyTime int64) (*PlainMessage, error)
* (if plain text, wrapped) (helper) DecryptMessageArmored(privateKey, passphrase, ciphertext string) (plaintext string, err error)
* (if plain text, wrapped, verified) (helper) DecryptVerifyMessageArmored(publicKey, privateKey, passphrase, ciphertext string) (plaintext string, err error)

DecryptStringIfNeeded

Replaced with IsPGPMessage + Decrypt*.

(kr *KeyRing) DecryptStringIfNeeded(data string) (decrypted string, err error):
* (pgp *GopenPGP) IsPGPMessage(data string) bool

SignString, DetachedSign

Replaced by signing methods.

(kr *KeyRing) SignString(message string, canonicalizeText bool) (signed string, err error):
(kr *KeyRing) DetachedSign(w io.Writer, toSign io.Reader, canonicalizeText bool, armored bool):
* (keyRing *KeyRing) SignDetached(message *PlainMessage) (*PGPSignature, error)

VerifyString

Same as signing. Returns SignatureVerificationError if the verification fails.

(kr *KeyRing) VerifyString(message, signature string, sign *KeyRing) (err error):
* (to verify) (keyRing *KeyRing) VerifyDetached(message *PlainMessage, signature *PGPSignature, verifyTime int64) error

Unlock

No change. Added:

(keyRing *KeyRing) UnlockWithPassphrase(passphrase string) error

WriteArmoredPublicKey

No change.

ArmoredPublicKeyString

Renamed.

(kr *KeyRing) ArmoredPublicKeyString() (s string, err error):
* (keyRing *KeyRing) GetArmoredPublicKey() (s string, err error)

BuildKeyRing

No change.

BuildKeyRingNoError

No change.

BuildKeyRingArmored

No change.

UnmarshalJSON

Dropped.

Identities

No change

KeyIds

No change.

ReadArmoredKeyRing

No change.

ReadKeyRing

No change.

FilterExpiredKeys

No change.

message.go

Many functions are duplicates of keyring.go

EncryptMessage

See Encrypt*

(pm *PmCrypto) EncryptMessage(plaintext string, publicKey *KeyRing, privateKey *KeyRing, passphrase string, trim bool) (string, error):
* (if binary data) (keyRing *KeyRing) Encrypt(message *PlainMessage, privateKey *KeyRing) (*PGPMessage, error)
* (if plain text, wrapped) (helper) EncryptMessageArmored(publicKey, plaintext string) (ciphertext string, err error)
* (if plain text, wrapped, signed) (helper) EncryptSignMessageArmored(publicKey, privateKey, passphrase, plaintext string) (ciphertext string, err error)

DecryptMessage, DecryptMessageVerify, DecryptMessageStringKey

See Decrypt*

(pm *PmCrypto) DecryptMessage(encryptedText string, privateKey *KeyRing, passphrase string) (string, error):
(pm *PmCrypto) DecryptMessageStringKey(encryptedText string, privateKey string, passphrase string) (string, error):
(pm *PmCrypto) DecryptMessageVerify(encryptedText string, verifierKey *KeyRing, privateKeyRing *KeyRing, passphrase string, verifyTime int64) (*models.DecryptSignedVerify, error) :
* (if binary data) (keyRing *KeyRing) Decrypt(message *PGPMessage, verifyKey *KeyRing, verifyTime int64) (*PlainMessage, error)
* (if plain text, wrapped) (helper) DecryptMessageArmored(privateKey, passphrase, ciphertext string) (plaintext string, err error)
* (if plain text, wrapped, verified) (helper) DecryptVerifyMessageArmored(publicKey, privateKey, passphrase, ciphertext string) (plaintext string, err error)

EncryptMessageWithPassword

The function has been renamed and moved to SymmetricKey to allow more encryption modes. Previously AES-128 (! not 256 as stated) was used.

(pm *PmCrypto) EncryptMessageWithPassword(plaintext string, password string) (string, error):
* (if binary data) (symmetricKey *SymmetricKey) Encrypt(message *PlainMessage) (*PGPMessage, error)
* (if plain text, wrapped) (helper) EncryptMessageWithToken(token, plaintext string) (ciphertext string, err error)
* (if plain text, wrapped) (helper) EncryptMessageWithTokenAlgo(token, plaintext, algo string) (ciphertext string, err error)

DecryptMessageWithPassword

See EncryptMessageWithPassword.

(pm *PmCrypto) DecryptMessageWithPassword(encrypted string, password string) (string, error):
* (if binary data) (symmetricKey *SymmetricKey) Decrypt(message *PGPMessage) (*PlainMessage, error)
* (if plain text, wrapped, for all ciphers) (helper) DecryptMessageWithToken(token, ciphertext string) (plaintext string, err error)

mime.go

DecryptMIMEMessage

Moved to KeyRing.

(pm *PmCrypto) DecryptMIMEMessage(encryptedText string, verifierKey *KeyRing, privateKeyRing *KeyRing, passphrase string, callbacks MIMECallbacks, verifyTime int64):
* (keyRing *KeyRing) DecryptMIMEMessage(message *PGPMessage, verifyKey *KeyRing, callbacks MIMECallbacks, verifyTime int64)

session.go

RandomToken

No change.

RandomTokenWith

Renamed.

(pm *PmCrypto) RandomTokenWith(size int) ([]byte, error):
* (pgp *GopenPGP) RandomTokenSize(size int) ([]byte, error)

GetSessionFromKeyPacket

Dropped, use now DecryptSessionKey.

(pm *PmCrypto) GetSessionFromKeyPacket(keyPackage []byte, privateKey *KeyRing, passphrase string) (*SymmetricKey, error):
* (keyRing *KeyRing) DecryptSessionKey(keyPacket []byte) (*SymmetricKey, error)

KeyPacketWithPublicKey, KeyPacketWithPublicKeyBin

Dropped, use now EncryptSessionKey.

(pm *PmCrypto) KeyPacketWithPublicKey(sessionSplit *SymmetricKey, publicKey string) ([]byte, error):
(pm *PmCrypto) KeyPacketWithPublicKeyBin(sessionSplit *SymmetricKey, publicKey []byte) ([]byte, error):
* (keyRing *KeyRing) EncryptSessionKey(sessionSplit *SymmetricKey) ([]byte, error)

GetSessionFromSymmetricPacket

Renamed, moved to SymmetricKey.

(pm *PmCrypto) GetSessionFromSymmetricPacket(keyPackage []byte, password string) (*SymmetricKey, error):
* NewSymmetricKeyFromKeyPacket(keyPacket []byte, password string) (*SymmetricKey, error)

SymmetricKeyPacketWithPassword

Renamed, moved to SymmetricKey.

(pm *PmCrypto) SymmetricKeyPacketWithPassword(sessionSplit *SymmetricKey, password string) ([]byte, error):
* (symmetricKey *SymmetricKey) EncryptToKeyPacket(password string) ([]byte, error)

sign_detached.go

SignTextDetached

Moved to KeyRing, changed to Sign.

(pm *PmCrypto) SignTextDetached(plaintext string, privateKey *KeyRing, passphrase string, trim bool) (string, error):
* (if just signature) (keyRing *KeyRing) SignDetached(message *PlainMessage) (*PGPSignature, error)
* (if PGP SIGNED MESSAGE) (helper) SignCleartextMessage(keyRing *crypto.KeyRing, text string) (string, error)
* (if PGP SIGNED MESSAGE) (helper) SignCleartextMessageArmored(privateKey, passphrase, text string) (string, error)

SignBinDetached

Moved to KeyRing.

(pm *PmCrypto) SignBinDetached(plainData []byte, privateKey *KeyRing, passphrase string) (string, error):
* (keyRing *KeyRing) SignDetached(message *PlainMessage) (*PGPSignature, error)

VerifyTextSignDetachedBinKey, VerifyBinSignDetachedBinKey

Moved to KeyRing, changed to Verify. See signature_test.go for use examples.

(pm *PmCrypto) VerifyTextSignDetachedBinKey(signature string, plaintext string, publicKey *KeyRing, verifyTime int64) (bool, error):
(pm *PmCrypto) VerifyBinSignDetachedBinKey(signature string, plainData []byte, publicKey *KeyRing, verifyTime int64) (bool, error):
* (to verify) (keyRing *KeyRing) VerifyDetached(message *PlainMessage, signature *PGPSignature, verifyTime int64) (error)
* (if PGP SIGNED MESSAGE) (helper) VerifyCleartextMessage(keyRing *crypto.KeyRing, armored string, verifyTime int64) (string, error)
* (if PGP SIGNED MESSAGE) (helper) VerifyCleartextMessageArmored(publicKey, armored string, verifyTime int64) (string, error)

signature_collector.go

No change.

time.go

UpdateTime

No change.

GetTimeUnix

Renamed.

(pm *PmCrypto) GetTimeUnix() int64:
(pm *PmCrypto) GetUnixTime() int64

GetTime

No change.