openpgp

package
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 Go to latest Published: Jan 23, 2020 License: BSD-3-Clause Imports: 13 Imported by: 244

Documentation

Overview

Package openpgp implements high level operations on OpenPGP messages.

Index

Constants

This section is empty.

Variables

View Source 
var PrivateKeyType = "PGP PRIVATE KEY BLOCK"

PrivateKeyType is the armor type for a PGP private key.

View Source 
var PublicKeyType = "PGP PUBLIC KEY BLOCK"

PublicKeyType is the armor type for a PGP public key.

View Source 
var SignatureType = "PGP SIGNATURE"

SignatureType is the armor type for a PGP signature.

Functions

func ArmoredDetachSign 

func ArmoredDetachSign(w io.Writer, signer *Entity, message io.Reader, config *packet.Config) (err error)

ArmoredDetachSign signs message with the private key from signer (which must already have been decrypted) and writes an armored signature to w. If config is nil, sensible defaults will be used.

func ArmoredDetachSignText 

func ArmoredDetachSignText(w io.Writer, signer *Entity, message io.Reader, config *packet.Config) error

ArmoredDetachSignText signs message (after canonicalising the line endings) with the private key from signer (which must already have been decrypted) and writes an armored signature to w. If config is nil, sensible defaults will be used.

func AttachedSign 

func AttachedSign(out io.WriteCloser, signed Entity, hints *FileHints,
	config *packet.Config) (in io.WriteCloser, err error)

AttachedSign is like openpgp.Encrypt (as in p.crypto/openpgp/write.go), but don't encrypt at all, just sign the literal unencrypted data. Unfortunately we need to duplicate some code here that's already in write.go

func DetachSign 

func DetachSign(w io.Writer, signer *Entity, message io.Reader, config *packet.Config) error

DetachSign signs message with the private key from signer (which must already have been decrypted) and writes the signature to w. If config is nil, sensible defaults will be used.

func DetachSignText 

func DetachSignText(w io.Writer, signer *Entity, message io.Reader, config *packet.Config) error

DetachSignText signs message (after canonicalising the line endings) with the private key from signer (which must already have been decrypted) and writes the signature to w. If config is nil, sensible defaults will be used.

func Encrypt 

func Encrypt(ciphertext io.Writer, to []*Entity, signed *Entity, hints *FileHints, config *packet.Config) (plaintext io.WriteCloser, err error)

Encrypt encrypts a message to a number of recipients and, optionally, signs it. hints contains optional information, that is also encrypted, that aids the recipients in processing the message. The resulting WriteCloser must be closed after the contents of the file have been written. If config is nil, sensible defaults will be used.

func NewCanonicalTextHash 

func NewCanonicalTextHash(h hash.Hash) hash.Hash

NewCanonicalTextHash reformats text written to it into the canonical form and then applies the hash h. See RFC 4880, section 5.2.1.

func SignWithSigner 

func SignWithSigner(s packet.Signer, w io.Writer, message io.Reader, sigType packet.SignatureType, config *packet.Config) (err error)

SignWithSigner signs the message of type sigType with s and writes the signature to w. If config is nil, sensible defaults will be used.

func SymmetricallyEncrypt 

func SymmetricallyEncrypt(ciphertext io.Writer, passphrase []byte, hints *FileHints, config *packet.Config) (plaintext io.WriteCloser, err error)

SymmetricallyEncrypt acts like gpg -c: it encrypts a file with a passphrase. The resulting WriteCloser must be closed after the contents of the file have been written. If config is nil, sensible defaults will be used.

Types

type BadSubkey 

type BadSubkey struct {
	Subkey
	Err error
}

BadSubkey is one that failed reconstruction, but we'll keep it around for informational purposes.

type Entity 

type Entity struct {
	PrimaryKey  *packet.PublicKey
	PrivateKey  *packet.PrivateKey
	Identities  map[string]*Identity // indexed by Identity.Name
	Revocations []*packet.Signature
	// Revocations that are signed by designated revokers. Reading keys
	// will not verify these revocations, because it won't have access to
	// issuers' public keys, API consumers should do this instead (or
	// not, and just assume that the key is probably revoked).
	UnverifiedRevocations []*packet.Signature
	Subkeys               []Subkey
	BadSubkeys            []BadSubkey
}

An Entity represents the components of an OpenPGP key: a primary public key (which must be a signing key), one or more identities claimed by that key, and zero or more subkeys, which may be encryption keys.

func CheckArmoredDetachedSignature 

func CheckArmoredDetachedSignature(keyring KeyRing, signed, signature io.Reader) (signer *Entity, err error)

CheckArmoredDetachedSignature performs the same actions as CheckDetachedSignature but expects the signature to be armored.

func CheckDetachedSignature 

func CheckDetachedSignature(keyring KeyRing, signed, signature io.Reader) (signer *Entity, err error)

CheckDetachedSignature takes a signed file and a detached signature and returns the signer if the signature is valid. If the signer isn't known, ErrUnknownIssuer is returned.

func NewEntity 

func NewEntity(name, comment, email string, config *packet.Config) (*Entity, error)

NewEntity returns an Entity that contains a fresh RSA/RSA keypair with a single identity composed of the given full name, comment and email, any of which may be empty but must not contain any of "()<>\x00". If config is nil, sensible defaults will be used.

func ReadEntity 

func ReadEntity(packets *packet.Reader) (*Entity, error)

ReadEntity reads an entity (public key, identities, subkeys etc) from the given Reader.

func (*Entity) CopySubkeyRevocations 

func (e *Entity) CopySubkeyRevocations(src *Entity)

CopySubkeyRevocations copies subkey revocations from the src Entity over to the receiver entity. We need this because `gpg --export-secret-key` does not appear to output subkey revocations. In this case we need to manually merge with the output of `gpg --export`.

func (*Entity) Serialize 

func (e *Entity) Serialize(w io.Writer) error

Serialize writes the public part of the given Entity to w. (No private key material will be output).

func (*Entity) SerializePrivate 

func (e *Entity) SerializePrivate(w io.Writer, config *packet.Config) (err error)

SerializePrivate serializes an Entity, including private key material, to the given Writer. For now, it must only be used on an Entity returned from NewEntity. If config is nil, sensible defaults will be used.

func (*Entity) SignIdentity 

func (e *Entity) SignIdentity(identity string, signer *Entity, config *packet.Config) error

SignIdentity adds a signature to e, from signer, attesting that identity is associated with e. The provided identity must already be an element of e.Identities and the private key of signer must have been decrypted if necessary. If config is nil, sensible defaults will be used.

type EntityList 

type EntityList []*Entity

An EntityList contains one or more Entities.

func ReadArmoredKeyRing 

func ReadArmoredKeyRing(r io.Reader) (EntityList, error)

ReadArmoredKeyRing reads one or more public/private keys from an armor keyring file.

func ReadKeyRing 

func ReadKeyRing(r io.Reader) (el EntityList, err error)

ReadKeyRing reads one or more public/private keys. Unsupported keys are ignored as long as at least a single valid key is found.

func (EntityList) DecryptionKeys 

func (el EntityList) DecryptionKeys() (keys []Key)

DecryptionKeys returns all private keys that are valid for decryption.

func (EntityList) KeysById 

func (el EntityList) KeysById(id uint64, fp []byte) (keys []Key)

KeysById returns the set of keys that have the given key id. fp can be optionally supplied, which is the full key fingerprint. If it's provided, then it must match. This comes up in the case of GPG subpacket 33.

func (EntityList) KeysByIdUsage 

func (el EntityList) KeysByIdUsage(id uint64, fp []byte, requiredUsage byte) (keys []Key)

KeysByIdAndUsage returns the set of keys with the given id that also meet the key usage given by requiredUsage. The requiredUsage is expressed as the bitwise-OR of packet.KeyFlag* values. fp can be optionally supplied, which is the full key fingerprint. If it's provided, then it must match. This comes up in the case of GPG subpacket 33.

type FileHints 

type FileHints struct {
	// IsBinary can be set to hint that the contents are binary data.
	IsBinary bool
	// FileName hints at the name of the file that should be written. It's
	// truncated to 255 bytes if longer. It may be empty to suggest that the
	// file should not be written to disk. It may be equal to "_CONSOLE" to
	// suggest the data should not be written to disk.
	FileName string
	// ModTime contains the modification time of the file, or the zero time if not applicable.
	ModTime time.Time
}

FileHints contains metadata about encrypted files. This metadata is, itself, encrypted.

type Identity 

type Identity struct {
	Name          string // by convention, has the form "Full Name (comment) <email@example.com>"
	UserId        *packet.UserId
	SelfSignature *packet.Signature
	Signatures    []*packet.Signature
	Revocation    *packet.Signature
}

An Identity represents an identity claimed by an Entity and zero or more assertions by other entities about that claim.

type Key 

type Key struct {
	Entity        *Entity
	PublicKey     *packet.PublicKey
	PrivateKey    *packet.PrivateKey
	SelfSignature *packet.Signature
	KeyFlags      packet.KeyFlagBits
}

A Key identifies a specific public key in an Entity. This is either the Entity's primary key or a subkey.

func FindVerifiedDesignatedRevoke 

func FindVerifiedDesignatedRevoke(keyring KeyRing, entity *Entity) (*packet.Signature, *Key)

CheckDesignatedRevokers will try to confirm any of designated revocation of entity. For this function to work, revocation issuer's key should be found in keyring. First successfully verified designated revocation is returned along with the key that verified it.

type KeyRing 

type KeyRing interface {

	// KeysById returns the set of keys that have the given key id.
	// fp can be optionally supplied, which is the full key fingerprint.
	// If it's provided, then it must match. This comes up in the case
	// of GPG subpacket 33.
	KeysById(id uint64, fp []byte) []Key

	// KeysByIdAndUsage returns the set of keys with the given id
	// that also meet the key usage given by requiredUsage.
	// The requiredUsage is expressed as the bitwise-OR of
	// packet.KeyFlag* values.
	// fp can be optionally supplied, which is the full key fingerprint.
	// If it's provided, then it must match. This comes up in the case
	// of GPG subpacket 33.
	KeysByIdUsage(id uint64, fp []byte, requiredUsage byte) []Key

	// DecryptionKeys returns all private keys that are valid for
	// decryption.
	DecryptionKeys() []Key
}

A KeyRing provides access to public and private keys.

type MessageDetails 

type MessageDetails struct {
	IsEncrypted              bool                // true if the message was encrypted.
	EncryptedToKeyIds        []uint64            // the list of recipient key ids.
	IsSymmetricallyEncrypted bool                // true if a passphrase could have decrypted the message.
	DecryptedWith            Key                 // the private key used to decrypt the message, if any.
	IsSigned                 bool                // true if the message is signed.
	SignedByKeyId            uint64              // the key id of the signer, if any.
	SignedBy                 *Key                // the key of the signer, if available.
	LiteralData              *packet.LiteralData // the metadata of the contents
	UnverifiedBody           io.Reader           // the contents of the message.

	// If IsSigned is true and SignedBy is non-zero then the signature will
	// be verified as UnverifiedBody is read. The signature cannot be
	// checked until the whole of UnverifiedBody is read so UnverifiedBody
	// must be consumed until EOF before the data can trusted. Even if a
	// message isn't signed (or the signer is unknown) the data may contain
	// an authentication code that is only checked once UnverifiedBody has
	// been consumed. Once EOF has been seen, the following fields are
	// valid. (An authentication code failure is reported as a
	// SignatureError error when reading from UnverifiedBody.)
	SignatureError error               // nil if the signature is good.
	Signature      *packet.Signature   // the signature packet itself, if v4 (default)
	SignatureV3    *packet.SignatureV3 // the signature packet if it is a v2 or v3 signature

	// Does the Message include multiple signatures? Also called "nested signatures".
	MultiSig bool
	// contains filtered or unexported fields
}

MessageDetails contains the result of parsing an OpenPGP encrypted and/or signed message.

func ReadMessage 

func ReadMessage(r io.Reader, keyring KeyRing, prompt PromptFunction, config *packet.Config) (md *MessageDetails, err error)

ReadMessage parses an OpenPGP message that may be signed and/or encrypted. The given KeyRing should contain both public keys (for signature verification) and, possibly encrypted, private keys for decrypting. If config is nil, sensible defaults will be used.

type PromptFunction 

type PromptFunction func(keys []Key, symmetric bool) ([]byte, error)

A PromptFunction is used as a callback by functions that may need to decrypt a private key, or prompt for a passphrase. It is called with a list of acceptable, encrypted private keys and a boolean that indicates whether a passphrase is usable. It should either decrypt a private key or return a passphrase to try. If the decrypted private key or given passphrase isn't correct, the function will be called again, forever. Any error returned will be passed up.

type Subkey 

type Subkey struct {
	PublicKey  *packet.PublicKey
	PrivateKey *packet.PrivateKey
	Sig        *packet.Signature
	Revocation *packet.Signature
}

A Subkey is an additional public key in an Entity. Subkeys can be used for encryption.

Source Files

View all Source files

Directories

Path Synopsis
Package armor implements OpenPGP ASCII Armor, see RFC 4880.
 Package armor implements OpenPGP ASCII Armor, see RFC 4880.
Package clearsign generates and processes OpenPGP, clear-signed data.
 Package clearsign generates and processes OpenPGP, clear-signed data.
Package elgamal implements ElGamal encryption, suitable for OpenPGP, as specified in "A Public-Key Cryptosystem and a Signature Scheme Based on Discrete Logarithms," IEEE Transactions on Information Theory, v.
 Package elgamal implements ElGamal encryption, suitable for OpenPGP, as specified in "A Public-Key Cryptosystem and a Signature Scheme Based on Discrete Logarithms," IEEE Transactions on Information Theory, v.
Package errors contains common error types for the OpenPGP packages.
 Package errors contains common error types for the OpenPGP packages.
Package packet implements parsing and serialization of OpenPGP packets, as specified in RFC 4880.
 Package packet implements parsing and serialization of OpenPGP packets, as specified in RFC 4880.
Package s2k implements the various OpenPGP string-to-key transforms as specified in RFC 4800 section 3.7.1.
 Package s2k implements the various OpenPGP string-to-key transforms as specified in RFC 4800 section 3.7.1.

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