authenticode

Documentation

Overview

Package authenticode implements the Microsoft Authenticode standard.

It allows parsing, verifying and signing of PE/COFF binaries.

Index

• Variables
• func CreateSpcIndirectDataContent(digest []byte, alg crypto.Hash) ([]byte, error)
• func Padding(src []byte, blockSize int) []byte
• func PaddingBytes(srcLen, blockSize int) ([]byte, int)
• func SignAuthenticode(signer crypto.Signer, cert *x509.Certificate, digest []byte, alg crypto.Hash) ([]byte, error)
• type Authenticode
  • func ParseAuthenticode(b []byte) (*Authenticode, error)
  • func (a *Authenticode) Verify(cert *x509.Certificate, img []byte) (bool, error)
• type PECOFFBinary
  • func Parse(r io.ReaderAt) (*PECOFFBinary, error)
  • func (p *PECOFFBinary) AppendSignature(sig []byte) error
  • func (p *PECOFFBinary) Bytes() []byte
  • func (p *PECOFFBinary) Hash(h crypto.Hash) []byte
  • func (p *PECOFFBinary) Sign(key crypto.Signer, cert *x509.Certificate) ([]byte, error)
  • func (p *PECOFFBinary) Signatures() ([]*signature.WINCertificate, error)
  • func (p *PECOFFBinary) Verify(cert *x509.Certificate) (bool, error)

Variables

var (
	OIDSpcIndirectDataContent = encasn1.ObjectIdentifier{1, 3, 6, 1, 4, 1, 311, 2, 1, 4}
	OIDSpcPEImageDataObjID    = encasn1.ObjectIdentifier{1, 3, 6, 1, 4, 1, 311, 2, 1, 15}
)

var (
	// No singatures where found in the binary.
	ErrNoSignatures = errors.New("binary has no signatures")

	// No valid signatures where found in the binary.
	ErrNoValidSignatures = errors.New("binary has no valid signatures")
)

Functions

func CreateSpcIndirectDataContent

func CreateSpcIndirectDataContent(digest []byte, alg crypto.Hash) ([]byte, error)

CreateSpcIndirectDataContent creates the SPCIndirectDataContent container as specified int he Authenticode standard.

func Padding

func Padding(src []byte, blockSize int) []byte

func PaddingBytes

func PaddingBytes(srcLen, blockSize int) ([]byte, int)

func SignAuthenticode

func SignAuthenticode(signer crypto.Signer, cert *x509.Certificate, digest []byte, alg crypto.Hash) ([]byte, error)

SignAuthenticode signs a digest with the SPC Indirect Data Content as specified by the authenticode standard.

Types

type Authenticode

type Authenticode struct {
	Pkcs   *pkcs7.PKCS7
	Algid  *pkix.AlgorithmIdentifier
	Digest []byte
}

Authenticode represents an authenticode signature.

func ParseAuthenticode

func ParseAuthenticode(b []byte) (*Authenticode, error)

ParseAuthenticode parses an Authenticode signature.

func (*Authenticode) Verify

func (a *Authenticode) Verify(cert *x509.Certificate, img []byte) (bool, error)

Verify validates an authenticode signature. Note it doesn't validate x509 certificate chains.

type PECOFFBinary

type PECOFFBinary struct {
	// DataDirectory for the Certificate table
	Datadir pe.DataDirectory
	// Reader with the hashable bytes
	HashContent *bytes.Buffer
	// contains filtered or unexported fields
}

PECOFFBinary represents a parsed PE/COFF binary.

func Parse

func Parse(r io.ReaderAt) (*PECOFFBinary, error)

Parse a PECOFF Binary. This will read the binary and collect all the bytes we are hashing.

func (*PECOFFBinary) AppendSignature

func (p *PECOFFBinary) AppendSignature(sig []byte) error

Append an signature to the file.

func (*PECOFFBinary) Bytes

func (p *PECOFFBinary) Bytes() []byte

Return the binary with any appended signatures

func (*PECOFFBinary) Hash

func (p *PECOFFBinary) Hash(h crypto.Hash) []byte

Hash makes a hash of the HashContent bytes.

func (*PECOFFBinary) Sign

func (p *PECOFFBinary) Sign(key crypto.Signer, cert *x509.Certificate) ([]byte, error)

Sign the PE/COFF binary and return the signature. .Bytes() will return the binary with the signature appended.

func (*PECOFFBinary) Signatures

func (p *PECOFFBinary) Signatures() ([]*signature.WINCertificate, error)

Signatures returns a slice of *signature.WINCertificate which contains the WINCert wrapped Authenticode signatures.

func (*PECOFFBinary) Verify

func (p *PECOFFBinary) Verify(cert *x509.Certificate) (bool, error)

Verify signature