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more lease set work, certificate completed

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This commit is contained in:
Hayden Parker
2016-02-14 22:28:20 -08:00
parent a64fe87dbe
commit e19d6fa0ab
5 changed files with 190 additions and 63 deletions
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123
lib/common/certificate.go
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@ -1,7 +1,34 @@
package common
/*
I2P Certificate
https://geti2p.net/en/docs/spec/common-structures#type_Certificate
Accurate for version 0.9.24
+----+----+----+----+----+-//
|type| length | payload
+----+----+----+----+----+-//
type :: Integer
length -> 1 byte
case 0 -> NULL
case 1 -> HASHCASH
case 2 -> HIDDEN
case 3 -> SIGNED
case 4 -> MULTIPLE
case 5 -> KEY
length :: Integer
length -> 2 bytes
payload :: data
length -> $length bytes
*/
import (
"errors"
log "github.com/Sirupsen/logrus"
)
// Certificate Types
@ -14,11 +41,24 @@ const (
CERT_KEY
)
const (
CERT_MIN_LENGTH = 3
)
type Certificate []byte
//
// Return the Certificate Type specified in the first byte of the Certificate,
// and an error if the certificate is shorter than the minimum certificate size.
//
func (certificate Certificate) Type() (cert_type int, err error) {
if len(certificate) < 1 {
err = errors.New("")
cert_len := len(certificate)
if cert_len < CERT_MIN_LENGTH {
log.WithFields(log.Fields{
"certificate_bytes_length": cert_len,
"reason": "too short (len < CERT_MIN_LENGTH)",
}).Error("invalid certificate")
err = errors.New("error parsing certificate length: certificate is too short")
return
}
cert_type = Integer([]byte{certificate[0]})
@ -26,63 +66,70 @@ func (certificate Certificate) Type() (cert_type int, err error) {
}
//
// Look up the length of the certificate, reporting
// errors if the certificate is invalid or the specified
// length does not match the provided data.
// Look up the length of the Certificate, reporting errors if the certificate is
// shorter than the minimum certificate size or if the reported length doesn't
// match the provided data.
//
func (certificate Certificate) Length() (int, error) {
if len(certificate) < 3 {
// log
return 0, errors.New("error parsing certificate length: certificate is too short")
}
length := Integer(certificate[1:3])
inferred_len := length + 3
func (certificate Certificate) Length() (length int, err error) {
cert_len := len(certificate)
_, err = certificate.Type()
if err != nil {
return
}
length = Integer(certificate[1:CERT_MIN_LENGTH])
inferred_len := length + CERT_MIN_LENGTH
if inferred_len > cert_len {
// log
return length, errors.New("certificate parsing warning: certificate data is shorter than specified by length")
log.WithFields(log.Fields{
"certificate_bytes_length": cert_len,
"certificate_length_field": length,
"expected_bytes_length": inferred_len,
"reason": "data shorter than specified",
}).Warn("certificate format warning")
err = errors.New("certificate parsing warning: certificate data is shorter than specified by length")
} else if cert_len > inferred_len {
//log
return length, errors.New("certificate parsing warning: certificate contains data beyond length")
log.WithFields(log.Fields{
"certificate_bytes_length": cert_len,
"certificate_length_field": length,
"expected_bytes_length": inferred_len,
"reason": "data longer than expected",
}).Error("certificate format warning")
err = errors.New("certificate parsing warning: certificate contains data beyond length")
}
return length, nil
return
}
//
// Return the certificate data and any errors
// encountered by Length.
// Return the Certificate data and any errors encountered parsing the Certificate.
//
func (certificate Certificate) Data() ([]byte, error) {
func (certificate Certificate) Data() (data []byte, err error) {
length, err := certificate.Length()
if err != nil {
switch err.Error() {
case "error parsing certificate length: certificate is too short":
return make([]byte, 0), err
return
case "certificate parsing warning: certificate data is shorter than specified by length":
return certificate[3:], err
data = certificate[CERT_MIN_LENGTH:]
return
case "certificate parsing warning: certificate contains data beyond length":
return certificate[3 : length+3], err
data = certificate[CERT_MIN_LENGTH : length+CERT_MIN_LENGTH]
return
}
}
return certificate[3:], nil
data = certificate[CERT_MIN_LENGTH:]
return
}
//
// Read a certificate from a slice of bytes, returning
// any extra data on the end of the slice.
// Read a Certificate from a slice of bytes, returning any extra data on the end of the slice
// and any errors if a valid Certificate could not be read.
//
func ReadCertificate(data []byte) (Certificate, []byte, error) {
certificate := Certificate(data)
func ReadCertificate(data []byte) (certificate Certificate, remainder []byte, err error) {
certificate = Certificate(data)
length, err := certificate.Length()
if err != nil {
switch err.Error() {
case "error parsing certificate length: certificate is too short":
return Certificate{}, make([]byte, 0), err
case "certificate parsing warning: certificate data is shorter than specified by length":
return certificate, make([]byte, 0), err
case "certificate parsing warning: certificate contains data beyond length":
return Certificate(certificate[:length+3]), certificate[length+3:], nil
}
if err != nil && err.Error() == "certificate parsing warning: certificate contains data beyond length" {
certificate = Certificate(data[:length+CERT_MIN_LENGTH])
remainder = data[length+CERT_MIN_LENGTH:]
err = nil
}
return certificate, make([]byte, 0), nil
return
}