ASN1 length long length issue.

[Adamhingoro]

ASN1 has 2 implementations for the data length.

• short ( < 127 )
• long ( > 127 )

then the IE value length is greater than 127 it still encodes/decodes the length in the shorter implementation thus not able to communicate with any other ASN1 service.

[wmnsk]

Thanks. Could you point out which code exactly causes the problem?

[Adamhingoro]

In almost all interfaces of the UnmarshalBinary and MarshalTo functions.
You have used 2 by default of length attribute.

but for longer ASN it could be different.

[anilk247]

func (t *Transaction) UnmarshalBinary(b []byte) error {
t.Type = Tag(b[0])
t.Length = b[1]

var err error
var offset = 2

.....

Above is the one of the places where it needs to be fixed. Got it fixed locally like below

func (t *Transaction) UnmarshalBinary(b []byte) error {

var err error
var offset = 2

t.Type = Tag(b[0])
if b[1] & 0x80 == 0 {
    t.Length = b[1]
} else {
   lenOfLen =  b[1] & 0x0f
   offset += lenOfLen
   t.Length = byteSlice2Int (b[2:2+ lenOfLen]
}

.....

func byteSlice2Int(data []byte) int {

exp := float64(len(data) - 1)
var i, res int

for i = 0; i < len(data); i = i + 1 {
    res = res + int((math.Exp2(8*exp) * float64(data[i])))
    exp = exp - 1
}

return res

}