forked from zmap/zgrab
/
handshake_export.go
55 lines (48 loc) · 1.05 KB
/
handshake_export.go
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package ztls
type rsaExportParams struct {
modulusLength uint16
rawModulus []byte
exponentLength uint16
rawExponent []byte
raw []byte
}
func (p *rsaExportParams) unmarshal(data []byte) bool {
p.raw = data
// Read out modulusLength
if len(data) < 2 {
return false
}
modulusLength := int(data[0])<<8 | int(data[1])
if modulusLength < 0 || modulusLength > 65535 {
return false
}
p.modulusLength = uint16(modulusLength)
// Move forward
data = data[2:]
if len(data) < modulusLength {
return false
}
// Pull out raw modulus
p.rawModulus = data[0:modulusLength]
data = data[modulusLength:]
// Pull out exponent length
if len(data) < 2 {
return false
}
exponentLength := int(data[0])<<8 | int(data[1])
if exponentLength < 0 || exponentLength > 65535 {
return false
}
p.exponentLength = uint16(exponentLength)
if exponentLength > 4 {
return false
}
// Pull out exponent
data = data[2:]
if len(data) < exponentLength {
return false
}
p.rawExponent = data[0:exponentLength]
data = data[exponentLength:]
return true
}