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Add additional errors for Decode (#4)

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Co-authored-by: Knut Ahlers <knut@ahlers.me>
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brent s. 2024-09-20 03:55:10 -04:00 committed by GitHub
parent 348aee6368
commit a42823ee10
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1 changed files with 14 additions and 0 deletions
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14
dh.go
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@ -4,10 +4,17 @@ import (
"bytes" "bytes"
"encoding/asn1" "encoding/asn1"
"encoding/pem" "encoding/pem"
"errors"
"fmt" "fmt"
"math/big" "math/big"
) )
// ErrNoPem is returned if pemData for the Decode function is nil or empty.
var ErrNoPem = errors.New("empty or nil bytes for PEM data")
// ErrInvalidPem is returned if pemData for the Decode function does not seem to be PEM-encoded data.
var ErrInvalidPem = errors.New("invalid bytes for PEM data; does not seem to be PEM-encoded")
// DH contains a prime (P) and a generator (G) number representing the DH parameters // DH contains a prime (P) and a generator (G) number representing the DH parameters
type DH struct { type DH struct {
P *big.Int P *big.Int
@ -16,7 +23,14 @@ type DH struct {
// Decode reads a DH parameters struct from its PEM data // Decode reads a DH parameters struct from its PEM data
func Decode(pemData []byte) (*DH, error) { func Decode(pemData []byte) (*DH, error) {
if pemData == nil || len(pemData) == 0 {
return nil, ErrNoPem
}
blk, _ := pem.Decode(pemData) blk, _ := pem.Decode(pemData)
if blk == nil {
return nil, ErrInvalidPem
}
out := &DH{} out := &DH{}
if _, err := asn1.Unmarshal(blk.Bytes, out); err != nil { if _, err := asn1.Unmarshal(blk.Bytes, out); err != nil {