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lib.go
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lib.go
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package canopusgo
import (
"crypto"
"crypto/rsa"
"crypto/sha256"
"crypto/x509"
"encoding/base64"
"encoding/json"
"encoding/pem"
"errors"
)
func ValidateResponse(resp []byte) (CommonMessage, error) {
var response CommonMessage
var err error
err = json.Unmarshal(resp, &response)
if err != nil {
return CommonMessage{}, err
}
if response.Response.Result.Code != "00000000" {
err = errors.New(response.Response.Result.Code + " " + response.Response.Result.Message)
return CommonMessage{}, err
}
return response, nil
}
func VerifySignature(merchantPem []byte, response []byte, signature string) (bool, error) {
block, _ := pem.Decode(merchantPem)
if block == nil {
return false, errors.New("failed to decode merchantPem")
}
pubkey, err := x509.ParsePKCS1PublicKey(block.Bytes)
if err != nil {
return false, err
}
sDec, err := base64.StdEncoding.DecodeString(signature)
if err != nil {
return false, err
}
hashed := sha256.Sum256(response)
err = rsa.VerifyPKCS1v15(pubkey, crypto.SHA256, hashed[:], sDec)
if err != nil {
return false, err
}
return true, nil
}