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-rw-r--r--sms-service/src/sms/auth/auth.go36
1 files changed, 36 insertions, 0 deletions
diff --git a/sms-service/src/sms/auth/auth.go b/sms-service/src/sms/auth/auth.go
index 341f377..ad5afdc 100644
--- a/sms-service/src/sms/auth/auth.go
+++ b/sms-service/src/sms/auth/auth.go
@@ -22,6 +22,7 @@ import (
"crypto/x509"
"encoding/base64"
"golang.org/x/crypto/openpgp"
+ "golang.org/x/crypto/openpgp/packet"
"io/ioutil"
smslogger "sms/log"
@@ -93,3 +94,38 @@ func GeneratePGPKeyPair() (string, string, error) {
return pbkey, prkey, nil
}
+
+// DecryptPGPBytes decrypts a PGP encoded input string and returns
+// a base64 representation of the decoded string
+func DecryptPGPBytes(data string, prKey string) (string, error) {
+ // Convert private key to bytes from base64
+ prKeyBytes, err := base64.StdEncoding.DecodeString(prKey)
+ if err != nil {
+ smslogger.WriteError("Error Decoding base64 private key: " + err.Error())
+ return "", err
+ }
+
+ dataBytes, err := base64.StdEncoding.DecodeString(data)
+ if err != nil {
+ smslogger.WriteError("Error Decoding base64 data: " + err.Error())
+ return "", err
+ }
+
+ prEntity, err := openpgp.ReadEntity(packet.NewReader(bytes.NewBuffer(prKeyBytes)))
+ if err != nil {
+ smslogger.WriteError("Error reading entity from PGP key: " + err.Error())
+ return "", err
+ }
+
+ prEntityList := &openpgp.EntityList{prEntity}
+ message, err := openpgp.ReadMessage(bytes.NewBuffer(dataBytes), prEntityList, nil, nil)
+ if err != nil {
+ smslogger.WriteError("Error Decrypting message: " + err.Error())
+ return "", err
+ }
+
+ var retBuf bytes.Buffer
+ retBuf.ReadFrom(message.UnverifiedBody)
+
+ return retBuf.String(), nil
+}