diff --git a/crypto.go b/crypto.go
index cc2f92e..8fc355d 100644
--- a/crypto.go
+++ b/crypto.go
@@ -1,6 +1,7 @@
 package service
 
 import (
+	"crypto"
 	cipher2 "crypto/cipher"
 	"crypto/rand"
 	"crypto/rsa"
@@ -68,7 +69,7 @@ func DecryptAndVerify(input []byte, key *rsa.PrivateKey, pub *rsa.PublicKey, sig
 
 	fingerprint := signature
 	fingerprintHashed := sha256.Sum256(fingerprint)
-	err = rsa.VerifyPKCS1v15(pub, 0, fingerprintHashed[:], recvSignature)
+	err = rsa.VerifyPKCS1v15(pub, crypto.SHA256, fingerprintHashed[:], recvSignature)
 	return err
 }
 
@@ -98,7 +99,7 @@ func EncryptAndSign(v Message, key *rsa.PrivateKey, pub *rsa.PublicKey, signatur
 	}
 
 	hashedFingerpint := sha256.Sum256(signature)
-	plainSignature, err := rsa.SignPKCS1v15(rand.Reader, key, 0, hashedFingerpint[:])
+	plainSignature, err := rsa.SignPKCS1v15(rand.Reader, key, crypto.SHA256, hashedFingerpint[:])
 	if err != nil {
 		return err
 	}