diff --git a/include/dnssec_tests.hrl b/include/dnssec_tests.hrl
index fb3e187..a49481b 100644
--- a/include/dnssec_tests.hrl
+++ b/include/dnssec_tests.hrl
@@ -218,9 +218,8 @@ test_sample_key(dsa, PrivKey, PubKey) ->
     crypto:verify(dss, sha, Sample, Sig, PubKey);
 test_sample_key(rsa, PrivKey, PubKey) ->
     Sample = <<"1234">>,
-    Signature = crypto:sign(rsa, sha, Sample, PrivKey, [{rsa_padding, rsa_pkcs1_padding}]),
-    crypto:verify(rsa, sha, Sample, Signature, PubKey, [{rsa_padding, rsa_pkcs1_padding}]).
-
+    Cipher = crypto:sign(rsa, none, Sample, PrivKey, [{rsa_padding, rsa_pkcs1_padding}]),
+    true =:= crypto:verify(rsa, none, Sample, Cipher, PubKey, [{rsa_padding, rsa_pkcs1_padding}]).
 
 dnskey_pubkey_gen_test_() ->
     [
diff --git a/src/dnssec.erl b/src/dnssec.erl
index 1c9a195..e886663 100644
--- a/src/dnssec.erl
+++ b/src/dnssec.erl
@@ -420,7 +420,7 @@ sign_rrset(
             ->
                 crypto:sign(
                     rsa,
-                    dns_algo_to_digest_type(Alg),
+                    none,
                     BaseSigInput,
                     Key,
                     [{rsa_padding, rsa_pkcs1_padding}]
@@ -505,7 +505,12 @@ verify_rrsig(
                     ->
                         try
                             crypto:verify(
-                                rsa, dns_algo_to_digest_type(Alg), SigInput, Sig, Key, [{rsa_padding, rsa_pkcs1_padding}]
+                                rsa,
+                                none,
+                                SigInput,
+                                Sig,
+                                Key,
+                                [{rsa_padding, rsa_pkcs1_padding}]
                             )
                         catch
                             error:decrypt_failed -> undefined
@@ -517,11 +522,6 @@ verify_rrsig(
             )
     end.
 
-dns_algo_to_digest_type(?DNS_ALG_NSEC3RSASHA1) -> sha;
-dns_algo_to_digest_type(?DNS_ALG_RSASHA1) -> sha;
-dns_algo_to_digest_type(?DNS_ALG_RSASHA256) -> sha256;
-dns_algo_to_digest_type(?DNS_ALG_RSASHA512) -> sha512.
-
 build_sig_input(
     SignersName,
     KeyTag,