diff --git a/crypto/hash-gcrypt.c b/crypto/hash-gcrypt.c
index ed6f842461..7690690f70 100644
--- a/crypto/hash-gcrypt.c
+++ b/crypto/hash-gcrypt.c
@@ -55,8 +55,7 @@ int qcrypto_hash_bytesv(QCryptoHashAlgorithm alg,
     gcry_md_hd_t md;
     unsigned char *digest;
 
-    if (alg >= G_N_ELEMENTS(qcrypto_hash_alg_map) ||
-        qcrypto_hash_alg_map[alg] == GCRY_MD_NONE) {
+    if (!qcrypto_hash_supports(alg)) {
         error_setg(errp,
                    "Unknown hash algorithm %d",
                    alg);
diff --git a/crypto/hash-glib.c b/crypto/hash-glib.c
index cb68a3b0d7..ec99ac9df9 100644
--- a/crypto/hash-glib.c
+++ b/crypto/hash-glib.c
@@ -57,8 +57,7 @@ int qcrypto_hash_bytesv(QCryptoHashAlgorithm alg,
     int i, ret;
     GChecksum *cs;
 
-    if (alg >= G_N_ELEMENTS(qcrypto_hash_alg_map) ||
-        qcrypto_hash_alg_map[alg] == -1) {
+    if (!qcrypto_hash_supports(alg)) {
         error_setg(errp,
                    "Unknown hash algorithm %d",
                    alg);
diff --git a/crypto/hash-nettle.c b/crypto/hash-nettle.c
index 4c6f50b65d..6a206dcb18 100644
--- a/crypto/hash-nettle.c
+++ b/crypto/hash-nettle.c
@@ -113,8 +113,7 @@ int qcrypto_hash_bytesv(QCryptoHashAlgorithm alg,
     int i;
     union qcrypto_hash_ctx ctx;
 
-    if (alg >= G_N_ELEMENTS(qcrypto_hash_alg_map) ||
-        qcrypto_hash_alg_map[alg].init == NULL) {
+    if (!qcrypto_hash_supports(alg)) {
         error_setg(errp,
                    "Unknown hash algorithm %d",
                    alg);