diff --git a/crypto/block-luks.c b/crypto/block-luks.c
index 353a400595..e486e7ee94 100644
--- a/crypto/block-luks.c
+++ b/crypto/block-luks.c
@@ -1409,10 +1409,9 @@ qcrypto_block_luks_decrypt(QCryptoBlock *block,
 {
     assert(QEMU_IS_ALIGNED(offset, QCRYPTO_BLOCK_LUKS_SECTOR_SIZE));
     assert(QEMU_IS_ALIGNED(len, QCRYPTO_BLOCK_LUKS_SECTOR_SIZE));
-    return qcrypto_block_cipher_decrypt_helper(block->cipher,
-                                               block->niv, block->ivgen,
-                                               QCRYPTO_BLOCK_LUKS_SECTOR_SIZE,
-                                               offset, buf, len, errp);
+    return qcrypto_block_decrypt_helper(block,
+                                        QCRYPTO_BLOCK_LUKS_SECTOR_SIZE,
+                                        offset, buf, len, errp);
 }
 
 
@@ -1425,10 +1424,9 @@ qcrypto_block_luks_encrypt(QCryptoBlock *block,
 {
     assert(QEMU_IS_ALIGNED(offset, QCRYPTO_BLOCK_LUKS_SECTOR_SIZE));
     assert(QEMU_IS_ALIGNED(len, QCRYPTO_BLOCK_LUKS_SECTOR_SIZE));
-    return qcrypto_block_cipher_encrypt_helper(block->cipher,
-                                               block->niv, block->ivgen,
-                                               QCRYPTO_BLOCK_LUKS_SECTOR_SIZE,
-                                               offset, buf, len, errp);
+    return qcrypto_block_encrypt_helper(block,
+                                        QCRYPTO_BLOCK_LUKS_SECTOR_SIZE,
+                                        offset, buf, len, errp);
 }
 
 
diff --git a/crypto/block-qcow.c b/crypto/block-qcow.c
index 3b6722deb0..36bf5f09b7 100644
--- a/crypto/block-qcow.c
+++ b/crypto/block-qcow.c
@@ -152,10 +152,9 @@ qcrypto_block_qcow_decrypt(QCryptoBlock *block,
 {
     assert(QEMU_IS_ALIGNED(offset, QCRYPTO_BLOCK_QCOW_SECTOR_SIZE));
     assert(QEMU_IS_ALIGNED(len, QCRYPTO_BLOCK_QCOW_SECTOR_SIZE));
-    return qcrypto_block_cipher_decrypt_helper(block->cipher,
-                                               block->niv, block->ivgen,
-                                               QCRYPTO_BLOCK_QCOW_SECTOR_SIZE,
-                                               offset, buf, len, errp);
+    return qcrypto_block_decrypt_helper(block,
+                                        QCRYPTO_BLOCK_QCOW_SECTOR_SIZE,
+                                        offset, buf, len, errp);
 }
 
 
@@ -168,10 +167,9 @@ qcrypto_block_qcow_encrypt(QCryptoBlock *block,
 {
     assert(QEMU_IS_ALIGNED(offset, QCRYPTO_BLOCK_QCOW_SECTOR_SIZE));
     assert(QEMU_IS_ALIGNED(len, QCRYPTO_BLOCK_QCOW_SECTOR_SIZE));
-    return qcrypto_block_cipher_encrypt_helper(block->cipher,
-                                               block->niv, block->ivgen,
-                                               QCRYPTO_BLOCK_QCOW_SECTOR_SIZE,
-                                               offset, buf, len, errp);
+    return qcrypto_block_encrypt_helper(block,
+                                        QCRYPTO_BLOCK_QCOW_SECTOR_SIZE,
+                                        offset, buf, len, errp);
 }
 
 
diff --git a/crypto/block.c b/crypto/block.c
index d43139dbc7..3fe3de2ef8 100644
--- a/crypto/block.c
+++ b/crypto/block.c
@@ -277,3 +277,31 @@ int qcrypto_block_cipher_encrypt_helper(QCryptoCipher *cipher,
                                           offset, buf, len,
                                           qcrypto_cipher_encrypt, errp);
 }
+
+
+int qcrypto_block_decrypt_helper(QCryptoBlock *block,
+                                 int sectorsize,
+                                 uint64_t offset,
+                                 uint8_t *buf,
+                                 size_t len,
+                                 Error **errp)
+{
+    return do_qcrypto_block_cipher_encdec(block->cipher, block->niv,
+                                          block->ivgen,
+                                          sectorsize, offset, buf, len,
+                                          qcrypto_cipher_decrypt, errp);
+}
+
+
+int qcrypto_block_encrypt_helper(QCryptoBlock *block,
+                                 int sectorsize,
+                                 uint64_t offset,
+                                 uint8_t *buf,
+                                 size_t len,
+                                 Error **errp)
+{
+    return do_qcrypto_block_cipher_encdec(block->cipher, block->niv,
+                                          block->ivgen,
+                                          sectorsize, offset, buf, len,
+                                          qcrypto_cipher_encrypt, errp);
+}
diff --git a/crypto/blockpriv.h b/crypto/blockpriv.h
index 54bbe1eb6a..438c08bec2 100644
--- a/crypto/blockpriv.h
+++ b/crypto/blockpriv.h
@@ -96,4 +96,18 @@ int qcrypto_block_cipher_encrypt_helper(QCryptoCipher *cipher,
                                         size_t len,
                                         Error **errp);
 
+int qcrypto_block_decrypt_helper(QCryptoBlock *block,
+                                 int sectorsize,
+                                 uint64_t offset,
+                                 uint8_t *buf,
+                                 size_t len,
+                                 Error **errp);
+
+int qcrypto_block_encrypt_helper(QCryptoBlock *block,
+                                 int sectorsize,
+                                 uint64_t offset,
+                                 uint8_t *buf,
+                                 size_t len,
+                                 Error **errp);
+
 #endif /* QCRYPTO_BLOCKPRIV_H */