diff --git a/stand/libsa/geli/geliboot_crypto.c b/stand/libsa/geli/geliboot_crypto.c
--- a/stand/libsa/geli/geliboot_crypto.c
+++ b/stand/libsa/geli/geliboot_crypto.c
@@ -42,7 +42,7 @@
 	cipherInstance cipher;
 	struct aes_xts_ctx xtsctx, *ctxp;
 	size_t xts_len;
-	int err, blks, i;
+	int err, blks;
 
 	switch (algo) {
 	case CRYPTO_AES_CBC:
@@ -85,16 +85,12 @@
 
 		switch (enc) {
 		case GELI_DECRYPT:
-			for (i = 0; i < datasize; i += AES_XTS_BLOCKSIZE) {
-				enc_xform_aes_xts.decrypt(ctxp, data + i,
-				    data + i);
-			}
+			enc_xform_aes_xts.decrypt_multi(ctxp, data, data,
+			    datasize);
 			break;
 		case GELI_ENCRYPT:
-			for (i = 0; i < datasize; i += AES_XTS_BLOCKSIZE) {
-				enc_xform_aes_xts.encrypt(ctxp, data + i,
-				    data + i);
-			}
+			enc_xform_aes_xts.encrypt_multi(ctxp, data, data,
+			    datasize);
 			break;
 		}
 		break;