diff --git a/boot/bootutil/src/image_ed25519.c b/boot/bootutil/src/image_ed25519.c
index 40d494bcf..93fd5de88 100644
--- a/boot/bootutil/src/image_ed25519.c
+++ b/boot/bootutil/src/image_ed25519.c
@@ -26,16 +26,18 @@
 
 #define EDDSA_SIGNATURE_LENGTH 64
 
-static const uint8_t ed25519_pubkey_oid[] = MBEDTLS_OID_ISO_IDENTIFIED_ORG "\x65\x70";
 #define NUM_ED25519_BYTES 32
 
 extern int ED25519_verify(const uint8_t *message, size_t message_len,
                           const uint8_t signature[EDDSA_SIGNATURE_LENGTH],
                           const uint8_t public_key[NUM_ED25519_BYTES]);
 
+#if !defined(MCUBOOT_KEY_IMPORT_BYPASS_ASN)
 /*
  * Parse the public key used for signing.
  */
+static const uint8_t ed25519_pubkey_oid[] = MBEDTLS_OID_ISO_IDENTIFIED_ORG "\x65\x70";
+
 static int
 bootutil_import_key(uint8_t **cp, uint8_t *end)
 {
@@ -71,6 +73,7 @@ bootutil_import_key(uint8_t **cp, uint8_t *end)
 
     return 0;
 }
+#endif /* !defined(MCUBOOT_KEY_IMPORT_BYPASS_ASN) */
 
 fih_ret
 bootutil_verify_sig(uint8_t *hash, uint32_t hlen, uint8_t *sig, size_t slen,
@@ -89,11 +92,25 @@ bootutil_verify_sig(uint8_t *hash, uint32_t hlen, uint8_t *sig, size_t slen,
     pubkey = (uint8_t *)bootutil_keys[key_id].key;
     end = pubkey + *bootutil_keys[key_id].len;
 
+#if !defined(MCUBOOT_KEY_IMPORT_BYPASS_ASN)
     rc = bootutil_import_key(&pubkey, end);
     if (rc) {
         FIH_SET(fih_rc, FIH_FAILURE);
         goto out;
     }
+#else
+    /* Directly use the key contents from the ASN stream,
+     * these are the last NUM_ED25519_BYTES.
+     * There is no check whether this is the correct key,
+     * here, by the algorithm selected.
+     */
+    if (*bootutil_keys[key_id].len < NUM_ED25519_BYTES) {
+        FIH_SET(fih_rc, FIH_FAILURE);
+        goto out;
+    }
+
+    pubkey = end - NUM_ED25519_BYTES;
+#endif
 
     rc = ED25519_verify(hash, IMAGE_HASH_SIZE, sig, pubkey);
 
diff --git a/boot/zephyr/include/mcuboot_config/mcuboot_config.h b/boot/zephyr/include/mcuboot_config/mcuboot_config.h
index 7896e0939..bc5188138 100644
--- a/boot/zephyr/include/mcuboot_config/mcuboot_config.h
+++ b/boot/zephyr/include/mcuboot_config/mcuboot_config.h
@@ -34,6 +34,10 @@
 #     error "One crypto library implementation allowed at a time."
 #endif
 
+#if defined(CONFIG_BOOT_KEY_IMPORT_BYPASS_ASN)
+#define MCUBOOT_KEY_IMPORT_BYPASS_ASN
+#endif
+
 #ifdef CONFIG_BOOT_USE_MBEDTLS
 #define MCUBOOT_USE_MBED_TLS
 #elif defined(CONFIG_BOOT_USE_TINYCRYPT)