diff --git a/fusee/fusee-secondary/src/package1.c b/fusee/fusee-secondary/src/package1.c
new file mode 100644
index 000000000..44e7c5dbb
--- /dev/null
+++ b/fusee/fusee-secondary/src/package1.c
@@ -0,0 +1,64 @@
+#include <errno.h>
+#include <stdlib.h>
+#include "package1.h"
+#include "bct.h"
+
+int package1_parse_boot0(void **package1, size_t *package1_size, nx_keyblob_t *keyblobs, uint32_t *version, FILE *boot0) {
+    static nvboot_config_table bct = {0}; /* Normal firmware BCT, primary. TODO: check? */
+    nv_bootloader_info *pk1_info = &bct.bootloader[0]; /* TODO: check? */
+
+    size_t fpos, pk1_offset;
+
+    if (package1 == NULL || package1_size != NULL || keyblobs == NULL || version == NULL || boot0 == NULL) {
+        errno = EINVAL;
+        return -1;
+    }
+
+    fpos = ftell(boot0);
+
+    /* Read the BCT. */
+    if (fread(&bct, sizeof(nvboot_config_table), 1, boot0) == 0) {
+        return -1;
+    }
+    if (bct.bootloader_used < 1) {
+        errno = EILSEQ;
+        return -1;
+    }
+
+    *version = pk1_info->attribute;
+    *package1_size = pk1_info->length;
+
+    pk1_offset = 0x4000 * pk1_info->start_blk + 0x200 * pk1_info->start_page;
+
+    (*package1) = malloc(*package1_size);
+
+    if (*package1 == NULL) {
+        errno = ENOMEM;
+        return -1;
+    }
+
+    /* Read the pk1/pk1l. */
+    if (fseek(boot0, fpos + pk1_offset, SEEK_SET) != 0) {
+        return -1;
+    }
+    if (fread(*package1, *package1_size, 1, boot0) == 0) {
+        return -1;
+    }
+
+    /* Skip the backup pk1/pk1l. */
+    if (fseek(boot0, *package1_size, SEEK_CUR) != 0) {
+        return -1;
+    }
+
+    /* Read the full keyblob area.*/
+    for (size_t i = 0; i < 32; i++) {
+        if (fread(&keyblobs[i], sizeof(nx_keyblob_t), 1, boot0) == 0) {
+            return -1;
+        }
+        if (fseek(boot0, 0x200 - sizeof(nx_keyblob_t), SEEK_CUR)) {
+            return -1;
+        }
+    }
+
+    return 0;
+}
diff --git a/fusee/fusee-secondary/src/package1.h b/fusee/fusee-secondary/src/package1.h
new file mode 100644
index 000000000..cdd18183c
--- /dev/null
+++ b/fusee/fusee-secondary/src/package1.h
@@ -0,0 +1,9 @@
+#ifndef FUSEE_PACKAGE1_H
+#define FUSEE_PACKAGE1_H
+
+#include <stdio.h>
+#include "key_derivation.h"
+
+int package1_parse_boot0(void **package1, size_t *package1_size, nx_keyblob_t *keyblobs, uint32_t *version, FILE *boot0);
+
+#endif