Moved EIP712 filtering related code into its own file

2022-07-05 14:38:04 +02:00
parent cd77ca5152
commit 399b865e5c
5 changed files with 282 additions and 242 deletions
--- a/src_features/signMessageEIP712/schema_hash.c
+++ b/src_features/signMessageEIP712/schema_hash.c
@@ -0,0 +1,66 @@
+#ifdef HAVE_EIP712_FULL_SUPPORT
+
+#include "schema_hash.h"
+#include "hash_bytes.h"
+#include "typed_data.h"
+#include "format_hash_field_type.h"
+#include "context.h"
+
+bool    compute_schema_hash(void)
+{
+    const void *struct_ptr;
+    uint8_t structs_count;
+    const void *field_ptr;
+    uint8_t fields_count;
+    const char *name;
+    uint8_t name_length;
+    cx_sha256_t hash_ctx; // sha224
+
+    cx_sha224_init(&hash_ctx);
+
+    struct_ptr = get_structs_array(eip712_context->structs_array, &structs_count);
+    hash_byte('{', (cx_hash_t*)&hash_ctx);
+    while (structs_count-- > 0)
+    {
+        name = get_struct_name(struct_ptr, &name_length);
+        hash_byte('"', (cx_hash_t*)&hash_ctx);
+        hash_nbytes((uint8_t*)name, name_length, (cx_hash_t*)&hash_ctx);
+        hash_nbytes((uint8_t*)"\":[", 3, (cx_hash_t*)&hash_ctx);
+        field_ptr = get_struct_fields_array(struct_ptr, &fields_count);
+        while (fields_count-- > 0)
+        {
+            hash_nbytes((uint8_t*)"{\"name\":\"", 9, (cx_hash_t*)&hash_ctx);
+            name = get_struct_field_keyname(field_ptr, &name_length);
+            hash_nbytes((uint8_t*)name, name_length, (cx_hash_t*)&hash_ctx);
+            hash_nbytes((uint8_t*)"\",\"type\":\"", 10, (cx_hash_t*)&hash_ctx);
+            if (!format_hash_field_type(field_ptr, (cx_hash_t*)&hash_ctx))
+            {
+                return false;
+            }
+            hash_nbytes((uint8_t*)"\"}", 2, (cx_hash_t*)&hash_ctx);
+            if (fields_count > 0)
+            {
+                hash_byte(',', (cx_hash_t*)&hash_ctx);
+            }
+            field_ptr = get_next_struct_field(field_ptr);
+        }
+        hash_byte(']', (cx_hash_t*)&hash_ctx);
+        if (structs_count > 0)
+        {
+            hash_byte(',', (cx_hash_t*)&hash_ctx);
+        }
+        struct_ptr = get_next_struct(struct_ptr);
+    }
+    hash_byte('}', (cx_hash_t*)&hash_ctx);
+
+    // copy hash into context struct
+    cx_hash((cx_hash_t*)&hash_ctx,
+            CX_LAST,
+            NULL,
+            0,
+            eip712_context->schema_hash,
+            sizeof(eip712_context->schema_hash));
+    return true;
+}
+
+#endif // HAVE_EIP712_FULL_SUPPORT