first commit

2026-09-14 23:22:10 +09:00
commit 9f9c8fb69b
4207 changed files with 1333187 additions and 0 deletions
@@ -0,0 +1,41 @@
+from Crypto.Util._raw_api import (load_pycryptodome_raw_lib, c_size_t,
+                                  c_uint8_ptr)
+
+
+_raw_pkcs1_decode = load_pycryptodome_raw_lib("Crypto.Cipher._pkcs1_decode",
+                        """
+                        int pkcs1_decode(const uint8_t *em, size_t len_em,
+                                         const uint8_t *sentinel, size_t len_sentinel,
+                                         size_t expected_pt_len,
+                                         uint8_t *output);
+
+                        int oaep_decode(const uint8_t *em,
+                                        size_t em_len,
+                                        const uint8_t *lHash,
+                                        size_t hLen,
+                                        const uint8_t *db,
+                                        size_t db_len);
+                        """)
+
+
+def pkcs1_decode(em, sentinel, expected_pt_len, output):
+    if len(em) != len(output):
+        raise ValueError("Incorrect output length")
+
+    ret = _raw_pkcs1_decode.pkcs1_decode(c_uint8_ptr(em),
+                                         c_size_t(len(em)),
+                                         c_uint8_ptr(sentinel),
+                                         c_size_t(len(sentinel)),
+                                         c_size_t(expected_pt_len),
+                                         c_uint8_ptr(output))
+    return ret
+
+
+def oaep_decode(em, lHash, db):
+    ret = _raw_pkcs1_decode.oaep_decode(c_uint8_ptr(em),
+                                        c_size_t(len(em)),
+                                        c_uint8_ptr(lHash),
+                                        c_size_t(len(lHash)),
+                                        c_uint8_ptr(db),
+                                        c_size_t(len(db)))
+    return ret