Smart patching

btls/README.md

@@ -0,0 +1,33 @@
+# OpenSSL patching
+
+There are two patching methods available:
+1. Using a patch generated by git diff.
+2. Using a slightly smarter patch that doesn't depend on line numbers and can be 
+applied to different versions of openssl.
+
+## Option 1
+
+Can only be used for **OpenSSL_1_1_1i** version .
+
+## Option 2
+
+| version | test results |
+| :--- | :---: |
+| OpenSSL_1_1_1i | :heavy_check_mark:      |
+| OpenSSL_1_1_1j | :heavy_check_mark:      |
+| OpenSSL_1_1_1k | :heavy_check_mark:      |
+| OpenSSL_1_1_1l | :heavy_check_mark:      |
+| OpenSSL_1_1_1m | :heavy_check_mark:      |
+| OpenSSL_1_1_1n | :heavy_multiplication_x: (see [issue](https://github.com/bcrypto/bee2evp/issues/11#issue-1179528056))|
+
+## Build script
+
+Run script build.sh. Usage:
+```text
+"Script for patching OpenSSL."
+
+"Syntax: build [-v|m]"
+   "options:"
+   "v     OpenSSL version"
+   "m     Mode: 0 (simple patching) or 1 (smart patching)"
+```