rustcrypt_derive/
lib.rs

1use proc_macro::TokenStream;
2use quote::quote;
3use syn::{parse_macro_input, Data, DeriveInput, Fields, Ident, Type};
4
5#[proc_macro_derive(Obfuscate)]
6pub fn derive_obfuscate(input: TokenStream) -> TokenStream {
7    let input = parse_macro_input!(input as DeriveInput);
8    let name = &input.ident;
9    let vis = &input.vis;
10    let obf_name = Ident::new(&format!("Obfuscated{name}"), name.span());
11
12    let data = match &input.data {
13        Data::Struct(s) => s,
14        _ => panic!("Obfuscate can only be derived for structs"),
15    };
16
17    let fields = match &data.fields {
18        Fields::Named(fields) => &fields.named,
19        _ => panic!("Only named fields are supported"),
20    };
21
22    let obf_fields = fields.iter().map(|f| {
23        let name = &f.ident;
24        quote! { #name: (Vec<u8>, [u8; 12]) }
25    });
26
27    let clear_args = fields.iter().map(|f| {
28        let name = &f.ident;
29        let ty = match &f.ty {
30            Type::Path(p) if p.path.is_ident("String") => quote! { &str },
31            Type::Path(p) if p.path.is_ident("u32") => quote! { u32 },
32            Type::Path(p) if p.path.is_ident("u64") => quote! { u64 },
33            Type::Path(p) if p.path.is_ident("i32") => quote! { i32 },
34            Type::Path(p) if p.path.is_ident("i64") => quote! { i64 },
35            Type::Path(p) if p.path.is_ident("bool") => quote! { bool },
36            _ => quote! { &str },
37        };
38        quote! { #name: #ty }
39    });
40
41    let clear_encrypt = fields.iter().map(|f| {
42        let name = &f.ident;
43        match &f.ty {
44            Type::Path(p) if p.path.is_ident("String") => quote! {
45                #name: rustcrypt_core::encrypt_string(#name, &DEFAULT_KEY)
46            },
47            Type::Path(p) if p.path.is_ident("u32") => quote! {
48                #name: rustcrypt_core::encrypt_u32(*#name, &DEFAULT_KEY)
49            },
50            Type::Path(p) if p.path.is_ident("u64") => quote! {
51                #name: rustcrypt_core::encrypt_u64(*#name, &DEFAULT_KEY)
52            },
53            Type::Path(p) if p.path.is_ident("i32") => quote! {
54                #name: rustcrypt_core::encrypt_i32(*#name, &DEFAULT_KEY)
55            },
56            Type::Path(p) if p.path.is_ident("i64") => quote! {
57                #name: rustcrypt_core::encrypt_i64(*#name, &DEFAULT_KEY)
58            },
59            Type::Path(p) if p.path.is_ident("bool") => quote! {
60                #name: rustcrypt_core::encrypt_bool(*#name, &DEFAULT_KEY)
61            },
62            _ => quote! {
63                #name: rustcrypt_core::encrypt_string(#name, &DEFAULT_KEY)
64            },
65        }
66    });
67
68    let decrypt_fields = fields.iter().map(|f| {
69        let name = &f.ident;
70        match &f.ty {
71            Type::Path(p) if p.path.is_ident("String") => quote! {
72                #name: rustcrypt_core::decrypt_string(&self.#name.0, &self.#name.1, &DEFAULT_KEY)
73            },
74            Type::Path(p) if p.path.is_ident("u32") => quote! {
75                #name: rustcrypt_core::decrypt_u32(&self.#name.0, &self.#name.1, &DEFAULT_KEY)
76            },
77            Type::Path(p) if p.path.is_ident("u64") => quote! {
78                #name: rustcrypt_core::decrypt_u64(&self.#name.0, &self.#name.1, &DEFAULT_KEY)
79            },
80            Type::Path(p) if p.path.is_ident("i32") => quote! {
81                #name: rustcrypt_core::decrypt_i32(&self.#name.0, &self.#name.1, &DEFAULT_KEY)
82            },
83            Type::Path(p) if p.path.is_ident("i64") => quote! {
84                #name: rustcrypt_core::decrypt_i64(&self.#name.0, &self.#name.1, &DEFAULT_KEY)
85            },
86            Type::Path(p) if p.path.is_ident("bool") => quote! {
87                #name: rustcrypt_core::decrypt_bool(&self.#name.0, &self.#name.1, &DEFAULT_KEY)
88            },
89            _ => quote! {
90                #name: rustcrypt_core::decrypt_string(&self.#name.0, &self.#name.1, &DEFAULT_KEY)
91            },
92        }
93    });
94
95    let expanded = quote! {
96        use rustcrypt_core::DEFAULT_KEY;
97
98        #[derive(Clone)]
99        #vis struct #obf_name { #(#obf_fields),* }
100
101        impl #obf_name {
102            pub fn new_clear(#(#clear_args),*) -> Self { Self { #(#clear_encrypt),* } }
103            pub fn get_clear(&self) -> #name { #name { #(#decrypt_fields),* } }
104        }
105    };
106
107    TokenStream::from(expanded)
108}
rustcrypt_derive/lib.rs

rustcrypt_derive/
lib.rs
