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Rust wrapper: add comments about label pointer casts in rsa.rs

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This commit is contained in:
Josh Holtrop
2026-06-01 14:57:58 -04:00
parent b737370ac4
commit 226f96db33
1 changed files with 6 additions and 0 deletions
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wrapper/rust/wolfssl-wolfcrypt/src/rsa.rs
+6
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@@ -928,10 +928,13 @@ impl RSA {
let din_size = crate::buffer_len_to_u32(din.len())?;
let dout_size = crate::buffer_len_to_u32(dout.len())?;
let (label_ptr, label_size) = match label {
// wolfSSL C API takes label as `byte *` but only reads from it.
Some(label) => (label.as_ptr() as *mut u8, crate::buffer_len_to_u32(label.len())?),
None => (core::ptr::null_mut(), 0),
};
let rc = unsafe {
// SAFETY: label_ptr is declared as a mutable pointer but is only
// read from.
sys::wc_RsaPublicEncrypt_ex(din.as_ptr(), din_size,
dout.as_mut_ptr(), dout_size, &mut self.wc_rsakey,
rng.wc_rng, sys::WC_RSA_OAEP_PAD as i32,
@@ -988,10 +991,13 @@ impl RSA {
let din_size = crate::buffer_len_to_u32(din.len())?;
let dout_size = crate::buffer_len_to_u32(dout.len())?;
let (label_ptr, label_size) = match label {
// wolfSSL C API takes label as `byte *` but only reads from it.
Some(label) => (label.as_ptr() as *mut u8, crate::buffer_len_to_u32(label.len())?),
None => (core::ptr::null_mut(), 0),
};
let rc = unsafe {
// SAFETY: label_ptr is declared as a mutable pointer but is only
// read from.
sys::wc_RsaPrivateDecrypt_ex(din.as_ptr(), din_size,
dout.as_mut_ptr(), dout_size, &mut self.wc_rsakey,
sys::WC_RSA_OAEP_PAD as i32,