Link RSA signature provider references

Author: thieman

src/verify.rs

@@ -36,8 +36,10 @@ pub static SUPPORTED_SIG_ALGS: WebPkiSupportedAlgorithms = WebPkiSupportedAlgori
         RSA_PSS_SHA384,
         RSA_PSS_SHA256,
         // RFC 4055 section 2.1 requires accepting hash AlgorithmIdentifiers both with
-        // explicit NULL parameters and with parameters absent; rustls-webpki registers both
-        // forms for RSA PKCS#1 certificate signatures.
+        // explicit NULL parameters and with parameters absent:
+        // https://www.rfc-editor.org/rfc/rfc4055.html#section-2.1
+        // rustls-webpki mirrors that with separate RSA PKCS#1 `_ABSENT_PARAMS` algorithms:
+        // https://docs.rs/rustls-webpki/0.103.13/src/rustls_webpki/aws_lc_rs_algs.rs.html#186-245
         RSA_PKCS1_SHA512,
         RSA_PKCS1_SHA512_ABSENT_PARAMS,
         RSA_PKCS1_SHA384,
@@ -252,7 +254,8 @@ enum Params {
 unsafe impl Send for Params {}
 unsafe impl Sync for Params {}
 
-// Match rustls-webpki's RSA verification algorithms, which are defined for 2048-8192-bit keys.
+// Match rustls-webpki's RSA verification algorithms, which are defined for 2048-8192-bit keys:
+// https://docs.rs/rustls-webpki/0.103.13/src/rustls_webpki/aws_lc_rs_algs.rs.html#162-182
 const RSA_MIN_MODULUS_BITS: usize = 2048;
 const RSA_MAX_MODULUS_BITS: usize = 8192;