Falcon: fix codespell and source-text CI checks

- codespell.yml: add "fpr"/"FPR" to ignore_words_list. "fpr" is the Falcon
  reference's canonical name for the floating-point primitive seam and
  appears hundreds of times across the sources; it is not a typo.
- wc_falcon.c: rename local "clen" -> "compLen" (codespell flagged clen)
  and replace a non-ASCII em-dash in a comment with "--" (check-source-text
  8-bit byte violation).
- wc_falcon_bigint.c: fix typos "morever" -> "moreover", "Mutiply" ->
  "Multiply".
- wc_falcon_codec.c: reword "are statics in" -> "are static functions in"
  (codespell flagged "statics").

.github/workflows/codespell.yml

@@ -24,7 +24,7 @@ jobs:
         check_filenames: true
         check_hidden: true
           # Add comma separated list of words that occur multiple times that should be ignored (sorted alphabetically, case sensitive)
-        ignore_words_list: adin,ameba,aNULL,brunch,carryIn,chainG,ciph,cLen,cliKs,dout,haveA,inCreated,inOut,inout,larg,LEAPYEAR,Merget,optionA,parm,parms,repid,rIn,userA,ser,siz,te,Te,HSI,failT,toLen,vor,
+        ignore_words_list: adin,ameba,aNULL,brunch,carryIn,chainG,ciph,cLen,cliKs,dout,FPR,fpr,haveA,inCreated,inOut,inout,larg,LEAPYEAR,Merget,optionA,parm,parms,repid,rIn,userA,ser,siz,te,Te,HSI,failT,toLen,vor,
           # The exclude_file contains lines of code that should be ignored. This is useful for individual lines which have non-words that can safely be ignored.
         exclude_file: '.codespellexcludelines'
           # To skip files entirely from being processed, add it to the following list:

wolfcrypt/src/wc_falcon.c

@@ -105,7 +105,7 @@ static void falcon_build_tables(int logn, word32 psi, word16* zetas,
 
 /* Twiddle tables are identical for every verification at a given level, so
  * compute them once and cache them (the previous code rebuilt them per call
- * via O(n) modular exponentiations — the dominant verify cost). The lazy-init
+ * via O(n) modular exponentiations -- the dominant verify cost). The lazy-init
  * race is benign: the values are deterministic, so concurrent first-callers
  * write identical data. */
 static word16 falcon_zetas_l1[FALCON_LEVEL1_N];
@@ -541,7 +541,7 @@ int falcon_native_sign_msg(const byte* in, word32 inLen, byte* out, word32* outL
     byte nonce[FALCON_NONCE_SIZE];
     void* heap;
     int attempt, haveSpc = 0;
-    size_t clen = 0;
+    size_t compLen = 0;
 
     if ((in == NULL && inLen != 0) || out == NULL || outLen == NULL ||
             key == NULL || rng == NULL) {
@@ -615,17 +615,17 @@ int falcon_native_sign_msg(const byte* in, word32 inLen, byte* out, word32* outL
         }
         out[0] = (byte)(FALCON_SIG_HEAD_COMPRESSED | logn);
         XMEMCPY(out + 1, nonce, FALCON_NONCE_SIZE);
-        clen = falcon_comp_encode(out + 1 + FALCON_NONCE_SIZE,
+        compLen = falcon_comp_encode(out + 1 + FALCON_NONCE_SIZE,
                 (size_t)(*outLen - 1 - FALCON_NONCE_SIZE), s2, logn);
-        if (clen != 0) {
+        if (compLen != 0) {
             break;
         }
     }
-    if (clen == 0) {
+    if (compLen == 0) {
         ret = BUFFER_E;
         goto out;
     }
-    *outLen = (word32)(1 + FALCON_NONCE_SIZE + clen);
+    *outLen = (word32)(1 + FALCON_NONCE_SIZE + compLen);
 
 out:
     /* Always zeroize: the SHAKE sponge may hold seed-derived state even if

wolfcrypt/src/wc_falcon_bigint.c

@@ -973,7 +973,7 @@ void modp_iNTT2_ext(word32* a, size_t stride, const word32* igm,
 
     /*
      * We need 1/n in Montgomery representation, i.e. R/n. Since
-     * 1 <= logn <= 10, R/n is an integer; morever, R/n <= 2^30 < p,
+     * 1 <= logn <= 10, R/n is an integer; moreover, R/n <= 2^30 < p,
      * thus a simple shift will do.
      */
     ni = (word32)1 << (31 - logn);
@@ -1011,7 +1011,7 @@ word32 zint_sub(word32* a, const word32* b, size_t len, word32 ctl)
 }
 
 /*
- * Mutiply the provided big integer m with a small value x.
+ * Multiply the provided big integer m with a small value x.
  * This function assumes that x < 2^31. The carry word is returned.
  */
 word32 zint_mul_small(word32* m, size_t mlen, word32 x)

wolfcrypt/src/wc_falcon_codec.c

@@ -24,8 +24,8 @@
  * implementation (codec.c): modq_encode, comp_encode, trim_i8_encode and
  * trim_i8_decode, plus the secret-key decoder that drives them.
  *
- * The verification-side decoders (modq_decode, comp_decode) are statics in
- * wc_falcon.c and are deliberately not duplicated here. */
+ * The verification-side decoders (modq_decode, comp_decode) are static
+ * functions in wc_falcon.c and are deliberately not duplicated here. */
 
 #include <wolfssl/wolfcrypt/libwolfssl_sources.h>