Merge pull request wolfSSL#9515 from anhu/salt_len_min

Note that HMAC_FIPS_MIN_KEY is also salt len min for HKDF

Author: douzzer

wolfcrypt/src/error.c

@@ -315,7 +315,7 @@ const char* wc_GetErrorString(int error)
         return "Random Number Generator failed";
 
     case HMAC_MIN_KEYLEN_E:
-        return "FIPS Mode HMAC Minimum Key Length error";
+        return "FIPS Mode HMAC Minimum Key or Salt Length error";
 
     case RSA_PAD_E:
         return "Rsa Padding error";

wolfssl/wolfcrypt/hmac.h

@@ -66,8 +66,9 @@
 #define WC_HMAC_INNER_HASH_KEYED_DEV    2
 
 enum {
-    HMAC_FIPS_MIN_KEY = 14,   /* 112 bit key length minimum */
-
+    HMAC_FIPS_MIN_KEY = 14,   /* 112 bit key length minimum. Note that this
+                               * minimum also applies to the salt length for
+                               * HKDF. */
     IPAD    = 0x36,
     OPAD    = 0x5C,