Changes to address issues brought up by the security review.

CASA-auth-token/server/AuthTokenValidate/idenTokenProviders/casa/identokenprovider.c

@@ -147,7 +147,7 @@ CasaStatus
 GetIdentityTokenIf(
    IN       const void        *pIfInstance,
    IN       const char        *pTokenBuf,
-   IN       const int         tokenLen,
+   IN       const size_t      tokenLen,
    INOUT    IdenTokenIf       **ppIdenTokenIf)
 //
 // Arguments:  
@@ -175,13 +175,14 @@ GetIdentityTokenIf(
 {
    CasaStatus  retStatus;
    char        *pDecodedTokenBuf;
-   int         decodedTokenBufLen;
+   uint32_t    decodedTokenBufLen;
 
    DbgTrace(2, "-GetIdentityTokenIf- Start\n", 0);
 
    // Validate input parameters
    if (pIfInstance == NULL
        || pTokenBuf == NULL
+       || tokenLen > UINT32_MAX
        || tokenLen == 0
        || ppIdenTokenIf == NULL)
    {