transform-sha256: use Rust sha256 bindings

Use new Rust sha256 bindings insead of libnss.

src/detect-transform-sha256.c

@@ -34,17 +34,13 @@
 #include "util-unittest.h"
 #include "util-print.h"
 
-#ifdef HAVE_NSS
-#include <sechash.h>
-#endif
+#include "rust.h"
 
 static int DetectTransformToSha256Setup (DetectEngineCtx *, Signature *, const char *);
-#ifdef HAVE_NSS
 #ifdef UNITTESTS
 static void DetectTransformToSha256RegisterTests(void);
 #endif
 static void TransformToSha256(InspectionBuffer *buffer, void *options);
-#endif
 
 void DetectTransformSha256Register(void)
 {
@@ -55,25 +51,15 @@ void DetectTransformSha256Register(void)
         "/rules/transforms.html#to-sha256";
     sigmatch_table[DETECT_TRANSFORM_SHA256].Setup =
         DetectTransformToSha256Setup;
-#ifdef HAVE_NSS
     sigmatch_table[DETECT_TRANSFORM_SHA256].Transform =
         TransformToSha256;
 #ifdef UNITTESTS
     sigmatch_table[DETECT_TRANSFORM_SHA256].RegisterTests =
         DetectTransformToSha256RegisterTests;
-#endif
 #endif
     sigmatch_table[DETECT_TRANSFORM_SHA256].flags |= SIGMATCH_NOOPT;
 }
 
-#ifndef HAVE_NSS
-static int DetectTransformToSha256Setup (DetectEngineCtx *de_ctx, Signature *s, const char *nullstr)
-{
-    SCLogError(SC_ERR_NO_SHA256_SUPPORT, "no SHA-256 calculation support built in, "
-            "needed for to_sha256 keyword");
-    return -1;
-}
-#else
 /**
  *  \internal
  *  \brief Apply the nocase keyword to the last pattern match, either content or uricontent
@@ -86,6 +72,11 @@ static int DetectTransformToSha256Setup (DetectEngineCtx *de_ctx, Signature *s,
 static int DetectTransformToSha256Setup (DetectEngineCtx *de_ctx, Signature *s, const char *nullstr)
 {
     SCEnter();
+    if (g_disable_hashing) {
+        SCLogError(SC_ERR_HASHING_DISABLED, "SHA256 hashing has been disabled, "
+                                            "needed for to_sha256 keyword");
+        SCReturnInt(-1);
+    }
     int r = DetectSignatureAddTransform(s, DETECT_TRANSFORM_SHA256, NULL);
     SCReturnInt(r);
 }
@@ -94,21 +85,12 @@ static void TransformToSha256(InspectionBuffer *buffer, void *options)
 {
     const uint8_t *input = buffer->inspect;
     const uint32_t input_len = buffer->inspect_len;
-    uint8_t output[SHA256_LENGTH];
+    uint8_t output[SC_SHA256_LEN];
 
     //PrintRawDataFp(stdout, input, input_len);
-
-    HASHContext *sha256_ctx = HASH_Create(HASH_AlgSHA256);
-    if (sha256_ctx) {
-        HASH_Begin(sha256_ctx);
-        HASH_Update(sha256_ctx, input, input_len);
-        unsigned int len = 0;
-        HASH_End(sha256_ctx, output, &len, sizeof(output));
-        HASH_Destroy(sha256_ctx);
-
+    SCSha256HashBuffer(input, input_len, output, sizeof(output));
     InspectionBufferCopy(buffer, output, sizeof(output));
 }
-}
 
 #ifdef UNITTESTS
 static int DetectTransformToSha256Test01(void)
@@ -132,4 +114,3 @@ static void DetectTransformToSha256RegisterTests(void)
             DetectTransformToSha256Test01);
 }
 #endif
-#endif

src/rust.h

@@ -25,6 +25,7 @@
  * cbindgen. */
 #define SC_MD5_LEN    16
 #define SC_SHA1_LEN   20
+#define SC_SHA256_LEN 32
 
 #define JB_SET_STRING(jb, key, val) jb_set_formatted((jb), "\"" key "\":\"" val "\"")
 #define JB_SET_TRUE(jb, key) jb_set_formatted((jb), "\"" key "\":true")