crpytocb: support SHA224 under WOLF_CRYPTO_CB_ONLY_SHA256

.github/workflows/cryptocb-only.yml

@@ -29,9 +29,8 @@ jobs:
           - name: RSA
             cppflags: -DWOLF_CRYPTO_CB_ONLY_RSA
           # WOLF_CRYPTO_CB_ONLY_SHA256: strips software SHA-256; swdev provides
-          # the software path via cryptocb.  SHA-224 not yet supported.
+          # the software path via cryptocb.
           - name: SHA256
-            extra_config: --disable-sha224
             cppflags: -DWOLF_CRYPTO_CB_ONLY_SHA256
           # WOLF_CRYPTO_CB_ONLY_AES: strips software AES; swdev provides the
           # software path via cryptocb.
@@ -49,7 +48,6 @@ jobs:
           # algorithm call that a single-strip entry would still resolve via
           # the remaining software paths.
           - name: ALL
-            extra_config: --disable-sha224
             cppflags: >-
               -DWOLF_CRYPTO_CB_ONLY_ECC -DWOLF_CRYPTO_CB_ONLY_RSA
               -DWOLF_CRYPTO_CB_ONLY_SHA256 -DWOLF_CRYPTO_CB_ONLY_AES

tests/swdev/README.md

@@ -119,8 +119,7 @@ struct layouts, so flipping them between the two compiles is safe.
             CPPFLAGS="-DWOLF_CRYPTO_CB_ONLY_ECC \
                       -DWOLF_CRYPTO_CB_ONLY_RSA \
                       -DWOLF_CRYPTO_CB_ONLY_SHA256 \
-                      -DWOLF_CRYPTO_CB_ONLY_AES" \
-            --disable-sha224
+                      -DWOLF_CRYPTO_CB_ONLY_AES"
 make
 make check
 ```
@@ -135,8 +134,6 @@ Notes:
   Out-of-tree (VPATH) builds fail at configure time. swdev is built
   from `wolfcrypt/test/include.am` and inherits `PARENT_SRCS`,
   `PARENT_BUILD_CFLAGS`, etc., from the parent build.
-- `--disable-sha224` is required when `WOLF_CRYPTO_CB_ONLY_SHA256` is
-  set: SHA-224 is unsupported for now.
 
 For the full CI matrix that exercises each `_ONLY_*` macro, see
 `.github/workflows/cryptocb-only.yml`.

tests/swdev/swdev.c

@@ -209,6 +209,44 @@ static int swdev_sha256(wc_CryptoInfo* info)
     wc_Sha256Free(&shadow);
     return ret;
 }
+
+#ifdef WOLFSSL_SHA224
+/* SHA-224 is SHA-256 with a different IV/truncation; wc_Sha224 is a typedef
+ * of wc_Sha256, so the same shadow/copy-state dance applies. */
+static int swdev_sha224(wc_CryptoInfo* info)
+{
+    wc_Sha224* sha224 = info->hash.sha224;
+    wc_Sha224 shadow;
+    int ret;
+
+    if (sha224 == NULL)
+        return BAD_FUNC_ARG;
+
+    ret = wc_InitSha224(&shadow);
+    if (ret != 0)
+        return ret;
+
+    swdev_sha256_copy_state((wc_Sha256*)&shadow, (const wc_Sha256*)sha224);
+
+    if (info->hash.in != NULL) {
+        ret = wc_Sha224Update(&shadow, info->hash.in, info->hash.inSz);
+        if (ret != 0)
+            goto out;
+    }
+
+    if (info->hash.digest != NULL) {
+        ret = wc_Sha224Final(&shadow, info->hash.digest);
+        if (ret != 0)
+            goto out;
+    }
+
+    swdev_sha256_copy_state((wc_Sha256*)sha224, (const wc_Sha256*)&shadow);
+
+out:
+    wc_Sha224Free(&shadow);
+    return ret;
+}
+#endif /* WOLFSSL_SHA224 */
 #endif /* !NO_SHA256 */
 
 #ifndef NO_AES
@@ -513,6 +551,10 @@ WC_SWDEV_EXPORT int wc_SwDev_Callback(int devId, wc_CryptoInfo* info,
         switch (info->hash.type) {
         case WC_HASH_TYPE_SHA256:
             return swdev_sha256(info);
+    #ifdef WOLFSSL_SHA224
+        case WC_HASH_TYPE_SHA224:
+            return swdev_sha224(info);
+    #endif
         default:
             return CRYPTOCB_UNAVAILABLE;
         }

wolfcrypt/src/sha256.c

@@ -60,10 +60,6 @@ on the specific device platform.
 
 #if !defined(NO_SHA256) && !defined(WOLFSSL_RISCV_ASM)
 
-#if defined(WOLF_CRYPTO_CB_ONLY_SHA256) && defined(WOLFSSL_SHA224)
-    #error "WOLF_CRYPTO_CB_ONLY_SHA256 is incompatible with WOLFSSL_SHA224"
-#endif
-
 #if defined(HAVE_FIPS) && defined(HAVE_FIPS_VERSION) && (HAVE_FIPS_VERSION >= 2)
     /* set NO_WRAPPERS before headers, use direct internal f()s not wrappers */
     #define FIPS_NO_WRAPPERS
@@ -2148,6 +2144,35 @@ static WC_INLINE int Transform_Sha256_Len(wc_Sha256* sha256, const byte* data,
 #elif defined(PSOC6_HASH_SHA2)
     /* Implemented in wolfcrypt/src/port/cypress/psoc6_crypto.c */
 
+#elif defined(WOLF_CRYPTO_CB_ONLY_SHA256)
+    int wc_InitSha224_ex(wc_Sha224* sha224, void* heap, int devId)
+    {
+        int ret;
+        if (sha224 == NULL)
+            return BAD_FUNC_ARG;
+        ret = InitSha256((wc_Sha256*)sha224);
+        if (ret != 0)
+            return ret;
+        sha224->digest[0] = 0xc1059ed8;
+        sha224->digest[1] = 0x367cd507;
+        sha224->digest[2] = 0x3070dd17;
+        sha224->digest[3] = 0xf70e5939;
+        sha224->digest[4] = 0xffc00b31;
+        sha224->digest[5] = 0x68581511;
+        sha224->digest[6] = 0x64f98fa7;
+        sha224->digest[7] = 0xbefa4fa4;
+        sha224->heap   = heap;
+        sha224->devId  = devId;
+        sha224->devCtx = NULL;
+    #ifdef WOLFSSL_SMALL_STACK_CACHE
+        sha224->W = NULL;
+    #endif
+    #ifdef WOLFSSL_ASYNC_CRYPT
+        XMEMSET(&sha224->asyncDev, 0, sizeof(sha224->asyncDev));
+    #endif
+        return ret;
+    }
+
 #else
 
     #define NEED_SOFT_SHA224
@@ -2369,6 +2394,50 @@ static WC_INLINE int Transform_Sha256_Len(wc_Sha256* sha256, const byte* data,
     }
 #endif /* end of SHA224 software implementation */
 
+#ifdef WOLF_CRYPTO_CB_ONLY_SHA256
+
+    int wc_Sha224Update(wc_Sha224* sha224, const byte* data, word32 len)
+    {
+        if (sha224 == NULL)
+            return BAD_FUNC_ARG;
+        if (data == NULL && len == 0)
+            return 0;
+        if (data == NULL)
+            return BAD_FUNC_ARG;
+
+        #ifndef WOLF_CRYPTO_CB_FIND
+        if (sha224->devId != INVALID_DEVID)
+        #endif
+        {
+            int ret = wc_CryptoCb_Sha224Hash(sha224, data, len, NULL);
+            if (ret != WC_NO_ERR_TRACE(CRYPTOCB_UNAVAILABLE))
+                return ret;
+        }
+
+        return NO_VALID_DEVID;
+    }
+
+    int wc_Sha224Final(wc_Sha224* sha224, byte* hash)
+    {
+        int ret;
+
+        if (sha224 == NULL || hash == NULL)
+            return BAD_FUNC_ARG;
+
+        #ifndef WOLF_CRYPTO_CB_FIND
+        if (sha224->devId != INVALID_DEVID)
+        #endif
+        {
+            ret = wc_CryptoCb_Sha224Hash(sha224, NULL, 0, hash);
+            if (ret != WC_NO_ERR_TRACE(CRYPTOCB_UNAVAILABLE))
+                return ret;
+        }
+
+        return NO_VALID_DEVID;
+    }
+
+#endif /* WOLF_CRYPTO_CB_ONLY_SHA256 */
+
     int wc_InitSha224(wc_Sha224* sha224)
     {
         int devId = INVALID_DEVID;

wolfcrypt/test/test.c

@@ -72301,6 +72301,40 @@ static int myCryptoDevCb(int devIdArg, wc_CryptoInfo* info, void* ctx)
         }
         else
     #endif
+    #ifdef WOLFSSL_SHA224
+        if (info->hash.type == WC_HASH_TYPE_SHA224) {
+            if (info->hash.sha224 == NULL)
+                return NOT_COMPILED_IN;
+
+            /* set devId to invalid, so software is used */
+            info->hash.sha224->devId = INVALID_DEVID;
+            #if defined(WOLF_CRYPTO_CB_ONLY_SHA256)
+            #ifdef DEBUG_WOLFSSL
+            printf("CryptoDevCb: exampleVar %d\n", myCtx->exampleVar);
+            #endif
+            if (myCtx->exampleVar == 99) {
+                info->hash.sha224->devId = devIdArg;
+                return 0;
+            }
+            #endif
+
+            if (info->hash.in != NULL) {
+                ret = wc_Sha224Update(
+                    info->hash.sha224,
+                    info->hash.in,
+                    info->hash.inSz);
+            }
+            if (info->hash.digest != NULL) {
+                ret = wc_Sha224Final(
+                    info->hash.sha224,
+                    info->hash.digest);
+            }
+
+            /* reset devId */
+            info->hash.sha224->devId = devIdArg;
+        }
+        else
+    #endif
     #ifdef WOLFSSL_SHA384
         if (info->hash.type == WC_HASH_TYPE_SHA384) {
             if (info->hash.sha384 == NULL)