openssl: Remove unused openssl_hash_chunk() helper

Was used by the ECDSA implementation before 293a912c7d ("openssl: Fixes
for ECDSA with OpenSSL 3.0").

src/libstrongswan/plugins/openssl/openssl_util.c

@@ -129,51 +129,6 @@ bool openssl_fingerprint(EVP_PKEY *key, cred_encoding_type_t type, chunk_t *fp)
 	return TRUE;
 }
 
-/**
- * Described in header.
- */
-bool openssl_hash_chunk(int hash_type, chunk_t data, chunk_t *hash)
-{
-	EVP_MD_CTX *ctx;
-	bool ret = FALSE;
-	const EVP_MD *hasher = EVP_get_digestbynid(hash_type);
-	if (!hasher)
-	{
-		return FALSE;
-	}
-
-	ctx = EVP_MD_CTX_create();
-	if (!ctx)
-	{
-		goto error;
-	}
-
-	if (!EVP_DigestInit_ex(ctx, hasher, NULL))
-	{
-		goto error;
-	}
-
-	if (!EVP_DigestUpdate(ctx, data.ptr, data.len))
-	{
-		goto error;
-	}
-
-	*hash = chunk_alloc(EVP_MD_size(hasher));
-	if (!EVP_DigestFinal_ex(ctx, hash->ptr, NULL))
-	{
-		chunk_free(hash);
-		goto error;
-	}
-
-	ret = TRUE;
-error:
-	if (ctx)
-	{
-		EVP_MD_CTX_destroy(ctx);
-	}
-	return ret;
-}
-
 /**
  * Described in header.
  */