Import code from previous AssetBuilder version

thirdparty/libtomcrypt/pk/rsa/rsa_sign_saltlen_get.c

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+/* LibTomCrypt, modular cryptographic library -- Tom St Denis
+ *
+ * LibTomCrypt is a library that provides various cryptographic
+ * algorithms in a highly modular and flexible manner.
+ *
+ * The library is free for all purposes without any express
+ * guarantee it works.
+ */
+#include "tomcrypt.h"
+
+/**
+  @file rsa_sign_saltlen_get.c
+  Retrieve the maximum size of the salt, Steffen Jaeckel.
+*/
+
+#ifdef LTC_MRSA
+
+/**
+  Retrieve the maximum possible size of the salt when creating a PKCS#1 PSS signature.
+  @param padding    Type of padding (LTC_PKCS_1_PSS only)
+  @param hash_idx   The index of the desired hash
+  @param key        The RSA key
+  @return The maximum salt length in bytes or INT_MAX on error.
+*/
+int rsa_sign_saltlen_get_max_ex(int padding, int hash_idx, rsa_key *key)
+{
+  int ret = INT_MAX;
+  LTC_ARGCHK(key != NULL);
+
+  if ((hash_is_valid(hash_idx) == CRYPT_OK) &&
+      (padding == LTC_PKCS_1_PSS))
+  {
+    ret = rsa_get_size(key);
+    if (ret < INT_MAX)
+    {
+      ret -= (hash_descriptor[hash_idx].hashsize + 2);
+    } /* if */
+  } /* if */
+
+  return ret;
+}
+
+#endif
+
+/* ref:         HEAD -> master, tag: v1.18.2 */
+/* git commit:  7e7eb695d581782f04b24dc444cbfde86af59853 */
+/* commit time: 2018-07-01 22:49:01 +0200 */