Add support for parameterized SipHash

The core SipHash supports either 8 or 16-byte output and a configurable
number of rounds.
The default behavior, as added to EVP, is to use 16-byte output and
2,4 rounds, which matches the behavior of most implementations.
There is an EVP_PKEY_CTRL that can control the output size.

Reviewed-by: Richard Levitte <levitte@openssl.org>
Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/2216)

1 files changed, 23 insertions, 0 deletions

diff --git a/crypto/siphash/siphash_local.h b/crypto/siphash/siphash_local.h
new file mode 100644
index 0000000..5ad3476
--- /dev/null
+++ b/crypto/siphash/siphash_local.h
@@ -0,0 +1,23 @@
+/*
+ * Copyright 2017 The OpenSSL Project Authors. All Rights Reserved.
+ *
+ * Licensed under the OpenSSL license (the "License").  You may not use
+ * this file except in compliance with the License.  You can obtain a copy
+ * in the file LICENSE in the source distribution or at
+ * https://www.openssl.org/source/license.html
+ */
+
+/* Based on https://131002.net/siphash C reference implementation */
+
+struct siphash_st {
+    uint64_t total_inlen;
+    uint64_t v0;
+    uint64_t v1;
+    uint64_t v2;
+    uint64_t v3;
+    unsigned int len;
+    int hash_size;
+    int crounds;
+    int drounds;
+    unsigned char leavings[SIPHASH_BLOCK_SIZE];
+};