EVP_MAC: Add SipHash implementation

Reviewed-by: Paul Dale <paul.dale@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/7494)

crypto/evp/c_allm.c

@@ -16,4 +16,7 @@ void openssl_add_all_macs_int(void)
     EVP_add_mac(&cmac_meth);
 #endif
     EVP_add_mac(&hmac_meth);
+#ifndef OPENSSL_NO_SIPHASH
+    EVP_add_mac(&siphash_meth);
+#endif
 }

crypto/include/internal/evp_int.h

@@ -130,6 +130,7 @@ struct evp_mac_st {
 
 extern const EVP_MAC cmac_meth;
 extern const EVP_MAC hmac_meth;
+extern const EVP_MAC siphash_meth;
 
 /*
  * This function is internal for now, but can be made external when needed.

crypto/siphash/build.info

@@ -1,5 +1,6 @@
 LIBS=../../libcrypto
 SOURCE[../../libcrypto]=\
 	siphash.c \
+	siphash_meth.c \
 	siphash_pmeth.c \
 	siphash_ameth.c

crypto/siphash/siphash_meth.c

@@ -0,0 +1,139 @@
+/*
+ * Copyright 2018 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
+ */
+
+#include <stdarg.h>
+#include <string.h>
+#include <openssl/evp.h>
+#include <openssl/err.h>
+#include "internal/siphash.h"
+#include "siphash_local.h"
+#include "internal/evp_int.h"
+
+/* local SIPHASH structure is actually a SIPHASH */
+
+struct evp_mac_impl_st {
+    SIPHASH ctx;
+};
+
+static EVP_MAC_IMPL *siphash_new(void)
+{
+    return OPENSSL_zalloc(sizeof(EVP_MAC_IMPL));
+}
+
+static void siphash_free(EVP_MAC_IMPL *sctx)
+{
+    OPENSSL_free(sctx);
+}
+
+static int siphash_copy(EVP_MAC_IMPL *sdst, EVP_MAC_IMPL *ssrc)
+{
+    *sdst = *ssrc;
+    return 1;
+}
+
+static size_t siphash_size(EVP_MAC_IMPL *sctx)
+{
+    return SipHash_hash_size(&sctx->ctx);
+}
+
+static int siphash_init(EVP_MAC_IMPL *sctx)
+{
+    /* Not much to do here, actual initialization happens through controls */
+    return 1;
+}
+
+static int siphash_update(EVP_MAC_IMPL *sctx, const unsigned char *data,
+                       size_t datalen)
+{
+    SipHash_Update(&sctx->ctx, data, datalen);
+    return 1;
+}
+
+static int siphash_final(EVP_MAC_IMPL *sctx, unsigned char *out)
+{
+    size_t hlen = siphash_size(sctx);
+
+    return SipHash_Final(&sctx->ctx, out, hlen);
+}
+
+static int siphash_ctrl(EVP_MAC_IMPL *sctx, int cmd, va_list args)
+{
+    switch (cmd) {
+    case EVP_MAC_CTRL_SET_SIZE:
+        {
+            size_t size = va_arg(args, size_t);
+
+            return SipHash_set_hash_size(&sctx->ctx, size);
+        }
+        break;
+    case EVP_MAC_CTRL_SET_KEY:
+        {
+            const unsigned char *key = va_arg(args, const unsigned char *);
+            size_t keylen = va_arg(args, size_t);
+
+            if (key == NULL || keylen != SIPHASH_KEY_SIZE)
+                return 0;
+
+            return SipHash_Init(&sctx->ctx, key, 0, 0);
+        }
+        break;
+    default:
+        return -2;
+    }
+    return 1;
+}
+
+static int siphash_ctrl_int(EVP_MAC_IMPL *sctx, int cmd, ...)
+{
+    int rv;
+    va_list args;
+
+    va_start(args, cmd);
+    rv = siphash_ctrl(sctx, cmd, args);
+    va_end(args);
+
+    return rv;
+}
+
+static int siphash_ctrl_str_cb(void *ctx, int cmd, void *buf, size_t buflen)
+{
+    return siphash_ctrl_int(ctx, cmd, buf, buflen);
+}
+
+static int siphash_ctrl_str(EVP_MAC_IMPL *ctx,
+                            const char *type, const char *value)
+{
+    if (value == NULL)
+        return 0;
+    if (strcmp(type, "digestsize") == 0) {
+        size_t hash_size = atoi(value);
+
+        return siphash_ctrl_int(ctx, EVP_MAC_CTRL_SET_SIZE, hash_size);
+    }
+    if (strcmp(type, "key") == 0)
+        return EVP_str2ctrl(siphash_ctrl_str_cb, ctx, EVP_MAC_CTRL_SET_KEY,
+                            value);
+    if (strcmp(type, "hexkey") == 0)
+        return EVP_hex2ctrl(siphash_ctrl_str_cb, ctx, EVP_MAC_CTRL_SET_KEY,
+                            value);
+    return -2;
+}
+
+const EVP_MAC siphash_meth = {
+    EVP_MAC_SIPHASH,
+    siphash_new,
+    siphash_copy,
+    siphash_free,
+    siphash_size,
+    siphash_init,
+    siphash_update,
+    siphash_final,
+    siphash_ctrl,
+    siphash_ctrl_str
+};

doc/man3/EVP_MAC.pod

@@ -327,7 +327,8 @@ F<./foo>)
 =head1 SEE ALSO
 
 L<EVP_MAC_CMAC(7)>,
-L<EVP_MAC_HMAC(7)>
+L<EVP_MAC_HMAC(7)>,
+L<EVP_MAC_SIPHASH(7)>
 
 =head1 COPYRIGHT
 

doc/man7/EVP_MAC_SIPHASH.pod

@@ -0,0 +1,61 @@
+=pod
+
+=head1 NAME
+
+EVP_MAC_SIPHASH - The SipHash EVP_MAC implementation
+
+=head1 DESCRIPTION
+
+Support for computing SipHash MACs through the B<EVP_MAC> API.
+
+=head2 Numeric identity
+
+B<EVP_MAC_SIPHASH> is the numeric identity for this implementation,
+and can be used in functions like EVP_MAC_CTX_new_id() and
+EVP_get_macbynid().
+
+=head2 Supported controls
+
+The supported controls are:
+
+=over 4
+
+=item B<EVP_MAC_CTRL_SET_SIZE>
+
+EVP_MAC_ctrl_str() type string: "digestsize"
+
+The value string is expected to contain a decimal number.
+
+=item B<EVP_MAC_CTRL_SET_KEY>
+
+EVP_MAC_ctrl_str() takes to type string for this control:
+
+=over 4
+
+=item "key"
+
+The value string is used as is.
+
+=item "hexkey"
+
+The value string is expected to be a hexadecimal number, which will be
+decoded before passing on as control value.
+
+=back
+
+=back
+
+=head1 SEE ALSO
+
+L<EVP_MAC_ctrl(3)>, L<EVP_MAC(3)/CONTROLS>
+
+=head1 COPYRIGHT
+
+Copyright 2018 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
+L<https://www.openssl.org/source/license.html>.
+
+=cut

include/openssl/evp.h

@@ -987,8 +987,9 @@ void EVP_MD_do_all_sorted(void (*fn)
 
 /* MAC stuff */
 
-# define EVP_MAC_CMAC   NID_cmac
-# define EVP_MAC_HMAC   NID_hmac
+# define EVP_MAC_CMAC           NID_cmac
+# define EVP_MAC_HMAC           NID_hmac
+# define EVP_MAC_SIPHASH        NID_siphash
 
 EVP_MAC_CTX *EVP_MAC_CTX_new(const EVP_MAC *mac);
 EVP_MAC_CTX *EVP_MAC_CTX_new_id(int nid);

test/recipes/30-test_evp_data/evpmac.txt

@@ -157,7 +157,7 @@ Output = 5150d1772f50834a503e069a973fbd7c
 MAC = SipHash
 Ctrl = digestsize:13
 Key = 000102030405060708090A0B0C0D0E0F
-Result = EVPPKEYCTXCTRL_ERROR
+Result = MAC_CTRL_ERROR
 
 Title = HMAC tests (from RFC2104 and others)