--- /dev/null
+/*
+ * 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
+};
--- /dev/null
+=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
projects / openssl.git / commitdiff