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134148276b
[skip ci] Reviewed-by: Matt Caswell <matt@openssl.org> (Merged from https://github.com/openssl/openssl/pull/7817)
140 lines
3.2 KiB
C
140 lines
3.2 KiB
C
/*
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* Copyright 2018 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the Apache License 2.0 (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#include <stdarg.h>
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#include <string.h>
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#include <openssl/evp.h>
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#include <openssl/err.h>
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#include "internal/siphash.h"
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#include "siphash_local.h"
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#include "internal/evp_int.h"
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/* local SIPHASH structure is actually a SIPHASH */
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struct evp_mac_impl_st {
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SIPHASH ctx;
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};
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static EVP_MAC_IMPL *siphash_new(void)
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{
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return OPENSSL_zalloc(sizeof(EVP_MAC_IMPL));
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}
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static void siphash_free(EVP_MAC_IMPL *sctx)
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{
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OPENSSL_free(sctx);
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}
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static int siphash_copy(EVP_MAC_IMPL *sdst, EVP_MAC_IMPL *ssrc)
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{
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*sdst = *ssrc;
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return 1;
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}
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static size_t siphash_size(EVP_MAC_IMPL *sctx)
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{
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return SipHash_hash_size(&sctx->ctx);
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}
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static int siphash_init(EVP_MAC_IMPL *sctx)
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{
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/* Not much to do here, actual initialization happens through controls */
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return 1;
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}
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static int siphash_update(EVP_MAC_IMPL *sctx, const unsigned char *data,
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size_t datalen)
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{
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SipHash_Update(&sctx->ctx, data, datalen);
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return 1;
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}
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static int siphash_final(EVP_MAC_IMPL *sctx, unsigned char *out)
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{
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size_t hlen = siphash_size(sctx);
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return SipHash_Final(&sctx->ctx, out, hlen);
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}
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static int siphash_ctrl(EVP_MAC_IMPL *sctx, int cmd, va_list args)
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{
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switch (cmd) {
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case EVP_MAC_CTRL_SET_SIZE:
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{
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size_t size = va_arg(args, size_t);
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return SipHash_set_hash_size(&sctx->ctx, size);
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}
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break;
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case EVP_MAC_CTRL_SET_KEY:
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{
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const unsigned char *key = va_arg(args, const unsigned char *);
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size_t keylen = va_arg(args, size_t);
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if (key == NULL || keylen != SIPHASH_KEY_SIZE)
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return 0;
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return SipHash_Init(&sctx->ctx, key, 0, 0);
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}
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break;
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default:
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return -2;
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}
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return 1;
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}
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static int siphash_ctrl_int(EVP_MAC_IMPL *sctx, int cmd, ...)
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{
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int rv;
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va_list args;
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va_start(args, cmd);
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rv = siphash_ctrl(sctx, cmd, args);
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va_end(args);
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return rv;
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}
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static int siphash_ctrl_str_cb(void *ctx, int cmd, void *buf, size_t buflen)
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{
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return siphash_ctrl_int(ctx, cmd, buf, buflen);
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}
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static int siphash_ctrl_str(EVP_MAC_IMPL *ctx,
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const char *type, const char *value)
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{
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if (value == NULL)
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return 0;
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if (strcmp(type, "digestsize") == 0) {
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size_t hash_size = atoi(value);
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return siphash_ctrl_int(ctx, EVP_MAC_CTRL_SET_SIZE, hash_size);
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}
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if (strcmp(type, "key") == 0)
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return EVP_str2ctrl(siphash_ctrl_str_cb, ctx, EVP_MAC_CTRL_SET_KEY,
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value);
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if (strcmp(type, "hexkey") == 0)
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return EVP_hex2ctrl(siphash_ctrl_str_cb, ctx, EVP_MAC_CTRL_SET_KEY,
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value);
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return -2;
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}
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const EVP_MAC siphash_meth = {
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EVP_MAC_SIPHASH,
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siphash_new,
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siphash_copy,
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siphash_free,
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siphash_size,
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siphash_init,
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siphash_update,
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siphash_final,
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siphash_ctrl,
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siphash_ctrl_str
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};
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