/*- * Copyright (c) 2012 The University of Oslo * Copyright (c) 2012-2016 Dag-Erling Smørgrav * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. The name of the author may not be used to endorse or promote * products derived from this software without specific prior written * permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include "cryb/impl.h" #if HAVE_SYS_ENDIAN_H #include <sys/endian.h> #endif #if HAVE_ENDIAN_H #define _BSD_SOURCE #include <endian.h> #endif #include <stdint.h> #include <string.h> #include <cryb/hmac_sha224.h> void hmac_sha224_init(hmac_sha224_ctx *ctx, const void *key, size_t keylen) { uint8_t keybuf[SHA224_BLOCK_LEN], pad[SHA224_BLOCK_LEN]; /* prepare key */ memset(keybuf, 0, sizeof keybuf); if (keylen > sizeof keybuf) sha224_complete(key, keylen, keybuf); else memcpy(keybuf, key, keylen); /* input pad */ for (unsigned int i = 0; i < sizeof pad; ++i) pad[i] = 0x36 ^ keybuf[i]; sha224_init(&ctx->ictx); sha224_update(&ctx->ictx, pad, sizeof pad); /* output pad */ for (unsigned int i = 0; i < sizeof pad; ++i) pad[i] = 0x5c ^ keybuf[i]; sha224_init(&ctx->octx); sha224_update(&ctx->octx, pad, sizeof pad); /* hide the evidence */ memset(keybuf, 0, sizeof keybuf); memset(pad, 0, sizeof pad); } void hmac_sha224_update(hmac_sha224_ctx *ctx, const void *buf, size_t len) { sha224_update(&ctx->ictx, buf, len); } void hmac_sha224_final(hmac_sha224_ctx *ctx, uint8_t *mac) { uint8_t digest[SHA224_DIGEST_LEN]; sha224_final(&ctx->ictx, digest); sha224_update(&ctx->octx, digest, sizeof digest); sha224_final(&ctx->octx, mac); memset(ctx, 0, sizeof *ctx); } void hmac_sha224_complete(const void *key, size_t keylen, const void *buf, size_t len, uint8_t *mac) { hmac_sha224_ctx ctx; hmac_sha224_init(&ctx, key, keylen); hmac_sha224_update(&ctx, buf, len); hmac_sha224_final(&ctx, mac); }