155714Skris/* crypto/hmac/hmac.c */ 255714Skris/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 355714Skris * All rights reserved. 455714Skris * 555714Skris * This package is an SSL implementation written 655714Skris * by Eric Young (eay@cryptsoft.com). 755714Skris * The implementation was written so as to conform with Netscapes SSL. 8280304Sjkim * 955714Skris * This library is free for commercial and non-commercial use as long as 1055714Skris * the following conditions are aheared to. The following conditions 1155714Skris * apply to all code found in this distribution, be it the RC4, RSA, 1255714Skris * lhash, DES, etc., code; not just the SSL code. The SSL documentation 1355714Skris * included with this distribution is covered by the same copyright terms 1455714Skris * except that the holder is Tim Hudson (tjh@cryptsoft.com). 15280304Sjkim * 1655714Skris * Copyright remains Eric Young's, and as such any Copyright notices in 1755714Skris * the code are not to be removed. 1855714Skris * If this package is used in a product, Eric Young should be given attribution 1955714Skris * as the author of the parts of the library used. 2055714Skris * This can be in the form of a textual message at program startup or 2155714Skris * in documentation (online or textual) provided with the package. 22280304Sjkim * 2355714Skris * Redistribution and use in source and binary forms, with or without 2455714Skris * modification, are permitted provided that the following conditions 2555714Skris * are met: 2655714Skris * 1. Redistributions of source code must retain the copyright 2755714Skris * notice, this list of conditions and the following disclaimer. 2855714Skris * 2. Redistributions in binary form must reproduce the above copyright 2955714Skris * notice, this list of conditions and the following disclaimer in the 3055714Skris * documentation and/or other materials provided with the distribution. 3155714Skris * 3. All advertising materials mentioning features or use of this software 3255714Skris * must display the following acknowledgement: 3355714Skris * "This product includes cryptographic software written by 3455714Skris * Eric Young (eay@cryptsoft.com)" 3555714Skris * The word 'cryptographic' can be left out if the rouines from the library 3655714Skris * being used are not cryptographic related :-). 37280304Sjkim * 4. If you include any Windows specific code (or a derivative thereof) from 3855714Skris * the apps directory (application code) you must include an acknowledgement: 3955714Skris * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 40280304Sjkim * 4155714Skris * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 4255714Skris * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 4355714Skris * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 4455714Skris * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 4555714Skris * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 4655714Skris * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 4755714Skris * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 4855714Skris * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 4955714Skris * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 5055714Skris * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 5155714Skris * SUCH DAMAGE. 52280304Sjkim * 5355714Skris * The licence and distribution terms for any publically available version or 5455714Skris * derivative of this code cannot be changed. i.e. this code cannot simply be 5555714Skris * copied and put under another distribution licence 5655714Skris * [including the GNU Public Licence.] 5755714Skris */ 5855714Skris#include <stdio.h> 5955714Skris#include <stdlib.h> 6055714Skris#include <string.h> 61160814Ssimon#include "cryptlib.h" 6255714Skris#include <openssl/hmac.h> 6355714Skris 64238405Sjkim#ifdef OPENSSL_FIPS 65280304Sjkim# include <openssl/fips.h> 66238405Sjkim#endif 67194206Ssimon 68238405Sjkimint HMAC_Init_ex(HMAC_CTX *ctx, const void *key, int len, 69280304Sjkim const EVP_MD *md, ENGINE *impl) 70280304Sjkim{ 71280304Sjkim int i, j, reset = 0; 72280304Sjkim unsigned char pad[HMAC_MAX_MD_CBLOCK]; 7355714Skris 74238405Sjkim#ifdef OPENSSL_FIPS 75280304Sjkim if (FIPS_mode()) { 76280304Sjkim /* If we have an ENGINE need to allow non FIPS */ 77280304Sjkim if ((impl || ctx->i_ctx.engine) 78280304Sjkim && !(ctx->i_ctx.flags & EVP_CIPH_FLAG_NON_FIPS_ALLOW)) { 79280304Sjkim EVPerr(EVP_F_HMAC_INIT_EX, EVP_R_DISABLED_FOR_FIPS); 80280304Sjkim return 0; 81280304Sjkim } 82280304Sjkim /* 83280304Sjkim * Other algorithm blocking will be done in FIPS_cmac_init, via 84280304Sjkim * FIPS_hmac_init_ex(). 85280304Sjkim */ 86280304Sjkim if (!impl && !ctx->i_ctx.engine) 87280304Sjkim return FIPS_hmac_init_ex(ctx, key, len, md, NULL); 88280304Sjkim } 89238405Sjkim#endif 90284330Sjkim /* If we are changing MD then we must have a key */ 91284330Sjkim if (md != NULL && md != ctx->md && (key == NULL || len < 0)) 92284330Sjkim return 0; 93238405Sjkim 94280304Sjkim if (md != NULL) { 95280304Sjkim reset = 1; 96280304Sjkim ctx->md = md; 97284285Sjkim } else if (ctx->md) { 98280304Sjkim md = ctx->md; 99284285Sjkim } else { 100284285Sjkim return 0; 101284285Sjkim } 10255714Skris 103280304Sjkim if (key != NULL) { 104280304Sjkim reset = 1; 105280304Sjkim j = EVP_MD_block_size(md); 106280304Sjkim OPENSSL_assert(j <= (int)sizeof(ctx->key)); 107280304Sjkim if (j < len) { 108280304Sjkim if (!EVP_DigestInit_ex(&ctx->md_ctx, md, impl)) 109280304Sjkim goto err; 110280304Sjkim if (!EVP_DigestUpdate(&ctx->md_ctx, key, len)) 111280304Sjkim goto err; 112280304Sjkim if (!EVP_DigestFinal_ex(&(ctx->md_ctx), ctx->key, 113280304Sjkim &ctx->key_length)) 114280304Sjkim goto err; 115280304Sjkim } else { 116284285Sjkim if (len < 0 || len > (int)sizeof(ctx->key)) 117284285Sjkim return 0; 118280304Sjkim memcpy(ctx->key, key, len); 119280304Sjkim ctx->key_length = len; 120280304Sjkim } 121280304Sjkim if (ctx->key_length != HMAC_MAX_MD_CBLOCK) 122280304Sjkim memset(&ctx->key[ctx->key_length], 0, 123280304Sjkim HMAC_MAX_MD_CBLOCK - ctx->key_length); 124280304Sjkim } 12555714Skris 126280304Sjkim if (reset) { 127280304Sjkim for (i = 0; i < HMAC_MAX_MD_CBLOCK; i++) 128280304Sjkim pad[i] = 0x36 ^ ctx->key[i]; 129280304Sjkim if (!EVP_DigestInit_ex(&ctx->i_ctx, md, impl)) 130280304Sjkim goto err; 131280304Sjkim if (!EVP_DigestUpdate(&ctx->i_ctx, pad, EVP_MD_block_size(md))) 132280304Sjkim goto err; 13355714Skris 134280304Sjkim for (i = 0; i < HMAC_MAX_MD_CBLOCK; i++) 135280304Sjkim pad[i] = 0x5c ^ ctx->key[i]; 136280304Sjkim if (!EVP_DigestInit_ex(&ctx->o_ctx, md, impl)) 137280304Sjkim goto err; 138280304Sjkim if (!EVP_DigestUpdate(&ctx->o_ctx, pad, EVP_MD_block_size(md))) 139280304Sjkim goto err; 140280304Sjkim } 141280304Sjkim if (!EVP_MD_CTX_copy_ex(&ctx->md_ctx, &ctx->i_ctx)) 142280304Sjkim goto err; 143280304Sjkim return 1; 144280304Sjkim err: 145280304Sjkim return 0; 146280304Sjkim} 14755714Skris 148238405Sjkimint HMAC_Init(HMAC_CTX *ctx, const void *key, int len, const EVP_MD *md) 149280304Sjkim{ 150280304Sjkim if (key && md) 151280304Sjkim HMAC_CTX_init(ctx); 152280304Sjkim return HMAC_Init_ex(ctx, key, len, md, NULL); 153280304Sjkim} 15455714Skris 155238405Sjkimint HMAC_Update(HMAC_CTX *ctx, const unsigned char *data, size_t len) 156280304Sjkim{ 157238405Sjkim#ifdef OPENSSL_FIPS 158280304Sjkim if (FIPS_mode() && !ctx->i_ctx.engine) 159280304Sjkim return FIPS_hmac_update(ctx, data, len); 160238405Sjkim#endif 161284330Sjkim if (!ctx->md) 162284285Sjkim return 0; 163284285Sjkim 164280304Sjkim return EVP_DigestUpdate(&ctx->md_ctx, data, len); 165280304Sjkim} 16655714Skris 167238405Sjkimint HMAC_Final(HMAC_CTX *ctx, unsigned char *md, unsigned int *len) 168280304Sjkim{ 169280304Sjkim unsigned int i; 170280304Sjkim unsigned char buf[EVP_MAX_MD_SIZE]; 171238405Sjkim#ifdef OPENSSL_FIPS 172280304Sjkim if (FIPS_mode() && !ctx->i_ctx.engine) 173280304Sjkim return FIPS_hmac_final(ctx, md, len); 174238405Sjkim#endif 17555714Skris 176284330Sjkim if (!ctx->md) 177284285Sjkim goto err; 178284285Sjkim 179280304Sjkim if (!EVP_DigestFinal_ex(&ctx->md_ctx, buf, &i)) 180280304Sjkim goto err; 181280304Sjkim if (!EVP_MD_CTX_copy_ex(&ctx->md_ctx, &ctx->o_ctx)) 182280304Sjkim goto err; 183280304Sjkim if (!EVP_DigestUpdate(&ctx->md_ctx, buf, i)) 184280304Sjkim goto err; 185280304Sjkim if (!EVP_DigestFinal_ex(&ctx->md_ctx, md, len)) 186280304Sjkim goto err; 187280304Sjkim return 1; 188280304Sjkim err: 189280304Sjkim return 0; 190280304Sjkim} 19155714Skris 192109998Smarkmvoid HMAC_CTX_init(HMAC_CTX *ctx) 193280304Sjkim{ 194280304Sjkim EVP_MD_CTX_init(&ctx->i_ctx); 195280304Sjkim EVP_MD_CTX_init(&ctx->o_ctx); 196280304Sjkim EVP_MD_CTX_init(&ctx->md_ctx); 197284285Sjkim ctx->md = NULL; 198280304Sjkim} 19955714Skris 200238405Sjkimint HMAC_CTX_copy(HMAC_CTX *dctx, HMAC_CTX *sctx) 201280304Sjkim{ 202280304Sjkim if (!EVP_MD_CTX_copy(&dctx->i_ctx, &sctx->i_ctx)) 203280304Sjkim goto err; 204280304Sjkim if (!EVP_MD_CTX_copy(&dctx->o_ctx, &sctx->o_ctx)) 205280304Sjkim goto err; 206280304Sjkim if (!EVP_MD_CTX_copy(&dctx->md_ctx, &sctx->md_ctx)) 207280304Sjkim goto err; 208284330Sjkim memcpy(dctx->key, sctx->key, HMAC_MAX_MD_CBLOCK); 209284330Sjkim dctx->key_length = sctx->key_length; 210280304Sjkim dctx->md = sctx->md; 211280304Sjkim return 1; 212280304Sjkim err: 213280304Sjkim return 0; 214280304Sjkim} 215238405Sjkim 216109998Smarkmvoid HMAC_CTX_cleanup(HMAC_CTX *ctx) 217280304Sjkim{ 218238405Sjkim#ifdef OPENSSL_FIPS 219280304Sjkim if (FIPS_mode() && !ctx->i_ctx.engine) { 220280304Sjkim FIPS_hmac_ctx_cleanup(ctx); 221280304Sjkim return; 222280304Sjkim } 223238405Sjkim#endif 224280304Sjkim EVP_MD_CTX_cleanup(&ctx->i_ctx); 225280304Sjkim EVP_MD_CTX_cleanup(&ctx->o_ctx); 226280304Sjkim EVP_MD_CTX_cleanup(&ctx->md_ctx); 227280304Sjkim memset(ctx, 0, sizeof *ctx); 228280304Sjkim} 229109998Smarkm 23055714Skrisunsigned char *HMAC(const EVP_MD *evp_md, const void *key, int key_len, 231280304Sjkim const unsigned char *d, size_t n, unsigned char *md, 232280304Sjkim unsigned int *md_len) 233280304Sjkim{ 234280304Sjkim HMAC_CTX c; 235280304Sjkim static unsigned char m[EVP_MAX_MD_SIZE]; 23655714Skris 237280304Sjkim if (md == NULL) 238280304Sjkim md = m; 239280304Sjkim HMAC_CTX_init(&c); 240280304Sjkim if (!HMAC_Init(&c, key, key_len, evp_md)) 241280304Sjkim goto err; 242280304Sjkim if (!HMAC_Update(&c, d, n)) 243280304Sjkim goto err; 244280304Sjkim if (!HMAC_Final(&c, md, md_len)) 245280304Sjkim goto err; 246280304Sjkim HMAC_CTX_cleanup(&c); 247280304Sjkim return md; 248280304Sjkim err: 249284285Sjkim HMAC_CTX_cleanup(&c); 250280304Sjkim return NULL; 251280304Sjkim} 25255714Skris 253194206Ssimonvoid HMAC_CTX_set_flags(HMAC_CTX *ctx, unsigned long flags) 254280304Sjkim{ 255280304Sjkim EVP_MD_CTX_set_flags(&ctx->i_ctx, flags); 256280304Sjkim EVP_MD_CTX_set_flags(&ctx->o_ctx, flags); 257280304Sjkim EVP_MD_CTX_set_flags(&ctx->md_ctx, flags); 258280304Sjkim} 259