/* fips/rand/fips_drbg_hmac.c */ /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL * project. */ /* ==================================================================== * Copyright (c) 2011 The OpenSSL Project. 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. All advertising materials mentioning features or use of this * software must display the following acknowledgment: * "This product includes software developed by the OpenSSL Project * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" * * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to * endorse or promote products derived from this software without * prior written permission. For written permission, please contact * licensing@OpenSSL.org. * * 5. Products derived from this software may not be called "OpenSSL" * nor may "OpenSSL" appear in their names without prior written * permission of the OpenSSL Project. * * 6. Redistributions of any form whatsoever must retain the following * acknowledgment: * "This product includes software developed by the OpenSSL Project * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" * * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY * EXPRESSED 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 OpenSSL PROJECT OR * ITS 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 #include #include #include #include #include #include #include #include "fips_rand_lcl.h" static int drbg_hmac_update(DRBG_CTX *dctx, const unsigned char *in1, size_t in1len, const unsigned char *in2, size_t in2len, const unsigned char *in3, size_t in3len) { static unsigned char c0 = 0, c1 = 1; DRBG_HMAC_CTX *hmac = &dctx->d.hmac; HMAC_CTX *hctx = hmac->hctx; if (!HMAC_Init_ex(hctx, hmac->K, dctx->blocklength, hmac->md, NULL)) return 0; if (!HMAC_Update(hctx, hmac->V, dctx->blocklength)) return 0; if (!HMAC_Update(hctx, &c0, 1)) return 0; if (in1len && !HMAC_Update(hctx, in1, in1len)) return 0; if (in2len && !HMAC_Update(hctx, in2, in2len)) return 0; if (in3len && !HMAC_Update(hctx, in3, in3len)) return 0; if (!HMAC_Final(hctx, hmac->K, NULL)) return 0; if (!HMAC_Init_ex(hctx, hmac->K, dctx->blocklength, hmac->md, NULL)) return 0; if (!HMAC_Update(hctx, hmac->V, dctx->blocklength)) return 0; if (!HMAC_Final(hctx, hmac->V, NULL)) return 0; if (!in1len && !in2len && !in3len) return 1; if (!HMAC_Init_ex(hctx, hmac->K, dctx->blocklength, hmac->md, NULL)) return 0; if (!HMAC_Update(hctx, hmac->V, dctx->blocklength)) return 0; if (!HMAC_Update(hctx, &c1, 1)) return 0; if (in1len && !HMAC_Update(hctx, in1, in1len)) return 0; if (in2len && !HMAC_Update(hctx, in2, in2len)) return 0; if (in3len && !HMAC_Update(hctx, in3, in3len)) return 0; if (!HMAC_Final(hctx, hmac->K, NULL)) return 0; if (!HMAC_Init_ex(hctx, hmac->K, dctx->blocklength, hmac->md, NULL)) return 0; if (!HMAC_Update(hctx, hmac->V, dctx->blocklength)) return 0; if (!HMAC_Final(hctx, hmac->V, NULL)) return 0; return 1; } static int drbg_hmac_instantiate(DRBG_CTX *dctx, const unsigned char *ent, size_t ent_len, const unsigned char *nonce, size_t nonce_len, const unsigned char *pstr, size_t pstr_len) { DRBG_HMAC_CTX *hmac = &dctx->d.hmac; memset(hmac->K, 0, dctx->blocklength); memset(hmac->V, 1, dctx->blocklength); if (!drbg_hmac_update(dctx, ent, ent_len, nonce, nonce_len, pstr, pstr_len)) return 0; #ifdef HMAC_DRBG_TRACE fprintf(stderr, "K+V after instantiate:\n"); hexprint(stderr, hmac->K, hmac->blocklength); hexprint(stderr, hmac->V, hmac->blocklength); #endif return 1; } static int drbg_hmac_reseed(DRBG_CTX *dctx, const unsigned char *ent, size_t ent_len, const unsigned char *adin, size_t adin_len) { if (!drbg_hmac_update(dctx, ent, ent_len, adin, adin_len, NULL, 0)) return 0; #ifdef HMAC_DRBG_TRACE { DRBG_HMAC_CTX *hmac = &dctx->d.hmac; fprintf(stderr, "K+V after reseed:\n"); hexprint(stderr, hmac->K, hmac->blocklength); hexprint(stderr, hmac->V, hmac->blocklength); } #endif return 1; } static int drbg_hmac_generate(DRBG_CTX *dctx, unsigned char *out, size_t outlen, const unsigned char *adin, size_t adin_len) { DRBG_HMAC_CTX *hmac = &dctx->d.hmac; HMAC_CTX *hctx = hmac->hctx; const unsigned char *Vtmp = hmac->V; if (adin_len && !drbg_hmac_update(dctx, adin, adin_len, NULL, 0, NULL, 0)) return 0; for (;;) { if (!HMAC_Init_ex(hctx, hmac->K, dctx->blocklength, hmac->md, NULL)) return 0; if (!HMAC_Update(hctx, Vtmp, dctx->blocklength)) return 0; if (outlen > dctx->blocklength) { if (!HMAC_Final(hctx, out, NULL)) return 0; Vtmp = out; } else { if (!HMAC_Final(hctx, hmac->V, NULL)) return 0; memcpy(out, hmac->V, outlen); break; } out += dctx->blocklength; outlen -= dctx->blocklength; } if (!drbg_hmac_update(dctx, adin, adin_len, NULL, 0, NULL, 0)) return 0; return 1; } static int drbg_hmac_uninstantiate(DRBG_CTX *dctx) { HMAC_CTX_free(dctx->d.hmac.hctx); OPENSSL_cleanse(&dctx->d.hmac, sizeof(DRBG_HMAC_CTX)); return 1; } int fips_drbg_hmac_init(DRBG_CTX *dctx) { const EVP_MD *md = NULL; DRBG_HMAC_CTX *hctx = &dctx->d.hmac; dctx->strength = 256; switch (dctx->type) { case NID_hmacWithSHA1: md = EVP_sha1(); dctx->strength = 128; break; case NID_hmacWithSHA224: md = EVP_sha224(); dctx->strength = 192; break; case NID_hmacWithSHA256: md = EVP_sha256(); break; case NID_hmacWithSHA384: md = EVP_sha384(); break; case NID_hmacWithSHA512: md = EVP_sha512(); break; default: dctx->strength = 0; return -2; } dctx->instantiate = drbg_hmac_instantiate; dctx->reseed = drbg_hmac_reseed; dctx->generate = drbg_hmac_generate; dctx->uninstantiate = drbg_hmac_uninstantiate; hctx->hctx = HMAC_CTX_new(); if (hctx->hctx == NULL) return -1; hctx->md = md; dctx->blocklength = M_EVP_MD_size(md); dctx->seedlen = M_EVP_MD_size(md); dctx->min_entropy = dctx->strength / 8; dctx->max_entropy = DRBG_MAX_LENGTH; dctx->min_nonce = dctx->min_entropy / 2; dctx->max_nonce = DRBG_MAX_LENGTH; dctx->max_pers = DRBG_MAX_LENGTH; dctx->max_adin = DRBG_MAX_LENGTH; dctx->max_request = 1 << 16; dctx->reseed_interval = 1 << 24; return 1; }