/* $OpenBSD: hm_pmeth.c,v 1.17 2023/12/28 22:00:56 tb Exp $ */ /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL * project 2007. */ /* ==================================================================== * Copyright (c) 2007 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. * ==================================================================== * * This product includes cryptographic software written by Eric Young * (eay@cryptsoft.com). This product includes software written by Tim * Hudson (tjh@cryptsoft.com). * */ #include #include #include #include #include #include #include "evp_local.h" #include "hmac_local.h" /* HMAC pkey context structure */ typedef struct { const EVP_MD *md; /* MD for HMAC use */ ASN1_OCTET_STRING ktmp; /* Temp storage for key */ HMAC_CTX ctx; } HMAC_PKEY_CTX; static int pkey_hmac_init(EVP_PKEY_CTX *ctx) { HMAC_PKEY_CTX *hctx; if ((hctx = calloc(1, sizeof(HMAC_PKEY_CTX))) == NULL) return 0; hctx->ktmp.type = V_ASN1_OCTET_STRING; HMAC_CTX_init(&hctx->ctx); ctx->data = hctx; ctx->keygen_info_count = 0; return 1; } static int pkey_hmac_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src) { HMAC_PKEY_CTX *sctx, *dctx; if (!pkey_hmac_init(dst)) return 0; sctx = src->data; dctx = dst->data; dctx->md = sctx->md; HMAC_CTX_init(&dctx->ctx); if (!HMAC_CTX_copy(&dctx->ctx, &sctx->ctx)) return 0; if (sctx->ktmp.data) { if (!ASN1_OCTET_STRING_set(&dctx->ktmp, sctx->ktmp.data, sctx->ktmp.length)) return 0; } return 1; } static void pkey_hmac_cleanup(EVP_PKEY_CTX *ctx) { HMAC_PKEY_CTX *hctx; if ((hctx = ctx->data) == NULL) return; HMAC_CTX_cleanup(&hctx->ctx); freezero(hctx->ktmp.data, hctx->ktmp.length); free(hctx); } static int pkey_hmac_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey) { ASN1_OCTET_STRING *hkey = NULL; HMAC_PKEY_CTX *hctx = ctx->data; int ret = 0; if (hctx->ktmp.data == NULL) goto err; if ((hkey = ASN1_OCTET_STRING_dup(&hctx->ktmp)) == NULL) goto err; if (!EVP_PKEY_assign(pkey, EVP_PKEY_HMAC, hkey)) goto err; hkey = NULL; ret = 1; err: ASN1_OCTET_STRING_free(hkey); return ret; } static int int_update(EVP_MD_CTX *ctx, const void *data, size_t count) { HMAC_PKEY_CTX *hctx = ctx->pctx->data; if (!HMAC_Update(&hctx->ctx, data, count)) return 0; return 1; } static int hmac_signctx_init(EVP_PKEY_CTX *ctx, EVP_MD_CTX *mctx) { HMAC_PKEY_CTX *hctx = ctx->data; HMAC_CTX_set_flags(&hctx->ctx, mctx->flags & ~EVP_MD_CTX_FLAG_NO_INIT); EVP_MD_CTX_set_flags(mctx, EVP_MD_CTX_FLAG_NO_INIT); mctx->update = int_update; return 1; } static int hmac_signctx(EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *siglen, EVP_MD_CTX *mctx) { unsigned int hlen; HMAC_PKEY_CTX *hctx = ctx->data; int l = EVP_MD_CTX_size(mctx); if (l < 0) return 0; *siglen = l; if (!sig) return 1; if (!HMAC_Final(&hctx->ctx, sig, &hlen)) return 0; *siglen = (size_t)hlen; return 1; } static int pkey_hmac_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2) { HMAC_PKEY_CTX *hctx = ctx->data; ASN1_OCTET_STRING *key; switch (type) { case EVP_PKEY_CTRL_SET_MAC_KEY: if ((!p2 && p1 > 0) || (p1 < -1)) return 0; if (!ASN1_OCTET_STRING_set(&hctx->ktmp, p2, p1)) return 0; break; case EVP_PKEY_CTRL_MD: hctx->md = p2; break; case EVP_PKEY_CTRL_DIGESTINIT: key = ctx->pkey->pkey.ptr; if (!HMAC_Init_ex(&hctx->ctx, key->data, key->length, hctx->md, NULL)) return 0; break; default: return -2; } return 1; } static int pkey_hmac_ctrl_str(EVP_PKEY_CTX *ctx, const char *type, const char *value) { if (!value) return 0; if (!strcmp(type, "key")) { void *p = (void *)value; return pkey_hmac_ctrl(ctx, EVP_PKEY_CTRL_SET_MAC_KEY, -1, p); } if (!strcmp(type, "hexkey")) { unsigned char *key; int r; long keylen; key = string_to_hex(value, &keylen); if (!key) return 0; r = pkey_hmac_ctrl(ctx, EVP_PKEY_CTRL_SET_MAC_KEY, keylen, key); free(key); return r; } return -2; } const EVP_PKEY_METHOD hmac_pkey_meth = { .pkey_id = EVP_PKEY_HMAC, .init = pkey_hmac_init, .copy = pkey_hmac_copy, .cleanup = pkey_hmac_cleanup, .keygen = pkey_hmac_keygen, .signctx_init = hmac_signctx_init, .signctx = hmac_signctx, .ctrl = pkey_hmac_ctrl, .ctrl_str = pkey_hmac_ctrl_str };