266 lines
7.1 KiB
C
266 lines
7.1 KiB
C
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/*
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* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
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* 2007.
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*/
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/* ====================================================================
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* Copyright (c) 2007 The OpenSSL Project. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. All advertising materials mentioning features or use of this
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* software must display the following acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
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*
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* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
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* endorse or promote products derived from this software without
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* prior written permission. For written permission, please contact
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* licensing@OpenSSL.org.
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*
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* 5. Products derived from this software may not be called "OpenSSL"
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* nor may "OpenSSL" appear in their names without prior written
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* permission of the OpenSSL Project.
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*
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* 6. Redistributions of any form whatsoever must retain the following
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* acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
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*
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* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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* ====================================================================
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*
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* This product includes cryptographic software written by Eric Young
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* (eay@cryptsoft.com). This product includes software written by Tim
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* Hudson (tjh@cryptsoft.com).
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*
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*/
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#include <stdio.h>
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#include "cryptlib.h"
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#include <openssl/x509.h>
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#include <openssl/x509v3.h>
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#include <openssl/evp.h>
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#include <openssl/hmac.h>
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#include "evp_locl.h"
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/* HMAC pkey context structure */
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typedef struct {
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const EVP_MD *md; /* MD for HMAC use */
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ASN1_OCTET_STRING ktmp; /* Temp storage for key */
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HMAC_CTX ctx;
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} HMAC_PKEY_CTX;
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static int pkey_hmac_init(EVP_PKEY_CTX *ctx)
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{
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HMAC_PKEY_CTX *hctx;
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hctx = OPENSSL_malloc(sizeof(HMAC_PKEY_CTX));
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if (!hctx)
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return 0;
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hctx->md = NULL;
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hctx->ktmp.data = NULL;
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hctx->ktmp.length = 0;
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hctx->ktmp.flags = 0;
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hctx->ktmp.type = V_ASN1_OCTET_STRING;
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HMAC_CTX_init(&hctx->ctx);
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ctx->data = hctx;
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ctx->keygen_info_count = 0;
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return 1;
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}
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static int pkey_hmac_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src)
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{
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HMAC_PKEY_CTX *sctx, *dctx;
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if (!pkey_hmac_init(dst))
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return 0;
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sctx = src->data;
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dctx = dst->data;
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dctx->md = sctx->md;
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if (!HMAC_CTX_copy(&dctx->ctx, &sctx->ctx))
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goto err;
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if (sctx->ktmp.data != NULL) {
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if (!ASN1_OCTET_STRING_set(&dctx->ktmp,
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sctx->ktmp.data, sctx->ktmp.length))
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goto err;
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}
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return 1;
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err:
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HMAC_CTX_cleanup(&dctx->ctx);
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OPENSSL_free(dctx);
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return 0;
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}
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static void pkey_hmac_cleanup(EVP_PKEY_CTX *ctx)
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{
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HMAC_PKEY_CTX *hctx = ctx->data;
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HMAC_CTX_cleanup(&hctx->ctx);
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if (hctx->ktmp.data) {
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if (hctx->ktmp.length)
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OPENSSL_cleanse(hctx->ktmp.data, hctx->ktmp.length);
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OPENSSL_free(hctx->ktmp.data);
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hctx->ktmp.data = NULL;
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}
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OPENSSL_free(hctx);
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}
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static int pkey_hmac_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
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{
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ASN1_OCTET_STRING *hkey = NULL;
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HMAC_PKEY_CTX *hctx = ctx->data;
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if (!hctx->ktmp.data)
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return 0;
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hkey = ASN1_OCTET_STRING_dup(&hctx->ktmp);
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if (!hkey)
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return 0;
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EVP_PKEY_assign(pkey, EVP_PKEY_HMAC, hkey);
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return 1;
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}
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static int int_update(EVP_MD_CTX *ctx, const void *data, size_t count)
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{
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HMAC_PKEY_CTX *hctx = ctx->pctx->data;
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if (!HMAC_Update(&hctx->ctx, data, count))
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return 0;
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return 1;
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}
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static int hmac_signctx_init(EVP_PKEY_CTX *ctx, EVP_MD_CTX *mctx)
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{
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HMAC_PKEY_CTX *hctx = ctx->data;
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HMAC_CTX_set_flags(&hctx->ctx, mctx->flags & ~EVP_MD_CTX_FLAG_NO_INIT);
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EVP_MD_CTX_set_flags(mctx, EVP_MD_CTX_FLAG_NO_INIT);
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mctx->update = int_update;
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return 1;
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}
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static int hmac_signctx(EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *siglen,
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EVP_MD_CTX *mctx)
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{
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unsigned int hlen;
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HMAC_PKEY_CTX *hctx = ctx->data;
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int l = EVP_MD_CTX_size(mctx);
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if (l < 0)
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return 0;
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*siglen = l;
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if (!sig)
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return 1;
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if (!HMAC_Final(&hctx->ctx, sig, &hlen))
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return 0;
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*siglen = (size_t)hlen;
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return 1;
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}
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static int pkey_hmac_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
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{
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HMAC_PKEY_CTX *hctx = ctx->data;
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ASN1_OCTET_STRING *key;
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switch (type) {
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case EVP_PKEY_CTRL_SET_MAC_KEY:
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if ((!p2 && p1 > 0) || (p1 < -1))
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return 0;
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if (!ASN1_OCTET_STRING_set(&hctx->ktmp, p2, p1))
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return 0;
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break;
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case EVP_PKEY_CTRL_MD:
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hctx->md = p2;
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break;
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case EVP_PKEY_CTRL_DIGESTINIT:
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key = (ASN1_OCTET_STRING *)ctx->pkey->pkey.ptr;
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if (!HMAC_Init_ex(&hctx->ctx, key->data, key->length, hctx->md,
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ctx->engine))
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return 0;
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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 pkey_hmac_ctrl_str(EVP_PKEY_CTX *ctx,
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const char *type, const char *value)
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{
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if (!value) {
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return 0;
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}
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if (!strcmp(type, "key")) {
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void *p = (void *)value;
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return pkey_hmac_ctrl(ctx, EVP_PKEY_CTRL_SET_MAC_KEY, -1, p);
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}
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if (!strcmp(type, "hexkey")) {
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unsigned char *key;
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int r;
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long keylen;
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key = string_to_hex(value, &keylen);
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if (!key)
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return 0;
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r = pkey_hmac_ctrl(ctx, EVP_PKEY_CTRL_SET_MAC_KEY, keylen, key);
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OPENSSL_free(key);
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return r;
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}
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return -2;
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}
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const EVP_PKEY_METHOD hmac_pkey_meth = {
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EVP_PKEY_HMAC,
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0,
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pkey_hmac_init,
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pkey_hmac_copy,
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pkey_hmac_cleanup,
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0, 0,
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0,
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pkey_hmac_keygen,
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0, 0,
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0, 0,
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0, 0,
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hmac_signctx_init,
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hmac_signctx,
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0, 0,
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0, 0,
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0, 0,
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0, 0,
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pkey_hmac_ctrl,
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pkey_hmac_ctrl_str
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};
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