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hm_pmeth.c

/* 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 <stdio.h>
#include "cryptlib.h"
#include <openssl/x509.h>
#include <openssl/x509v3.h>
#include <openssl/evp.h>
#include <openssl/hmac.h>
#include "evp_locl.h"

/* HMAC pkey context structure */

00068 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;
      hctx = OPENSSL_malloc(sizeof(HMAC_PKEY_CTX));
      if (!hctx)
            return 0;
      hctx->md = NULL;
      hctx->ktmp.data = NULL;
      hctx->ktmp.length = 0;
      hctx->ktmp.flags = 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);
      HMAC_CTX_copy(&dctx->ctx, &sctx->ctx);
      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 = ctx->data;
      HMAC_CTX_cleanup(&hctx->ctx);
      if (hctx->ktmp.data)
            {
            if (hctx->ktmp.length)
                  OPENSSL_cleanse(hctx->ktmp.data, hctx->ktmp.length);
            OPENSSL_free(hctx->ktmp.data);
            hctx->ktmp.data = NULL;
            }
      OPENSSL_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;
      if (!hctx->ktmp.data)
            return 0;
      hkey = ASN1_OCTET_STRING_dup(&hctx->ktmp);
      if (!hkey)
            return 0;
      EVP_PKEY_assign(pkey, EVP_PKEY_HMAC, hkey);
      
      return 1;
      }

static int int_update(EVP_MD_CTX *ctx,const void *data,size_t count)
      {
      HMAC_PKEY_CTX *hctx = ctx->pctx->data;
      HMAC_Update(&hctx->ctx, data, count);
      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;

      HMAC_Final(&hctx->ctx, sig, &hlen);
      *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 = (ASN1_OCTET_STRING *)ctx->pkey->pkey.ptr;
            HMAC_Init_ex(&hctx->ctx, key->data, key->length, hctx->md,
                        ctx->engine);
            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);
            OPENSSL_free(key);
            return r;
            }
      return -2;
      }

const EVP_PKEY_METHOD hmac_pkey_meth = 
      {
      EVP_PKEY_HMAC,
      0,
      pkey_hmac_init,
      pkey_hmac_copy,
      pkey_hmac_cleanup,

      0, 0,

      0,
      pkey_hmac_keygen,

      0, 0,

      0, 0,

      0,0,

      hmac_signctx_init,
      hmac_signctx,

      0,0,

      0,0,

      0,0,

      0,0,

      pkey_hmac_ctrl,
      pkey_hmac_ctrl_str

      };

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