Logo Search packages:      
Sourcecode: openssl version File versions  Download package

fips_rsa_sign.c

/* fips_rsa_sign.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 <string.h>
#include <openssl/evp.h>
#include <openssl/rsa.h>
#include <openssl/err.h>
#include <openssl/sha.h>

#ifdef OPENSSL_FIPS

/* FIPS versions of RSA_sign() and RSA_verify().
 * These will only have to deal with SHA* signatures and by including
 * pregenerated encodings all ASN1 dependencies can be avoided
 */

/* Standard encodings including NULL parameter */

static const unsigned char sha1_bin[] = {
  0x30, 0x21, 0x30, 0x09, 0x06, 0x05, 0x2b, 0x0e, 0x03, 0x02, 0x1a, 0x05,
  0x00, 0x04, 0x14
};

static const unsigned char sha224_bin[] = {
  0x30, 0x2d, 0x30, 0x0d, 0x06, 0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03,
  0x04, 0x02, 0x04, 0x05, 0x00, 0x04, 0x1c
};

static const unsigned char sha256_bin[] = {
  0x30, 0x31, 0x30, 0x0d, 0x06, 0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03,
  0x04, 0x02, 0x01, 0x05, 0x00, 0x04, 0x20
};

static const unsigned char sha384_bin[] = {
  0x30, 0x41, 0x30, 0x0d, 0x06, 0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03,
  0x04, 0x02, 0x02, 0x05, 0x00, 0x04, 0x30
};

static const unsigned char sha512_bin[] = {
  0x30, 0x51, 0x30, 0x0d, 0x06, 0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03,
  0x04, 0x02, 0x03, 0x05, 0x00, 0x04, 0x40
};

/* Alternate encodings with absent parameters. We don't generate signature
 * using this format but do tolerate received signatures of this form.
 */

static unsigned char sha1_nn_bin[] = {
  0x30, 0x1f, 0x30, 0x07, 0x06, 0x05, 0x2b, 0x0e, 0x03, 0x02, 0x1a, 0x04,
  0x14
};

static unsigned char sha224_nn_bin[] = {
  0x30, 0x2b, 0x30, 0x0b, 0x06, 0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03,
  0x04, 0x02, 0x04, 0x04, 0x1c
};

static unsigned char sha256_nn_bin[] = {
  0x30, 0x2f, 0x30, 0x0b, 0x06, 0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03,
  0x04, 0x02, 0x01, 0x04, 0x20
};

static unsigned char sha384_nn_bin[] = {
  0x30, 0x3f, 0x30, 0x0b, 0x06, 0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03,
  0x04, 0x02, 0x02, 0x04, 0x30
};

static unsigned char sha512_nn_bin[] = {
  0x30, 0x4f, 0x30, 0x0b, 0x06, 0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03,
  0x04, 0x02, 0x03, 0x04, 0x40
};


static const unsigned char *fips_digestinfo_encoding(int nid, unsigned int *len)
      {
      switch (nid)
            {

            case NID_sha1:
            *len = sizeof(sha1_bin);
            return sha1_bin;

            case NID_sha224:
            *len = sizeof(sha224_bin);
            return sha224_bin;

            case NID_sha256:
            *len = sizeof(sha256_bin);
            return sha256_bin;

            case NID_sha384:
            *len = sizeof(sha384_bin);
            return sha384_bin;

            case NID_sha512:
            *len = sizeof(sha512_bin);
            return sha512_bin;

            default:
            return NULL;

            }
      }

static const unsigned char *fips_digestinfo_nn_encoding(int nid, unsigned int *len)
      {
      switch (nid)
            {

            case NID_sha1:
            *len = sizeof(sha1_nn_bin);
            return sha1_nn_bin;

            case NID_sha224:
            *len = sizeof(sha224_nn_bin);
            return sha224_nn_bin;

            case NID_sha256:
            *len = sizeof(sha256_nn_bin);
            return sha256_nn_bin;

            case NID_sha384:
            *len = sizeof(sha384_nn_bin);
            return sha384_nn_bin;

            case NID_sha512:
            *len = sizeof(sha512_nn_bin);
            return sha512_nn_bin;

            default:
            return NULL;

            }
      }

static int fips_rsa_sign(int type, const unsigned char *x, unsigned int y,
           unsigned char *sigret, unsigned int *siglen, EVP_MD_SVCTX *sv)
      {
      int i=0,j,ret=0;
      unsigned int dlen;
      const unsigned char *der;
      unsigned int m_len;
      int pad_mode = sv->mctx->flags & EVP_MD_CTX_FLAG_PAD_MASK;
      int rsa_pad_mode = 0;
      RSA *rsa = sv->key;
      /* Largest DigestInfo: 19 (max encoding) + max MD */
      unsigned char tmpdinfo[19 + EVP_MAX_MD_SIZE];
      unsigned char md[EVP_MAX_MD_SIZE + 1];

        EVP_DigestFinal_ex(sv->mctx, md, &m_len);

      if((rsa->flags & RSA_FLAG_SIGN_VER) && rsa->meth->rsa_sign)
            {
            ret = rsa->meth->rsa_sign(type, md, m_len,
                  sigret, siglen, rsa);
            goto done;
            }

      if (pad_mode == EVP_MD_CTX_FLAG_PAD_X931)
            {
            int hash_id;
            memcpy(tmpdinfo, md, m_len);
            hash_id = RSA_X931_hash_id(M_EVP_MD_CTX_type(sv->mctx));
            if (hash_id == -1)
                  {
                  RSAerr(RSA_F_FIPS_RSA_SIGN,RSA_R_UNKNOWN_ALGORITHM_TYPE);
                  return 0;
                  }
            tmpdinfo[m_len] = (unsigned char)hash_id;
            i = m_len + 1;
            rsa_pad_mode = RSA_X931_PADDING;
            }
      else if (pad_mode == EVP_MD_CTX_FLAG_PAD_PKCS1)
            {

            der = fips_digestinfo_encoding(type, &dlen);
            
            if (!der)
                  {
                  RSAerr(RSA_F_FIPS_RSA_SIGN,RSA_R_UNKNOWN_ALGORITHM_TYPE);
                  return 0;
                  }
            memcpy(tmpdinfo, der, dlen);
            memcpy(tmpdinfo + dlen, md, m_len);

            i = dlen + m_len;
            rsa_pad_mode = RSA_PKCS1_PADDING;

            }
      else if (pad_mode == EVP_MD_CTX_FLAG_PAD_PSS)
            {
            unsigned char *sbuf;
            int saltlen;
            i = RSA_size(rsa);
            sbuf = OPENSSL_malloc(RSA_size(rsa));
            saltlen = M_EVP_MD_CTX_FLAG_PSS_SALT(sv->mctx);
            if (saltlen == EVP_MD_CTX_FLAG_PSS_MDLEN)
                  saltlen = -1;
            else if (saltlen == EVP_MD_CTX_FLAG_PSS_MREC)
                  saltlen = -2;
            if (!sbuf)
                  {
                  RSAerr(RSA_F_FIPS_RSA_SIGN,ERR_R_MALLOC_FAILURE);
                  goto psserr;
                  }
            if (!RSA_padding_add_PKCS1_PSS(rsa, sbuf, md,
                              M_EVP_MD_CTX_md(sv->mctx), saltlen))
                  goto psserr;
            j=rsa->meth->rsa_priv_enc(i,sbuf,sigret,rsa,RSA_NO_PADDING);
            if (j > 0)
                  {
                  ret=1;
                  *siglen=j;
                  }
            psserr:
            OPENSSL_cleanse(md,m_len);
            OPENSSL_cleanse(sbuf, i);
            OPENSSL_free(sbuf);
            return ret;
            }

      j=RSA_size(rsa);
      if (i > (j-RSA_PKCS1_PADDING_SIZE))
            {
            RSAerr(RSA_F_FIPS_RSA_SIGN,RSA_R_DIGEST_TOO_BIG_FOR_RSA_KEY);
            goto done;
            }
      /* NB: call underlying method directly to avoid FIPS blocking */
      j=rsa->meth->rsa_priv_enc(i,tmpdinfo,sigret,rsa,rsa_pad_mode);
      if (j > 0)
            {
            ret=1;
            *siglen=j;
            }

      done:
      OPENSSL_cleanse(tmpdinfo,i);
      OPENSSL_cleanse(md,m_len);
      return ret;
      }

static int fips_rsa_verify(int dtype,
            const unsigned char *x, unsigned int y,
            unsigned char *sigbuf, unsigned int siglen, EVP_MD_SVCTX *sv)
      {
      int i,ret=0;
      unsigned int dlen, diglen;
      int pad_mode = sv->mctx->flags & EVP_MD_CTX_FLAG_PAD_MASK;
      int rsa_pad_mode = 0;
      unsigned char *s;
      const unsigned char *der;
      unsigned char dig[EVP_MAX_MD_SIZE];
      RSA *rsa = sv->key;

      if (siglen != (unsigned int)RSA_size(sv->key))
            {
            RSAerr(RSA_F_FIPS_RSA_VERIFY,RSA_R_WRONG_SIGNATURE_LENGTH);
            return(0);
            }

        EVP_DigestFinal_ex(sv->mctx, dig, &diglen);

      if((rsa->flags & RSA_FLAG_SIGN_VER) && rsa->meth->rsa_verify)
            {
            return rsa->meth->rsa_verify(dtype, dig, diglen,
                  sigbuf, siglen, rsa);
            }


      s= OPENSSL_malloc((unsigned int)siglen);
      if (s == NULL)
            {
            RSAerr(RSA_F_FIPS_RSA_VERIFY,ERR_R_MALLOC_FAILURE);
            goto err;
            }
      if (pad_mode == EVP_MD_CTX_FLAG_PAD_X931)
            rsa_pad_mode = RSA_X931_PADDING;
      else if (pad_mode == EVP_MD_CTX_FLAG_PAD_PKCS1)
            rsa_pad_mode = RSA_PKCS1_PADDING;
      else if (pad_mode == EVP_MD_CTX_FLAG_PAD_PSS)
            rsa_pad_mode = RSA_NO_PADDING;

      /* NB: call underlying method directly to avoid FIPS blocking */
      i=rsa->meth->rsa_pub_dec((int)siglen,sigbuf,s, rsa, rsa_pad_mode);

      if (i <= 0) goto err;

      if (pad_mode == EVP_MD_CTX_FLAG_PAD_X931)
            {
            int hash_id;
            if (i != (int)(diglen + 1))
                  {
                  RSAerr(RSA_F_FIPS_RSA_VERIFY,RSA_R_BAD_SIGNATURE);
                  goto err;
                  }
            hash_id = RSA_X931_hash_id(M_EVP_MD_CTX_type(sv->mctx));
            if (hash_id == -1)
                  {
                  RSAerr(RSA_F_FIPS_RSA_VERIFY,RSA_R_UNKNOWN_ALGORITHM_TYPE);
                  goto err;
                  }
            if (s[diglen] != (unsigned char)hash_id)
                  {
                  RSAerr(RSA_F_FIPS_RSA_VERIFY,RSA_R_BAD_SIGNATURE);
                  goto err;
                  }
            if (memcmp(s, dig, diglen))
                  {
                  RSAerr(RSA_F_FIPS_RSA_VERIFY,RSA_R_BAD_SIGNATURE);
                  goto err;
                  }
            ret = 1;
            }
      else if (pad_mode == EVP_MD_CTX_FLAG_PAD_PKCS1)
            {

            der = fips_digestinfo_encoding(dtype, &dlen);
            
            if (!der)
                  {
                  RSAerr(RSA_F_FIPS_RSA_VERIFY,RSA_R_UNKNOWN_ALGORITHM_TYPE);
                  return(0);
                  }

            /* Compare, DigestInfo length, DigestInfo header and finally
             * digest value itself
             */

            /* If length mismatch try alternate encoding */
            if (i != (int)(dlen + diglen))
                  der = fips_digestinfo_nn_encoding(dtype, &dlen);

            if ((i != (int)(dlen + diglen)) || memcmp(der, s, dlen)
                  || memcmp(s + dlen, dig, diglen))
                  {
                  RSAerr(RSA_F_FIPS_RSA_VERIFY,RSA_R_BAD_SIGNATURE);
                  goto err;
                  }
            ret = 1;

            }
      else if (pad_mode == EVP_MD_CTX_FLAG_PAD_PSS)
            {
            int saltlen;
            saltlen = M_EVP_MD_CTX_FLAG_PSS_SALT(sv->mctx);
            if (saltlen == EVP_MD_CTX_FLAG_PSS_MDLEN)
                  saltlen = -1;
            else if (saltlen == EVP_MD_CTX_FLAG_PSS_MREC)
                  saltlen = -2;
            ret = RSA_verify_PKCS1_PSS(rsa, dig, M_EVP_MD_CTX_md(sv->mctx),
                                    s, saltlen);
            if (ret < 0)
                  ret = 0;
            }
err:
      if (s != NULL)
            {
            OPENSSL_cleanse(s, siglen);
            OPENSSL_free(s);
            }
      return(ret);
      }

#define EVP_PKEY_RSA_fips_method \
                        (evp_sign_method *)fips_rsa_sign, \
                        (evp_verify_method *)fips_rsa_verify, \
                        {EVP_PKEY_RSA,EVP_PKEY_RSA2,0,0}

static int init(EVP_MD_CTX *ctx)
      { return SHA1_Init(ctx->md_data); }

static int update(EVP_MD_CTX *ctx,const void *data,size_t count)
      { return SHA1_Update(ctx->md_data,data,count); }

static int final(EVP_MD_CTX *ctx,unsigned char *md)
      { return SHA1_Final(md,ctx->md_data); }

static const EVP_MD sha1_md=
      {
      NID_sha1,
      NID_sha1WithRSAEncryption,
      SHA_DIGEST_LENGTH,
      EVP_MD_FLAG_FIPS|EVP_MD_FLAG_SVCTX,
      init,
      update,
      final,
      NULL,
      NULL,
      EVP_PKEY_RSA_fips_method,
      SHA_CBLOCK,
      sizeof(EVP_MD *)+sizeof(SHA_CTX),
      };

const EVP_MD *EVP_sha1(void)
      {
      return(&sha1_md);
      }

static int init224(EVP_MD_CTX *ctx)
      { return SHA224_Init(ctx->md_data); }
static int init256(EVP_MD_CTX *ctx)
      { return SHA256_Init(ctx->md_data); }
/*
 * Even though there're separate SHA224_[Update|Final], we call
 * SHA256 functions even in SHA224 context. This is what happens
 * there anyway, so we can spare few CPU cycles:-)
 */
static int update256(EVP_MD_CTX *ctx,const void *data,size_t count)
      { return SHA256_Update(ctx->md_data,data,count); }
static int final256(EVP_MD_CTX *ctx,unsigned char *md)
      { return SHA256_Final(md,ctx->md_data); }

static const EVP_MD sha224_md=
      {
      NID_sha224,
      NID_sha224WithRSAEncryption,
      SHA224_DIGEST_LENGTH,
      EVP_MD_FLAG_FIPS|EVP_MD_FLAG_SVCTX,
      init224,
      update256,
      final256,
      NULL,
      NULL,
      EVP_PKEY_RSA_fips_method,
      SHA256_CBLOCK,
      sizeof(EVP_MD *)+sizeof(SHA256_CTX),
      };

const EVP_MD *EVP_sha224(void)
      { return(&sha224_md); }

static const EVP_MD sha256_md=
      {
      NID_sha256,
      NID_sha256WithRSAEncryption,
      SHA256_DIGEST_LENGTH,
      EVP_MD_FLAG_FIPS|EVP_MD_FLAG_SVCTX,
      init256,
      update256,
      final256,
      NULL,
      NULL,
      EVP_PKEY_RSA_fips_method,
      SHA256_CBLOCK,
      sizeof(EVP_MD *)+sizeof(SHA256_CTX),
      };

const EVP_MD *EVP_sha256(void)
      { return(&sha256_md); }

static int init384(EVP_MD_CTX *ctx)
      { return SHA384_Init(ctx->md_data); }
static int init512(EVP_MD_CTX *ctx)
      { return SHA512_Init(ctx->md_data); }
/* See comment in SHA224/256 section */
static int update512(EVP_MD_CTX *ctx,const void *data,size_t count)
      { return SHA512_Update(ctx->md_data,data,count); }
static int final512(EVP_MD_CTX *ctx,unsigned char *md)
      { return SHA512_Final(md,ctx->md_data); }

static const EVP_MD sha384_md=
      {
      NID_sha384,
      NID_sha384WithRSAEncryption,
      SHA384_DIGEST_LENGTH,
      EVP_MD_FLAG_FIPS|EVP_MD_FLAG_SVCTX,
      init384,
      update512,
      final512,
      NULL,
      NULL,
      EVP_PKEY_RSA_fips_method,
      SHA512_CBLOCK,
      sizeof(EVP_MD *)+sizeof(SHA512_CTX),
      };

const EVP_MD *EVP_sha384(void)
      { return(&sha384_md); }

static const EVP_MD sha512_md=
      {
      NID_sha512,
      NID_sha512WithRSAEncryption,
      SHA512_DIGEST_LENGTH,
      EVP_MD_FLAG_FIPS|EVP_MD_FLAG_SVCTX,
      init512,
      update512,
      final512,
      NULL,
      NULL,
      EVP_PKEY_RSA_fips_method,
      SHA512_CBLOCK,
      sizeof(EVP_MD *)+sizeof(SHA512_CTX),
      };

const EVP_MD *EVP_sha512(void)
      { return(&sha512_md); }

#endif

Generated by  Doxygen 1.6.0   Back to index