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rsa_pmeth.c

/* crypto/rsa/rsa_pmeth.c */
/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
 * project 2006.
 */
/* ====================================================================
 * Copyright (c) 2006 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/asn1t.h>
#include <openssl/x509.h>
#include <openssl/rsa.h>
#include <openssl/bn.h>
#include <openssl/evp.h>
#include "evp_locl.h"
#include "rsa_locl.h"

/* RSA pkey context structure */

00071 typedef struct
      {
      /* Key gen parameters */
      int nbits;
      BIGNUM *pub_exp;
      /* Keygen callback info */
      int gentmp[2];
      /* RSA padding mode */
      int pad_mode;
      /* message digest */
      const EVP_MD *md;
      /* PSS/OAEP salt length */
      int saltlen;
      /* Temp buffer */
      unsigned char *tbuf;
      } RSA_PKEY_CTX;

static int pkey_rsa_init(EVP_PKEY_CTX *ctx)
      {
      RSA_PKEY_CTX *rctx;
      rctx = OPENSSL_malloc(sizeof(RSA_PKEY_CTX));
      if (!rctx)
            return 0;
      rctx->nbits = 1024;
      rctx->pub_exp = NULL;
      rctx->pad_mode = RSA_PKCS1_PADDING;
      rctx->md = NULL;
      rctx->tbuf = NULL;

      rctx->saltlen = -2;

      ctx->data = rctx;
      ctx->keygen_info = rctx->gentmp;
      ctx->keygen_info_count = 2;
      
      return 1;
      }

static int pkey_rsa_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src)
      {
      RSA_PKEY_CTX *dctx, *sctx;
      if (!pkey_rsa_init(dst))
            return 0;
            sctx = src->data;
      dctx = dst->data;
      dctx->nbits = sctx->nbits;
      if (sctx->pub_exp)
            {
            dctx->pub_exp = BN_dup(sctx->pub_exp);
            if (!dctx->pub_exp)
                  return 0;
            }
      dctx->pad_mode = sctx->pad_mode;
      dctx->md = sctx->md;
      return 1;
      }

static int setup_tbuf(RSA_PKEY_CTX *ctx, EVP_PKEY_CTX *pk)
      {
      if (ctx->tbuf)
            return 1;
      ctx->tbuf = OPENSSL_malloc(EVP_PKEY_size(pk->pkey));
      if (!ctx->tbuf)
            return 0;
      return 1;
      }

static void pkey_rsa_cleanup(EVP_PKEY_CTX *ctx)
      {
      RSA_PKEY_CTX *rctx = ctx->data;
      if (rctx)
            {
            if (rctx->pub_exp)
                  BN_free(rctx->pub_exp);
            if (rctx->tbuf)
                  OPENSSL_free(rctx->tbuf);
            OPENSSL_free(rctx);
            }
      }

static int pkey_rsa_sign(EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *siglen,
                              const unsigned char *tbs, size_t tbslen)
      {
      int ret;
      RSA_PKEY_CTX *rctx = ctx->data;
      RSA *rsa = ctx->pkey->pkey.rsa;

      if (rctx->md)
            {
            if (tbslen != (size_t)EVP_MD_size(rctx->md))
                  {
                  RSAerr(RSA_F_PKEY_RSA_SIGN,
                              RSA_R_INVALID_DIGEST_LENGTH);
                  return -1;
                  }
            if (rctx->pad_mode == RSA_X931_PADDING)
                  {
                  if (!setup_tbuf(rctx, ctx))
                        return -1;
                  memcpy(rctx->tbuf, tbs, tbslen);
                  rctx->tbuf[tbslen] =
                        RSA_X931_hash_id(EVP_MD_type(rctx->md));
                  ret = RSA_private_encrypt(tbslen + 1, rctx->tbuf,
                                    sig, rsa, RSA_X931_PADDING);
                  }
            else if (rctx->pad_mode == RSA_PKCS1_PADDING)
                  {
                  unsigned int sltmp;
                  ret = RSA_sign(EVP_MD_type(rctx->md),
                                    tbs, tbslen, sig, &sltmp, rsa);
                  if (ret <= 0)
                        return ret;
                  ret = sltmp;
                  }
            else if (rctx->pad_mode == RSA_PKCS1_PSS_PADDING)
                  {
                  if (!setup_tbuf(rctx, ctx))
                        return -1;
                  if (!RSA_padding_add_PKCS1_PSS(rsa, rctx->tbuf, tbs,
                                    rctx->md, rctx->saltlen))
                        return -1;
                  ret = RSA_private_encrypt(RSA_size(rsa), rctx->tbuf,
                                    sig, rsa, RSA_NO_PADDING);
                  }
            else
                  return -1;
            }
      else
            ret = RSA_private_encrypt(tbslen, tbs, sig, ctx->pkey->pkey.rsa,
                                          rctx->pad_mode);
      if (ret < 0)
            return ret;
      *siglen = ret;
      return 1;
      }


static int pkey_rsa_verifyrecover(EVP_PKEY_CTX *ctx,
                              unsigned char *rout, size_t *routlen,
                              const unsigned char *sig, size_t siglen)
      {
      int ret;
      RSA_PKEY_CTX *rctx = ctx->data;

      if (rctx->md)
            {
            if (rctx->pad_mode == RSA_X931_PADDING)
                  {
                  if (!setup_tbuf(rctx, ctx))
                        return -1;
                  ret = RSA_public_decrypt(siglen, sig,
                                    rctx->tbuf, ctx->pkey->pkey.rsa,
                                    RSA_X931_PADDING);
                  if (ret < 1)
                        return 0;
                  ret--;
                  if (rctx->tbuf[ret] !=
                        RSA_X931_hash_id(EVP_MD_type(rctx->md)))
                        {
                        RSAerr(RSA_F_PKEY_RSA_VERIFYRECOVER,
                                    RSA_R_ALGORITHM_MISMATCH);
                        return 0;
                        }
                  if (ret != EVP_MD_size(rctx->md))
                        {
                        RSAerr(RSA_F_PKEY_RSA_VERIFYRECOVER,
                              RSA_R_INVALID_DIGEST_LENGTH);
                        return 0;
                        }
                  if (rout)
                        memcpy(rout, rctx->tbuf, ret);
                  }
            else if (rctx->pad_mode == RSA_PKCS1_PADDING)
                  {
                  size_t sltmp;
                  ret = int_rsa_verify(EVP_MD_type(rctx->md),
                                    NULL, 0, rout, &sltmp,
                              sig, siglen, ctx->pkey->pkey.rsa);
                  if (ret <= 0)
                        return 0;
                  ret = sltmp;
                  }
            else
                  return -1;
            }
      else
            ret = RSA_public_decrypt(siglen, sig, rout, ctx->pkey->pkey.rsa,
                                          rctx->pad_mode);
      if (ret < 0)
            return ret;
      *routlen = ret;
      return 1;
      }

static int pkey_rsa_verify(EVP_PKEY_CTX *ctx,
                              const unsigned char *sig, size_t siglen,
                              const unsigned char *tbs, size_t tbslen)
      {
      RSA_PKEY_CTX *rctx = ctx->data;
      RSA *rsa = ctx->pkey->pkey.rsa;
      size_t rslen;
      if (rctx->md)
            {
            if (rctx->pad_mode == RSA_PKCS1_PADDING)
                  return RSA_verify(EVP_MD_type(rctx->md), tbs, tbslen,
                              sig, siglen, rsa);
            if (rctx->pad_mode == RSA_X931_PADDING)
                  {
                  if (pkey_rsa_verifyrecover(ctx, NULL, &rslen,
                              sig, siglen) <= 0)
                        return 0;
                  }
            else if (rctx->pad_mode == RSA_PKCS1_PSS_PADDING)
                  {
                  int ret;
                  if (!setup_tbuf(rctx, ctx))
                        return -1;
                  ret = RSA_public_decrypt(siglen, sig, rctx->tbuf,
                                          rsa, RSA_NO_PADDING);
                  if (ret <= 0)
                        return 0;
                  ret = RSA_verify_PKCS1_PSS(rsa, tbs, rctx->md,
                                    rctx->tbuf, rctx->saltlen);
                  if (ret <= 0)
                        return 0;
                  return 1;
                  }
            else
                  return -1;
            }
      else
            {
            if (!setup_tbuf(rctx, ctx))
                  return -1;
            rslen = RSA_public_decrypt(siglen, sig, rctx->tbuf,
                                    rsa, rctx->pad_mode);
            if (rslen == 0)
                  return 0;
            }

      if ((rslen != tbslen) || memcmp(tbs, rctx->tbuf, rslen))
            return 0;

      return 1;
                  
      }
      

static int pkey_rsa_encrypt(EVP_PKEY_CTX *ctx,
                              unsigned char *out, size_t *outlen,
                              const unsigned char *in, size_t inlen)
      {
      int ret;
      RSA_PKEY_CTX *rctx = ctx->data;
      ret = RSA_public_encrypt(inlen, in, out, ctx->pkey->pkey.rsa,
                                          rctx->pad_mode);
      if (ret < 0)
            return ret;
      *outlen = ret;
      return 1;
      }

static int pkey_rsa_decrypt(EVP_PKEY_CTX *ctx,
                              unsigned char *out, size_t *outlen,
                              const unsigned char *in, size_t inlen)
      {
      int ret;
      RSA_PKEY_CTX *rctx = ctx->data;
      ret = RSA_private_decrypt(inlen, in, out, ctx->pkey->pkey.rsa,
                                          rctx->pad_mode);
      if (ret < 0)
            return ret;
      *outlen = ret;
      return 1;
      }

static int check_padding_md(const EVP_MD *md, int padding)
      {
      if (!md)
            return 1;

      if (padding == RSA_NO_PADDING)
            {
            RSAerr(RSA_F_CHECK_PADDING_MD, RSA_R_INVALID_PADDING_MODE);
            return 0;
            }

      if (padding == RSA_X931_PADDING)
            {
            if (RSA_X931_hash_id(EVP_MD_type(md)) == -1)
                  {
                  RSAerr(RSA_F_CHECK_PADDING_MD,
                                    RSA_R_INVALID_X931_DIGEST);
                  return 0;
                  }
            return 1;
            }

      return 1;
      }
                  

static int pkey_rsa_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
      {
      RSA_PKEY_CTX *rctx = ctx->data;
      switch (type)
            {
            case EVP_PKEY_CTRL_RSA_PADDING:
            if ((p1 >= RSA_PKCS1_PADDING) && (p1 <= RSA_PKCS1_PSS_PADDING))
                  {
                  if (!check_padding_md(rctx->md, p1))
                        return 0;
                  if (p1 == RSA_PKCS1_PSS_PADDING) 
                        {
                        if (!(ctx->operation &
                             (EVP_PKEY_OP_SIGN | EVP_PKEY_OP_VERIFY)))
                              goto bad_pad;
                        if (!rctx->md)
                              rctx->md = EVP_sha1();
                        }
                  if (p1 == RSA_PKCS1_OAEP_PADDING) 
                        {
                        if (!(ctx->operation & EVP_PKEY_OP_TYPE_CRYPT))
                              goto bad_pad;
                        if (!rctx->md)
                              rctx->md = EVP_sha1();
                        }
                  rctx->pad_mode = p1;
                  return 1;
                  }
            bad_pad:
            RSAerr(RSA_F_PKEY_RSA_CTRL,
                        RSA_R_ILLEGAL_OR_UNSUPPORTED_PADDING_MODE);
            return -2;

            case EVP_PKEY_CTRL_RSA_PSS_SALTLEN:
            if (p1 < -2)
                  return -2;
            if (rctx->pad_mode != RSA_PKCS1_PSS_PADDING)
                  {
                  RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_PSS_SALTLEN);
                  return -2;
                  }
            rctx->saltlen = p1;
            return 1;

            case EVP_PKEY_CTRL_RSA_KEYGEN_BITS:
            if (p1 < 256)
                  {
                  RSAerr(RSA_F_PKEY_RSA_CTRL, RSA_R_INVALID_KEYBITS);
                  return -2;
                  }
            rctx->nbits = p1;
            return 1;

            case EVP_PKEY_CTRL_RSA_KEYGEN_PUBEXP:
            if (!p2)
                  return -2;
            rctx->pub_exp = p2;
            return 1;

            case EVP_PKEY_CTRL_MD:
            if (!check_padding_md(p2, rctx->pad_mode))
                  return 0;
            rctx->md = p2;
            return 1;

            case EVP_PKEY_CTRL_DIGESTINIT:
            case EVP_PKEY_CTRL_PKCS7_ENCRYPT:
            case EVP_PKEY_CTRL_PKCS7_DECRYPT:
            case EVP_PKEY_CTRL_PKCS7_SIGN:
#ifndef OPENSSL_NO_CMS
            case EVP_PKEY_CTRL_CMS_ENCRYPT:
            case EVP_PKEY_CTRL_CMS_DECRYPT:
            case EVP_PKEY_CTRL_CMS_SIGN:
#endif
            return 1;
            case EVP_PKEY_CTRL_PEER_KEY:
                  RSAerr(RSA_F_PKEY_RSA_CTRL,
                  RSA_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE);
                  return -2;  

            default:
            return -2;

            }
      }
                  
static int pkey_rsa_ctrl_str(EVP_PKEY_CTX *ctx,
                  const char *type, const char *value)
      {
      if (!value)
            {
            RSAerr(RSA_F_PKEY_RSA_CTRL_STR, RSA_R_VALUE_MISSING);
            return 0;
            }
      if (!strcmp(type, "rsa_padding_mode"))
            {
            int pm;
            if (!strcmp(value, "pkcs1"))
                  pm = RSA_PKCS1_PADDING;
            else if (!strcmp(value, "sslv23"))
                  pm = RSA_SSLV23_PADDING;
            else if (!strcmp(value, "none"))
                  pm = RSA_NO_PADDING;
            else if (!strcmp(value, "oeap"))
                  pm = RSA_PKCS1_OAEP_PADDING;
            else if (!strcmp(value, "x931"))
                  pm = RSA_X931_PADDING;
            else if (!strcmp(value, "pss"))
                  pm = RSA_PKCS1_PSS_PADDING;
            else
                  {
                  RSAerr(RSA_F_PKEY_RSA_CTRL_STR,
                                    RSA_R_UNKNOWN_PADDING_TYPE);
                  return -2;
                  }
            return EVP_PKEY_CTX_set_rsa_padding(ctx, pm);
            }

      if (!strcmp(type, "rsa_pss_saltlen"))
            {
            int saltlen;
            saltlen = atoi(value);
            return EVP_PKEY_CTX_set_rsa_pss_saltlen(ctx, saltlen);
            }

      if (!strcmp(type, "rsa_keygen_bits"))
            {
            int nbits;
            nbits = atoi(value);
            return EVP_PKEY_CTX_set_rsa_keygen_bits(ctx, nbits);
            }

      if (!strcmp(type, "rsa_keygen_pubexp"))
            {
            int ret;
            BIGNUM *pubexp = NULL;
            if (!BN_asc2bn(&pubexp, value))
                  return 0;
            ret = EVP_PKEY_CTX_set_rsa_keygen_pubexp(ctx, pubexp);
            if (ret <= 0)
                  BN_free(pubexp);
            return ret;
            }

      return -2;
      }

static int pkey_rsa_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
      {
      RSA *rsa = NULL;
      RSA_PKEY_CTX *rctx = ctx->data;
      BN_GENCB *pcb, cb;
      int ret;
      if (!rctx->pub_exp)
            {
            rctx->pub_exp = BN_new();
            if (!rctx->pub_exp || !BN_set_word(rctx->pub_exp, RSA_F4))
                  return 0;
            }
      rsa = RSA_new();
      if (!rsa)
            return 0;
      if (ctx->pkey_gencb)
            {
            pcb = &cb;
            evp_pkey_set_cb_translate(pcb, ctx);
            }
      else
            pcb = NULL;
      ret = RSA_generate_key_ex(rsa, rctx->nbits, rctx->pub_exp, pcb);
      if (ret > 0)
            EVP_PKEY_assign_RSA(pkey, rsa);
      else
            RSA_free(rsa);
      return ret;
      }

const EVP_PKEY_METHOD rsa_pkey_meth = 
      {
      EVP_PKEY_RSA,
      EVP_PKEY_FLAG_AUTOARGLEN,
      pkey_rsa_init,
      pkey_rsa_copy,
      pkey_rsa_cleanup,

      0,0,

      0,
      pkey_rsa_keygen,

      0,
      pkey_rsa_sign,

      0,
      pkey_rsa_verify,

      0,
      pkey_rsa_verifyrecover,


      0,0,0,0,

      0,
      pkey_rsa_encrypt,

      0,
      pkey_rsa_decrypt,

      0,0,

      pkey_rsa_ctrl,
      pkey_rsa_ctrl_str


      };

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