text: /*
   * Key Derivation that doesn't use PKCS11
   *
   * This Source Code Form is subject to the terms of the Mozilla Public
   * License, v. 2.0. If a copy of the MPL was not distributed with this
   * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
  
  #include "ssl.h" 	/* prereq to sslimpl.h */
  #include "certt.h"	/* prereq to sslimpl.h */
  #include "keythi.h"	/* prereq to sslimpl.h */
  #include "sslimpl.h"
  #ifndef NO_PKCS11_BYPASS
  #include "blapi.h"
  #endif
  
  #include "keyhi.h"
  #include "pk11func.h"
  #include "secasn1.h"
  #include "cert.h"
  #include "secmodt.h"
  
  #include "sslproto.h"
  #include "sslerr.h"
  
  #ifndef NO_PKCS11_BYPASS
  /* make this a macro! */
  #ifdef NOT_A_MACRO
  static void
  buildSSLKey(unsigned char * keyBlock, unsigned int keyLen, SECItem * result,
              const char * label)
  {
      result->type = siBuffer;
      result->data = keyBlock;
      result->len  = keyLen;
      PRINT_BUF(100, (NULL, label, keyBlock, keyLen));
  }
  #else
  #define buildSSLKey(keyBlock, keyLen, result, label) \
  { \
      (result)->type = siBuffer; \
      (result)->data = keyBlock; \
      (result)->len  = keyLen; \
      PRINT_BUF(100, (NULL, label, keyBlock, keyLen)); \
  }
  #endif
  
  /*
   * SSL Key generation given pre master secret
   */
  #ifndef NUM_MIXERS
  #define NUM_MIXERS 9
  #endif
  static const char * const mixers[NUM_MIXERS] = { 
      "A", 
      "BB", 
      "CCC", 
      "DDDD", 
      "EEEEE", 
      "FFFFFF", 
      "GGGGGGG",
      "HHHHHHHH",
      "IIIIIIIII" 
  };
  
  
  SECStatus
  ssl3_KeyAndMacDeriveBypass(
      ssl3CipherSpec *      pwSpec,
      const unsigned char * cr,
      const unsigned char * sr,
      PRBool                isTLS,
      PRBool                isExport)
  {
      const ssl3BulkCipherDef *cipher_def = pwSpec->cipher_def;
      unsigned char * key_block    = pwSpec->key_block;
      unsigned char * key_block2   = NULL;
      unsigned int    block_bytes  = 0;
      unsigned int    block_needed = 0;
      unsigned int    i;
      unsigned int    keySize;            /* actual    size of cipher keys */
      unsigned int    effKeySize;		/* effective size of cipher keys */
      unsigned int    macSize;		/* size of MAC secret */
      unsigned int    IVSize;		/* size of IV */
      PRBool          explicitIV = PR_FALSE;
      SECStatus       rv    = SECFailure;
      SECStatus       status = SECSuccess;
      PRBool          isFIPS = PR_FALSE;
      PRBool          isTLS12 = pwSpec->version >= SSL_LIBRARY_VERSION_TLS_1_2;
  
      SECItem         srcr;
      SECItem         crsr;
  
      unsigned char     srcrdata[SSL3_RANDOM_LENGTH * 2];
      unsigned char     crsrdata[SSL3_RANDOM_LENGTH * 2];
      PRUint64          md5buf[22];
      PRUint64          shabuf[40];
  
  #define md5Ctx ((MD5Context *)md5buf)
  #define shaCtx ((SHA1Context *)shabuf)
  
      static const SECItem zed  = { siBuffer, NULL, 0 };
  
      if (pwSpec->msItem.data == NULL ||
          pwSpec->msItem.len  != SSL3_MASTER_SECRET_LENGTH) {
  	PORT_SetError(SEC_ERROR_INVALID_ARGS);
  	return rv;
      }
  
      PRINT_BUF(100, (NULL, "Master Secret", pwSpec->msItem.data, 
                                             pwSpec->msItem.len));
  
      /* figure out how much is needed */
      macSize    = pwSpec->mac_size;
      keySize    = cipher_def->key_size;
      effKeySize = cipher_def->secret_key_size;
      IVSize     = cipher_def->iv_size;
      if (keySize == 0) {
  	effKeySize = IVSize = 0; /* only MACing */
      }
      if (cipher_def->type == type_block &&
  	pwSpec->version >= SSL_LIBRARY_VERSION_TLS_1_1) {
  	/* Block ciphers in >= TLS 1.1 use a per-record, explicit IV. */
  	explicitIV = PR_TRUE;
      }
      block_needed =
  	2 * (macSize + effKeySize + ((!isExport && !explicitIV) * IVSize));
  
      /*
       * clear out our returned keys so we can recover on failure
       */
      pwSpec->client.write_key_item     = zed;
      pwSpec->client.write_mac_key_item = zed;
      pwSpec->server.write_key_item     = zed;
      pwSpec->server.write_mac_key_item = zed;
  
      /* initialize the server random, client random block */
      srcr.type   = siBuffer;
      srcr.data   = srcrdata;
      srcr.len    = sizeof srcrdata;
      PORT_Memcpy(srcrdata, sr, SSL3_RANDOM_LENGTH);
      PORT_Memcpy(srcrdata + SSL3_RANDOM_LENGTH, cr, SSL3_RANDOM_LENGTH);
  
      /* initialize the client random, server random block */
      crsr.type   = siBuffer;
      crsr.data   = crsrdata;
      crsr.len    = sizeof crsrdata;
      PORT_Memcpy(crsrdata, cr, SSL3_RANDOM_LENGTH);
      PORT_Memcpy(crsrdata + SSL3_RANDOM_LENGTH, sr, SSL3_RANDOM_LENGTH);
      PRINT_BUF(100, (NULL, "Key & MAC CRSR", crsr.data, crsr.len));
  
      /*
       * generate the key material:
       */
      if (isTLS) {
  	SECItem       keyblk;
  
  	keyblk.type = siBuffer;
  	keyblk.data = key_block;
  	keyblk.len  = block_needed;
  
  	if (isTLS12) {
  	    status = TLS_P_hash(HASH_AlgSHA256, &pwSpec->msItem,
  				"key expansion", &srcr, &keyblk, isFIPS);
  	} else {
  	    status = TLS_PRF(&pwSpec->msItem, "key expansion", &srcr, &keyblk,
  			     isFIPS);
  	}
  	if (status != SECSuccess) {
  	    goto key_and_mac_derive_fail;
  	}
  	block_bytes = keyblk.len;
      } else {
  	/* key_block = 
  	 *     MD5(master_secret + SHA('A' + master_secret + 
  	 *                      ServerHello.random + ClientHello.random)) +
  	 *     MD5(master_secret + SHA('BB' + master_secret + 
  	 *                      ServerHello.random + ClientHello.random)) +
  	 *     MD5(master_secret + SHA('CCC' + master_secret + 
  	 *                      ServerHello.random + ClientHello.random)) +
  	 *     [...];
  	 */
  	unsigned int made = 0;
  	for (i = 0; made < block_needed && i < NUM_MIXERS; ++i) {
  	    unsigned int    outLen;
  	    unsigned char   sha_out[SHA1_LENGTH];
  
  	    SHA1_Begin(shaCtx);
  	    SHA1_Update(shaCtx, (unsigned char*)(mixers[i]), i+1);
  	    SHA1_Update(shaCtx, pwSpec->msItem.data, pwSpec->msItem.len);
  	    SHA1_Update(shaCtx, srcr.data, srcr.len);
  	    SHA1_End(shaCtx, sha_out, &outLen, SHA1_LENGTH);
  	    PORT_Assert(outLen == SHA1_LENGTH);
  
  	    MD5_Begin(md5Ctx);
  	    MD5_Update(md5Ctx, pwSpec->msItem.data, pwSpec->msItem.len);
  	    MD5_Update(md5Ctx, sha_out, outLen);
  	    MD5_End(md5Ctx, key_block + made, &outLen, MD5_LENGTH);
  	    PORT_Assert(outLen == MD5_LENGTH);
  	    made += MD5_LENGTH;
  	}
  	block_bytes = made;
      }
      PORT_Assert(block_bytes >= block_needed);
      PORT_Assert(block_bytes <= sizeof pwSpec->key_block);
      PRINT_BUF(100, (NULL, "key block", key_block, block_bytes));
  
      /*
       * Put the key material where it goes.
       */
      key_block2 = key_block + block_bytes;
      i = 0;			/* now shows how much consumed */
  
      /* 
       * The key_block is partitioned as follows:
       * client_write_MAC_secret[CipherSpec.hash_size]
       */
      buildSSLKey(&key_block[i],macSize, &pwSpec->client.write_mac_key_item, \
                  "Client Write MAC Secret");
      i += macSize;
  
      /* 
       * server_write_MAC_secret[CipherSpec.hash_size]
       */
      buildSSLKey(&key_block[i],macSize, &pwSpec->server.write_mac_key_item, \
                  "Server Write MAC Secret");
      i += macSize;
  
      if (!keySize) {
  	/* only MACing */
  	buildSSLKey(NULL, 0, &pwSpec->client.write_key_item, \
  	            "Client Write Key (MAC only)");
  	buildSSLKey(NULL, 0, &pwSpec->server.write_key_item, \
  	            "Server Write Key (MAC only)");
  	buildSSLKey(NULL, 0, &pwSpec->client.write_iv_item, \
  	            "Client Write IV (MAC only)");
  	buildSSLKey(NULL, 0, &pwSpec->server.write_iv_item, \
  	            "Server Write IV (MAC only)");
      } else if (!isExport) {
  	/* 
  	** Generate Domestic write keys and IVs.
  	** client_write_key[CipherSpec.key_material]
  	*/
  	buildSSLKey(&key_block[i], keySize, &pwSpec->client.write_key_item, \
  	            "Domestic Client Write Key");
  	i += keySize;
  
  	/* 
  	** server_write_key[CipherSpec.key_material]
  	*/
  	buildSSLKey(&key_block[i], keySize, &pwSpec->server.write_key_item, \
  	            "Domestic Server Write Key");
  	i += keySize;
  
  	if (IVSize > 0) {
  	    if (explicitIV) {
  		static unsigned char zero_block[32];
  		PORT_Assert(IVSize <= sizeof zero_block);
  		buildSSLKey(&zero_block[0], IVSize, \
  			    &pwSpec->client.write_iv_item, \
  			    "Domestic Client Write IV");
  		buildSSLKey(&zero_block[0], IVSize, \
  			    &pwSpec->server.write_iv_item, \
  			    "Domestic Server Write IV");
  	    } else {
  		/* 
  		** client_write_IV[CipherSpec.IV_size]
  		*/
  		buildSSLKey(&key_block[i], IVSize, \
  			    &pwSpec->client.write_iv_item, \
  			    "Domestic Client Write IV");
  		i += IVSize;
  
  		/* 
  		** server_write_IV[CipherSpec.IV_size]
  		*/
  		buildSSLKey(&key_block[i], IVSize, \
  			    &pwSpec->server.write_iv_item, \
  			    "Domestic Server Write IV");
  		i += IVSize;
  	    }
  	}
  	PORT_Assert(i <= block_bytes);
      } else if (!isTLS) { 
  	/*
  	** Generate SSL3 Export write keys and IVs.
  	*/
  	unsigned int    outLen;
  
  	/*
  	** client_write_key[CipherSpec.key_material]
  	** final_client_write_key = MD5(client_write_key +
  	**                   ClientHello.random + ServerHello.random);
  	*/
  	MD5_Begin(md5Ctx);
  	MD5_Update(md5Ctx, &key_block[i], effKeySize);
  	MD5_Update(md5Ctx, crsr.data, crsr.len);
  	MD5_End(md5Ctx, key_block2, &outLen, MD5_LENGTH);
  	i += effKeySize;
  	buildSSLKey(key_block2, keySize, &pwSpec->client.write_key_item, \
  	            "SSL3 Export Client Write Key");
  	key_block2 += keySize;
  
  	/*
  	** server_write_key[CipherSpec.key_material]
  	** final_server_write_key = MD5(server_write_key +
  	**                    ServerHello.random + ClientHello.random);
  	*/
  	MD5_Begin(md5Ctx);
  	MD5_Update(md5Ctx, &key_block[i], effKeySize);
  	MD5_Update(md5Ctx, srcr.data, srcr.len);
  	MD5_End(md5Ctx, key_block2, &outLen, MD5_LENGTH);
  	i += effKeySize;
  	buildSSLKey(key_block2, keySize, &pwSpec->server.write_key_item, \
  	            "SSL3 Export Server Write Key");
  	key_block2 += keySize;
  	PORT_Assert(i <= block_bytes);
  
  	if (IVSize) {
  	    /*
  	    ** client_write_IV = 
  	    **	MD5(ClientHello.random + ServerHello.random);
  	    */
  	    MD5_Begin(md5Ctx);
  	    MD5_Update(md5Ctx, crsr.data, crsr.len);
  	    MD5_End(md5Ctx, key_block2, &outLen, MD5_LENGTH);
  	    buildSSLKey(key_block2, IVSize, &pwSpec->client.write_iv_item, \
  	                "SSL3 Export Client Write IV");
  	    key_block2 += IVSize;
  
  	    /*
  	    ** server_write_IV = 
  	    **	MD5(ServerHello.random + ClientHello.random);
  	    */
  	    MD5_Begin(md5Ctx);
  	    MD5_Update(md5Ctx, srcr.data, srcr.len);
  	    MD5_End(md5Ctx, key_block2, &outLen, MD5_LENGTH);
  	    buildSSLKey(key_block2, IVSize, &pwSpec->server.write_iv_item, \
  	                "SSL3 Export Server Write IV");
  	    key_block2 += IVSize;
  	}
  
  	PORT_Assert(key_block2 - key_block <= sizeof pwSpec->key_block);
      } else {
  	/*
  	** Generate TLS Export write keys and IVs.
  	*/
  	SECItem       secret ;
  	SECItem       keyblk ;
  
  	secret.type = siBuffer;
  	keyblk.type = siBuffer;
  	/*
  	** client_write_key[CipherSpec.key_material]
  	** final_client_write_key = PRF(client_write_key, 
  	**                              "client write key",
  	**                              client_random + server_random);
  	*/
  	secret.data = &key_block[i];
  	secret.len  = effKeySize;
  	i          += effKeySize;
  	keyblk.data = key_block2;
  	keyblk.len  = keySize;
  	status = TLS_PRF(&secret, "client write key", &crsr, &keyblk, isFIPS);
  	if (status != SECSuccess) {
  	    goto key_and_mac_derive_fail;
  	}
  	buildSSLKey(key_block2, keySize, &pwSpec->client.write_key_item, \
  	            "TLS Export Client Write Key");
  	key_block2 += keySize;
  
  	/*
  	** server_write_key[CipherSpec.key_material]
  	** final_server_write_key = PRF(server_write_key,
  	**                              "server write key",
  	**                              client_random + server_random);
  	*/
  	secret.data = &key_block[i];
  	secret.len  = effKeySize;
  	i          += effKeySize;
  	keyblk.data = key_block2;
  	keyblk.len  = keySize;
  	status = TLS_PRF(&secret, "server write key", &crsr, &keyblk, isFIPS);
  	if (status != SECSuccess) {
  	    goto key_and_mac_derive_fail;
  	}
  	buildSSLKey(key_block2, keySize, &pwSpec->server.write_key_item, \
  	            "TLS Export Server Write Key");
  	key_block2 += keySize;
  
  	/*
  	** iv_block = PRF("", "IV block", client_random + server_random);
  	** client_write_IV[SecurityParameters.IV_size]
  	** server_write_IV[SecurityParameters.IV_size]
  	*/
  	if (IVSize) {
  	    secret.data = NULL;
  	    secret.len  = 0;
  	    keyblk.data = key_block2;
  	    keyblk.len  = 2 * IVSize;
  	    status = TLS_PRF(&secret, "IV block", &crsr, &keyblk, isFIPS);
  	    if (status != SECSuccess) {
  		goto key_and_mac_derive_fail;
  	    }
  	    buildSSLKey(key_block2,          IVSize, \
  	                &pwSpec->client.write_iv_item, \
  			"TLS Export Client Write IV");
  	    buildSSLKey(key_block2 + IVSize, IVSize, \
  	                &pwSpec->server.write_iv_item, \
  			"TLS Export Server Write IV");
  	    key_block2 += 2 * IVSize;
  	}
  	PORT_Assert(key_block2 - key_block <= sizeof pwSpec->key_block);
      }
      rv = SECSuccess;
  
  key_and_mac_derive_fail:
  
      MD5_DestroyContext(md5Ctx, PR_FALSE);
      SHA1_DestroyContext(shaCtx, PR_FALSE);
  
      if (rv != SECSuccess) {
  	PORT_SetError(SSL_ERROR_SESSION_KEY_GEN_FAILURE);
      }
  
      return rv;
  }
  
  
  /* derive the Master Secret from the PMS */
  /* Presently, this is only done wtih RSA PMS, and only on the server side,
   * so isRSA is always true. 
   */
  SECStatus
  ssl3_MasterKeyDeriveBypass( 
      ssl3CipherSpec *      pwSpec,
      const unsigned char * cr,
      const unsigned char * sr,
      const SECItem *       pms,
      PRBool                isTLS,
      PRBool                isRSA)
  {
      unsigned char * key_block    = pwSpec->key_block;
      SECStatus       rv    = SECSuccess;
      PRBool          isFIPS = PR_FALSE;
      PRBool          isTLS12 = pwSpec->version >= SSL_LIBRARY_VERSION_TLS_1_2;
  
      SECItem         crsr;
  
      unsigned char     crsrdata[SSL3_RANDOM_LENGTH * 2];
      PRUint64          md5buf[22];
      PRUint64          shabuf[40];
  
  #define md5Ctx ((MD5Context *)md5buf)
  #define shaCtx ((SHA1Context *)shabuf)
  
      /* first do the consistancy checks */
      if (isRSA) { 
  	PORT_Assert(pms->len == SSL3_RSA_PMS_LENGTH);
  	if (pms->len != SSL3_RSA_PMS_LENGTH) {
  	    PORT_SetError(SEC_ERROR_INVALID_ARGS);
  	    return SECFailure;
  	}
  	/* caller must test PMS version for rollback */
      }
  
      /* initialize the client random, server random block */
      crsr.type   = siBuffer;
      crsr.data   = crsrdata;
      crsr.len    = sizeof crsrdata;
      PORT_Memcpy(crsrdata, cr, SSL3_RANDOM_LENGTH);
      PORT_Memcpy(crsrdata + SSL3_RANDOM_LENGTH, sr, SSL3_RANDOM_LENGTH);
      PRINT_BUF(100, (NULL, "Master Secret CRSR", crsr.data, crsr.len));
  
      /* finally do the key gen */
      if (isTLS) {
  	SECItem master = { siBuffer, NULL, 0 };
  
  	master.data = key_block;
  	master.len = SSL3_MASTER_SECRET_LENGTH;
  
  	if (isTLS12) {
  	    rv = TLS_P_hash(HASH_AlgSHA256, pms, "master secret", &crsr,
  			    &master, isFIPS);
  	} else {
  	    rv = TLS_PRF(pms, "master secret", &crsr, &master, isFIPS);
  	}
  	if (rv != SECSuccess) {
  	    PORT_SetError(SSL_ERROR_SESSION_KEY_GEN_FAILURE);
  	}
      } else {
  	int i;
  	unsigned int made = 0;
  	for (i = 0; i < 3; i++) {
  	    unsigned int    outLen;
  	    unsigned char   sha_out[SHA1_LENGTH];
  
  	    SHA1_Begin(shaCtx);
  	    SHA1_Update(shaCtx, (unsigned char*) mixers[i], i+1);
  	    SHA1_Update(shaCtx, pms->data, pms->len);
  	    SHA1_Update(shaCtx, crsr.data, crsr.len);
  	    SHA1_End(shaCtx, sha_out, &outLen, SHA1_LENGTH);
  	    PORT_Assert(outLen == SHA1_LENGTH);
  
  	    MD5_Begin(md5Ctx);
  	    MD5_Update(md5Ctx, pms->data, pms->len);
  	    MD5_Update(md5Ctx, sha_out, outLen);
  	    MD5_End(md5Ctx, key_block + made, &outLen, MD5_LENGTH);
  	    PORT_Assert(outLen == MD5_LENGTH);
  	    made += outLen;
  	}
      }
  
      /* store the results */
      PORT_Memcpy(pwSpec->raw_master_secret, key_block, 
  		SSL3_MASTER_SECRET_LENGTH);
      pwSpec->msItem.data = pwSpec->raw_master_secret;
      pwSpec->msItem.len  = SSL3_MASTER_SECRET_LENGTH;
      PRINT_BUF(100, (NULL, "Master Secret", pwSpec->msItem.data, 
                                             pwSpec->msItem.len));
  
      return rv;
  }
  
  static SECStatus
  ssl_canExtractMS(PK11SymKey *pms, PRBool isTLS, PRBool isDH, PRBool *pcbp)
  {   SECStatus	      rv;
      PK11SymKey *    ms = NULL;
      SECItem         params = {siBuffer, NULL, 0};
      CK_SSL3_MASTER_KEY_DERIVE_PARAMS master_params;
      unsigned char   rand[SSL3_RANDOM_LENGTH];
      CK_VERSION      pms_version;
      CK_MECHANISM_TYPE master_derive;
      CK_MECHANISM_TYPE key_derive;
      CK_FLAGS          keyFlags;
      
      if (pms == NULL)
  	return(SECFailure);
  
      PORT_Memset(rand, 0, SSL3_RANDOM_LENGTH);
  
      if (isTLS) {
  	if(isDH) master_derive = CKM_TLS_MASTER_KEY_DERIVE_DH;
  	else master_derive = CKM_TLS_MASTER_KEY_DERIVE;
  	key_derive    = CKM_TLS_KEY_AND_MAC_DERIVE;
  	keyFlags      = CKF_SIGN | CKF_VERIFY;
      } else {
  	if (isDH) master_derive = CKM_SSL3_MASTER_KEY_DERIVE_DH;
  	else master_derive = CKM_SSL3_MASTER_KEY_DERIVE;
  	key_derive    = CKM_SSL3_KEY_AND_MAC_DERIVE;
  	keyFlags      = 0;
      }
  
      master_params.pVersion                     = &pms_version;
      master_params.RandomInfo.pClientRandom     = rand;
      master_params.RandomInfo.ulClientRandomLen = SSL3_RANDOM_LENGTH;
      master_params.RandomInfo.pServerRandom     = rand;
      master_params.RandomInfo.ulServerRandomLen = SSL3_RANDOM_LENGTH;
  
      params.data = (unsigned char *) &master_params;
      params.len  = sizeof master_params;
  
      ms = PK11_DeriveWithFlags(pms, master_derive, &params, key_derive,
  			      CKA_DERIVE, 0, keyFlags);
      if (ms == NULL)
  	return(SECFailure);
  
      rv = PK11_ExtractKeyValue(ms);
      *pcbp = (rv == SECSuccess);
      PK11_FreeSymKey(ms);
      
      return(rv);
  
  }
  #endif  /* !NO_PKCS11_BYPASS */
  
  /* Check the key exchange algorithm for each cipher in the list to see if
   * a master secret key can be extracted. If the KEA will use keys from the 
   * specified cert make sure the extract operation is attempted from the slot
   * where the private key resides.
   * If MS can be extracted for all ciphers, (*pcanbypass) is set to TRUE and
   * SECSuccess is returned. In all other cases but one (*pcanbypass) is
   * set to FALSE and SECFailure is returned.
   * In that last case Derive() has been called successfully but the MS is null, 
   * CanBypass sets (*pcanbypass) to FALSE and returns SECSuccess indicating the
   * arguments were all valid but the slot cannot be bypassed.
   */
  
  /* XXX Add SSL_CBP_TLS1_1 and test it in protocolmask when setting isTLS. */
  
  SECStatus 
  SSL_CanBypass(CERTCertificate *cert, SECKEYPrivateKey *srvPrivkey,
  	      PRUint32 protocolmask, PRUint16 *ciphersuites, int nsuites,
                PRBool *pcanbypass, void *pwArg)
  {
  #ifdef NO_PKCS11_BYPASS
      if (!pcanbypass) {
          PORT_SetError(SEC_ERROR_INVALID_ARGS);
          return SECFailure;
      }
      *pcanbypass = PR_FALSE;
      return SECSuccess;
  #else
      SECStatus	      rv;
      int		      i;
      PRUint16	      suite;
      PK11SymKey *      pms = NULL;
      SECKEYPublicKey * srvPubkey = NULL;
      KeyType	      privKeytype;
      PK11SlotInfo *    slot = NULL;
      SECItem           param;
      CK_VERSION 	      version;
      CK_MECHANISM_TYPE mechanism_array[2];
      SECItem           enc_pms = {siBuffer, NULL, 0};
      PRBool	      isTLS = PR_FALSE;
      SSLCipherSuiteInfo csdef;
      PRBool	      testrsa = PR_FALSE;
      PRBool	      testrsa_export = PR_FALSE;
      PRBool	      testecdh = PR_FALSE;
      PRBool	      testecdhe = PR_FALSE;
  #ifndef NSS_DISABLE_ECC
      SECKEYECParams ecParams = { siBuffer, NULL, 0 };
  #endif
  
      if (!cert || !srvPrivkey || !ciphersuites || !pcanbypass) {
  	PORT_SetError(SEC_ERROR_INVALID_ARGS);
          return SECFailure;
      }
      
      srvPubkey = CERT_ExtractPublicKey(cert);
      if (!srvPubkey)
          return SECFailure;
  	
      *pcanbypass = PR_TRUE;
      rv = SECFailure;
      
      /* determine which KEAs to test */
      /* 0 (TLS_NULL_WITH_NULL_NULL) is used as a list terminator because
       * SSL3 and TLS specs forbid negotiating that cipher suite number.
       */
      for (i=0; i < nsuites && (suite = *ciphersuites++) != 0; i++) {
  	/* skip SSL2 cipher suites and ones NSS doesn't support */
  	if (SSL_GetCipherSuiteInfo(suite, &csdef, sizeof(csdef)) != SECSuccess
  	    || SSL_IS_SSL2_CIPHER(suite) )
  	    continue;
  	switch (csdef.keaType) {
  	case ssl_kea_rsa:
  	    switch (csdef.cipherSuite) {
  	    case TLS_RSA_EXPORT1024_WITH_RC4_56_SHA:
  	    case TLS_RSA_EXPORT1024_WITH_DES_CBC_SHA:
  	    case TLS_RSA_EXPORT_WITH_RC4_40_MD5:
  	    case TLS_RSA_EXPORT_WITH_RC2_CBC_40_MD5:
  		testrsa_export = PR_TRUE;
  	    }
  	    if (!testrsa_export)
  		testrsa = PR_TRUE;
  	    break;
  	case ssl_kea_ecdh:
  	    if (strcmp(csdef.keaTypeName, "ECDHE") == 0) /* ephemeral? */
  		testecdhe = PR_TRUE;
  	    else
  		testecdh = PR_TRUE;
  	    break;
  	case ssl_kea_dh:
  	    /* this is actually DHE */
  	default:
  	    continue;
  	}
      }
      
      /* For each protocol try to derive and extract an MS.
       * Failure of function any function except MS extract means
       * continue with the next cipher test. Stop testing when the list is
       * exhausted or when the first MS extract--not derive--fails.
       */
      privKeytype = SECKEY_GetPrivateKeyType(srvPrivkey);
      protocolmask &= SSL_CBP_SSL3|SSL_CBP_TLS1_0;
      while (protocolmask) {
  	if (protocolmask & SSL_CBP_SSL3) {
  	    isTLS = PR_FALSE;
  	    protocolmask ^= SSL_CBP_SSL3;
  	} else {
  	    isTLS = PR_TRUE;
  	    protocolmask ^= SSL_CBP_TLS1_0;
  	}
  
  	if (privKeytype == rsaKey && testrsa_export) {
  	    if (PK11_GetPrivateModulusLen(srvPrivkey) > EXPORT_RSA_KEY_LENGTH) {
  		*pcanbypass = PR_FALSE;
  		rv = SECSuccess;
  		break;
  	    } else
  		testrsa = PR_TRUE;
  	}
  	for (; privKeytype == rsaKey && testrsa; ) {
  	    /* TLS_RSA */
  	    unsigned char     rsaPmsBuf[SSL3_RSA_PMS_LENGTH];
  	    unsigned int      outLen = 0;
  	    CK_MECHANISM_TYPE target;
  	    SECStatus	      irv;
  	    
  	    mechanism_array[0] = CKM_SSL3_PRE_MASTER_KEY_GEN;
  	    mechanism_array[1] = CKM_RSA_PKCS;
  
  	    slot = PK11_GetBestSlotMultiple(mechanism_array, 2, pwArg);
  	    if (slot == NULL) {
  		PORT_SetError(SSL_ERROR_TOKEN_SLOT_NOT_FOUND);
  		break;
  	    }
  
  	    /* Generate the pre-master secret ...  (client side) */
  	    version.major = 3 /*MSB(clientHelloVersion)*/;
  	    version.minor = 0 /*LSB(clientHelloVersion)*/;
  	    param.data = (unsigned char *)&version;
  	    param.len  = sizeof version;
  	    pms = PK11_KeyGen(slot, CKM_SSL3_PRE_MASTER_KEY_GEN, &param, 0, pwArg);
  	    PK11_FreeSlot(slot);
  	    if (!pms)
  		break;
  	    /* now wrap it */
  	    enc_pms.len  = SECKEY_PublicKeyStrength(srvPubkey);
  	    enc_pms.data = (unsigned char*)PORT_Alloc(enc_pms.len);
  	    if (enc_pms.data == NULL) {
  	        PORT_SetError(PR_OUT_OF_MEMORY_ERROR);
  	        break;
  	    }
  	    irv = PK11_PubWrapSymKey(CKM_RSA_PKCS, srvPubkey, pms, &enc_pms);
  	    if (irv != SECSuccess) 
  		break;
  	    PK11_FreeSymKey(pms);
  	    pms = NULL;
  	    /* now do the server side--check the triple bypass first */
  	    rv = PK11_PrivDecryptPKCS1(srvPrivkey, rsaPmsBuf, &outLen,
  				       sizeof rsaPmsBuf,
  				       (unsigned char *)enc_pms.data,
  				       enc_pms.len);
  	    /* if decrypt worked we're done with the RSA test */
  	    if (rv == SECSuccess) {
  		*pcanbypass = PR_TRUE;
  		break;
  	    }
  	    /* check for fallback to double bypass */
  	    target = isTLS ? CKM_TLS_MASTER_KEY_DERIVE
  			: CKM_SSL3_MASTER_KEY_DERIVE;
  	    pms = PK11_PubUnwrapSymKey(srvPrivkey, &enc_pms,
  				       target, CKA_DERIVE, 0);
  	    rv = ssl_canExtractMS(pms, isTLS, PR_FALSE, pcanbypass);
  	    if (rv == SECSuccess && *pcanbypass == PR_FALSE)
  		goto done;
  	    break;
  	}
  
  	/* Check for NULL to avoid double free. 
  	 * SECItem_FreeItem sets data NULL in secitem.c#265 
  	 */
  	if (enc_pms.data != NULL) {
  	    SECITEM_FreeItem(&enc_pms, PR_FALSE);
          }
  #ifndef NSS_DISABLE_ECC
  	for (; (privKeytype == ecKey && ( testecdh || testecdhe)) ||
  	       (privKeytype == rsaKey && testecdhe); ) {
  	    CK_MECHANISM_TYPE target;
  	    SECKEYPublicKey  *keapub = NULL;
  	    SECKEYPrivateKey *keapriv;
  	    SECKEYPublicKey  *cpub = NULL; /* client's ephemeral ECDH keys */
  	    SECKEYPrivateKey *cpriv = NULL;
  	    SECKEYECParams   *pecParams = NULL;
  
  	    if (privKeytype == ecKey && testecdhe) {
  		/* TLS_ECDHE_ECDSA */
  		pecParams = &srvPubkey->u.ec.DEREncodedParams;
  	    } else if (privKeytype == rsaKey && testecdhe) {
  		/* TLS_ECDHE_RSA */
  		ECName       ec_curve;
  		int		 serverKeyStrengthInBits;
  		int		 signatureKeyStrength;
  		int		 requiredECCbits;
  
  		/* find a curve of equivalent strength to the RSA key's */
  		requiredECCbits = PK11_GetPrivateModulusLen(srvPrivkey);
  		if (requiredECCbits < 0)
  		    break;
  		requiredECCbits *= BPB;
  		serverKeyStrengthInBits = srvPubkey->u.rsa.modulus.len;
  		if (srvPubkey->u.rsa.modulus.data[0] == 0) {
  		    serverKeyStrengthInBits--;
  		}
  		/* convert to strength in bits */
  		serverKeyStrengthInBits *= BPB;
  
  		signatureKeyStrength =
  		    SSL_RSASTRENGTH_TO_ECSTRENGTH(serverKeyStrengthInBits);
  
  		if ( requiredECCbits > signatureKeyStrength ) 
  		     requiredECCbits = signatureKeyStrength;
  
  		ec_curve =
  		    ssl3_GetCurveWithECKeyStrength(
  					ssl3_GetSupportedECCurveMask(NULL),
  				  	requiredECCbits);
  		rv = ssl3_ECName2Params(NULL, ec_curve, &ecParams);
  		if (rv == SECFailure) {
  		    break;
  		}
  		pecParams = &ecParams;
  	    }
  
  	    if (testecdhe) {
  		/* generate server's ephemeral keys */
  		keapriv = SECKEY_CreateECPrivateKey(pecParams, &keapub, NULL); 
  		if (!keapriv || !keapub) {
  		    if (keapriv)
  			SECKEY_DestroyPrivateKey(keapriv);
  		    if (keapub)
  			SECKEY_DestroyPublicKey(keapub);
  		    PORT_SetError(SEC_ERROR_KEYGEN_FAIL);
  		    rv = SECFailure;
  		    break;
  		}
  	    } else {
  		/* TLS_ECDH_ECDSA */
  		keapub = srvPubkey;
  		keapriv = srvPrivkey;
  		pecParams = &srvPubkey->u.ec.DEREncodedParams;
  	    }
  
  	    /* perform client side ops */
  	    /* generate a pair of ephemeral keys using server's parms */
  	    cpriv = SECKEY_CreateECPrivateKey(pecParams, &cpub, NULL);
  	    if (!cpriv || !cpub) {
  		if (testecdhe) {
  		    SECKEY_DestroyPrivateKey(keapriv);
  		    SECKEY_DestroyPublicKey(keapub);
  		}
  		PORT_SetError(SEC_ERROR_KEYGEN_FAIL);
  		rv = SECFailure;
  		break;
  	    }
  	    /* now do the server side */
  	    /* determine the PMS using client's public value */
  	    target = isTLS ? CKM_TLS_MASTER_KEY_DERIVE_DH
  			   : CKM_SSL3_MASTER_KEY_DERIVE_DH;
  	    pms = PK11_PubDeriveWithKDF(keapriv, cpub, PR_FALSE, NULL, NULL,
  				    CKM_ECDH1_DERIVE,
  				    target,
  				    CKA_DERIVE, 0, CKD_NULL, NULL, NULL);
  	    rv = ssl_canExtractMS(pms, isTLS, PR_TRUE, pcanbypass);
  	    SECKEY_DestroyPrivateKey(cpriv);
  	    SECKEY_DestroyPublicKey(cpub);
  	    if (testecdhe) {
  		SECKEY_DestroyPrivateKey(keapriv);
  		SECKEY_DestroyPublicKey(keapub);
  	    }
  	    if (rv == SECSuccess && *pcanbypass == PR_FALSE)
  		goto done;
  	    break;
  	}
  	/* Check for NULL to avoid double free. */
  	if (ecParams.data != NULL) {
  	    PORT_Free(ecParams.data);
  	    ecParams.data = NULL;
  	}
  #endif /* NSS_DISABLE_ECC */
  	if (pms)
  	    PK11_FreeSymKey(pms);
      }
  
      /* *pcanbypass has been set */
      rv = SECSuccess;
      
    done:
      if (pms)
  	PK11_FreeSymKey(pms);
  
      /* Check for NULL to avoid double free. 
       * SECItem_FreeItem sets data NULL in secitem.c#265 
       */
      if (enc_pms.data != NULL) {
      	SECITEM_FreeItem(&enc_pms, PR_FALSE);
      }
  #ifndef NSS_DISABLE_ECC
      if (ecParams.data != NULL) {
          PORT_Free(ecParams.data);
          ecParams.data = NULL;
      }
  #endif /* NSS_DISABLE_ECC */
  
      if (srvPubkey) {
      	SECKEY_DestroyPublicKey(srvPubkey);
  	srvPubkey = NULL;
      }
  
  
      return rv;
  #endif /* NO_PKCS11_BYPASS */
  }
  
  