The Tor Browser: security/nss/lib/ssl/ssl3ecc.c@b8a032363ba2 (annotated)

security/nss/lib/ssl/ssl3ecc.c@b8a032363ba2 (annotated)

security/nss/lib/ssl/ssl3ecc.c

Thu, 22 Jan 2015 13:21:57 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Thu, 22 Jan 2015 13:21:57 +0100
branch: TOR_BUG_9701
changeset 15: b8a032363ba2
permissions: -rw-r--r--

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

 /*
  * SSL3 Protocol
  *
  * 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/. */
 /* ECC code moved here from ssl3con.c */
 #include "nss.h"
 #include "cert.h"
 #include "ssl.h"
 #include "cryptohi.h"   /* for DSAU_ stuff */
 #include "keyhi.h"
 #include "secder.h"
 #include "secitem.h"
 #include "sslimpl.h"
 #include "sslproto.h"
 #include "sslerr.h"
 #include "prtime.h"
 #include "prinrval.h"
 #include "prerror.h"
 #include "pratom.h"
 #include "prthread.h"
 #include "prinit.h"
 #include "pk11func.h"
 #include "secmod.h"
 #include <stdio.h>
 #ifndef NSS_DISABLE_ECC
 #ifndef PK11_SETATTRS
 #define PK11_SETATTRS(x,id,v,l) (x)->type = (id); \
                 (x)->pValue=(v); (x)->ulValueLen = (l);
 #endif
 #define SSL_GET_SERVER_PUBLIC_KEY(sock, type) \
     (ss->serverCerts[type].serverKeyPair ? \
     ss->serverCerts[type].serverKeyPair->pubKey : NULL)
 #define SSL_IS_CURVE_NEGOTIATED(curvemsk, curveName) \
     ((curveName > ec_noName) && \
      (curveName < ec_pastLastName) && \
      ((1UL << curveName) & curvemsk) != 0)
 static SECStatus ssl3_CreateECDHEphemeralKeys(sslSocket *ss, ECName ec_curve);
 #define supportedCurve(x) (((x) > ec_noName) && ((x) < ec_pastLastName))
 /* Table containing OID tags for elliptic curves named in the
  * ECC-TLS IETF draft.
  */
 static const SECOidTag ecName2OIDTag[] = {
 ,
         SEC_OID_SECG_EC_SECT163K1,  /*  1 */
         SEC_OID_SECG_EC_SECT163R1,  /*  2 */
         SEC_OID_SECG_EC_SECT163R2,  /*  3 */
         SEC_OID_SECG_EC_SECT193R1,  /*  4 */
         SEC_OID_SECG_EC_SECT193R2,  /*  5 */
         SEC_OID_SECG_EC_SECT233K1,  /*  6 */
         SEC_OID_SECG_EC_SECT233R1,  /*  7 */
         SEC_OID_SECG_EC_SECT239K1,  /*  8 */
         SEC_OID_SECG_EC_SECT283K1,  /*  9 */
         SEC_OID_SECG_EC_SECT283R1,  /* 10 */
         SEC_OID_SECG_EC_SECT409K1,  /* 11 */
         SEC_OID_SECG_EC_SECT409R1,  /* 12 */
         SEC_OID_SECG_EC_SECT571K1,  /* 13 */
         SEC_OID_SECG_EC_SECT571R1,  /* 14 */
         SEC_OID_SECG_EC_SECP160K1,  /* 15 */
         SEC_OID_SECG_EC_SECP160R1,  /* 16 */
         SEC_OID_SECG_EC_SECP160R2,  /* 17 */
         SEC_OID_SECG_EC_SECP192K1,  /* 18 */
         SEC_OID_SECG_EC_SECP192R1,  /* 19 */
         SEC_OID_SECG_EC_SECP224K1,  /* 20 */
         SEC_OID_SECG_EC_SECP224R1,  /* 21 */
         SEC_OID_SECG_EC_SECP256K1,  /* 22 */
         SEC_OID_SECG_EC_SECP256R1,  /* 23 */
         SEC_OID_SECG_EC_SECP384R1,  /* 24 */
         SEC_OID_SECG_EC_SECP521R1,  /* 25 */
 };
 static const PRUint16 curve2bits[] = {
 , /*  ec_noName     = 0,   */
 , /*  ec_sect163k1  = 1,   */
 , /*  ec_sect163r1  = 2,   */
 , /*  ec_sect163r2  = 3,   */
 , /*  ec_sect193r1  = 4,   */
 , /*  ec_sect193r2  = 5,   */
 , /*  ec_sect233k1  = 6,   */
 , /*  ec_sect233r1  = 7,   */
 , /*  ec_sect239k1  = 8,   */
 , /*  ec_sect283k1  = 9,   */
 , /*  ec_sect283r1  = 10,  */
 , /*  ec_sect409k1  = 11,  */
 , /*  ec_sect409r1  = 12,  */
 , /*  ec_sect571k1  = 13,  */
 , /*  ec_sect571r1  = 14,  */
 , /*  ec_secp160k1  = 15,  */
 , /*  ec_secp160r1  = 16,  */
 , /*  ec_secp160r2  = 17,  */
 , /*  ec_secp192k1  = 18,  */
 , /*  ec_secp192r1  = 19,  */
 , /*  ec_secp224k1  = 20,  */
 , /*  ec_secp224r1  = 21,  */
 , /*  ec_secp256k1  = 22,  */
 , /*  ec_secp256r1  = 23,  */
 , /*  ec_secp384r1  = 24,  */
 , /*  ec_secp521r1  = 25,  */
 /*  ec_pastLastName      */
 };
 typedef struct Bits2CurveStr {
     PRUint16    bits;
     ECName      curve;
 } Bits2Curve;
 static const Bits2Curve bits2curve [] = {
    {    192,     ec_secp192r1    /*  = 19,  fast */  },
    {    160,     ec_secp160r2    /*  = 17,  fast */  },
    {    160,     ec_secp160k1    /*  = 15,  */       },
    {    160,     ec_secp160r1    /*  = 16,  */       },
    {    163,     ec_sect163k1    /*  = 1,   */       },
    {    163,     ec_sect163r1    /*  = 2,   */       },
    {    163,     ec_sect163r2    /*  = 3,   */       },
    {    192,     ec_secp192k1    /*  = 18,  */       },
    {    193,     ec_sect193r1    /*  = 4,   */       },
    {    193,     ec_sect193r2    /*  = 5,   */       },
    {    224,     ec_secp224r1    /*  = 21,  fast */  },
    {    224,     ec_secp224k1    /*  = 20,  */       },
    {    233,     ec_sect233k1    /*  = 6,   */       },
    {    233,     ec_sect233r1    /*  = 7,   */       },
    {    239,     ec_sect239k1    /*  = 8,   */       },
    {    256,     ec_secp256r1    /*  = 23,  fast */  },
    {    256,     ec_secp256k1    /*  = 22,  */       },
    {    283,     ec_sect283k1    /*  = 9,   */       },
    {    283,     ec_sect283r1    /*  = 10,  */       },
    {    384,     ec_secp384r1    /*  = 24,  fast */  },
    {    409,     ec_sect409k1    /*  = 11,  */       },
    {    409,     ec_sect409r1    /*  = 12,  */       },
    {    521,     ec_secp521r1    /*  = 25,  fast */  },
    {    571,     ec_sect571k1    /*  = 13,  */       },
    {    571,     ec_sect571r1    /*  = 14,  */       },
    {  65535,     ec_noName    }
 };
 typedef struct ECDHEKeyPairStr {
     ssl3KeyPair *  pair;
     int            error;  /* error code of the call-once function */
     PRCallOnceType once;
 } ECDHEKeyPair;
 /* arrays of ECDHE KeyPairs */
 static ECDHEKeyPair gECDHEKeyPairs[ec_pastLastName];
 SECStatus
 ssl3_ECName2Params(PLArenaPool * arena, ECName curve, SECKEYECParams * params)
 {
     SECOidData *oidData = NULL;
     if ((curve <= ec_noName) || (curve >= ec_pastLastName) ||
         ((oidData = SECOID_FindOIDByTag(ecName2OIDTag[curve])) == NULL)) {
         PORT_SetError(SEC_ERROR_UNSUPPORTED_ELLIPTIC_CURVE);
         return SECFailure;
     }
     SECITEM_AllocItem(arena, params, (2 + oidData->oid.len));
     /*
      * params->data needs to contain the ASN encoding of an object ID (OID)
      * representing the named curve. The actual OID is in
      * oidData->oid.data so we simply prepend 0x06 and OID length
      */
     params->data[0] = SEC_ASN1_OBJECT_ID;
     params->data[1] = oidData->oid.len;
     memcpy(params->data + 2, oidData->oid.data, oidData->oid.len);
     return SECSuccess;
 }
 static ECName
 params2ecName(SECKEYECParams * params)
 {
     SECItem oid = { siBuffer, NULL, 0};
     SECOidData *oidData = NULL;
     ECName i;
     /*
      * params->data needs to contain the ASN encoding of an object ID (OID)
      * representing a named curve. Here, we strip away everything
      * before the actual OID and use the OID to look up a named curve.
      */
     if (params->data[0] != SEC_ASN1_OBJECT_ID) return ec_noName;
     oid.len = params->len - 2;
     oid.data = params->data + 2;
     if ((oidData = SECOID_FindOID(&oid)) == NULL) return ec_noName;
     for (i = ec_noName + 1; i < ec_pastLastName; i++) {
         if (ecName2OIDTag[i] == oidData->offset)
             return i;
     }
     return ec_noName;
 }
 /* Caller must set hiLevel error code. */
 static SECStatus
 ssl3_ComputeECDHKeyHash(SECOidTag hashAlg,
                         SECItem ec_params, SECItem server_ecpoint,
                         SSL3Random *client_rand, SSL3Random *server_rand,
                         SSL3Hashes *hashes, PRBool bypassPKCS11)
 {
     PRUint8     * hashBuf;
     PRUint8     * pBuf;
     SECStatus     rv            = SECSuccess;
     unsigned int  bufLen;
     /*
      * XXX For now, we only support named curves (the appropriate
      * checks are made before this method is called) so ec_params
      * takes up only two bytes. ECPoint needs to fit in 256 bytes
      * (because the spec says the length must fit in one byte)
      */
     PRUint8       buf[2*SSL3_RANDOM_LENGTH + 2 + 1 + 256];
     bufLen = 2*SSL3_RANDOM_LENGTH + ec_params.len + 1 + server_ecpoint.len;
     if (bufLen <= sizeof buf) {
         hashBuf = buf;
     } else {
         hashBuf = PORT_Alloc(bufLen);
         if (!hashBuf) {
             return SECFailure;
         }
     }
     memcpy(hashBuf, client_rand, SSL3_RANDOM_LENGTH);
         pBuf = hashBuf + SSL3_RANDOM_LENGTH;
     memcpy(pBuf, server_rand, SSL3_RANDOM_LENGTH);
         pBuf += SSL3_RANDOM_LENGTH;
     memcpy(pBuf, ec_params.data, ec_params.len);
         pBuf += ec_params.len;
     pBuf[0] = (PRUint8)(server_ecpoint.len);
     pBuf += 1;
     memcpy(pBuf, server_ecpoint.data, server_ecpoint.len);
         pBuf += server_ecpoint.len;
     PORT_Assert((unsigned int)(pBuf - hashBuf) == bufLen);
     rv = ssl3_ComputeCommonKeyHash(hashAlg, hashBuf, bufLen, hashes,
                                    bypassPKCS11);
     PRINT_BUF(95, (NULL, "ECDHkey hash: ", hashBuf, bufLen));
     PRINT_BUF(95, (NULL, "ECDHkey hash: MD5 result",
               hashes->u.s.md5, MD5_LENGTH));
     PRINT_BUF(95, (NULL, "ECDHkey hash: SHA1 result",
               hashes->u.s.sha, SHA1_LENGTH));
     if (hashBuf != buf)
         PORT_Free(hashBuf);
     return rv;
 }
 /* Called from ssl3_SendClientKeyExchange(). */
 SECStatus
 ssl3_SendECDHClientKeyExchange(sslSocket * ss, SECKEYPublicKey * svrPubKey)
 {
     PK11SymKey *        pms             = NULL;
     SECStatus           rv              = SECFailure;
     PRBool              isTLS, isTLS12;
     CK_MECHANISM_TYPE   target;
     SECKEYPublicKey     *pubKey = NULL;         /* Ephemeral ECDH key */
     SECKEYPrivateKey    *privKey = NULL;        /* Ephemeral ECDH key */
     PORT_Assert( ss->opt.noLocks || ssl_HaveSSL3HandshakeLock(ss) );
     PORT_Assert( ss->opt.noLocks || ssl_HaveXmitBufLock(ss));
     isTLS = (PRBool)(ss->ssl3.pwSpec->version > SSL_LIBRARY_VERSION_3_0);
     isTLS12 = (PRBool)(ss->ssl3.pwSpec->version >= SSL_LIBRARY_VERSION_TLS_1_2);
     /* Generate ephemeral EC keypair */
     if (svrPubKey->keyType != ecKey) {
         PORT_SetError(SEC_ERROR_BAD_KEY);
         goto loser;
     }
     /* XXX SHOULD CALL ssl3_CreateECDHEphemeralKeys here, instead! */
     privKey = SECKEY_CreateECPrivateKey(&svrPubKey->u.ec.DEREncodedParams,
                                         &pubKey, ss->pkcs11PinArg);
     if (!privKey || !pubKey) {
             ssl_MapLowLevelError(SEC_ERROR_KEYGEN_FAIL);
             rv = SECFailure;
             goto loser;
     }
     PRINT_BUF(50, (ss, "ECDH public value:",
                                         pubKey->u.ec.publicValue.data,
                                         pubKey->u.ec.publicValue.len));
     if (isTLS12) {
         target = CKM_NSS_TLS_MASTER_KEY_DERIVE_DH_SHA256;
     } else if (isTLS) {
         target = CKM_TLS_MASTER_KEY_DERIVE_DH;
     } else {
         target = CKM_SSL3_MASTER_KEY_DERIVE_DH;
     }
     /*  Determine the PMS */
     pms = PK11_PubDeriveWithKDF(privKey, svrPubKey, PR_FALSE, NULL, NULL,
                             CKM_ECDH1_DERIVE, target, CKA_DERIVE, 0,
                             CKD_NULL, NULL, NULL);
     if (pms == NULL) {
         SSL3AlertDescription desc  = illegal_parameter;
         (void)SSL3_SendAlert(ss, alert_fatal, desc);
         ssl_MapLowLevelError(SSL_ERROR_CLIENT_KEY_EXCHANGE_FAILURE);
         goto loser;
     }
     SECKEY_DestroyPrivateKey(privKey);
     privKey = NULL;
     rv = ssl3_InitPendingCipherSpec(ss,  pms);
     PK11_FreeSymKey(pms); pms = NULL;
     if (rv != SECSuccess) {
         ssl_MapLowLevelError(SSL_ERROR_CLIENT_KEY_EXCHANGE_FAILURE);
         goto loser;
     }
     rv = ssl3_AppendHandshakeHeader(ss, client_key_exchange,
                                         pubKey->u.ec.publicValue.len + 1);
     if (rv != SECSuccess) {
         goto loser;     /* err set by ssl3_AppendHandshake* */
     }
     rv = ssl3_AppendHandshakeVariable(ss,
                                         pubKey->u.ec.publicValue.data,
                                         pubKey->u.ec.publicValue.len, 1);
     SECKEY_DestroyPublicKey(pubKey);
     pubKey = NULL;
     if (rv != SECSuccess) {
         goto loser;     /* err set by ssl3_AppendHandshake* */
     }
     rv = SECSuccess;
 loser:
     if(pms) PK11_FreeSymKey(pms);
     if(privKey) SECKEY_DestroyPrivateKey(privKey);
     if(pubKey) SECKEY_DestroyPublicKey(pubKey);
     return rv;
 }
 /*
 ** Called from ssl3_HandleClientKeyExchange()
 */
 SECStatus
 ssl3_HandleECDHClientKeyExchange(sslSocket *ss, SSL3Opaque *b,
                                      PRUint32 length,
                                      SECKEYPublicKey *srvrPubKey,
                                      SECKEYPrivateKey *srvrPrivKey)
 {
     PK11SymKey *      pms;
     SECStatus         rv;
     SECKEYPublicKey   clntPubKey;
     CK_MECHANISM_TYPE   target;
     PRBool isTLS, isTLS12;
     PORT_Assert( ss->opt.noLocks || ssl_HaveRecvBufLock(ss) );
     PORT_Assert( ss->opt.noLocks || ssl_HaveSSL3HandshakeLock(ss) );
     clntPubKey.keyType = ecKey;
     clntPubKey.u.ec.DEREncodedParams.len =
         srvrPubKey->u.ec.DEREncodedParams.len;
     clntPubKey.u.ec.DEREncodedParams.data =
         srvrPubKey->u.ec.DEREncodedParams.data;
     rv = ssl3_ConsumeHandshakeVariable(ss, &clntPubKey.u.ec.publicValue,
 , &b, &length);
     if (rv != SECSuccess) {
         SEND_ALERT
         return SECFailure;      /* XXX Who sets the error code?? */
     }
     isTLS = (PRBool)(ss->ssl3.prSpec->version > SSL_LIBRARY_VERSION_3_0);
     isTLS12 = (PRBool)(ss->ssl3.prSpec->version >= SSL_LIBRARY_VERSION_TLS_1_2);
     if (isTLS12) {
         target = CKM_NSS_TLS_MASTER_KEY_DERIVE_DH_SHA256;
     } else if (isTLS) {
         target = CKM_TLS_MASTER_KEY_DERIVE_DH;
     } else {
         target = CKM_SSL3_MASTER_KEY_DERIVE_DH;
     }
     /*  Determine the PMS */
     pms = PK11_PubDeriveWithKDF(srvrPrivKey, &clntPubKey, PR_FALSE, NULL, NULL,
                             CKM_ECDH1_DERIVE, target, CKA_DERIVE, 0,
                             CKD_NULL, NULL, NULL);
     if (pms == NULL) {
         /* last gasp.  */
         ssl_MapLowLevelError(SSL_ERROR_CLIENT_KEY_EXCHANGE_FAILURE);
         return SECFailure;
     }
     rv = ssl3_InitPendingCipherSpec(ss,  pms);
     PK11_FreeSymKey(pms);
     if (rv != SECSuccess) {
         SEND_ALERT
         return SECFailure; /* error code set by ssl3_InitPendingCipherSpec */
     }
     return SECSuccess;
 }
 ECName
 ssl3_GetCurveWithECKeyStrength(PRUint32 curvemsk, int requiredECCbits)
 {
     int    i;
     for ( i = 0; bits2curve[i].curve != ec_noName; i++) {
         if (bits2curve[i].bits < requiredECCbits)
             continue;
         if (SSL_IS_CURVE_NEGOTIATED(curvemsk, bits2curve[i].curve)) {
             return bits2curve[i].curve;
         }
     }
     PORT_SetError(SSL_ERROR_NO_CYPHER_OVERLAP);
     return ec_noName;
 }
 /* find the "weakest link".  Get strength of signature key and of sym key.
  * choose curve for the weakest of those two.
  */
 ECName
 ssl3_GetCurveNameForServerSocket(sslSocket *ss)
 {
     SECKEYPublicKey * svrPublicKey = NULL;
     ECName ec_curve = ec_noName;
     int    signatureKeyStrength = 521;
     int    requiredECCbits = ss->sec.secretKeyBits * 2;
     if (ss->ssl3.hs.kea_def->kea == kea_ecdhe_ecdsa) {
         svrPublicKey = SSL_GET_SERVER_PUBLIC_KEY(ss, kt_ecdh);
         if (svrPublicKey)
             ec_curve = params2ecName(&svrPublicKey->u.ec.DEREncodedParams);
         if (!SSL_IS_CURVE_NEGOTIATED(ss->ssl3.hs.negotiatedECCurves, ec_curve)) {
             PORT_SetError(SSL_ERROR_NO_CYPHER_OVERLAP);
             return ec_noName;
         }
         signatureKeyStrength = curve2bits[ ec_curve ];
     } else {
         /* RSA is our signing cert */
         int serverKeyStrengthInBits;
         svrPublicKey = SSL_GET_SERVER_PUBLIC_KEY(ss, kt_rsa);
         if (!svrPublicKey) {
             PORT_SetError(SSL_ERROR_NO_CYPHER_OVERLAP);
             return ec_noName;
         }
         /* currently strength in bytes */
         serverKeyStrengthInBits = svrPublicKey->u.rsa.modulus.len;
         if (svrPublicKey->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;
     return ssl3_GetCurveWithECKeyStrength(ss->ssl3.hs.negotiatedECCurves,
                                           requiredECCbits);
 }
 /* function to clear out the lists */
 static SECStatus
 ssl3_ShutdownECDHECurves(void *appData, void *nssData)
 {
     int i;
     ECDHEKeyPair *keyPair = &gECDHEKeyPairs[0];
     for (i=0; i < ec_pastLastName; i++, keyPair++) {
         if (keyPair->pair) {
             ssl3_FreeKeyPair(keyPair->pair);
         }
     }
     memset(gECDHEKeyPairs, 0, sizeof gECDHEKeyPairs);
     return SECSuccess;
 }
 static PRStatus
 ssl3_ECRegister(void)
 {
     SECStatus rv;
     rv = NSS_RegisterShutdown(ssl3_ShutdownECDHECurves, gECDHEKeyPairs);
     if (rv != SECSuccess) {
         gECDHEKeyPairs[ec_noName].error = PORT_GetError();
     }
     return (PRStatus)rv;
 }
 /* CallOnce function, called once for each named curve. */
 static PRStatus
 ssl3_CreateECDHEphemeralKeyPair(void * arg)
 {
     SECKEYPrivateKey *    privKey  = NULL;
     SECKEYPublicKey *     pubKey   = NULL;
     ssl3KeyPair *         keyPair  = NULL;
     ECName                ec_curve = (ECName)arg;
     SECKEYECParams        ecParams = { siBuffer, NULL, 0 };
     PORT_Assert(gECDHEKeyPairs[ec_curve].pair == NULL);
     /* ok, no one has generated a global key for this curve yet, do so */
     if (ssl3_ECName2Params(NULL, ec_curve, &ecParams) != SECSuccess) {
         gECDHEKeyPairs[ec_curve].error = PORT_GetError();
         return PR_FAILURE;
     }
     privKey = SECKEY_CreateECPrivateKey(&ecParams, &pubKey, NULL);
     SECITEM_FreeItem(&ecParams, PR_FALSE);
     if (!privKey || !pubKey || !(keyPair = ssl3_NewKeyPair(privKey, pubKey))) {
         if (privKey) {
             SECKEY_DestroyPrivateKey(privKey);
         }
         if (pubKey) {
             SECKEY_DestroyPublicKey(pubKey);
         }
         ssl_MapLowLevelError(SEC_ERROR_KEYGEN_FAIL);
         gECDHEKeyPairs[ec_curve].error = PORT_GetError();
         return PR_FAILURE;
     }
     gECDHEKeyPairs[ec_curve].pair = keyPair;
     return PR_SUCCESS;
 }
 /*
  * Creates the ephemeral public and private ECDH keys used by
  * server in ECDHE_RSA and ECDHE_ECDSA handshakes.
  * For now, the elliptic curve is chosen to be the same
  * strength as the signing certificate (ECC or RSA).
  * We need an API to specify the curve. This won't be a real
  * issue until we further develop server-side support for ECC
  * cipher suites.
  */
 static SECStatus
 ssl3_CreateECDHEphemeralKeys(sslSocket *ss, ECName ec_curve)
 {
     ssl3KeyPair *         keyPair        = NULL;
     /* if there's no global key for this curve, make one. */
     if (gECDHEKeyPairs[ec_curve].pair == NULL) {
         PRStatus status;
         status = PR_CallOnce(&gECDHEKeyPairs[ec_noName].once, ssl3_ECRegister);
         if (status != PR_SUCCESS) {
             PORT_SetError(gECDHEKeyPairs[ec_noName].error);
             return SECFailure;
         }
         status = PR_CallOnceWithArg(&gECDHEKeyPairs[ec_curve].once,
                                     ssl3_CreateECDHEphemeralKeyPair,
                                     (void *)ec_curve);
         if (status != PR_SUCCESS) {
             PORT_SetError(gECDHEKeyPairs[ec_curve].error);
             return SECFailure;
         }
     }
     keyPair = gECDHEKeyPairs[ec_curve].pair;
     PORT_Assert(keyPair != NULL);
     if (!keyPair)
         return SECFailure;
     ss->ephemeralECDHKeyPair = ssl3_GetKeyPairRef(keyPair);
     return SECSuccess;
 }
 SECStatus
 ssl3_HandleECDHServerKeyExchange(sslSocket *ss, SSL3Opaque *b, PRUint32 length)
 {
     PLArenaPool *    arena     = NULL;
     SECKEYPublicKey *peerKey   = NULL;
     PRBool           isTLS, isTLS12;
     SECStatus        rv;
     int              errCode   = SSL_ERROR_RX_MALFORMED_SERVER_KEY_EXCH;
     SSL3AlertDescription desc  = illegal_parameter;
     SSL3Hashes       hashes;
     SECItem          signature = {siBuffer, NULL, 0};
     SECItem          ec_params = {siBuffer, NULL, 0};
     SECItem          ec_point  = {siBuffer, NULL, 0};
     unsigned char    paramBuf[3]; /* only for curve_type == named_curve */
     SSL3SignatureAndHashAlgorithm sigAndHash;
     sigAndHash.hashAlg = SEC_OID_UNKNOWN;
     isTLS = (PRBool)(ss->ssl3.prSpec->version > SSL_LIBRARY_VERSION_3_0);
     isTLS12 = (PRBool)(ss->ssl3.prSpec->version >= SSL_LIBRARY_VERSION_TLS_1_2);
     /* XXX This works only for named curves, revisit this when
      * we support generic curves.
      */
     ec_params.len  = sizeof paramBuf;
     ec_params.data = paramBuf;
     rv = ssl3_ConsumeHandshake(ss, ec_params.data, ec_params.len, &b, &length);
     if (rv != SECSuccess) {
         goto loser;             /* malformed. */
     }
     /* Fail if the curve is not a named curve */
     if ((ec_params.data[0] != ec_type_named) ||
         (ec_params.data[1] != 0) ||
         !supportedCurve(ec_params.data[2])) {
             errCode = SEC_ERROR_UNSUPPORTED_ELLIPTIC_CURVE;
             desc = handshake_failure;
             goto alert_loser;
     }
     rv = ssl3_ConsumeHandshakeVariable(ss, &ec_point, 1, &b, &length);
     if (rv != SECSuccess) {
         goto loser;             /* malformed. */
     }
     /* Fail if the ec point uses compressed representation */
     if (ec_point.data[0] != EC_POINT_FORM_UNCOMPRESSED) {
             errCode = SEC_ERROR_UNSUPPORTED_EC_POINT_FORM;
             desc = handshake_failure;
             goto alert_loser;
     }
     if (isTLS12) {
         rv = ssl3_ConsumeSignatureAndHashAlgorithm(ss, &b, &length,
                                                    &sigAndHash);
         if (rv != SECSuccess) {
             goto loser;         /* malformed or unsupported. */
         }
         rv = ssl3_CheckSignatureAndHashAlgorithmConsistency(
                 &sigAndHash, ss->sec.peerCert);
         if (rv != SECSuccess) {
             goto loser;
         }
     }
     rv = ssl3_ConsumeHandshakeVariable(ss, &signature, 2, &b, &length);
     if (rv != SECSuccess) {
         goto loser;             /* malformed. */
     }
     if (length != 0) {
         if (isTLS)
             desc = decode_error;
         goto alert_loser;               /* malformed. */
     }
     PRINT_BUF(60, (NULL, "Server EC params", ec_params.data,
         ec_params.len));
     PRINT_BUF(60, (NULL, "Server EC point", ec_point.data, ec_point.len));
     /* failures after this point are not malformed handshakes. */
     /* TLS: send decrypt_error if signature failed. */
     desc = isTLS ? decrypt_error : handshake_failure;
     /*
      *  check to make sure the hash is signed by right guy
      */
     rv = ssl3_ComputeECDHKeyHash(sigAndHash.hashAlg, ec_params, ec_point,
                                  &ss->ssl3.hs.client_random,
                                  &ss->ssl3.hs.server_random,
                                  &hashes, ss->opt.bypassPKCS11);
     if (rv != SECSuccess) {
         errCode =
             ssl_MapLowLevelError(SSL_ERROR_SERVER_KEY_EXCHANGE_FAILURE);
         goto alert_loser;
     }
     rv = ssl3_VerifySignedHashes(&hashes, ss->sec.peerCert, &signature,
                                 isTLS, ss->pkcs11PinArg);
     if (rv != SECSuccess)  {
         errCode =
             ssl_MapLowLevelError(SSL_ERROR_SERVER_KEY_EXCHANGE_FAILURE);
         goto alert_loser;
     }
     arena = PORT_NewArena(DER_DEFAULT_CHUNKSIZE);
     if (arena == NULL) {
         goto no_memory;
     }
     ss->sec.peerKey = peerKey = PORT_ArenaZNew(arena, SECKEYPublicKey);
     if (peerKey == NULL) {
         goto no_memory;
     }
     peerKey->arena                 = arena;
     peerKey->keyType               = ecKey;
     /* set up EC parameters in peerKey */
     if (ssl3_ECName2Params(arena, ec_params.data[2],
             &peerKey->u.ec.DEREncodedParams) != SECSuccess) {
         /* we should never get here since we already
          * checked that we are dealing with a supported curve
          */
         errCode = SEC_ERROR_UNSUPPORTED_ELLIPTIC_CURVE;
         goto alert_loser;
     }
     /* copy publicValue in peerKey */
     if (SECITEM_CopyItem(arena, &peerKey->u.ec.publicValue,  &ec_point))
     {
         PORT_FreeArena(arena, PR_FALSE);
         goto no_memory;
     }
     peerKey->pkcs11Slot         = NULL;
     peerKey->pkcs11ID           = CK_INVALID_HANDLE;
     ss->sec.peerKey = peerKey;
     ss->ssl3.hs.ws = wait_cert_request;
     return SECSuccess;
 alert_loser:
     (void)SSL3_SendAlert(ss, alert_fatal, desc);
 loser:
     PORT_SetError( errCode );
     return SECFailure;
 no_memory:      /* no-memory error has already been set. */
     ssl_MapLowLevelError(SSL_ERROR_SERVER_KEY_EXCHANGE_FAILURE);
     return SECFailure;
 }
 SECStatus
 ssl3_SendECDHServerKeyExchange(
     sslSocket *ss,
     const SSL3SignatureAndHashAlgorithm *sigAndHash)
 {
     const ssl3KEADef * kea_def     = ss->ssl3.hs.kea_def;
     SECStatus          rv          = SECFailure;
     int                length;
     PRBool             isTLS, isTLS12;
     SECItem            signed_hash = {siBuffer, NULL, 0};
     SSL3Hashes         hashes;
     SECKEYPublicKey *  ecdhePub;
     SECItem            ec_params = {siBuffer, NULL, 0};
     unsigned char      paramBuf[3];
     ECName             curve;
     SSL3KEAType        certIndex;
     /* Generate ephemeral ECDH key pair and send the public key */
     curve = ssl3_GetCurveNameForServerSocket(ss);
     if (curve == ec_noName) {
         goto loser;
     }
     rv = ssl3_CreateECDHEphemeralKeys(ss, curve);
     if (rv != SECSuccess) {
         goto loser;     /* err set by AppendHandshake. */
     }
     ecdhePub = ss->ephemeralECDHKeyPair->pubKey;
     PORT_Assert(ecdhePub != NULL);
     if (!ecdhePub) {
         PORT_SetError(SSL_ERROR_SERVER_KEY_EXCHANGE_FAILURE);
         return SECFailure;
     }
     ec_params.len  = sizeof paramBuf;
     ec_params.data = paramBuf;
     curve = params2ecName(&ecdhePub->u.ec.DEREncodedParams);
     if (curve != ec_noName) {
         ec_params.data[0] = ec_type_named;
         ec_params.data[1] = 0x00;
         ec_params.data[2] = curve;
     } else {
         PORT_SetError(SEC_ERROR_UNSUPPORTED_ELLIPTIC_CURVE);
         goto loser;
     }
     rv = ssl3_ComputeECDHKeyHash(sigAndHash->hashAlg,
                                  ec_params,
                                  ecdhePub->u.ec.publicValue,
                                  &ss->ssl3.hs.client_random,
                                  &ss->ssl3.hs.server_random,
                                  &hashes, ss->opt.bypassPKCS11);
     if (rv != SECSuccess) {
         ssl_MapLowLevelError(SSL_ERROR_SERVER_KEY_EXCHANGE_FAILURE);
         goto loser;
     }
     isTLS = (PRBool)(ss->ssl3.pwSpec->version > SSL_LIBRARY_VERSION_3_0);
     isTLS12 = (PRBool)(ss->ssl3.pwSpec->version >= SSL_LIBRARY_VERSION_TLS_1_2);
     /* XXX SSLKEAType isn't really a good choice for
      * indexing certificates but that's all we have
      * for now.
      */
     if (kea_def->kea == kea_ecdhe_rsa)
         certIndex = kt_rsa;
     else /* kea_def->kea == kea_ecdhe_ecdsa */
         certIndex = kt_ecdh;
     rv = ssl3_SignHashes(&hashes, ss->serverCerts[certIndex].SERVERKEY,
                          &signed_hash, isTLS);
     if (rv != SECSuccess) {
         goto loser;             /* ssl3_SignHashes has set err. */
     }
     if (signed_hash.data == NULL) {
         /* how can this happen and rv == SECSuccess ?? */
         PORT_SetError(SSL_ERROR_SERVER_KEY_EXCHANGE_FAILURE);
         goto loser;
     }
     length = ec_params.len +
 + ecdhePub->u.ec.publicValue.len +
              (isTLS12 ? 2 : 0) + 2 + signed_hash.len;
     rv = ssl3_AppendHandshakeHeader(ss, server_key_exchange, length);
     if (rv != SECSuccess) {
         goto loser;     /* err set by AppendHandshake. */
     }
     rv = ssl3_AppendHandshake(ss, ec_params.data, ec_params.len);
     if (rv != SECSuccess) {
         goto loser;     /* err set by AppendHandshake. */
     }
     rv = ssl3_AppendHandshakeVariable(ss, ecdhePub->u.ec.publicValue.data,
                                       ecdhePub->u.ec.publicValue.len, 1);
     if (rv != SECSuccess) {
         goto loser;     /* err set by AppendHandshake. */
     }
     if (isTLS12) {
         rv = ssl3_AppendSignatureAndHashAlgorithm(ss, sigAndHash);
         if (rv != SECSuccess) {
             goto loser;         /* err set by AppendHandshake. */
         }
     }
     rv = ssl3_AppendHandshakeVariable(ss, signed_hash.data,
                                       signed_hash.len, 2);
     if (rv != SECSuccess) {
         goto loser;     /* err set by AppendHandshake. */
     }
     PORT_Free(signed_hash.data);
     return SECSuccess;
 loser:
     if (signed_hash.data != NULL)
         PORT_Free(signed_hash.data);
     return SECFailure;
 }
 /* Lists of ECC cipher suites for searching and disabling. */
 static const ssl3CipherSuite ecdh_suites[] = {
     TLS_ECDH_ECDSA_WITH_3DES_EDE_CBC_SHA,
     TLS_ECDH_ECDSA_WITH_AES_128_CBC_SHA,
     TLS_ECDH_ECDSA_WITH_AES_256_CBC_SHA,
     TLS_ECDH_ECDSA_WITH_NULL_SHA,
     TLS_ECDH_ECDSA_WITH_RC4_128_SHA,
     TLS_ECDH_RSA_WITH_3DES_EDE_CBC_SHA,
     TLS_ECDH_RSA_WITH_AES_128_CBC_SHA,
     TLS_ECDH_RSA_WITH_AES_256_CBC_SHA,
     TLS_ECDH_RSA_WITH_NULL_SHA,
     TLS_ECDH_RSA_WITH_RC4_128_SHA,
 /* end of list marker */
 };
 static const ssl3CipherSuite ecdh_ecdsa_suites[] = {
     TLS_ECDH_ECDSA_WITH_3DES_EDE_CBC_SHA,
     TLS_ECDH_ECDSA_WITH_AES_128_CBC_SHA,
     TLS_ECDH_ECDSA_WITH_AES_256_CBC_SHA,
     TLS_ECDH_ECDSA_WITH_NULL_SHA,
     TLS_ECDH_ECDSA_WITH_RC4_128_SHA,
 /* end of list marker */
 };
 static const ssl3CipherSuite ecdh_rsa_suites[] = {
     TLS_ECDH_RSA_WITH_3DES_EDE_CBC_SHA,
     TLS_ECDH_RSA_WITH_AES_128_CBC_SHA,
     TLS_ECDH_RSA_WITH_AES_256_CBC_SHA,
     TLS_ECDH_RSA_WITH_NULL_SHA,
     TLS_ECDH_RSA_WITH_RC4_128_SHA,
 /* end of list marker */
 };
 static const ssl3CipherSuite ecdhe_ecdsa_suites[] = {
     TLS_ECDHE_ECDSA_WITH_3DES_EDE_CBC_SHA,
     TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA,
     TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256,
     TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
     TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA,
     TLS_ECDHE_ECDSA_WITH_NULL_SHA,
     TLS_ECDHE_ECDSA_WITH_RC4_128_SHA,
 /* end of list marker */
 };
 static const ssl3CipherSuite ecdhe_rsa_suites[] = {
     TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA,
     TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA,
     TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256,
     TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,
     TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA,
     TLS_ECDHE_RSA_WITH_NULL_SHA,
     TLS_ECDHE_RSA_WITH_RC4_128_SHA,
 /* end of list marker */
 };
 /* List of all ECC cipher suites */
 static const ssl3CipherSuite ecSuites[] = {
     TLS_ECDHE_ECDSA_WITH_3DES_EDE_CBC_SHA,
     TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA,
     TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256,
     TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
     TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA,
     TLS_ECDHE_ECDSA_WITH_NULL_SHA,
     TLS_ECDHE_ECDSA_WITH_RC4_128_SHA,
     TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA,
     TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA,
     TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256,
     TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,
     TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA,
     TLS_ECDHE_RSA_WITH_NULL_SHA,
     TLS_ECDHE_RSA_WITH_RC4_128_SHA,
     TLS_ECDH_ECDSA_WITH_3DES_EDE_CBC_SHA,
     TLS_ECDH_ECDSA_WITH_AES_128_CBC_SHA,
     TLS_ECDH_ECDSA_WITH_AES_256_CBC_SHA,
     TLS_ECDH_ECDSA_WITH_NULL_SHA,
     TLS_ECDH_ECDSA_WITH_RC4_128_SHA,
     TLS_ECDH_RSA_WITH_3DES_EDE_CBC_SHA,
     TLS_ECDH_RSA_WITH_AES_128_CBC_SHA,
     TLS_ECDH_RSA_WITH_AES_256_CBC_SHA,
     TLS_ECDH_RSA_WITH_NULL_SHA,
     TLS_ECDH_RSA_WITH_RC4_128_SHA,
 /* end of list marker */
 };
 /* On this socket, Disable the ECC cipher suites in the argument's list */
 SECStatus
 ssl3_DisableECCSuites(sslSocket * ss, const ssl3CipherSuite * suite)
 {
     if (!suite)
         suite = ecSuites;
     for (; *suite; ++suite) {
         SECStatus rv      = ssl3_CipherPrefSet(ss, *suite, PR_FALSE);
         PORT_Assert(rv == SECSuccess); /* else is coding error */
     }
     return SECSuccess;
 }
 /* Look at the server certs configured on this socket, and disable any
  * ECC cipher suites that are not supported by those certs.
  */
 void
 ssl3_FilterECCipherSuitesByServerCerts(sslSocket * ss)
 {
     CERTCertificate * svrCert;
     svrCert = ss->serverCerts[kt_rsa].serverCert;
     if (!svrCert) {
         ssl3_DisableECCSuites(ss, ecdhe_rsa_suites);
     }
     svrCert = ss->serverCerts[kt_ecdh].serverCert;
     if (!svrCert) {
         ssl3_DisableECCSuites(ss, ecdh_suites);
         ssl3_DisableECCSuites(ss, ecdhe_ecdsa_suites);
     } else {
         SECOidTag sigTag = SECOID_GetAlgorithmTag(&svrCert->signature);
         switch (sigTag) {
         case SEC_OID_PKCS1_RSA_ENCRYPTION:
         case SEC_OID_PKCS1_MD2_WITH_RSA_ENCRYPTION:
         case SEC_OID_PKCS1_MD4_WITH_RSA_ENCRYPTION:
         case SEC_OID_PKCS1_MD5_WITH_RSA_ENCRYPTION:
         case SEC_OID_PKCS1_SHA1_WITH_RSA_ENCRYPTION:
         case SEC_OID_PKCS1_SHA224_WITH_RSA_ENCRYPTION:
         case SEC_OID_PKCS1_SHA256_WITH_RSA_ENCRYPTION:
         case SEC_OID_PKCS1_SHA384_WITH_RSA_ENCRYPTION:
         case SEC_OID_PKCS1_SHA512_WITH_RSA_ENCRYPTION:
             ssl3_DisableECCSuites(ss, ecdh_ecdsa_suites);
             break;
         case SEC_OID_ANSIX962_ECDSA_SHA1_SIGNATURE:
         case SEC_OID_ANSIX962_ECDSA_SHA224_SIGNATURE:
         case SEC_OID_ANSIX962_ECDSA_SHA256_SIGNATURE:
         case SEC_OID_ANSIX962_ECDSA_SHA384_SIGNATURE:
         case SEC_OID_ANSIX962_ECDSA_SHA512_SIGNATURE:
         case SEC_OID_ANSIX962_ECDSA_SIGNATURE_RECOMMENDED_DIGEST:
         case SEC_OID_ANSIX962_ECDSA_SIGNATURE_SPECIFIED_DIGEST:
             ssl3_DisableECCSuites(ss, ecdh_rsa_suites);
             break;
         default:
             ssl3_DisableECCSuites(ss, ecdh_suites);
             break;
         }
     }
 }
 /* Ask: is ANY ECC cipher suite enabled on this socket? */
 /* Order(N^2).  Yuk.  Also, this ignores export policy. */
 PRBool
 ssl3_IsECCEnabled(sslSocket * ss)
 {
     const ssl3CipherSuite * suite;
     PK11SlotInfo *slot;
     /* make sure we can do ECC */
     slot = PK11_GetBestSlot(CKM_ECDH1_DERIVE,  ss->pkcs11PinArg);
     if (!slot) {
         return PR_FALSE;
     }
     PK11_FreeSlot(slot);
     /* make sure an ECC cipher is enabled */
     for (suite = ecSuites; *suite; ++suite) {
         PRBool    enabled = PR_FALSE;
         SECStatus rv      = ssl3_CipherPrefGet(ss, *suite, &enabled);
         PORT_Assert(rv == SECSuccess); /* else is coding error */
         if (rv == SECSuccess && enabled)
             return PR_TRUE;
     }
     return PR_FALSE;
 }
 #define BE(n) 0, n
 /* Prefabricated TLS client hello extension, Elliptic Curves List,
  * offers only 3 curves, the Suite B curves, 23-25
  */
 static const PRUint8 suiteBECList[12] = {
     BE(10),         /* Extension type */
     BE( 8),         /* octets that follow ( 3 pairs + 1 length pair) */
     BE( 6),         /* octets that follow ( 3 pairs) */
     BE(23), BE(24), BE(25)
 };
 /* Prefabricated TLS client hello extension, Elliptic Curves List,
  * offers curves 1-25.
  */
 static const PRUint8 tlsECList[56] = {
     BE(10),         /* Extension type */
     BE(52),         /* octets that follow (25 pairs + 1 length pair) */
     BE(50),         /* octets that follow (25 pairs) */
             BE( 1), BE( 2), BE( 3), BE( 4), BE( 5), BE( 6), BE( 7),
     BE( 8), BE( 9), BE(10), BE(11), BE(12), BE(13), BE(14), BE(15),
     BE(16), BE(17), BE(18), BE(19), BE(20), BE(21), BE(22), BE(23),
     BE(24), BE(25)
 };
 static const PRUint8 ecPtFmt[6] = {
     BE(11),         /* Extension type */
     BE( 2),         /* octets that follow */
 ,     /* octets that follow */
 /* uncompressed type only */
 };
 /* This function already presumes we can do ECC, ssl3_IsECCEnabled must be
  * called before this function. It looks to see if we have a token which
  * is capable of doing smaller than SuiteB curves. If the token can, we
  * presume the token can do the whole SSL suite of curves. If it can't we
  * presume the token that allowed ECC to be enabled can only do suite B
  * curves. */
 static PRBool
 ssl3_SuiteBOnly(sslSocket *ss)
 {
     /* See if we can support small curves (like 163). If not, assume we can
      * only support Suite-B curves (P-256, P-384, P-521). */
     PK11SlotInfo *slot =
         PK11_GetBestSlotWithAttributes(CKM_ECDH1_DERIVE, 0, 163,
                                        ss ? ss->pkcs11PinArg : NULL);
     if (!slot) {
         /* nope, presume we can only do suite B */
         return PR_TRUE;
     }
     /* we can, presume we can do all curves */
     PK11_FreeSlot(slot);
     return PR_FALSE;
 }
 /* Send our "canned" (precompiled) Supported Elliptic Curves extension,
  * which says that we support all TLS-defined named curves.
  */
 PRInt32
 ssl3_SendSupportedCurvesXtn(
                         sslSocket * ss,
                         PRBool      append,
                         PRUint32    maxBytes)
 {
     PRInt32 ecListSize = 0;
     const PRUint8 *ecList = NULL;
     if (!ss || !ssl3_IsECCEnabled(ss))
         return 0;
     if (ssl3_SuiteBOnly(ss)) {
         ecListSize = sizeof suiteBECList;
         ecList = suiteBECList;
     } else {
         ecListSize = sizeof tlsECList;
         ecList = tlsECList;
     }
     if (append && maxBytes >= ecListSize) {
         SECStatus rv = ssl3_AppendHandshake(ss, ecList, ecListSize);
         if (rv != SECSuccess)
             return -1;
         if (!ss->sec.isServer) {
             TLSExtensionData *xtnData = &ss->xtnData;
             xtnData->advertised[xtnData->numAdvertised++] =
                 ssl_elliptic_curves_xtn;
         }
     }
     return ecListSize;
 }
 PRUint32
 ssl3_GetSupportedECCurveMask(sslSocket *ss)
 {
     if (ssl3_SuiteBOnly(ss)) {
         return SSL3_SUITE_B_SUPPORTED_CURVES_MASK;
     }
     return SSL3_ALL_SUPPORTED_CURVES_MASK;
 }
 /* Send our "canned" (precompiled) Supported Point Formats extension,
  * which says that we only support uncompressed points.
  */
 PRInt32
 ssl3_SendSupportedPointFormatsXtn(
                         sslSocket * ss,
                         PRBool      append,
                         PRUint32    maxBytes)
 {
     if (!ss || !ssl3_IsECCEnabled(ss))
         return 0;
     if (append && maxBytes >= (sizeof ecPtFmt)) {
         SECStatus rv = ssl3_AppendHandshake(ss, ecPtFmt, (sizeof ecPtFmt));
         if (rv != SECSuccess)
             return -1;
         if (!ss->sec.isServer) {
             TLSExtensionData *xtnData = &ss->xtnData;
             xtnData->advertised[xtnData->numAdvertised++] =
                 ssl_ec_point_formats_xtn;
         }
     }
     return (sizeof ecPtFmt);
 }
 /* Just make sure that the remote client supports uncompressed points,
  * Since that is all we support.  Disable ECC cipher suites if it doesn't.
  */
 SECStatus
 ssl3_HandleSupportedPointFormatsXtn(sslSocket *ss, PRUint16 ex_type,
                                     SECItem *data)
 {
     int i;
     if (data->len < 2 || data->len > 255 || !data->data ||
         data->len != (unsigned int)data->data[0] + 1) {
         /* malformed */
         goto loser;
     }
     for (i = data->len; --i > 0; ) {
         if (data->data[i] == 0) {
             /* indicate that we should send a reply */
             SECStatus rv;
             rv = ssl3_RegisterServerHelloExtensionSender(ss, ex_type,
                               &ssl3_SendSupportedPointFormatsXtn);
             return rv;
         }
     }
 loser:
     /* evil client doesn't support uncompressed */
     ssl3_DisableECCSuites(ss, ecSuites);
     return SECFailure;
 }
 #define SSL3_GET_SERVER_PUBLICKEY(sock, type) \
     (ss->serverCerts[type].serverKeyPair ? \
     ss->serverCerts[type].serverKeyPair->pubKey : NULL)
 /* Extract the TLS curve name for the public key in our EC server cert. */
 ECName ssl3_GetSvrCertCurveName(sslSocket *ss)
 {
     SECKEYPublicKey       *srvPublicKey;
     ECName                ec_curve       = ec_noName;
     srvPublicKey = SSL3_GET_SERVER_PUBLICKEY(ss, kt_ecdh);
     if (srvPublicKey) {
         ec_curve = params2ecName(&srvPublicKey->u.ec.DEREncodedParams);
     }
     return ec_curve;
 }
 /* Ensure that the curve in our server cert is one of the ones suppored
  * by the remote client, and disable all ECC cipher suites if not.
  */
 SECStatus
 ssl3_HandleSupportedCurvesXtn(sslSocket *ss, PRUint16 ex_type, SECItem *data)
 {
     PRInt32  list_len;
     PRUint32 peerCurves   = 0;
     PRUint32 mutualCurves = 0;
     PRUint16 svrCertCurveName;
     if (!data->data || data->len < 4 || data->len > 65535)
         goto loser;
     /* get the length of elliptic_curve_list */
     list_len = ssl3_ConsumeHandshakeNumber(ss, 2, &data->data, &data->len);
     if (list_len < 0 || data->len != list_len || (data->len % 2) != 0) {
         /* malformed */
         goto loser;
     }
     /* build bit vector of peer's supported curve names */
     while (data->len) {
         PRInt32  curve_name =
                  ssl3_ConsumeHandshakeNumber(ss, 2, &data->data, &data->len);
         if (curve_name > ec_noName && curve_name < ec_pastLastName) {
             peerCurves |= (1U << curve_name);
         }
     }
     /* What curves do we support in common? */
     mutualCurves = ss->ssl3.hs.negotiatedECCurves &= peerCurves;
     if (!mutualCurves) { /* no mutually supported EC Curves */
         goto loser;
     }
     /* if our ECC cert doesn't use one of these supported curves,
      * disable ECC cipher suites that require an ECC cert.
      */
     svrCertCurveName = ssl3_GetSvrCertCurveName(ss);
     if (svrCertCurveName != ec_noName &&
         (mutualCurves & (1U << svrCertCurveName)) != 0) {
         return SECSuccess;
     }
     /* Our EC cert doesn't contain a mutually supported curve.
      * Disable all ECC cipher suites that require an EC cert
      */
     ssl3_DisableECCSuites(ss, ecdh_ecdsa_suites);
     ssl3_DisableECCSuites(ss, ecdhe_ecdsa_suites);
     return SECFailure;
 loser:
     /* no common curve supported */
     ssl3_DisableECCSuites(ss, ecSuites);
     return SECFailure;
 }
 #endif /* NSS_DISABLE_ECC */

The Tor Browser / annotate

security/nss/lib/ssl/ssl3ecc.c@b8a032363ba2 (annotated)

security/nss/lib/ssl/ssl3ecc.c