hdskfini.c

来自「Netscape公司提供的安全套接字层」· C语言 代码 · 共 207 行

/*  *********************************************************************
    File: hdskfini.c

    SSLRef 3.0 Final -- 11/19/96

    Copyright (c)1996 by Netscape Communications Corp.

    By retrieving this software you are bound by the licensing terms
    disclosed in the file "LICENSE.txt". Please read it, and if you don't
    accept the terms, delete this software.

    SSLRef 3.0 was developed by Netscape Communications Corp. of Mountain
    View, California <http://home.netscape.com/> and Consensus Development
    Corporation of Berkeley, California <http://www.consensus.com/>.

    *********************************************************************

    File: hdskfini.c   Finished and server hello done messages

    Support for encoding and decoding finished and server hello done
    messgages. Also includes the necessary calculations for the Finished
    message; note that the same function is used to calculate certificate
    verify message hashes (without the 'SRVR' or 'CLNT' protocol side
    identifier).

    ****************************************************************** */

#ifndef _SSLCTX_H_
#include "sslctx.h"
#endif

#ifndef _SSLHDSHK_H_
#include "sslhdshk.h"
#endif

#ifndef _SSLALLOC_H_
#include "sslalloc.h"
#endif

#include <string.h>

SSLErr
SSLEncodeFinishedMessage(SSLRecord *finished, SSLContext *ctx)
{   SSLErr          err;
    SSLBuffer       finishedMsg, shaMsgState, md5MsgState;
    uint32          sideSenderValue;
    
    shaMsgState.data = 0;
    md5MsgState.data = 0;
    
    finished->contentType = SSL_handshake;
    finished->protocolVersion = SSL_Version_3_0;
    if ((err = SSLAllocBuffer(&finished->contents, 40, &ctx->sysCtx)) != 0)
        return err;
    
    finished->contents.data[0] = SSL_finished;
    SSLEncodeInt(finished->contents.data + 1, 36, 3);
    
    finishedMsg.data = finished->contents.data+4;
    finishedMsg.length = 36;
    
    if ((err = CloneHashState(&SSLHashSHA1, ctx->shaState, &shaMsgState, ctx)) != 0)
        goto fail;
    if ((err = CloneHashState(&SSLHashMD5, ctx->md5State, &md5MsgState, ctx)) != 0)
        goto fail;
    sideSenderValue = (ctx->protocolSide == SSL_ServerSide) ? SSL_Finished_Sender_Server : SSL_Finished_Sender_Client;
    if ((err = SSLCalculateFinishedMessage(finishedMsg, shaMsgState, md5MsgState, sideSenderValue, ctx)) != 0)
        goto fail;  
    
fail:
    SSLFreeBuffer(&shaMsgState, &ctx->sysCtx);
    SSLFreeBuffer(&md5MsgState, &ctx->sysCtx);
    return err;
}

SSLErr
SSLProcessFinished(SSLBuffer message, SSLContext *ctx)
{   SSLErr          err;
    SSLBuffer       expectedFinished, shaMsgState, md5MsgState;
    uint32          peerSenderValue;
    
    if (message.length != 36)
        return SSLProtocolErr;
    
    peerSenderValue = (ctx->protocolSide == SSL_ClientSide) ? SSL_Finished_Sender_Server : SSL_Finished_Sender_Client;
    expectedFinished.data = 0;
    if ((err = SSLAllocBuffer(&expectedFinished, 36, &ctx->sysCtx)) != 0)
        return err;
    shaMsgState.data = 0;
    if ((err = CloneHashState(&SSLHashSHA1, ctx->shaState, &shaMsgState, ctx)) != 0)
        goto fail;
    md5MsgState.data = 0;
    if ((err = CloneHashState(&SSLHashMD5, ctx->md5State, &md5MsgState, ctx)) != 0)
        goto fail;
    if ((err = SSLCalculateFinishedMessage(expectedFinished, shaMsgState, md5MsgState, peerSenderValue, ctx)) != 0)
        goto fail;
    DUMP_BUFFER_NAME("finished got", message);
    DUMP_BUFFER_NAME("finished wanted", expectedFinished);
    if (memcmp(expectedFinished.data, message.data, 36) != 0)
    {   err = SSLProtocolErr;
        goto fail;
    }
    
fail:
    SSLFreeBuffer(&expectedFinished, &ctx->sysCtx);
    SSLFreeBuffer(&shaMsgState, &ctx->sysCtx);
    SSLFreeBuffer(&md5MsgState, &ctx->sysCtx);
    return err;
}

SSLErr
SSLCalculateFinishedMessage(SSLBuffer finished, SSLBuffer shaMsgState,
            SSLBuffer md5MsgState, uint32 senderID, SSLContext *ctx)
{   SSLErr          err;
    SSLBuffer       hash, input;
    uint8           sender[4], md5Inner[16], shaInner[20];
    
    ASSERT(finished.length == 36);
    
    if (senderID != 0)
    {   SSLEncodeInt(sender, senderID, 4);
        input.data = sender;
        input.length = 4;
        if ((err = SSLHashMD5.update(md5MsgState, input)) != 0)
            return err;
        if ((err = SSLHashSHA1.update(shaMsgState, input)) != 0)
            return err;
    }
    input.data = ctx->masterSecret;
    input.length = 48;
    if ((err = SSLHashMD5.update(md5MsgState, input)) != 0)
        return err;
    if ((err = SSLHashSHA1.update(shaMsgState, input)) != 0)
        return err;
    input.data = SSLMACPad1;
    input.length = SSLHashMD5.macPadSize;
    if ((err = SSLHashMD5.update(md5MsgState, input)) != 0)
        return err;
    input.length = SSLHashSHA1.macPadSize;
    if ((err = SSLHashSHA1.update(shaMsgState, input)) != 0)
        return err;
    hash.data = md5Inner;
    hash.length = 16;
    if ((err = SSLHashMD5.final(md5MsgState, hash)) != 0)
        return err;
    hash.data = shaInner;
    hash.length = 20;
    if ((err = SSLHashSHA1.final(shaMsgState, hash)) != 0)
        return err;
    if ((err = SSLHashMD5.init(md5MsgState)) != 0)
        return err;
    if ((err = SSLHashSHA1.init(shaMsgState)) != 0)
        return err;
    input.data = ctx->masterSecret;
    input.length = 48;
    if ((err = SSLHashMD5.update(md5MsgState, input)) != 0)
        return err;
    if ((err = SSLHashSHA1.update(shaMsgState, input)) != 0)
        return err;
    input.data = SSLMACPad2;
    input.length = SSLHashMD5.macPadSize;
    if ((err = SSLHashMD5.update(md5MsgState, input)) != 0)
        return err;
    input.length = SSLHashSHA1.macPadSize;
    if ((err = SSLHashSHA1.update(shaMsgState, input)) != 0)
        return err;
    input.data = md5Inner;
    input.length = 16;
    if ((err = SSLHashMD5.update(md5MsgState, input)) != 0)
        return err;
    hash.data = finished.data;
    hash.length = 16;
    if ((err = SSLHashMD5.final(md5MsgState, hash)) != 0)
        return err;
    input.data = shaInner;
    input.length = 20;
    if ((err = SSLHashSHA1.update(shaMsgState, input)) != 0)
        return err;
    hash.data = finished.data + 16;
    hash.length = 20;
    if ((err = SSLHashSHA1.final(shaMsgState, hash)) != 0)
        return err;
    return SSLNoErr;
}

SSLErr
SSLEncodeServerHelloDone(SSLRecord *helloDone, SSLContext *ctx)
{   SSLErr          err;
    
    helloDone->contentType = SSL_handshake;
    helloDone->protocolVersion = SSL_Version_3_0;
    if ((err = SSLAllocBuffer(&helloDone->contents, 4, &ctx->sysCtx)) != 0)
        return err;
    helloDone->contents.data[0] = SSL_server_hello_done;
    SSLEncodeInt(helloDone->contents.data+1, 0, 3);     /* Message has 0 length */
    return SSLNoErr;
}

SSLErr
SSLProcessServerHelloDone(SSLBuffer message, SSLContext *ctx)
{   ASSERT(ctx->protocolSide == SSL_ClientSide);
    if (message.length != 0)
        return SSLProtocolErr;
    
    return SSLNoErr;
}