[HTC One X] blubbers:
this is the decoded bct, so yes it should be useable as-is, it is definitifly not encrypted

Version = 0x00030001;
BlockSize = 0x00004000;
PageSize = 0x00000200;
PartitionSize = 0x02000000;
# Bootloader used = 1;
# Bootloaders max = 4;
# BCT size = 6128;
# Hash size = 16;
# Crypto offset = 16;
# Crypto length = 6112;
# Max BCT search blocks = 64;
#
# These values are set by cbootimage using the
# bootloader provided by the Bootloader=...
# configuration option.
#
# Bootloader[0].Version = 0x00000001;
# Bootloader[0].Start block = 384;
# Bootloader[0].Start page = 0;
# Bootloader[0].Length = 2097168;
# Bootloader[0].Load address = 0x80108000;
# Bootloader[0].Entry point = 0x80108000;
# Bootloader[0].Attributes = 0x00000004;

SDRAM[0].MemoryType = NvBootMemoryType_LpDdr2;
SDRAM[0].PllMChargePumpSetupControl = 0x00000008;
SDRAM[0].PllMLoopFilterSetupControl = 0x00000000;
SDRAM[0].PllMInputDivider = 0x0000001a;
SDRAM[0].PllMFeedbackDivider = 0x00000215;
SDRAM[0].PllMPostDivider = 0x00000000;
SDRAM[0].PllMStableTime = 0x0000012c;
SDRAM[0].EmcClockDivider = 0x00000000;
SDRAM[0].EmcAutoCalInterval = 0x001fffff;
SDRAM[0].EmcAutoCalConfig = 0xa0f10000;
SDRAM[0].EmcAutoCalWait = 0x00000064;
SDRAM[0].EmcPinProgramWait = 0x00000000;
SDRAM[0].EmcRc = 0x0000001f;
SDRAM[0].EmcRfc = 0x00000045;
SDRAM[0].EmcRas = 0x00000016;
SDRAM[0].EmcRp = 0x00000009;
SDRAM[0].EmcR2w = 0x00000008;
SDRAM[0].EmcW2r = 0x00000009;
SDRAM[0].EmcR2p = 0x00000003;
SDRAM[0].EmcW2p = 0x0000000d;
SDRAM[0].EmcRrd = 0x00000005;
SDRAM[0].EmcRdRcd = 0x00000009;
SDRAM[0].EmcWrRcd = 0x00000009;
SDRAM[0].EmcRext = 0x00000003;
SDRAM[0].EmcWdv = 0x00000004;
SDRAM[0].EmcQUseExtra = 0x00000000;
SDRAM[0].EmcQUse = 0x00000009;
SDRAM[0].EmcQRst = 0x00000006;
SDRAM[0].EmcQSafe = 0x0000000d;
SDRAM[0].EmcRdv = 0x00000010;
SDRAM[0].EmcRefresh = 0x000007df;
SDRAM[0].EmcBurstRefreshNum = 0x00000000;
SDRAM[0].EmcPdEx2Wr = 0x00000003;
SDRAM[0].EmcPdEx2Rd = 0x00000003;
SDRAM[0].EmcPChg2Pden = 0x00000009;
SDRAM[0].EmcAct2Pden = 0x00000000;
SDRAM[0].EmcAr2Pden = 0x00000001;
SDRAM[0].EmcRw2Pden = 0x0000000f;
SDRAM[0].EmcTxsr = 0x0000004b;
SDRAM[0].EmcTcke = 0x00000008;
SDRAM[0].EmcTfaw = 0x0000001b;
SDRAM[0].EmcTrpab = 0x0000000c;
SDRAM[0].EmcTClkStable = 0x00000004;
SDRAM[0].EmcTClkStop = 0x00000002;
SDRAM[0].EmcTRefBw = 0x000008aa;
SDRAM[0].EmcFbioCfg5 = 0x00006282;
SDRAM[0].EmcFbioCfg6 = 0x00000006;
SDRAM[0].EmcFbioSpare = 0xe0000000;
SDRAM[0].EmcMrsResetDllWait = 0x00000000;
SDRAM[0].EmcMrsResetDll = 0x00000000;
SDRAM[0].EmcMrsDdr2DllReset = 0x00000000;
SDRAM[0].EmcMrs = 0x00000000;
SDRAM[0].EmcEmrsEmr2 = 0x00000000;
SDRAM[0].EmcEmrsEmr3 = 0x00000000;
SDRAM[0].EmcEmrsDdr2DllEnable = 0x00000000;
SDRAM[0].EmcEmrsDdr2OcdCalib = 0x00000000;
SDRAM[0].EmcEmrs = 0x00000000;
SDRAM[0].EmcMrw1 = 0x000100c2;
SDRAM[0].EmcMrw2 = 0x00020006;
SDRAM[0].EmcMrw3 = 0x00030001;
SDRAM[0].EmcMrwResetCommand = 0x003f0000;
SDRAM[0].EmcMrwResetNInitWait = 0x0000000a;
SDRAM[0].EmcAdrCfg = 0x00000001;
SDRAM[0].McEmemCfg = 0x00000400;
SDRAM[0].EmcCfg2 = 0x000c009b;
SDRAM[0].EmcCfgDigDll = 0xf0120091;
SDRAM[0].EmcCfgDigDllPeriod = 0x00008000;
SDRAM[0].EmcCfg = 0xa3e00000;
SDRAM[0].EmcDbg = 0x01000400;
SDRAM[0].WarmBootWait = 0x00000001;
SDRAM[0].EmcCttTermCtrl = 0x00000802;
SDRAM[0].EmcOdtWrite = 0x00000000;
SDRAM[0].EmcOdtRead = 0x00000000;
SDRAM[0].EmcZcalWaitCnt = 0x00000030;
SDRAM[0].EmcZcalMrwCmd = 0x000a0056;
SDRAM[0].EmcDdr2Wait = 0x00000000;
SDRAM[0].PmcDdrPwr = 0x00000003;
SDRAM[0].EmcClockSource = 0x00000000;
SDRAM[0].EmcClockUsePllMUD = 0x00000001;
SDRAM[0].EmcPinExtraWait = 0x00000000;
SDRAM[0].EmcTimingControlWait = 0x00000000;
SDRAM[0].EmcWext = 0x00000000;
SDRAM[0].EmcCtt = 0x00000000;
SDRAM[0].EmcCttDuration = 0x00000000;
SDRAM[0].EmcPreRefreshReqCnt = 0x000001f7;
SDRAM[0].EmcTxsrDll = 0x0000004b;
SDRAM[0].EmcCfgRsv = 0xff00ff88;
SDRAM[0].EmcMrwExtra = 0x000100c2;
SDRAM[0].EmcWarmBootMrw1 = 0x000100c2;
SDRAM[0].EmcWarmBootMrw2 = 0x00020006;
SDRAM[0].EmcWarmBootMrw3 = 0x00030001;
SDRAM[0].EmcWarmBootMrwExtra = 0x00020006;
SDRAM[0].EmcWarmBootExtraModeRegWriteEnable = 0x00000000;
SDRAM[0].EmcExtraModeRegWriteEnable = 0x00000000;
SDRAM[0].EmcMrsWaitCnt = 0x000e000e;
SDRAM[0].EmcCmdQ = 0x10004408;
SDRAM[0].EmcMc2EmcQ = 0x06000404;
SDRAM[0].EmcDynSelfRefControl = 0x800010d9;
SDRAM[0].AhbArbitrationXbarCtrlMemInitDone = 0x00000001;
SDRAM[0].EmcDevSelect = 0x00000000;
SDRAM[0].EmcSelDpdCtrl = 0x0004032c;
SDRAM[0].EmcDllXformDqs0 = 0x0000000a;
SDRAM[0].EmcDllXformDqs1 = 0x0000000a;
SDRAM[0].EmcDllXformDqs2 = 0x0000000a;
SDRAM[0].EmcDllXformDqs3 = 0x0000000a;
SDRAM[0].EmcDllXformDqs4 = 0x0000000a;
SDRAM[0].EmcDllXformDqs5 = 0x0000000a;
SDRAM[0].EmcDllXformDqs6 = 0x0000000a;
SDRAM[0].EmcDllXformDqs7 = 0x0000000a;
SDRAM[0].EmcDllXformQUse0 = 0x00000000;
SDRAM[0].EmcDllXformQUse1 = 0x00000000;
SDRAM[0].EmcDllXformQUse2 = 0x00000000;
SDRAM[0].EmcDllXformQUse3 = 0x00000000;
SDRAM[0].EmcDllXformQUse4 = 0x00000000;
SDRAM[0].EmcDllXformQUse5 = 0x00000000;
SDRAM[0].EmcDllXformQUse6 = 0x00000000;
SDRAM[0].EmcDllXformQUse7 = 0x00000000;
SDRAM[0].EmcDliTrimTxDqs0 = 0x00000000;
SDRAM[0].EmcDliTrimTxDqs1 = 0x00000000;
SDRAM[0].EmcDliTrimTxDqs2 = 0x00000000;
SDRAM[0].EmcDliTrimTxDqs3 = 0x00000000;
SDRAM[0].EmcDliTrimTxDqs4 = 0x00000000;
SDRAM[0].EmcDliTrimTxDqs5 = 0x00000000;
SDRAM[0].EmcDliTrimTxDqs6 = 0x00000000;
SDRAM[0].EmcDliTrimTxDqs7 = 0x00000000;
SDRAM[0].EmcDllXformDq0 = 0x0000000c;
SDRAM[0].EmcDllXformDq1 = 0x0000000c;
SDRAM[0].EmcDllXformDq2 = 0x0000000c;
SDRAM[0].EmcDllXformDq3 = 0x0000000c;
SDRAM[0].EmcZcalInterval = 0x00064000;
SDRAM[0].EmcZcalInitDev0 = 0x800a00ff;
SDRAM[0].EmcZcalInitDev1 = 0x400a00ff;
SDRAM[0].EmcZcalInitWait = 0x00000001;
SDRAM[0].EmcZcalColdBootEnable = 0x00000001;
SDRAM[0].EmcZcalWarmBootEnable = 0x00000001;
SDRAM[0].EmcMrwLpddr2ZcalWarmBoot = 0x000a00ab;
SDRAM[0].EmcZqCalDdr3WarmBoot = 0x00000011;
SDRAM[0].EmcZcalWarmBootWait = 0x00000001;
SDRAM[0].EmcMrsWarmBootEnable = 0x00000001;
SDRAM[0].EmcMrsExtra = 0x00000000;
SDRAM[0].EmcWarmBootMrs = 0x00000000;
SDRAM[0].EmcWarmBootEmrs = 0x00000000;
SDRAM[0].EmcWarmBootEmr2 = 0x00000000;
SDRAM[0].EmcWarmBootEmr3 = 0x00000000;
SDRAM[0].EmcWarmBootMrsExtra = 0x00000000;
SDRAM[0].EmcClkenOverride = 0x00000000;
SDRAM[0].EmcExtraRefreshNum = 0x00000002;
SDRAM[0].EmcClkenOverrideAllWarmBoot = 0x00000000;
SDRAM[0].McClkenOverrideAllWarmBoot = 0x00000000;
SDRAM[0].EmcCfgDigDllPeriodWarmBoot = 0x00000003;
SDRAM[0].PmcVddpSel = 0x00000000;
SDRAM[0].PmcDdrCfg = 0x00000000;
SDRAM[0].PmcIoDpdReq = 0x82a00000;
SDRAM[0].PmcENoVttGen = 0x00000000;
SDRAM[0].PmcNoIoPower = 0x00000000;
SDRAM[0].EmcXm2CmdPadCtrl = 0x00090220;
SDRAM[0].EmcXm2CmdPadCtrl2 = 0x770c0000;
SDRAM[0].EmcXm2DqsPadCtrl = 0x770c1414;
SDRAM[0].EmcXm2DqsPadCtrl2 = 0x0800003d;
SDRAM[0].EmcXm2DqsPadCtrl3 = 0x08000000;
SDRAM[0].EmcXm2DqPadCtrl = 0x770c2990;
SDRAM[0].EmcXm2DqPadCtrl2 = 0x00000000;
SDRAM[0].EmcXm2ClkPadCtrl = 0x77ffc004;
SDRAM[0].EmcXm2CompPadCtrl = 0x01f1f408;
SDRAM[0].EmcXm2VttGenPadCtrl = 0x00000000;
SDRAM[0].EmcXm2VttGenPadCtrl2 = 0x00000007;
SDRAM[0].EmcXm2QUsePadCtrl = 0x08000068;
SDRAM[0].McEmemAdrCfg = 0x00000001;
SDRAM[0].McEmemAdrCfgDev0 = 0x00070303;
SDRAM[0].McEmemAdrCfgDev1 = 0x00070303;
SDRAM[0].McEmemArbCfg = 0x00000008;
SDRAM[0].McEmemArbOutstandingReq = 0x80000060;
SDRAM[0].McEmemArbTimingRcd = 0x00000003;
SDRAM[0].McEmemArbTimingRp = 0x00000004;
SDRAM[0].McEmemArbTimingRc = 0x00000010;
SDRAM[0].McEmemArbTimingRas = 0x0000000a;
SDRAM[0].McEmemArbTimingFaw = 0x0000000d;
SDRAM[0].McEmemArbTimingRrd = 0x00000002;
SDRAM[0].McEmemArbTimingRap2Pre = 0x00000002;
SDRAM[0].McEmemArbTimingWap2Pre = 0x00000008;
SDRAM[0].McEmemArbTimingR2R = 0x00000002;
SDRAM[0].McEmemArbTimingW2W = 0x00000000;
SDRAM[0].McEmemArbTimingR2W = 0x00000004;
SDRAM[0].McEmemArbTimingW2R = 0x00000005;
SDRAM[0].McEmemArbDaTurns = 0x05040002;
SDRAM[0].McEmemArbDaCovers = 0x00110b10;
SDRAM[0].McEmemArbMisc0 = 0x70281811;
SDRAM[0].McEmemArbMisc1 = 0x70000000;
SDRAM[0].McEmemArbRing1Throttle = 0x001f0000;
SDRAM[0].McEmemArbOverride = 0x00000080;
SDRAM[0].McEmemArbRsv = 0xff00ff00;
SDRAM[0].McClkenOverride = 0x00000000;

as for the hboot, i see no reason why an ENG/MFG hboot should give you s-off, it should still check for the s-off flag regardless of it's type.