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xmss.c
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//
// xmss.c XMSS and XMSS^MT implementation
//
// Copyright (c) Microsoft Corporation. Licensed under the MIT license.
//
#include "precomp.h"
//
// See the symcrypt.h file for documentation on what the various functions do.
//
// Maximum size of the domain separator prefix used in PRFs
#define SYMCRYPT_XMSS_MAX_PREFIX_SIZE SYMCRYPT_HASH_MAX_RESULT_SIZE
// PRF domain separators
#define SYMCRYPT_XMSS_F 0x00
#define SYMCRYPT_XMSS_H 0x01
#define SYMCRYPT_XMSS_H_MSG 0x02
#define SYMCRYPT_XMSS_PRF 0x03
#define SYMCRYPT_XMSS_PRF_KEYGEN 0x04
static const PCSYMCRYPT_HASH* XmssHashArray[] = {
&SymCryptSha256Algorithm, // 0
&SymCryptSha512Algorithm, // 1
&SymCryptShake128HashAlgorithm, // 2
&SymCryptShake256HashAlgorithm, // 3
};
typedef enum _SYMCRYPT_XMSS_WOTSP_ALGID
{
// Hash Fn. RFC-8391 SP800-208
SYMCRYPT_XMSS_WOTSP_SHA2_256 = 0x00000001, // SHA-256 X X
SYMCRYPT_XMSS_WOTSP_SHA2_512 = 0x00000002, // SHA-512 X
SYMCRYPT_XMSS_WOTSP_SHAKE_256 = 0x00000003, // SHAKE128 X
SYMCRYPT_XMSS_WOTSP_SHAKE_512 = 0x00000004, // SHAKE256 X
SYMCRYPT_XMSS_WOTSP_SHA2_192 = 0x00000005, // SHA-256 X
SYMCRYPT_XMSS_WOTSP_SHAKE256_256 = 0x00000006, // SHAKE256 X
SYMCRYPT_XMSS_WOTSP_SHAKE256_192 = 0x00000007, // SHAKE256 X
} SYMCRYPT_XMSS_WOTSP_ALGID, *PSYMCRYPT_XMSS_WOTSP_ALGID;
typedef struct _SYMCRYPT_XMSS_WOTSP_PARAMS
{
SYMCRYPT_XMSS_WOTSP_ALGID wotspId;
UINT8 hashIndex;
UINT8 n;
UINT8 w;
UINT8 cbPrefix;
} SYMCRYPT_XMSS_WOTSP_PARAMS, *PSYMCRYPT_XMSS_WOTSP_PARAMS;
static const SYMCRYPT_XMSS_WOTSP_PARAMS XmssWotspParams[] =
{
// wotspId hashIndex n w cbPrefix
{ SYMCRYPT_XMSS_WOTSP_SHA2_256, 0, 32, 4, 32 }, // SHA-256
{ SYMCRYPT_XMSS_WOTSP_SHA2_512, 1, 64, 4, 64 }, // SHA-512
{ SYMCRYPT_XMSS_WOTSP_SHAKE_256, 2, 32, 4, 32 }, // SHAKE128
{ SYMCRYPT_XMSS_WOTSP_SHAKE_512, 3, 64, 4, 64 }, // SHAKE256
{ SYMCRYPT_XMSS_WOTSP_SHA2_192, 0, 24, 4, 4 }, // SHA-256
{ SYMCRYPT_XMSS_WOTSP_SHAKE256_256, 3, 32, 4, 32 }, // SHAKE256
{ SYMCRYPT_XMSS_WOTSP_SHAKE256_192, 3, 24, 4, 4 }, // SHAKE256
};
typedef struct _SYMCRYPT_XMSS_PARAMETER_PREDEFINED
{
UINT32 idAlg;
SYMCRYPT_XMSS_WOTSP_ALGID idWotsp;
// total tree height (each level has height h/d)
UINT8 h;
// number of layers (for single tree, d=1)
UINT8 d;
} SYMCRYPT_XMSS_PARAMETER_PREDEFINED;
typedef SYMCRYPT_XMSS_PARAMETER_PREDEFINED* PSYMCRYPT_XMSS_PARAMETER_PREDEFINED;
typedef const SYMCRYPT_XMSS_PARAMETER_PREDEFINED* PCSYMCRYPT_XMSS_PARAMETER_PREDEFINED;
static const SYMCRYPT_XMSS_PARAMETER_PREDEFINED XmssParametersPredefined[] = {
// algId wotspId/wotspIndex h d
{ SYMCRYPT_XMSS_SHA2_10_256, SYMCRYPT_XMSS_WOTSP_SHA2_256, 10, 1 },
{ SYMCRYPT_XMSS_SHA2_16_256, SYMCRYPT_XMSS_WOTSP_SHA2_256, 16, 1 },
{ SYMCRYPT_XMSS_SHA2_20_256, SYMCRYPT_XMSS_WOTSP_SHA2_256, 20, 1 },
{ SYMCRYPT_XMSS_SHA2_10_512, SYMCRYPT_XMSS_WOTSP_SHA2_512, 10, 1 },
{ SYMCRYPT_XMSS_SHA2_16_512, SYMCRYPT_XMSS_WOTSP_SHA2_512, 16, 1 },
{ SYMCRYPT_XMSS_SHA2_20_512, SYMCRYPT_XMSS_WOTSP_SHA2_512, 20, 1 },
{ SYMCRYPT_XMSS_SHAKE_10_256, SYMCRYPT_XMSS_WOTSP_SHAKE_256, 10, 1 },
{ SYMCRYPT_XMSS_SHAKE_16_256, SYMCRYPT_XMSS_WOTSP_SHAKE_256, 16, 1 },
{ SYMCRYPT_XMSS_SHAKE_20_256, SYMCRYPT_XMSS_WOTSP_SHAKE_256, 20, 1 },
{ SYMCRYPT_XMSS_SHAKE_10_512, SYMCRYPT_XMSS_WOTSP_SHAKE_512, 10, 1 },
{ SYMCRYPT_XMSS_SHAKE_16_512, SYMCRYPT_XMSS_WOTSP_SHAKE_512, 16, 1 },
{ SYMCRYPT_XMSS_SHAKE_20_512, SYMCRYPT_XMSS_WOTSP_SHAKE_512, 20, 1 },
{ SYMCRYPT_XMSS_SHA2_10_192, SYMCRYPT_XMSS_WOTSP_SHA2_192, 10, 1 },
{ SYMCRYPT_XMSS_SHA2_16_192, SYMCRYPT_XMSS_WOTSP_SHA2_192, 16, 1 },
{ SYMCRYPT_XMSS_SHA2_20_192, SYMCRYPT_XMSS_WOTSP_SHA2_192, 20, 1 },
{ SYMCRYPT_XMSS_SHAKE256_10_256, SYMCRYPT_XMSS_WOTSP_SHAKE256_256, 10, 1 },
{ SYMCRYPT_XMSS_SHAKE256_16_256, SYMCRYPT_XMSS_WOTSP_SHAKE256_256, 16, 1 },
{ SYMCRYPT_XMSS_SHAKE256_20_256, SYMCRYPT_XMSS_WOTSP_SHAKE256_256, 20, 1 },
{ SYMCRYPT_XMSS_SHAKE256_10_192, SYMCRYPT_XMSS_WOTSP_SHAKE256_192, 10, 1 },
{ SYMCRYPT_XMSS_SHAKE256_16_192, SYMCRYPT_XMSS_WOTSP_SHAKE256_192, 16, 1 },
{ SYMCRYPT_XMSS_SHAKE256_20_192, SYMCRYPT_XMSS_WOTSP_SHAKE256_192, 20, 1 },
};
static const SYMCRYPT_XMSS_PARAMETER_PREDEFINED XmssMtParametersPredefined[] = {
// algId wotspId/wotspIndex h d
{ SYMCRYPT_XMSSMT_SHA2_20_2_256, SYMCRYPT_XMSS_WOTSP_SHA2_256, 20, 2 },
{ SYMCRYPT_XMSSMT_SHA2_20_4_256, SYMCRYPT_XMSS_WOTSP_SHA2_256, 20, 4 },
{ SYMCRYPT_XMSSMT_SHA2_40_2_256, SYMCRYPT_XMSS_WOTSP_SHA2_256, 40, 2 },
{ SYMCRYPT_XMSSMT_SHA2_40_4_256, SYMCRYPT_XMSS_WOTSP_SHA2_256, 40, 4 },
{ SYMCRYPT_XMSSMT_SHA2_40_8_256, SYMCRYPT_XMSS_WOTSP_SHA2_256, 40, 8 },
{ SYMCRYPT_XMSSMT_SHA2_60_3_256, SYMCRYPT_XMSS_WOTSP_SHA2_256, 60, 3 },
{ SYMCRYPT_XMSSMT_SHA2_60_6_256, SYMCRYPT_XMSS_WOTSP_SHA2_256, 60, 6 },
{ SYMCRYPT_XMSSMT_SHA2_60_12_256, SYMCRYPT_XMSS_WOTSP_SHA2_256, 60, 12 },
{ SYMCRYPT_XMSSMT_SHA2_20_2_512, SYMCRYPT_XMSS_WOTSP_SHA2_512, 20, 2 },
{ SYMCRYPT_XMSSMT_SHA2_20_4_512, SYMCRYPT_XMSS_WOTSP_SHA2_512, 20, 4 },
{ SYMCRYPT_XMSSMT_SHA2_40_2_512, SYMCRYPT_XMSS_WOTSP_SHA2_512, 40, 2 },
{ SYMCRYPT_XMSSMT_SHA2_40_4_512, SYMCRYPT_XMSS_WOTSP_SHA2_512, 40, 4 },
{ SYMCRYPT_XMSSMT_SHA2_40_8_512, SYMCRYPT_XMSS_WOTSP_SHA2_512, 40, 8 },
{ SYMCRYPT_XMSSMT_SHA2_60_3_512, SYMCRYPT_XMSS_WOTSP_SHA2_512, 60, 3 },
{ SYMCRYPT_XMSSMT_SHA2_60_6_512, SYMCRYPT_XMSS_WOTSP_SHA2_512, 60, 6 },
{ SYMCRYPT_XMSSMT_SHA2_60_12_512, SYMCRYPT_XMSS_WOTSP_SHA2_512, 60, 12 },
{ SYMCRYPT_XMSSMT_SHAKE_20_2_256, SYMCRYPT_XMSS_WOTSP_SHAKE_256, 20, 2 },
{ SYMCRYPT_XMSSMT_SHAKE_20_4_256, SYMCRYPT_XMSS_WOTSP_SHAKE_256, 20, 4 },
{ SYMCRYPT_XMSSMT_SHAKE_40_2_256, SYMCRYPT_XMSS_WOTSP_SHAKE_256, 40, 2 },
{ SYMCRYPT_XMSSMT_SHAKE_40_4_256, SYMCRYPT_XMSS_WOTSP_SHAKE_256, 40, 4 },
{ SYMCRYPT_XMSSMT_SHAKE_40_8_256, SYMCRYPT_XMSS_WOTSP_SHAKE_256, 40, 8 },
{ SYMCRYPT_XMSSMT_SHAKE_60_3_256, SYMCRYPT_XMSS_WOTSP_SHAKE_256, 60, 3 },
{ SYMCRYPT_XMSSMT_SHAKE_60_6_256, SYMCRYPT_XMSS_WOTSP_SHAKE_256, 60, 6 },
{ SYMCRYPT_XMSSMT_SHAKE_60_12_256, SYMCRYPT_XMSS_WOTSP_SHAKE_256, 60, 12 },
{ SYMCRYPT_XMSSMT_SHAKE_20_2_512, SYMCRYPT_XMSS_WOTSP_SHAKE_512, 20, 2 },
{ SYMCRYPT_XMSSMT_SHAKE_20_4_512, SYMCRYPT_XMSS_WOTSP_SHAKE_512, 20, 4 },
{ SYMCRYPT_XMSSMT_SHAKE_40_2_512, SYMCRYPT_XMSS_WOTSP_SHAKE_512, 40, 2 },
{ SYMCRYPT_XMSSMT_SHAKE_40_4_512, SYMCRYPT_XMSS_WOTSP_SHAKE_512, 40, 4 },
{ SYMCRYPT_XMSSMT_SHAKE_40_8_512, SYMCRYPT_XMSS_WOTSP_SHAKE_512, 40, 8 },
{ SYMCRYPT_XMSSMT_SHAKE_60_3_512, SYMCRYPT_XMSS_WOTSP_SHAKE_512, 60, 3 },
{ SYMCRYPT_XMSSMT_SHAKE_60_6_512, SYMCRYPT_XMSS_WOTSP_SHAKE_512, 60, 6 },
{ SYMCRYPT_XMSSMT_SHAKE_60_12_512, SYMCRYPT_XMSS_WOTSP_SHAKE_512, 60, 12 },
{ SYMCRYPT_XMSSMT_SHA2_20_2_192, SYMCRYPT_XMSS_WOTSP_SHA2_192, 20, 2 },
{ SYMCRYPT_XMSSMT_SHA2_20_4_192, SYMCRYPT_XMSS_WOTSP_SHA2_192, 20, 4 },
{ SYMCRYPT_XMSSMT_SHA2_40_2_192, SYMCRYPT_XMSS_WOTSP_SHA2_192, 40, 2 },
{ SYMCRYPT_XMSSMT_SHA2_40_4_192, SYMCRYPT_XMSS_WOTSP_SHA2_192, 40, 4 },
{ SYMCRYPT_XMSSMT_SHA2_40_8_192, SYMCRYPT_XMSS_WOTSP_SHA2_192, 40, 8 },
{ SYMCRYPT_XMSSMT_SHA2_60_3_192, SYMCRYPT_XMSS_WOTSP_SHA2_192, 60, 3 },
{ SYMCRYPT_XMSSMT_SHA2_60_6_192, SYMCRYPT_XMSS_WOTSP_SHA2_192, 60, 6 },
{ SYMCRYPT_XMSSMT_SHA2_60_12_192, SYMCRYPT_XMSS_WOTSP_SHA2_192, 60, 12 },
{ SYMCRYPT_XMSSMT_SHAKE256_20_2_256, SYMCRYPT_XMSS_WOTSP_SHAKE256_256, 20, 2 },
{ SYMCRYPT_XMSSMT_SHAKE256_20_4_256, SYMCRYPT_XMSS_WOTSP_SHAKE256_256, 20, 4 },
{ SYMCRYPT_XMSSMT_SHAKE256_40_2_256, SYMCRYPT_XMSS_WOTSP_SHAKE256_256, 40, 2 },
{ SYMCRYPT_XMSSMT_SHAKE256_40_4_256, SYMCRYPT_XMSS_WOTSP_SHAKE256_256, 40, 4 },
{ SYMCRYPT_XMSSMT_SHAKE256_40_8_256, SYMCRYPT_XMSS_WOTSP_SHAKE256_256, 40, 8 },
{ SYMCRYPT_XMSSMT_SHAKE256_60_3_256, SYMCRYPT_XMSS_WOTSP_SHAKE256_256, 60, 3 },
{ SYMCRYPT_XMSSMT_SHAKE256_60_6_256, SYMCRYPT_XMSS_WOTSP_SHAKE256_256, 60, 6 },
{ SYMCRYPT_XMSSMT_SHAKE256_60_12_256, SYMCRYPT_XMSS_WOTSP_SHAKE256_256, 60, 12 },
{ SYMCRYPT_XMSSMT_SHAKE256_20_2_192, SYMCRYPT_XMSS_WOTSP_SHAKE256_192, 20, 2 },
{ SYMCRYPT_XMSSMT_SHAKE256_20_4_192, SYMCRYPT_XMSS_WOTSP_SHAKE256_192, 20, 4 },
{ SYMCRYPT_XMSSMT_SHAKE256_40_2_192, SYMCRYPT_XMSS_WOTSP_SHAKE256_192, 40, 2 },
{ SYMCRYPT_XMSSMT_SHAKE256_40_4_192, SYMCRYPT_XMSS_WOTSP_SHAKE256_192, 40, 4 },
{ SYMCRYPT_XMSSMT_SHAKE256_40_8_192, SYMCRYPT_XMSS_WOTSP_SHAKE256_192, 40, 8 },
{ SYMCRYPT_XMSSMT_SHAKE256_60_3_192, SYMCRYPT_XMSS_WOTSP_SHAKE256_192, 60, 3 },
{ SYMCRYPT_XMSSMT_SHAKE256_60_6_192, SYMCRYPT_XMSS_WOTSP_SHAKE256_192, 60, 6 },
{ SYMCRYPT_XMSSMT_SHAKE256_60_12_192, SYMCRYPT_XMSS_WOTSP_SHAKE256_192, 60, 12 },
};
//
// Compute the number of chains for an n-byte input and its checksum
// for Winternitz parameter w (i.e., using w-bit blocks) in an OTS scheme
//
VOID
SYMCRYPT_CALL
SymCryptHbsGetWinternitzLengths(
UINT32 n,
UINT32 w,
_Out_ PUINT32 puLen1,
_Out_ PUINT32 puLen2
)
{
UINT32 len1;
UINT32 len2;
UINT32 maxChecksum;
ULONG msb;
SYMCRYPT_ASSERT(n > 0);
SYMCRYPT_ASSERT(w >= 1 && w <= 8);
// number of w-bit digits in an n-byte input
len1 = (8 * n + (w - 1)) / w;
// maximum value the checksum can take (each w-bit digit can have value at most 2^w-1)
maxChecksum = len1 * ((1 << w) - 1);
msb = 31 - SymCryptCountLeadingZeros32(maxChecksum);
// msb + 1 bits are required to store the maxChecksum,
// calculate the number of w-bit blocks to represent that
len2 = (msb + 1 + (w - 1)) / w;
*puLen1 = len1;
*puLen2 = len2;
}
SYMCRYPT_ERROR
SYMCRYPT_CALL
SymCryptXmssGetWotspParams(
SYMCRYPT_XMSS_WOTSP_ALGID id,
_Out_ PSYMCRYPT_XMSS_PARAMS pParams )
{
SYMCRYPT_ERROR scError = SYMCRYPT_NO_ERROR;
for (UINT32 i = 0; i < SYMCRYPT_ARRAY_SIZE(XmssWotspParams); i++)
{
if (XmssWotspParams[i].wotspId == id)
{
SYMCRYPT_ASSERT(XmssWotspParams[i].hashIndex < SYMCRYPT_ARRAY_SIZE(XmssHashArray));
pParams->hash = *XmssHashArray[XmssWotspParams[i].hashIndex];
pParams->cbHashOutput = XmssWotspParams[i].n;
pParams->nWinternitzWidth = XmssWotspParams[i].w;
pParams->cbPrefix = XmssWotspParams[i].cbPrefix;
goto cleanup;
}
}
scError = SYMCRYPT_INVALID_ARGUMENT;
cleanup:
return scError;
}
//
// Derive XMSS parameters that can be computed from others
//
// SYMCRYPT_XMSS_PARAMS structure must be initialized with either predefined
// or user defined parameters before this function is called.
//
VOID
SYMCRYPT_CALL
SymCryptXmssDeriveParams(
_Inout_ PSYMCRYPT_XMSS_PARAMS pParams )
{
SymCryptHbsGetWinternitzLengths(
pParams->cbHashOutput,
pParams->nWinternitzWidth,
&pParams->len1,
&pParams->len2);
pParams->len = pParams->len1 + pParams->len2;
UINT32 nChecksumBits = pParams->len2 * pParams->nWinternitzWidth;
SYMCRYPT_ASSERT(nChecksumBits <= 32);
pParams->nLeftShift32 = (UINT8)(32 - nChecksumBits);
if (pParams->nLayers == 1)
{
// single trees have a 32-bit Idx value
pParams->cbIdx = 4;
}
else
{
// number of bytes to store h-bits for Idx
pParams->cbIdx = (pParams->nTotalTreeHeight + 7) / 8;
}
pParams->nLayerHeight = pParams->nTotalTreeHeight / pParams->nLayers;
}
//
// Fill a SYMCRYPT_XMSS_PARAMS structure from either an XMSS algorithm ID or
// XMSS^MT algorithm ID from predefined parameter sets.
//
SYMCRYPT_ERROR
SYMCRYPT_CALL
SymCryptXmssParamsFromAlgIdCommon(
UINT32 id,
BOOLEAN isMultiTree,
_Out_ PSYMCRYPT_XMSS_PARAMS pParams )
{
SYMCRYPT_ERROR scError = SYMCRYPT_INVALID_ARGUMENT;
PCSYMCRYPT_XMSS_PARAMETER_PREDEFINED pParameters = NULL;
SIZE_T uParameterCount;
SymCryptWipeKnownSize(pParams, sizeof(*pParams));
if (isMultiTree)
{
pParameters = XmssMtParametersPredefined;
uParameterCount = SYMCRYPT_ARRAY_SIZE(XmssMtParametersPredefined);
}
else
{
pParameters = XmssParametersPredefined;
uParameterCount = SYMCRYPT_ARRAY_SIZE(XmssParametersPredefined);
}
for (UINT32 i = 0; i < uParameterCount; i++)
{
if (pParameters[i].idAlg == id)
{
scError = SymCryptXmssGetWotspParams(pParameters[i].idWotsp, pParams);
if (scError == SYMCRYPT_NO_ERROR)
{
SYMCRYPT_ASSERT(pParams->cbHashOutput <= SYMCRYPT_HASH_MAX_RESULT_SIZE);
pParams->id = id;
pParams->nTotalTreeHeight = pParameters[i].h;
pParams->nLayers = pParameters[i].d;
SymCryptXmssDeriveParams(pParams);
}
break;
}
}
return scError;
}
SYMCRYPT_ERROR
SYMCRYPT_CALL
SymCryptXmssParamsFromAlgId(
SYMCRYPT_XMSS_ALGID id,
_Out_ PSYMCRYPT_XMSS_PARAMS pParams )
{
return SymCryptXmssParamsFromAlgIdCommon(id, FALSE, pParams);
}
SYMCRYPT_ERROR
SYMCRYPT_CALL
SymCryptXmssMtParamsFromAlgId(
SYMCRYPT_XMSSMT_ALGID id,
_Out_ PSYMCRYPT_XMSS_PARAMS pParams)
{
return SymCryptXmssParamsFromAlgIdCommon(id, TRUE, pParams);
}
//
// Set custom XMSS/XMSS^MT parameters
//
// This function can be used to initialize SYMCRYPT_XMSS_PARAMS with
// custom parameters that are not defined by the standards.
//
SYMCRYPT_ERROR
SYMCRYPT_CALL
SymCryptXmssSetParams(
_Out_ PSYMCRYPT_XMSS_PARAMS pParams,
UINT32 id,
_In_ PCSYMCRYPT_HASH pHash, // hash algorithm
UINT32 cbHashOutput, // hash output size
UINT32 nWinternitzWidth, // Winternitz parameter
UINT32 nTotalTreeHeight, // total tree height
UINT32 nLayers, // number of layers
UINT32 cbPrefix // domain separater prefix length
)
{
SYMCRYPT_ERROR scError = SYMCRYPT_NO_ERROR;
if (pParams == NULL)
{
scError = SYMCRYPT_INVALID_ARGUMENT;
goto cleanup;
}
SymCryptWipeKnownSize(pParams, sizeof(*pParams));
if (pHash == NULL)
{
scError = SYMCRYPT_INVALID_ARGUMENT;
goto cleanup;
}
// Output size n can at most be equal to the hash output size
if (cbHashOutput == 0 ||
cbHashOutput > pHash->resultSize ||
cbHashOutput > SYMCRYPT_HASH_MAX_RESULT_SIZE)
{
scError = SYMCRYPT_INVALID_ARGUMENT;
goto cleanup;
}
// Winternitz parameter must be one of 1, 2, 4, or 8
if (nWinternitzWidth == 0 ||
nWinternitzWidth > 8 ||
(nWinternitzWidth & (nWinternitzWidth - 1)) != 0)
{
scError = SYMCRYPT_INVALID_ARGUMENT;
goto cleanup;
}
// nTotalTreeHeight and nLayers must both be positive and
// nLayers must divide nTotalTreeHeight
if (nTotalTreeHeight == 0 ||
nLayers == 0 ||
(nTotalTreeHeight % nLayers) != 0)
{
scError = SYMCRYPT_INVALID_ARGUMENT;
goto cleanup;
}
// Layer height (tree height of one layer) can be at most 32
if ((nTotalTreeHeight / nLayers) > 32)
{
scError = SYMCRYPT_INVALID_ARGUMENT;
goto cleanup;
}
// Total tree height can be at most 63
if (nTotalTreeHeight > 63)
{
scError = SYMCRYPT_INVALID_ARGUMENT;
goto cleanup;
}
if (cbPrefix == 0)
{
scError = SYMCRYPT_INVALID_ARGUMENT;
goto cleanup;
}
pParams->id = id;
pParams->hash = pHash;
pParams->cbHashOutput = cbHashOutput;
pParams->nWinternitzWidth = nWinternitzWidth;
pParams->nTotalTreeHeight = nTotalTreeHeight;
pParams->nLayers = nLayers;
SymCryptXmssDeriveParams(pParams);
pParams->cbPrefix = cbPrefix;
cleanup:
return scError;
}
//
// Updates the type field in ADRS structure and clears the
// subsequent fields.
//
// Does not modify the first two fields (Layer and Tree) of
// the ADRS structure.
//
VOID
SYMCRYPT_CALL
SymCryptXmssSetAdrsType(
_Out_ PXMSS_ADRS adrs,
UINT32 type )
{
SYMCRYPT_STORE_MSBFIRST32(adrs->en32Type, type);
SymCryptWipeKnownSize(&adrs->u, sizeof(adrs->u));
SYMCRYPT_STORE_MSBFIRST32(adrs->en32KeyAndMask, 0);
}
SIZE_T
SYMCRYPT_CALL
SymCryptXmssSizeofSignatureFromParams(
_In_ PCSYMCRYPT_XMSS_PARAMS pParams )
{
SYMCRYPT_ASSERT(pParams->nLayers != 0);
SYMCRYPT_ASSERT((pParams->nTotalTreeHeight % pParams->nLayers) == 0);
SYMCRYPT_ASSERT(pParams->nLayerHeight > 0);
SIZE_T size = 0;
size += pParams->cbIdx; // idx
size += pParams->cbHashOutput; // randomness
// WOTSP signature + authentication path for each layer
size += pParams->nLayers * ( pParams->cbHashOutput * (pParams->len + pParams->nLayerHeight) );
return size;
}
SYMCRYPT_ERROR
SYMCRYPT_CALL
SymCryptXmssSizeofKeyBlobFromParams(
_In_ PCSYMCRYPT_XMSS_PARAMS pParams,
SYMCRYPT_XMSSKEY_TYPE keyType,
_Out_ SIZE_T* pcbKey )
{
SYMCRYPT_ERROR scError = SYMCRYPT_NO_ERROR;
SIZE_T cbPublicKey = 0;
SIZE_T cbPrivateKey = 0;
// Public Key
cbPublicKey += sizeof(UINT32); // Alg ID
cbPublicKey += 2 * pParams->cbHashOutput; // Root and Seed
// Private Key (on top of the public key)
cbPrivateKey = cbPublicKey;
cbPrivateKey += sizeof(UINT64); // Idx
cbPrivateKey += 2 * pParams->cbHashOutput; // SK_XMSS and SK_PRF
switch (keyType)
{
case SYMCRYPT_XMSSKEY_TYPE_PUBLIC:
*pcbKey = cbPublicKey;
break;
case SYMCRYPT_XMSSKEY_TYPE_PRIVATE:
*pcbKey = cbPrivateKey;
break;
default:
scError = SYMCRYPT_INVALID_ARGUMENT;
break;
}
return scError;
}
PSYMCRYPT_XMSS_KEY
SYMCRYPT_CALL
SymCryptXmsskeyAllocate(
_In_ PCSYMCRYPT_XMSS_PARAMS pParams,
UINT32 flags )
{
PSYMCRYPT_XMSS_KEY pKey = NULL;
// No flags allowed
if (flags != 0)
{
goto cleanup;
}
SIZE_T cbSize = sizeof(SYMCRYPT_XMSS_KEY);
pKey = SymCryptCallbackAlloc(cbSize);
if (pKey == NULL)
{
goto cleanup;
}
SymCryptWipe(pKey, cbSize);
pKey->version = 1;
pKey->keyType = SYMCRYPT_XMSSKEY_TYPE_NONE;
pKey->params = *pParams;
SYMCRYPT_SET_MAGIC(pKey);
cleanup:
return pKey;
}
VOID
SYMCRYPT_CALL
SymCryptXmsskeyFree(
_Inout_ PSYMCRYPT_XMSS_KEY pKey )
{
SYMCRYPT_CHECK_MAGIC(pKey);
SymCryptWipeKnownSize(pKey, sizeof(*pKey));
SymCryptCallbackFree(pKey);
}
PSYMCRYPT_INCREMENTAL_TREEHASH
SYMCRYPT_CALL
SymCryptHbsIncrementalTreehashInit(
UINT32 nLeaves,
PBYTE pbBuffer,
SIZE_T cbBuffer,
UINT32 cbHashResult,
PSYMCRYPT_INCREMENTAL_TREEHASH_FUNC funcCompressNodes,
PSYMCRYPT_XMSS_INCREMENTAL_TREEHASH_CONTEXT pContext )
{
UNREFERENCED_PARAMETER(cbBuffer);
SYMCRYPT_ASSERT(cbBuffer >= SymCryptHbsSizeofScratchBytesForIncrementalTreehash(cbHashResult, nLeaves));
PSYMCRYPT_INCREMENTAL_TREEHASH pIncHash = (PSYMCRYPT_INCREMENTAL_TREEHASH)pbBuffer;
pIncHash->cbNode = 2 * sizeof(UINT32) + cbHashResult;
pIncHash->nSize = 0;
pIncHash->nCapacity = SymCryptHbsIncrementalTreehashStackDepth(nLeaves);
pIncHash->nLastLeafIndex = 0;
pIncHash->funcCompressNodes = funcCompressNodes;
pIncHash->pContext = pContext;
return pIncHash;
}
PSYMCRYPT_TREEHASH_NODE
SYMCRYPT_CALL
SymCryptHbsIncrementalTreehashGetNode(
_In_ PSYMCRYPT_INCREMENTAL_TREEHASH pIncHash,
SIZE_T index )
{
PBYTE pNode = (PBYTE)pIncHash->arrNodes;
pNode += index * pIncHash->cbNode;
return (PSYMCRYPT_TREEHASH_NODE)pNode;
}
PSYMCRYPT_TREEHASH_NODE
SYMCRYPT_CALL
SymCryptHbsIncrementalTreehashAllocNode(
_Inout_ PSYMCRYPT_INCREMENTAL_TREEHASH pIncHash,
UINT32 nLeafIndex )
{
SYMCRYPT_ASSERT(pIncHash->nSize < pIncHash->nCapacity);
PSYMCRYPT_TREEHASH_NODE pNode = SymCryptHbsIncrementalTreehashGetNode(pIncHash, pIncHash->nSize);
pNode->height = 0;
pNode->index = nLeafIndex;
pIncHash->nSize++;
return pNode;
}
VOID
SYMCRYPT_CALL
SymCryptHbsIncrementalTreehashGetTopNodes(
_Inout_ PSYMCRYPT_INCREMENTAL_TREEHASH pIncHash,
_Out_ PSYMCRYPT_TREEHASH_NODE *ppNodeLeft,
_Out_ PSYMCRYPT_TREEHASH_NODE *ppNodeRight )
{
*ppNodeRight = (pIncHash->nSize < 1) ? NULL : SymCryptHbsIncrementalTreehashGetNode(pIncHash, pIncHash->nSize - 1);
*ppNodeLeft = (pIncHash->nSize < 2) ? NULL : SymCryptHbsIncrementalTreehashGetNode(pIncHash, pIncHash->nSize - 2);
}
PSYMCRYPT_TREEHASH_NODE
SYMCRYPT_CALL
SymCryptHbsIncrementalTreehashProcessCommon(
_Inout_ PSYMCRYPT_INCREMENTAL_TREEHASH pIncHash,
BOOLEAN fFinal )
{
PSYMCRYPT_TREEHASH_NODE pNodeLeft = NULL;
PSYMCRYPT_TREEHASH_NODE pNodeRight = NULL;
SYMCRYPT_ASSERT(pIncHash->nSize > 0);
SymCryptHbsIncrementalTreehashGetTopNodes(pIncHash, &pNodeLeft, &pNodeRight);
while ( pNodeLeft &&
(fFinal || (pNodeLeft->height == pNodeRight->height)) )
{
pIncHash->funcCompressNodes(
pNodeLeft,
pNodeRight,
pNodeLeft,
pIncHash->pContext);
pIncHash->nSize--;
SymCryptHbsIncrementalTreehashGetTopNodes(pIncHash, &pNodeLeft, &pNodeRight);
}
return pNodeRight;
}
PSYMCRYPT_TREEHASH_NODE
SYMCRYPT_CALL
SymCryptHbsIncrementalTreehashProcess(
_Inout_ PSYMCRYPT_INCREMENTAL_TREEHASH pIncHash)
{
return SymCryptHbsIncrementalTreehashProcessCommon(pIncHash, FALSE);
}
PSYMCRYPT_TREEHASH_NODE
SYMCRYPT_CALL
SymCryptHbsIncrementalTreehashFinalize(
_Inout_ PSYMCRYPT_INCREMENTAL_TREEHASH pIncHash )
{
return SymCryptHbsIncrementalTreehashProcessCommon(pIncHash, TRUE);
}
UINT32
SYMCRYPT_CALL
SymCryptHbsIncrementalTreehashStackDepth(
UINT32 nLeaves)
{
ULONG h;
// Minimum height binary tree that contains nLeaves many leaves is h+1
h = 31 - SymCryptCountLeadingZeros32(nLeaves);
// Tree root computation will require a stack of depth equal to tree height plus 1
return (h + 2);
}
SIZE_T
SYMCRYPT_CALL
SymCryptHbsSizeofScratchBytesForIncrementalTreehash(
UINT32 cbNode,
UINT32 nLeaves)
{
SIZE_T nodeSize = (cbNode + 2 * sizeof(UINT32)) + sizeof(SYMCRYPT_INCREMENTAL_TREEHASH);
return nodeSize * SymCryptHbsIncrementalTreehashStackDepth(nLeaves);
}
VOID
SYMCRYPT_CALL
SymCryptXmssPrfInit(
_In_ PCSYMCRYPT_HASH hash,
BYTE PrfType,
SIZE_T prefixLength,
_Out_ PSYMCRYPT_HASH_STATE state )
{
BYTE prefix[SYMCRYPT_XMSS_MAX_PREFIX_SIZE];
SYMCRYPT_ASSERT(prefixLength <= SYMCRYPT_XMSS_MAX_PREFIX_SIZE);
SymCryptWipe(prefix, prefixLength);
prefix[prefixLength - 1] = PrfType;
SymCryptHashInit(hash, state);
SymCryptHashAppend(hash, state, prefix, prefixLength);
}
VOID
SYMCRYPT_CALL
SymCryptXmssPrfKey(
_In_ PCSYMCRYPT_XMSS_PARAMS pParams,
_In_reads_bytes_( cbKey ) PCBYTE pbKey,
SIZE_T cbKey,
_Out_ SYMCRYPT_HASH_STATE *pState )
{
SymCryptXmssPrfInit(pParams->hash, SYMCRYPT_XMSS_PRF, pParams->cbPrefix, pState);
SymCryptHashAppend(pParams->hash, pState, pbKey, cbKey);
}
VOID
SYMCRYPT_CALL
SymCryptXmssPrf(
_In_ PCSYMCRYPT_XMSS_PARAMS pParams,
BYTE PrfType,
_In_reads_bytes_( cbKey ) PCBYTE pbKey,
SIZE_T cbKey,
_In_reads_bytes_( cbMsg ) PCBYTE pbMsg,
SIZE_T cbMsg,
_Out_writes_bytes_( pParams->cbHashOutput ) PBYTE pbOutput )
{
SYMCRYPT_HASH_STATE state;
SymCryptXmssPrfInit(pParams->hash, PrfType, pParams->cbPrefix, &state);
SymCryptHashAppend(pParams->hash, &state, pbKey, cbKey);
SymCryptHashAppend(pParams->hash, &state, pbMsg, cbMsg);
SymCryptHashResult(pParams->hash, &state, pbOutput, pParams->cbHashOutput);
}
VOID
SYMCRYPT_CALL
SymCryptXmssRandHash(
_In_ PCSYMCRYPT_XMSS_PARAMS pParams,
_Inout_ XMSS_ADRS *adrs,
_In_reads_bytes_( pParams->cbHashOutput ) PCBYTE pbSeed,
_In_reads_bytes_( pParams->cbHashOutput ) PCBYTE pbLeft,
_In_reads_bytes_( pParams->cbHashOutput ) PCBYTE pbRight,
_Out_writes_bytes_( pParams->cbHashOutput ) PBYTE pbOutput )
{
BYTE key[SYMCRYPT_HASH_MAX_RESULT_SIZE];
BYTE bitmask[2 * SYMCRYPT_HASH_MAX_RESULT_SIZE];
SYMCRYPT_HASH_STATE stateKeyed;
SYMCRYPT_HASH_STATE stateMask;
SYMCRYPT_ASSERT(pParams->cbHashOutput <= SYMCRYPT_HASH_MAX_RESULT_SIZE);
SymCryptXmssPrfKey(pParams, pbSeed, pParams->cbHashOutput, &stateKeyed);
SYMCRYPT_STORE_MSBFIRST32(adrs->en32KeyAndMask, 1);
SymCryptHashStateCopy(pParams->hash, &stateKeyed, &stateMask);
SymCryptHashAppend(pParams->hash, &stateMask, (PCBYTE)adrs, sizeof(*adrs));
SymCryptHashResult(pParams->hash, &stateMask, &bitmask[0], pParams->cbHashOutput);
SYMCRYPT_STORE_MSBFIRST32(adrs->en32KeyAndMask, 2);
SymCryptHashStateCopy(pParams->hash, &stateKeyed, &stateMask);
SymCryptHashAppend(pParams->hash, &stateMask, (PCBYTE)adrs, sizeof(*adrs));
SymCryptHashResult(pParams->hash, &stateMask, &bitmask[pParams->cbHashOutput], pParams->cbHashOutput);
SYMCRYPT_STORE_MSBFIRST32(adrs->en32KeyAndMask, 0);
SymCryptHashAppend(pParams->hash, &stateKeyed, (PCBYTE)adrs, sizeof(*adrs));
SymCryptHashResult(pParams->hash, &stateKeyed, key, pParams->cbHashOutput);
SymCryptXorBytes(&bitmask[0], pbLeft, &bitmask[0], pParams->cbHashOutput);
SymCryptXorBytes(&bitmask[pParams->cbHashOutput], pbRight, &bitmask[pParams->cbHashOutput], pParams->cbHashOutput);
SymCryptXmssPrf(pParams, SYMCRYPT_XMSS_H, key, pParams->cbHashOutput, bitmask, 2 * pParams->cbHashOutput, pbOutput);
}
VOID
SYMCRYPT_CALL
SymCryptXmssTreeNodeCompress(
_In_ PSYMCRYPT_TREEHASH_NODE pNodeLeft,
_In_ PSYMCRYPT_TREEHASH_NODE pNodeRight,
_Out_ PSYMCRYPT_TREEHASH_NODE pNodeOut,
_Inout_ PSYMCRYPT_XMSS_INCREMENTAL_TREEHASH_CONTEXT pCtxIncHash )
{
SYMCRYPT_STORE_MSBFIRST32(pCtxIncHash->adrs.u.hashtree.en32Height, pNodeLeft->height);
SYMCRYPT_STORE_MSBFIRST32(pCtxIncHash->adrs.u.hashtree.en32Index, pNodeLeft->index / 2);
SymCryptXmssRandHash(
pCtxIncHash->pParams,
&pCtxIncHash->adrs,
pCtxIncHash->pbSeed,
pNodeLeft->value,
pNodeRight->value,
pNodeOut->value);
pNodeOut->index = pNodeLeft->index / 2;
pNodeOut->height = pNodeLeft->height + 1;
}
VOID
SYMCRYPT_CALL
SymCryptXmssLtreeNodeCompress(
_In_ PSYMCRYPT_TREEHASH_NODE pNodeLeft,
_In_ PSYMCRYPT_TREEHASH_NODE pNodeRight,
_Out_ PSYMCRYPT_TREEHASH_NODE pNodeOut,
_Inout_ PSYMCRYPT_XMSS_INCREMENTAL_TREEHASH_CONTEXT pCtxIncHash )
{
SYMCRYPT_STORE_MSBFIRST32(pCtxIncHash->adrs.u.ltree.en32Height, pNodeLeft->height);
SYMCRYPT_STORE_MSBFIRST32(pCtxIncHash->adrs.u.ltree.en32Index, pNodeLeft->index / 2);
SymCryptXmssRandHash(
pCtxIncHash->pParams,
&pCtxIncHash->adrs,
pCtxIncHash->pbSeed,
pNodeLeft->value,
pNodeRight->value,
pNodeOut->value);
pNodeOut->index = pNodeLeft->index / 2;
pNodeOut->height = pNodeLeft->height + 1;
}
VOID
SYMCRYPT_CALL
SymCryptXmssCreateWotspSecret(
_In_ PCSYMCRYPT_XMSS_PARAMS pParams,
_In_reads_bytes_( pParams->cbHashOutput ) PCBYTE pbSkXmss,
_In_reads_bytes_( pParams->cbHashOutput ) PCBYTE pbSeed,
_Inout_ XMSS_ADRS *adrs,
_Out_writes_bytes_( pParams->cbHashOutput ) PBYTE pbOutput )
{
SYMCRYPT_HASH_STATE state;
SymCryptXmssPrfInit(pParams->hash, SYMCRYPT_XMSS_PRF_KEYGEN, pParams->cbPrefix, &state);
SymCryptHashAppend(pParams->hash, &state, pbSkXmss, pParams->cbHashOutput);
SymCryptHashAppend(pParams->hash, &state, pbSeed, pParams->cbHashOutput);
SymCryptHashAppend(pParams->hash, &state, (PCBYTE)adrs, sizeof(*adrs));
SymCryptHashResult(pParams->hash, &state, pbOutput, pParams->cbHashOutput);
}
VOID
SYMCRYPT_CALL
SymCryptXmssChain(
_In_ PCSYMCRYPT_XMSS_PARAMS pParams,
_In_reads_bytes_( pParams->cbHashOutput ) PCBYTE pbInput,
UINT32 startIndex,
UINT32 steps,
_In_reads_bytes_( pParams->cbHashOutput ) PCBYTE pbSeed,
_Inout_ XMSS_ADRS *adrs,
_Out_writes_bytes_( pParams->cbHashOutput ) PBYTE pbOutput )
{
BYTE tmp[SYMCRYPT_HASH_MAX_RESULT_SIZE];
BYTE key[SYMCRYPT_HASH_MAX_RESULT_SIZE];
BYTE bm[SYMCRYPT_HASH_MAX_RESULT_SIZE];
SYMCRYPT_HASH_STATE stateKey;
SYMCRYPT_HASH_STATE stateMask;
memcpy(tmp, pbInput, pParams->cbHashOutput);
for (UINT32 i = startIndex; i < startIndex + steps; i++)
{
SYMCRYPT_STORE_MSBFIRST32(adrs->u.ots.en32Hash, i);
SymCryptXmssPrfKey(pParams, pbSeed, pParams->cbHashOutput, &stateKey);
SymCryptHashStateCopy(pParams->hash, &stateKey, &stateMask);
SYMCRYPT_STORE_MSBFIRST32(adrs->en32KeyAndMask, 0);
SymCryptHashAppend(pParams->hash, &stateKey, (PCBYTE)adrs, sizeof(*adrs));
SymCryptHashResult(pParams->hash, &stateKey, key, pParams->cbHashOutput);
SYMCRYPT_STORE_MSBFIRST32(adrs->en32KeyAndMask, 1);
SymCryptHashAppend(pParams->hash, &stateMask, (PCBYTE)adrs, sizeof(*adrs));
SymCryptHashResult(pParams->hash, &stateMask, bm, pParams->cbHashOutput);
SymCryptXorBytes(tmp, bm, tmp, pParams->cbHashOutput);
SymCryptXmssPrf(pParams, SYMCRYPT_XMSS_F, key, pParams->cbHashOutput, tmp, pParams->cbHashOutput, tmp);
}
// reset used ADRS fields
SYMCRYPT_STORE_MSBFIRST32(adrs->u.ots.en32Hash, 0);
SYMCRYPT_STORE_MSBFIRST32(adrs->en32KeyAndMask, 0);
memcpy(pbOutput, tmp, pParams->cbHashOutput);
}
VOID
SYMCRYPT_CALL
SymCryptXmssCreateWotspPublickey(
_In_ PCSYMCRYPT_XMSS_PARAMS pParams,
_Inout_ XMSS_ADRS *adrs,
UINT32 uLeaf,
_In_reads_bytes_( pParams->cbHashOutput ) PCBYTE pbSkXmss,
_In_reads_bytes_( pParams->cbHashOutput ) PCBYTE pbSeed,
_Out_writes_bytes_opt_( cbScratch ) PBYTE pbScratch,
SIZE_T cbScratch,
_Out_writes_bytes_( pParams->cbHashOutput ) PBYTE pbOutput )
{
PSYMCRYPT_INCREMENTAL_TREEHASH pIncHash = NULL;
PSYMCRYPT_TREEHASH_NODE pNode = NULL;
SYMCRYPT_XMSS_INCREMENTAL_TREEHASH_CONTEXT ctxIncHash;
SYMCRYPT_ASSERT(cbScratch >= SymCryptHbsSizeofScratchBytesForIncrementalTreehash(pParams->cbHashOutput, pParams->len));
SymCryptXmssSetAdrsType(adrs, XMSS_ADRS_TYPE_LTREE);
SYMCRYPT_STORE_MSBFIRST32(adrs->u.ltree.en32Leaf, uLeaf);
ctxIncHash.adrs = *adrs;
ctxIncHash.pParams = pParams;
ctxIncHash.pbSeed = pbSeed;
pIncHash = SymCryptHbsIncrementalTreehashInit(
pParams->len,
pbScratch,
cbScratch,
pParams->cbHashOutput,
SymCryptXmssLtreeNodeCompress,
&ctxIncHash);
for (UINT32 i = 0; i < pParams->len; i++)
{
pNode = SymCryptHbsIncrementalTreehashAllocNode(pIncHash, i);
SymCryptXmssSetAdrsType(adrs, XMSS_ADRS_TYPE_OTS);
SYMCRYPT_STORE_MSBFIRST32(adrs->u.ots.en32Leaf, uLeaf);
SYMCRYPT_STORE_MSBFIRST32(adrs->u.ots.en32Chain, i);
SymCryptXmssCreateWotspSecret(
pParams,
pbSkXmss,
pbSeed,
adrs,
pNode->value);
SymCryptXmssChain(
pParams,
pNode->value,
0,
(1 << pParams->nWinternitzWidth) - 1,
pbSeed,
adrs,
pNode->value);
SymCryptHbsIncrementalTreehashProcess(pIncHash);
}
pNode = SymCryptHbsIncrementalTreehashFinalize(pIncHash);
memcpy(pbOutput, pNode->value, pParams->cbHashOutput);
}
VOID
SYMCRYPT_CALL