/**
 *
 * XMLSec library
 *
 * HMAC Algorithm support (http://www.w3.org/TR/xmldsig-core/#sec-HMAC):
 * The HMAC algorithm (RFC2104 [HMAC]) takes the truncation length in bits
 * as a parameter; if the parameter is not specified then all the bits of the
 * hash are output. An example of an HMAC SignatureMethod element:
 * <SignatureMethod Algorithm="http://www.w3.org/2000/09/xmldsig#hmac-sha1">
 *   <HMACOutputLength>128</HMACOutputLength>
 * </SignatureMethod>
 *
 * This is free software; see Copyright file in the source
 * distribution for preciese wording.
 *
 * Copyright (C) 2002-2003 Aleksey Sanin <aleksey@aleksey.com>
 */
#ifndef XMLSEC_NO_HMAC
#include "globals.h"

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <windows.h>
#include <wincrypt.h>

#include <xmlsec/xmlsec.h>
#include <xmlsec/xmltree.h>
#include <xmlsec/base64.h>
#include <xmlsec/keys.h>
#include <xmlsec/transforms.h>
#include <xmlsec/errors.h>

#include <xmlsec/mscrypto/crypto.h>
#include "private.h"

/* sizes in bits */
#define XMLSEC_MSCRYPTO_MIN_HMAC_SIZE            80
#define XMLSEC_MSCRYPTO_MAX_HMAC_SIZE            256

/**************************************************************************
 *
 * Configuration
 *
 *****************************************************************************/
static int g_xmlsec_mscrypto_hmac_min_length = XMLSEC_MSCRYPTO_MIN_HMAC_SIZE;

/**
 * xmlSecMSCryptoHmacGetMinOutputLength:
 *
 * Gets the value of min HMAC length.
 *
 * Returns: the min HMAC output length
 */
int xmlSecMSCryptoHmacGetMinOutputLength(void)
{
    return g_xmlsec_mscrypto_hmac_min_length;
}

/**
 * xmlSecMSCryptoHmacSetMinOutputLength:
 * @min_length: the new min length
 *
 * Sets the min HMAC output length
 */
void xmlSecMSCryptoHmacSetMinOutputLength(int min_length)
{
    g_xmlsec_mscrypto_hmac_min_length = min_length;
}

/******************************************************************************
 *
 * Internal MSCrypto HMAC CTX
 *
 *****************************************************************************/
typedef struct _xmlSecMSCryptoHmacCtx            xmlSecMSCryptoHmacCtx, *xmlSecMSCryptoHmacCtxPtr;
struct _xmlSecMSCryptoHmacCtx {
    HCRYPTPROV      provider;
    HCRYPTKEY       cryptKey;
    HCRYPTKEY       pubPrivKey;
    ALG_ID          alg_id;
    const xmlSecMSCryptoProviderInfo  * providers;
    HCRYPTHASH      mscHash;
    unsigned char   dgst[XMLSEC_MSCRYPTO_MAX_HMAC_SIZE];
    size_t          dgstSize;   /* dgst size in bytes */
    int             ctxInitialized;
};

/******************************************************************************
 *
 * HMAC transforms
 *
 * xmlSecMSCryptoHmacCtx is located after xmlSecTransform
 *
 *****************************************************************************/
#define xmlSecMSCryptoHmacGetCtx(transform) \
    ((xmlSecMSCryptoHmacCtxPtr)(((xmlSecByte*)(transform)) + sizeof(xmlSecTransform)))
#define xmlSecMSCryptoHmacSize   \
    (sizeof(xmlSecTransform) + sizeof(xmlSecMSCryptoHmacCtx))

static int      xmlSecMSCryptoHmacCheckId                        (xmlSecTransformPtr transform);
static int      xmlSecMSCryptoHmacInitialize                     (xmlSecTransformPtr transform);
static void     xmlSecMSCryptoHmacFinalize                       (xmlSecTransformPtr transform);
static int      xmlSecMSCryptoHmacNodeRead                       (xmlSecTransformPtr transform,
                                                                 xmlNodePtr node,
                                                                 xmlSecTransformCtxPtr transformCtx);
static int      xmlSecMSCryptoHmacSetKeyReq                      (xmlSecTransformPtr transform,
                                                                 xmlSecKeyReqPtr keyReq);
static int      xmlSecMSCryptoHmacSetKey                         (xmlSecTransformPtr transform,
                                                                 xmlSecKeyPtr key);
static int      xmlSecMSCryptoHmacVerify                         (xmlSecTransformPtr transform,
                                                                 const xmlSecByte* data,
                                                                 xmlSecSize dataSize,
                                                                 xmlSecTransformCtxPtr transformCtx);
static int      xmlSecMSCryptoHmacExecute                        (xmlSecTransformPtr transform,
                                                                 int last,
                                                                 xmlSecTransformCtxPtr transformCtx);

/* Ordered list of providers to search for algorithm implementation using
 * xmlSecMSCryptoFindProvider() function
 *
 * MUST END with { NULL, 0 } !!!
 */
static xmlSecMSCryptoProviderInfo xmlSecMSCryptoProviderInfo_Hmac[] = {
    { XMLSEC_CRYPTO_MS_ENH_RSA_AES_PROV,                PROV_RSA_AES},
    { XMLSEC_CRYPTO_MS_ENH_RSA_AES_PROV_PROTOTYPE,      PROV_RSA_AES },
    { MS_STRONG_PROV,                                   PROV_RSA_FULL },
    { MS_ENHANCED_PROV,                                 PROV_RSA_FULL },
    { MS_DEF_PROV,                                      PROV_RSA_FULL },
    { NULL, 0 }
};

static int
xmlSecMSCryptoHmacCheckId(xmlSecTransformPtr transform) {

#ifndef XMLSEC_NO_SHA1
    if(xmlSecTransformCheckId(transform, xmlSecMSCryptoTransformHmacSha1Id)) {
        return(1);
    } else
#endif /* XMLSEC_NO_SHA1 */

#ifndef XMLSEC_NO_SHA256
    if(xmlSecTransformCheckId(transform, xmlSecMSCryptoTransformHmacSha256Id)) {
        return(1);
    } else
#endif /* XMLSEC_NO_SHA256 */

#ifndef XMLSEC_NO_SHA384
    if(xmlSecTransformCheckId(transform, xmlSecMSCryptoTransformHmacSha384Id)) {
        return(1);
    } else
#endif /* XMLSEC_NO_SHA384 */

#ifndef XMLSEC_NO_SHA512
    if(xmlSecTransformCheckId(transform, xmlSecMSCryptoTransformHmacSha512Id)) {
        return(1);
    } else
#endif /* XMLSEC_NO_SHA512 */

#ifndef XMLSEC_NO_MD5
    if(xmlSecTransformCheckId(transform, xmlSecMSCryptoTransformHmacMd5Id)) {
        return(1);
    } else
#endif /* XMLSEC_NO_MD5 */

    /* not found */
    {
        return(0);
    }

    return(0);
}

static int
xmlSecMSCryptoHmacInitialize(xmlSecTransformPtr transform) {
    xmlSecMSCryptoHmacCtxPtr ctx;

    xmlSecAssert2(xmlSecMSCryptoHmacCheckId(transform), -1);
    xmlSecAssert2(xmlSecTransformCheckSize(transform, xmlSecMSCryptoHmacSize), -1);

    ctx = xmlSecMSCryptoHmacGetCtx(transform);
    xmlSecAssert2(ctx != NULL, -1);

    /* initialize context */
    memset(ctx, 0, sizeof(xmlSecMSCryptoHmacCtx));

#ifndef XMLSEC_NO_SHA1
    if(xmlSecTransformCheckId(transform, xmlSecMSCryptoTransformHmacSha1Id)) {
        ctx->alg_id = CALG_SHA1;
        ctx->providers = xmlSecMSCryptoProviderInfo_Hmac;
    } else
#endif /* XMLSEC_NO_SHA1 */

#ifndef XMLSEC_NO_SHA256
    if(xmlSecTransformCheckId(transform, xmlSecMSCryptoTransformHmacSha256Id)) {
        ctx->alg_id = CALG_SHA_256;
        ctx->providers = xmlSecMSCryptoProviderInfo_Hmac;
    } else
#endif /* XMLSEC_NO_SHA256 */

#ifndef XMLSEC_NO_SHA384
    if(xmlSecTransformCheckId(transform, xmlSecMSCryptoTransformHmacSha384Id)) {
        ctx->alg_id = CALG_SHA_384;
        ctx->providers = xmlSecMSCryptoProviderInfo_Hmac;
    } else
#endif /* XMLSEC_NO_SHA384 */

#ifndef XMLSEC_NO_SHA512
    if(xmlSecTransformCheckId(transform, xmlSecMSCryptoTransformHmacSha512Id)) {
        ctx->alg_id = CALG_SHA_512;
        ctx->providers = xmlSecMSCryptoProviderInfo_Hmac;
    } else
#endif /* XMLSEC_NO_SHA512 */

#ifndef XMLSEC_NO_MD5
    if(xmlSecTransformCheckId(transform, xmlSecMSCryptoTransformHmacMd5Id)) {
        ctx->alg_id = CALG_MD5;
        ctx->providers = xmlSecMSCryptoProviderInfo_Hmac;
    } else
#endif /* XMLSEC_NO_MD5 */

    /* not found */
    {
        xmlSecError(XMLSEC_ERRORS_HERE,
                    xmlSecErrorsSafeString(xmlSecTransformGetName(transform)),
                    NULL,
                    XMLSEC_ERRORS_R_INVALID_TRANSFORM,
                    XMLSEC_ERRORS_NO_MESSAGE);
        return(-1);
    }

    ctx->provider = xmlSecMSCryptoFindProvider(ctx->providers, NULL, CRYPT_VERIFYCONTEXT, TRUE);
    if(ctx->provider == 0) {
        xmlSecError(XMLSEC_ERRORS_HERE,
            xmlSecErrorsSafeString(xmlSecTransformGetName(transform)),
            "xmlSecMSCryptoFindProvider",
            XMLSEC_ERRORS_R_XMLSEC_FAILED,
            XMLSEC_ERRORS_NO_MESSAGE);
        return(-1);
    }

    /* Create dummy key to be able to import plain session keys */
    if (!xmlSecMSCryptoCreatePrivateExponentOneKey(ctx->provider, &(ctx->pubPrivKey))) {
        xmlSecError(XMLSEC_ERRORS_HERE,
                    xmlSecErrorsSafeString(xmlSecTransformGetName(transform)),
                    "xmlSecMSCryptoCreatePrivateExponentOneKey",
                    XMLSEC_ERRORS_R_CRYPTO_FAILED,
                    XMLSEC_ERRORS_NO_MESSAGE);

        return(-1);
    }

    return(0);
}

static void
xmlSecMSCryptoHmacFinalize(xmlSecTransformPtr transform) {
    xmlSecMSCryptoHmacCtxPtr ctx;

    xmlSecAssert(xmlSecMSCryptoHmacCheckId(transform));
    xmlSecAssert(xmlSecTransformCheckSize(transform, xmlSecMSCryptoHmacSize));

    ctx = xmlSecMSCryptoHmacGetCtx(transform);
    xmlSecAssert(ctx != NULL);

    if(ctx->mscHash != 0) {
        CryptDestroyHash(ctx->mscHash);
    }
    if (ctx->cryptKey) {
        CryptDestroyKey(ctx->cryptKey);
    }
    if (ctx->pubPrivKey) {
        CryptDestroyKey(ctx->pubPrivKey);
    }
    if(ctx->provider != 0) {
        CryptReleaseContext(ctx->provider, 0);
    }

    memset(ctx, 0, sizeof(xmlSecMSCryptoHmacCtx));
}

static int
xmlSecMSCryptoHmacNodeRead(xmlSecTransformPtr transform, xmlNodePtr node, xmlSecTransformCtxPtr transformCtx) {
    xmlSecMSCryptoHmacCtxPtr ctx;
    xmlNodePtr cur;

    xmlSecAssert2(xmlSecMSCryptoHmacCheckId(transform), -1);
    xmlSecAssert2(xmlSecTransformCheckSize(transform, xmlSecMSCryptoHmacSize), -1);
    xmlSecAssert2(node!= NULL, -1);
    xmlSecAssert2(transformCtx != NULL, -1);

    ctx = xmlSecMSCryptoHmacGetCtx(transform);
    xmlSecAssert2(ctx != NULL, -1);

    cur = xmlSecGetNextElementNode(node->children);
    if((cur != NULL) && xmlSecCheckNodeName(cur, xmlSecNodeHMACOutputLength, xmlSecDSigNs)) {
        xmlChar *content;

        content = xmlNodeGetContent(cur);
        if(content != NULL) {
            ctx->dgstSize = atoi((char*)content);
            xmlFree(content);
        }

        /* Ensure that HMAC length is greater than min specified.
           Otherwise, an attacker can set this length to 0 or very
           small value
        */
        if((int)ctx->dgstSize < xmlSecMSCryptoHmacGetMinOutputLength()) {
           xmlSecError(XMLSEC_ERRORS_HERE,
                    xmlSecErrorsSafeString(xmlSecTransformGetName(transform)),
                    xmlSecErrorsSafeString(xmlSecNodeGetName(cur)),
                    XMLSEC_ERRORS_R_INVALID_NODE_ATTRIBUTE,
                    "HMAC output length is too small");
           return(-1);
        }

        cur = xmlSecGetNextElementNode(cur->next);
    }

    if(cur != NULL) {
        xmlSecError(XMLSEC_ERRORS_HERE,
                    xmlSecErrorsSafeString(xmlSecTransformGetName(transform)),
                    xmlSecErrorsSafeString(xmlSecNodeGetName(cur)),
                    XMLSEC_ERRORS_R_UNEXPECTED_NODE,
                    XMLSEC_ERRORS_NO_MESSAGE);
        return(-1);
    }
    return(0);
}

static int
xmlSecMSCryptoHmacSetKeyReq(xmlSecTransformPtr transform,  xmlSecKeyReqPtr keyReq) {
    xmlSecAssert2(xmlSecMSCryptoHmacCheckId(transform), -1);
    xmlSecAssert2((transform->operation == xmlSecTransformOperationSign) || (transform->operation == xmlSecTransformOperationVerify), -1);
    xmlSecAssert2(xmlSecTransformCheckSize(transform, xmlSecMSCryptoHmacSize), -1);
    xmlSecAssert2(keyReq != NULL, -1);

    keyReq->keyId   = xmlSecMSCryptoKeyDataHmacId;
    keyReq->keyType = xmlSecKeyDataTypeSymmetric;
    if(transform->operation == xmlSecTransformOperationSign) {
        keyReq->keyUsage = xmlSecKeyUsageSign;
    } else {
        keyReq->keyUsage = xmlSecKeyUsageVerify;
    }

    return(0);
}

static int
xmlSecMSCryptoHmacSetKey(xmlSecTransformPtr transform, xmlSecKeyPtr key) {
    xmlSecMSCryptoHmacCtxPtr ctx;
    xmlSecKeyDataPtr value;
    xmlSecBufferPtr buffer;
    HMAC_INFO hmacInfo;
    int ret;

    xmlSecAssert2(xmlSecMSCryptoHmacCheckId(transform), -1);
    xmlSecAssert2((transform->operation == xmlSecTransformOperationSign) || (transform->operation == xmlSecTransformOperationVerify), -1);
    xmlSecAssert2(xmlSecTransformCheckSize(transform, xmlSecMSCryptoHmacSize), -1);
    xmlSecAssert2(key != NULL, -1);

    ctx = xmlSecMSCryptoHmacGetCtx(transform);
    xmlSecAssert2(ctx != NULL, -1);
    xmlSecAssert2(ctx->ctxInitialized == 0, -1);
    xmlSecAssert2(ctx->provider != 0, -1);
    xmlSecAssert2(ctx->pubPrivKey != 0, -1);
    xmlSecAssert2(ctx->cryptKey == 0, -1);
    xmlSecAssert2(ctx->mscHash == 0, -1);

    value = xmlSecKeyGetValue(key);
    xmlSecAssert2(xmlSecKeyDataCheckId(value, xmlSecMSCryptoKeyDataHmacId), -1);

    buffer = xmlSecKeyDataBinaryValueGetBuffer(value);
    xmlSecAssert2(buffer != NULL, -1);

    if(xmlSecBufferGetSize(buffer) == 0) {
        xmlSecError(XMLSEC_ERRORS_HERE,
                    xmlSecErrorsSafeString(xmlSecTransformGetName(transform)),
                    NULL,
                    XMLSEC_ERRORS_R_INVALID_KEY_DATA_SIZE,
                    "keySize=0");
        return(-1);
    }

    xmlSecAssert2(xmlSecBufferGetData(buffer) != NULL, -1);

    /* Import this key and get an HCRYPTKEY handle. 
     * 
     * HACK!!! HACK!!! HACK!!! 
     * 
     * Using CALG_RC2 instead of CALG_HMAC for the key algorithm so we don't want to check key length
     */
    if (!xmlSecMSCryptoImportPlainSessionBlob(ctx->provider,
        ctx->pubPrivKey,
        CALG_RC2,
        xmlSecBufferGetData(buffer),
        xmlSecBufferGetSize(buffer),
        FALSE,
        &(ctx->cryptKey)
        ) || (ctx->cryptKey == 0))  {

        xmlSecError(XMLSEC_ERRORS_HERE,
                    xmlSecErrorsSafeString(xmlSecTransformGetName(transform)),
                    "xmlSecMSCryptoImportPlainSessionBlob",
                    XMLSEC_ERRORS_R_XMLSEC_FAILED,
                    XMLSEC_ERRORS_NO_MESSAGE);
        return(-1);
    }   

    /* create hash */
    ret = CryptCreateHash(ctx->provider,
        CALG_HMAC,
        ctx->cryptKey,
        0,
        &(ctx->mscHash));
    if((ret == 0) || (ctx->mscHash == 0)) {
        xmlSecError(XMLSEC_ERRORS_HERE,
                    xmlSecErrorsSafeString(xmlSecTransformGetName(transform)),
                    "CryptCreateHash",
                    XMLSEC_ERRORS_R_CRYPTO_FAILED,
                    XMLSEC_ERRORS_NO_MESSAGE);
        return(-1);
    }

    /* set parameters */
    memset(&hmacInfo, 0, sizeof(hmacInfo));
    hmacInfo.HashAlgid = ctx->alg_id;
    ret = CryptSetHashParam(ctx->mscHash, HP_HMAC_INFO, (BYTE*)&hmacInfo, 0);
    if(ret == 0) {
        xmlSecError(XMLSEC_ERRORS_HERE,
                    xmlSecErrorsSafeString(xmlSecTransformGetName(transform)),
                    "CryptSetHashParam",
                    XMLSEC_ERRORS_R_CRYPTO_FAILED,
                    XMLSEC_ERRORS_NO_MESSAGE);
        return(-1);
    }

    /* done */
    ctx->ctxInitialized = 1;
    return(0);
}

static int
xmlSecMSCryptoHmacVerify(xmlSecTransformPtr transform,
                        const xmlSecByte* data, xmlSecSize dataSize,
                        xmlSecTransformCtxPtr transformCtx) {
    static xmlSecByte last_byte_masks[] =
                { 0xFF, 0x80, 0xC0, 0xE0, 0xF0, 0xF8, 0xFC, 0xFE };

    xmlSecMSCryptoHmacCtxPtr ctx;
    xmlSecByte mask;

    xmlSecAssert2(xmlSecTransformIsValid(transform), -1);
    xmlSecAssert2(xmlSecTransformCheckSize(transform, xmlSecMSCryptoHmacSize), -1);
    xmlSecAssert2(transform->operation == xmlSecTransformOperationVerify, -1);
    xmlSecAssert2(transform->status == xmlSecTransformStatusFinished, -1);
    xmlSecAssert2(data != NULL, -1);
    xmlSecAssert2(transformCtx != NULL, -1);

    ctx = xmlSecMSCryptoHmacGetCtx(transform);
    xmlSecAssert2(ctx != NULL, -1);
    xmlSecAssert2(ctx->dgstSize > 0, -1);

    /* compare the digest size in bytes */
    if(dataSize != ((ctx->dgstSize + 7) / 8)){
        /* NO COMMIT */
        xmlChar* a;
        mask = last_byte_masks[ctx->dgstSize % 8];
        ctx->dgst[dataSize - 1] &= mask;
        a = xmlSecBase64Encode(ctx->dgst, (ctx->dgstSize + 7) / 8, -1);
        fprintf(stderr, "%s\n", a);
        xmlFree(a);

        xmlSecError(XMLSEC_ERRORS_HERE,
                    xmlSecErrorsSafeString(xmlSecTransformGetName(transform)),
                    NULL,
                    XMLSEC_ERRORS_R_INVALID_SIZE,
                    "data=%d;dgst=%d",
                    dataSize, ((ctx->dgstSize + 7) / 8));
        transform->status = xmlSecTransformStatusFail;
        return(0);
    }

    /* we check the last byte separatelly */
    xmlSecAssert2(dataSize > 0, -1);
    mask = last_byte_masks[ctx->dgstSize % 8];
    if((ctx->dgst[dataSize - 1] & mask) != (data[dataSize - 1]  & mask)) {
        xmlSecError(XMLSEC_ERRORS_HERE,
                    xmlSecErrorsSafeString(xmlSecTransformGetName(transform)),
                    NULL,
                    XMLSEC_ERRORS_R_DATA_NOT_MATCH,
                    "data and digest do not match (last byte)");
        transform->status = xmlSecTransformStatusFail;
        return(0);
    }

    /* now check the rest of the digest */
    if((dataSize > 1) && (memcmp(ctx->dgst, data, dataSize - 1) != 0)) {
        xmlSecError(XMLSEC_ERRORS_HERE,
                    xmlSecErrorsSafeString(xmlSecTransformGetName(transform)),
                    NULL,
                    XMLSEC_ERRORS_R_DATA_NOT_MATCH,
                    "data and digest do not match");
        transform->status = xmlSecTransformStatusFail;
        return(0);
    }

    transform->status = xmlSecTransformStatusOk;
    return(0);
}

static int
xmlSecMSCryptoHmacExecute(xmlSecTransformPtr transform, int last, xmlSecTransformCtxPtr transformCtx) {
    xmlSecMSCryptoHmacCtxPtr ctx;
    xmlSecBufferPtr in, out;
    int ret;

    xmlSecAssert2(xmlSecTransformIsValid(transform), -1);
    xmlSecAssert2((transform->operation == xmlSecTransformOperationSign) || (transform->operation == xmlSecTransformOperationVerify), -1);
    xmlSecAssert2(xmlSecTransformCheckSize(transform, xmlSecMSCryptoHmacSize), -1);
    xmlSecAssert2(transformCtx != NULL, -1);

    in = &(transform->inBuf);
    out = &(transform->outBuf);

    ctx = xmlSecMSCryptoHmacGetCtx(transform);
    xmlSecAssert2(ctx != NULL, -1);
    xmlSecAssert2(ctx->ctxInitialized != 0, -1);

    if(transform->status == xmlSecTransformStatusNone) {
        /* we should be already initialized when we set key */
        transform->status = xmlSecTransformStatusWorking;
    }

    if(transform->status == xmlSecTransformStatusWorking) {
        xmlSecSize inSize;

        inSize = xmlSecBufferGetSize(in);
        if(inSize > 0) {
            ret = CryptHashData(ctx->mscHash,
                xmlSecBufferGetData(in),
                inSize,
                0);

            if(ret == 0) {
                xmlSecError(XMLSEC_ERRORS_HERE,
                            xmlSecErrorsSafeString(xmlSecTransformGetName(transform)),
                            "CryptHashData",
                            XMLSEC_ERRORS_R_CRYPTO_FAILED,
                            "size=%d", inSize);
                return(-1);
            }

            ret = xmlSecBufferRemoveHead(in, inSize);
            if(ret < 0) {
                xmlSecError(XMLSEC_ERRORS_HERE,
                            xmlSecErrorsSafeString(xmlSecTransformGetName(transform)),
                            "xmlSecBufferRemoveHead",
                            XMLSEC_ERRORS_R_XMLSEC_FAILED,
                            "size=%d", inSize);
                return(-1);
            }
        }

        if(last) {
            /* TODO: make a MSCrypto compatible assert here */
            /* xmlSecAssert2((xmlSecSize)EVP_MD_size(ctx->digest) <= sizeof(ctx->dgst), -1); */
            DWORD retLen;
            retLen = XMLSEC_MSCRYPTO_MAX_HMAC_SIZE;

            ret = CryptGetHashParam(ctx->mscHash,
                HP_HASHVAL,
                ctx->dgst,
                &retLen,
                0);

            if (ret == 0) {
                xmlSecError(XMLSEC_ERRORS_HERE,
                            xmlSecErrorsSafeString(xmlSecTransformGetName(transform)),
                            "CryptGetHashParam",
                            XMLSEC_ERRORS_R_XMLSEC_FAILED,
                            "size=%d", inSize);
                return(-1);
            }
            xmlSecAssert2(retLen > 0, -1);

            /* check/set the result digest size */
            if(ctx->dgstSize == 0) {
                ctx->dgstSize = retLen * 8; /* no dgst size specified, use all we have */
            } else if(ctx->dgstSize <= 8 * retLen) {
                retLen = ((ctx->dgstSize + 7) / 8); /* we need to truncate result digest */
            } else {
                xmlSecError(XMLSEC_ERRORS_HERE,
                            xmlSecErrorsSafeString(xmlSecTransformGetName(transform)),
                            NULL,
                            XMLSEC_ERRORS_R_INVALID_SIZE,
                            "result-bits=%d;required-bits=%d",
                            8 * retLen, ctx->dgstSize);
                return(-1);
            }

            /* copy result to output */
            if(transform->operation == xmlSecTransformOperationSign) {
                ret = xmlSecBufferAppend(out, ctx->dgst, retLen);
                if(ret < 0) {
                    xmlSecError(XMLSEC_ERRORS_HERE,
                                xmlSecErrorsSafeString(xmlSecTransformGetName(transform)),
                                "xmlSecBufferAppend",
                                XMLSEC_ERRORS_R_XMLSEC_FAILED,
                                "size=%d", ctx->dgstSize);
                    return(-1);
                }
            }
            transform->status = xmlSecTransformStatusFinished;
        }
    } else if(transform->status == xmlSecTransformStatusFinished) {
        /* the only way we can get here is if there is no input */
        xmlSecAssert2(xmlSecBufferGetSize(in) == 0, -1);
    } else {
        xmlSecError(XMLSEC_ERRORS_HERE,
                    xmlSecErrorsSafeString(xmlSecTransformGetName(transform)),
                    NULL,
                    XMLSEC_ERRORS_R_INVALID_STATUS,
                    "status=%d", transform->status);
        return(-1);
    }

    return(0);
}

#ifndef XMLSEC_NO_MD5
/******************************************************************************
 *
 * HMAC MD5
 *
 ******************************************************************************/
static xmlSecTransformKlass xmlSecMSCryptoHmacMd5Klass = {
    /* klass/object sizes */
    sizeof(xmlSecTransformKlass),               /* xmlSecSize klassSize */
    xmlSecMSCryptoHmacSize,                      /* xmlSecSize objSize */

    xmlSecNameHmacMd5,                          /* const xmlChar* name; */
    xmlSecHrefHmacMd5,                          /* const xmlChar* href; */
    xmlSecTransformUsageSignatureMethod,        /* xmlSecTransformUsage usage; */

    xmlSecMSCryptoHmacInitialize,                /* xmlSecTransformInitializeMethod initialize; */
    xmlSecMSCryptoHmacFinalize,                  /* xmlSecTransformFinalizeMethod finalize; */
    xmlSecMSCryptoHmacNodeRead,                  /* xmlSecTransformNodeReadMethod readNode; */
    NULL,                                       /* xmlSecTransformNodeWriteMethod writeNode; */
    xmlSecMSCryptoHmacSetKeyReq,                 /* xmlSecTransformSetKeyReqMethod setKeyReq; */
    xmlSecMSCryptoHmacSetKey,                    /* xmlSecTransformSetKeyMethod setKey; */
    xmlSecMSCryptoHmacVerify,                    /* xmlSecTransformValidateMethod validate; */
    xmlSecTransformDefaultGetDataType,          /* xmlSecTransformGetDataTypeMethod getDataType; */
    xmlSecTransformDefaultPushBin,              /* xmlSecTransformPushBinMethod pushBin; */
    xmlSecTransformDefaultPopBin,               /* xmlSecTransformPopBinMethod popBin; */
    NULL,                                       /* xmlSecTransformPushXmlMethod pushXml; */
    NULL,                                       /* xmlSecTransformPopXmlMethod popXml; */
    xmlSecMSCryptoHmacExecute,                   /* xmlSecTransformExecuteMethod execute; */

    NULL,                                       /* void* reserved0; */
    NULL,                                       /* void* reserved1; */
};

/**
 * xmlSecMSCryptoTransformHmacMd5GetKlass:
 *
 * The HMAC-MD5 transform klass.
 *
 * Returns: the HMAC-MD5 transform klass.
 */
xmlSecTransformId
xmlSecMSCryptoTransformHmacMd5GetKlass(void) {
    return(&xmlSecMSCryptoHmacMd5Klass);
}

#endif /* XMLSEC_NO_MD5 */


#ifndef XMLSEC_NO_RIPEMD160
/******************************************************************************
 *
 * HMAC RIPEMD160
 *
 ******************************************************************************/
static xmlSecTransformKlass xmlSecMSCryptoHmacRipemd160Klass = {
    /* klass/object sizes */
    sizeof(xmlSecTransformKlass),               /* xmlSecSize klassSize */
    xmlSecMSCryptoHmacSize,                      /* xmlSecSize objSize */

    xmlSecNameHmacRipemd160,                    /* const xmlChar* name; */
    xmlSecHrefHmacRipemd160,                    /* const xmlChar* href; */
    xmlSecTransformUsageSignatureMethod,        /* xmlSecTransformUsage usage; */

    xmlSecMSCryptoHmacInitialize,                /* xmlSecTransformInitializeMethod initialize; */
    xmlSecMSCryptoHmacFinalize,                  /* xmlSecTransformFinalizeMethod finalize; */
    xmlSecMSCryptoHmacNodeRead,                  /* xmlSecTransformNodeReadMethod readNode; */
    NULL,                                       /* xmlSecTransformNodeWriteMethod writeNode; */
    xmlSecMSCryptoHmacSetKeyReq,                 /* xmlSecTransformSetKeyReqMethod setKeyReq; */
    xmlSecMSCryptoHmacSetKey,                    /* xmlSecTransformSetKeyMethod setKey; */
    xmlSecMSCryptoHmacVerify,                    /* xmlSecTransformValidateMethod validate; */
    xmlSecTransformDefaultGetDataType,          /* xmlSecTransformGetDataTypeMethod getDataType; */
    xmlSecTransformDefaultPushBin,              /* xmlSecTransformPushBinMethod pushBin; */
    xmlSecTransformDefaultPopBin,               /* xmlSecTransformPopBinMethod popBin; */
    NULL,                                       /* xmlSecTransformPushXmlMethod pushXml; */
    NULL,                                       /* xmlSecTransformPopXmlMethod popXml; */
    xmlSecMSCryptoHmacExecute,                   /* xmlSecTransformExecuteMethod execute; */

    NULL,                                       /* void* reserved0; */
    NULL,                                       /* void* reserved1; */
};

/**
 * xmlSecMSCryptoTransformHmacRipemd160GetKlass:
 *
 * The HMAC-RIPEMD160 transform klass.
 *
 * Returns: the HMAC-RIPEMD160 transform klass.
 */
xmlSecTransformId
xmlSecMSCryptoTransformHmacRipemd160GetKlass(void) {
    return(&xmlSecMSCryptoHmacRipemd160Klass);
}
#endif /* XMLSEC_NO_RIPEMD160 */

#ifndef XMLSEC_NO_SHA1
/******************************************************************************
 *
 * HMAC SHA1
 *
 ******************************************************************************/
static xmlSecTransformKlass xmlSecMSCryptoHmacSha1Klass = {
    /* klass/object sizes */
    sizeof(xmlSecTransformKlass),               /* xmlSecSize klassSize */
    xmlSecMSCryptoHmacSize,                      /* xmlSecSize objSize */

    xmlSecNameHmacSha1,                         /* const xmlChar* name; */
    xmlSecHrefHmacSha1,                         /* const xmlChar* href; */
    xmlSecTransformUsageSignatureMethod,        /* xmlSecTransformUsage usage; */

    xmlSecMSCryptoHmacInitialize,                /* xmlSecTransformInitializeMethod initialize; */
    xmlSecMSCryptoHmacFinalize,                  /* xmlSecTransformFinalizeMethod finalize; */
    xmlSecMSCryptoHmacNodeRead,                  /* xmlSecTransformNodeReadMethod readNode; */
    NULL,                                       /* xmlSecTransformNodeWriteMethod writeNode; */
    xmlSecMSCryptoHmacSetKeyReq,                 /* xmlSecTransformSetKeyReqMethod setKeyReq; */
    xmlSecMSCryptoHmacSetKey,                    /* xmlSecTransformSetKeyMethod setKey; */
    xmlSecMSCryptoHmacVerify,                    /* xmlSecTransformValidateMethod validate; */
    xmlSecTransformDefaultGetDataType,          /* xmlSecTransformGetDataTypeMethod getDataType; */
    xmlSecTransformDefaultPushBin,              /* xmlSecTransformPushBinMethod pushBin; */
    xmlSecTransformDefaultPopBin,               /* xmlSecTransformPopBinMethod popBin; */
    NULL,                                       /* xmlSecTransformPushXmlMethod pushXml; */
    NULL,                                       /* xmlSecTransformPopXmlMethod popXml; */
    xmlSecMSCryptoHmacExecute,                   /* xmlSecTransformExecuteMethod execute; */

    NULL,                                       /* void* reserved0; */
    NULL,                                       /* void* reserved1; */
};

/**
 * xmlSecMSCryptoTransformHmacSha1GetKlass:
 *
 * The HMAC-SHA1 transform klass.
 *
 * Returns: the HMAC-SHA1 transform klass.
 */
xmlSecTransformId
xmlSecMSCryptoTransformHmacSha1GetKlass(void) {
    return(&xmlSecMSCryptoHmacSha1Klass);
}

#endif /* XMLSEC_NO_SHA1 */

#ifndef XMLSEC_NO_SHA224
/******************************************************************************
 *
 * HMAC SHA224
 *
 ******************************************************************************/
static xmlSecTransformKlass xmlSecMSCryptoHmacSha224Klass = {
    /* klass/object sizes */
    sizeof(xmlSecTransformKlass),               /* xmlSecSize klassSize */
    xmlSecMSCryptoHmacSize,                      /* xmlSecSize objSize */

    xmlSecNameHmacSha224,                       /* const xmlChar* name; */
    xmlSecHrefHmacSha224,                       /* const xmlChar* href; */
    xmlSecTransformUsageSignatureMethod,        /* xmlSecTransformUsage usage; */

    xmlSecMSCryptoHmacInitialize,                /* xmlSecTransformInitializeMethod initialize; */
    xmlSecMSCryptoHmacFinalize,                  /* xmlSecTransformFinalizeMethod finalize; */
    xmlSecMSCryptoHmacNodeRead,                  /* xmlSecTransformNodeReadMethod readNode; */
    NULL,                                       /* xmlSecTransformNodeWriteMethod writeNode; */
    xmlSecMSCryptoHmacSetKeyReq,                 /* xmlSecTransformSetKeyReqMethod setKeyReq; */
    xmlSecMSCryptoHmacSetKey,                    /* xmlSecTransformSetKeyMethod setKey; */
    xmlSecMSCryptoHmacVerify,                    /* xmlSecTransformValidateMethod validate; */
    xmlSecTransformDefaultGetDataType,          /* xmlSecTransformGetDataTypeMethod getDataType; */
    xmlSecTransformDefaultPushBin,              /* xmlSecTransformPushBinMethod pushBin; */
    xmlSecTransformDefaultPopBin,               /* xmlSecTransformPopBinMethod popBin; */
    NULL,                                       /* xmlSecTransformPushXmlMethod pushXml; */
    NULL,                                       /* xmlSecTransformPopXmlMethod popXml; */
    xmlSecMSCryptoHmacExecute,                   /* xmlSecTransformExecuteMethod execute; */

    NULL,                                       /* void* reserved0; */
    NULL,                                       /* void* reserved1; */
};

/**
 * xmlSecMSCryptoTransformHmacSha224GetKlass:
 *
 * The HMAC-SHA224 transform klass.
 *
 * Returns: the HMAC-SHA224 transform klass.
 */
xmlSecTransformId
xmlSecMSCryptoTransformHmacSha224GetKlass(void) {
    return(&xmlSecMSCryptoHmacSha224Klass);
}

#endif /* XMLSEC_NO_SHA224 */

#ifndef XMLSEC_NO_SHA256
/******************************************************************************
 *
 * HMAC SHA256
 *
 ******************************************************************************/
static xmlSecTransformKlass xmlSecMSCryptoHmacSha256Klass = {
    /* klass/object sizes */
    sizeof(xmlSecTransformKlass),               /* xmlSecSize klassSize */
    xmlSecMSCryptoHmacSize,                      /* xmlSecSize objSize */

    xmlSecNameHmacSha256,                       /* const xmlChar* name; */
    xmlSecHrefHmacSha256,                       /* const xmlChar* href; */
    xmlSecTransformUsageSignatureMethod,        /* xmlSecTransformUsage usage; */

    xmlSecMSCryptoHmacInitialize,                /* xmlSecTransformInitializeMethod initialize; */
    xmlSecMSCryptoHmacFinalize,                  /* xmlSecTransformFinalizeMethod finalize; */
    xmlSecMSCryptoHmacNodeRead,                  /* xmlSecTransformNodeReadMethod readNode; */
    NULL,                                       /* xmlSecTransformNodeWriteMethod writeNode; */
    xmlSecMSCryptoHmacSetKeyReq,                 /* xmlSecTransformSetKeyReqMethod setKeyReq; */
    xmlSecMSCryptoHmacSetKey,                    /* xmlSecTransformSetKeyMethod setKey; */
    xmlSecMSCryptoHmacVerify,                    /* xmlSecTransformValidateMethod validate; */
    xmlSecTransformDefaultGetDataType,          /* xmlSecTransformGetDataTypeMethod getDataType; */
    xmlSecTransformDefaultPushBin,              /* xmlSecTransformPushBinMethod pushBin; */
    xmlSecTransformDefaultPopBin,               /* xmlSecTransformPopBinMethod popBin; */
    NULL,                                       /* xmlSecTransformPushXmlMethod pushXml; */
    NULL,                                       /* xmlSecTransformPopXmlMethod popXml; */
    xmlSecMSCryptoHmacExecute,                   /* xmlSecTransformExecuteMethod execute; */

    NULL,                                       /* void* reserved0; */
    NULL,                                       /* void* reserved1; */
};

/**
 * xmlSecMSCryptoTransformHmacSha256GetKlass:
 *
 * The HMAC-SHA256 transform klass.
 *
 * Returns: the HMAC-SHA256 transform klass.
 */
xmlSecTransformId
xmlSecMSCryptoTransformHmacSha256GetKlass(void) {
    return(&xmlSecMSCryptoHmacSha256Klass);
}

#endif /* XMLSEC_NO_SHA256 */

#ifndef XMLSEC_NO_SHA384
/******************************************************************************
 *
 * HMAC SHA384
 *
 ******************************************************************************/
static xmlSecTransformKlass xmlSecMSCryptoHmacSha384Klass = {
    /* klass/object sizes */
    sizeof(xmlSecTransformKlass),               /* xmlSecSize klassSize */
    xmlSecMSCryptoHmacSize,                      /* xmlSecSize objSize */

    xmlSecNameHmacSha384,                       /* const xmlChar* name; */
    xmlSecHrefHmacSha384,                       /* const xmlChar* href; */
    xmlSecTransformUsageSignatureMethod,        /* xmlSecTransformUsage usage; */

    xmlSecMSCryptoHmacInitialize,                /* xmlSecTransformInitializeMethod initialize; */
    xmlSecMSCryptoHmacFinalize,                  /* xmlSecTransformFinalizeMethod finalize; */
    xmlSecMSCryptoHmacNodeRead,                  /* xmlSecTransformNodeReadMethod readNode; */
    NULL,                                       /* xmlSecTransformNodeWriteMethod writeNode; */
    xmlSecMSCryptoHmacSetKeyReq,                 /* xmlSecTransformSetKeyReqMethod setKeyReq; */
    xmlSecMSCryptoHmacSetKey,                    /* xmlSecTransformSetKeyMethod setKey; */
    xmlSecMSCryptoHmacVerify,                    /* xmlSecTransformValidateMethod validate; */
    xmlSecTransformDefaultGetDataType,          /* xmlSecTransformGetDataTypeMethod getDataType; */
    xmlSecTransformDefaultPushBin,              /* xmlSecTransformPushBinMethod pushBin; */
    xmlSecTransformDefaultPopBin,               /* xmlSecTransformPopBinMethod popBin; */
    NULL,                                       /* xmlSecTransformPushXmlMethod pushXml; */
    NULL,                                       /* xmlSecTransformPopXmlMethod popXml; */
    xmlSecMSCryptoHmacExecute,                   /* xmlSecTransformExecuteMethod execute; */

    NULL,                                       /* void* reserved0; */
    NULL,                                       /* void* reserved1; */
};

/**
 * xmlSecMSCryptoTransformHmacSha384GetKlass:
 *
 * The HMAC-SHA384 transform klass.
 *
 * Returns: the HMAC-SHA384 transform klass.
 */
xmlSecTransformId
xmlSecMSCryptoTransformHmacSha384GetKlass(void) {
    return(&xmlSecMSCryptoHmacSha384Klass);
}

#endif /* XMLSEC_NO_SHA384 */

#ifndef XMLSEC_NO_SHA512
/******************************************************************************
 *
 * HMAC SHA512
 *
 ******************************************************************************/
static xmlSecTransformKlass xmlSecMSCryptoHmacSha512Klass = {
    /* klass/object sizes */
    sizeof(xmlSecTransformKlass),               /* xmlSecSize klassSize */
    xmlSecMSCryptoHmacSize,                      /* xmlSecSize objSize */

    xmlSecNameHmacSha512,                       /* const xmlChar* name; */
    xmlSecHrefHmacSha512,                       /* const xmlChar* href; */
    xmlSecTransformUsageSignatureMethod,        /* xmlSecTransformUsage usage; */

    xmlSecMSCryptoHmacInitialize,                /* xmlSecTransformInitializeMethod initialize; */
    xmlSecMSCryptoHmacFinalize,                  /* xmlSecTransformFinalizeMethod finalize; */
    xmlSecMSCryptoHmacNodeRead,                  /* xmlSecTransformNodeReadMethod readNode; */
    NULL,                                       /* xmlSecTransformNodeWriteMethod writeNode; */
    xmlSecMSCryptoHmacSetKeyReq,                 /* xmlSecTransformSetKeyReqMethod setKeyReq; */
    xmlSecMSCryptoHmacSetKey,                    /* xmlSecTransformSetKeyMethod setKey; */
    xmlSecMSCryptoHmacVerify,                    /* xmlSecTransformValidateMethod validate; */
    xmlSecTransformDefaultGetDataType,          /* xmlSecTransformGetDataTypeMethod getDataType; */
    xmlSecTransformDefaultPushBin,              /* xmlSecTransformPushBinMethod pushBin; */
    xmlSecTransformDefaultPopBin,               /* xmlSecTransformPopBinMethod popBin; */
    NULL,                                       /* xmlSecTransformPushXmlMethod pushXml; */
    NULL,                                       /* xmlSecTransformPopXmlMethod popXml; */
    xmlSecMSCryptoHmacExecute,                   /* xmlSecTransformExecuteMethod execute; */

    NULL,                                       /* void* reserved0; */
    NULL,                                       /* void* reserved1; */
};

/**
 * xmlSecMSCryptoTransformHmacSha512GetKlass:
 *
 * The HMAC-SHA512 transform klass.
 *
 * Returns: the HMAC-SHA512 transform klass.
 */
xmlSecTransformId
xmlSecMSCryptoTransformHmacSha512GetKlass(void) {
    return(&xmlSecMSCryptoHmacSha512Klass);
}

#endif /* XMLSEC_NO_SHA512 */


#endif /* XMLSEC_NO_HMAC */