/**
 * XMLSec library
 *
 * This is free software; see Copyright file in the source
 * distribution for preciese wording.
 *
 * Copyright (C) 2002-2003 Aleksey Sanin <aleksey@aleksey.com>
 * Copyright (c) 2003 America Online, Inc.  All rights reserved.
 */
#include "globals.h"

#include <string.h>

#include <nspr.h>
#include <nss.h>
#include <secoid.h>
#include <pk11func.h>

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

#include <xmlsec/nss/app.h>
#include <xmlsec/nss/crypto.h>

#define XMLSEC_NSS_MAX_DIGEST_SIZE              64

/**************************************************************************
 *
 * Internal NSS Digest CTX
 *
 *****************************************************************************/
typedef struct _xmlSecNssDigestCtx              xmlSecNssDigestCtx, *xmlSecNssDigestCtxPtr;
struct _xmlSecNssDigestCtx {
    SECOidData*         digest;
    PK11Context*        digestCtx;
    xmlSecByte          dgst[XMLSEC_NSS_MAX_DIGEST_SIZE];
    xmlSecSize          dgstSize;       /* dgst size in bytes */
};

/******************************************************************************
 *
 * Digest transforms
 *
 * xmlSecNssDigestCtx is located after xmlSecTransform
 *
 *****************************************************************************/
#define xmlSecNssDigestSize     \
    (sizeof(xmlSecTransform) + sizeof(xmlSecNssDigestCtx))
#define xmlSecNssDigestGetCtx(transform) \
    ((xmlSecNssDigestCtxPtr)(((xmlSecByte*)(transform)) + sizeof(xmlSecTransform)))

static int      xmlSecNssDigestCheckId                  (xmlSecTransformPtr transform);
static int      xmlSecNssDigestInitialize               (xmlSecTransformPtr transform);
static void     xmlSecNssDigestFinalize                 (xmlSecTransformPtr transform);
static int      xmlSecNssDigestVerify                   (xmlSecTransformPtr transform,
                                                         const xmlSecByte* data,
                                                         xmlSecSize dataSize,
                                                         xmlSecTransformCtxPtr transformCtx);
static int      xmlSecNssDigestExecute                  (xmlSecTransformPtr transform,
                                                         int last,
                                                         xmlSecTransformCtxPtr transformCtx);

static int
xmlSecNssDigestCheckId(xmlSecTransformPtr transform) {

#ifndef XMLSEC_NO_MD5
    if(xmlSecTransformCheckId(transform, xmlSecNssTransformMd5Id)) {
        return(1);
    }
#endif /* XMLSEC_NO_MD5 */

#ifndef XMLSEC_NO_SHA1
    if(xmlSecTransformCheckId(transform, xmlSecNssTransformSha1Id)) {
        return(1);
    }
#endif /* XMLSEC_NO_SHA1 */

#ifndef XMLSEC_NO_SHA256
    if(xmlSecTransformCheckId(transform, xmlSecNssTransformSha256Id)) {
        return(1);
    }
#endif /* XMLSEC_NO_SHA256 */

#ifndef XMLSEC_NO_SHA384
    if(xmlSecTransformCheckId(transform, xmlSecNssTransformSha384Id)) {
        return(1);
    }
#endif /* XMLSEC_NO_SHA384 */

#ifndef XMLSEC_NO_SHA512
    if(xmlSecTransformCheckId(transform, xmlSecNssTransformSha512Id)) {
        return(1);
    }
#endif /* XMLSEC_NO_SHA512 */

    return(0);
}

static int
xmlSecNssDigestInitialize(xmlSecTransformPtr transform) {
    xmlSecNssDigestCtxPtr ctx;

    xmlSecAssert2(xmlSecNssDigestCheckId(transform), -1);
    xmlSecAssert2(xmlSecTransformCheckSize(transform, xmlSecNssDigestSize), -1);

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

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

#ifndef XMLSEC_NO_MD5
    if(xmlSecTransformCheckId(transform, xmlSecNssTransformMd5Id)) {
        ctx->digest = SECOID_FindOIDByTag(SEC_OID_MD5);
    } else
#endif /* XMLSEC_NO_MD5 */

#ifndef XMLSEC_NO_SHA1
    if(xmlSecTransformCheckId(transform, xmlSecNssTransformSha1Id)) {
        ctx->digest = SECOID_FindOIDByTag(SEC_OID_SHA1);
    } else
#endif /* XMLSEC_NO_SHA1 */


#ifndef XMLSEC_NO_SHA256
    if(xmlSecTransformCheckId(transform, xmlSecNssTransformSha256Id)) {
        ctx->digest = SECOID_FindOIDByTag(SEC_OID_SHA256);
    } else
#endif /* XMLSEC_NO_SHA256 */

#ifndef XMLSEC_NO_SHA384
    if(xmlSecTransformCheckId(transform, xmlSecNssTransformSha384Id)) {
        ctx->digest = SECOID_FindOIDByTag(SEC_OID_SHA384);
    } else
#endif /* XMLSEC_NO_SHA384 */

#ifndef XMLSEC_NO_SHA512
    if(xmlSecTransformCheckId(transform, xmlSecNssTransformSha512Id)) {
        ctx->digest = SECOID_FindOIDByTag(SEC_OID_SHA512);
    } else
#endif /* XMLSEC_NO_SHA512 */

    if(1) {
        xmlSecError(XMLSEC_ERRORS_HERE,
                    xmlSecErrorsSafeString(xmlSecTransformGetName(transform)),
                    NULL,
                    XMLSEC_ERRORS_R_INVALID_TRANSFORM,
                    XMLSEC_ERRORS_NO_MESSAGE);
        return(-1);
    }

    if(ctx->digest == NULL) {
        xmlSecError(XMLSEC_ERRORS_HERE,
                    xmlSecErrorsSafeString(xmlSecTransformGetName(transform)),
                    "SECOID_FindOIDByTag",
                    XMLSEC_ERRORS_R_CRYPTO_FAILED,
                    "error code=%d", PORT_GetError());
        return(-1);
    }

    ctx->digestCtx = PK11_CreateDigestContext(ctx->digest->offset);
    if(ctx->digestCtx == NULL) {
        xmlSecError(XMLSEC_ERRORS_HERE,
                    xmlSecErrorsSafeString(xmlSecTransformGetName(transform)),
                    "PK11_CreateDigestContext",
                    XMLSEC_ERRORS_R_CRYPTO_FAILED,
                    "error code=%d", PORT_GetError());
        return(-1);
    }

    return(0);
}

static void
xmlSecNssDigestFinalize(xmlSecTransformPtr transform) {
    xmlSecNssDigestCtxPtr ctx;

    xmlSecAssert(xmlSecNssDigestCheckId(transform));
    xmlSecAssert(xmlSecTransformCheckSize(transform, xmlSecNssDigestSize));

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

    if(ctx->digestCtx != NULL) {
        PK11_DestroyContext(ctx->digestCtx, PR_TRUE);
    }
    memset(ctx, 0, sizeof(xmlSecNssDigestCtx));
}

static int
xmlSecNssDigestVerify(xmlSecTransformPtr transform,
                        const xmlSecByte* data, xmlSecSize dataSize,
                        xmlSecTransformCtxPtr transformCtx) {
    xmlSecNssDigestCtxPtr ctx;

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

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

    if(dataSize != ctx->dgstSize) {
        xmlSecError(XMLSEC_ERRORS_HERE,
                    xmlSecErrorsSafeString(xmlSecTransformGetName(transform)),
                    NULL,
                    XMLSEC_ERRORS_R_INVALID_DATA,
                    "data and digest sizes are different (data=%d, dgst=%d)",
                    dataSize, ctx->dgstSize);
        transform->status = xmlSecTransformStatusFail;
        return(0);
    }

    if(memcmp(ctx->dgst, data, dataSize) != 0) {
        xmlSecError(XMLSEC_ERRORS_HERE,
                    xmlSecErrorsSafeString(xmlSecTransformGetName(transform)),
                    NULL,
                    XMLSEC_ERRORS_R_INVALID_DATA,
                    "data and digest do not match");
        transform->status = xmlSecTransformStatusFail;
        return(0);
    }

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

static int
xmlSecNssDigestExecute(xmlSecTransformPtr transform, int last, xmlSecTransformCtxPtr transformCtx) {
    xmlSecNssDigestCtxPtr ctx;
    xmlSecBufferPtr in, out;
    SECStatus rv;
    int ret;

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

    ctx = xmlSecNssDigestGetCtx(transform);
    xmlSecAssert2(ctx != NULL, -1);
    xmlSecAssert2(ctx->digestCtx != NULL, -1);

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

    if(transform->status == xmlSecTransformStatusNone) {
        rv = PK11_DigestBegin(ctx->digestCtx);
        if(rv != SECSuccess) {
            xmlSecError(XMLSEC_ERRORS_HERE,
                        xmlSecErrorsSafeString(xmlSecTransformGetName(transform)),
                        "PK11_DigestBegin",
                        XMLSEC_ERRORS_R_CRYPTO_FAILED,
                        "error code=%d", PORT_GetError());
            return(-1);
        }
        transform->status = xmlSecTransformStatusWorking;
    }

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

        inSize = xmlSecBufferGetSize(in);
        if(inSize > 0) {
            rv = PK11_DigestOp(ctx->digestCtx, xmlSecBufferGetData(in), inSize);
            if (rv != SECSuccess) {
                xmlSecError(XMLSEC_ERRORS_HERE,
                            xmlSecErrorsSafeString(xmlSecTransformGetName(transform)),
                            "PK11_DigestOp",
                            XMLSEC_ERRORS_R_CRYPTO_FAILED,
                            "error code=%d", PORT_GetError());
                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) {
            unsigned int dgstSize;

            rv = PK11_DigestFinal(ctx->digestCtx, ctx->dgst, &dgstSize, sizeof(ctx->dgst));
            if(rv != SECSuccess) {
                xmlSecError(XMLSEC_ERRORS_HERE,
                            xmlSecErrorsSafeString(xmlSecTransformGetName(transform)),
                            "PK11_DigestFinal",
                            XMLSEC_ERRORS_R_CRYPTO_FAILED,
                            "error code=%d", PORT_GetError());
                return(-1);
            }
            xmlSecAssert2(dgstSize > 0, -1);
            ctx->dgstSize = XMLSEC_SIZE_BAD_CAST(dgstSize);

            if(transform->operation == xmlSecTransformOperationSign) {
                ret = xmlSecBufferAppend(out, ctx->dgst, ctx->dgstSize);
                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(&(transform->inBuf)) == 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
/******************************************************************************
 *
 * Md5 Digest transforms
 *
 *****************************************************************************/
static xmlSecTransformKlass xmlSecNssMd5Klass = {
    /* klass/object sizes */
    sizeof(xmlSecTransformKlass),               /* xmlSecSize klassSize */
    xmlSecNssDigestSize,                        /* xmlSecSize objSize */

    /* data */
    xmlSecNameMd5,                              /* const xmlChar* name; */
    xmlSecHrefMd5,                              /* const xmlChar* href; */
    xmlSecTransformUsageDigestMethod,           /* xmlSecTransformUsage usage; */

    /* methods */
    xmlSecNssDigestInitialize,                  /* xmlSecTransformInitializeMethod initialize; */
    xmlSecNssDigestFinalize,                    /* xmlSecTransformFinalizeMethod finalize; */
    NULL,                                       /* xmlSecTransformNodeReadMethod readNode; */
    NULL,                                       /* xmlSecTransformNodeWriteMethod writeNode; */
    NULL,                                       /* xmlSecTransformSetKeyReqMethod setKeyReq; */
    NULL,                                       /* xmlSecTransformSetKeyMethod setKey; */
    xmlSecNssDigestVerify,                      /* xmlSecTransformVerifyMethod verify; */
    xmlSecTransformDefaultGetDataType,          /* xmlSecTransformGetDataTypeMethod getDataType; */
    xmlSecTransformDefaultPushBin,              /* xmlSecTransformPushBinMethod pushBin; */
    xmlSecTransformDefaultPopBin,               /* xmlSecTransformPopBinMethod popBin; */
    NULL,                                       /* xmlSecTransformPushXmlMethod pushXml; */
    NULL,                                       /* xmlSecTransformPopXmlMethod popXml; */
    xmlSecNssDigestExecute,                     /* xmlSecTransformExecuteMethod execute; */

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

/**
 * xmlSecNssTransformMd5GetKlass:
 *
 * MD5 digest transform klass.
 *
 * Returns: pointer to MD5 digest transform klass.
 */
xmlSecTransformId
xmlSecNssTransformMd5GetKlass(void) {
    return(&xmlSecNssMd5Klass);
}
#endif /* XMLSEC_NO_MD5 */


#ifndef XMLSEC_NO_SHA1
/******************************************************************************
 *
 * SHA1 Digest transforms
 *
 *****************************************************************************/
static xmlSecTransformKlass xmlSecNssSha1Klass = {
    /* klass/object sizes */
    sizeof(xmlSecTransformKlass),               /* xmlSecSize klassSize */
    xmlSecNssDigestSize,                        /* xmlSecSize objSize */

    /* data */
    xmlSecNameSha1,                             /* const xmlChar* name; */
    xmlSecHrefSha1,                             /* const xmlChar* href; */
    xmlSecTransformUsageDigestMethod,           /* xmlSecTransformUsage usage; */

    /* methods */
    xmlSecNssDigestInitialize,                  /* xmlSecTransformInitializeMethod initialize; */
    xmlSecNssDigestFinalize,                    /* xmlSecTransformFinalizeMethod finalize; */
    NULL,                                       /* xmlSecTransformNodeReadMethod readNode; */
    NULL,                                       /* xmlSecTransformNodeWriteMethod writeNode; */
    NULL,                                       /* xmlSecTransformSetKeyReqMethod setKeyReq; */
    NULL,                                       /* xmlSecTransformSetKeyMethod setKey; */
    xmlSecNssDigestVerify,                      /* xmlSecTransformVerifyMethod verify; */
    xmlSecTransformDefaultGetDataType,          /* xmlSecTransformGetDataTypeMethod getDataType; */
    xmlSecTransformDefaultPushBin,              /* xmlSecTransformPushBinMethod pushBin; */
    xmlSecTransformDefaultPopBin,               /* xmlSecTransformPopBinMethod popBin; */
    NULL,                                       /* xmlSecTransformPushXmlMethod pushXml; */
    NULL,                                       /* xmlSecTransformPopXmlMethod popXml; */
    xmlSecNssDigestExecute,                     /* xmlSecTransformExecuteMethod execute; */

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

/**
 * xmlSecNssTransformSha1GetKlass:
 *
 * SHA-1 digest transform klass.
 *
 * Returns: pointer to SHA-1 digest transform klass.
 */
xmlSecTransformId
xmlSecNssTransformSha1GetKlass(void) {
    return(&xmlSecNssSha1Klass);
}
#endif /* XMLSEC_NO_SHA1 */


#ifndef XMLSEC_NO_SHA256
/******************************************************************************
 *
 * SHA256 Digest transforms
 *
 *****************************************************************************/
static xmlSecTransformKlass xmlSecNssSha256Klass = {
    /* klass/object sizes */
    sizeof(xmlSecTransformKlass),               /* xmlSecSize klassSize */
    xmlSecNssDigestSize,                        /* xmlSecSize objSize */

    /* data */
    xmlSecNameSha256,                           /* const xmlChar* name; */
    xmlSecHrefSha256,                           /* const xmlChar* href; */
    xmlSecTransformUsageDigestMethod,           /* xmlSecTransformUsage usage; */

    /* methods */
    xmlSecNssDigestInitialize,                  /* xmlSecTransformInitializeMethod initialize; */
    xmlSecNssDigestFinalize,                    /* xmlSecTransformFinalizeMethod finalize; */
    NULL,                                       /* xmlSecTransformNodeReadMethod readNode; */
    NULL,                                       /* xmlSecTransformNodeWriteMethod writeNode; */
    NULL,                                       /* xmlSecTransformSetKeyReqMethod setKeyReq; */
    NULL,                                       /* xmlSecTransformSetKeyMethod setKey; */
    xmlSecNssDigestVerify,                      /* xmlSecTransformVerifyMethod verify; */
    xmlSecTransformDefaultGetDataType,          /* xmlSecTransformGetDataTypeMethod getDataType; */
    xmlSecTransformDefaultPushBin,              /* xmlSecTransformPushBinMethod pushBin; */
    xmlSecTransformDefaultPopBin,               /* xmlSecTransformPopBinMethod popBin; */
    NULL,                                       /* xmlSecTransformPushXmlMethod pushXml; */
    NULL,                                       /* xmlSecTransformPopXmlMethod popXml; */
    xmlSecNssDigestExecute,                     /* xmlSecTransformExecuteMethod execute; */

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

/**
 * xmlSecNssTransformSha256GetKlass:
 *
 * SHA256 digest transform klass.
 *
 * Returns: pointer to SHA256 digest transform klass.
 */
xmlSecTransformId
xmlSecNssTransformSha256GetKlass(void) {
    return(&xmlSecNssSha256Klass);
}
#endif /* XMLSEC_NO_SHA256 */


#ifndef XMLSEC_NO_SHA384
/******************************************************************************
 *
 * SHA384 Digest transforms
 *
 *****************************************************************************/
static xmlSecTransformKlass xmlSecNssSha384Klass = {
    /* klass/object sizes */
    sizeof(xmlSecTransformKlass),               /* xmlSecSize klassSize */
    xmlSecNssDigestSize,                        /* xmlSecSize objSize */

    /* data */
    xmlSecNameSha384,                           /* const xmlChar* name; */
    xmlSecHrefSha384,                           /* const xmlChar* href; */
    xmlSecTransformUsageDigestMethod,           /* xmlSecTransformUsage usage; */

    /* methods */
    xmlSecNssDigestInitialize,                  /* xmlSecTransformInitializeMethod initialize; */
    xmlSecNssDigestFinalize,                    /* xmlSecTransformFinalizeMethod finalize; */
    NULL,                                       /* xmlSecTransformNodeReadMethod readNode; */
    NULL,                                       /* xmlSecTransformNodeWriteMethod writeNode; */
    NULL,                                       /* xmlSecTransformSetKeyReqMethod setKeyReq; */
    NULL,                                       /* xmlSecTransformSetKeyMethod setKey; */
    xmlSecNssDigestVerify,                      /* xmlSecTransformVerifyMethod verify; */
    xmlSecTransformDefaultGetDataType,          /* xmlSecTransformGetDataTypeMethod getDataType; */
    xmlSecTransformDefaultPushBin,              /* xmlSecTransformPushBinMethod pushBin; */
    xmlSecTransformDefaultPopBin,               /* xmlSecTransformPopBinMethod popBin; */
    NULL,                                       /* xmlSecTransformPushXmlMethod pushXml; */
    NULL,                                       /* xmlSecTransformPopXmlMethod popXml; */
    xmlSecNssDigestExecute,                     /* xmlSecTransformExecuteMethod execute; */

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

/**
 * xmlSecNssTransformSha384GetKlass:
 *
 * SHA384 digest transform klass.
 *
 * Returns: pointer to SHA384 digest transform klass.
 */
xmlSecTransformId
xmlSecNssTransformSha384GetKlass(void) {
    return(&xmlSecNssSha384Klass);
}
#endif /* XMLSEC_NO_SHA384 */

#ifndef XMLSEC_NO_SHA512
/******************************************************************************
 *
 * SHA512 Digest transforms
 *
 *****************************************************************************/
static xmlSecTransformKlass xmlSecNssSha512Klass = {
    /* klass/object sizes */
    sizeof(xmlSecTransformKlass),               /* xmlSecSize klassSize */
    xmlSecNssDigestSize,                        /* xmlSecSize objSize */

    /* data */
    xmlSecNameSha512,                           /* const xmlChar* name; */
    xmlSecHrefSha512,                           /* const xmlChar* href; */
    xmlSecTransformUsageDigestMethod,           /* xmlSecTransformUsage usage; */

    /* methods */
    xmlSecNssDigestInitialize,                  /* xmlSecTransformInitializeMethod initialize; */
    xmlSecNssDigestFinalize,                    /* xmlSecTransformFinalizeMethod finalize; */
    NULL,                                       /* xmlSecTransformNodeReadMethod readNode; */
    NULL,                                       /* xmlSecTransformNodeWriteMethod writeNode; */
    NULL,                                       /* xmlSecTransformSetKeyReqMethod setKeyReq; */
    NULL,                                       /* xmlSecTransformSetKeyMethod setKey; */
    xmlSecNssDigestVerify,                      /* xmlSecTransformVerifyMethod verify; */
    xmlSecTransformDefaultGetDataType,          /* xmlSecTransformGetDataTypeMethod getDataType; */
    xmlSecTransformDefaultPushBin,              /* xmlSecTransformPushBinMethod pushBin; */
    xmlSecTransformDefaultPopBin,               /* xmlSecTransformPopBinMethod popBin; */
    NULL,                                       /* xmlSecTransformPushXmlMethod pushXml; */
    NULL,                                       /* xmlSecTransformPopXmlMethod popXml; */
    xmlSecNssDigestExecute,                     /* xmlSecTransformExecuteMethod execute; */

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

/**
 * xmlSecNssTransformSha512GetKlass:
 *
 * SHA512 digest transform klass.
 *
 * Returns: pointer to SHA512 digest transform klass.
 */
xmlSecTransformId
xmlSecNssTransformSha512GetKlass(void) {
    return(&xmlSecNssSha512Klass);
}
#endif /* XMLSEC_NO_SHA512 */

