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/**
* 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>
*/
#include "globals.h"
#include <string.h>
#include <gnutls/gnutls.h>
#include <gcrypt.h>
#include <xmlsec/xmlsec.h>
#include <xmlsec/keys.h>
#include <xmlsec/transforms.h>
#include <xmlsec/errors.h>
#include <xmlsec/gnutls/app.h>
#include <xmlsec/gnutls/crypto.h>
#define XMLSEC_GNUTLS_MAX_DIGEST_SIZE 32
/**************************************************************************
*
* Internal GNUTLS Digest CTX
*
*****************************************************************************/
typedef struct _xmlSecGnuTLSDigestCtx xmlSecGnuTLSDigestCtx, *xmlSecGnuTLSDigestCtxPtr;
struct _xmlSecGnuTLSDigestCtx {
int digest;
GcryMDHd digestCtx;
xmlSecByte dgst[XMLSEC_GNUTLS_MAX_DIGEST_SIZE];
xmlSecSize dgstSize; /* dgst size in bytes */
};
/******************************************************************************
*
* Digest transforms
*
* xmlSecGnuTLSDigestCtx is located after xmlSecTransform
*
*****************************************************************************/
#define xmlSecGnuTLSDigestSize \
(sizeof(xmlSecTransform) + sizeof(xmlSecGnuTLSDigestCtx))
#define xmlSecGnuTLSDigestGetCtx(transform) \
((xmlSecGnuTLSDigestCtxPtr)(((xmlSecByte*)(transform)) + sizeof(xmlSecTransform)))
static int xmlSecGnuTLSDigestInitialize (xmlSecTransformPtr transform);
static void xmlSecGnuTLSDigestFinalize (xmlSecTransformPtr transform);
static int xmlSecGnuTLSDigestVerify (xmlSecTransformPtr transform,
const xmlSecByte* data,
xmlSecSize dataSize,
xmlSecTransformCtxPtr transformCtx);
static int xmlSecGnuTLSDigestExecute (xmlSecTransformPtr transform,
int last,
xmlSecTransformCtxPtr transformCtx);
static int xmlSecGnuTLSDigestCheckId (xmlSecTransformPtr transform);
static int
xmlSecGnuTLSDigestCheckId(xmlSecTransformPtr transform) {
#ifndef XMLSEC_NO_SHA1
if(xmlSecTransformCheckId(transform, xmlSecGnuTLSTransformSha1Id)) {
return(1);
}
#endif /* XMLSEC_NO_SHA1 */
return(0);
}
static int
xmlSecGnuTLSDigestInitialize(xmlSecTransformPtr transform) {
xmlSecGnuTLSDigestCtxPtr ctx;
#ifndef XMLSEC_GNUTLS_OLD
gpg_err_code_t ret;
#endif /* XMLSEC_GNUTLS_OLD */
xmlSecAssert2(xmlSecGnuTLSDigestCheckId(transform), -1);
xmlSecAssert2(xmlSecTransformCheckSize(transform, xmlSecGnuTLSDigestSize), -1);
ctx = xmlSecGnuTLSDigestGetCtx(transform);
xmlSecAssert2(ctx != NULL, -1);
/* initialize context */
memset(ctx, 0, sizeof(xmlSecGnuTLSDigestCtx));
#ifndef XMLSEC_NO_SHA1
if(xmlSecTransformCheckId(transform, xmlSecGnuTLSTransformSha1Id)) {
ctx->digest = GCRY_MD_SHA1;
} else
#endif /* XMLSEC_NO_SHA1 */
if(1) {
xmlSecError(XMLSEC_ERRORS_HERE,
xmlSecErrorsSafeString(xmlSecTransformGetName(transform)),
NULL,
XMLSEC_ERRORS_R_INVALID_TRANSFORM,
XMLSEC_ERRORS_NO_MESSAGE);
return(-1);
}
#ifndef XMLSEC_GNUTLS_OLD
ret = gcry_md_open(&ctx->digestCtx, ctx->digest, GCRY_MD_FLAG_SECURE); /* we are paranoid */
if(ret != GPG_ERR_NO_ERROR) {
#else /* XMLSEC_GNUTLS_OLD */
ctx->digestCtx = gcry_md_open(ctx->digest, GCRY_MD_FLAG_SECURE); /* we are paranoid */
if(ctx->digestCtx == NULL) {
#endif /* XMLSEC_GNUTLS_OLD */
xmlSecError(XMLSEC_ERRORS_HERE,
xmlSecErrorsSafeString(xmlSecTransformGetName(transform)),
"gcry_md_open",
XMLSEC_ERRORS_R_CRYPTO_FAILED,
XMLSEC_ERRORS_NO_MESSAGE);
return(-1);
}
return(0);
}
static void
xmlSecGnuTLSDigestFinalize(xmlSecTransformPtr transform) {
xmlSecGnuTLSDigestCtxPtr ctx;
xmlSecAssert(xmlSecGnuTLSDigestCheckId(transform));
xmlSecAssert(xmlSecTransformCheckSize(transform, xmlSecGnuTLSDigestSize));
ctx = xmlSecGnuTLSDigestGetCtx(transform);
xmlSecAssert(ctx != NULL);
if(ctx->digestCtx != NULL) {
gcry_md_close(ctx->digestCtx);
}
memset(ctx, 0, sizeof(xmlSecGnuTLSDigestCtx));
}
static int
xmlSecGnuTLSDigestVerify(xmlSecTransformPtr transform,
const xmlSecByte* data, xmlSecSize dataSize,
xmlSecTransformCtxPtr transformCtx) {
xmlSecGnuTLSDigestCtxPtr ctx;
xmlSecAssert2(xmlSecGnuTLSDigestCheckId(transform), -1);
xmlSecAssert2(transform->operation == xmlSecTransformOperationVerify, -1);
xmlSecAssert2(xmlSecTransformCheckSize(transform, xmlSecGnuTLSDigestSize), -1);
xmlSecAssert2(transform->status == xmlSecTransformStatusFinished, -1);
xmlSecAssert2(data != NULL, -1);
xmlSecAssert2(transformCtx != NULL, -1);
ctx = xmlSecGnuTLSDigestGetCtx(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
xmlSecGnuTLSDigestExecute(xmlSecTransformPtr transform, int last, xmlSecTransformCtxPtr transformCtx) {
xmlSecGnuTLSDigestCtxPtr ctx;
xmlSecBufferPtr in, out;
int ret;
xmlSecAssert2(xmlSecGnuTLSDigestCheckId(transform), -1);
xmlSecAssert2((transform->operation == xmlSecTransformOperationSign) || (transform->operation == xmlSecTransformOperationVerify), -1);
xmlSecAssert2(transformCtx != NULL, -1);
xmlSecAssert2(xmlSecTransformCheckSize(transform, xmlSecGnuTLSDigestSize), -1);
ctx = xmlSecGnuTLSDigestGetCtx(transform);
xmlSecAssert2(ctx != NULL, -1);
xmlSecAssert2(ctx->digest != GCRY_MD_NONE, -1);
xmlSecAssert2(ctx->digestCtx != NULL, -1);
in = &(transform->inBuf);
out = &(transform->outBuf);
if(transform->status == xmlSecTransformStatusNone) {
transform->status = xmlSecTransformStatusWorking;
}
if(transform->status == xmlSecTransformStatusWorking) {
xmlSecSize inSize;
inSize = xmlSecBufferGetSize(in);
if(inSize > 0) {
gcry_md_write(ctx->digestCtx, xmlSecBufferGetData(in), inSize);
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) {
xmlSecByte* buf;
/* get the final digest */
gcry_md_final(ctx->digestCtx);
buf = gcry_md_read(ctx->digestCtx, ctx->digest);
if(buf == NULL) {
xmlSecError(XMLSEC_ERRORS_HERE,
xmlSecErrorsSafeString(xmlSecTransformGetName(transform)),
"gcry_md_read",
XMLSEC_ERRORS_R_CRYPTO_FAILED,
XMLSEC_ERRORS_NO_MESSAGE);
return(-1);
}
/* copy it to our internal buffer */
ctx->dgstSize = gcry_md_get_algo_dlen(ctx->digest);
xmlSecAssert2(ctx->dgstSize > 0, -1);
xmlSecAssert2(ctx->dgstSize <= sizeof(ctx->dgst), -1);
memcpy(ctx->dgst, buf, ctx->dgstSize);
/* and to the output if needed */
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_SHA1
/******************************************************************************
*
* SHA1 Digest transforms
*
*****************************************************************************/
static xmlSecTransformKlass xmlSecGnuTLSSha1Klass = {
/* klass/object sizes */
sizeof(xmlSecTransformKlass), /* xmlSecSize klassSize */
xmlSecGnuTLSDigestSize, /* xmlSecSize objSize */
/* data */
xmlSecNameSha1, /* const xmlChar* name; */
xmlSecHrefSha1, /* const xmlChar* href; */
xmlSecTransformUsageDigestMethod, /* xmlSecTransformUsage usage; */
/* methods */
xmlSecGnuTLSDigestInitialize, /* xmlSecTransformInitializeMethod initialize; */
xmlSecGnuTLSDigestFinalize, /* xmlSecTransformFinalizeMethod finalize; */
NULL, /* xmlSecTransformNodeReadMethod readNode; */
NULL, /* xmlSecTransformNodeWriteMethod writeNode; */
NULL, /* xmlSecTransformSetKeyReqMethod setKeyReq; */
NULL, /* xmlSecTransformSetKeyMethod setKey; */
xmlSecGnuTLSDigestVerify, /* xmlSecTransformVerifyMethod verify; */
xmlSecTransformDefaultGetDataType, /* xmlSecTransformGetDataTypeMethod getDataType; */
xmlSecTransformDefaultPushBin, /* xmlSecTransformPushBinMethod pushBin; */
xmlSecTransformDefaultPopBin, /* xmlSecTransformPopBinMethod popBin; */
NULL, /* xmlSecTransformPushXmlMethod pushXml; */
NULL, /* xmlSecTransformPopXmlMethod popXml; */
xmlSecGnuTLSDigestExecute, /* xmlSecTransformExecuteMethod execute; */
NULL, /* void* reserved0; */
NULL, /* void* reserved1; */
};
/**
* xmlSecGnuTLSTransformSha1GetKlass:
*
* SHA-1 digest transform klass.
*
* Returns: pointer to SHA-1 digest transform klass.
*/
xmlSecTransformId
xmlSecGnuTLSTransformSha1GetKlass(void) {
return(&xmlSecGnuTLSSha1Klass);
}
#endif /* XMLSEC_NO_SHA1 */
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