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Comment:Code Cleanup to use switch statements
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SHA3-256: 24e26c8844c8ad79ccffa1fd30d5c2c596cebca204845eb8505aa40ddb40f94e
User & Date: bohagan on 2023-11-27 02:39:19
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Context
2023-12-02
04:25
Added function to encrypt and decrypt data check-in: b395f93924 user: bohagan tags: crypto
2023-11-27
02:39
Code Cleanup to use switch statements check-in: 24e26c8844 user: bohagan tags: crypto
2023-11-26
02:15
Split doc file into TLS and cryptography files. Moved digest functions to cryptography.html doc file. Added schema file from TCL man pages. Updated TLS doc file. check-in: b5b7a4964e user: bohagan tags: crypto
Changes
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Modified generic/tlsDigest.c from [83013db897] to [995b6c10f9].

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	int flags;		/* Chan config flags */
	int watchMask;		/* Current WatchProc mask */
	int mode;		/* Current mode of parent channel */
	int format;		/* Digest format and operation */

	Tcl_Interp *interp;	/* Current interpreter */
	EVP_MD_CTX *ctx;	/* MD Context */
	HMAC_CTX *hctx;		/* HMAC Context */
	CMAC_CTX *cctx;		/* CMAC Context */
	Tcl_Command token;	/* Command token */
} DigestState;

/*
 *-------------------------------------------------------------------
 *
 * DigestStateNew --








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	int flags;		/* Chan config flags */
	int watchMask;		/* Current WatchProc mask */
	int mode;		/* Current mode of parent channel */
	int format;		/* Digest format and operation */

	Tcl_Interp *interp;	/* Current interpreter */
	EVP_MD_CTX *ctx;	/* MD Context */
	HMAC_CTX *hctx;		/* HMAC context */
	CMAC_CTX *cctx;		/* CMAC context */
	Tcl_Command token;	/* Command token */
} DigestState;

/*
 *-------------------------------------------------------------------
 *
 * DigestStateNew --
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 *-------------------------------------------------------------------
 */
int DigestInitialize(Tcl_Interp *interp, DigestState *statePtr, const EVP_MD *md,
	const EVP_CIPHER *cipher, Tcl_Obj *keyObj, EVP_MAC *mac) {
    int key_len = 0, res = 0;
    const unsigned char *key = NULL;

    /* Create message digest context */
    if (statePtr->format & TYPE_MD) {

	statePtr->ctx = EVP_MD_CTX_new();
	res = (statePtr->ctx != NULL);

    } else if (statePtr->format & TYPE_HMAC) {
	statePtr->hctx = HMAC_CTX_new();
	res = (statePtr->hctx != NULL);

    } else if (statePtr->format & TYPE_CMAC) {
	statePtr->cctx = CMAC_CTX_new();
	res = (statePtr->cctx != NULL);

    }

    if (!res) {
	Tcl_AppendResult(interp, "Create context failed: ", REASON(), NULL);
	return TCL_ERROR;
    }

    /* Get key */
    if (keyObj != NULL) {
	key = Tcl_GetByteArrayFromObj(keyObj, &key_len);
    }

    /* Initialize hash function */
    if (statePtr->format & TYPE_MD) {

	res = EVP_DigestInit_ex(statePtr->ctx, md, NULL);

    } else if (statePtr->format & TYPE_HMAC) {
	res = HMAC_Init_ex(statePtr->hctx, (const void *) key, key_len, md, NULL);

    } else if (statePtr->format & TYPE_CMAC) {
	res = CMAC_Init(statePtr->cctx, (const void *) key, key_len, cipher, NULL);

    }

    if (!res) {
	Tcl_AppendResult(interp, "Initialize failed: ", REASON(), NULL);
	return TCL_ERROR;
    }
    return TCL_OK;
}









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 *-------------------------------------------------------------------
 */
int DigestInitialize(Tcl_Interp *interp, DigestState *statePtr, const EVP_MD *md,
	const EVP_CIPHER *cipher, Tcl_Obj *keyObj, EVP_MAC *mac) {
    int key_len = 0, res = 0;
    const unsigned char *key = NULL;

    /* Create contexts */
    switch(statePtr->format & 0xFF0) {
    case TYPE_MD:
	statePtr->ctx = EVP_MD_CTX_new();
	res = (statePtr->ctx != NULL);
	break;
    case TYPE_HMAC:
	statePtr->hctx = HMAC_CTX_new();
	res = (statePtr->hctx != NULL);
	break;
    case TYPE_CMAC:
	statePtr->cctx = CMAC_CTX_new();
	res = (statePtr->cctx != NULL);
	break;
    }

    if (!res) {
	Tcl_AppendResult(interp, "Create context failed: ", REASON(), NULL);
	return TCL_ERROR;
    }

    /* Get key */
    if (keyObj != NULL) {
	key = Tcl_GetByteArrayFromObj(keyObj, &key_len);
    }

    /* Initialize cryptography function */
    switch(statePtr->format & 0xFF0) {
    case TYPE_MD:
	res = EVP_DigestInit_ex(statePtr->ctx, md, NULL);
	break;
    case TYPE_HMAC:
	res = HMAC_Init_ex(statePtr->hctx, (const void *) key, key_len, md, NULL);
	break;
    case TYPE_CMAC:
	res = CMAC_Init(statePtr->cctx, (const void *) key, key_len, cipher, NULL);
	break;
    }

    if (!res) {
	Tcl_AppendResult(interp, "Initialize failed: ", REASON(), NULL);
	return TCL_ERROR;
    }
    return TCL_OK;
}
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 *	Adds buf data to hash function or sets result to error message
 *
 *-------------------------------------------------------------------
 */
int DigestUpdate(DigestState *statePtr, char *buf, size_t read, int do_result) {
    int res = 0;

    if (statePtr->format & TYPE_MD) {

	res = EVP_DigestUpdate(statePtr->ctx, buf, read);

    } else if (statePtr->format & TYPE_HMAC) {
	res = HMAC_Update(statePtr->hctx, buf, read);

    } else if (statePtr->format & TYPE_CMAC) {
	res = CMAC_Update(statePtr->cctx, buf, read);

    }

    if (!res && do_result) {
	Tcl_AppendResult(statePtr->interp, "Update failed: ", REASON(), NULL);
	return TCL_ERROR;
    }
    return res;
}









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 *	Adds buf data to hash function or sets result to error message
 *
 *-------------------------------------------------------------------
 */
int DigestUpdate(DigestState *statePtr, char *buf, size_t read, int do_result) {
    int res = 0;

    switch(statePtr->format & 0xFF0) {
    case TYPE_MD:
        res = EVP_DigestUpdate(statePtr->ctx, buf, read);
	break;
    case TYPE_HMAC:
        res = HMAC_Update(statePtr->hctx, buf, read);
	break;
    case TYPE_CMAC:
        res = CMAC_Update(statePtr->cctx, buf, read);
	break;
    }

    if (!res && do_result) {
	Tcl_AppendResult(statePtr->interp, "Update failed: ", REASON(), NULL);
	return TCL_ERROR;
    }
    return res;
}
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 * Side effects:
 *	Sets result to message digest or an error message.
 *
 *-------------------------------------------------------------------
 */
int DigestFinalize(Tcl_Interp *interp, DigestState *statePtr, Tcl_Obj **resultObj) {
    unsigned char md_buf[EVP_MAX_MD_SIZE];
    unsigned int md_len;
    int res = 0;

    /* Finalize hash function and calculate message digest */
    if (statePtr->format & TYPE_MD) {

	if (!(statePtr->format & IS_XOF)) {
	    res = EVP_DigestFinal_ex(statePtr->ctx, md_buf, &md_len);

	} else {
	    res = EVP_DigestFinalXOF(statePtr->ctx, md_buf, EVP_MAX_MD_SIZE);

	}

    } else if (statePtr->format & TYPE_HMAC) {
	res = HMAC_Final(statePtr->hctx, md_buf, &md_len);


    } else if (statePtr->format & TYPE_CMAC) {
	size_t len;
	res = CMAC_Final(statePtr->cctx, md_buf, &len);
	md_len = (unsigned int) len;

    }

    if (!res) {
	if (resultObj == NULL) {
	    Tcl_AppendResult(interp, "Finalize failed: ", REASON(), NULL);
	}
	return TCL_ERROR;








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 * Side effects:
 *	Sets result to message digest or an error message.
 *
 *-------------------------------------------------------------------
 */
int DigestFinalize(Tcl_Interp *interp, DigestState *statePtr, Tcl_Obj **resultObj) {
    unsigned char md_buf[EVP_MAX_MD_SIZE];
    unsigned int ulen;
    int res = 0, md_len = 0;

    /* Finalize cryptography function and get result */
    switch(statePtr->format & 0xFF0) {
    case TYPE_MD:
	if (!(statePtr->format & IS_XOF)) {
	    res = EVP_DigestFinal_ex(statePtr->ctx, md_buf, &ulen);
	    md_len = (int) ulen;
	} else {
	    res = EVP_DigestFinalXOF(statePtr->ctx, md_buf, (size_t) EVP_MAX_MD_SIZE);
	    md_len = EVP_MAX_MD_SIZE;
	}
	break;
    case TYPE_HMAC:
	res = HMAC_Final(statePtr->hctx, md_buf, &ulen);
	md_len = (int) ulen;
	break;
    case TYPE_CMAC:
	size_t size;
	res = CMAC_Final(statePtr->cctx, md_buf, &size);
	md_len = (int) size;
	break;
    }

    if (!res) {
	if (resultObj == NULL) {
	    Tcl_AppendResult(interp, "Finalize failed: ", REASON(), NULL);
	}
	return TCL_ERROR;
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	    Tcl_IncrRefCount(*resultObj);
	}

    } else {
	Tcl_Obj *newObj = Tcl_NewObj();
	unsigned char *ptr = Tcl_SetByteArrayLength(newObj, md_len*2);

	for (unsigned int i = 0; i < md_len; i++) {
	    *ptr++ = hex[(md_buf[i] >> 4) & 0x0F];
	    *ptr++ = hex[md_buf[i] & 0x0F];
	}

	if (resultObj == NULL) {
	    Tcl_SetObjResult(interp, newObj);
	} else {








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	    Tcl_IncrRefCount(*resultObj);
	}

    } else {
	Tcl_Obj *newObj = Tcl_NewObj();
	unsigned char *ptr = Tcl_SetByteArrayLength(newObj, md_len*2);

	for (int i = 0; i < md_len; i++) {
	    *ptr++ = hex[(md_buf[i] >> 4) & 0x0F];
	    *ptr++ = hex[md_buf[i] & 0x0F];
	}

	if (resultObj == NULL) {
	    Tcl_SetObjResult(interp, newObj);
	} else {
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