Hi guys , i would want to count the concurrences of the 0A hex char in a text file , then if no matches i need to add a 0A at the end of the line.
Any ideas?
thx.Regards (1 Reply)
I have an RPM that I am trying to install and it keeps coming back with:
I know I could kill the bird by throwing a "yum install *perl*" at it, but this seems like hurling a skyscraper at an ant...
any better suggestions? (2 Replies)
Hi,
I have learned some of the Unix commands a way back and not sure of how to code them when needed in certain way, especially sed command. Here is my situation. I have an xml file with several tags. most of the tags start on the same line and end on the same line. However, data for some tags... (8 Replies)
Hi,
I have a non-ascii character (Ŵ), which can be represented in UTF-8 encoding as equivalent hex value (\xC5B4). Is there a function in unix to convert this hex value back to display the charcter ? (10 Replies)
Hello Can Any1 help me.
I want to replace a specific character string inside a file at a specific location with a particular character with the help of a command or a shell script.
The tr command replaces a specific character with another for all the occurences of that character in the file.
I... (5 Replies)
OK This one has me stumped. I have the following line,
program name - the program description that can also contain a hyphen - character.
I'm need to separate the "program name" from the program description.
I've tried using an array function with the - as delimiter, but I ran into a... (2 Replies)
Hi All,
My main intension of is to convert the Hexstring stored in a char* into hex and then prefixing it with "0x" and suffix it with ','
This has to be done for all the hexstring char* is NULL.
Store the result prefixed with "0x" and suffixed with ',' in another char* and pass it to... (1 Reply)
This might be a dummy question, but is there a command in UNIX that compare two strings character-by-character and display the difference?
---------- Post updated at 11:25 AM ---------- Previous update was at 10:32 AM ----------
Or probably what I'm looking is how to break a string into... (3 Replies)
Hi,
Is there really a difference between these two, std::hex and ios::hex??
I stumbled upon reading a line, "std::ios::hex is a bitmask (8 on gcc) and works with setf(). std::hex is the operator". Is this true?
Thanks (0 Replies)
Hello guys,
I'm trying to extract all the expressions between the following tags: <b></b> from a HTML file.
This is how it looks: big lines containing several dozens expressions (made of 1,2,3,4,6 or even 7 words) I would like to extract:
<b>bla ble</b>bla ble</td><tr valign="top"><td... (3 Replies)
Discussion started by: bobylapointe
3 Replies
LEARN ABOUT CENTOS
tpm_quote_tools
TPM QUOTE TOOLS(8) TPM QUOTE TOOLS(8)NAME
TPM Quote Tools
PROGRAMS
tpm_mkuuid, tpm_mkaik, tpm_loadkey, tpm_unloadkey, tpm_getpcrhash, tpm_updatepcrhash, tpm_getquote, tpm_verifyquote
DESCRIPTION
TPM Quote Tools is a collection of programs that provide support for TPM based attestation using the TPM quote operation.
A TPM contains a set of Platform Configuration Registers (PCRs). In a well configured machine, some of these registers are set to known
values during the boot up process or at other times. For example, a PCR might contain the hash of a boot loader in memory before it is
run.
The TPM quote operation is used to authoritatively verify the contents of a TPM's Platform Configuration Registers (PCRs). During provi-
sioning, a composite hash of a selected set of PCRs is computed. The TPM quote operation produces a composite hash that can be compared
with the one computed while provisioning.
To use the TPM quote operation, keys must be generated. During provisioning, an Attestation Identity Key (AIK) is generated for each TPM,
and the public part of the key is made available to entities that validate quotes.
The TPM quote operation returns signed data and a signature. The data that is signed contains the PCRs selected for the operation, the
composite hash for the selected PCRs, and a nonce provided as input, and used to prevent replay attacks. At provisioning time, the data
that is signed is stored, not just the composite hash. The signature is discarded.
An entity that wishes to evaluate a machine generates a nonce, and sends it along with the set of PCR used to generate the composite PCR
hash at provisioning time. For this use of the TPM quote operation, the signed data is ignored, and the signature returned is used to val-
idate the state of the TPM's PCRs. Given the signature, the evaluating entity replaces the nonce in the signed data generated at provi-
sioning time, and checks to see if the signature is valid for the data. If so, this check ensures the selected PCRs contain values that
match the ones measured during provisioning.
A typical scenario for an enterprise using these tools follows. The tools expect AIKs to be referenced via one enterprise-wide Universally
Unique Identifier (UUID). The program tpm_mkuuid creates one.
For each machine being checked, an AIK is created using tpm_mkaik. The key blob produced is bound to the UUID on its machine using
tpm_loadkey. The public key associated with the AIK is sent to the entities that verify quotes. Finally, the expected PCR composite hash
is obtained using tpm_getpcrhash. When the expected PCR values change, a new hash can be generated with tpm_updatepcrhash.
The program to obtain a quote, and thus measure the current state of the PCRs is tpm_getquote. The program that verifies the quote
describes the same PCR composite hash as was measured initially is tpm_verifyquote.
SEE ALSO tpm_mkuuid(8), tpm_mkaik(8), tpm_loadkey(8), tpm_unloadkey(8), tpm_getpcrhash(8), tpm_updatepcrhash(8), tpm_getquote(8), tpm_verifyquote(8)
Oct 2010 TPM QUOTE TOOLS(8)