I have a string "NNNCCCXXXX" for example. I will need to change one of these characters to B so for example if I needed to change Char 3 I would want to have "NNBCCCXXXX" I will know the char I need to change and the current string.
Is there a command that sets a variable length?
I have a input of a variable length field but my output for that field needs to be set to 32 char.
Is there such a command?
I am on a sun box running ksh
Thanks (2 Replies)
Hi,
I know, particular value in the variable should always be of lenth 7 , but the value that is present in thevariable might be of any no.of characters less than or equal to 7... if the no.of characters in the variable is less than 7, I want to add, zeroes at the starting of the field.. How can... (3 Replies)
how we can replace char with a string
example
char *a="a.s"
so finally
what i ant to do
raplace a with ant and s sree
so in my array a i want to store the value as "ant.sree"
thank u in advance (1 Reply)
I have a customer who logged some cc and bank account numbers in their apache logs. I got the cc numbers x'd out with
sed -e 's/args=\{16\}/args=XXXXXXXXXXXXXXXX/g' -e 's/cardnum=\{16\}/cardnum=XXXXXXXXXXXXXXXX/g'but that wasn't too difficult due to the value being 16 digits.
The bank account... (7 Replies)
Hi All
I want to take a Hexadecimal number as input and i want to find lenth of the input and pass it to char s ( char s ). I have a program to convert hexadecial to binary but it is taking limited input but i want to return binary number based on input. How? (1 Reply)
I have a string like
Months=jan feb mar april x y ..
Here the number of fields in Months is not definite
I need to extract each field in the Months string and pass it to awk . Don't want to use for in since it is a loop . How can i do it (2 Replies)
Hi All,
I have a file which is like below. I need to read all the patterns that starts with P and then replace the 9 digit values to 8 digit values (remove leading integer). Can you please help
Example : ( Please look below File)
File :
P,1
M1,... (7 Replies)
My sample file is variable length, with out any field delimiters. It has min of 18 chars length and the 'CRLF' is potentially between 12-14 chars. How do I replace this with a space? I still want to keep end of record, but just want to remove these new lines chars in the middle of the data.
... (7 Replies)
Discussion started by: chandrath
7 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)