Hi Gurus,
I wrote a small KSH script, in that i am comparing two variables like this
curr_time = date +%h.%m
set_time=23.55
If ];
then
zip the file
fi
The above script is croned to run evey 5(3,8,.......,58) minutes, but it is zipping at 23.03 hours. My intention is at 23.58 .what... (4 Replies)
Hi !
How to reset a variable to 0 after a reset value, say 10 using bitwise
XOR.
For example,
int cnt=0;
if(cnt<10)
cnt++;
else
cnt = 0;
How can we achieve this by using XOR only.
thanks, (1 Reply)
Hi,
I am trying to reverse a string using the following program utilizing the Exclusive OR bit operation:
int main() {
char str = "Quraish";
char *p = str, temp;
char *q = str + strlen(str) - 1;
while ( p != q ) {
if (*p != *q) {
*p ^= *q; *q ^= *p; *p ^= *q;... (1 Reply)
Hi,
I'm trying to work on the script given below
#!/bin/ksh -x
pfile()
{
echo "$1"
}
touch smp19
echo "Hi" > smp19
result=$(pfile $smp19)
echo $result
As highlighted , when i pass $smp19 as parameter ,it does not display the output.However when i try giving "Hi" instead... (2 Replies)
Hi there,
I want to compare 2nd column which are alphanumeric values from each of the 2 files i.e.,lspv_pre.out and lspv_post.out , if found echo some message.
lspv_pre.out
hdisk0 00c39eaa451144dd rootvg active
hdisk1 00c39eaa45223322 ... (3 Replies)
I am aware of truth table for XOR between binary values .
Out of curious in would like to know how XOR works between 2 strings which contain alphabets .
For example A ^ B
How it works internally?
Please help me to understand this
Thanks (1 Reply)
The purpose of this article is revealing the unrevealed parts of the bitwise XOR.
As we aware, the truth table for the XOR operator is :
A B A^B
0 0 0
0 1 1
1 0 1
1 1 0
For example , 1^2 will be calculated as given below:
First the operands... (1 Reply)
hi,
i am new to shell programming, can u please tell me how to perform XOr operation of two strings.
i tried to do xor using ^symbol but this doesnt work.
help me with this
Thanks (12 Replies)
Discussion started by: anil_uvce
12 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)