algor | 数据结构与算法 py3 九章算法 | Learning library
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kandi X-RAY | algor Summary
数据结构与算法 py3 九章算法
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QUESTION
I'm lost in a twisty maze of openssl command line options, seemingly all alike...
A public datasheet from a chip company shows this public key for use in chip authentication with secp224r1: 048A9B380AF2EE1B98DC417FECC263F8449C7625CECE82D9B916C992DA209D68 422B81EC20B65A66B5102A61596AF3379200599316A00A1410
I have saved it do disk as ascii-hex and as binary. I cannot find the openssl magic spell to make it into a PEM public key for signature verification. These are my best failed attempts:
...ANSWER
Answered 2021-Apr-16 at 13:53The public key is given in uncompressed format: 0x04 + + .
A format for a public key suitable for verification with OpenSSL is X.509/SPKI. As far as I know, OpenSSL cannot convert between the two formats. But the conversion can easily be done manually.
The X509/SPKI format contains the uncompressed key at the end, the front part is identical for a certain curve e.g. secp224r1:
QUESTION
I am creating an app that tracks progress of tasks with progress bars. The idea is that I ask the user to input details about the task they have to complete( Client Name and Client Contact). Whenever you click the button to add a task, I should get the following.
The client name
The client contact
Progress bar
Increment button
However every time I run the code below I get the error
...ANSWER
Answered 2021-Feb-03 at 15:17Common mistake
QUESTION
I have an EC private key in DER form that I want to transform to PEM form. But I cant read the DER form.
The private key is generated as:
...ANSWER
Answered 2021-Feb-03 at 03:47The man page for openssl ec sheds some light on the behavior you have observed. It mentions
OpenSSL uses the private key format specified in 'SEC 1: Elliptic Curve Cryptography' (http://www.secg.org/). To convert an OpenSSL EC private key into the PKCS#8 private key format use the pkcs8 command.
You have used the commands to generate the PKCS#8 formatted keys but subsequently tried to use the openssl ec tool to read them in as the other (SEC 1) format. That is expected to fail. You should use the openssl pkey command for that instead:
QUESTION
Context:
I have a hydraulic erosion algorithm that needs to receive an array of droplet starting positions. I also already have a pattern replicating algorithm, so I only need a good pattern to replicate.
The Requirements:
I need an algorism that produces a set of n^2 entries in a set of format (x,y) or [index] that describe cells in an nxn grid (where n = 2^i where i is any positive integer).
- (as a set it means that every cell is mentioned in exactly one entry)
- The pattern [created by the algorism ] should contain zero to none clustering of "visited" cells at any stage.
- The cell (0,0) is as close to (n-1,n-1) as to (1,1), this relates to the definition of clustering
Note I was/am trying to find solutions through fractal-like patterns built through recursion, but at the time of writing this, my solution is a lookup table of a checkerboard pattern(list of black cells + list of white cells) (which is bad, but yields fewer artifacts than an ordered list)
C, C++, C#, Java implementations (if any) are preferred
SOLVED!!!, Look for my own reply.
...ANSWER
Answered 2020-Mar-13 at 20:46You can use a linear congruential generator to create an even distribution across your n×n space. For example, if you have a 64×64 grid, using a stride of 47 will create the pattern on the left below. (Run on jsbin) The cells are visited from light to dark.
That pattern does not cluster, but it is rather uniform. It uses a simple row-wide transformation where
QUESTION
I have a function defined below named algor, which is translated from MATLAB to R. In order to make the function faster, I am using the foreach construct for the first time. I have the complete function code below:
ANSWER
Answered 2019-Jun-07 at 17:44Try defining the .GlobalEnv variables within the foreach loop in every call.
QUESTION
I have a PEM formatted public key (received from an iOS device):
...ANSWER
Answered 2018-Nov-15 at 15:20Java's parser didn't fail, your public key is not an instance of an encoded SubjectPublicKeyInfo structure that Java's X509EncodedKeySpec is expecting. I haven't gone through the Bouncycastle routines to see why it succeeded, but PEMParser is designed to parse many different kinds of so-called "PEM" files.
A SubjectPublicKeyInfo is defined in RFC 5280 as:
QUESTION
i am trying to create OSRM Docker for 2 country so first instanaces I created this like
...ANSWER
Answered 2018-Nov-11 at 21:26The last port number in the docker run -p option is the port number inside the container that the server is listening on. This is usually fixed per image, and you probably want it to be 5000 in both cases
QUESTION
import pandas as pd
data = {'Score': ['Goal 0', 'Goal 1', 'Goal 2', 'Goal 3'],
'Goal 0': [0.97,0.02,0,0], 'Goal 1': [0.01,0,0,0],
'Goal 2': [0,0,0,0], 'Goal 3': [0,0,0,0]}
# T1 = 0.02, T2 = 0.01, N = 0.97
df = pd.DataFrame(data, columns = ['Score', 'Goal 0', 'Goal 1', 'Goal 2', 'Goal 3'])
v = df.drop('Score', axis=1).as_matrix()
***for k = 0,1, 2, 3, 4. i=1,2,3,4. j=1,2,3,4.
v^0 = ([[0.97, 0.01, 0. , 0. ],
[0.02, 0 , 0. , 0. ],
[0. , 0. , 0. , 0. ],
[0. , 0. , 0. , 0. ]]).
if i==1: v^k[i,j] = ((v^(k-1)[i, j-1]) * T2)
if j==1: v^k[i,j] = ((v^(k-1)[i-1, j]) * T1)
otherwise v^k[i,j] = (((v^(k-1)[i-1, j]) * T1) + ((v^(k-1)[i, j-1]) * T2) + ((v^(k-1)[i, j]) * N)). ***
ANSWER
Answered 2018-Apr-23 at 19:35To complement my comment above, you can find a minimalistic/silly example of how to use a temporary variable in your calculations below:
QUESTION
I am trying to generate a 2048 bit RSA Private Key that is encrypted with a AES256CBC cipher while in FIPS mode. I am using OpenSSL 1.0.2l here. I tried the latest 1.0.2 snapshot and that isn't making any difference.
My problem is that PEM_write_bio_RSAPrivateKey does not return 1 and I get this error:
...ANSWER
Answered 2017-Dec-14 at 15:08OK so I figured this out after thinking about the errors more and spotting this:
https://wiki.openssl.org/index.php/Manual:OpenSSL_add_all_algorithms(3)
If I call OpenSSL_add_all_algorithms() after I call FIPS_mode_set(1) then PEM_write_bio_RSAPrivateKey works. That is, this does not throw an error:
QUESTION
I'm student studying clustering. I know that k-medoid algorism use absolute-error criterion, but I can't understand why not use squared-error criterion like k-means algorism. Is there any advantage using absolute-error criterion instead of squared-error criterion?
...ANSWER
Answered 2017-Aug-01 at 18:41The mean is a least squares (L2) estimator.
The median is an L1 estimator.
Hence, k-medoids also uses L1, whereas k-means uses L2.
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Install algor
You can use algor like any standard Python library. You will need to make sure that you have a development environment consisting of a Python distribution including header files, a compiler, pip, and git installed. Make sure that your pip, setuptools, and wheel are up to date. When using pip it is generally recommended to install packages in a virtual environment to avoid changes to the system.
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