sigutils | Small signal processing utility library

by BatchDrake C Version: v0.3.0 License: GPL-3.0

X-Ray Key Features Code Snippets(3)Community Discussions(6)Vulnerabilities Install Support

kandi X-RAY | sigutils Summary

sigutils is a C library. sigutils has no bugs, it has no vulnerabilities, it has a Strong Copyleft License and it has low support. You can download it from GitHub, GitLab.

There are three API levels in sigutils, with every high-level API relying on lower-level APIs:.

Support

Quality

Security

License

Reuse

Support

sigutils has a low active ecosystem.

It has 51 star(s) with 25 fork(s). There are 13 watchers for this library.

It had no major release in the last 12 months.

There are 8 open issues and 11 have been closed. On average issues are closed in 230 days. There are 3 open pull requests and 0 closed requests.

It has a neutral sentiment in the developer community.

The latest version of sigutils is v0.3.0

Quality

sigutils has 0 bugs and 0 code smells.

Security

sigutils has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

sigutils code analysis shows 0 unresolved vulnerabilities.

There are 0 security hotspots that need review.

License

sigutils is licensed under the GPL-3.0 License. This license is Strong Copyleft.

Strong Copyleft licenses enforce sharing, and you can use them when creating open source projects.

Reuse

sigutils releases are available to install and integrate.

Installation instructions are not available. Examples and code snippets are available.

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sigutils Key Features

No Key Features are available at this moment for sigutils.

sigutils Examples and Code Snippets

sigutils API overview,The modem API,Configuring the modem

Lines of Code : 24

License : Strong Copyleft (GPL-3.0)

Copy

if (!su_modem_set_wav_source(modem, "test.wav")) {
  fprintf(
      stderr,
      "su_modem_set_wav_source: failed to set modem wav source to test.wav\n");
  exit(EXIT_FAILURE);
}

su_block_t *source_block = /* initialize source */;

if (!su_modem_se

sigutils API overview,The modem API,Reading symbols

Lines of Code : 9

License : Strong Copyleft (GPL-3.0)

Copy

SUSYMBOL sym;

/* While we don't reach the end of the stream */
while((sym = su_modem_read(modem)) != SU_EOS) {
  if (sym != SU_NOSYMBOL) {
    printf("Got symbol: %d\n", sym);
  }
}

sigutils API overview,The modem API,Creating a QPSK modem

Lines of Code : 6

License : Strong Copyleft (GPL-3.0)

Copy

su_modem_t *modem;  
	
if ((modem = su_modem_new("qpsk")) == NULL) {  
  fprintf(stderr, "su_modem_new: failed to initialize QPSK modem\n");  
  exit(EXIT_FAILURE);  
}

Community Discussions

Trending Discussions on sigutils

Certified Document when Approval Signature exist

PDFBox - sign PDF have existing signed by another

Message digest in a base64 encoded signed attributes DER structure

PAdES Signature Level - Adobe Acrobat

Unable to find out how to specify datetime dtype to Numba @guvectorize

How do I vectorize a function which has multiple outputs with Numba?

QUESTION

Certified Document when Approval Signature exist

Asked 2022-Jan-25 at 10:00

Working with java use Apache PDFBox to sign and certified, invalid certified if signature exist, with JsignPDF was able to certified when approval exist, the process is sign after that do certified (seal) document

Signature with JsignPDF

document after certified with JsignPDF :

the certified invalid with PDFBox

the function from PDFBox with some editing was to try :

...

ANSWER

Answered 2022-Jan-25 at 10:00

This answer essentially is a more detailed version of the comments, essentially finding that what you want to do is not possible.

You ask for a way to

Certify Document when Approval Signature exist

According to the current PDF specification:

ISO 32000-2:2020 subsection 12.8.1 "General" of 12.8 "Digital signatures" A PDF document may contain the following standard types of signatures: [...] One or more approval signatures (also known as recipient signatures). These shall follow the certification signature if one is present.

Thus, you cannot validly add a certification signature to a PDF which already has approval signatures.

(This does not automatically mean that all validators will detect the issue if you add a certification signature after approval signatures, let alone correctly display the cause. Many validators only do a subset of the checks that strictly speaking are necessary...)

More question if the certification signature come first then next is approval like 3 signature approval, can the last the certification setMDPPermission with 1 ? so at the end the document can't add more approval signature

setMDPPermission adds a DocMDP transform to the signature, and such a transform makes the signature a certification signature. Thus, using this method when signing a document that already has an approval signature, will create an invalid PDF or fail entirely.

You can lock a PDF document with an approval signature, though, if you add a Lock dictionary to the signature field with a P entry of 1. Beware, though, this is a ISO 32000-2 feature originally introduced as a feature of an Adobe Extension to ISO 32000-1. Not all PDF viewers support ISO 32000-2 yet, so some viewers may not respect this entry.

Source https://stackoverflow.com/questions/70843036

QUESTION

PDFBox - sign PDF have existing signed by another

Asked 2021-Sep-13 at 09:12

Trying to sign a PDF existing signed with PDFBox

with this test function :

...

ANSWER

Answered 2021-Sep-13 at 09:12

The error message "DocMDP transform method not allowed if an approval signature exists" is correct.

If you want to add a signature to an already signed PDF, simply remove the

Source https://stackoverflow.com/questions/69159496

QUESTION

Message digest in a base64 encoded signed attributes DER structure

Asked 2021-Jun-03 at 17:58

I have the following ASN1 ASN.1 dump

...

ANSWER

Answered 2021-May-27 at 07:03

In Short

The document hash is not calculated from the original PDF you want to sign. That PDF first is prepared for signing by applying certain changes, and then the hash is calculated from this prepared PDF except a placeholder gap in it prepared to later house the signature container.

In Detail

To create an integrated PDF signature, certain changes have to be applied to the PDF:

The holder of the to-be-integrated signature is an AcroForm form field in the PDF. If the PDF does not contain an empty, unused signature field (or no existing field shall be used), a new signature field has to be added to the PDF.
A signature form field may have a visualization, a widget annotation, which represents the signature on some page of the document itself. If such a visualization is desired, a matching annotation has to be added to the PDF.
Information describing the mode and other details of signing have to be added to the PDF. Thus, the value of the chosen signature field has to be set to a new dictionary object in the PDF with these signature details; there are two special entries here, the ByteRange and the Contents. Both are set to blank values of appropriate size for starters.
A marker is added to the PDF root AcroForm object indicating that the PDF is signed.

With these additions the PDF is stored. Thereafter the position of the Contents value in the file is fixed and the blank value of the ByteRange value is patched to an array of four integers, the start offset and size of the file segment before the Contents value and the start offset and size of the file segment thereafter.

Then the bytes of these segments of the file are hashed and a CMS signature container signing this document hash is generated which in turn is injected into the Contents value.

In your case the hash you find in the to-be-signed attributes,

Source https://stackoverflow.com/questions/67712321

QUESTION

PAdES Signature Level - Adobe Acrobat

Asked 2021-May-05 at 13:17

I am creating a PADES signature using pdfbox 3.0.0 RC, my code works using the example to create the digital signature. However, I am unable to see the signature level in Adobe Acrobat when I open the document with this tool although it is able to validate my signature.

I am not creating the VRI so I am guessing that this might be an issue but then if this is necessary to validate my signature I don't understand why the signature is displayed as valid?

Adobe Acrobat Signature:

...

ANSWER

Answered 2021-May-05 at 13:17

While analyzing the file document-with signingTime.pdf you provided in a comment, I recognized an issue in it. Being aware of that issue I re-checked your original document-17 21.08.14.pdf and also recognized that issue therein, so maybe this issue causes the validation problem you're here to solve. Thus, ...

Both your example files (document-17 21.08.14.pdf and document-with signingTime.pdf) contain each actually two concatenated copies of the same, multi-revision PDF with a single signature Signature1, merely the second copy has a changed ID entry. Added to them are incremental updates with a signature Signature2.

Source https://stackoverflow.com/questions/67055789

QUESTION

Unable to find out how to specify datetime dtype to Numba @guvectorize

Asked 2021-Mar-31 at 22:31

I would like to handle array of datetime values in Numba. I tried so on a small example, but I am unable to have it working.

...

ANSWER

Answered 2021-Mar-31 at 22:31

guvectorize does not work with datetime types. Convert to float timestamp.

Source https://stackoverflow.com/questions/66895438

QUESTION

How do I vectorize a function which has multiple outputs with Numba?

Asked 2021-Mar-19 at 00:10

For example, I want to vectorize the following function:

...

ANSWER

Answered 2021-Mar-19 at 00:10

vectorize only works on a single scalar output (broadcasted to the dimensions of your input vector). As a workaround you can use guvectorize:

Source https://stackoverflow.com/questions/66562140

Community Discussions, Code Snippets contain sources that include Stack Exchange Network

Vulnerabilities

No vulnerabilities reported

Install sigutils

You can download it from GitHub, GitLab.

Support

For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .

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