52 lines
2.2 KiB
XML
52 lines
2.2 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE dita PUBLIC "-//OASIS//DTD DITA Composite//EN" "ditabase.dtd">
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<dita xml:lang="en-GB">
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<topic id="topic_ntx_sqz_5db">
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<title>Default Signatures</title>
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<body>
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<p>The normal or default signing process is essentially the same as is most often
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invoked when also encrypting a message or file. So when the encryption component is not
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utilised, the result is to produce an encoded and signed output which may or may not be
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ASCII armoured and which may or may not also be compressed.</p>
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<p>By default compression will be used unless GnuPG detects that the plaintext is already
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compressed. ASCII armouring will be determined according to the value of
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<codeph>gpg.Context().armor</codeph>.</p>
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<p>The compression algorithm is selected in much the same way as the symmetric encryption
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algorithm or the hash digest algorithm is when multiple keys are involved; from the
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preferences saved into the key itself or by comparison with the preferences with all other
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keys involved.</p>
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<p>
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<codeblock id="defsig-1" outputclass="language-python">import gpg
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text0 = """Declaration of ... something.
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"""
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text = text0.encode()
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c = gpg.Context(armor=True, signers=sig_src)
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signed_data, result = c.sign(text, mode=gpg.constants.sig.mode.NORMAL)
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with open("/path/to/statement.txt.asc", "w") as afile:
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afile.write(signed_data.decode())
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</codeblock>
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</p>
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<p>Though everything in this example is accurate, it is more likely that reading the input
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data from another file and writing the result to a new file will be performed more like the
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way it is done in the next example. Even if the output format is ASCII armoured.</p>
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<p>
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<codeblock id="defsig-2" outputclass="language-python">import gpg
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with open("/path/to/statement.txt", "rb") as tfile:
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text = tfile.read()
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c = gpg.Context()
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signed_data, result = c.sign(text, mode=gpg.constants.sig.mode.NORMAL)
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with open("/path/to/statement.txt.sig", "wb") as afile:
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afile.write(signed_data)
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</codeblock>
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</p>
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</body>
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</topic>
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</dita>
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