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36 lines
1.1 KiB
Plaintext
36 lines
1.1 KiB
Plaintext
$ fq -h asn1_ber
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asn1_ber: ASN1 BER (basic encoding rules, also CER and DER) decoder
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Decode examples
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===============
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# Decode file as asn1_ber
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$ fq -d asn1_ber . file
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# Decode value as asn1_ber
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... | asn1_ber
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Supports decoding BER, CER and DER (X.690).
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- Currently no extra validation is done for CER and DER.
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- Does not support specifying a schema.
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- Supports torepr but without schema all sequences and sets will be arrays.
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Can be used to decode certificates etc
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======================================
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$ fq -d bytes 'from_pem | asn1_ber | d' cert.pem
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Can decode nested values
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========================
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$ fq -d asn1_ber '.constructed[1].value | asn1_ber' file.ber
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Manual schema
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=============
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$ fq -d asn1_ber 'torepr as $r | ["version", "modulus", "private_exponent", "private_exponen", "prime1", "prime2", "exponent1", "exponent2", "coefficient"] | with_entries({key: .value, value: $r[.key]})' pkcs1.der
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References
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==========
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- https://www.itu.int/ITU-T/studygroups/com10/languages/X.690_1297.pdf
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- https://en.wikipedia.org/wiki/X.690
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- https://letsencrypt.org/docs/a-warm-welcome-to-asn1-and-der/
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- https://lapo.it/asn1js/
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