ASN1 integer encoding#289

Merged

gilles-peskine-arm merged 46 commits intoMbed-TLS:developmentfrom

bjwtaylor:ASN1-integer-encoding

Jul 1, 2025

Commits on Jun 30, 2025

Move mbedtls_asn1_write_mpi to bignum.h as it is now private

Ben Taylor
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Add initial test for asn1 encode

Ben Taylor
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Added initial POC

Ben Taylor
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Add additional test cases

Ben Taylor
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added in processor endian detection and conversion

Ben Taylor
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Fix size check test and adjust to re-use buffer where possible

Ben Taylor
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tidy up of asn1 encode tests

Ben Taylor
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remove data_t

Ben Taylor
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Update tests and fix endian

Ben Taylor
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Remove debug and add code to handle clause 8.3.2 of the X.690-0207 spec

Ben Taylor
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Remove debug lines
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tidied up error handling

Ben Taylor
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Add function docs for asn1_write

Ben Taylor
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Correct return value of p after an error

Ben Taylor
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Improve bignum writing in asn1_write

Ben Taylor
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Add code to handle leading zero's

Ben Taylor
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Improve naming of asn1_write test cases

Ben Taylor
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fix style issues and tidy up

Ben Taylor
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Remove sign parameter
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Fix typo
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Remove imprecise warning
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Clarify integer start and length descriptions
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Rewrite function description
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Preexisting: Use the definite article in notes
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Rename input_buffer_size -> output_buffer_size
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Remove unnecessary error checks:
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Adjust for leading zeroes before checking space
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Fix buffer overread in leading-zero count
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Add basic positive testcase
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Allow NULL pointers for zero-length output buffers
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Add remaining positive testcases
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Fix bug when dealing with the value zero
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Do not attempt to memset() a zero-length buffer
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Add note about overlap
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Remove unnecessary testcases
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Remove NULL pointer checks
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Tidy up checks for successful encoding cases
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Add extra testcases for interesting leading-zeroes
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Allocate a new buffer for test inputs
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Set the test step
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Remove useless cast
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Do not check for zero-length output buffers
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Re-add zero-length test
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Remove guarantee about p on failure
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Fix buffer overread in tests
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Add ChangeLog entry for ASN.1 integer function
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