Extend elliptic curve code generator to generate C code boilerplate. #1780
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Generate some of the C boilerplate, particularly the large constants.
The output is written into target/curves/, and can be merged into
the actual code in crypto/fipsmodule/ec/ using a two-way merge tool;
this is the same as the Rust code generation.
Changes to gfp_p{256,384}.c are due to differences in the generator's
output:
* The generator doesn't generate trailing commas in arrays.
* The generator consistently avoids adding leading zeros to hex
constants, and consistently format values less than 10 in decimal;
the exiting code used a mix of styles.
* The generator wraps arrays consistently; the existing code used a
mix of wrapping styles.
* The generator does not nest constants in the functions that need
them. This was changed to support future refactorings.
Values for P-521 have an odd number of limbs in 32-bit mode, which means we can't keep using `TOBN`, and also Montgomery-encoded values are different for 32-bit and 64-bit.
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@vkrasnov PTAL. |
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Generate some of the C boilerplate, particularly the large constants. The output is written into target/curves/, and can be merged into the actual code in crypto/fipsmodule/ec/ using a two-way merge tool; this is the same as the Rust code generation.
Changes to gfp_p{256,384}.c are due to differences in the generator's output:
TOBNas it won't work for 32-bit targets for P-521 since there are an odd number of limbs in that case.