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Merge #684: Make no-float policy explicit

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bae1bea3c4b46a2fb5ca76ff6bf1e98d43cff52f Make no-float policy explicit (Tim Ruffing)

Pull request description:

  We don't want floating types for various reasons, e.g.,
   - Their representation and often their behavior is implementation-defined.
   - Many targets don't support them.

  Closes #683.

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  jonasnick:
    ACK bae1bea3c4b46a2fb5ca76ff6bf1e98d43cff52f

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Jonas Nick 2019-11-01 10:21:09 +00:00
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@ -23,6 +23,7 @@ Implementation details
* Extensive testing infrastructure. * Extensive testing infrastructure.
* Structured to facilitate review and analysis. * Structured to facilitate review and analysis.
* Intended to be portable to any system with a C89 compiler and uint64_t support. * Intended to be portable to any system with a C89 compiler and uint64_t support.
* No use of floating types, except in benchmarks.
* Expose only higher level interfaces to minimize the API surface and improve application security. ("Be difficult to use insecurely.") * Expose only higher level interfaces to minimize the API surface and improve application security. ("Be difficult to use insecurely.")
* Field operations * Field operations
* Optimized implementation of arithmetic modulo the curve's field size (2^256 - 0x1000003D1). * Optimized implementation of arithmetic modulo the curve's field size (2^256 - 0x1000003D1).