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31 lines
927 B
Text
31 lines
927 B
Text
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libuecc is a very small generic-purpose Elliptic Curve Cryptography library
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compatible with Ed25519.
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Most documentation can be found as Doxygen comments in the ecc.h header
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file. You can use `make doxygen` after running CMake to create HTML
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documenation from it.
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There are two sets of functions converting between libuecc's internal point
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representation and coordinates or compressed representation. The functions
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ending with _ed25519 use the same representation as original Ed25519
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implementation and should be used by new software. The functions with the
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suffix _legacy are provided for compatiblity with libuecc version before
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v6.
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Ed25519 and the legacy representation are isomorphic, they use a Twisted
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Edwards Curve
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ax^2 + y^2 = 1 + dx^2y^2
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over the prime field for p = 2^255 - 19.
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Ed25519 uses the parameters
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a = -1 and
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d = -(121665/121666),
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while the legacy curve has
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a = 486664
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d = 486660.
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