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21 lines
1003 B
Markdown
21 lines
1003 B
Markdown
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# Group Element Additions
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Urbit uses the ge.h code from the ed25519 library, which was ported from the
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ref10 SUPERCOP public domain implementation. That implementation doesn't
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contain several functions needed for ring signatures.
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This file does. The providence of this code starts with Adam Langley taking
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the SUPERCOP C implementation and producing an ed25519 implementation for it
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in golang (https://godoc.org/golang.org/x/crypto/ed25519). (If you look at
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the go code, you'll see the comments are the same as the comments in the C
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implementation.)
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From there, the DEDIS group from ETH Zurich took that implementation and
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added the additional methods to make a generalized ECC point library. While
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their project as a whole is MPL, they deliberately left their ed25519
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implementation under the Go BSD-3 license:
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(https://github.com/dedis/kyber/blob/master/group/edwards25519/LICENSE)
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This file is a fairly straight translation from Go to C of DEDIS' additions,
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so this falls under the same license.
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