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34 lines
963 B
34 lines
963 B
package edwards_curve
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import (
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"math/big"
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)
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var (
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qEd25519, rEd25519 *big.Int
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)
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func init() {
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// https://neuromancer.sk/std/other/Ed25519
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qEd25519, _ = new(big.Int).SetString("7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffed", 16)
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n, _ := new(big.Int).SetString("1000000000000000000000000000000014def9dea2f79cd65812631a5cf5d3ed", 16)
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// TODO: is this ok?
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// h := big.NewInt(8)
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// rEd25519 = new(big.Int).Mul(n, h)
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rEd25519 = n
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}
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type Ed25519 struct{}
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func (fp Ed25519) NbLimbs() uint { return 4 }
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func (fp Ed25519) BitsPerLimb() uint { return 64 }
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func (fp Ed25519) IsPrime() bool { return true }
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func (fp Ed25519) Modulus() *big.Int { return qEd25519 }
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type Ed25519Scalars struct{}
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func (fp Ed25519Scalars) NbLimbs() uint { return 4 }
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func (fp Ed25519Scalars) BitsPerLimb() uint { return 64 }
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func (fp Ed25519Scalars) IsPrime() bool { return true }
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func (fp Ed25519Scalars) Modulus() *big.Int { return rEd25519 }
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