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author | Christopher Speller <crspeller@gmail.com> | 2018-04-16 05:37:14 -0700 |
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committer | Joram Wilander <jwawilander@gmail.com> | 2018-04-16 08:37:14 -0400 |
commit | 6e2cb00008cbf09e556b00f87603797fcaa47e09 (patch) | |
tree | 3c0eb55ff4226a3f024aad373140d1fb860a6404 /vendor/golang.org/x/crypto/ed25519/internal | |
parent | bf24f51c4e1cc6286885460672f7f449e8c6f5ef (diff) | |
download | chat-6e2cb00008cbf09e556b00f87603797fcaa47e09.tar.gz chat-6e2cb00008cbf09e556b00f87603797fcaa47e09.tar.bz2 chat-6e2cb00008cbf09e556b00f87603797fcaa47e09.zip |
Depenancy upgrades and movign to dep. (#8630)
Diffstat (limited to 'vendor/golang.org/x/crypto/ed25519/internal')
-rw-r--r-- | vendor/golang.org/x/crypto/ed25519/internal/edwards25519/edwards25519.go | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/vendor/golang.org/x/crypto/ed25519/internal/edwards25519/edwards25519.go b/vendor/golang.org/x/crypto/ed25519/internal/edwards25519/edwards25519.go index 5f8b99478..fd03c252a 100644 --- a/vendor/golang.org/x/crypto/ed25519/internal/edwards25519/edwards25519.go +++ b/vendor/golang.org/x/crypto/ed25519/internal/edwards25519/edwards25519.go @@ -4,6 +4,8 @@ package edwards25519 +import "encoding/binary" + // This code is a port of the public domain, “ref10” implementation of ed25519 // from SUPERCOP. @@ -1769,3 +1771,23 @@ func ScReduce(out *[32]byte, s *[64]byte) { out[30] = byte(s11 >> 9) out[31] = byte(s11 >> 17) } + +// order is the order of Curve25519 in little-endian form. +var order = [4]uint64{0x5812631a5cf5d3ed, 0x14def9dea2f79cd6, 0, 0x1000000000000000} + +// ScMinimal returns true if the given scalar is less than the order of the +// curve. +func ScMinimal(scalar *[32]byte) bool { + for i := 3; ; i-- { + v := binary.LittleEndian.Uint64(scalar[i*8:]) + if v > order[i] { + return false + } else if v < order[i] { + break + } else if i == 0 { + return false + } + } + + return true +} |