package avx2 import ( "encoding/binary" "encoding/hex" "github.com/nspcc-dev/tzhash/gf127" ) // GF127x2 represents a pair of elements of GF(2^127) stored together. type GF127x2 [2]gf127.GF127 // Split returns 2 components of pair without additional allocations. func Split(a *GF127x2) (*gf127.GF127, *gf127.GF127) { return &a[0], &a[1] } // CombineTo 2 elements of GF(2^127) to the respective components of pair. func CombineTo(a *gf127.GF127, b *gf127.GF127, c *GF127x2) { c[0] = *a c[1] = *b } // Equal checks if both elements of GF(2^127) pair are equal. func (a *GF127x2) Equal(b *GF127x2) bool { return a[0] == b[0] && a[1] == b[1] } // String returns hex-encoded representation, starting with MSB. // Elements of pair are separated by comma. func (a *GF127x2) String() string { b := a.ByteArray() return hex.EncodeToString(b[:16]) + " , " + hex.EncodeToString(b[16:]) } // ByteArray represents element of GF(2^127) as byte array of length 32. func (a *GF127x2) ByteArray() (buf []byte) { buf = make([]byte, 32) binary.BigEndian.PutUint64(buf, a[0][1]) binary.BigEndian.PutUint64(buf[8:], a[0][0]) binary.BigEndian.PutUint64(buf[16:], a[1][1]) binary.BigEndian.PutUint64(buf[24:], a[1][0]) return } // Mul10x2 sets (b1, b2) to (a1*x, a2*x) func Mul10x2(a, b *GF127x2) // Mul10x2 sets (b1, b2) to (a1*(x+1), a2*(x+1)) func Mul11x2(a, b *GF127x2)