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Merge pull request #418 from iden3/iden232
IDEN-232 get rid of merkletree dependency. Replace merkletree.Hash ty…
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,63 @@ | ||
| package core | ||
|
|
||
| import ( | ||
| "encoding/hex" | ||
| "math/big" | ||
|
|
||
| "github.com/iden3/go-iden3-crypto/utils" | ||
| ) | ||
|
|
||
| // ElemBytes length is 32 bytes. But not all 32-byte values are valid. | ||
| // The value should be not greater than Q constant | ||
| // 21888242871839275222246405745257275088548364400416034343698204186575808495617 | ||
| type ElemBytes [32]byte | ||
|
|
||
| // ToInt returns *big.Int representation of ElemBytes. | ||
| func (el ElemBytes) ToInt() *big.Int { | ||
| return new(big.Int).SetBytes(utils.SwapEndianness(el[:])) | ||
| } | ||
|
|
||
| // SetInt sets element's data to serialized value of *big.Int in little-endian. | ||
| // And checks that the value is valid (fits in Field Q). | ||
| // Returns ErrDataOverflow if the value is too large | ||
| func (el *ElemBytes) SetInt(value *big.Int) error { | ||
| if !utils.CheckBigIntInField(value) { | ||
| return ErrDataOverflow | ||
| } | ||
|
|
||
| val := utils.SwapEndianness(value.Bytes()) | ||
| copy((*el)[:], val) | ||
| memset((*el)[len(val):], 0) | ||
| return nil | ||
| } | ||
|
|
||
| // Hex returns HEX representation of ElemBytes | ||
| func (el ElemBytes) Hex() string { | ||
| return hex.EncodeToString(el[:]) | ||
| } | ||
|
|
||
| // NewElemBytesFromInt creates new ElemBytes from *big.Int. | ||
| // Returns error ErrDataOverflow if value is too large to fill the Field Q. | ||
| func NewElemBytesFromInt(i *big.Int) (ElemBytes, error) { | ||
| var s ElemBytes | ||
| bs := i.Bytes() | ||
| // may be this check is redundant because of CheckBigIntInField, but just | ||
| // in case. | ||
| if len(bs) > len(s) { | ||
| return s, ErrDataOverflow | ||
| } | ||
| if !utils.CheckBigIntInField(i) { | ||
| return s, ErrDataOverflow | ||
| } | ||
| copy(s[:], utils.SwapEndianness(bs)) | ||
| return s, nil | ||
| } | ||
|
|
||
| // ElemBytesToInts converts slice of ElemBytes to slice of *big.Int | ||
| func ElemBytesToInts(elements []ElemBytes) []*big.Int { | ||
| result := make([]*big.Int, len(elements)) | ||
| for i := range elements { | ||
| result[i] = elements[i].ToInt() | ||
| } | ||
| return result | ||
| } |
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