hex_bytes.go

Documentation: github.com/theupdateframework/go-tuf/data

     1  package data
     2  
     3  import (
     4  	"crypto/sha256"
     5  	"encoding/hex"
     6  	"errors"
     7  )
     8  
     9  type HexBytes []byte
    10  
    11  func (b *HexBytes) UnmarshalJSON(data []byte) error {
    12  	if len(data) < 2 || len(data)%2 != 0 || data[0] != '"' || data[len(data)-1] != '"' {
    13  		return errors.New("tuf: invalid JSON hex bytes")
    14  	}
    15  	res := make([]byte, hex.DecodedLen(len(data)-2))
    16  	_, err := hex.Decode(res, data[1:len(data)-1])
    17  	if err != nil {
    18  		return err
    19  	}
    20  	*b = res
    21  	return nil
    22  }
    23  func (b *HexBytes) FromString(data []byte) error {
    24  	res := make([]byte, hex.DecodedLen(len(data)))
    25  	_, err := hex.Decode(res, data)
    26  	if err != nil {
    27  		return err
    28  	}
    29  	*b = res
    30  	return nil
    31  }
    32  
    33  func (b HexBytes) MarshalJSON() ([]byte, error) {
    34  	res := make([]byte, hex.EncodedLen(len(b))+2)
    35  	res[0] = '"'
    36  	res[len(res)-1] = '"'
    37  	hex.Encode(res[1:], b)
    38  	return res, nil
    39  }
    40  
    41  func (b HexBytes) String() string {
    42  	return hex.EncodeToString(b)
    43  }
    44  
    45  // 4.5. File formats: targets.json and delegated target roles:
    46  // ...each target path, when hashed with the SHA-256 hash function to produce
    47  // a 64-byte hexadecimal digest (HEX_DIGEST)...
    48  func PathHexDigest(s string) string {
    49  	b := sha256.Sum256([]byte(s))
    50  	return hex.EncodeToString(b[:])
    51  }
    52
View as plain text