This is a sample script for converting from the string value to the hex value, from the hex value to the byte array, from the byte array to the string value using Google Apps script.
When the creation of a signature for requesting and the encryption of data are used, there is the case that these conversions are required to be used. So I would like to introduce these scripts as sample scripts.
const str = "sample string"; // This is a original string value.
// Convert string to hex.
const hexFromStr = Utilities.newBlob(str)
.getBytes()
.map((byte) => ("0" + (byte & 0xff).toString(16)).slice(-2))
.join("");
console.log(hexFromStr); // <--- 73616d706c6520737472696e67
// Convert hex to bytes.
const bytesFromHex = hexFromStr
.match(/.{2}/g)
.map((e) =>
parseInt(e[0], 16).toString(2).length == 4
? parseInt(e, 16) - 256
: parseInt(e, 16)
);
console.log(bytesFromHex); // <--- [ 115, 97, 109, 112, 108, 101, 32, 115, 116, 114, 105, 110, 103 ]
// Convert bytes to string.
const strFromBytes = Utilities.newBlob(bytesFromHex).getDataAsString();
console.log(strFromBytes); // <--- sample string
- When this script is run,
- At Convert string to hex,
sample string
is converted to73616d706c6520737472696e67
. - At Convert hex to bytes,
73616d706c6520737472696e67
is converted to[ 115, 97, 109, 112, 108, 101, 32, 115, 116, 114, 105, 110, 103 ]
.- At Google Apps Script, the bytes array is the signed hexadecimal. At Javascript, it's the unsigned hexadecimal. I think that this is the important point.
- At Convert bytes to string,
[ 115, 97, 109, 112, 108, 101, 32, 115, 116, 114, 105, 110, 103 ]
is converted tosample string
.
- At Convert string to hex,