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/**
 * @fileoverview Provides the hashing algorithm for User-Provided Data Match, as
 * well as some valid hashes of sample data for testing.
*/

async function hash(token) {
  // Removes leading or trailing spaces and converts all characters to lowercase.
  const formattedToken = token.trim().toLowerCase();
  // Hashes the formatted string using the SHA-256 hashing algorithm.
  const hashArrayBuffer = await crypto.subtle.digest(
      'SHA-256', (new TextEncoder()).encode(formattedToken));
  // Converts the hash buffer to a hexadecimal string.
  return Array.from(new Uint8Array(hashArrayBuffer))
      .map((b) => b.toString(16).padStart(2, '0'))
      .join('');
}

function main() {
  // Expected hash for [email protected]:
  // 87924606b4131a8aceeeae8868531fbb9712aaa07a5d3a756b26ce0f5d6ca674
  hash('[email protected]').then(result => console.log(result));

  // Expected hash for +18005551212:
  // 61d9111bed3e6d9cfc1bc3b5cb35a402687c4f1546bee061a2bd444fbdd64c44
  hash('+18005551212').then(result => console.log(result));

  // Expected hash for John:
  // 96d9632f363564cc3032521409cf22a852f2032eec099ed5967c0d000cec607a
  hash('John').then(result => console.log(result));

  // Expected hash for Doe:
  // 799ef92a11af918e3fb741df42934f3b568ed2d93ac1df74f1b8d41a27932a6f
  hash('Doe').then(result => console.log(result));
}

main()

/**
 * @fileoverview Provides the hashing algorithm, as well as some valid hashes of
 * sample data for testing.
*/

async function hash(token) {
  // Removes leading or trailing spaces and converts all characters to lowercase.
  const formattedToken = token.trim().toLowerCase();
  // Hashes the formatted string using the SHA-256 hashing algorithm.
  const hashBuffer = await crypto.subtle.digest(
      'SHA-256', (new TextEncoder()).encode(formattedToken));
  // Converts the hash buffer to a base64-encoded string and returns it.
  const base64Str = btoa(String.fromCharCode(...new Uint8Array(hashBuffer)));
  return base64Str;
}

function main() {
  // Expected hash for [email protected]:
  // h5JGBrQTGorO7q6IaFMfu5cSqqB6XTp1aybOD11spnQ=
  hash('[email protected]').then(result => console.log(result));

  // Expected hash for +18005551212:
  // YdkRG+0+bZz8G8O1yzWkAmh8TxVGvuBhor1ET73WTEQ=
  hash('+18005551212').then(result => console.log(result));

  // Expected hash for John: ltljLzY1ZMwwMlIUCc8iqFLyAy7sCZ7VlnwNAAzsYHo=
  hash('John').then(result => console.log(result));

  // Expected hash for Doe: eZ75KhGvkY4/t0HfQpNPO1aO0tk6wd908bjUGieTKm8=
  hash('Doe').then(result => console.log(result));
}

main()

"""Provides the hashing algorithm, as well as some valid hashes of sample data for testing.

Supports: Python 2, Python 3

Sample hashes:

  - Email '[email protected]': 87924606b4131a8aceeeae8868531fbb9712aaa07a5d3a756b26ce0f5d6ca674
  - Phone '+18005551212':   61d9111bed3e6d9cfc1bc3b5cb35a402687c4f1546bee061a2bd444fbdd64c44
  - First name 'John':      96d9632f363564cc3032521409cf22a852f2032eec099ed5967c0d000cec607a
  - Last name 'Doe':        799ef92a11af918e3fb741df42934f3b568ed2d93ac1df74f1b8d41a27932a6f
"""

import base64
import hashlib

def updm_hash(token):
# Generates a SHA-256 hash of the input token after normalization.
  return hashlib.sha256(token.strip().lower().encode('utf-8')).hexdigest()

def print_updm_hash(token):
# Prints the SHA-256 hash and the original token.
  print('Hash: "{}"\t(Token: {})'.format(updm_hash(token), token))

def main():
# Hashes and prints sample tokens.
  print_updm_hash('[email protected]')
  print_updm_hash('+18005551212')
  print_updm_hash('John')
  print_updm_hash('Doe')

if __name__ == '__main__':
  main()

"""Provides the hashing algorithm, as well as some valid hashes of sample data for testing.

Supports: Python 2, Python 3

Sample hashes:

  - Email '[email protected]': h5JGBrQTGorO7q6IaFMfu5cSqqB6XTp1aybOD11spnQ=
  - Phone '+18005551212':   YdkRG+0+bZz8G8O1yzWkAmh8TxVGvuBhor1ET73WTEQ=
  - First name 'John':      ltljLzY1ZMwwMlIUCc8iqFLyAy7sCZ7VlnwNAAzsYHo=
  - Last name 'Doe':        eZ75KhGvkY4/t0HfQpNPO1aO0tk6wd908bjUGieTKm8=
"""

import base64
import hashlib

def hash(token):
# Generates a base64-encoded SHA-256 hash of a normalized input string.
  return base64.b64encode(
      hashlib.sha256(
          token.strip().lower().encode('utf-8')).digest()).decode('utf-8')

def print_hash(token, expected=None):
# Computes and displays the hash of a token, with optional validation.
  hashed = hash(token)

  if expected is not None and hashed != expected:
    print(
        'ERROR: Incorrect hash for token "{}". Expected "{}", got "{}"'.format(
            token, expected, hashed))
    return

  print('Hash: "{}"\t(Token: {})'.format(hashed, token))

def main():
# Tests the hash function with sample tokens and expected results.
  print_hash(
      '[email protected]', expected='h5JGBrQTGorO7q6IaFMfu5cSqqB6XTp1aybOD11spnQ=')
  print_hash(
      '+18005551212', expected='YdkRG+0+bZz8G8O1yzWkAmh8TxVGvuBhor1ET73WTEQ=')
  print_hash('John', expected='ltljLzY1ZMwwMlIUCc8iqFLyAy7sCZ7VlnwNAAzsYHo=')
  print_hash('Doe', expected='eZ75KhGvkY4/t0HfQpNPO1aO0tk6wd908bjUGieTKm8=')

if __name__ == '__main__':
  main()

/*
Provides the hashing algorithm, as well as some valid hashes of sample data for testing.

Sample hashes:

  - Email '[email protected]': 87924606b4131a8aceeeae8868531fbb9712aaa07a5d3a756b26ce0f5d6ca674
  - Phone '+18005551212':   61d9111bed3e6d9cfc1bc3b5cb35a402687c4f1546bee061a2bd444fbdd64c44
  - First name 'John':      96d9632f363564cc3032521409cf22a852f2032eec099ed5967c0d000cec607a
  - Last name 'Doe':        799ef92a11af918e3fb741df42934f3b568ed2d93ac1df74f1b8d41a27932a6f
*/
package main

import (
  "crypto/sha256"
  "fmt"
  "strings"
)

// Hash hashes an email, phone, first name, or last name into the correct format.
func Hash(token string) string {
  formatted := strings.TrimSpace(strings.ToLower(token))
  hashed := sha256.Sum256([]byte(formatted))
  encoded := fmt.Sprintf("%x", hashed[:])
  return encoded
}

// PrintHash prints the hash for a token.
func PrintHash(token string) {
  fmt.Printf("Hash: \"%s\"\t(Token: %s)\n", Hash(token), token)

}

func main() {
  PrintHash("[email protected]")
  PrintHash("+18005551212")
  PrintHash("John")
  PrintHash("Doe")
}

/*
Provides the hashing algorithm, as well as some valid hashes of sample data for testing.

Sample hashes:

  - Email '[email protected]': h5JGBrQTGorO7q6IaFMfu5cSqqB6XTp1aybOD11spnQ=
  - Phone '+18005551212':   YdkRG+0+bZz8G8O1yzWkAmh8TxVGvuBhor1ET73WTEQ=
  - First name 'John':      ltljLzY1ZMwwMlIUCc8iqFLyAy7sCZ7VlnwNAAzsYHo=
  - Last name 'Doe':        eZ75KhGvkY4/t0HfQpNPO1aO0tk6wd908bjUGieTKm8=
*/
package main

import (
  "crypto/sha256"
  "encoding/base64"
  "fmt"
  "strings"
)

// Hash hashes an email, phone, first name, or last name into the correct format.
func Hash(token string) string {
  formatted := strings.TrimSpace(strings.ToLower(token))
  hashed := sha256.Sum256([]byte(formatted))
  encoded := base64.StdEncoding.EncodeToString(hashed[:])
  return encoded
}

// PrintHash prints the hash for a token.
func PrintHash(token string) {
  fmt.Printf("Hash: \"%s\"\t(Token: %s)\n", Hash(token), token)

}

func main() {
  PrintHash("[email protected]")
  PrintHash("+18005551212")
  PrintHash("John")
  PrintHash("Doe")
}

package updm.hashing;

import static java.nio.charset.StandardCharsets.UTF_8;

import com.google.common.base.Ascii;
import com.google.common.hash.Hashing;

/**
 * Example of the UPDM hashing algorithm using hex-encoded SHA-256.
*
* <p>This uses the Guava Hashing to generate the hash: https://github.com/google/guava
*
* <p>Sample valid hashes:
*
* <ul>
*   <li>Email "[email protected]": "87924606b4131a8aceeeae8868531fbb9712aaa07a5d3a756b26ce0f5d6ca674"
*   <li>Phone "+18005551212": "61d9111bed3e6d9cfc1bc3b5cb35a402687c4f1546bee061a2bd444fbdd64c44"
*   <li>First name "John": "96d9632f363564cc3032521409cf22a852f2032eec099ed5967c0d000cec607a"
*   <li>Last name "Doe": "799ef92a11af918e3fb741df42934f3b568ed2d93ac1df74f1b8d41a27932a6f"
* </ul>
*/
public final class HashExample {

  private HashExample() {}

  public static String hash(String token) {
    // Normalizes and hashes the input token.
    String formattedToken = Ascii.toLowerCase(token).strip();
    return Hashing.sha256().hashString(formattedToken, UTF_8).toString();
  }

  public static void printHash(String token) {
    // Calculates and prints the token's hash.
    System.out.printf("Hash: \"%s\"\t(Token: %s)\n", hash(token), token);
  }

  public static void main(String[] args) {
    // Executes hash calculations and prints results for sample tokens.
    printHash("[email protected]");
    printHash("+18005551212");
    printHash("John");
    printHash("Doe");
  }
}

package updm.hashing;

import static java.nio.charset.StandardCharsets.UTF_8;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Base64;

/**
* Example of the hashing algorithm.
*
* <p>Sample hashes:
*
* <ul>
*   <li>Email '[email protected]': h5JGBrQTGorO7q6IaFMfu5cSqqB6XTp1aybOD11spnQ=
*   <li>Phone '+18005551212': YdkRG+0+bZz8G8O1yzWkAmh8TxVGvuBhor1ET73WTEQ=
*   <li>First name 'John': ltljLzY1ZMwwMlIUCc8iqFLyAy7sCZ7VlnwNAAzsYHo=
*   <li>Last name 'Doe': eZ75KhGvkY4/t0HfQpNPO1aO0tk6wd908bjUGieTKm8=
* </ul>
*/
public final class HashExample {

private HashExample() {}

public static String hash(String token) {
  // Normalizes and hashes the input token using SHA-256 and Base64 encoding.
  String formattedToken = token.toLowerCase().strip();

  byte[] hash;
  try {
    hash = MessageDigest.getInstance("SHA-256").digest(formattedToken.getBytes(UTF_8));
  } catch (NoSuchAlgorithmException e) {
    throw new IllegalStateException("SHA-256 not supported", e);
  }

  return Base64.getEncoder().encodeToString(hash);
}

public static void printHash(String token) {
  // Calculates and prints the hash for the given token.
  System.out.printf("Hash: \"%s\"\t(Token: %s)\n", hash(token), token);
}

public static void main(String[] args) {
  // Executes hash calculations and prints results for sample tokens.
  printHash("[email protected]");
  printHash("+18005551212");
  printHash("John");
  printHash("Doe");
}
}

/*
Provides the hashing algorithm, as well as some valid hashes of sample data for testing.

The following code uses Google Standard SQL and can be run on BigQuery to generate match tables from unhashed data.

Sample hashes:

  - Email '[email protected]': 87924606b4131a8aceeeae8868531fbb9712aaa07a5d3a756b26ce0f5d6ca674
  - Phone '+18005551212':   61d9111bed3e6d9cfc1bc3b5cb35a402687c4f1546bee061a2bd444fbdd64c44
  - First name 'John':      96d9632f363564cc3032521409cf22a852f2032eec099ed5967c0d000cec607a
  - Last name 'Doe':        799ef92a11af918e3fb741df42934f3b568ed2d93ac1df74f1b8d41a27932a6f

The unhashed input table schema is assumed to be:

- Column name: UserID, Type: String
- Column name: Email, Type: String
- Column name: Phone, Type: String
- Column name: FirstName, Type: String
- Column name: LastName, Type: String
- Column name: PostalCode, Type: String
- Column name: CountryCode, Type: String
*/

-- Creates a new table with hashed versions of specified columns from the input table.
CREATE TABLE `your_project_name.your_dataset_name.output_hashed_table_name`
AS
SELECT
  UserID,
  TO_HEX(SHA256(LOWER(Email))) AS Email,
  TO_HEX(SHA256(Phone)) AS Phone,
  TO_HEX(SHA256(LOWER(FirstName))) AS FirstName,
  TO_HEX(SHA256(LOWER(LastName))) AS LastName,
  PostalCode,
  CountryCode,
FROM
  `your_project_name.your_dataset_name.input_unhashed_table_name`;

/*
Provides the hashing algorithm, as well as some valid hashes of sample data for testing.

The following code uses Google Standard SQL and can be run on BigQuery to generate match tables from unhashed data.

Sample hashes:

  - Email '[email protected]': h5JGBrQTGorO7q6IaFMfu5cSqqB6XTp1aybOD11spnQ=
  - Phone '+18005551212':   YdkRG+0+bZz8G8O1yzWkAmh8TxVGvuBhor1ET73WTEQ=
  - First name 'John':      ltljLzY1ZMwwMlIUCc8iqFLyAy7sCZ7VlnwNAAzsYHo=
  - Last name 'Doe':        eZ75KhGvkY4/t0HfQpNPO1aO0tk6wd908bjUGieTKm8=

The unhashed input table schema is assumed to be:

- Column name: UserID, Type: String
- Column name: Email, Type: String
- Column name: Phone, Type: String
- Column name: FirstName, Type: String
- Column name: LastName, Type: String
- Column name: PostalCode, Type: String
- Column name: CountryCode, Type: String
*/

-- Creates a new table with Base64-encoded SHA-256 hashes of specified columns.
CREATE TABLE `your_project_name.your_dataset_name.output_hashed_table_name`
AS
SELECT
  UserID,
  TO_BASE64(SHA256(LOWER(Email))) AS Email,
  TO_BASE64(SHA256(Phone)) AS Phone,
  TO_BASE64(SHA256(LOWER(FirstName))) AS FirstName,
  TO_BASE64(SHA256(LOWER(LastName))) AS LastName,
  PostalCode,
  CountryCode,
FROM
  `your_project_name.your_dataset_name.input_unhashed_table_name`;