android sha224与python sha224的区别

您没有正确格式化Android上的十六进制值;前面的0将被删除。

buffer.append(String.format("%02x", 0xFF & digest[i]));

final MessageDigest mDigest = MessageDigest.getInstance("SHA-224");
byte[] messageDigest = mDigest.digest(toEncrypt.getBytes());
final BigInteger number = new BigInteger(1, messageDigest);
final String sha = number.toString(16);
final int diff = 32 - sha.length();
final StringBuilder finalSHA = new StringBuilder(32);
for (int i=0;i<diff;i++) {
 finalSHA.append("0");
}
finalSHA.append(sha);
return finalSHA.toString();

将十六进制转换为字符串,一次两对。第一个零就是 dropped 在23号,一个奇怪的位置。这是一个前导零。必要时需要将转换后的十六进制数字归零。不带BigInteger的替代实现:

MessageDigest sha224 = MessageDigest.getInstance("SHA-224");
sha224.update(key.getBytes());

byte[] digest = sha224.digest();
StringBuffer buffer = new StringBuffer();

for(int i = 0; i < digest.length; i++) {
  String hex_string = Integer.toHexString(0xFF & digest[i]);
  if(hex_string.length()==1) hex_string = "0"+hex_string;
  buffer.append(hex_string);
}

return buffer.toString();