Java Code Examples for com.google.common.hash.HashCode#bits()

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Example 1

Source File: HttpCommonDescriptionArg.java From buck with Apache License 2.0

6 votes

/**
 * Parses a sha256 from a string
 *
 * @param sha256 A hex representation of a sha256 hash
 * @param target The target to use in error messages
 * @return The hash
 * @throws HumanReadableException If the string could not be parsed, or if it's of the wrong
 *     length
 */
static HashCode parseSha256(String sha256, BuildTarget target) throws HumanReadableException {
  HashCode sha256Code;
  try {
    sha256Code = HashCode.fromString(sha256);
  } catch (IllegalArgumentException e) {
    throw new HumanReadableException(
        e,
        "%s when parsing sha256 of %s",
        e.getMessage(),
        target.getUnflavoredBuildTarget().getFullyQualifiedName());
  }

  if (sha256Code.bits() != 256) {
    throw new HumanReadableException(
        "%s does not appear to be a sha256 hash. Expected 256 bits, got %s bits when parsing %s",
        sha256, sha256Code.bits(), target.getUnflavoredBuildTarget().getFullyQualifiedName());
  }
  return sha256Code;
}