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Reference https://github.com/bitcoin/bips/blob/master/bip-0066.mediawiki\n// Format: 0x30 [total-length] 0x02 [R-length] [R] 0x02 [S-length] [S]\n// NOTE: SIGHASH byte ignored AND restricted, truncate before use\n\nvar Buffer = require('safe-buffer').Buffer\n\nfunction check (buffer) {\n  if (buffer.length < 8) return false\n  if (buffer.length > 72) return false\n  if (buffer[0] !== 0x30) return false\n  if (buffer[1] !== buffer.length - 2) return false\n  if (buffer[2] !== 0x02) return false\n\n  var lenR = buffer[3]\n  if (lenR === 0) return false\n  if (5 + lenR >= buffer.length) return false\n  if (buffer[4 + lenR] !== 0x02) return false\n\n  var lenS = buffer[5 + lenR]\n  if (lenS === 0) return false\n  if ((6 + lenR + lenS) !== buffer.length) return false\n\n  if (buffer[4] & 0x80) return false\n  if (lenR > 1 && (buffer[4] === 0x00) && !(buffer[5] & 0x80)) return false\n\n  if (buffer[lenR + 6] & 0x80) return false\n  if (lenS > 1 && (buffer[lenR + 6] === 0x00) && !(buffer[lenR 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Error('R value excessively padded')\n\n  if (buffer[lenR + 6] & 0x80) throw new Error('S value is negative')\n  if (lenS > 1 && (buffer[lenR + 6] === 0x00) && !(buffer[lenR + 7] & 0x80)) throw new Error('S value excessively padded')\n\n  // non-BIP66 - extract R, S values\n  return {\n    r: buffer.slice(4, 4 + lenR),\n    s: buffer.slice(6 + lenR)\n  }\n}\n\n/*\n * Expects r and s to be positive DER integers.\n *\n * The DER format uses the most significant bit as a sign bit (& 0x80).\n * If the significant bit is set AND the integer is positive, a 0x00 is prepended.\n *\n * Examples:\n *\n *      0 =>     0x00\n *      1 =>     0x01\n *     -1 =>     0xff\n *    127 =>     0x7f\n *   -127 =>     0x81\n *    128 =>   0x0080\n *   -128 =>     0x80\n *    255 =>   0x00ff\n *   -255 =>   0xff01\n *  16300 =>   0x3fac\n * -16300 =>   0xc054\n *  62300 => 0x00f35c\n * -62300 => 0xff0ca4\n*/\nfunction encode (r, s) {\n  var lenR = r.length\n  var lenS = s.length\n  if (lenR === 0) throw new 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