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qwen/nodejs/node_modules/pg/lib/crypto/cert-signatures.js

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+function x509Error(msg, cert) {
+  return new Error('SASL channel binding: ' + msg + ' when parsing public certificate ' + cert.toString('base64'))
+}
+
+function readASN1Length(data, index) {
+  let length = data[index++]
+  if (length < 0x80) return { length, index }
+
+  const lengthBytes = length & 0x7f
+  if (lengthBytes > 4) throw x509Error('bad length', data)
+
+  length = 0
+  for (let i = 0; i < lengthBytes; i++) {
+    length = (length << 8) | data[index++]
+  }
+
+  return { length, index }
+}
+
+function readASN1OID(data, index) {
+  if (data[index++] !== 0x6) throw x509Error('non-OID data', data) // 6 = OID
+
+  const { length: OIDLength, index: indexAfterOIDLength } = readASN1Length(data, index)
+  index = indexAfterOIDLength
+  const lastIndex = index + OIDLength
+
+  const byte1 = data[index++]
+  let oid = ((byte1 / 40) >> 0) + '.' + (byte1 % 40)
+
+  while (index < lastIndex) {
+    // loop over numbers in OID
+    let value = 0
+    while (index < lastIndex) {
+      // loop over bytes in number
+      const nextByte = data[index++]
+      value = (value << 7) | (nextByte & 0x7f)
+      if (nextByte < 0x80) break
+    }
+    oid += '.' + value
+  }
+
+  return { oid, index }
+}
+
+function expectASN1Seq(data, index) {
+  if (data[index++] !== 0x30) throw x509Error('non-sequence data', data) // 30 = Sequence
+  return readASN1Length(data, index)
+}
+
+function signatureAlgorithmHashFromCertificate(data, index) {
+  // read this thread: https://www.postgresql.org/message-id/17760-b6c61e752ec07060%40postgresql.org
+  if (index === undefined) index = 0
+  index = expectASN1Seq(data, index).index
+  const { length: certInfoLength, index: indexAfterCertInfoLength } = expectASN1Seq(data, index)
+  index = indexAfterCertInfoLength + certInfoLength // skip over certificate info
+  index = expectASN1Seq(data, index).index // skip over signature length field
+  const { oid, index: indexAfterOID } = readASN1OID(data, index)
+  switch (oid) {
+    // RSA
+    case '1.2.840.113549.1.1.4':
+      return 'MD5'
+    case '1.2.840.113549.1.1.5':
+      return 'SHA-1'
+    case '1.2.840.113549.1.1.11':
+      return 'SHA-256'
+    case '1.2.840.113549.1.1.12':
+      return 'SHA-384'
+    case '1.2.840.113549.1.1.13':
+      return 'SHA-512'
+    case '1.2.840.113549.1.1.14':
+      return 'SHA-224'
+    case '1.2.840.113549.1.1.15':
+      return 'SHA512-224'
+    case '1.2.840.113549.1.1.16':
+      return 'SHA512-256'
+    // ECDSA
+    case '1.2.840.10045.4.1':
+      return 'SHA-1'
+    case '1.2.840.10045.4.3.1':
+      return 'SHA-224'
+    case '1.2.840.10045.4.3.2':
+      return 'SHA-256'
+    case '1.2.840.10045.4.3.3':
+      return 'SHA-384'
+    case '1.2.840.10045.4.3.4':
+      return 'SHA-512'
+    // RSASSA-PSS: hash is indicated separately
+    case '1.2.840.113549.1.1.10': {
+      index = indexAfterOID
+      index = expectASN1Seq(data, index).index
+      if (data[index++] !== 0xa0) throw x509Error('non-tag data', data) // a0 = constructed tag 0
+      index = readASN1Length(data, index).index // skip over tag length field
+      index = expectASN1Seq(data, index).index // skip over sequence length field
+      const { oid: hashOID } = readASN1OID(data, index)
+      switch (hashOID) {
+        // standalone hash OIDs
+        case '1.2.840.113549.2.5':
+          return 'MD5'
+        case '1.3.14.3.2.26':
+          return 'SHA-1'
+        case '2.16.840.1.101.3.4.2.1':
+          return 'SHA-256'
+        case '2.16.840.1.101.3.4.2.2':
+          return 'SHA-384'
+        case '2.16.840.1.101.3.4.2.3':
+          return 'SHA-512'
+      }
+      throw x509Error('unknown hash OID ' + hashOID, data)
+    }
+    // Ed25519 -- see https: return//github.com/openssl/openssl/issues/15477
+    case '1.3.101.110':
+    case '1.3.101.112': // ph
+      return 'SHA-512'
+    // Ed448 -- still not in pg 17.2 (if supported, digest would be SHAKE256 x 64 bytes)
+    case '1.3.101.111':
+    case '1.3.101.113': // ph
+      throw x509Error('Ed448 certificate channel binding is not currently supported by Postgres')
+  }
+  throw x509Error('unknown OID ' + oid, data)
+}
+
+module.exports = { signatureAlgorithmHashFromCertificate }