之前在RSA PKCS1和PKCS8的ASN格式一文里，我們已經分析過了PKCS1和PKCS8格式的密鑰了

那么，我們現在就做一個c#通用的解析代碼，即能解析PKCS1的密鑰，也能解析PKCS8的密鑰

public static partial class Encryption{public static class AsnParser{public static RSAParameters ParseRSAPrivateKey(byte[] bt){RSAParameters rsap = new RSAParameters();// Initial valueList<byte> octets = new List<byte>();octets.AddRange(bt);int initialCount = bt.Length;// Current valuebyte[] value = null;// Checkpointint position = CurrentPosition(initialCount, octets);// Sanity Checkint length = 0;byte b = 0;length = NextSequence(ref initialCount, ref octets, out b);if (length != RemainingBytes(octets)){StringBuilder sb = new StringBuilder("Incorrect Sequence Size. ");sb.AppendFormat("Specified: {0}, Remaining: {1}",length.ToString(CultureInfo.InvariantCulture), RemainingBytes(octets).ToString(CultureInfo.InvariantCulture));//throw new BerDecodeException(sb.ToString(), position);throw new Exception(sb.ToString());}// Checkpointposition = CurrentPosition(initialCount, octets);// Versionvalue = NextInteger(ref initialCount, ref octets);if (0x00 != value[0]){StringBuilder sb = new StringBuilder("Incorrect PrivateKeyInfo Version. ");BigInteger v = new BigInteger(value);sb.AppendFormat("Expected: 0, Specified: {0}", v.ToString(10));//throw new BerDecodeException(sb.ToString(), position);throw new Exception(sb.ToString());}// Checkpointposition = CurrentPosition(initialCount, octets);// Ignore Sequence - AlgorithmIdentifierlength = NextSequence(ref initialCount, ref octets, out b);if (0x30 == b) // PKCS8{if (length > RemainingBytes(octets)){StringBuilder sb = new StringBuilder("Incorrect AlgorithmIdentifier Size. ");sb.AppendFormat("Specified: {0}, Remaining: {1}",length.ToString(CultureInfo.InvariantCulture),RemainingBytes(octets).ToString(CultureInfo.InvariantCulture));//throw new BerDecodeException(sb.ToString(), position);throw new Exception(sb.ToString());}// Checkpointposition = CurrentPosition(initialCount, octets);// Grab the OIDvalue = NextOID(ref initialCount, ref octets);byte[] oid = { 0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d, 0x01, 0x01, 0x01 };if (!EqualOid(value, oid)){//throw new BerDecodeException("Expected OID 1.2.840.113549.1.1.1", position);throw new Exception("Expected OID 1.2.840.113549.1.1.1");}// Optional Parametersif (IsNextNull(octets)){NextNull(ref initialCount, ref octets);// Also OK: value = parser.Next();}else{// Gracefully skip the optional datavalue = Next(ref initialCount, ref octets);}// Checkpointposition = CurrentPosition(initialCount, octets);// Ignore OctetString - PrivateKeylength = NextOctetString(ref initialCount, ref octets);if (length > RemainingBytes(octets)){StringBuilder sb = new StringBuilder("Incorrect PrivateKey Size. ");sb.AppendFormat("Specified: {0}, Remaining: {1}",length.ToString(CultureInfo.InvariantCulture),RemainingBytes(octets).ToString(CultureInfo.InvariantCulture));//throw new BerDecodeException(sb.ToString(), position);throw new Exception(sb.ToString());}// Checkpointposition = CurrentPosition(initialCount, octets);// Ignore Sequence - RSAPrivateKeylength = NextSequence(ref initialCount, ref octets, out b);if (length < RemainingBytes(octets)){StringBuilder sb = new StringBuilder("Incorrect RSAPrivateKey Size. ");sb.AppendFormat("Specified: {0}, Remaining: {1}",length.ToString(CultureInfo.InvariantCulture),RemainingBytes(octets).ToString(CultureInfo.InvariantCulture));//throw new BerDecodeException(sb.ToString(), position);throw new Exception(sb.ToString());}// Checkpointposition = CurrentPosition(initialCount, octets);// Versionvalue = NextInteger(ref initialCount, ref octets);if (0x00 != value[0]){StringBuilder sb = new StringBuilder("Incorrect RSAPrivateKey Version. ");BigInteger v = new BigInteger(value);sb.AppendFormat("Expected: 0, Specified: {0}", v.ToString(10));//throw new BerDecodeException(sb.ToString(), position);throw new Exception(sb.ToString());}rsap.Modulus = TrimLeadingZero(NextInteger(ref initialCount, ref octets));rsap.Exponent = TrimLeadingZero(NextInteger(ref initialCount, ref octets));rsap.D = TrimLeadingZero(NextInteger(ref initialCount, ref octets));rsap.P = TrimLeadingZero(NextInteger(ref initialCount, ref octets));rsap.Q = TrimLeadingZero(NextInteger(ref initialCount, ref octets));rsap.DP = TrimLeadingZero(NextInteger(ref initialCount, ref octets));rsap.DQ = TrimLeadingZero(NextInteger(ref initialCount, ref octets));rsap.InverseQ = TrimLeadingZero(NextInteger(ref initialCount, ref octets));}if (0x02 == b) // PKCS1{rsap.Modulus = TrimLeadingZero(GetOctets(ref initialCount, ref octets, length));rsap.Exponent = TrimLeadingZero(GetOctets(ref initialCount, ref octets, NextSequence(ref initialCount, ref octets, out b)));rsap.D = TrimLeadingZero(GetOctets(ref initialCount, ref octets, NextSequence(ref initialCount, ref octets, out b)));rsap.P = TrimLeadingZero(GetOctets(ref initialCount, ref octets, NextSequence(ref initialCount, ref octets, out b)));rsap.Q = TrimLeadingZero(GetOctets(ref initialCount, ref octets, NextSequence(ref initialCount, ref octets, out b)));rsap.DP = TrimLeadingZero(GetOctets(ref initialCount, ref octets, NextSequence(ref initialCount, ref octets, out b)));rsap.DQ = TrimLeadingZero(GetOctets(ref initialCount, ref octets, NextSequence(ref initialCount, ref octets, out b)));rsap.InverseQ = TrimLeadingZero(GetOctets(ref initialCount, ref octets, NextSequence(ref initialCount, ref octets, out b)));}return rsap;}public static RSAParameters ParseRSAPublicKey(byte[] bt){RSAParameters rsap = new RSAParameters();// Initial valueList<byte> octets = new List<byte>();octets.AddRange(bt);int initialCount = bt.Length;byte b = 0;// Current valuebyte[] value = null;// Sanity Checkint length = 0;// Checkpointint position = CurrentPosition(initialCount, octets);// Ignore Sequence - PublicKeyInfolength = NextSequence(ref initialCount, ref octets, out b);if (length != RemainingBytes(octets)){StringBuilder sb = new StringBuilder("Incorrect Sequence Size. ");sb.AppendFormat("Specified: {0}, Remaining: {1}",length.ToString(CultureInfo.InvariantCulture),RemainingBytes(octets).ToString(CultureInfo.InvariantCulture));//throw new BerDecodeException(sb.ToString(), position);throw new Exception(sb.ToString());}// Checkpointposition = CurrentPosition(initialCount, octets);// Ignore Sequence - AlgorithmIdentifierlength = NextSequence(ref initialCount, ref octets, out b);if (length > RemainingBytes(octets)){StringBuilder sb = new StringBuilder("Incorrect AlgorithmIdentifier Size. ");sb.AppendFormat("Specified: {0}, Remaining: {1}",length.ToString(CultureInfo.InvariantCulture),RemainingBytes(octets).ToString(CultureInfo.InvariantCulture));//throw new BerDecodeException(sb.ToString(), position);throw new Exception(sb.ToString());}// Checkpointposition = CurrentPosition(initialCount, octets);// Grab the OIDvalue = NextOID(ref initialCount, ref octets);byte[] oid = { 0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d, 0x01, 0x01, 0x01 };if (!EqualOid(value, oid)){//throw new BerDecodeException("Expected OID 1.2.840.113549.1.1.1", position);throw new Exception("Expected OID 1.2.840.113549.1.1.1");}// Optional Parametersif (IsNextNull(octets)){NextNull(ref initialCount, ref octets);// Also OK: value = parser.Next();}else{// Gracefully skip the optional datavalue = Next(ref initialCount, ref octets);}// Checkpointposition = CurrentPosition(initialCount, octets);// Ignore BitString - PublicKeylength = NextBitString(ref initialCount, ref octets);if (length > RemainingBytes(octets)){StringBuilder sb = new StringBuilder("Incorrect PublicKey Size. ");sb.AppendFormat("Specified: {0}, Remaining: {1}",length.ToString(CultureInfo.InvariantCulture),(RemainingBytes(octets)).ToString(CultureInfo.InvariantCulture));//throw new BerDecodeException(sb.ToString(), position);throw new Exception(sb.ToString());}// Checkpointposition = CurrentPosition(initialCount, octets);// Ignore Sequence - RSAPublicKeylength = NextSequence(ref initialCount, ref octets, out b);if (length < RemainingBytes(octets)){StringBuilder sb = new StringBuilder("Incorrect RSAPublicKey Size. ");sb.AppendFormat("Specified: {0}, Remaining: {1}",length.ToString(CultureInfo.InvariantCulture),RemainingBytes(octets).ToString(CultureInfo.InvariantCulture));//throw new BerDecodeException(sb.ToString(), position);throw new Exception(sb.ToString());}rsap.Modulus = TrimLeadingZero(NextInteger(ref initialCount, ref octets));rsap.Exponent = TrimLeadingZero(NextInteger(ref initialCount, ref octets));return rsap;}public static byte[] ExportRSAPrivateKey(RSAParameters rp, RSA.PaddingType padding){int count = 0;List<byte[]> bytes = new List<byte[]>();bytes.Add(rp.InverseQ);count += bytes[bytes.Count - 1].Length;bytes.Add(new byte[] { 2, 129, 128 });count += bytes[bytes.Count - 1].Length;bytes.Add(rp.DQ);count += bytes[bytes.Count - 1].Length;bytes.Add(new byte[] { 2, 129, 128 });count += bytes[bytes.Count - 1].Length;bytes.Add(rp.DP);count += bytes[bytes.Count - 1].Length;bytes.Add(new byte[] { 2, 129, 128 });count += bytes[bytes.Count - 1].Length;bytes.Add(rp.Q);count += bytes[bytes.Count - 1].Length;bytes.Add(new byte[] { 2, 129, 128 });count += bytes[bytes.Count - 1].Length;bytes.Add(rp.P);count += bytes[bytes.Count - 1].Length;bytes.Add(new byte[] { 2, 129, 128 });count += bytes[bytes.Count - 1].Length;bytes.Add(rp.D);count += bytes[bytes.Count - 1].Length;bytes.Add(new byte[] { 2, 130, 1, 0 });count += bytes[bytes.Count - 1].Length;bytes.Add(rp.Exponent);count += bytes[bytes.Count - 1].Length;bytes.Add(new byte[] { 2, 3 });count += bytes[bytes.Count - 1].Length;bytes.Add(rp.Modulus);count += bytes[bytes.Count - 1].Length;bytes.Add(new byte[] { 2, 130, 1, 0 });count += bytes[bytes.Count - 1].Length;switch (padding){case RSA.PaddingType.PKCS1:break;case RSA.PaddingType.PKCS8:bytes.Add(new byte[] { 2, 1, 0 });count += bytes[bytes.Count - 1].Length;bytes.Add(IntToByte(count));count += bytes[bytes.Count - 1].Length;bytes.Add(new byte[] { 48, 130 });count += bytes[bytes.Count - 1].Length;bytes.Add(IntToByte(count));count += bytes[bytes.Count - 1].Length;bytes.Add(new byte[] { 48, 13, 6, 9, 42, 134, 72, 134, 247, 13, 1, 1, 1, 5, 0, 4, 130 });count += bytes[bytes.Count - 1].Length;break;default:throw new Exception("Invalid RSA PaddingType");}bytes.Add(new byte[] { 2, 1, 0 });count += bytes[bytes.Count - 1].Length;bytes.Add(IntToByte(count));count += bytes[bytes.Count - 1].Length;bytes.Add(new byte[] { 48, 130 });count += bytes[bytes.Count - 1].Length;byte[] result = new byte[count];int cur = 0;for (var i = 0; i < bytes.Count; i++){Array.Copy(bytes[i], 0, result, count - bytes[i].Length - cur, bytes[i].Length);cur += bytes[i].Length;}return result;}public static byte[] ExportRSAPublicKey(RSAParameters rp){int count = 0;List<byte[]> bytes = new List<byte[]>();bytes.Add(rp.Exponent);count += bytes[bytes.Count - 1].Length;bytes.Add(new byte[] { 2, 3 });count += bytes[bytes.Count - 1].Length;bytes.Add(rp.Modulus);count += bytes[bytes.Count - 1].Length;bytes.Add(new byte[] { 2, 130, 1, 1, 0 });count += bytes[bytes.Count - 1].Length;bytes.Add(IntToByte(count));count += bytes[bytes.Count - 1].Length;bytes.Add(new byte[] { 48, 130 });count += bytes[bytes.Count - 1].Length;bytes.Add(new byte[] { 0 });count += bytes[bytes.Count - 1].Length;bytes.Add(IntToByte(count));count += bytes[bytes.Count - 1].Length;bytes.Add(new byte[] { 48, 13, 6, 9, 42, 134, 72, 134, 247, 13, 1, 1, 1, 5, 0, 3, 130 });count += bytes[bytes.Count - 1].Length;bytes.Add(IntToByte(count));count += bytes[bytes.Count - 1].Length;bytes.Add(new byte[] { 48, 130 });count += bytes[bytes.Count - 1].Length;byte[] result = new byte[count];int cur = 0;for (var i = 0; i < bytes.Count; i++){Array.Copy(bytes[i], 0, result, count - bytes[i].Length - cur, bytes[i].Length);cur += bytes[i].Length;}return result;}private static byte[] IntToByte(int i){if (i < 256){return new byte[] { (byte)i };}string h = i.ToString("x");MatchCollection mc = RegexExpand.Matches(h, @"[a-f0-9]{1,2}(?=([a-f0-9]{2})*$)", RegexOptions.IgnoreCase);List<byte> result = new List<byte>();for (int ii = 0; ii < mc.Count; ii++){result.Add((byte)Convert.ToInt16(mc[ii].Value, 16));}return result.ToArray();}private static byte[] TrimLeadingZero(byte[] values){byte[] r = null;if ((0x00 == values[0]) && (values.Length > 1)){r = new byte[values.Length - 1];Array.Copy(values, 1, r, 0, values.Length - 1);}else{r = new byte[values.Length];Array.Copy(values, r, values.Length);}return r;}private static int NextBitString(ref int initialCount, ref List<byte> octets){int position = CurrentPosition(initialCount, octets);try{byte b = GetNextOctet(ref initialCount, ref octets);if (0x03 != b){StringBuilder sb = new StringBuilder("Expected Bit String. ");sb.AppendFormat("Specified Identifier: {0}", b.ToString(CultureInfo.InvariantCulture));//throw new BerDecodeException(sb.ToString(), position);throw new Exception(sb.ToString());}int length = GetLength(ref initialCount, ref octets);// We need to consume unused bits, which is the first// octet of the remaing valuesb = octets[0];octets.RemoveAt(0);length--;if (0x00 != b){//throw new BerDecodeException("The first octet of BitString must be 0", position);throw new Exception("The first octet of BitString must be 0");}return length;}catch (ArgumentOutOfRangeException ex){//throw new BerDecodeException("Error Parsing Key", position, ex);throw ex;}}private static int NextOctetString(ref int initialCount, ref List<byte> octets){int position = CurrentPosition(initialCount, octets);try{byte b = GetNextOctet(ref initialCount, ref octets);if (0x04 != b){StringBuilder sb = new StringBuilder("Expected Octet String. ");sb.AppendFormat("Specified Identifier: {0}", b.ToString(CultureInfo.InvariantCulture));//throw new BerDecodeException(sb.ToString(), position);throw new Exception(sb.ToString());}int length = GetLength(ref initialCount, ref octets);if (length > RemainingBytes(octets)){StringBuilder sb = new StringBuilder("Incorrect Octet String Size. ");sb.AppendFormat("Specified: {0}, Remaining: {1}",length.ToString(CultureInfo.InvariantCulture),RemainingBytes(octets).ToString(CultureInfo.InvariantCulture));//throw new BerDecodeException(sb.ToString(), position);throw new Exception(sb.ToString());}return length;}catch (ArgumentOutOfRangeException ex){//throw new BerDecodeException("Error Parsing Key", position, ex);throw ex;}}private static byte[] Next(ref int initialCount, ref List<byte> octets){int position = CurrentPosition(initialCount, octets);try{byte b = GetNextOctet(ref initialCount, ref octets);int length = GetLength(ref initialCount, ref octets);if (length > RemainingBytes(octets)){StringBuilder sb = new StringBuilder("Incorrect Size. ");sb.AppendFormat("Specified: {0}, Remaining: {1}",length.ToString(CultureInfo.InvariantCulture),RemainingBytes(octets).ToString(CultureInfo.InvariantCulture));//throw new BerDecodeException(sb.ToString(), position);throw new Exception(sb.ToString());}return GetOctets(ref initialCount, ref octets, length);}catch (ArgumentOutOfRangeException ex){//throw new BerDecodeException("Error Parsing Key", position, ex);throw ex;}}private static int NextNull(ref int initialCount, ref List<byte> octets){int position = CurrentPosition(initialCount, octets);try{byte b = GetNextOctet(ref initialCount, ref octets);if (0x05 != b){StringBuilder sb = new StringBuilder("Expected Null. ");sb.AppendFormat("Specified Identifier: {0}", b.ToString(CultureInfo.InvariantCulture));//throw new BerDecodeException(sb.ToString(), position);throw new Exception(sb.ToString());}// Next octet must be 0b = GetNextOctet(ref initialCount, ref octets);if (0x00 != b){StringBuilder sb = new StringBuilder("Null has non-zero size. ");sb.AppendFormat("Size: {0}", b.ToString(CultureInfo.InvariantCulture));//throw new BerDecodeException(sb.ToString(), position);throw new Exception(sb.ToString());}return 0;}catch (ArgumentOutOfRangeException ex){//throw new BerDecodeException("Error Parsing Key", position, ex);throw ex;}}private static bool IsNextNull(List<byte> octets){return 0x05 == octets[0];}private static bool EqualOid(byte[] first, byte[] second){if (first.Length != second.Length) { return false; }for (int i = 0; i < first.Length; i++){if (first[i] != second[i]) { return false; }}return true;}private static byte[] NextOID(ref int initialCount, ref List<byte> octets){int position = CurrentPosition(initialCount, octets);try{byte b = GetNextOctet(ref initialCount, ref octets);if (0x06 != b){StringBuilder sb = new StringBuilder("Expected Object Identifier. ");sb.AppendFormat("Specified Identifier: {0}",b.ToString(CultureInfo.InvariantCulture));//throw new BerDecodeException(sb.ToString(), position);throw new Exception(sb.ToString());}int length = GetLength(ref initialCount, ref octets);if (length > RemainingBytes(octets)){StringBuilder sb = new StringBuilder("Incorrect Object Identifier Size. ");sb.AppendFormat("Specified: {0}, Remaining: {1}",length.ToString(CultureInfo.InvariantCulture),RemainingBytes(octets).ToString(CultureInfo.InvariantCulture));//throw new BerDecodeException(sb.ToString(), position);throw new Exception(sb.ToString());}byte[] values = new byte[length];for (int i = 0; i < length; i++){values[i] = octets[0];octets.RemoveAt(0);}return values;}catch (ArgumentOutOfRangeException ex){//throw new BerDecodeException("Error Parsing Key", position, ex);throw ex;}}private static byte[] NextInteger(ref int initialCount, ref List<byte> octets){int position = CurrentPosition(initialCount, octets);try{byte b = GetNextOctet(ref initialCount, ref octets);if (0x02 != b){StringBuilder sb = new StringBuilder("Expected Integer. ");sb.AppendFormat("Specified Identifier: {0}", b.ToString(CultureInfo.InvariantCulture));//throw new BerDecodeException(sb.ToString(), position);throw new Exception(sb.ToString());}int length = GetLength(ref initialCount, ref octets);if (length > RemainingBytes(octets)){StringBuilder sb = new StringBuilder("Incorrect Integer Size. ");sb.AppendFormat("Specified: {0}, Remaining: {1}",length.ToString(CultureInfo.InvariantCulture),RemainingBytes(octets).ToString(CultureInfo.InvariantCulture));//throw new BerDecodeException(sb.ToString(), position);throw new Exception(sb.ToString());}return GetOctets(ref initialCount, ref octets, length);}catch (ArgumentOutOfRangeException ex){//throw new BerDecodeException("Error Parsing Key", position, ex);throw ex;}}private static int CurrentPosition(int initialCount, List<byte> octets){return initialCount - octets.Count;}private static int RemainingBytes(List<byte> octets){return octets.Count;}private static byte[] GetOctets(ref int initialCount, ref List<byte> octets, int octetCount){int position = CurrentPosition(initialCount, octets);if (octetCount > RemainingBytes(octets)){StringBuilder sb = new StringBuilder("Incorrect Size. ");sb.AppendFormat("Specified: {0}, Remaining: {1}",octetCount.ToString(CultureInfo.InvariantCulture),RemainingBytes(octets).ToString(CultureInfo.InvariantCulture));//throw new BerDecodeException(sb.ToString(), position);throw new Exception(sb.ToString());}byte[] values = new byte[octetCount];try{octets.CopyTo(0, values, 0, octetCount);octets.RemoveRange(0, octetCount);}catch (ArgumentOutOfRangeException ex){//throw new BerDecodeException("Error Parsing Key", position, ex);throw ex;}return values;}private static byte GetNextOctet(ref int initialCount, ref List<byte> octets){int position = CurrentPosition(initialCount, octets);if (0 == RemainingBytes(octets)){StringBuilder sb = new StringBuilder("Incorrect Size. ");sb.AppendFormat("Specified: {0}, Remaining: {1}",1.ToString(CultureInfo.InvariantCulture),RemainingBytes(octets).ToString(CultureInfo.InvariantCulture));//throw new BerDecodeException(sb.ToString(), position);throw new Exception(sb.ToString());}byte b = GetOctets(ref initialCount, ref octets, 1)[0];return b;}private static int GetLength(ref int initialCount, ref List<byte> octets){int length = 0;// Checkpointint position = CurrentPosition(initialCount, octets);try{byte b = GetNextOctet(ref initialCount, ref octets);if (b == (b & 0x7f)) { return b; }int i = b & 0x7f;if (i > 4){StringBuilder sb = new StringBuilder("Invalid Length Encoding. ");sb.AppendFormat("Length uses {0} octets",i.ToString(CultureInfo.InvariantCulture));//throw new BerDecodeException(sb.ToString(), position);throw new Exception(sb.ToString());}while (0 != i--){// shift leftlength <<= 8;length |= GetNextOctet(ref initialCount, ref octets);}}catch (ArgumentOutOfRangeException ex){//throw new BerDecodeException("Error Parsing Key", position, ex);throw ex;}return length;}private static int NextSequence(ref int initialCount, ref List<byte> octets, out byte b){int position = CurrentPosition(initialCount, octets);try{b = GetNextOctet(ref initialCount, ref octets);int length = 0;if (0x30 == b) // PKCS8{length = GetLength(ref initialCount, ref octets);if (length > RemainingBytes(octets)){StringBuilder sb = new StringBuilder("Incorrect Sequence Size. ");sb.AppendFormat("Specified: {0}, Remaining: {1}",length.ToString(CultureInfo.InvariantCulture),RemainingBytes(octets).ToString(CultureInfo.InvariantCulture));//throw new BerDecodeException(sb.ToString(), position);throw new Exception(sb.ToString());}}if (0x02 == b) // PKCS1{byte x = GetOctets(ref initialCount, ref octets, 1)[0];if (x == 0x81){length = GetOctets(ref initialCount, ref octets, 1)[0];}else if (x == 0x82){byte h = GetOctets(ref initialCount, ref octets, 1)[0];byte l = GetOctets(ref initialCount, ref octets, 1)[0];byte[] m = { l, h, 0x00, 0x00 };length = BitConverter.ToInt32(m, 0);//length = h<<8|l;}else{length = x;}while (octets[0] == 0x00){GetOctets(ref initialCount, ref octets, 1);length--;}}if (length == 0){StringBuilder sb = new StringBuilder("Expected Sequence. ");sb.AppendFormat("Specified Identifier: {0}",b.ToString(CultureInfo.InvariantCulture));//throw new BerDecodeException(sb.ToString(), position);throw new Exception(sb.ToString());}return length;}catch (ArgumentOutOfRangeException ex){//throw new BerDecodeException("Error Parsing Key", position, ex);throw ex;}}}}

調用方法也很簡單

string base64 = FileHelper.FileToString(fi.FullName); if (Regex.IsMatch(base64, @"^[-]+BEGIN")) {base64 = Regex.Match(base64, @"(?<=KEY[-]+[\r\n]+)[\s\S]+(?=[\r\n]+[-]+END)").Value;base64 = Regex.Replace(base64, @"[\r\n]+", ""); } RSACryptoServiceProvider rsa = new RSACryptoServiceProvider(8); rsa.ImportParameters(AsnParser.ParseRSAPrivateKey(Convert.FromBase64String(base64)));

直接從密鑰文件中得到的密鑰數據，掐頭去尾，把回車換行去掉之后轉個碼，然后用AsnParser解析成RSAParameters對象，直接導入

至于PKCS1和PKCS8的區別，則在AsnParser的NextSequence方法中有體現，第八個字節為48，即0x30時，為PKCS8格式，如果第八個字節為2，即0x02時，則為PKCS1，為其他值時，則為驗證數據

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