.NET使用OpenSSL生成的pem密钥文件

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    using System;      using System.Security.Cryptography;            /// <summary>      /// 作者：http://thinhunan.cnblogs.com      /// 名称：RsaUtility.cs      /// 时间：2014-11-04 16:48:42      /// 描述：将pem格式的1024位或2048位的公钥和私钥转换为RSAParameters      /// </summary>      public class PemConverter      {          /// <summary>          /// 将pem格式公钥(1024 or 2048)转换为RSAParameters          /// </summary>          /// <param name="pemFileConent">pem公钥内容</param>          /// <returns>转换得到的RSAParamenters</returns>          public static RSAParameters ConvertFromPemPublicKey(string pemFileConent)          {              if (string.IsNullOrEmpty(pemFileConent))              {                  throw new ArgumentNullException("pemFileConent", "This arg cann't be empty.");              }              pemFileConent = pemFileConent.Replace("-----BEGIN PUBLIC KEY-----", "").Replace("-----END PUBLIC KEY-----", "").Replace("\n", "").Replace("\r", "");              byte[] keyData = Convert.FromBase64String(pemFileConent);              bool keySize1024 = (keyData.Length == 162);              bool keySize2048 = (keyData.Length == 294);              if (!(keySize1024 || keySize2048))              {                  throw new ArgumentException("pem file content is incorrect, Only support the key size is 1024 or 2048");              }              byte[] pemModulus = (keySize1024 ? new byte[128] : new byte[256]);              var pemPublicExponent = new byte[3];              Array.Copy(keyData, (keySize1024 ? 29 : 33), pemModulus, 0, (keySize1024 ? 128 : 256));              Array.Copy(keyData, (keySize1024 ? 159 : 291), pemPublicExponent, 0, 3);              var para = new RSAParameters { Modulus = pemModulus, Exponent = pemPublicExponent };              return para;          }                /// <summary>          /// 将pem格式私钥(1024 or 2048)转换为RSAParameters          /// </summary>          /// <param name="pemFileConent">pem私钥内容</param>          /// <returns>转换得到的RSAParamenters</returns>          public static RSAParameters ConvertFromPemPrivateKey(string pemFileConent)          {              if (string.IsNullOrEmpty(pemFileConent))              {                  throw new ArgumentNullException("pemFileConent", "This arg cann't be empty.");              }              //pemFileConent = pemFileConent.Replace("-----BEGIN RSA PRIVATE KEY-----", "").Replace("-----END RSA PRIVATE KEY-----", "").Replace("\n", "").Replace("\r", "");              pemFileConent = pemFileConent.Replace("-----BEGIN PRIVATE KEY-----", "").Replace("-----END PRIVATE KEY-----", "").Replace("\n", "").Replace("\r", "");              byte[] keyData = Convert.FromBase64String(pemFileConent);              //byte[] keyData = System.Text.Encoding.Default.GetBytes(pemFileConent);              bool keySize1024 = (keyData.Length == 609 || keyData.Length == 610);              bool keySize2048 = (keyData.Length == 1190 || keyData.Length == 1192);                    if (!(keySize1024 || keySize2048))              {                  throw new ArgumentException("pem file content is incorrect, Only support the key size is 1024 or 2048");              }                    int index = (keySize1024 ? 11 : 12);              byte[] pemModulus = (keySize1024 ? new byte[128] : new byte[256]);              Array.Copy(keyData, index, pemModulus, 0, pemModulus.Length);                    index += pemModulus.Length;              index += 2;              var pemPublicExponent = new byte[3];              Array.Copy(keyData, index, pemPublicExponent, 0, 3);                    index += 3;              index += 4;              if (keyData[index] == 0)              {                  index++;              }              byte[] pemPrivateExponent = (keySize1024 ? new byte[128] : new byte[256]);              Array.Copy(keyData, index, pemPrivateExponent, 0, pemPrivateExponent.Length);                    index += pemPrivateExponent.Length;              index += (keySize1024 ? ((int)keyData[index + 1] == 64 ? 2 : 3) : ((int)keyData[index + 2] == 128 ? 3 : 4));              byte[] pemPrime1 = (keySize1024 ? new byte[64] : new byte[128]);              Array.Copy(keyData, index, pemPrime1, 0, pemPrime1.Length);                    index += pemPrime1.Length;              index += (keySize1024 ? ((int)keyData[index + 1] == 64 ? 2 : 3) : ((int)keyData[index + 2] == 128 ? 3 : 4));              byte[] pemPrime2 = (keySize1024 ? new byte[64] : new byte[128]);              Array.Copy(keyData, index, pemPrime2, 0, pemPrime2.Length);                    index += pemPrime2.Length;              index += (keySize1024 ? ((int)keyData[index + 1] == 64 ? 2 : 3) : ((int)keyData[index + 2] == 128 ? 3 : 4));              byte[] pemExponent1 = (keySize1024 ? new byte[64] : new byte[128]);              Array.Copy(keyData, index, pemExponent1, 0, pemExponent1.Length);                    index += pemExponent1.Length;              index += (keySize1024 ? ((int)keyData[index + 1] == 64 ? 2 : 3) : ((int)keyData[index + 2] == 128 ? 3 : 4));              byte[] pemExponent2 = (keySize1024 ? new byte[64] : new byte[128]);              Array.Copy(keyData, index, pemExponent2, 0, pemExponent2.Length);                    index += pemExponent2.Length;              index += (keySize1024 ? ((int)keyData[index + 1] == 64 ? 2 : 3) : ((int)keyData[index + 2] == 128 ? 3 : 4));              byte[] pemCoefficient = (keySize1024 ? new byte[64] : new byte[128]);              Array.Copy(keyData, index, pemCoefficient, 0, pemCoefficient.Length);                    var para = new RSAParameters                  {                      Modulus = pemModulus,                      Exponent = pemPublicExponent,                      D = pemPrivateExponent,                      P = pemPrime1,                      Q = pemPrime2,                      DP = pemExponent1,                      DQ = pemExponent2,                      InverseQ = pemCoefficient                  };              return para;          }                /// <summary>          /// 将pem格式公钥转换为RSAParameters          /// </summary>          /// <param name="pemFileConent">pem公钥内容</param>          /// <returns>转换得到的RSAParamenters</returns>          public static RSAParameters ConvertFromPemNormalPublicKey(string pemFileConent)          {              if (string.IsNullOrEmpty(pemFileConent))              {                  throw new ArgumentNullException("pemFileConent", "This arg cann't be empty.");              }              pemFileConent = pemFileConent.Replace("-----BEGIN PUBLIC KEY-----", "").Replace("-----END PUBLIC KEY-----", "").Replace("\n", "").Replace("\r", "");              byte[] keyData = Convert.FromBase64String(pemFileConent);              if (keyData.Length < 162)              {                  throw new ArgumentException("pem file content is incorrect.");              }              byte[] pemModulus = new byte[128];              byte[] pemPublicExponent = new byte[3];              Array.Copy(keyData, 29, pemModulus, 0, 128);              Array.Copy(keyData, 159, pemPublicExponent, 0, 3);              RSAParameters para = new RSAParameters();              para.Modulus = pemModulus;              para.Exponent = pemPublicExponent;              return para;          }                /// <summary>          /// 将pem格式私钥转换为RSAParameters          /// </summary>          /// <param name="pemFileConent">pem私钥内容</param>          /// <returns>转换得到的RSAParamenters</returns>          public static RSAParameters ConvertFromPemNormalPrivateKey(string pemFileConent)          {              if (string.IsNullOrEmpty(pemFileConent))              {                  throw new ArgumentNullException("pemFileConent", "This arg cann't be empty.");              }              //pemFileConent = pemFileConent.Replace("-----BEGIN RSA PRIVATE KEY-----", "").Replace("-----END RSA PRIVATE KEY-----", "").Replace("\n", "").Replace("\r", "");              pemFileConent = pemFileConent.Replace("-----BEGIN PRIVATE KEY-----", "").Replace("-----END PRIVATE KEY-----", "").Replace("\n", "").Replace("\r", "");              byte[] keyData = Convert.FromBase64String(pemFileConent);              if (keyData.Length < 609)              {                  throw new ArgumentException("pem file content is incorrect.");              }                    int index = 11;              byte[] pemModulus = new byte[128];              Array.Copy(keyData, index, pemModulus, 0, 128);                    index += 128;              index += 2;//141              byte[] pemPublicExponent = new byte[3];              Array.Copy(keyData, index, pemPublicExponent, 0, 3);                    index += 3;              index += 4;//148              byte[] pemPrivateExponent = new byte[128];              Array.Copy(keyData, index, pemPrivateExponent, 0, 128);                    index += 128;              index += ((int)keyData[index + 1] == 64 ? 2 : 3);//279              byte[] pemPrime1 = new byte[64];              Array.Copy(keyData, index, pemPrime1, 0, 64);                    index += 64;              index += ((int)keyData[index + 1] == 64 ? 2 : 3);//346              byte[] pemPrime2 = new byte[64];              Array.Copy(keyData, index, pemPrime2, 0, 64);                    index += 64;              index += ((int)keyData[index + 1] == 64 ? 2 : 3);//412/413              byte[] pemExponent1 = new byte[64];              Array.Copy(keyData, index, pemExponent1, 0, 64);                    index += 64;              index += ((int)keyData[index + 1] == 64 ? 2 : 3);//479/480              byte[] pemExponent2 = new byte[64];              Array.Copy(keyData, index, pemExponent2, 0, 64);                    index += 64;              index += ((int)keyData[index + 1] == 64 ? 2 : 3);//545/546              byte[] pemCoefficient = new byte[64];              Array.Copy(keyData, index, pemCoefficient, 0, 64);                    RSAParameters para = new RSAParameters();              para.Modulus = pemModulus;              para.Exponent = pemPublicExponent;              para.D = pemPrivateExponent;              para.P = pemPrime1;              para.Q = pemPrime2;              para.DP = pemExponent1;              para.DQ = pemExponent2;              para.InverseQ = pemCoefficient;              return para;          }      }
转自：ttp://www.2cto.com/kf/201202/121307.html
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