using System; using System.Text; using System.Security.Cryptography; using System.Web; using System.IO; namespace Thinhunan.Cnblogs.Com.RSAUtility { public class PemConverter { /// <summary> /// 將pem格式公鑰轉換為RSAParameters /// </summary> /// <param name="pemFileConent">pem公鑰內容</param> /// <returns>轉換得到的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); 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> /// 將pem格式私鑰轉換為RSAParameters /// </summary> /// <param name="pemFileConent">pem私鑰內容</param> /// <returns>轉換得到的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",""); 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; } } } 測試pem導成RSAParameters成功,使用通過: using System; using System.Security.Cryptography; using System.Text; using System.IO; using System.Web; namespace Thinhunan.Cnblogs.Com.RSAUtility { class Program { #region keys const string PUBLICKEY = @"-----BEGIN PUBLIC KEY----- MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDpsDr+W45aFHIkvotZaGK/THlF FpuZfUtghhWkHAm3H7yvL42J4xHrTr6IeUDCl4eKe6qiIgvYSNoL3u4SERGOeYmV 1F+cocu9IMGnNoicbh1zVW6e8/iGT3xaYQizJoVuWA/TC/zdds2ihCJfHDBDsouO CXecPapyWCGQNsH5sQIDAQAB -----END PUBLIC KEY-----"; const string PRIVATEKEY = @"-----BEGIN RSA PRIVATE KEY----- MIICXQIBAAKBgQDpsDr+W45aFHIkvotZaGK/THlFFpuZfUtghhWkHAm3H7yvL42J 4xHrTr6IeUDCl4eKe6qiIgvYSNoL3u4SERGOeYmV1F+cocu9IMGnNoicbh1zVW6e 8/iGT3xaYQizJoVuWA/TC/zdds2ihCJfHDBDsouOCXecPapyWCGQNsH5sQIDAQAB AoGBAM/JbFs4y5WbMncrmjpQj+UrOXVOCeLrvrc/4kQ+zgCvTpWywbaGWiuRo+cz cXrVQ6bGGU362e9hr8f4XFViKemDL4SmJbgSDa1K71i+/LnnzF6sjiDBFQ/jA9SK 4PYrY7a3IkeBQnJmknanykugyQ1xmCjbuh556fOeRPaHnhx1AkEA/flrxJSy1Z+n Y1RPgDOeDqyG6MhwU1Jl0yJ1sw3Or4qGRXhjTeGsCrKqV0/ajqdkDEM7FNkqnmsB +vPd116J6wJBAOuNY3oOWvy2fQ32mj6XV+S2vcG1osEUaEuWvEgkGqJ9co6100Qp j15036AQEEDqbjdqS0ShfeRSwevTJZIap9MCQCeMGDDjKrnDA5CfB0YiQ4FrchJ7 a6o90WdAHW3FP6LsAh59MZFmC6Ea0xWHdLPz8stKCMAlVNKYPRWztZ6ctQMCQQC8 iWbeAy+ApvBhhMjg4HJRdpNbwO6MbLEuD3CUrZFEDfTrlU2MeVdv20xC6ZiY3Qtq /4FPZZNGdZcSEuc3km5RAkApGkZmWetNwDJMcUJbSBrQMFfrQObqMPBPe+gEniQq Ttwu1OULHlmUg9eW31wRI2uiXcFCJMHuro6iOQ1VJ4Qs -----END RSA PRIVATE KEY-----"; #endregion static void Main(string[] args) { TestSignAndVerify(); } public static void TestSignAndVerify() { //sign RSAParameters para = PemConverter.ConvertFromPemPrivateKey(PRIVATEKEY); RSACryptoServiceProvider rsa = new RSACryptoServiceProvider(); rsa.ImportParameters(para); byte[] testData = Encoding.UTF8.GetBytes("hello"); MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider(); byte[] signData = rsa.SignData(testData, md5); //verify RSAParameters paraPub = PemConverter.ConvertFromPemPublicKey(PUBLICKEY); RSACryptoServiceProvider rsaPub = new RSACryptoServiceProvider(); rsaPub.ImportParameters(paraPub); if (rsaPub.VerifyData(testData, md5, signData)) { Console.WriteLine("ok"); } else { Console.WriteLine("no"); } } } }
原文地址:http://www.itstrike.cn/Question/-NET-generates-pem-using-OpenSSL-key-file