JAVA/PHP/C#版RSA验签--转

本文是上一篇文章的兄弟篇，上篇文章介绍了客户端的sdk中如何基于JAVA/PHP/C#使用RSA私钥签名，然后服务端基于JAVA使用RSA公钥验签，客户端签名/服务端验签的模式只能帮助服务端检查客户端来的请求数据是否被篡改，同样的，客户端也需要对服务端的返回结果检查是否被篡改，因此就引出了本片文章。

Java版的验签和加签均已在上一篇文章中分析过，客户端和服务端的逻辑是一样的，此处不再赘述。下面重点分析如何基于RSA的PEM文件，使用php和c#进行验签。

1、php验签

function verify($data, $sign, $rsaPublicKeyFilePath)  {

//读取公钥文件

$pubKey = file_get_contents($rsaPublicKeyFilePath);

//转换为openssl格式密钥

$res = openssl_get_publickey($pubKey);

//调用openssl内置方法验签，返回bool值

$result = (bool)openssl_verify($data, base64_decode($sign), $res);

//释放资源

openssl_free_key($res);

//返回资源是否成功

return $result;
}

注意：$ rsaPublicKeyFilePath为pem公钥文件路径

2、 c#验签

public static bool VerifySignedHash(string str_DataToVerify, string str_SignedData, string str_publicKeyFilePath)
{
byte[] SignedData = Convert.FromBase64String(str_SignedData);

ASCIIEncoding ByteConverter = new ASCIIEncoding();
byte[] DataToVerify = ByteConverter.GetBytes(str_DataToVerify);
try
{
string sPublicKeyPEM = File.ReadAllText(str_publicKeyFilePath);
RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();

rsa.PersistKeyInCsp = false;
rsa.LoadPublicKeyPEM(sPublicKeyPEM);

return rsa.VerifyData(DataToVerify, new SHA1CryptoServiceProvider(), SignedData);

}
catch (CryptographicException e)
{
Console.WriteLine(e.Message);

return false;
}
}

注：str_publicKeyFilePath为RSA公钥文件路径

此处用到了c#的Extension methods，需要对RSACryptoServiceProvider进行扩展，扩展类为RSACryptoServiceProviderExtension

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.ComponentModel;
using System.Runtime.InteropServices;
using System.Security.Cryptography;

namespace sdk
{
/// <summary>Extension method for initializing a RSACryptoServiceProvider from PEM data string.</summary>
public static class RSACryptoServiceProviderExtension
{
#region Methods

/// <summary>Extension method which initializes an RSACryptoServiceProvider from a DER public key blob.</summary>
public static void LoadPublicKeyDER(this RSACryptoServiceProvider provider, byte[] DERData)
{
byte[] RSAData = RSACryptoServiceProviderExtension.GetRSAFromDER(DERData);
byte[] publicKeyBlob = RSACryptoServiceProviderExtension.GetPublicKeyBlobFromRSA(RSAData);
provider.ImportCspBlob(publicKeyBlob);
}

/// <summary>Extension method which initializes an RSACryptoServiceProvider from a DER private key blob.</summary>
public static void LoadPrivateKeyDER(this RSACryptoServiceProvider provider, byte[] DERData)
{
byte[] privateKeyBlob = RSACryptoServiceProviderExtension.GetPrivateKeyDER(DERData);
provider.ImportCspBlob(privateKeyBlob);
}

/// <summary>Extension method which initializes an RSACryptoServiceProvider from a PEM public key string.</summary>
public static void LoadPublicKeyPEM(this RSACryptoServiceProvider provider, string sPEM)
{
byte[] DERData = RSACryptoServiceProviderExtension.GetDERFromPEM(sPEM);
RSACryptoServiceProviderExtension.LoadPublicKeyDER(provider, DERData);
}

/// <summary>Extension method which initializes an RSACryptoServiceProvider from a PEM private key string.</summary>
public static void LoadPrivateKeyPEM(this RSACryptoServiceProvider provider, string sPEM)
{
byte[] DERData = RSACryptoServiceProviderExtension.GetDERFromPEM(sPEM);
RSACryptoServiceProviderExtension.LoadPrivateKeyDER(provider, DERData);
}

/// <summary>Returns a public key blob from an RSA public key.</summary>
internal static byte[] GetPublicKeyBlobFromRSA(byte[] RSAData)
{
byte[] data = null;
UInt32 dwCertPublicKeyBlobSize = 0;
if (RSACryptoServiceProviderExtension.CryptDecodeObject(CRYPT_ENCODING_FLAGS.X509_ASN_ENCODING | CRYPT_ENCODING_FLAGS.PKCS_7_ASN_ENCODING,
new IntPtr((int)CRYPT_OUTPUT_TYPES.RSA_CSP_PUBLICKEYBLOB), RSAData, (UInt32)RSAData.Length, CRYPT_DECODE_FLAGS.NONE,
data, ref dwCertPublicKeyBlobSize))
{
data = new byte[dwCertPublicKeyBlobSize];
if (!RSACryptoServiceProviderExtension.CryptDecodeObject(CRYPT_ENCODING_FLAGS.X509_ASN_ENCODING | CRYPT_ENCODING_FLAGS.PKCS_7_ASN_ENCODING,
new IntPtr((int)CRYPT_OUTPUT_TYPES.RSA_CSP_PUBLICKEYBLOB), RSAData, (UInt32)RSAData.Length, CRYPT_DECODE_FLAGS.NONE,
data, ref dwCertPublicKeyBlobSize))
throw new Win32Exception(Marshal.GetLastWin32Error());
}
else
throw new Win32Exception(Marshal.GetLastWin32Error());
return data;
}

/// <summary>Converts DER binary format to a CAPI CRYPT_PRIVATE_KEY_INFO structure.</summary>
internal static byte[] GetPrivateKeyDER(byte[] DERData)
{
byte[] data = null;
UInt32 dwRSAPrivateKeyBlobSize = 0;
IntPtr pRSAPrivateKeyBlob = IntPtr.Zero;
if (RSACryptoServiceProviderExtension.CryptDecodeObject(CRYPT_ENCODING_FLAGS.X509_ASN_ENCODING | CRYPT_ENCODING_FLAGS.PKCS_7_ASN_ENCODING, new IntPtr((int)CRYPT_OUTPUT_TYPES.PKCS_RSA_PRIVATE_KEY),
DERData, (UInt32)DERData.Length, CRYPT_DECODE_FLAGS.NONE, data, ref dwRSAPrivateKeyBlobSize))
{
data = new byte[dwRSAPrivateKeyBlobSize];
if (!RSACryptoServiceProviderExtension.CryptDecodeObject(CRYPT_ENCODING_FLAGS.X509_ASN_ENCODING | CRYPT_ENCODING_FLAGS.PKCS_7_ASN_ENCODING, new IntPtr((int)CRYPT_OUTPUT_TYPES.PKCS_RSA_PRIVATE_KEY),
DERData, (UInt32)DERData.Length, CRYPT_DECODE_FLAGS.NONE, data, ref dwRSAPrivateKeyBlobSize))
throw new Win32Exception(Marshal.GetLastWin32Error());
}
else
throw new Win32Exception(Marshal.GetLastWin32Error());
return data;
}

/// <summary>Converts DER binary format to a CAPI CERT_PUBLIC_KEY_INFO structure containing an RSA key.</summary>
internal static byte[] GetRSAFromDER(byte[] DERData)
{
byte[] data = null;
byte[] publicKey = null;
CERT_PUBLIC_KEY_INFO info;
UInt32 dwCertPublicKeyInfoSize = 0;
IntPtr pCertPublicKeyInfo = IntPtr.Zero;
if (RSACryptoServiceProviderExtension.CryptDecodeObject(CRYPT_ENCODING_FLAGS.X509_ASN_ENCODING | CRYPT_ENCODING_FLAGS.PKCS_7_ASN_ENCODING, new IntPtr((int)CRYPT_OUTPUT_TYPES.X509_PUBLIC_KEY_INFO),
DERData, (UInt32)DERData.Length, CRYPT_DECODE_FLAGS.NONE, data, ref dwCertPublicKeyInfoSize))
{
data = new byte[dwCertPublicKeyInfoSize];
if (RSACryptoServiceProviderExtension.CryptDecodeObject(CRYPT_ENCODING_FLAGS.X509_ASN_ENCODING | CRYPT_ENCODING_FLAGS.PKCS_7_ASN_ENCODING, new IntPtr((int)CRYPT_OUTPUT_TYPES.X509_PUBLIC_KEY_INFO),
DERData, (UInt32)DERData.Length, CRYPT_DECODE_FLAGS.NONE, data, ref dwCertPublicKeyInfoSize))
{
GCHandle handle = GCHandle.Alloc(data, GCHandleType.Pinned);
try
{
info = (CERT_PUBLIC_KEY_INFO)Marshal.PtrToStructure(handle.AddrOfPinnedObject(), typeof(CERT_PUBLIC_KEY_INFO));
publicKey = new byte[info.PublicKey.cbData];
Marshal.Copy(info.PublicKey.pbData, publicKey, 0, publicKey.Length);
}
finally
{
handle.Free();
}
}
else
throw new Win32Exception(Marshal.GetLastWin32Error());
}
else
throw new Win32Exception(Marshal.GetLastWin32Error());
return publicKey;
}

/// <summary>Extracts the binary data from a PEM file.</summary>
internal static byte[] GetDERFromPEM(string sPEM)
{
UInt32 dwSkip, dwFlags;
UInt32 dwBinarySize = 0;

if (!RSACryptoServiceProviderExtension.CryptStringToBinary(sPEM, (UInt32)sPEM.Length, CRYPT_STRING_FLAGS.CRYPT_STRING_BASE64HEADER, null, ref dwBinarySize, out dwSkip, out dwFlags))
throw new Win32Exception(Marshal.GetLastWin32Error());

byte[] decodedData = new byte[dwBinarySize];
if (!RSACryptoServiceProviderExtension.CryptStringToBinary(sPEM, (UInt32)sPEM.Length, CRYPT_STRING_FLAGS.CRYPT_STRING_BASE64HEADER, decodedData, ref dwBinarySize, out dwSkip, out dwFlags))
throw new Win32Exception(Marshal.GetLastWin32Error());
return decodedData;
}

#endregion Methods

#region P/Invoke Constants

/// <summary>Enumeration derived from Crypto API.</summary>
internal enum CRYPT_ACQUIRE_CONTEXT_FLAGS : uint
{
CRYPT_NEWKEYSET = 0x8,
CRYPT_DELETEKEYSET = 0x10,
CRYPT_MACHINE_KEYSET = 0x20,
CRYPT_SILENT = 0x40,
CRYPT_DEFAULT_CONTAINER_OPTIONAL = 0x80,
CRYPT_VERIFYCONTEXT = 0xF0000000
}

/// <summary>Enumeration derived from Crypto API.</summary>
internal enum CRYPT_PROVIDER_TYPE : uint
{
PROV_RSA_FULL = 1
}

/// <summary>Enumeration derived from Crypto API.</summary>
internal enum CRYPT_DECODE_FLAGS : uint
{
NONE = 0,
CRYPT_DECODE_ALLOC_FLAG = 0x8000
}

/// <summary>Enumeration derived from Crypto API.</summary>
internal enum CRYPT_ENCODING_FLAGS : uint
{
PKCS_7_ASN_ENCODING = 0x00010000,
X509_ASN_ENCODING = 0x00000001,
}

/// <summary>Enumeration derived from Crypto API.</summary>
internal enum CRYPT_OUTPUT_TYPES : int
{
X509_PUBLIC_KEY_INFO = 8,
RSA_CSP_PUBLICKEYBLOB = 19,
PKCS_RSA_PRIVATE_KEY = 43,
PKCS_PRIVATE_KEY_INFO = 44
}

/// <summary>Enumeration derived from Crypto API.</summary>
internal enum CRYPT_STRING_FLAGS : uint
{
CRYPT_STRING_BASE64HEADER = 0,
CRYPT_STRING_BASE64 = 1,
CRYPT_STRING_BINARY = 2,
CRYPT_STRING_BASE64REQUESTHEADER = 3,
CRYPT_STRING_HEX = 4,
CRYPT_STRING_HEXASCII = 5,
CRYPT_STRING_BASE64_ANY = 6,
CRYPT_STRING_ANY = 7,
CRYPT_STRING_HEX_ANY = 8,
CRYPT_STRING_BASE64X509CRLHEADER = 9,
CRYPT_STRING_HEXADDR = 10,
CRYPT_STRING_HEXASCIIADDR = 11,
CRYPT_STRING_HEXRAW = 12,
CRYPT_STRING_NOCRLF = 0x40000000,
CRYPT_STRING_NOCR = 0x80000000
}

#endregion P/Invoke Constants

#region P/Invoke Structures

/// <summary>Structure from Crypto API.</summary>
[StructLayout(LayoutKind.Sequential)]
internal struct CRYPT_OBJID_BLOB
{
internal UInt32 cbData;
internal IntPtr pbData;
}

/// <summary>Structure from Crypto API.</summary>
[StructLayout(LayoutKind.Sequential)]
internal struct CRYPT_ALGORITHM_IDENTIFIER
{
internal IntPtr pszObjId;
internal CRYPT_OBJID_BLOB Parameters;
}

/// <summary>Structure from Crypto API.</summary>
[StructLayout(LayoutKind.Sequential)]
struct CRYPT_BIT_BLOB
{
internal UInt32 cbData;
internal IntPtr pbData;
internal UInt32 cUnusedBits;
}

/// <summary>Structure from Crypto API.</summary>
[StructLayout(LayoutKind.Sequential)]
struct CERT_PUBLIC_KEY_INFO
{
internal CRYPT_ALGORITHM_IDENTIFIER Algorithm;
internal CRYPT_BIT_BLOB PublicKey;
}

#endregion P/Invoke Structures

#region P/Invoke Functions

/// <summary>Function for Crypto API.</summary>
[DllImport("advapi32.dll", SetLastError = true)]
[return: MarshalAs(UnmanagedType.Bool)]
internal static extern bool CryptDestroyKey(IntPtr hKey);

/// <summary>Function for Crypto API.</summary>
[DllImport("advapi32.dll", SetLastError = true)]
[return: MarshalAs(UnmanagedType.Bool)]
internal static extern bool CryptImportKey(IntPtr hProv, byte[] pbKeyData, UInt32 dwDataLen, IntPtr hPubKey, UInt32 dwFlags, ref IntPtr hKey);

/// <summary>Function for Crypto API.</summary>
[DllImport("advapi32.dll", SetLastError = true)]
[return: MarshalAs(UnmanagedType.Bool)]
internal static extern bool CryptReleaseContext(IntPtr hProv, Int32 dwFlags);

/// <summary>Function for Crypto API.</summary>
[DllImport("advapi32.dll", CharSet = CharSet.Auto, SetLastError = true)]
[return: MarshalAs(UnmanagedType.Bool)]
internal static extern bool CryptAcquireContext(ref IntPtr hProv, string pszContainer, string pszProvider, CRYPT_PROVIDER_TYPE dwProvType, CRYPT_ACQUIRE_CONTEXT_FLAGS dwFlags);

/// <summary>Function from Crypto API.</summary>
[DllImport("crypt32.dll", SetLastError = true, CharSet = CharSet.Auto)]
[return: MarshalAs(UnmanagedType.Bool)]
internal static extern bool CryptStringToBinary(string sPEM, UInt32 sPEMLength, CRYPT_STRING_FLAGS dwFlags, [Out] byte[] pbBinary, ref UInt32 pcbBinary, out UInt32 pdwSkip, out UInt32 pdwFlags);

/// <summary>Function from Crypto API.</summary>
[DllImport("crypt32.dll", SetLastError = true)]
[return: MarshalAs(UnmanagedType.Bool)]
internal static extern bool CryptDecodeObjectEx(CRYPT_ENCODING_FLAGS dwCertEncodingType, IntPtr lpszStructType, byte[] pbEncoded, UInt32 cbEncoded, CRYPT_DECODE_FLAGS dwFlags, IntPtr pDecodePara, ref byte[] pvStructInfo, ref UInt32 pcbStructInfo);

/// <summary>Function from Crypto API.</summary>
[DllImport("crypt32.dll", SetLastError = true)]
[return: MarshalAs(UnmanagedType.Bool)]
internal static extern bool CryptDecodeObject(CRYPT_ENCODING_FLAGS dwCertEncodingType, IntPtr lpszStructType, byte[] pbEncoded, UInt32 cbEncoded, CRYPT_DECODE_FLAGS flags, [In, Out] byte[] pvStructInfo, ref UInt32 cbStructInfo);

#endregion P/Invoke Functions
}
}

原文地址：http://xw-z1985.iteye.com/blog/1929931