<p>출처 :&nbsp;<a href="http://www.bouncycastle.org/csharp/" target="_blank">http://www.bouncycastle.org/csharp/</a></p><p>&nbsp;</p><p>키를 생성하는 부분은 구현하지 않았다.</p><div style="background-color:rgb(30, 30, 30);color:rgb(212, 212, 212);font-family:Consolas, &quot;Courier New&quot;, monospace;font-size:14px;line-height:19px;white-space:pre;">Install-Package&nbsp;BouncyCastle&nbsp;-Version&nbsp;1.8.6.1</div><p>&nbsp;</p><p>또는</p><p>&nbsp;</p><p><a class="file-link" href="/api/file/0JX8TQWEF88HM" target="_blank"><span>BouncyCastle.Crypto.dll</span></a></p><p>&nbsp;</p><p>&nbsp;</p><div style="background-color:rgb(30, 30, 30);color:rgb(212, 212, 212);font-family:Consolas, &quot;Courier New&quot;, monospace;font-size:14px;line-height:19px;white-space:pre;"><div><span style="color:#c586c0;">using</span>&nbsp;<span style="color:#4ec9b0;">Org</span>.<span style="color:#4ec9b0;">BouncyCastle</span>.<span style="color:#4ec9b0;">Crypto</span>;</div><div><span style="color:#c586c0;">using</span>&nbsp;<span style="color:#4ec9b0;">Org</span>.<span style="color:#4ec9b0;">BouncyCastle</span>.<span style="color:#4ec9b0;">Crypto</span>.<span style="color:#4ec9b0;">Parameters</span>;</div><div><span style="color:#c586c0;">using</span>&nbsp;<span style="color:#4ec9b0;">Org</span>.<span style="color:#4ec9b0;">BouncyCastle</span>.<span style="color:#4ec9b0;">Security</span>;</div><p><br>&nbsp;</p><div><span style="color:#569cd6;">static</span>&nbsp;<span style="color:#569cd6;">class</span>&nbsp;<span style="color:#4ec9b0;">RsaHelper</span></div><div>{</div><p><br>&nbsp;</p><div>&nbsp;&nbsp;&nbsp; <span style="color:#569cd6;">private</span>&nbsp;<span style="color:#569cd6;">static</span>&nbsp;<span style="color:#4ec9b0;">RSACryptoServiceProvider</span>&nbsp;<span style="color:#dcdcaa;">RSACryptoServiceProviderWithPublicKey</span>(<span style="color:#569cd6;">string</span>&nbsp;<span style="color:#9cdcfe;">publicKeyBase64</span>)</div><div>&nbsp;&nbsp;&nbsp;&nbsp;{</div><div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <span style="color:#569cd6;">byte</span>[]&nbsp;<span style="color:#9cdcfe;">publicKeyBytes</span>&nbsp;=&nbsp;<span style="color:#9cdcfe;">Convert</span>.<span style="color:#dcdcaa;">FromBase64String</span>(<span style="color:#9cdcfe;">publicKeyBase64</span>);</div><div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <span style="color:#4ec9b0;">AsymmetricKeyParameter</span>&nbsp;<span style="color:#9cdcfe;">asymmetricKeyParameter</span>&nbsp;=&nbsp;<span style="color:#9cdcfe;">PublicKeyFactory</span>.<span style="color:#dcdcaa;">CreateKey</span>(<span style="color:#9cdcfe;">publicKeyBytes</span>);</div><div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <span style="color:#4ec9b0;">RsaKeyParameters</span>&nbsp;<span style="color:#9cdcfe;">rsaKeyParameters</span>&nbsp;=&nbsp;(<span style="color:#4ec9b0;">RsaKeyParameters</span>)<span style="color:#9cdcfe;">asymmetricKeyParameter</span>;</div><div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <span style="color:#4ec9b0;">RSAParameters</span>&nbsp;<span style="color:#9cdcfe;">rsaParameters</span>&nbsp;=&nbsp;<span style="color:#569cd6;">new</span>&nbsp;<span style="color:#4ec9b0;">RSAParameters</span>();</div><div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <span style="color:#9cdcfe;">rsaParameters</span>.<span style="color:#9cdcfe;">Modulus</span>&nbsp;=&nbsp;<span style="color:#9cdcfe;">rsaKeyParameters</span>.<span style="color:#9cdcfe;">Modulus</span>.<span style="color:#dcdcaa;">ToByteArrayUnsigned</span>();</div><div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <span style="color:#9cdcfe;">rsaParameters</span>.<span style="color:#9cdcfe;">Exponent</span>&nbsp;=&nbsp;<span style="color:#9cdcfe;">rsaKeyParameters</span>.<span style="color:#9cdcfe;">Exponent</span>.<span style="color:#dcdcaa;">ToByteArrayUnsigned</span>();</div><div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <span style="color:#4ec9b0;">RSACryptoServiceProvider</span>&nbsp;<span style="color:#9cdcfe;">rsa</span>&nbsp;=&nbsp;<span style="color:#569cd6;">new</span>&nbsp;<span style="color:#4ec9b0;">RSACryptoServiceProvider</span>();</div><div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <span style="color:#9cdcfe;">rsa</span>.<span style="color:#dcdcaa;">ImportParameters</span>(<span style="color:#9cdcfe;">rsaParameters</span>);</div><div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <span style="color:#c586c0;">return</span>&nbsp;<span style="color:#9cdcfe;">rsa</span>;</div><div>&nbsp;&nbsp;&nbsp;&nbsp;}</div><p><br>&nbsp;</p><div>&nbsp;&nbsp;&nbsp; <span style="color:#569cd6;">private</span>&nbsp;<span style="color:#569cd6;">static</span>&nbsp;<span style="color:#4ec9b0;">RSACryptoServiceProvider</span>&nbsp;<span style="color:#dcdcaa;">RSACryptoServiceProviderWithPrivateKey</span>(<span style="color:#569cd6;">string</span>&nbsp;<span style="color:#9cdcfe;">privateKeyBase64</span>)</div><div>&nbsp;&nbsp;&nbsp;&nbsp;{</div><div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <span style="color:#569cd6;">byte</span>[]&nbsp;<span style="color:#9cdcfe;">privateKeyBytes</span>&nbsp;=&nbsp;<span style="color:#9cdcfe;">Convert</span>.<span style="color:#dcdcaa;">FromBase64String</span>(<span style="color:#9cdcfe;">privateKeyBase64</span>);</div><div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <span style="color:#4ec9b0;">AsymmetricKeyParameter</span>&nbsp;<span style="color:#9cdcfe;">asymmetricKeyParameter</span>&nbsp;=&nbsp;<span style="color:#9cdcfe;">PrivateKeyFactory</span>.<span style="color:#dcdcaa;">CreateKey</span>(<span style="color:#9cdcfe;">privateKeyBytes</span>);</div><div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <span style="color:#4ec9b0;">RsaKeyParameters</span>&nbsp;<span style="color:#9cdcfe;">rsaKeyParameters</span>&nbsp;=&nbsp;(<span style="color:#4ec9b0;">RsaKeyParameters</span>)<span style="color:#9cdcfe;">asymmetricKeyParameter</span>;</div><div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <span style="color:#4ec9b0;">RSAParameters</span>&nbsp;<span style="color:#9cdcfe;">rsaParameters</span>&nbsp;=&nbsp;<span style="color:#569cd6;">new</span>&nbsp;<span style="color:#4ec9b0;">RSAParameters</span>();</div><div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <span style="color:#9cdcfe;">rsaParameters</span>.<span style="color:#9cdcfe;">Modulus</span>&nbsp;=&nbsp;<span style="color:#9cdcfe;">rsaKeyParameters</span>.<span style="color:#9cdcfe;">Modulus</span>.<span style="color:#dcdcaa;">ToByteArrayUnsigned</span>();</div><div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <span style="color:#9cdcfe;">rsaParameters</span>.<span style="color:#9cdcfe;">Exponent</span>&nbsp;=&nbsp;<span style="color:#9cdcfe;">rsaKeyParameters</span>.<span style="color:#9cdcfe;">Exponent</span>.<span style="color:#dcdcaa;">ToByteArrayUnsigned</span>();</div><div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <span style="color:#4ec9b0;">RSACryptoServiceProvider</span>&nbsp;<span style="color:#9cdcfe;">rsa</span>&nbsp;=&nbsp;<span style="color:#569cd6;">new</span>&nbsp;<span style="color:#4ec9b0;">RSACryptoServiceProvider</span>();</div><div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <span style="color:#9cdcfe;">rsa</span>.<span style="color:#dcdcaa;">ImportParameters</span>(<span style="color:#9cdcfe;">rsaParameters</span>);</div><div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <span style="color:#c586c0;">return</span>&nbsp;<span style="color:#9cdcfe;">rsa</span>;</div><div>&nbsp;&nbsp;&nbsp;&nbsp;}</div><p><br><br>&nbsp;</p><div>&nbsp;&nbsp;&nbsp; <span style="color:#6a9955;">//&nbsp;RSA&nbsp;암호화</span></div><div>&nbsp;&nbsp;&nbsp; <span style="color:#569cd6;">public</span>&nbsp;<span style="color:#569cd6;">static</span>&nbsp;<span style="color:#569cd6;">string</span>&nbsp;<span style="color:#dcdcaa;">RSAEncrypt</span>(<span style="color:#569cd6;">string</span>&nbsp;<span style="color:#9cdcfe;">getValue</span>,&nbsp;<span style="color:#569cd6;">string</span>&nbsp;<span style="color:#9cdcfe;">publicKeyBase64</span>)</div><div>&nbsp;&nbsp;&nbsp;&nbsp;{</div><div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <span style="color:#4ec9b0;">RSACryptoServiceProvider</span>&nbsp;<span style="color:#9cdcfe;">rsa</span>&nbsp;=&nbsp;<span style="color:#dcdcaa;">RSACryptoServiceProviderWithPublicKey</span>(<span style="color:#9cdcfe;">publicKeyBase64</span>);</div><p><br><br>&nbsp;</p><div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <span style="color:#6a9955;">//암호화할&nbsp;문자열을&nbsp;UFT8인코딩</span></div><div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <span style="color:#569cd6;">byte</span>[]&nbsp;<span style="color:#9cdcfe;">inbuf</span>&nbsp;=&nbsp;(<span style="color:#569cd6;">new</span>&nbsp;<span style="color:#4ec9b0;">UTF8Encoding</span>()).<span style="color:#dcdcaa;">GetBytes</span>(<span style="color:#9cdcfe;">getValue</span>);</div><p><br>&nbsp;</p><div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <span style="color:#6a9955;">//암호화</span></div><div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <span style="color:#569cd6;">byte</span>[]&nbsp;<span style="color:#9cdcfe;">encbuf</span>&nbsp;=&nbsp;<span style="color:#9cdcfe;">rsa</span>.<span style="color:#dcdcaa;">Encrypt</span>(<span style="color:#9cdcfe;">inbuf</span>,&nbsp;<span style="color:#569cd6;">false</span>);</div><p><br>&nbsp;</p><div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <span style="color:#6a9955;">//암호화된&nbsp;문자열&nbsp;Base64인코딩</span></div><div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <span style="color:#c586c0;">return</span>&nbsp;<span style="color:#9cdcfe;">System</span>.<span style="color:#9cdcfe;">Convert</span>.<span style="color:#dcdcaa;">ToBase64String</span>(<span style="color:#9cdcfe;">encbuf</span>);</div><div>&nbsp;&nbsp;&nbsp;&nbsp;}</div><p><br>&nbsp;</p><div>&nbsp;&nbsp;&nbsp; <span style="color:#6a9955;">//&nbsp;RSA&nbsp;복호화</span></div><div>&nbsp;&nbsp;&nbsp; <span style="color:#569cd6;">public</span>&nbsp;<span style="color:#569cd6;">static</span>&nbsp;<span style="color:#569cd6;">string</span>&nbsp;<span style="color:#dcdcaa;">RSADecrypt</span>(<span style="color:#569cd6;">string</span>&nbsp;<span style="color:#9cdcfe;">getValue</span>,&nbsp;<span style="color:#569cd6;">string</span>&nbsp;<span style="color:#9cdcfe;">privateKeyBase64</span>)</div><div>&nbsp;&nbsp;&nbsp;&nbsp;{</div><div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <span style="color:#4ec9b0;">RSACryptoServiceProvider</span>&nbsp;<span style="color:#9cdcfe;">rsa</span>&nbsp;=&nbsp;<span style="color:#dcdcaa;">RSACryptoServiceProviderWithPrivateKey</span>(<span style="color:#9cdcfe;">privateKeyBase64</span>);</div><p><br>&nbsp;</p><div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <span style="color:#6a9955;">//sValue문자열을&nbsp;바이트배열로&nbsp;변환</span></div><div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <span style="color:#569cd6;">byte</span>[]&nbsp;<span style="color:#9cdcfe;">srcbuf</span>&nbsp;=&nbsp;<span style="color:#9cdcfe;">System</span>.<span style="color:#9cdcfe;">Convert</span>.<span style="color:#dcdcaa;">FromBase64String</span>(<span style="color:#9cdcfe;">getValue</span>);</div><p><br>&nbsp;</p><div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <span style="color:#6a9955;">//바이트배열&nbsp;복호화</span></div><div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <span style="color:#569cd6;">byte</span>[]&nbsp;<span style="color:#9cdcfe;">decbuf</span>&nbsp;=&nbsp;<span style="color:#9cdcfe;">rsa</span>.<span style="color:#dcdcaa;">Decrypt</span>(<span style="color:#9cdcfe;">srcbuf</span>,&nbsp;<span style="color:#569cd6;">false</span>);</div><p><br>&nbsp;</p><div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <span style="color:#6a9955;">//복호화&nbsp;바이트배열을&nbsp;문자열로&nbsp;변환</span></div><div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <span style="color:#569cd6;">string</span>&nbsp;<span style="color:#9cdcfe;">sDec</span>&nbsp;=&nbsp;(<span style="color:#569cd6;">new</span>&nbsp;<span style="color:#4ec9b0;">UTF8Encoding</span>()).<span style="color:#dcdcaa;">GetString</span>(<span style="color:#9cdcfe;">decbuf</span>,&nbsp;<span style="color:#b5cea8;">0</span>,&nbsp;<span style="color:#9cdcfe;">decbuf</span>.<span style="color:#9cdcfe;">Length</span>);</div><div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <span style="color:#c586c0;">return</span>&nbsp;<span style="color:#9cdcfe;">sDec</span>;</div><div>&nbsp;&nbsp;&nbsp;&nbsp;}</div><p><br>&nbsp;</p><div>}</div></div><p>&nbsp;</p><p>&nbsp;</p><p>&nbsp;</p><p>&nbsp;</p><p>&nbsp;</p><p>&nbsp;</p><p>&nbsp;</p><p>&nbsp;</p><p>&nbsp;</p><p>&nbsp;</p><p>&nbsp;</p><p>&nbsp;</p><p>&nbsp;</p>

RSA 암호화/복호화 사용하기