Generate Rsa Public Key From Modulus Exponent
Rsa Public Key Example
Is sharing the modulus for multiple RSA key pairs secure? Bob should generate a new modulus, this is not that expensive. Is it possible to correct the. Jun 15, 2015 Hi guys, I've been wracking my brain for weeks on RSA encryption and it turns out the key I had isn't the key at all, its an exponent and I need to use the exponent and modulus I have to generate a key, however it doesn't seem (from what I've found) that Apple has a way of doing that in iOS. How to generate public/private key in C#. Asymmetric cryptography also known as public-key encryption uses a public/private key pair to encrypt and decrypt data. In.NET, the RSACryptoServiceProvider and DSACryptoServiceProvider classes are used for asymmetric encryption. For this porpose I could either spin up a Linix VM or, as an easier and less heavy solution, I used Cygwin tool to run OpenSSL commands and generate private/public RSA key value pair. Challenge number 2 - PEM format not supported.
| usingSystem; |
| usingSystem.Diagnostics; |
| usingSystem.Security.Cryptography; |
| usingSystem.Text; |
| namespaceCrtypto |
| { |
| classProgram |
| { |
| staticvoidMain(string[] args) |
| { |
| // generating public/private keys |
| // |
| //Debug.WriteLine('private: ' + RSA.ToXmlString(true)); |
| //Debug.WriteLine('public: ' + RSA.ToXmlString(false)); |
| varpublicKey= |
| '<RSAKeyValue><Modulus>21wEnTU+mcD2w0Lfo1Gv4rtcSWsQJQTNa6gio05AOkV/Er9w3Y13Ddo5wGtjJ19402S71HUeN0vbKILLJdRSES5MHSdJPSVrOqdrll/vLXxDxWs/U0UT1c8u6k/Ogx9hTtZxYwoeYqdhDblof3E75d9n2F0Zvf6iTb4cI7j6fMs=</Modulus><Exponent>AQAB</Exponent></RSAKeyValue>'; |
| varprivateKey= |
| '<RSAKeyValue><Modulus>21wEnTU+mcD2w0Lfo1Gv4rtcSWsQJQTNa6gio05AOkV/Er9w3Y13Ddo5wGtjJ19402S71HUeN0vbKILLJdRSES5MHSdJPSVrOqdrll/vLXxDxWs/U0UT1c8u6k/Ogx9hTtZxYwoeYqdhDblof3E75d9n2F0Zvf6iTb4cI7j6fMs=</Modulus><Exponent>AQAB</Exponent><P>/aULPE6jd5IkwtWXmReyMUhmI/nfwfkQSyl7tsg2PKdpcxk4mpPZUdEQhHQLvE84w2DhTyYkPHCtq/mMKE3MHw</P><Q>3WV46X9Arg2l9cxb67KVlNVXyCqc/w+LWt/tbhLJvV2xCF/0rWKPsBJ9MC6cquaqNPxWWEav8RAVbmmGrJt51Q</Q><DP>8TuZFgBMpBoQcGUoS2goB4st6aVq1FcG0hVgHhUI0GMAfYFNPmbDV3cY2IBt8Oj/uYJYhyhlaj5YTqmGTYbATQ</DP><DQ>FIoVbZQgrAUYIHWVEYi/187zFd7eMct/Yi7kGBImJStMATrluDAspGkStCWe4zwDDmdam1XzfKnBUzz3AYxrAQ</DQ><InverseQ>QPU3Tmt8nznSgYZ+5jUo9E0SfjiTu435ihANiHqqjasaUNvOHKumqzuBZ8NRtkUhS6dsOEb8A2ODvy7KswUxyA</InverseQ><D>cgoRoAUpSVfHMdYXW9nA3dfX75dIamZnwPtFHq80ttagbIe4ToYYCcyUz5NElhiNQSESgS5uCgNWqWXt5PnPu4XmCXx6utco1UVH8HGLahzbAnSy6Cj3iUIQ7Gj+9gQ7PkC434HTtHazmxVgIR5l56ZjoQ8yGNCPZnsdYEmhJWk=</D></RSAKeyValue>'; |
| vartestData=Encoding.UTF8.GetBytes('testing'); |
| using ( varrsa=newRSACryptoServiceProvider(1024)) |
| { |
| try |
| { |
| // client encrypting data with public key issued by server |
| // |
| rsa.FromXmlString(publicKey); |
| varencryptedData=rsa.Encrypt(testData, true); |
| varbase64Encrypted=Convert.ToBase64String(encryptedData); |
| Debug.WriteLine(base64Encrypted); |
| // server decrypting data with private key |
| // |
| rsa.FromXmlString(privateKey); |
| varresultBytes=Convert.FromBase64String(base64Encrypted); |
| vardecryptedBytes=rsa.Decrypt(resultBytes, true); |
| vardecryptedData=Encoding.UTF8.GetString(decryptedBytes); |
| Debug.WriteLine(decryptedData); |
| } |
| finally |
| { |
| rsa.PersistKeyInCsp=false; |
| } |
| } |
| } |
| } |
| } |
Aug 06, 2015 How can I generate a public key using given modulus and exponent? Create public key from component of modulus and exponent #43. Closed xavieryao opened this issue Aug 6, 2015 8 comments Closed Create public key from component of modulus and exponent #43. Xavieryao opened this issue Aug 6. How to generate public/private key in C#. Asymmetric cryptography also known as public-key encryption uses a public/private key pair to encrypt and decrypt data. In.NET, the RSACryptoServiceProvider and DSACryptoServiceProvider classes are used for asymmetric encryption. Apr 06, 2020 I fixed this by base64-encoding the exponent and modulus in big-endian format (in python) and then loading them with RSACryptoServiceProvider.FromXmlString (in.NET). Working Example. I hardcoded the (N, E, D) parameters for a private key in python and exported the exponent and modulus to be used later for encryption.
commented May 9, 2015
Why exactly do you need ToBase64String and FromBase64String? Counter-Strike: Condition Zero free steam key is now available on SteamUnlock.org.!. Counter strike condition zero steam key generator. I've seen some people saying this is necessary: http://stackoverflow.com/a/2164186/145349 Can you confirm this? |
commented Jul 26, 2017
@fjsj it's good to use Base64 encoding to encode a byte sequence to a string instead of Unicode encoding, because not every byte sequence has a Unicode representation. In this example, when the RSA encrypts the input bytes you can't be sure if the output bytes have a Unicode representation, but you can be sure that they have a Base64 representation. |
Openssl Modulus
commented Feb 2, 2018
Thanks for code! |
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