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Extracting RSA public key modulus and exponent stored in unsigned char arrays


Extracting RSA public key modulus and exponent stored in unsigned char arrays

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Extracting RSA public key modulus and exponent stored in unsigned char arrays
Tag : java , By : Neuromaster
Date : November 24 2020, 05:47 AM


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How to create a RSA public key from a unsigned char * modulus and exponent 65537(RSA_F4)


Tag : cpp , By : smbrant
Date : March 29 2020, 07:55 AM
Does that help I'm trying generate a rsa public key from a modulus type char[], and I now the exponent is RSA_F4(65537); But when I'm trying generate my public key using this values for "n" and "e", the RSA_public_encrypt, return -1; , You probably want something that looks more like:
RSA *pubkey = RSA_new();
int len = BN_hex2bn(&pubkey->n, (const char *)p);
if (len == 0 || p[len])
    fprintf(stderr, "'%s' does not appear to be a valid modulus\n", p);
BN_hex2bn(&pubkey->e, "010001");
if (RSA_public_encrypt(....) <= 0)

Extracting modulus and exponent from public key using Openssl and C++


Tag : cpp , By : mikhaelrasputin
Date : March 29 2020, 07:55 AM
seems to work fine So I'm currently studying how networking works. I've got a bunch of packets from wireshark which I have already copied in buffers(only the content, without header. Wireshark->Follow TPC Stream->C arrays). I can understand the protocol but in the 3rd packet it requires a key exchange. After some googling I found that I need RSA encryption. It sends me a public key + token. And I shoud return encrypted shared key(just generated) and encrypted token which I received earlier. , The data you posted is an ASN.1 encoded (DER) RSA public key:
$ openssl ssl rsa -inform der -pubin -text < 12120862.key 
Public-Key: (1024 bit)
Modulus:
    00:81:1f:1d:00:7e:d0:c7:e2:2f:31:3d:0d:f0:a8:
    ab:c1:ea:66:ba:af:1d:a4:eb:b3:fd:51:58:1c:1d:
    81:ae:f0:99:9e:5c:26:67:b5:41:14:28:79:c0:29:
    e5:56:96:06:b7:4b:a0:c9:7f:41:46:9a:7e:85:10:
    a0:91:ea:58:bd:78:78:6d:3c:07:2a:3d:61:f3:ed:
    42:8b:1e:dc:6d:2d:21:41:7a:e8:15:51:0d:75:84:
    be:20:8c:76:43:8b:4b:67:6b:49:09:e9:20:a1:11:
    53:a0:d9:30:b1:c2:27:a6:09:e1:56:36:ed:7e:9b:
    23:e2:df:5b:bd:c5:66:ca:c5
Exponent: 65537 (0x10001)
writing RSA key
-----BEGIN PUBLIC KEY-----
MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCBHx0AftDH4i8xPQ3wqKvB6ma6
rx2k67P9UVgcHYGu8JmeXCZntUEUKHnAKeVWlga3S6DJf0FGmn6FEKCR6li9eHht
PAcqPWHz7UKLHtxtLSFBeugVUQ11hL4gjHZDi0tna0kJ6SChEVOg2TCxwiemCeFW
Nu1+myPi31u9xWbKxQIDAQAB
-----END PUBLIC KEY-----

Generating an RSA KeyPair and extracting modulus and exponent from Public Key in Android


Tag : android , By : davidg
Date : March 29 2020, 07:55 AM
This might help you There was no native Android method to solve my problem. In order to extract the modulus and exponent of the generated Public Key, I used the following code, which takes an Android Public Key as Input and returns it in the .NET XML Format:
   public static String getPublicKeyAsXml(PublicKey publicKey) throws Exception

     {

        KeyFactory kf = KeyFactory.getInstance("RSA");
        RSAPublicKeySpec ks = kf.getKeySpec(publicKey, RSAPublicKeySpec.class);
        BigInteger modulus = ks.getModulus();
        BigInteger exponent = ks.getPublicExponent();
        byte[] modByte = modulus.toByteArray();
        byte[] expByte = exponent.toByteArray();
        modByte = testBytes(modByte);
        expByte = testBytes(expByte);
        String encodedModulus = Base64.encodeToString(modByte, Base64.NO_WRAP);
        String encodedExponent = Base64.encodeToString(expByte, Base64.NO_WRAP);
        String publicKeyAsXML = "<RSAKeyValue>" +
                "<Modulus>" + encodedModulus + "</Modulus>" +
                "<Exponent>" + encodedExponent + "</Exponent>" +
                "</RSAKeyValue>";

        return publicKeyAsXML;
    }

Extract modulus n, private exponent and public exponent in Python cryptography library


Tag : python , By : Maplye
Date : March 29 2020, 07:55 AM
I wish this help you I am using Python cryptography library and I need to encrypt something with RSA. It all works great, except one thing. , You can access using public_numbers() and private_numbers()
 public_key.public_numbers()
 private_key.private_numbers()
In [13]: [a for a in dir(public_key) if not a.startswith("_")]
Out[13]: ['encrypt', 'key_size', 'public_bytes', 'public_numbers', 'verifier']

In [14]: [a for a in dir(private_key) if not a.startswith("_")]
Out[14]: 
['decrypt',
 'key_size',
 'private_bytes',
 'private_numbers',
 'public_key',
 'signer']


In [15]: [a for a in dir(private_key.private_numbers()) if not a.startswith("_")]
Out[15]: ['d', 'dmp1', 'dmq1', 'iqmp', 'p', 'private_key', 'public_numbers', 'q']

In [16]: [a for a in dir(public_key.public_numbers()) if not a.startswith("_")]
Out[16]: ['e', 'n', 'public_key']

In [17]: [a for a in dir(private_key.private_numbers().public_numbers) if not a.startswith("_")]
Out[17]: ['e', 'n', 'public_key']

How to store modulus, public exponent and private exponent securely on Android?


Tag : android , By : Salikh
Date : March 29 2020, 07:55 AM
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