pkcs#1

问题 I am trying to initialize a Cipher object for encryption and decryption. String cipher = privateKey.getAlgorithm() + "/ECB/PKCS1Padding"; mCipher = Cipher.getInstance(cipher, "AndroidKeyStore"); I keep getting the following exception on android: System.err: java.security.NoSuchAlgorithmException: Provider AndroidKeyStore does not provide RSA/ECB/PKCS1Padding 03-20 00:28:38.270 19817 21488 W System.err: at javax.crypto.Cipher.getCipher(Cipher.java:357) 03-20 00:28:38.270 19817 21488 W System

问题 I am trying to initialize a Cipher object for encryption and decryption. String cipher = privateKey.getAlgorithm() + "/ECB/PKCS1Padding"; mCipher = Cipher.getInstance(cipher, "AndroidKeyStore"); I keep getting the following exception on android: System.err: java.security.NoSuchAlgorithmException: Provider AndroidKeyStore does not provide RSA/ECB/PKCS1Padding 03-20 00:28:38.270 19817 21488 W System.err: at javax.crypto.Cipher.getCipher(Cipher.java:357) 03-20 00:28:38.270 19817 21488 W System

问题 The following code uses the JcaPEMWriter class from BouncyCastle to output a randomly generated RSA private key in PKCS#1 format ( -----BEGIN RSA PRIVATE KEY----- ): public static void main(String[] args) throws Exception { final KeyPairGenerator kpg = KeyPairGenerator.getInstance("RSA"); kpg.initialize(2048, null); final KeyPair kp = kpg.generateKeyPair(); final PrivateKey privateKey = kp.getPrivate(); final StringWriter s = new StringWriter(); try (JcaPEMWriter w = new JcaPEMWriter(s)) { w

问题 I'm generating CMS signature files with external PKCS#1 based on this thread. The first step is obtain the signed attributes from the original file to be signed in external application which is returning PKCS#1 byte array. Then build standard org.bouncycastle.cms.SignerInfoGenerator with original file hash, signed data (PKCS#1) and certificate to add to CMS, and finally create the attached signature . But when i'd tried to validate it using this code: String originalFile =

问题 Until today I was living under the impression that RSA encryption using RSA is deterministic. After all, how should signature verification work if it wasn't? To my big suprise, .NETs RSACryptoServiceProvider does not have a stable output when encrypting the same set of bytes with the same keys: [Fact] public void Learning() { const int keySize = 1024; System.Security.Cryptography.RSACryptoServiceProvider rsa = new System.Security.Cryptography.RSACryptoServiceProvider(keySize); var bytes =

问题 After struggling uncountable hours I finally have the current working code to generate CMS enveloped (RSA-OAEP / PKCS#1) data with recipient info using JCE/JCA: String digest = "SHA-256"; String mgfDigest = "SHA-256"; // Data to encrypt CMSTypedData msg = new CMSProcessableByteArray(data); // Generator for my CMS enveloped data CMSEnvelopedDataGenerator envelopedDataGen = new CMSEnvelopedDataGenerator(); // Recipient Info Stuff JcaAlgorithmParametersConverter paramsConverter = new

问题 I need encrypt data using exactly the PKCS#1 V2.0 encryption method (defined in item 7.2.1 of the PKCS#1V2 specification). Is it already implemented for Java? I'm thinking in something like just pass a parameter to javax.crypto.Cipher specifying "PKCS#1V2", I wonder if there is something like this? 回答1: PKCS#1 v2.0 encryption is usually called OAEP encryption. So: Cipher.getInstance("RSA/ECB/OAEPWithSHA1AndMGF1Padding"); The place to look is the Java Cryptography Architecture documents:

问题 Why is the modulus padded with leading zeros? I was reading PKCS#1 and PKCS#8 but didn't find anything about it. In c# the leading zeros must be removed, does anybody know why? At http://etherhack.co.uk/asymmetric/docs/rsa_key_breakdown.html, you can see that the modulus and exponent have leading zeros. The question is why they have it, I haven't found an explanation anywhere yet. 回答1: The private key values are encoded as ASN.1 INTEGERs, which are signed values in two's complement format.

问题 I have an Encrypted Private Key(say,servenc.key) in below format: -----BEGIN ENCRYPTED PRIVATE KEY----- MIIC2TBTBgkqhkiG9w0BBQ0wRjAlBgkqhkiG9w0BBQwwGAQSIFFvMaBFyBvqqhY6 yTV2fMVVAgIUczAdBglghkgBZQMEASoEEGRetyFtHhnJ7TZTM2qolWkEggKAFg/h GERtM1loEd+u8VAtLwTzBiXE5pmRpp/hX/1HrbBnzFjAsNtWlEtzpSuxuCoXtMst uKRB8qveHlfTQPzopkRZtljfOkD1DhdJz8BXSZrFmVkMrUq6m4Y/rnqTqI5JmtmQ qAXTBbl7u8TwMnqIaoSInEHnc+aiFT3KJuIq6PZy2rGKWGW2WB/OML2gANvHBI9n gyOo4VZHNsR6VBbCRJErUFhF5Wk2/YJD9ejnvXH6pJFqZYvnCFjkSlR+4MdCHBSo

问题 I have a Certificates.p12 file that I wish to convert to a certificates.pem containing an unencrypted private key in PKCS#1 format. I have previously been able to do this by running: openssl pkcs12 -in Certificates.p12 -out certificates.pem -nodes -clcerts The resulting certificates.pem file has a PRIVATE KEY PEM block, as expected. However, the library I'm using does not understand this PEM block, because it expects it to be a PKCS#1 private key. The ASN.1 structure of a PKCS#1 private key