ecdsa

来源： https://stackoverflow.com/questions/59078889/ecdsa-verify-signature-in-c-sharp-using-public-key-and-signature-from-java

问题 BackGround I have a server which uses MSRCrypto to sign my nonce. I need to verify that nonce in Java. It is well know that MSRCrypto sends it in P1363 format and Java Library requires it in DER format. I cannot change the server code as I am the client. The server is using SHA386withECDSA What I need 1) Can someone provide me with exact code snippet to convert it from P1363 format to ASN.1 and vice-versa(ASN.1 to P1363) in Java . I tried a few code snippets but was not able to make it work

问题 I want load the PEM using .net framework (not .netcore) -----BEGIN ENCRYPTED PRIVATE KEY----- MIHs........................................................CAAw DAYI........................................................gZAf Y/Iu........................................................X7DZ ZKoE........................................................OYQQ 3ZST........................................................A2E= -----END ENCRYPTED PRIVATE KEY----- I tried to use the following code using

问题 I tried to export private key from certificate store by CNG API. It work fine when export RSA private key, but failed in EC private key. The code failed in NCryptExportKey() with 0x80090029 . Is there any document from MS said: Export EC private key not support? or any sample code? Here is my code: NCRYPT_KEY_HANDLE hKey = NULL; SECURITY_STATUS secStatus = ERROR_SUCCESS; NTSTATUS status = STATUS_UNSUCCESSFUL; DWORD dwKeySpec, cbData = 0, cbBlob = 0, KeyPolicy = 0; PBYTE pbHash = NULL, pbBlob

问题 On the bitcoin wiki I found that bitcoin uses the ECDSA algorithm with the Secp256k1 curve. Relevant Links: https://en.bitcoin.it/wiki/Elliptic_Curve_Digital_Signature_Algorithm https://en.bitcoin.it/wiki/Secp256k1 On the first link, it says private key should be 32 bytes, public key 64 bytes, and the signature typically between 71-73 bytes. It says the signature can be smaller with small probability. However, when I run the following python3 code >>> from ecdsa import SigningKey, SECP256k1 >

问题 I'm generating a key pair using the secp256k1 curve. Then I'm using the private key to sign a random String: byte[] content = "random string".getBytes(); Signature dsa = Signature.getInstance("SHA256withECDSA"); dsa.initSign(privateKey); dsa.update(content); byte[] signature = dsa.sign(); The signature byte array has the following content: [48, 68, 2, 32, 11, 25, 119, -64, -107, 53, -84, 65, -18, -81, -56, 34, 11, 29, 120, 38, -102, 105, -89, -9, -46, -28, 91, 59, -74, -103, -53, 117, 81, -37

问题 I have to verify a certificate. I'm not an expert of cryptography, so probably I did something (or everything :) ) wrong. When the code reach the last step ( boolean b = sig.verify(CertSign); ), it fires an exception: java.security.SignatureException: error decoding signature bytes . Could someone help me to figure out what I'm doing wrong? The following is a test code that shows the problem: private void test() { byte [] CertBody = new byte[]{(byte)0x7F,(byte)0x4E,(byte)0x81,(byte)0x82,

问题 I have to verify a certificate. I'm not an expert of cryptography, so probably I did something (or everything :) ) wrong. When the code reach the last step ( boolean b = sig.verify(CertSign); ), it fires an exception: java.security.SignatureException: error decoding signature bytes . Could someone help me to figure out what I'm doing wrong? The following is a test code that shows the problem: private void test() { byte [] CertBody = new byte[]{(byte)0x7F,(byte)0x4E,(byte)0x81,(byte)0x82,

问题 I'm trying to implement the signing code using ECDSA. But I always get a Error SW (6F00) during install phase. I tried by changing parameters several times. (ex. ALG_EC_FP / ALG_EC_F2M, LENGTH_EC_FP_xxx / LENGTH_EC_F2M_xxx) Could you tell me my mistake in my code below. (Ver - JCDK 2.2.1, JDK 1.4.2) package Test; import javacard.framework.*; import javacard.security.*; import javacardx.crypto.*; public class Test extends Applet{ private byte[] PLAINTEXT ; private ECPrivateKey objECDSAPriKey

问题 I'm running out of ideas as to why my sample code won't verify the given EC public key, signature and message. I've converted the signature to ASN.1 format which is 70 bytes and the public key is 64 bytes plus uncompressed byte (0x04). I've also tried converting the message to SHA256 hash but that didn't work as well. The publicKey hex value is used to construct a ECPublicKey with prime256v1 curve. The signature is base64 decoded then formatted to ASN.1. I don't see what I could be doing