Signature ECDSA on JCOP4 P71

[CuongChu]

I want sign ECDSA on smartcard jcop 4 p71. But it error when build  ECPublicKey and EcPrivateKey. whether JCOP4 P71 does not support ECDSA or do I need to enable it?

[Kan_Li]

Hi @CuongChu ,

Is it possible to share a log for this issue?

Have a great day,
Kan

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[CuongChu]

Hi Kan

My code:

objECDSAPriKey = (ECPrivateKey)KeyBuilder.buildKey(KeyBuilder.TYPE_EC_FP_PRIVATE, KeyBuilder.LENGTH_EC_FP_256, false);
objECDSAPubKey = (ECPublicKey)KeyBuilder.buildKey(KeyBuilder.TYPE_EC_FP_PUBLIC, KeyBuilder.LENGTH_EC_FP_256, false);
objECDSASign = Signature.getInstance(Signature.ALG_ECDSA_SHA_256, false);

objECDSAPubKey.setFieldFP(SecP256k1_P, (short)0, (short)SecP256k1_P.length);
objECDSAPubKey.setA(SecP256k1_A, (short)0, (short)SecP256k1_A.length);
objECDSAPubKey.setB(SecP256k1_B, (short)0, (short)SecP256k1_B.length);
objECDSAPubKey.setG(SecP256k1_G, (short)0, (short)SecP256k1_G.length);
objECDSAPubKey.setR(SecP256k1_N, (short)0, (short)SecP256k1_N.length);
objECDSAPubKey.setK(SecP256k1_H);

objECDSAPriKey.setFieldFP(SecP256k1_P, (short)0, (short)SecP256k1_P.length);
objECDSAPriKey.setA(SecP256k1_A, (short)0, (short)SecP256k1_A.length);
objECDSAPriKey.setB(SecP256k1_B, (short)0, (short)SecP256k1_B.length);
objECDSAPriKey.setG(SecP256k1_G, (short)0, (short)SecP256k1_G.length);
objECDSAPriKey.setR(SecP256k1_N, (short)0, (short)SecP256k1_N.length);
objECDSAPriKey.setK(SecP256k1_H);

objECDSAKeyPair = new KeyPair(objECDSAPubKey,objECDSAPriKey);
objECDSAKeyPair.genKeyPair();

My result of this code:

0x0003

[Kan_Li · Accepted solution]

Hi @CuongChu ,

I have built this code and added some values for the Elliptic curve parameters.

It works fine.  I have attached the project. Here are the project settings I used.

Can you check the configuration as well?

As mentioned CryptoException has value 0x3 raised by genKeyPair equates to NO_SUCH_ALGORITHM:

Please also look at the values of TYPE_EC_FP_PRIVATE and TYPE_EC_FP_PUBLIC and confirm that they equate to 0xc and 0xb respectively in the simulator to confirm correct algorithm is configured.

Hope that helps,

Have a great day,
Kan

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[CuongChu]

I succeeded, thank you very much.