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Add compact2der() method

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This commit is contained in:
sstone
2020-07-02 21:39:33 +02:00
parent 244673b04c
commit 08d1692932
7 changed files with 73 additions and 0 deletions
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35
jni/c/src/fr_acinq_secp256k1_Secp256k1CFunctions.c
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@@ -687,3 +687,38 @@ JNIEXPORT jbyteArray JNICALL Java_fr_acinq_secp256k1_Secp256k1CFunctions_secp256
CHECKRESULT(!result, "secp256k1_ec_pubkey_serialize failed");
return jpubkey;
}
/*
* Class: fr_acinq_secp256k1_Secp256k1CFunctions
* Method: secp256k1_compact_to_der
* Signature: (J[B)[B
*/
JNIEXPORT jbyteArray JNICALL Java_fr_acinq_secp256k1_Secp256k1CFunctions_secp256k1_1compact_1to_1der
(JNIEnv *penv, jclass clazz, jlong jctx, jbyteArray jsig)
{
secp256k1_context* ctx = (secp256k1_context *)jctx;
jbyte *sig;
secp256k1_ecdsa_signature signature;;
unsigned char der[73];
size_t size;
int result = 0;
if (jctx == 0) return 0;
if (jsig == NULL) return 0;
CHECKRESULT((*penv)->GetArrayLength(penv, jsig) != 64, "invalid signature size");
size = (*penv)->GetArrayLength(penv, jsig);
sig = (*penv)->GetByteArrayElements(penv, jsig, 0);
result = secp256k1_ecdsa_signature_parse_compact(ctx, &signature, (unsigned char*)sig);
(*penv)->ReleaseByteArrayElements(penv, jsig, sig, 0);
CHECKRESULT(!result, "secp256k1_ecdsa_signature_parse_compact failed");
size = 73;
result = secp256k1_ecdsa_signature_serialize_der(ctx, der, &size, &signature);
CHECKRESULT(!result, "secp256k1_ecdsa_signature_serialize_der failed");
jsig = (*penv)->NewByteArray(penv, size);
sig = (*penv)->GetByteArrayElements(penv, jsig, 0);
memcpy(sig, der, size);
(*penv)->ReleaseByteArrayElements(penv, jsig, sig, 0);
return jsig;
}