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Export Schnorr signature API (#32)

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Implement Schnorr signatures (BIP 340)
This commit is contained in:
Fabrice Drouin
2021-11-23 17:38:46 +01:00
committed by GitHub
parent 5ee01ea526
commit ac7d4983d5
11 changed files with 232 additions and 6 deletions
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84
jni/c/src/fr_acinq_secp256k1_Secp256k1CFunctions.c
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@@ -4,6 +4,7 @@
#include "include/secp256k1.h"
#include "include/secp256k1_ecdh.h"
#include "include/secp256k1_recovery.h"
#include "include/secp256k1_schnorrsig.h"
#include "fr_acinq_secp256k1_Secp256k1CFunctions.h"
#define SIG_FORMAT_UNKNOWN 0
@@ -666,3 +667,86 @@ JNIEXPORT jbyteArray JNICALL Java_fr_acinq_secp256k1_Secp256k1CFunctions_secp256
(*penv)->ReleaseByteArrayElements(penv, jsig, sig, 0);
return jsig;
}
/*
* Class: fr_acinq_secp256k1_Secp256k1CFunctions
* Method: secp256k1_schnorrsig_sign
* Signature: (J[B[B[B)[B
*/
JNIEXPORT jbyteArray JNICALL Java_fr_acinq_secp256k1_Secp256k1CFunctions_secp256k1_1schnorrsig_1sign
(JNIEnv *penv, jclass clazz, jlong jctx, jbyteArray jmsg, jbyteArray jseckey, jbyteArray jauxrand32)
{
secp256k1_context* ctx = (secp256k1_context *)jctx;
jbyte *seckey, *msg, *sig, *auxrand32 = NULL;
secp256k1_keypair keypair;
unsigned char signature[64];
int result = 0;
jbyteArray jsig;
if (jctx == 0) return NULL;
if (jmsg == NULL) return NULL;
if (jseckey == NULL) return NULL;
CHECKRESULT((*penv)->GetArrayLength(penv, jseckey) != 32, "secret key must be 32 bytes");
CHECKRESULT((*penv)->GetArrayLength(penv, jmsg) != 32, "message must be 32 bytes");
if (jauxrand32 != 0) {
CHECKRESULT((*penv)->GetArrayLength(penv, jauxrand32) != 32, "auxiliary random data must be 32 bytes");
}
seckey = (*penv)->GetByteArrayElements(penv, jseckey, 0);
result = secp256k1_keypair_create(ctx, &keypair, seckey);
(*penv)->ReleaseByteArrayElements(penv, jseckey, seckey, 0);
CHECKRESULT(!result, "secp256k1_keypair_create failed");
msg = (*penv)->GetByteArrayElements(penv, jmsg, 0);
if (jauxrand32 != 0) {
auxrand32 = (*penv)->GetByteArrayElements(penv, jauxrand32, 0);
}
result = secp256k1_schnorrsig_sign(ctx, signature, (unsigned char*)msg, &keypair, auxrand32);
(*penv)->ReleaseByteArrayElements(penv, jmsg, msg, 0);
if (auxrand32 != 0) {
(*penv)->ReleaseByteArrayElements(penv, jauxrand32, auxrand32, 0);
}
CHECKRESULT(!result, "secp256k1_schnorrsig_sign failed");
jsig = (*penv)->NewByteArray(penv, 64);
sig = (*penv)->GetByteArrayElements(penv, jsig, 0);
memcpy(sig, signature, 64);
(*penv)->ReleaseByteArrayElements(penv, jsig, sig, 0);
return jsig;
}
/*
* Class: fr_acinq_secp256k1_Secp256k1CFunctions
* Method: secp256k1_schnorrsig_verify
* Signature: (J[B[B[B)I
*/
JNIEXPORT jint JNICALL Java_fr_acinq_secp256k1_Secp256k1CFunctions_secp256k1_1schnorrsig_1verify
(JNIEnv *penv, jclass clazz, jlong jctx, jbyteArray jsig, jbyteArray jmsg, jbyteArray jpubkey)
{
secp256k1_context* ctx = (secp256k1_context *)jctx;
jbyte *pub, *msg, *sig;
secp256k1_xonly_pubkey pubkey;
int result = 0;
if (jctx == 0) return 0;
if (jsig == NULL) return 0;
if (jmsg == NULL) return 0;
if (jpubkey == NULL) return 0;
CHECKRESULT((*penv)->GetArrayLength(penv, jsig) != 64, "signature must be 64 bytes");
CHECKRESULT((*penv)->GetArrayLength(penv, jpubkey) != 32, "public key must be 32 bytes");
CHECKRESULT((*penv)->GetArrayLength(penv, jmsg) != 32, "message must be 32 bytes");
pub = (*penv)->GetByteArrayElements(penv, jpubkey, 0);
result = secp256k1_xonly_pubkey_parse(ctx, &pubkey, (unsigned char*)pub);
(*penv)->ReleaseByteArrayElements(penv, jpubkey, pub, 0);
CHECKRESULT(!result, "secp256k1_ec_pubkey_parse failed");
sig = (*penv)->GetByteArrayElements(penv, jsig, 0);
msg = (*penv)->GetByteArrayElements(penv, jmsg, 0);
result = secp256k1_schnorrsig_verify(ctx, (unsigned char*)sig, (unsigned char*)msg, 32, &pubkey);
(*penv)->ReleaseByteArrayElements(penv, jsig, sig, 0);
(*penv)->ReleaseByteArrayElements(penv, jmsg, msg, 0);
return result;
}