mirror of https://git.matrix.org/git/olm.git
119 lines
3.1 KiB
C
119 lines
3.1 KiB
C
/*
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James Robson
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Public domain.
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*/
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#include "Curve25519Donna.h"
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#include <stdio.h>
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#include <stdlib.h>
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extern void curve25519_donna(unsigned char *output, const unsigned char *a,
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const unsigned char *b);
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unsigned char*
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as_unsigned_char_array(JNIEnv* env, jbyteArray array, int* len);
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jbyteArray as_byte_array(JNIEnv* env, unsigned char* buf, int len);
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jbyteArray as_byte_array(JNIEnv* env, unsigned char* buf, int len) {
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jbyteArray array = (*env)->NewByteArray(env, len);
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(*env)->SetByteArrayRegion(env, array, 0, len, (jbyte*)buf);
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//int i;
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//for (i = 0;i < len;++i) printf("%02x",(unsigned int) buf[i]); printf(" ");
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//printf("\n");
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return array;
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}
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unsigned char*
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as_unsigned_char_array(JNIEnv* env, jbyteArray array, int* len) {
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*len = (*env)->GetArrayLength(env, array);
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unsigned char* buf = (unsigned char*)calloc(*len+1, sizeof(char));
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(*env)->GetByteArrayRegion (env, array, 0, *len, (jbyte*)buf);
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return buf;
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}
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JNIEXPORT jbyteArray JNICALL Java_Curve25519Donna_curve25519Donna
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(JNIEnv *env, jobject obj, jbyteArray a, jbyteArray b) {
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unsigned char o[32] = {0};
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int l1, l2;
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unsigned char* a1 = as_unsigned_char_array(env, a, &l1);
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unsigned char* b1 = as_unsigned_char_array(env, b, &l2);
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if ( !(l1 == 32 && l2 == 32) ) {
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fprintf(stderr, "Error, must be length 32");
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return NULL;
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}
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curve25519_donna(o, (const unsigned char*)a1, (const unsigned char*)b1);
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free(a1);
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free(b1);
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return as_byte_array(env, (unsigned char*)o, 32);
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}
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JNIEXPORT jbyteArray JNICALL Java_Curve25519Donna_makePrivate
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(JNIEnv *env, jobject obj, jbyteArray secret) {
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int len;
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unsigned char* k = as_unsigned_char_array(env, secret, &len);
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if (len != 32) {
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fprintf(stderr, "Error, must be length 32");
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return NULL;
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}
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k[0] &= 248;
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k[31] &= 127;
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k[31] |= 64;
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return as_byte_array(env, k, 32);
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}
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JNIEXPORT jbyteArray JNICALL Java_Curve25519Donna_getPublic
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(JNIEnv *env, jobject obj, jbyteArray privkey) {
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int len;
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unsigned char* private = as_unsigned_char_array(env, privkey, &len);
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if (len != 32) {
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fprintf(stderr, "Error, must be length 32");
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return NULL;
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}
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unsigned char pubkey[32];
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unsigned char basepoint[32] = {9};
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curve25519_donna(pubkey, private, basepoint);
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return as_byte_array(env, (unsigned char*)pubkey, 32);
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}
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JNIEXPORT jbyteArray JNICALL Java_Curve25519Donna_makeSharedSecret
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(JNIEnv *env, jobject obj, jbyteArray privkey, jbyteArray their_pubkey) {
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unsigned char shared_secret[32];
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int l1, l2;
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unsigned char* private = as_unsigned_char_array(env, privkey, &l1);
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unsigned char* pubkey = as_unsigned_char_array(env, their_pubkey, &l2);
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if ( !(l1 == 32 && l2 == 32) ) {
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fprintf(stderr, "Error, must be length 32");
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return NULL;
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}
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curve25519_donna(shared_secret, private, pubkey);
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return as_byte_array(env, (unsigned char*)shared_secret, 32);
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}
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JNIEXPORT void JNICALL Java_Curve25519Donna_helowrld
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(JNIEnv *env, jobject obj) {
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printf("helowrld\n");
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}
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