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Diffstat (limited to 'lib/curve25519-donna/contrib/Curve25519Donna.c')
-rw-r--r--lib/curve25519-donna/contrib/Curve25519Donna.c118
1 files changed, 118 insertions, 0 deletions
diff --git a/lib/curve25519-donna/contrib/Curve25519Donna.c b/lib/curve25519-donna/contrib/Curve25519Donna.c
new file mode 100644
index 0000000..71b816c
--- /dev/null
+++ b/lib/curve25519-donna/contrib/Curve25519Donna.c
@@ -0,0 +1,118 @@
+/*
+ James Robson
+ Public domain.
+*/
+
+#include "Curve25519Donna.h"
+#include <stdio.h>
+#include <stdlib.h>
+
+extern void curve25519_donna(unsigned char *output, const unsigned char *a,
+ const unsigned char *b);
+
+unsigned char*
+as_unsigned_char_array(JNIEnv* env, jbyteArray array, int* len);
+
+jbyteArray as_byte_array(JNIEnv* env, unsigned char* buf, int len);
+
+
+jbyteArray as_byte_array(JNIEnv* env, unsigned char* buf, int len) {
+ jbyteArray array = (*env)->NewByteArray(env, len);
+ (*env)->SetByteArrayRegion(env, array, 0, len, (jbyte*)buf);
+
+ //int i;
+ //for (i = 0;i < len;++i) printf("%02x",(unsigned int) buf[i]); printf(" ");
+ //printf("\n");
+
+ return array;
+}
+
+unsigned char*
+as_unsigned_char_array(JNIEnv* env, jbyteArray array, int* len) {
+
+ *len = (*env)->GetArrayLength(env, array);
+ unsigned char* buf = (unsigned char*)calloc(*len+1, sizeof(char));
+ (*env)->GetByteArrayRegion (env, array, 0, *len, (jbyte*)buf);
+ return buf;
+
+}
+
+JNIEXPORT jbyteArray JNICALL Java_Curve25519Donna_curve25519Donna
+ (JNIEnv *env, jobject obj, jbyteArray a, jbyteArray b) {
+
+ unsigned char o[32] = {0};
+ int l1, l2;
+ unsigned char* a1 = as_unsigned_char_array(env, a, &l1);
+ unsigned char* b1 = as_unsigned_char_array(env, b, &l2);
+
+ if ( !(l1 == 32 && l2 == 32) ) {
+ fprintf(stderr, "Error, must be length 32");
+ return NULL;
+ }
+
+
+ curve25519_donna(o, (const unsigned char*)a1, (const unsigned char*)b1);
+
+ free(a1);
+ free(b1);
+
+ return as_byte_array(env, (unsigned char*)o, 32);
+}
+
+JNIEXPORT jbyteArray JNICALL Java_Curve25519Donna_makePrivate
+ (JNIEnv *env, jobject obj, jbyteArray secret) {
+
+ int len;
+ unsigned char* k = as_unsigned_char_array(env, secret, &len);
+
+ if (len != 32) {
+ fprintf(stderr, "Error, must be length 32");
+ return NULL;
+ }
+
+ k[0] &= 248;
+ k[31] &= 127;
+ k[31] |= 64;
+ return as_byte_array(env, k, 32);
+}
+
+JNIEXPORT jbyteArray JNICALL Java_Curve25519Donna_getPublic
+ (JNIEnv *env, jobject obj, jbyteArray privkey) {
+
+ int len;
+ unsigned char* private = as_unsigned_char_array(env, privkey, &len);
+
+ if (len != 32) {
+ fprintf(stderr, "Error, must be length 32");
+ return NULL;
+ }
+
+ unsigned char pubkey[32];
+ unsigned char basepoint[32] = {9};
+
+ curve25519_donna(pubkey, private, basepoint);
+ return as_byte_array(env, (unsigned char*)pubkey, 32);
+}
+
+JNIEXPORT jbyteArray JNICALL Java_Curve25519Donna_makeSharedSecret
+ (JNIEnv *env, jobject obj, jbyteArray privkey, jbyteArray their_pubkey) {
+
+ unsigned char shared_secret[32];
+
+ int l1, l2;
+ unsigned char* private = as_unsigned_char_array(env, privkey, &l1);
+ unsigned char* pubkey = as_unsigned_char_array(env, their_pubkey, &l2);
+
+ if ( !(l1 == 32 && l2 == 32) ) {
+ fprintf(stderr, "Error, must be length 32");
+ return NULL;
+ }
+
+ curve25519_donna(shared_secret, private, pubkey);
+ return as_byte_array(env, (unsigned char*)shared_secret, 32);
+}
+
+JNIEXPORT void JNICALL Java_Curve25519Donna_helowrld
+ (JNIEnv *env, jobject obj) {
+ printf("helowrld\n");
+}