Openssl 1.1.0h

crypto/ec/ec_print.c

@@ -0,0 +1,119 @@
+/*
+ * Copyright 2002-2016 The OpenSSL Project Authors. All Rights Reserved.
+ *
+ * Licensed under the OpenSSL license (the "License").  You may not use
+ * this file except in compliance with the License.  You can obtain a copy
+ * in the file LICENSE in the source distribution or at
+ * https://www.openssl.org/source/license.html
+ */
+
+#include <openssl/crypto.h>
+#include "ec_lcl.h"
+
+BIGNUM *EC_POINT_point2bn(const EC_GROUP *group,
+                          const EC_POINT *point,
+                          point_conversion_form_t form,
+                          BIGNUM *ret, BN_CTX *ctx)
+{
+    size_t buf_len = 0;
+    unsigned char *buf;
+
+    buf_len = EC_POINT_point2buf(group, point, form, &buf, ctx);
+
+    if (buf_len == 0)
+        return NULL;
+
+    ret = BN_bin2bn(buf, buf_len, ret);
+
+    OPENSSL_free(buf);
+
+    return ret;
+}
+
+EC_POINT *EC_POINT_bn2point(const EC_GROUP *group,
+                            const BIGNUM *bn, EC_POINT *point, BN_CTX *ctx)
+{
+    size_t buf_len = 0;
+    unsigned char *buf;
+    EC_POINT *ret;
+
+    if ((buf_len = BN_num_bytes(bn)) == 0)
+        return NULL;
+    buf = OPENSSL_malloc(buf_len);
+    if (buf == NULL)
+        return NULL;
+
+    if (!BN_bn2bin(bn, buf)) {
+        OPENSSL_free(buf);
+        return NULL;
+    }
+
+    if (point == NULL) {
+        if ((ret = EC_POINT_new(group)) == NULL) {
+            OPENSSL_free(buf);
+            return NULL;
+        }
+    } else
+        ret = point;
+
+    if (!EC_POINT_oct2point(group, ret, buf, buf_len, ctx)) {
+        if (ret != point)
+            EC_POINT_clear_free(ret);
+        OPENSSL_free(buf);
+        return NULL;
+    }
+
+    OPENSSL_free(buf);
+    return ret;
+}
+
+static const char *HEX_DIGITS = "0123456789ABCDEF";
+
+/* the return value must be freed (using OPENSSL_free()) */
+char *EC_POINT_point2hex(const EC_GROUP *group,
+                         const EC_POINT *point,
+                         point_conversion_form_t form, BN_CTX *ctx)
+{
+    char *ret, *p;
+    size_t buf_len = 0, i;
+    unsigned char *buf = NULL, *pbuf;
+
+    buf_len = EC_POINT_point2buf(group, point, form, &buf, ctx);
+
+    if (buf_len == 0)
+        return NULL;
+
+    ret = OPENSSL_malloc(buf_len * 2 + 2);
+    if (ret == NULL) {
+        OPENSSL_free(buf);
+        return NULL;
+    }
+    p = ret;
+    pbuf = buf;
+    for (i = buf_len; i > 0; i--) {
+        int v = (int)*(pbuf++);
+        *(p++) = HEX_DIGITS[v >> 4];
+        *(p++) = HEX_DIGITS[v & 0x0F];
+    }
+    *p = '\0';
+
+    OPENSSL_free(buf);
+
+    return ret;
+}
+
+EC_POINT *EC_POINT_hex2point(const EC_GROUP *group,
+                             const char *buf, EC_POINT *point, BN_CTX *ctx)
+{
+    EC_POINT *ret = NULL;
+    BIGNUM *tmp_bn = NULL;
+
+    if (!BN_hex2bn(&tmp_bn, buf))
+        return NULL;
+
+    ret = EC_POINT_bn2point(group, tmp_bn, point, ctx);
+
+    BN_clear_free(tmp_bn);
+
+    return ret;
+}