bignum: Add tohex function

1 files changed, 30 insertions, 0 deletions

diff --git a/src/openssl.c b/src/openssl.c
index cb74506..d6bec90 100644
--- a/src/openssl.c
+++ b/src/openssl.c
@@ -1970,6 +1970,35 @@ sslerr:
 } /* bn_todec() */
 
 
+static int bn_tohex(lua_State *L) {
+        BIGNUM *bn = checksimple(L, 1, BIGNUM_CLASS);
+        char *txt = NULL;
+        BIO *bio;
+        BUF_MEM *buf;
+
+        if (!(txt = BN_bn2hex(bn)))
+                goto sslerr;
+
+        /* use GC-visible BIO as temporary buffer */
+        bio = getbio(L);
+
+        if (BIO_puts(bio, txt) < 0)
+                goto sslerr;
+
+        OPENSSL_free(txt);
+        txt = NULL;
+
+        BIO_get_mem_ptr(bio, &buf);
+        lua_pushlstring(L, buf->data, buf->length);
+
+        return 1;
+sslerr:
+        OPENSSL_free(txt);
+
+        return auxL_error(L, auxL_EOPENSSL, "bignum:tohex");
+} /* bn_tohex() */
+
+
 static const luaL_Reg bn_methods[] = {
         { "add",   &bn__add },
         { "sub",   &bn__sub },
@@ -1981,6 +2010,7 @@ static const luaL_Reg bn_methods[] = {
         { "shr",   &bn__shr },
         { "tobin", &bn_tobin },
         { "todec", &bn_todec },
+        { "tohex", &bn_tohex },
         { NULL,    NULL },
 };