Port ssl3_get_key_exchange to CBS.
Also tidy up some variable names and update RSA_verify call for it no longer
returning -1. Add CBS helper functions for dealing with C strings.
Change-Id: Ibc398d27714744f5d99d4f94ae38210cbc89471a
Reviewed-on: https://boringssl-review.googlesource.com/1164
Reviewed-by: Adam Langley <agl@google.com>
diff --git a/include/openssl/bytestring.h b/include/openssl/bytestring.h
index 9c908a2..631acdd 100644
--- a/include/openssl/bytestring.h
+++ b/include/openssl/bytestring.h
@@ -60,6 +60,19 @@
* |*out_ptr| will be NULL. */
int CBS_stow(const CBS *cbs, uint8_t **out_ptr, size_t *out_len);
+/* CBS_strdup copies the current contents of |cbs| into |*out_ptr| as a
+ * NUL-terminated C string. If |*out_ptr| is not NULL, the contents are freed
+ * with OPENSSL_free. It returns one on success and zero on allocation
+ * failure. On success, |*out_ptr| should be freed with OPENSSL_free.
+ *
+ * NOTE: If |cbs| contains NUL bytes, the string will be truncated. Call
+ * |CBS_contains_zero_byte(cbs)| to check for NUL bytes. */
+int CBS_strdup(const CBS *cbs, char **out_ptr);
+
+/* CBS_contains_zero_byte returns one if the current contents of |cbs| contains
+ * a NUL byte and zero otherwise. */
+int CBS_contains_zero_byte(const CBS *cbs);
+
/* CBS_get_u8 sets |*out| to the next uint8_t from |cbs| and advances |cbs|. It
* returns one on success and zero on error. */
int CBS_get_u8(CBS *cbs, uint8_t *out);
