Params: change UTF8 construct calls to avoid explicit strlen(3) calls.

It is better, safer and smaller to let the library routine handle the
strlen(3) call.

Added a note to the documentation suggesting this.

Reviewed-by: Tim Hudson <tjh@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/11019)

1 files changed, 1 insertions, 1 deletions

diff --git a/ssl/t1_enc.c b/ssl/t1_enc.c
index 5937d91e60..59bf789af0 100644
--- a/ssl/t1_enc.c
+++ b/ssl/t1_enc.c
@@ -55,7 +55,7 @@ static int tls1_PRF(SSL *s,
         goto err;
     mdname = EVP_MD_name(md);
     *p++ = OSSL_PARAM_construct_utf8_string(OSSL_KDF_PARAM_DIGEST,
-                                            (char *)mdname, strlen(mdname) + 1);
+                                            (char *)mdname, 0);
     *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_SECRET,
                                              (unsigned char *)sec,
                                              (size_t)slen);