Include SHA512-256 in EVP_get_digestbyname and EVP_MD_do_all.

Change-Id: I25a1a58589ec8843da4d1955d8fec38561f13ec9
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/49125
Reviewed-by: Adam Langley <agl@google.com>

crypto/digest_extra/digest_extra.c

diff --git a/crypto/digest_extra/digest_extra.c b/crypto/digest_extra/digest_extra.c
index a93601c..8cbb28e 100644
--- a/crypto/digest_extra/digest_extra.c
+++ b/crypto/digest_extra/digest_extra.c
@@ -83,6 +83,7 @@
     {NID_sha256, EVP_sha256, SN_sha256, LN_sha256},
     {NID_sha384, EVP_sha384, SN_sha384, LN_sha384},
     {NID_sha512, EVP_sha512, SN_sha512, LN_sha512},
+    {NID_sha512_256, EVP_sha512_256, SN_sha512_256, LN_sha512_256},
     {NID_md5_sha1, EVP_md5_sha1, SN_md5_sha1, LN_md5_sha1},
     // As a remnant of signing |EVP_MD|s, OpenSSL returned the corresponding
     // hash function when given a signature OID. To avoid unintended lax parsing

decrepit/evp/evp_do_all.c

diff --git a/decrepit/evp/evp_do_all.c b/decrepit/evp/evp_do_all.c
index d8023e0..a3fb077 100644
--- a/decrepit/evp/evp_do_all.c
+++ b/decrepit/evp/evp_do_all.c
@@ -78,6 +78,7 @@
   callback(EVP_sha256(), "SHA256", NULL, arg);
   callback(EVP_sha384(), "SHA384", NULL, arg);
   callback(EVP_sha512(), "SHA512", NULL, arg);
+  callback(EVP_sha512_256(), "SHA512-256", NULL, arg);
 
   callback(EVP_md4(), "md4", NULL, arg);
   callback(EVP_md5(), "md5", NULL, arg);
@@ -86,6 +87,7 @@
   callback(EVP_sha256(), "sha256", NULL, arg);
   callback(EVP_sha384(), "sha384", NULL, arg);
   callback(EVP_sha512(), "sha512", NULL, arg);
+  callback(EVP_sha512_256(), "sha512-256", NULL, arg);
 }
 
 void EVP_MD_do_all(void (*callback)(const EVP_MD *cipher, const char *name,