+# if OPENSSL_VERSION_NUMBER < 0x30000000L
+switch (h->method = m)
+ {
+ case HASH_SHA1: h->hashlen = 20; SHA1_Init (&h->u.sha1); break;
+ case HASH_SHA2_256: h->hashlen = 32; SHA256_Init(&h->u.sha2_256); break;
+ case HASH_SHA2_384: h->hashlen = 48; SHA384_Init(&h->u.sha2_512); break;
+ case HASH_SHA2_512: h->hashlen = 64; SHA512_Init(&h->u.sha2_512); break;
+# ifdef EXIM_HAVE_SHA3
+ case HASH_SHA3_224: h->hashlen = 28;
+ EVP_DigestInit(h->u.mctx = EVP_MD_CTX_new(), EVP_sha3_224());
+ break;
+ case HASH_SHA3_256: h->hashlen = 32;
+ EVP_DigestInit(h->u.mctx = EVP_MD_CTX_new(), EVP_sha3_256());
+ break;
+ case HASH_SHA3_384: h->hashlen = 48;
+ EVP_DigestInit(h->u.mctx = EVP_MD_CTX_new(), EVP_sha3_384());
+ break;
+ case HASH_SHA3_512: h->hashlen = 64;
+ EVP_DigestInit(h->u.mctx = EVP_MD_CTX_new(), EVP_sha3_512());
+ break;
+# endif
+ default: h->hashlen = 0; return FALSE;
+ }
+return TRUE;
+
+# else
+EVP_MD * md;
+
+h->hashlen = 0;
+if (!(h->u.mctx = EVP_MD_CTX_new())) return FALSE;