diff -Nurp old/ext/digest/digest.h new/ext/digest/digest.h
--- old/ext/digest/digest.h	2017-06-21 12:56:09.007011362 -0400
+++ new/ext/digest/digest.h	2017-06-21 12:56:32.458975554 -0400
@@ -31,6 +31,26 @@ typedef struct {
     rb_digest_hash_finish_func_t finish_func;
 } rb_digest_metadata_t;
 
+#define DEFINE_INIT_FUNC_FOR_EVP(upper_name, lower_name) \
+int \
+rb_digest_##upper_name##_evp_init(upper_name##_CTX* ctx) \
+{ \
+  SSL_load_error_strings(); \
+  EVP_MD_CTX *md_ctx = EVP_MD_CTX_create(); \
+ \
+  if(!EVP_DigestInit_ex(md_ctx, EVP_##lower_name(), NULL)) { \
+    const char *error_message; \
+    EVP_MD_CTX_destroy(md_ctx); \
+ \
+    error_message = ERR_reason_error_string(ERR_peek_last_error()); \
+    rb_raise(rb_eRuntimeError, error_message); \
+  } \
+  *ctx = *(upper_name##_CTX*)md_ctx->md_data; \
+  EVP_MD_CTX_destroy(md_ctx); \
+ \
+  return 1; \
+}
+
 #define DEFINE_UPDATE_FUNC_FOR_UINT(name) \
 void \
 rb_digest_##name##_update(void *ctx, unsigned char *ptr, size_t size) \
diff -Nurp old/ext/digest/md5/md5ossl.h new/ext/digest/md5/md5ossl.h
--- old/ext/digest/md5/md5ossl.h	2017-06-21 12:56:09.007011362 -0400
+++ new/ext/digest/md5/md5ossl.h	2017-06-21 12:56:32.458975554 -0400
@@ -5,9 +5,15 @@
 
 #include <stddef.h>
 #include <openssl/md5.h>
+#include <openssl/ssl.h>
+#include <openssl/err.h>
 
 #define MD5_BLOCK_LENGTH	MD5_CBLOCK
 
+static DEFINE_INIT_FUNC_FOR_EVP(MD5, md5)
+#undef MD5_Init
+#define MD5_Init rb_digest_MD5_evp_init
+
 static DEFINE_FINISH_FUNC_FROM_FINAL(MD5)
 #undef MD5_Finish
 #define MD5_Finish rb_digest_MD5_finish
diff -Nurp old/ext/digest/rmd160/rmd160ossl.h new/ext/digest/rmd160/rmd160ossl.h
--- old/ext/digest/rmd160/rmd160ossl.h	2017-06-21 12:56:09.007011362 -0400
+++ new/ext/digest/rmd160/rmd160ossl.h	2017-06-21 12:56:32.458975554 -0400
@@ -5,6 +5,8 @@
 
 #include <stddef.h>
 #include <openssl/ripemd.h>
+#include <openssl/ssl.h>
+#include <openssl/err.h>
 
 #define RMD160_CTX	RIPEMD160_CTX
 
@@ -14,6 +16,10 @@
 #define RMD160_BLOCK_LENGTH		RIPEMD160_CBLOCK
 #define RMD160_DIGEST_LENGTH		RIPEMD160_DIGEST_LENGTH
 
+static DEFINE_INIT_FUNC_FOR_EVP(RIPEMD160, ripemd160)
+#undef RMD160_Init
+#define RMD160_Init rb_digest_RIPEMD160_evp_init
+
 static DEFINE_FINISH_FUNC_FROM_FINAL(RIPEMD160)
 #define RMD160_Finish rb_digest_RIPEMD160_finish
 
diff -Nurp old/ext/digest/sha1/sha1ossl.h new/ext/digest/sha1/sha1ossl.h
--- old/ext/digest/sha1/sha1ossl.h	2017-06-21 12:56:09.007011362 -0400
+++ new/ext/digest/sha1/sha1ossl.h	2017-06-21 12:56:32.458975554 -0400
@@ -5,6 +5,8 @@
 
 #include <stddef.h>
 #include <openssl/sha.h>
+#include <openssl/ssl.h>
+#include <openssl/err.h>
 
 #define SHA1_CTX	SHA_CTX
 
@@ -15,6 +17,10 @@
 #endif
 #define SHA1_DIGEST_LENGTH	SHA_DIGEST_LENGTH
 
+static DEFINE_INIT_FUNC_FOR_EVP(SHA1, sha1)
+#undef SHA1_Init
+#define SHA1_Init rb_digest_SHA1_evp_init
+
 static DEFINE_FINISH_FUNC_FROM_FINAL(SHA1)
 #undef SHA1_Finish
 #define SHA1_Finish rb_digest_SHA1_finish
diff -Nurp old/ext/digest/sha2/sha2ossl.h new/ext/digest/sha2/sha2ossl.h
--- old/ext/digest/sha2/sha2ossl.h	2017-06-21 12:56:09.007011362 -0400
+++ new/ext/digest/sha2/sha2ossl.h	2017-06-21 12:56:32.458975554 -0400
@@ -3,6 +3,8 @@
 
 #include <stddef.h>
 #include <openssl/sha.h>
+#include <openssl/ssl.h>
+#include <openssl/err.h>
 
 #define SHA256_BLOCK_LENGTH	SHA256_CBLOCK
 #define SHA384_BLOCK_LENGTH	SHA512_CBLOCK
@@ -14,6 +16,16 @@
 
 typedef SHA512_CTX SHA384_CTX;
 
+#undef SHA256_Init
+#undef SHA384_Init
+#undef SHA512_Init
+#define SHA256_Init rb_digest_SHA256_evp_init
+#define SHA384_Init rb_digest_SHA384_evp_init
+#define SHA512_Init rb_digest_SHA512_evp_init
+static DEFINE_INIT_FUNC_FOR_EVP(SHA256, sha256)
+static DEFINE_INIT_FUNC_FOR_EVP(SHA384, sha384)
+static DEFINE_INIT_FUNC_FOR_EVP(SHA512, sha512)
+
 #undef SHA256_Finish
 #undef SHA384_Finish
 #undef SHA512_Finish