+void EVP_MD_CTX_init(EVP_MD_CTX *ctx);
+int EVP_MD_CTX_cleanup(EVP_MD_CTX *ctx);
+EVP_MD_CTX *EVP_MD_CTX_create(void);
+void EVP_MD_CTX_destroy(EVP_MD_CTX *ctx);
+int EVP_MD_CTX_copy_ex(EVP_MD_CTX *out,const EVP_MD_CTX *in);
+#define EVP_MD_CTX_set_flags(ctx,flgs) ((ctx)->flags|=(flgs))
+#define EVP_MD_CTX_clear_flags(ctx,flgs) ((ctx)->flags&=~(flgs))
+#define EVP_MD_CTX_test_flags(ctx,flgs) ((ctx)->flags&(flgs))
+int EVP_DigestInit_ex(EVP_MD_CTX *ctx, const EVP_MD *type, ENGINE *impl);
+int EVP_DigestUpdate(EVP_MD_CTX *ctx,const void *d,
+ size_t cnt);
+int EVP_DigestFinal_ex(EVP_MD_CTX *ctx,unsigned char *md,unsigned int *s);
+int EVP_Digest(const void *data, size_t count,
+ unsigned char *md, unsigned int *size, const EVP_MD *type, ENGINE *impl);