wrapper: Add more evp functions.

include/libssh/libcrypto.h

@@ -38,6 +38,9 @@ typedef SHA_CTX* SHACTX;
 typedef SHA256_CTX* SHA256CTX;
 typedef MD5_CTX*  MD5CTX;
 typedef HMAC_CTX* HMACCTX;
+#ifdef HAVE_ECC
+typedef EVP_MD_CTX *EVPCTX;
+#endif
 
 #define SHA_DIGEST_LEN SHA_DIGEST_LENGTH
 #ifdef MD5_DIGEST_LEN

include/libssh/wrapper.h

@@ -53,6 +53,9 @@ void sha1(unsigned char *digest,int len,unsigned char *hash);
 void sha256(unsigned char *digest, int len, unsigned char *hash);
 
 void evp(int nid, unsigned char *digest, int len, unsigned char *hash, unsigned int *hlen);
+EVPCTX evp_init(int nid);
+void evp_update(EVPCTX ctx, const void *data, unsigned long len);
+void evp_final(EVPCTX ctx, unsigned char *md, unsigned int *mdlen);
 
 ssh_mac_ctx ssh_mac_ctx_init(enum ssh_mac_e type);
 void ssh_mac_update(ssh_mac_ctx ctx, const void *data, unsigned long len);

src/libcrypto.c

@@ -123,6 +123,30 @@ void evp(int nid, unsigned char *digest, int len, unsigned char *hash, unsigned
     EVP_DigestUpdate(&md, digest, len);
     EVP_DigestFinal(&md, hash, hlen);
 }
+
+EVPCTX evp_init(int nid)
+{
+    const EVP_MD *evp_md = nid_to_evpmd(nid);
+
+    EVPCTX ctx = malloc(sizeof(EVP_MD_CTX));
+    if (ctx == NULL) {
+        return NULL;
+    }
+
+    EVP_DigestInit(ctx, evp_md);
+
+    return ctx;
+}
+
+void evp_update(EVPCTX ctx, const void *data, unsigned long len)
+{
+    EVP_DigestUpdate(ctx, data, len);
+}
+
+void evp_final(EVPCTX ctx, unsigned char *md, unsigned int *mdlen)
+{
+    EVP_DigestFinal(ctx, md, mdlen);
+}
 #endif
 
 SHA256CTX sha256_init(void){