From 70b9e071d137c4c9c9edc4e916fcddfed39aea7d Mon Sep 17 00:00:00 2001
From: Guus Sliepen <guus@meshlink.io>
Date: Thu, 17 Apr 2014 18:37:43 +0200
Subject: [PATCH] Stop using OpenSSL for hashes.

---
 src/Makefile.am     |  6 ++----
 src/invitation.c    | 20 +++++++-------------
 src/protocol_auth.c | 10 ++++------
 3 files changed, 13 insertions(+), 23 deletions(-)

diff --git a/src/Makefile.am b/src/Makefile.am
index 7e352358..2682c4c1 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -30,6 +30,7 @@ chacha_poly1305_SOURCES = \
 
 sptps_test_SOURCES = \
 	logger.c logger.h \
+	prf.c prf.h \
 	sptps.c sptps.h \
 	sptps_test.c \
 	utils.c utils.h \
@@ -43,6 +44,7 @@ sptps_keypair_SOURCES = \
 
 sptps_speed_SOURCES = \
 	logger.c logger.h \
+	prf.c prf.h \
 	sptps.c sptps.h \
 	sptps_speed.c \
 	utils.c utils.h \
@@ -58,7 +60,6 @@ libmeshlink_la_SOURCES = \
 	conf.c conf.h \
 	connection.c connection.h \
 	crypto.h \
-	digest.h \
 	dropin.c dropin.h \
 	ecdh.h \
 	ecdsa.h \
@@ -102,13 +103,11 @@ libmeshlink_la_LIBADD = -lpthread
 
 libmeshlink_la_SOURCES += \
 	openssl/crypto.c \
-	openssl/digest.c openssl/digest.h \
 	ed25519/ecdh.c \
 	ed25519/ecdsa.c \
 	ed25519/ecdsagen.c
 sptps_test_SOURCES += \
 	openssl/crypto.c \
-	openssl/digest.c openssl/digest.h \
 	ed25519/ecdh.c \
 	ed25519/ecdsa.c
 sptps_keypair_SOURCES += \
@@ -116,7 +115,6 @@ sptps_keypair_SOURCES += \
 	ed25519/ecdsagen.c
 sptps_speed_SOURCES += \
 	openssl/crypto.c \
-	openssl/digest.c openssl/digest.h \
 	ed25519/ecdh.c \
 	ed25519/ecdsa.c \
 	ed25519/ecdsagen.c
diff --git a/src/invitation.c b/src/invitation.c
index 6c0b0afb..d027e0d9 100644
--- a/src/invitation.c
+++ b/src/invitation.c
@@ -265,7 +265,7 @@ int cmd_invite(int argc, char *argv[]) {
 		}
 	}
 
-	char hash[25];
+	char hash[64];
 
 	xasprintf(&filename, "%s" SLASH "invitations", confbase);
 	if(mkdir(filename, 0700) && errno != EEXIST) {
@@ -361,10 +361,7 @@ int cmd_invite(int argc, char *argv[]) {
 
 	// Create a hash of the key.
 	char *fingerprint = ecdsa_get_base64_public_key(key);
-	digest_t *digest = digest_open_by_name("sha256", 18);
-	if(!digest)
-		abort();
-	digest_create(digest, fingerprint, strlen(fingerprint), hash);
+	sha512(fingerprint, strlen(fingerprint), hash);
 	b64encode_urlsafe(hash, hash, 18);
 
 	// Create a random cookie for this invitation.
@@ -373,10 +370,10 @@ int cmd_invite(int argc, char *argv[]) {
 
 	// Create a filename that doesn't reveal the cookie itself
 	char buf[18 + strlen(fingerprint)];
-	char cookiehash[25];
+	char cookiehash[64];
 	memcpy(buf, cookie, 18);
 	memcpy(buf + 18, fingerprint, sizeof buf - 18);
-	digest_create(digest, buf, sizeof buf, cookiehash);
+	sha512(buf, sizeof buf, cookiehash);
 	b64encode_urlsafe(cookiehash, cookiehash, 18);
 
 	b64encode_urlsafe(cookie, cookie, 18);
@@ -911,12 +908,9 @@ int cmd_join(int argc, char *argv[]) {
 
 	// Check if the hash of the key he gave us matches the hash in the URL.
 	char *fingerprint = line + 2;
-	digest_t *digest = digest_open_by_name("sha256", 18);
-	if(!digest)
-		abort();
-	char hishash[18];
-	if(!digest_create(digest, fingerprint, strlen(fingerprint), hishash)) {
-		fprintf(stderr, "Could not create digest\n%s\n", line + 2);
+	char hishash[64];
+	if(!sha512(fingerprint, strlen(fingerprint), hishash)) {
+		fprintf(stderr, "Could not create hash\n%s\n", line + 2);
 		return 1;
 	}
 	if(memcmp(hishash, hash, 18)) {
diff --git a/src/protocol_auth.c b/src/protocol_auth.c
index 1255ff08..e667baf0 100644
--- a/src/protocol_auth.c
+++ b/src/protocol_auth.c
@@ -37,6 +37,7 @@
 #include "sptps.h"
 #include "utils.h"
 #include "xalloc.h"
+#include "ed25519/sha512.h"
 
 ecdsa_t *invitation_key = NULL;
 
@@ -182,17 +183,14 @@ static bool receive_invitation_sptps(void *handle, uint8_t type, const char *dat
 		return false;
 
 	// Recover the filename from the cookie and the key
-	digest_t *digest = digest_open_by_name("sha256", 18);
-	if(!digest)
-		abort();
 	char *fingerprint = ecdsa_get_base64_public_key(invitation_key);
+	char hash[64];
 	char hashbuf[18 + strlen(fingerprint)];
 	char cookie[25];
 	memcpy(hashbuf, data, 18);
 	memcpy(hashbuf + 18, fingerprint, sizeof hashbuf - 18);
-	digest_create(digest, hashbuf, sizeof hashbuf, cookie);
-	b64encode_urlsafe(cookie, cookie, 18);
-	digest_close(digest);
+	sha512(hashbuf, sizeof hashbuf, hash);
+	b64encode_urlsafe(hash, cookie, 18);
 	free(fingerprint);
 
 	char filename[PATH_MAX], usedname[PATH_MAX];
-- 
2.39.5