diff --git a/src/package/vieter_package.c b/src/package/vieter_package.c
index cf273d8..d1ef6c4 100644
--- a/src/package/vieter_package.c
+++ b/src/package/vieter_package.c
@@ -123,20 +123,21 @@ vieter_package_error vieter_package_read_archive(vieter_package *pkg, const char
 
 void vieter_package_sha256sum(vieter_package *pkg, char *res) {
 	FILE *f = fopen(pkg->path, "r");
-	fseek(f, 0, SEEK_END);
-	size_t size = ftell(f);
-	rewind(f);
-	unsigned char *in = malloc(size);
-	fread(in, 1, size, f);
-	fclose(f);
+	// Try to read 100KiB at a time
+	unsigned char *in = malloc(102400);
+	// Actual number of bytes read
+	size_t read_size;
 
-	unsigned char hash[32];
 	SHA256_CTX *ctx = malloc(sizeof(SHA256_CTX));
-
 	sha256_init(ctx);
-	sha256_update(ctx, in, size);
+	while ((read_size = fread(in, 1, 102400, f)) != 0) {
+		sha256_update(ctx, in, read_size);
+	}
+	unsigned char hash[SHA256_BLOCK_SIZE];
+
 	sha256_final(ctx, hash);
 
+	fclose(f);
 	free(in);
 	free(ctx);
 
@@ -147,8 +148,8 @@ void vieter_package_sha256sum(vieter_package *pkg, char *res) {
 	unsigned int half_byte = 0;
 	int j = 0;
 
-	// We advance in the string 2 bytes for every one byte of the hash
-	for (int i = 0; i < 32; i++) {
+	// We advance 2 bytes in the string for every one byte of the hash
+	for (int i = 0; i < SHA256_BLOCK_SIZE; i++) {
 		// We transform the first half byte into the second character to keep
 		// each byte from becoming reversed in the final string
 		half_byte = hash[i] & 0b1111;
@@ -206,11 +207,11 @@ char *vieter_package_to_description(vieter_package *pkg) {
 	ADD_STRING("\n\n%%CSIZE%%\n%ld", csize);
 	ADD_STRING("\n\n%%ISIZE%%\n%ld", size);
 
-	char checksum[65];
+	char checksum[SHA256_BLOCK_SIZE * 2 + 1];
 	vieter_package_sha256sum(pkg, checksum);
 
-	snprintf(aux, SMALL_BUFF_SIZE, "\n\n%%SHA256SUM%%\n%s", checksum);
-	if (buff_size < strlen(description) + SMALL_BUFF_SIZE + 1) {
+	snprintf(aux, small_buff_size, "\n\n%%SHA256SUM%%\n%s", checksum);
+	if (buff_size < strlen(description) + small_buff_size + 1) {
 		description = realloc(description, buff_size * 2);
 		buff_size *= 2;
 	}