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libvieter
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refactor: Hashing function now streams data into hasher instead of doing it in one go.

GreekStapler 2023-01-31 21:09:47 +00:00
parent 41fabe21a2
commit 031e28ed33
1 changed files with 15 additions and 14 deletions
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29
src/package/vieter_package.c
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@ -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;
}