feat(util): add md5_compute()

meson.build

@@ -1,6 +1,7 @@
 project('saltytools', 'c', version: '0.1.0')
 
 libpng_dep = dependency('libpng', fallback: ['libpng', 'libpng_dep'])
+openssl_dep = dependency('openssl', fallback: ['openssl', 'openssl_dep'])
 
 inc = include_directories('.')
 

subprojects/openssl.wrap

@@ -0,0 +1,15 @@
+[wrap-file]
+directory = openssl-3.0.8
+source_url = https://www.openssl.org/source/openssl-3.0.8.tar.gz
+source_filename = openssl-3.0.8.tar.gz
+source_hash = 6c13d2bf38fdf31eac3ce2a347073673f5d63263398f1f69d0df4a41253e4b3e
+patch_filename = openssl_3.0.8-2_patch.zip
+patch_url = https://wrapdb.mesonbuild.com/v2/openssl_3.0.8-2/get_patch
+patch_hash = e84b5fe469e681e3318184157a0c7c43d4cbacd078bb88f506e31569f8f75072
+source_fallback_url = https://github.com/mesonbuild/wrapdb/releases/download/openssl_3.0.8-2/openssl-3.0.8.tar.gz
+wrapdb_version = 3.0.8-2
+
+[provide]
+libcrypto = libcrypto_dep
+libssl = libssl_dep
+openssl = openssl_dep

util/crypto.c

@@ -0,0 +1,63 @@
+#include <assert.h>
+#include <errno.h>
+#include <stddef.h>
+
+#include <openssl/evp.h>
+
+#include "util/crypto.h"
+#include "util/log.h"
+
+int md5_compute(struct md5_hash *dest, const void *bytes, size_t nbytes) {
+  EVP_MD_CTX *ctx;
+  const EVP_MD *md5;
+  unsigned int len;
+  int libr;
+  int r;
+
+  assert(dest != NULL);
+  assert(bytes != NULL);
+
+  ctx = EVP_MD_CTX_new();
+
+  if (ctx == NULL) {
+    r = -ENOMEM;
+
+    goto end;
+  }
+
+  md5 = EVP_md5();
+  libr = EVP_DigestInit_ex(ctx, md5, NULL);
+
+  if (libr != 1) {
+    r = -ENOSYS;
+    log_error(r);
+
+    goto end;
+  }
+
+  libr = EVP_DigestUpdate(ctx, bytes, nbytes);
+
+  if (libr != 1) {
+    r = -ENOSYS;
+    log_error(r);
+
+    goto end;
+  }
+
+  len = sizeof(dest->b);
+  libr = EVP_DigestFinal_ex(ctx, dest->b, &len);
+
+  if (libr != 1 || len != sizeof(dest->b)) {
+    r = -ENOSYS;
+    log_error(r);
+
+    goto end;
+  }
+
+  r = 0;
+
+end:
+  EVP_MD_CTX_free(ctx);
+
+  return r;
+}

util/crypto.h

@@ -0,0 +1,10 @@
+#pragma once
+
+#include <stddef.h>
+#include <stdint.h>
+
+struct md5_hash {
+  uint8_t b[16];
+};
+
+int md5_compute(struct md5_hash *dest, const void *bytes, size_t nbytes);

util/meson.build

@@ -1,8 +1,11 @@
 util_lib = static_library(
   'util',
+  dependencies: [openssl_dep],
   include_directories: [inc],
   c_pch: '../precompiled.h',
   sources: [
+    'crypto.c',
+    'crypto.h',
     'fs.c',
     'fs.h',
     'iobuf.c',