openssl.c

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/*
 * This file is part of the Fun programming language.
 * https://fun-lang.xyz/
 *
 * Copyright 2026 Johannes Findeisen <you@hanez.org>
 * Licensed under the terms of the Apache-2.0 license.
 * https://opensource.org/license/apache-2-0
 */


/*
 * OpenSSL integration helpers (MD5, RIPEMD-160, SHA-256, SHA-512)
 */

#ifdef FUN_WITH_OPENSSL
#include <openssl/evp.h>
/* Always use EVP_MD_get_size; if headers don't declare it, provide a
 * forward declaration to allow linking against OpenSSL libcrypto. */
#ifndef EVP_MD_get_size
int EVP_MD_get_size(const EVP_MD *md);
#endif
#endif
#include <stdlib.h>

static char *fun_openssl_md5_hex(const unsigned char *data, size_t len) {
 static const char hexdig[] = "0123456789abcdef";
 if (!data && len != 0) return NULL;
#ifdef FUN_WITH_OPENSSL
 const EVP_MD *md = EVP_md5();
 if (!md) return NULL;
 int dlen = EVP_MD_get_size(md);
 if (dlen <= 0) return NULL;
 unsigned char *digest = (unsigned char *)malloc((size_t)dlen);
 if (!digest) return NULL;
 unsigned int out_len = 0;
 int ok;
 if (len == 0) {
 // EVP_Digest handles zero-length fine as well
 ok = EVP_Digest(NULL, 0, digest, &out_len, md, NULL);
 } else {
 ok = EVP_Digest(data, len, digest, &out_len, md, NULL);
 }
 if (ok != 1 || (int)out_len != dlen) {
 free(digest);
 return NULL;
 }
 char *hex = (char *)malloc((size_t)dlen * 2 + 1);
 if (!hex) {
 free(digest);
 return NULL;
 }
 for (int i = 0; i < dlen; ++i) {
 hex[2 * i] = hexdig[(digest[i] >> 4) & 0xF];
 hex[2 * i + 1] = hexdig[digest[i] & 0xF];
 }
 hex[dlen * 2] = '\0';
 free(digest);
 return hex;
#else
 char *hex = (char *)malloc(1);
 if (hex) hex[0] = '\0';
 return hex;
#endif
}

static char *fun_openssl_sha256_hex(const unsigned char *data, size_t len) {
 static const char hexdig[] = "0123456789abcdef";
 if (!data && len != 0) return NULL;
#ifdef FUN_WITH_OPENSSL
 const EVP_MD *md = EVP_sha256();
 if (!md) return NULL;
 int dlen = EVP_MD_get_size(md);
 if (dlen <= 0) return NULL;
 unsigned char *digest = (unsigned char *)malloc((size_t)dlen);
 if (!digest) return NULL;
 unsigned int out_len = 0;
 int ok;
 if (len == 0) {
 ok = EVP_Digest(NULL, 0, digest, &out_len, md, NULL);
 } else {
 ok = EVP_Digest(data, len, digest, &out_len, md, NULL);
 }
 if (ok != 1 || (int)out_len != dlen) {
 free(digest);
 return NULL;
 }
 char *hex = (char *)malloc((size_t)dlen * 2 + 1);
 if (!hex) {
 free(digest);
 return NULL;
 }
 for (int i = 0; i < dlen; ++i) {
 hex[2 * i] = hexdig[(digest[i] >> 4) & 0xF];
 hex[2 * i + 1] = hexdig[digest[i] & 0xF];
 }
 hex[dlen * 2] = '\0';
 free(digest);
 return hex;
#else
 char *hex = (char *)malloc(1);
 if (hex) hex[0] = '\0';
 return hex;
#endif
}

static char *fun_openssl_sha512_hex(const unsigned char *data, size_t len) {
 static const char hexdig[] = "0123456789abcdef";
 if (!data && len != 0) return NULL;
#ifdef FUN_WITH_OPENSSL
 const EVP_MD *md = EVP_sha512();
 if (!md) return NULL;
 int dlen = EVP_MD_get_size(md);
 if (dlen <= 0) return NULL;
 unsigned char *digest = (unsigned char *)malloc((size_t)dlen);
 if (!digest) return NULL;
 unsigned int out_len = 0;
 int ok;
 if (len == 0) {
 ok = EVP_Digest(NULL, 0, digest, &out_len, md, NULL);
 } else {
 ok = EVP_Digest(data, len, digest, &out_len, md, NULL);
 }
 if (ok != 1 || (int)out_len != dlen) {
 free(digest);
 return NULL;
 }
 char *hex = (char *)malloc((size_t)dlen * 2 + 1);
 if (!hex) {
 free(digest);
 return NULL;
 }
 for (int i = 0; i < dlen; ++i) {
 hex[2 * i] = hexdig[(digest[i] >> 4) & 0xF];
 hex[2 * i + 1] = hexdig[digest[i] & 0xF];
 }
 hex[dlen * 2] = '\0';
 free(digest);
 return hex;
#else
 char *hex = (char *)malloc(1);
 if (hex) hex[0] = '\0';
 return hex;
#endif
}

static char *fun_openssl_ripemd160_hex(const unsigned char *data, size_t len) {
 static const char hexdig[] = "0123456789abcdef";
 if (!data && len != 0) return NULL;
#ifdef FUN_WITH_OPENSSL
 const EVP_MD *md = EVP_ripemd160();
 if (!md) return NULL;
 int dlen = EVP_MD_get_size(md);
 if (dlen <= 0) return NULL;
 unsigned char *digest = (unsigned char *)malloc((size_t)dlen);
 if (!digest) return NULL;
 unsigned int out_len = 0;
 int ok;
 if (len == 0) {
 ok = EVP_Digest(NULL, 0, digest, &out_len, md, NULL);
 } else {
 ok = EVP_Digest(data, len, digest, &out_len, md, NULL);
 }
 if (ok != 1 || (int)out_len != dlen) {
 free(digest);
 return NULL;
 }
 char *hex = (char *)malloc((size_t)dlen * 2 + 1);
 if (!hex) {
 free(digest);
 return NULL;
 }
 for (int i = 0; i < dlen; ++i) {
 hex[2 * i] = hexdig[(digest[i] >> 4) & 0xF];
 hex[2 * i + 1] = hexdig[digest[i] & 0xF];
 }
 hex[dlen * 2] = '\0';
 free(digest);
 return hex;
#else
 char *hex = (char *)malloc(1);
 if (hex) hex[0] = '\0';
 return hex;
#endif
}