char * host_hash(const char *host, const char *name_from_hostfile, u_int src_len) { struct ssh_hmac_ctx *ctx; u_char salt[256], result[256]; char uu_salt[512], uu_result[512]; static char encoded[1024]; u_int i, len; len = ssh_digest_bytes(SSH_DIGEST_SHA1); if (name_from_hostfile == NULL) { /* Create new salt */ for (i = 0; i < len; i++) salt[i] = arc4random(); } else { /* Extract salt from known host entry */ if (extract_salt(name_from_hostfile, src_len, salt, sizeof(salt)) == -1) return (NULL); } if ((ctx = ssh_hmac_start(SSH_DIGEST_SHA1)) == NULL || ssh_hmac_init(ctx, salt, len) < 0 || ssh_hmac_update(ctx, host, strlen(host)) < 0 || ssh_hmac_final(ctx, result, sizeof(result))) fatal("%s: ssh_hmac failed", __func__); ssh_hmac_free(ctx); if (__b64_ntop(salt, len, uu_salt, sizeof(uu_salt)) == -1 || __b64_ntop(result, len, uu_result, sizeof(uu_result)) == -1) fatal("%s: __b64_ntop failed", __func__); snprintf(encoded, sizeof(encoded), "%s%s%c%s", HASH_MAGIC, uu_salt, HASH_DELIM, uu_result); return (encoded); }
char * host_hash(const char *host, const char *name_from_hostfile, u_int src_len) { const EVP_MD *md = EVP_sha1(); HMAC_CTX mac_ctx; u_char salt[256], result[256]; char uu_salt[512], uu_result[512]; static char encoded[1024]; u_int i, len; len = EVP_MD_size(md); if (name_from_hostfile == NULL) { /* Create new salt */ for (i = 0; i < len; i++) salt[i] = arc4random(); } else { /* Extract salt from known host entry */ if (extract_salt(name_from_hostfile, src_len, salt, sizeof(salt)) == -1) return (NULL); } HMAC_Init(&mac_ctx, salt, len, md); HMAC_Update(&mac_ctx, __UNCONST(host), strlen(host)); HMAC_Final(&mac_ctx, result, NULL); HMAC_cleanup(&mac_ctx); if (__b64_ntop(salt, len, uu_salt, sizeof(uu_salt)) == -1 || __b64_ntop(result, len, uu_result, sizeof(uu_result)) == -1) fatal("host_hash: __b64_ntop failed"); snprintf(encoded, sizeof(encoded), "%s%s%c%s", HASH_MAGIC, uu_salt, HASH_DELIM, uu_result); return (encoded); }