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- /* Copyright 2001,2002,2003 Roger Dingledine, Matej Pfajfar. */
- /* See LICENSE for licensing information */
- /* $Id$ */
- #include "orconfig.h"
- #ifdef MS_WINDOWS
- #define WIN32_WINNT 0x400
- #define _WIN32_WINNT 0x400
- #define WIN32_LEAN_AND_MEAN
- #include <windows.h>
- #include <wincrypt.h>
- #endif
- #include <string.h>
- #include <openssl/err.h>
- #include <openssl/rsa.h>
- #include <openssl/pem.h>
- #include <openssl/evp.h>
- #include <openssl/rand.h>
- #include <openssl/opensslv.h>
- #include <openssl/bn.h>
- #include <openssl/dh.h>
- #include <openssl/rsa.h>
- #include <openssl/dh.h>
- #include <stdlib.h>
- #include <assert.h>
- #include <stdio.h>
- #include <limits.h>
- #ifdef HAVE_CTYPE_H
- #include <ctype.h>
- #endif
- #ifdef HAVE_UNISTD_H
- #include <unistd.h>
- #endif
- #ifdef HAVE_FCNTL_H
- #include <fcntl.h>
- #endif
- #ifdef HAVE_SYS_FCNTL_H
- #include <sys/fcntl.h>
- #endif
- #include "crypto.h"
- #include "log.h"
- #include "aes.h"
- #include "util.h"
- #if OPENSSL_VERSION_NUMBER < 0x00905000l
- #error "We require openssl >= 0.9.5"
- #elif OPENSSL_VERSION_NUMBER < 0x00906000l
- #define OPENSSL_095
- #endif
- /*
- * Certain functions that return a success code in OpenSSL 0.9.6 return void
- * (and don't indicate errors) in OpenSSL version 0.9.5.
- *
- * [OpenSSL 0.9.5 matters, because it ships with Redhat 6.2.]
- */
- #ifdef OPENSSL_095
- #define RETURN_SSL_OUTCOME(exp) (exp); return 0
- #else
- #define RETURN_SSL_OUTCOME(exp) return !(exp)
- #endif
- #define PUBLIC_KEY_OK(k) ((k) && (k)->key && (k)->key->n)
- #define PRIVATE_KEY_OK(k) ((k) && (k)->key && (k)->key->p)
- struct crypto_pk_env_t
- {
- int refs; /* reference counting; so we don't have to copy keys */
- RSA *key;
- };
- struct crypto_cipher_env_t
- {
- unsigned char key[CIPHER_KEY_LEN];
- unsigned char iv[CIPHER_IV_LEN+1];
- /* +1 because some compilers don't like a length of 0 */
- aes_cnt_cipher_t *cipher;
- };
- struct crypto_dh_env_t {
- DH *dh;
- };
- static INLINE int
- crypto_get_rsa_padding_overhead(int padding) {
- switch(padding)
- {
- case RSA_NO_PADDING: return 0;
- case RSA_PKCS1_OAEP_PADDING: return 42;
- case RSA_PKCS1_PADDING: return 11;
- default: tor_assert(0); return -1;
- }
- }
- static INLINE int
- crypto_get_rsa_padding(int padding) {
- switch(padding)
- {
- case PK_NO_PADDING: return RSA_NO_PADDING;
- case PK_PKCS1_PADDING: return RSA_PKCS1_PADDING;
- case PK_PKCS1_OAEP_PADDING: return RSA_PKCS1_OAEP_PADDING;
- default: tor_assert(0); return -1;
- }
- }
- static int _crypto_global_initialized = 0;
- /* errors */
- static void
- crypto_log_errors(int severity, const char *doing)
- {
- int err;
- const char *msg, *lib, *func;
- while ((err = ERR_get_error()) != 0) {
- msg = (const char*)ERR_reason_error_string(err);
- lib = (const char*)ERR_lib_error_string(err);
- func = (const char*)ERR_func_error_string(err);
- if (!msg) msg = "(null)";
- if (doing) {
- log(severity, "crypto error while %s: %s (in %s:%s)", doing, msg, lib,func);
- } else {
- log(severity, "crypto error: %s (in %s:%s)", msg, lib, func);
- }
- }
- }
- int crypto_global_init()
- {
- if (!_crypto_global_initialized) {
- ERR_load_crypto_strings();
- _crypto_global_initialized = 1;
- }
- return 0;
- }
- int crypto_global_cleanup()
- {
- ERR_free_strings();
- return 0;
- }
- /* used by tortls.c */
- crypto_pk_env_t *_crypto_new_pk_env_rsa(RSA *rsa)
- {
- crypto_pk_env_t *env;
- tor_assert(rsa);
- env = tor_malloc(sizeof(crypto_pk_env_t));
- env->refs = 1;
- env->key = rsa;
- return env;
- }
- /* used by tortls.c */
- RSA *_crypto_pk_env_get_rsa(crypto_pk_env_t *env)
- {
- return env->key;
- }
- /* used by tortls.c */
- EVP_PKEY *_crypto_pk_env_get_evp_pkey(crypto_pk_env_t *env, int private)
- {
- RSA *key = NULL;
- EVP_PKEY *pkey = NULL;
- tor_assert(env->key);
- if (private) {
- if (!(key = RSAPrivateKey_dup(env->key)))
- goto error;
- } else {
- if (!(key = RSAPublicKey_dup(env->key)))
- goto error;
- }
- if (!(pkey = EVP_PKEY_new()))
- goto error;
- if (!(EVP_PKEY_assign_RSA(pkey, key)))
- goto error;
- return pkey;
- error:
- if (pkey)
- EVP_PKEY_free(pkey);
- if (key)
- RSA_free(key);
- return NULL;
- }
- DH *_crypto_dh_env_get_dh(crypto_dh_env_t *dh)
- {
- return dh->dh;
- }
- crypto_pk_env_t *crypto_new_pk_env(void)
- {
- RSA *rsa;
- rsa = RSA_new();
- if (!rsa) return NULL;
- return _crypto_new_pk_env_rsa(rsa);
- }
- void crypto_free_pk_env(crypto_pk_env_t *env)
- {
- tor_assert(env);
- if(--env->refs > 0)
- return;
- if (env->key)
- RSA_free(env->key);
- free(env);
- }
- /* Create a new crypto_cipher_env_t for a given onion cipher type, key,
- * iv, and encryption flag (1=encrypt, 0=decrypt). Return the crypto object
- * on success; NULL on failure.
- */
- crypto_cipher_env_t *
- crypto_create_init_cipher(const char *key, const char *iv, int encrypt_mode)
- {
- int r;
- crypto_cipher_env_t *crypto = NULL;
- if (! (crypto = crypto_new_cipher_env())) {
- log_fn(LOG_WARN, "Unable to allocate crypto object");
- return NULL;
- }
- if (crypto_cipher_set_key(crypto, key)) {
- crypto_log_errors(LOG_WARN, "setting symmetric key");
- goto error;
- }
- if (crypto_cipher_set_iv(crypto, iv)) {
- crypto_log_errors(LOG_WARN, "setting IV");
- goto error;
- }
- if (encrypt_mode)
- r = crypto_cipher_encrypt_init_cipher(crypto);
- else
- r = crypto_cipher_decrypt_init_cipher(crypto);
- if (r)
- goto error;
- return crypto;
- error:
- if (crypto)
- crypto_free_cipher_env(crypto);
- return NULL;
- }
- crypto_cipher_env_t *crypto_new_cipher_env()
- {
- crypto_cipher_env_t *env;
- env = tor_malloc_zero(sizeof(crypto_cipher_env_t));
- env->cipher = aes_new_cipher();
- return env;
- }
- void crypto_free_cipher_env(crypto_cipher_env_t *env)
- {
- tor_assert(env);
- tor_assert(env->cipher);
- aes_free_cipher(env->cipher);
- tor_free(env);
- }
- /* public key crypto */
- int crypto_pk_generate_key(crypto_pk_env_t *env)
- {
- tor_assert(env);
- if (env->key)
- RSA_free(env->key);
- env->key = RSA_generate_key(PK_BITS,65537, NULL, NULL);
- if (!env->key) {
- crypto_log_errors(LOG_WARN, "generating RSA key");
- return -1;
- }
- return 0;
- }
- static int crypto_pk_read_private_key_from_file(crypto_pk_env_t *env,
- FILE *src)
- {
- tor_assert(env && src);
- if (env->key)
- RSA_free(env->key);
- env->key = PEM_read_RSAPrivateKey(src, NULL, NULL, NULL);
- if (!env->key) {
- crypto_log_errors(LOG_WARN, "reading private key from file");
- return -1;
- }
- return 0;
- }
- int crypto_pk_read_private_key_from_filename(crypto_pk_env_t *env, const char *keyfile)
- {
- FILE *f_pr;
- tor_assert(env && keyfile);
- if(strspn(keyfile,CONFIG_LEGAL_FILENAME_CHARACTERS) != strlen(keyfile)) {
- /* filename contains nonlegal characters */
- return -1;
- }
- /* open the keyfile */
- f_pr=fopen(keyfile,"rb");
- if (!f_pr)
- return -1;
- /* read the private key */
- if(crypto_pk_read_private_key_from_file(env, f_pr) < 0) {
- fclose(f_pr);
- return -1;
- }
- fclose(f_pr);
- /* check the private key */
- if (crypto_pk_check_key(env) <= 0)
- return -1;
- return 0;
- }
- int crypto_pk_write_public_key_to_string(crypto_pk_env_t *env, char **dest, int *len) {
- BUF_MEM *buf;
- BIO *b;
- tor_assert(env && env->key && dest);
- b = BIO_new(BIO_s_mem()); /* Create a memory BIO */
- /* Now you can treat b as if it were a file. Just use the
- * PEM_*_bio_* functions instead of the non-bio variants.
- */
- if(!PEM_write_bio_RSAPublicKey(b, env->key)) {
- crypto_log_errors(LOG_WARN, "writing public key to string");
- return -1;
- }
- BIO_get_mem_ptr(b, &buf);
- BIO_set_close(b, BIO_NOCLOSE); /* so BIO_free doesn't free buf */
- BIO_free(b);
- *dest = tor_malloc(buf->length+1);
- memcpy(*dest, buf->data, buf->length);
- (*dest)[buf->length] = 0; /* null terminate it */
- *len = buf->length;
- BUF_MEM_free(buf);
- return 0;
- }
- int crypto_pk_read_public_key_from_string(crypto_pk_env_t *env, const char *src, int len) {
- BIO *b;
- tor_assert(env && src);
- b = BIO_new(BIO_s_mem()); /* Create a memory BIO */
- BIO_write(b, src, len);
- if (env->key)
- RSA_free(env->key);
- env->key = PEM_read_bio_RSAPublicKey(b, NULL, NULL, NULL);
- BIO_free(b);
- if(!env->key) {
- crypto_log_errors(LOG_WARN, "reading public key from string");
- return -1;
- }
- return 0;
- }
- int
- crypto_pk_write_private_key_to_filename(crypto_pk_env_t *env,
- const char *fname)
- {
- BIO *bio;
- char *cp;
- long len;
- char *s;
- int r;
- tor_assert(PRIVATE_KEY_OK(env));
- if (!(bio = BIO_new(BIO_s_mem())))
- return -1;
- if (PEM_write_bio_RSAPrivateKey(bio, env->key, NULL,NULL,0,NULL,NULL)
- == 0) {
- crypto_log_errors(LOG_WARN, "writing private key");
- BIO_free(bio);
- return -1;
- }
- len = BIO_get_mem_data(bio, &cp);
- s = tor_malloc(len+1);
- strncpy(s, cp, len);
- s[len] = '\0';
- r = write_str_to_file(fname, s);
- BIO_free(bio);
- free(s);
- return r;
- }
- int crypto_pk_check_key(crypto_pk_env_t *env)
- {
- int r;
- tor_assert(env);
- r = RSA_check_key(env->key);
- if (r <= 0)
- crypto_log_errors(LOG_WARN,"checking RSA key");
- return r;
- }
- int crypto_pk_cmp_keys(crypto_pk_env_t *a, crypto_pk_env_t *b) {
- int result;
- if (!a || !b)
- return -1;
- if (!a->key || !b->key)
- return -1;
- tor_assert(PUBLIC_KEY_OK(a));
- tor_assert(PUBLIC_KEY_OK(b));
- result = BN_cmp((a->key)->n, (b->key)->n);
- if (result)
- return result;
- return BN_cmp((a->key)->e, (b->key)->e);
- }
- /* return the size of the public key modulus in 'env', in bytes. */
- int crypto_pk_keysize(crypto_pk_env_t *env)
- {
- tor_assert(env && env->key);
- return RSA_size(env->key);
- }
- crypto_pk_env_t *crypto_pk_dup_key(crypto_pk_env_t *env) {
- tor_assert(env && env->key);
- env->refs++;
- return env;
- }
- int crypto_pk_public_encrypt(crypto_pk_env_t *env, const unsigned char *from, int fromlen, unsigned char *to, int padding)
- {
- int r;
- tor_assert(env && from && to);
- r = RSA_public_encrypt(fromlen, (unsigned char*)from, to, env->key,
- crypto_get_rsa_padding(padding));
- if (r<0)
- crypto_log_errors(LOG_WARN, "performing RSA encryption");
- return r;
- }
- int crypto_pk_private_decrypt(crypto_pk_env_t *env, const unsigned char *from, int fromlen, unsigned char *to, int padding)
- {
- int r;
- tor_assert(env && from && to && env->key);
- if (!env->key->p)
- /* Not a private key */
- return -1;
- r = RSA_private_decrypt(fromlen, (unsigned char*)from, to, env->key,
- crypto_get_rsa_padding(padding));
- if (r<0)
- crypto_log_errors(LOG_WARN, "performing RSA decryption");
- return r;
- }
- int crypto_pk_public_checksig(crypto_pk_env_t *env, const unsigned char *from, int fromlen, unsigned char *to)
- {
- int r;
- tor_assert(env && from && to);
- r = RSA_public_decrypt(fromlen, (unsigned char*)from, to, env->key, RSA_PKCS1_PADDING);
- if (r<0)
- crypto_log_errors(LOG_WARN, "checking RSA signature");
- return r;
- }
- int crypto_pk_private_sign(crypto_pk_env_t *env, const unsigned char *from, int fromlen, unsigned char *to)
- {
- int r;
- tor_assert(env && from && to);
- if (!env->key->p)
- /* Not a private key */
- return -1;
- r = RSA_private_encrypt(fromlen, (unsigned char*)from, to, env->key, RSA_PKCS1_PADDING);
- if (r<0)
- crypto_log_errors(LOG_WARN, "generating RSA signature");
- return r;
- }
- /* Return 0 if sig is a correct signature for SHA1(data). Else return -1.
- */
- int crypto_pk_public_checksig_digest(crypto_pk_env_t *env, const unsigned char *data, int datalen, const unsigned char *sig, int siglen)
- {
- char digest[DIGEST_LEN];
- char buf[PK_BYTES+1];
- int r;
- tor_assert(env && data && sig);
- if (crypto_digest(data,datalen,digest)<0) {
- log_fn(LOG_WARN, "couldn't compute digest");
- return -1;
- }
- r = crypto_pk_public_checksig(env,sig,siglen,buf);
- if (r != DIGEST_LEN) {
- log_fn(LOG_WARN, "Invalid signature");
- return -1;
- }
- if (memcmp(buf, digest, DIGEST_LEN)) {
- log_fn(LOG_WARN, "Signature mismatched with digest.");
- return -1;
- }
- return 0;
- }
- /* Fill 'to' with a signature of SHA1(from).
- */
- int crypto_pk_private_sign_digest(crypto_pk_env_t *env, const unsigned char *from, int fromlen, unsigned char *to)
- {
- char digest[DIGEST_LEN];
- if (crypto_digest(from,fromlen,digest)<0)
- return 0;
- return crypto_pk_private_sign(env,digest,DIGEST_LEN,to);
- }
- /* Perform a hybrid (public/secret) encryption on 'fromlen' bytes of data
- * from 'from', with padding type 'padding', storing the results on 'to'.
- *
- * If no padding is used, the public key must be at least as large as
- * 'from'.
- *
- * Returns the number of bytes written on success, -1 on failure.
- *
- * The encrypted data consists of:
- *
- * The source data, padded and encrypted with the public key, if the
- * padded source data is no longer than the public key, and "force"
- * is false.
- * OR
- * The beginning of the source data prefixed with a 16-byte symmetric key,
- * padded and encrypted with the public key; followed by the rest of
- * the source data encrypted in AES-CTR mode with the symmetric key.
- *
- */
- int crypto_pk_public_hybrid_encrypt(crypto_pk_env_t *env,
- const unsigned char *from,
- int fromlen, unsigned char *to,
- int padding, int force)
- {
- int overhead, pkeylen, outlen, r, symlen;
- crypto_cipher_env_t *cipher = NULL;
- char buf[PK_BYTES+1];
- tor_assert(env && from && to);
- overhead = crypto_get_rsa_padding_overhead(crypto_get_rsa_padding(padding));
- pkeylen = crypto_pk_keysize(env);
- if (padding == PK_NO_PADDING && fromlen < pkeylen)
- return -1;
- if (!force && fromlen+overhead <= pkeylen) {
- /* It all fits in a single encrypt. */
- return crypto_pk_public_encrypt(env,from,fromlen,to,padding);
- }
- cipher = crypto_new_cipher_env();
- if (!cipher) return -1;
- if (crypto_cipher_generate_key(cipher)<0)
- goto err;
- /* You can't just run around RSA-encrypting any bitstream: if it's
- * greater than the RSA key, then OpenSSL will happily encrypt, and
- * later decrypt to the wrong value. So we set the first bit of
- * 'cipher->key' to 0 if we aren't padding. This means that our
- * symmetric key is really only 127 bits.
- */
- if (padding == PK_NO_PADDING)
- cipher->key[0] &= 0x7f;
- if (crypto_cipher_encrypt_init_cipher(cipher)<0)
- goto err;
- memcpy(buf, cipher->key, CIPHER_KEY_LEN);
- memcpy(buf+CIPHER_KEY_LEN, from, pkeylen-overhead-CIPHER_KEY_LEN);
- /* Length of symmetrically encrypted data. */
- symlen = fromlen-(pkeylen-overhead-CIPHER_KEY_LEN);
- outlen = crypto_pk_public_encrypt(env,buf,pkeylen-overhead,to,padding);
- if (outlen!=pkeylen) {
- goto err;
- }
- r = crypto_cipher_encrypt(cipher,
- from+pkeylen-overhead-CIPHER_KEY_LEN, symlen,
- to+outlen);
- if (r<0) goto err;
- memset(buf, 0, sizeof(buf));
- crypto_free_cipher_env(cipher);
- return outlen + symlen;
- err:
- memset(buf, 0, sizeof(buf));
- if (cipher) crypto_free_cipher_env(cipher);
- return -1;
- }
- /* Invert crypto_pk_public_hybrid_encrypt. */
- int crypto_pk_private_hybrid_decrypt(crypto_pk_env_t *env,
- const unsigned char *from,
- int fromlen, unsigned char *to,
- int padding)
- {
- int overhead, pkeylen, outlen, r;
- crypto_cipher_env_t *cipher = NULL;
- char buf[PK_BYTES+1];
- overhead = crypto_get_rsa_padding_overhead(crypto_get_rsa_padding(padding));
- pkeylen = crypto_pk_keysize(env);
- if (fromlen <= pkeylen) {
- return crypto_pk_private_decrypt(env,from,fromlen,to,padding);
- }
- outlen = crypto_pk_private_decrypt(env,from,pkeylen,buf,padding);
- if (outlen<0) {
- /* this is only log-levelinfo, because when we're decrypting
- * onions, we try several keys to see which will work */
- log_fn(LOG_INFO, "Error decrypting public-key data");
- return -1;
- }
- if (outlen < CIPHER_KEY_LEN) {
- log_fn(LOG_WARN, "No room for a symmetric key");
- return -1;
- }
- cipher = crypto_create_init_cipher(buf, NULL, 0);
- if (!cipher) {
- return -1;
- }
- memcpy(to,buf+CIPHER_KEY_LEN,outlen-CIPHER_KEY_LEN);
- outlen -= CIPHER_KEY_LEN;
- r = crypto_cipher_decrypt(cipher, from+pkeylen, fromlen-pkeylen,
- to+outlen);
- if (r<0)
- goto err;
- memset(buf,0,sizeof(buf));
- crypto_free_cipher_env(cipher);
- return outlen + (fromlen-pkeylen);
- err:
- memset(buf,0,sizeof(buf));
- if (cipher) crypto_free_cipher_env(cipher);
- return -1;
- }
- /* Encode the public portion of 'pk' into 'dest'. Return -1 on error,
- * or the number of characters used on success.
- */
- int crypto_pk_asn1_encode(crypto_pk_env_t *pk, char *dest, int dest_len)
- {
- int len;
- unsigned char *buf, *cp;
- len = i2d_RSAPublicKey(pk->key, NULL);
- if (len < 0 || len > dest_len)
- return -1;
- cp = buf = tor_malloc(len+1);
- len = i2d_RSAPublicKey(pk->key, &cp);
- if (len < 0) {
- crypto_log_errors(LOG_WARN,"encoding public key");
- tor_free(buf);
- return -1;
- }
- /* We don't encode directly into 'dest', because that would be illegal
- * type-punning. (C99 is smarter than me, C99 is smarter than me...)
- */
- memcpy(dest,buf,len);
- tor_free(buf);
- return len;
- }
- /* Decode an ASN1-encoded public key from str.
- */
- crypto_pk_env_t *crypto_pk_asn1_decode(const char *str, int len)
- {
- RSA *rsa;
- unsigned char *buf;
- /* This ifdef suppresses a type warning. Take out the first case once
- * everybody is using openssl 0.9.7 or later.
- */
- #if OPENSSL_VERSION_NUMBER < 0x00907000l
- unsigned char *cp;
- #else
- const unsigned char *cp;
- #endif
- cp = buf = tor_malloc(len);
- memcpy(buf,str,len);
- rsa = d2i_RSAPublicKey(NULL, &cp, len);
- tor_free(buf);
- if (!rsa) {
- crypto_log_errors(LOG_WARN,"decoding public key");
- return NULL;
- }
- return _crypto_new_pk_env_rsa(rsa);
- }
- /* Given a private or public key pk, put a SHA1 hash of the public key into
- * digest_out (must have DIGEST_LEN bytes of space).
- */
- int crypto_pk_get_digest(crypto_pk_env_t *pk, char *digest_out)
- {
- unsigned char *buf, *bufp;
- int len;
- len = i2d_RSAPublicKey(pk->key, NULL);
- if (len < 0)
- return -1;
- buf = bufp = tor_malloc(len+1);
- len = i2d_RSAPublicKey(pk->key, &bufp);
- if (len < 0) {
- crypto_log_errors(LOG_WARN,"encoding public key");
- free(buf);
- return -1;
- }
- if (crypto_digest(buf, len, digest_out) < 0) {
- free(buf);
- return -1;
- }
- free(buf);
- return 0;
- }
- /* Given a private or public key pk, put a fingerprint of the
- * public key into fp_out (must have at least FINGERPRINT_LEN+1 bytes of
- * space).
- */
- int
- crypto_pk_get_fingerprint(crypto_pk_env_t *pk, char *fp_out)
- {
- unsigned char *bufp;
- unsigned char digest[DIGEST_LEN];
- unsigned char buf[FINGERPRINT_LEN+1];
- int i;
- if (crypto_pk_get_digest(pk, digest)) {
- return -1;
- }
- bufp = buf;
- for (i = 0; i < DIGEST_LEN; ++i) {
- sprintf(bufp,"%02X",digest[i]);
- bufp += 2;
- if (i%2 && i != 19) {
- *bufp++ = ' ';
- }
- }
- *bufp = '\0';
- tor_assert(strlen(buf) == FINGERPRINT_LEN);
- tor_assert(crypto_pk_check_fingerprint_syntax(buf));
- strcpy(fp_out, buf);
- return 0;
- }
- int
- crypto_pk_check_fingerprint_syntax(const char *s)
- {
- int i;
- for (i = 0; i < FINGERPRINT_LEN; ++i) {
- if ((i%5) == 4) {
- if (!isspace((int)s[i])) return 0;
- } else {
- if (!isxdigit((int)s[i])) return 0;
- }
- }
- if (s[FINGERPRINT_LEN]) return 0;
- return 1;
- }
- /* symmetric crypto */
- int crypto_cipher_generate_key(crypto_cipher_env_t *env)
- {
- tor_assert(env);
- return crypto_rand(CIPHER_KEY_LEN, env->key);
- }
- int crypto_cipher_set_iv(crypto_cipher_env_t *env, const unsigned char *iv)
- {
- tor_assert(env && (CIPHER_IV_LEN==0 || iv));
- if (!CIPHER_IV_LEN)
- return 0;
- if (!env->iv)
- return -1;
- memcpy(env->iv, iv, CIPHER_IV_LEN);
- return 0;
- }
- int crypto_cipher_set_key(crypto_cipher_env_t *env, const unsigned char *key)
- {
- tor_assert(env && key);
- if (!env->key)
- return -1;
- memcpy(env->key, key, CIPHER_KEY_LEN);
- return 0;
- }
- const unsigned char *crypto_cipher_get_key(crypto_cipher_env_t *env)
- {
- return env->key;
- }
- int crypto_cipher_encrypt_init_cipher(crypto_cipher_env_t *env)
- {
- tor_assert(env);
- aes_set_key(env->cipher, env->key, CIPHER_KEY_LEN*8);
- return 0;
- }
- int crypto_cipher_decrypt_init_cipher(crypto_cipher_env_t *env)
- {
- tor_assert(env);
- aes_set_key(env->cipher, env->key, CIPHER_KEY_LEN*8);
- return 0;
- }
- int crypto_cipher_encrypt(crypto_cipher_env_t *env, const unsigned char *from, unsigned int fromlen, unsigned char *to)
- {
- tor_assert(env && env->cipher && from && fromlen && to);
- aes_crypt(env->cipher, from, fromlen, to);
- return 0;
- }
- int crypto_cipher_decrypt(crypto_cipher_env_t *env, const unsigned char *from, unsigned int fromlen, unsigned char *to)
- {
- tor_assert(env && from && to);
- aes_crypt(env->cipher, from, fromlen, to);
- return 0;
- }
- int
- crypto_cipher_rewind(crypto_cipher_env_t *env, long delta)
- {
- return crypto_cipher_advance(env, -delta);
- }
- int
- crypto_cipher_advance(crypto_cipher_env_t *env, long delta)
- {
- aes_adjust_counter(env->cipher, delta);
- return 0;
- }
- /* SHA-1 */
- int crypto_digest(const unsigned char *m, int len, unsigned char *digest)
- {
- tor_assert(m && digest);
- return (SHA1(m,len,digest) == NULL);
- }
- struct crypto_digest_env_t {
- SHA_CTX d;
- };
- crypto_digest_env_t *
- crypto_new_digest_env(void)
- {
- crypto_digest_env_t *r;
- r = tor_malloc(sizeof(crypto_digest_env_t));
- SHA1_Init(&r->d);
- return r;
- }
- void
- crypto_free_digest_env(crypto_digest_env_t *digest) {
- tor_free(digest);
- }
- void
- crypto_digest_add_bytes(crypto_digest_env_t *digest, const char *data,
- size_t len)
- {
- tor_assert(digest);
- tor_assert(data);
- SHA1_Update(&digest->d, (void*)data, len);
- }
- void crypto_digest_get_digest(crypto_digest_env_t *digest,
- char *out, size_t out_len)
- {
- static char r[DIGEST_LEN];
- tor_assert(digest && out);
- tor_assert(out_len <= DIGEST_LEN);
- SHA1_Final(r, &digest->d);
- memcpy(out, r, out_len);
- }
- crypto_digest_env_t *
- crypto_digest_dup(const crypto_digest_env_t *digest)
- {
- crypto_digest_env_t *r;
- tor_assert(digest);
- r = tor_malloc(sizeof(crypto_digest_env_t));
- memcpy(r,digest,sizeof(crypto_digest_env_t));
- return r;
- }
- void
- crypto_digest_assign(crypto_digest_env_t *into,
- const crypto_digest_env_t *from)
- {
- tor_assert(into && from);
- memcpy(into,from,sizeof(crypto_digest_env_t));
- }
- /* DH */
- static BIGNUM *dh_param_p = NULL;
- static BIGNUM *dh_param_g = NULL;
- static void init_dh_param() {
- BIGNUM *p, *g;
- int r;
- if (dh_param_p && dh_param_g)
- return;
- p = BN_new();
- g = BN_new();
- tor_assert(p && g);
- #if 0
- /* This is from draft-ietf-ipsec-ike-modp-groups-05.txt. It's a safe
- prime, and supposedly it equals:
- 2^1536 - 2^1472 - 1 + 2^64 * { [2^1406 pi] + 741804 }
- */
- r = BN_hex2bn(&p,
- "FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD1"
- "29024E088A67CC74020BBEA63B139B22514A08798E3404DD"
- "EF9519B3CD3A431B302B0A6DF25F14374FE1356D6D51C245"
- "E485B576625E7EC6F44C42E9A637ED6B0BFF5CB6F406B7ED"
- "EE386BFB5A899FA5AE9F24117C4B1FE649286651ECE45B3D"
- "C2007CB8A163BF0598DA48361C55D39A69163FA8FD24CF5F"
- "83655D23DCA3AD961C62F356208552BB9ED529077096966D"
- "670C354E4ABC9804F1746C08CA237327FFFFFFFFFFFFFFFF");
- #endif
- /* This is from rfc2409, section 6.2. It's a safe prime, and
- supposedly it equals:
- 2^1024 - 2^960 - 1 + 2^64 * { [2^894 pi] + 129093 }.
- */
- /* See also rfc 3536 */
- r = BN_hex2bn(&p,
- "FFFFFFFFFFFFFFFFC90FDAA22168C234C4C6628B80DC1CD129024E08"
- "8A67CC74020BBEA63B139B22514A08798E3404DDEF9519B3CD3A431B"
- "302B0A6DF25F14374FE1356D6D51C245E485B576625E7EC6F44C42E9"
- "A637ED6B0BFF5CB6F406B7EDEE386BFB5A899FA5AE9F24117C4B1FE6"
- "49286651ECE65381FFFFFFFFFFFFFFFF");
- tor_assert(r);
- r = BN_set_word(g, 2);
- tor_assert(r);
- dh_param_p = p;
- dh_param_g = g;
- }
- crypto_dh_env_t *crypto_dh_new()
- {
- crypto_dh_env_t *res = NULL;
- if (!dh_param_p)
- init_dh_param();
- res = tor_malloc(sizeof(crypto_dh_env_t));
- res->dh = NULL;
- if (!(res->dh = DH_new()))
- goto err;
- if (!(res->dh->p = BN_dup(dh_param_p)))
- goto err;
- if (!(res->dh->g = BN_dup(dh_param_g)))
- goto err;
- return res;
- err:
- crypto_log_errors(LOG_WARN, "creating DH object");
- if (res && res->dh) DH_free(res->dh); /* frees p and g too */
- if (res) free(res);
- return NULL;
- }
- int crypto_dh_get_bytes(crypto_dh_env_t *dh)
- {
- tor_assert(dh);
- return DH_size(dh->dh);
- }
- int crypto_dh_generate_public(crypto_dh_env_t *dh)
- {
- if (!DH_generate_key(dh->dh)) {
- crypto_log_errors(LOG_WARN, "generating DH key");
- return -1;
- }
- return 0;
- }
- int crypto_dh_get_public(crypto_dh_env_t *dh, char *pubkey, int pubkey_len)
- {
- int bytes;
- tor_assert(dh);
- if (!dh->dh->pub_key) {
- if (crypto_dh_generate_public(dh)<0)
- return -1;
- }
- tor_assert(dh->dh->pub_key);
- bytes = BN_num_bytes(dh->dh->pub_key);
- if (pubkey_len < bytes)
- return -1;
- memset(pubkey, 0, pubkey_len);
- BN_bn2bin(dh->dh->pub_key, pubkey+(pubkey_len-bytes));
- return 0;
- }
- #undef MIN
- #define MIN(a,b) ((a)<(b)?(a):(b))
- int crypto_dh_compute_secret(crypto_dh_env_t *dh,
- const char *pubkey, int pubkey_len,
- char *secret_out, int secret_bytes_out)
- {
- unsigned char hash[DIGEST_LEN];
- unsigned char *secret_tmp = NULL;
- BIGNUM *pubkey_bn = NULL;
- int secret_len;
- int i;
- tor_assert(dh);
- tor_assert(secret_bytes_out/DIGEST_LEN <= 255);
- if (!(pubkey_bn = BN_bin2bn(pubkey, pubkey_len, NULL)))
- goto error;
- secret_tmp = tor_malloc(crypto_dh_get_bytes(dh)+1);
- secret_len = DH_compute_key(secret_tmp, pubkey_bn, dh->dh);
- /* sometimes secret_len might be less than 128, e.g., 127. that's ok. */
- for (i = 0; i < secret_bytes_out; i += DIGEST_LEN) {
- secret_tmp[secret_len] = (unsigned char) i/DIGEST_LEN;
- if (crypto_digest(secret_tmp, secret_len+1, hash))
- goto error;
- memcpy(secret_out+i, hash, MIN(DIGEST_LEN, secret_bytes_out-i));
- }
- secret_len = secret_bytes_out;
- goto done;
- error:
- secret_len = -1;
- done:
- crypto_log_errors(LOG_WARN, "completing DH handshake");
- if (pubkey_bn)
- BN_free(pubkey_bn);
- tor_free(secret_tmp);
- return secret_len;
- }
- void crypto_dh_free(crypto_dh_env_t *dh)
- {
- tor_assert(dh && dh->dh);
- DH_free(dh->dh);
- free(dh);
- }
- /* random numbers */
- #ifdef MS_WINDOWS
- int crypto_seed_rng()
- {
- static int provider_set = 0;
- static HCRYPTPROV provider;
- char buf[DIGEST_LEN+1];
- if (!provider_set) {
- if (!CryptAcquireContext(&provider, NULL, NULL, PROV_RSA_FULL, 0)) {
- if (GetLastError() != NTE_BAD_KEYSET) {
- log_fn(LOG_ERR,"Can't get CryptoAPI provider [1]");
- return -1;
- }
- /* Yes, we need to try it twice. */
- if (!CryptAcquireContext(&provider, NULL, NULL, PROV_RSA_FULL,
- CRYPT_NEWKEYSET)) {
- log_fn(LOG_ERR,"Can't get CryptoAPI provider [2]");
- return -1;
- }
- }
- provider_set = 1;
- }
- if (!CryptGenRandom(provider, DIGEST_LEN, buf)) {
- log_fn(LOG_ERR,"Can't get entropy from CryptoAPI.");
- return -1;
- }
- RAND_seed(buf, DIGEST_LEN);
- /* And add the current screen state to the entopy pool for
- * good measure. */
- RAND_screen();
- return 0;
- }
- #else
- int crypto_seed_rng()
- {
- static char *filenames[] = {
- "/dev/srandom", "/dev/urandom", "/dev/random", NULL
- };
- int fd;
- int i, n;
- char buf[DIGEST_LEN+1];
- for (i = 0; filenames[i]; ++i) {
- fd = open(filenames[i], O_RDONLY, 0);
- if (fd<0) continue;
- log_fn(LOG_INFO, "Seeding RNG from %s", filenames[i]);
- n = read(fd, buf, DIGEST_LEN);
- close(fd);
- if (n != DIGEST_LEN) {
- log_fn(LOG_WARN, "Error reading from entropy source");
- return -1;
- }
- RAND_seed(buf, DIGEST_LEN);
- return 0;
- }
- log_fn(LOG_WARN, "Cannot seed RNG -- no entropy source found.");
- return -1;
- }
- #endif
- int crypto_rand(unsigned int n, unsigned char *to)
- {
- int r;
- tor_assert(to);
- r = RAND_bytes(to, n);
- if (r == 0)
- crypto_log_errors(LOG_WARN, "generating random data");
- return (r != 1);
- }
- void crypto_pseudo_rand(unsigned int n, unsigned char *to)
- {
- tor_assert(to);
- if (RAND_pseudo_bytes(to, n) == -1) {
- log_fn(LOG_ERR, "RAND_pseudo_bytes failed unexpectedly.");
- crypto_log_errors(LOG_WARN, "generating random data");
- exit(1);
- }
- }
- /* return a pseudo random number between 0 and max-1 */
- int crypto_pseudo_rand_int(unsigned int max) {
- unsigned int val;
- unsigned int cutoff;
- tor_assert(max < UINT_MAX);
- tor_assert(max > 0); /* don't div by 0 */
- /* We ignore any values that are >= 'cutoff,' to avoid biasing the
- * distribution with clipping at the upper end of unsigned int's
- * range.
- */
- cutoff = UINT_MAX - (UINT_MAX%max);
- while(1) {
- crypto_pseudo_rand(sizeof(val), (unsigned char*) &val);
- if (val < cutoff)
- return val % max;
- }
- }
- int
- base64_encode(char *dest, int destlen, const char *src, int srclen)
- {
- EVP_ENCODE_CTX ctx;
- int len, ret;
- /* 48 bytes of input -> 64 bytes of output plus newline.
- Plus one more byte, in case I'm wrong.
- */
- if (destlen < ((srclen/48)+1)*66)
- return -1;
- EVP_EncodeInit(&ctx);
- EVP_EncodeUpdate(&ctx, dest, &len, (char*) src, srclen);
- EVP_EncodeFinal(&ctx, dest+len, &ret);
- ret += len;
- return ret;
- }
- int
- base64_decode(char *dest, int destlen, const char *src, int srclen)
- {
- EVP_ENCODE_CTX ctx;
- int len, ret;
- /* 64 bytes of input -> *up to* 48 bytes of output.
- Plus one more byte, in caes I'm wrong.
- */
- if (destlen < ((srclen/64)+1)*49)
- return -1;
- EVP_DecodeInit(&ctx);
- EVP_DecodeUpdate(&ctx, dest, &len, (char*) src, srclen);
- EVP_DecodeFinal(&ctx, dest, &ret);
- ret += len;
- return ret;
- }
- /* Implement base32 encoding as in rfc3548. Limitation: Requires that
- * srclen is a multiple of 5.
- */
- int
- base32_encode(char *dest, int destlen, const char *src, int srclen)
- {
- int nbits, i, bit, v, u;
- nbits = srclen * 8;
- if ((nbits%5) != 0)
- /* We need an even multiple of 5 bits. */
- return -1;
- if ((nbits/5)+1 > destlen)
- /* Not enough space. */
- return -1;
- for (i=0,bit=0; bit < nbits; ++i, bit+=5) {
- /* set v to the 16-bit value starting at src[bits/8], 0-padded. */
- v = ((uint8_t)src[bit/8]) << 8;
- if (bit+5<nbits) v += (uint8_t)src[(bit/8)+1];
- /* set u to the 5-bit value at the bit'th bit of src. */
- u = (v >> (11-(bit%8))) & 0x1F;
- dest[i] = BASE32_CHARS[u];
- }
- dest[i] = '\0';
- return 0;
- }
- /*
- Local Variables:
- mode:c
- indent-tabs-mode:nil
- c-basic-offset:2
- End:
- */
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