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Tweaks into functions and variables in crypto_rsa.[ch]

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crypto_get_rsa_padding_overhead() and crypto_get_rsa_padding() are
not static inline anymore in order to split the crypto_rsa module
from crypto.[ch].

Also included necessary modules in order to solve dependency issues.

Also made two functions in crypto.c use crypto_pk_asn1_encdoe()
instead of reaching into the crypto_pk_t struct.
This commit is contained in:
Fernando Fernandez Mancera 2018-01-26 16:43:46 +01:00 committed by Nick Mathewson
parent 54783b4c22
commit 3812319bb1
3 changed files with 88 additions and 26 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

53
src/common/crypto.c
View File

@ -28,6 +28,7 @@
#include "crypto_curve25519.h"
#include "crypto_ed25519.h"
#include "crypto_format.h"
#include "crypto_rsa.h"
DISABLE_GCC_WARNING(redundant-decls)
@ -611,18 +612,24 @@ crypto_pk_obsolete_private_hybrid_decrypt(crypto_pk_t *env,
int
crypto_pk_get_digest(const crypto_pk_t *pk, char *digest_out)
{
unsigned char *buf = NULL;
char *buf;
size_t buflen;
int len;
int rv = -1;
len = i2d_RSAPublicKey((RSA*)pk->key, &buf);
if (len < 0 || buf == NULL)
return -1;
if (crypto_digest(digest_out, (char*)buf, len) < 0) {
OPENSSL_free(buf);
return -1;
}
OPENSSL_free(buf);
return 0;
buflen = crypto_pk_keysize(pk)*2;
buf = tor_malloc(buflen);
len = crypto_pk_asn1_encode(pk, buf, buflen);
if (len < 0)
goto done;
if (crypto_digest(digest_out, buf, len) < 0)
goto done;
rv = 0;
done:
tor_free(buf);
return rv;
}
/** Compute all digests of the DER encoding of <b>pk</b>, and store them
@ -630,18 +637,24 @@ crypto_pk_get_digest(const crypto_pk_t *pk, char *digest_out)
int
crypto_pk_get_common_digests(crypto_pk_t *pk, common_digests_t *digests_out)
{
unsigned char *buf = NULL;
char *buf;
size_t buflen;
int len;
int rv = -1;
len = i2d_RSAPublicKey(pk->key, &buf);
if (len < 0 || buf == NULL)
return -1;
if (crypto_common_digests(digests_out, (char*)buf, len) < 0) {
OPENSSL_free(buf);
return -1;
}
OPENSSL_free(buf);
return 0;
buflen = crypto_pk_keysize(pk)*2;
buf = tor_malloc(buflen);
len = crypto_pk_asn1_encode(pk, buf, buflen);
if (len < 0)
goto done;
if (crypto_common_digests(digests_out, (char*)buf, len) < 0)
goto done;
rv = 0;
done:
tor_free(buf);
return rv;
}
/** Copy <b>in</b> to the <b>outlen</b>-byte buffer <b>out</b>, adding spaces

53
src/common/crypto_rsa.c
View File

@ -10,17 +10,62 @@
**/
#include "crypto_rsa.h"
#include "crypto.h"
#include "compat_openssl.h"
#include "crypto_curve25519.h"
#include "crypto_ed25519.h"
#include "crypto_format.h"
/** A public key, or a public/private key-pair. */
DISABLE_GCC_WARNING(redundant-decls)
#include <openssl/err.h>
#include <openssl/rsa.h>
#include <openssl/pem.h>
#include <openssl/evp.h>
#include <openssl/engine.h>
#include <openssl/rand.h>
#include <openssl/bn.h>
#include <openssl/dh.h>
#include <openssl/conf.h>
#include <openssl/hmac.h>
ENABLE_GCC_WARNING(redundant-decls)
#include "torlog.h"
#include "util.h"
#include "util_format.h"
/** Declaration for crypto_pk_t structure. */
struct crypto_pk_t
{
int refs; /**< reference count, so we don't have to copy keys */
RSA *key; /**< The key itself */
};
/** Log all pending crypto errors at level <b>severity</b>. Use
* <b>doing</b> to describe our current activities.
*/
static void
crypto_log_errors(int severity, const char *doing)
{
unsigned long 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 (!lib) lib = "(null)";
if (!func) func = "(null)";
if (BUG(!doing)) doing = "(null)";
tor_log(severity, LD_CRYPTO, "crypto error while %s: %s (in %s:%s)",
doing, msg, lib, func);
}
}
/** Return the number of bytes added by padding method <b>padding</b>.
*/
static inline int
int
crypto_get_rsa_padding_overhead(int padding)
{
switch (padding)
@ -32,7 +77,7 @@ crypto_get_rsa_padding_overhead(int padding)
/** Given a padding method <b>padding</b>, return the correct OpenSSL constant.
*/
static inline int
int
crypto_get_rsa_padding(int padding)
{
switch (padding)
@ -714,7 +759,7 @@ crypto_pk_private_sign(const crypto_pk_t *env, char *to, size_t tolen,
* Return -1 on error, or the number of characters used on success.
*/
int
crypto_pk_asn1_encode(crypto_pk_t *pk, char *dest, size_t dest_len)
crypto_pk_asn1_encode(const crypto_pk_t *pk, char *dest, size_t dest_len)
{
int len;
unsigned char *buf = NULL;

8
src/common/crypto_rsa.h
View File

@ -20,6 +20,8 @@
#include "testsupport.h"
#include "compat.h"
#include "util.h"
#include "torlog.h"
#include "crypto_curve25519.h"
/** Length of our public keys. */
#define PK_BYTES (1024/8)
@ -30,12 +32,15 @@
/** Number of bytes added for PKCS1-OAEP padding. */
#define PKCS1_OAEP_PADDING_OVERHEAD 42
/** A public key, or a public/private key-pair. */
typedef struct crypto_pk_t crypto_pk_t;
/* RSA enviroment setup */
MOCK_DECL(crypto_pk_t *,crypto_pk_new,(void));
void crypto_pk_free_(crypto_pk_t *env);
#define crypto_pk_free(pk) FREE_AND_NULL(crypto_pk_t, crypto_pk_free_, (pk))
int crypto_get_rsa_padding_overhead(int padding);
int crypto_get_rsa_padding(int padding);
/* public key crypto */
MOCK_DECL(int, crypto_pk_generate_key_with_bits,(crypto_pk_t *env, int bits));
@ -64,7 +69,6 @@ crypto_pk_t *crypto_pk_dup_key(crypto_pk_t *orig);
crypto_pk_t *crypto_pk_copy_full(crypto_pk_t *orig);
int crypto_pk_key_is_private(const crypto_pk_t *key);
int crypto_pk_public_exponent_ok(crypto_pk_t *env);
int crypto_pk_public_encrypt(crypto_pk_t *env, char *to, size_t tolen,
const char *from, size_t fromlen, int padding);
int crypto_pk_private_decrypt(crypto_pk_t *env, char *to, size_t tolen,
@ -75,7 +79,7 @@ MOCK_DECL(int, crypto_pk_public_checksig,(const crypto_pk_t *env,
const char *from, size_t fromlen));
int crypto_pk_private_sign(const crypto_pk_t *env, char *to, size_t tolen,
const char *from, size_t fromlen);
int crypto_pk_asn1_encode(crypto_pk_t *pk, char *dest, size_t dest_len);
int crypto_pk_asn1_encode(const crypto_pk_t *pk, char *dest, size_t dest_len);
crypto_pk_t *crypto_pk_asn1_decode(const char *str, size_t len);
int crypto_pk_get_fingerprint(crypto_pk_t *pk, char *fp_out,int add_space);
int crypto_pk_get_hashed_fingerprint(crypto_pk_t *pk, char *fp_out);