Moved PKCS#12 PBE functions to cipher / md layer where possible
The 3-key and 2-key Triple DES PBE functions have been replaced with a
single pkcs12_pbe() function that handles both situations (and more).
In addition this allows for some PASSWORD_MISMATCH checking
(cherry picked from commit 14a222cef2699bd3da884662f7e56e097a12b1a0)
diff --git a/library/error.c b/library/error.c
index ae32349..8457004 100644
--- a/library/error.c
+++ b/library/error.c
@@ -248,6 +248,8 @@
snprintf( buf, buflen, "PKCS12 - Feature not available, e.g. unsupported encryption scheme" );
if( use_ret == -(POLARSSL_ERR_PKCS12_PBE_INVALID_FORMAT) )
snprintf( buf, buflen, "PKCS12 - PBE ASN.1 data not as expected" );
+ if( use_ret == -(POLARSSL_ERR_PKCS12_PASSWORD_MISMATCH) )
+ snprintf( buf, buflen, "PKCS12 - Given private key password does not allow for correct decryption" );
#endif /* POLARSSL_PKCS12_C */
#if defined(POLARSSL_PKCS5_C)
diff --git a/library/pkcs12.c b/library/pkcs12.c
index b8f16bf..2ee9c5e 100644
--- a/library/pkcs12.c
+++ b/library/pkcs12.c
@@ -35,6 +35,7 @@
#include "polarssl/pkcs12.h"
#include "polarssl/asn1.h"
+#include "polarssl/cipher.h"
#if defined(POLARSSL_ARC4_C)
#include "polarssl/arc4.h"
@@ -82,7 +83,7 @@
return( 0 );
}
-static int pkcs12_pbe_derive_key_iv( asn1_buf *pbe_params,
+static int pkcs12_pbe_derive_key_iv( asn1_buf *pbe_params, md_type_t md_type,
const unsigned char *pwd, size_t pwdlen,
unsigned char *key, size_t keylen,
unsigned char *iv, size_t ivlen )
@@ -106,7 +107,7 @@
unipwd[i * 2 + 1] = pwd[i];
if( ( ret = pkcs12_derivation( key, keylen, unipwd, pwdlen * 2 + 2,
- salt.p, salt.len, POLARSSL_MD_SHA1,
+ salt.p, salt.len, md_type,
PKCS12_DERIVE_KEY, iterations ) ) != 0 )
{
return( ret );
@@ -116,7 +117,7 @@
return( 0 );
if( ( ret = pkcs12_derivation( iv, ivlen, unipwd, pwdlen * 2 + 2,
- salt.p, salt.len, POLARSSL_MD_SHA1,
+ salt.p, salt.len, md_type,
PKCS12_DERIVE_IV, iterations ) ) != 0 )
{
return( ret );
@@ -144,7 +145,8 @@
arc4_context ctx;
((void) mode);
- if( ( ret = pkcs12_pbe_derive_key_iv( pbe_params, pwd, pwdlen,
+ if( ( ret = pkcs12_pbe_derive_key_iv( pbe_params, POLARSSL_MD_SHA1,
+ pwd, pwdlen,
key, 16, NULL, 0 ) ) != 0 )
{
return( ret );
@@ -158,86 +160,51 @@
#endif /* POLARSSL_ARC4_C */
}
-int pkcs12_pbe_sha1_des2_ede_cbc( asn1_buf *pbe_params, int mode,
- const unsigned char *pwd, size_t pwdlen,
- const unsigned char *data, size_t len,
- unsigned char *output )
+int pkcs12_pbe( asn1_buf *pbe_params, int mode,
+ cipher_type_t cipher_type, md_type_t md_type,
+ const unsigned char *pwd, size_t pwdlen,
+ const unsigned char *data, size_t len,
+ unsigned char *output )
{
-#if !defined(POLARSSL_DES_C)
- ((void) pbe_params);
- ((void) mode);
- ((void) pwd);
- ((void) pwdlen);
- ((void) data);
- ((void) len);
- ((void) output);
- return( POLARSSL_ERR_PKCS12_FEATURE_UNAVAILABLE );
-#else
- int ret;
- unsigned char key[16];
- unsigned char iv[8];
- des3_context ctx;
+ int ret, keylen = 0;
+ unsigned char key[32];
+ unsigned char iv[16];
+ const cipher_info_t *cipher_info;
+ cipher_context_t cipher_ctx;
+ size_t olen = 0;
- if( ( ret = pkcs12_pbe_derive_key_iv( pbe_params, pwd, pwdlen,
- key, 16, iv, 8 ) ) != 0 )
+ cipher_info = cipher_info_from_type( cipher_type );
+ if( cipher_info == NULL )
+ return( POLARSSL_ERR_PKCS12_FEATURE_UNAVAILABLE );
+
+ keylen = cipher_info->key_length / 8;
+
+ if( ( ret = pkcs12_pbe_derive_key_iv( pbe_params, md_type, pwd, pwdlen,
+ key, keylen,
+ iv, cipher_info->iv_size ) ) != 0 )
{
return( ret );
}
- if( mode == PKCS12_PBE_ENCRYPT )
- {
- des3_set2key_enc( &ctx, key );
- des3_crypt_cbc( &ctx, DES_ENCRYPT, len, iv, data, output );
- }
- else
- {
- des3_set2key_dec( &ctx, key );
- des3_crypt_cbc( &ctx, DES_DECRYPT, len, iv, data, output );
- }
+ if( ( ret = cipher_init_ctx( &cipher_ctx, cipher_info ) ) != 0 )
+ return( ret );
- return( 0 );
-#endif /* POLARSSL_DES_C */
-}
+ if( ( ret = cipher_setkey( &cipher_ctx, key, keylen, mode ) ) != 0 )
+ return( ret );
-int pkcs12_pbe_sha1_des3_ede_cbc( asn1_buf *pbe_params, int mode,
- const unsigned char *pwd, size_t pwdlen,
- const unsigned char *data, size_t len,
- unsigned char *output )
-{
-#if !defined(POLARSSL_DES_C)
- ((void) pbe_params);
- ((void) mode);
- ((void) pwd);
- ((void) pwdlen);
- ((void) data);
- ((void) len);
- ((void) output);
- return( POLARSSL_ERR_PKCS12_FEATURE_UNAVAILABLE );
-#else
- int ret;
- unsigned char key[24];
- unsigned char iv[8];
- des3_context ctx;
+ if( ( ret = cipher_reset( &cipher_ctx, iv ) ) != 0 )
+ return( ret );
- if( ( ret = pkcs12_pbe_derive_key_iv( pbe_params, pwd, pwdlen,
- key, 24, iv, 8 ) ) != 0 )
+ if( ( ret = cipher_update( &cipher_ctx, data, len,
+ output, &olen ) ) != 0 )
{
return( ret );
}
- if( mode == PKCS12_PBE_ENCRYPT )
- {
- des3_set3key_enc( &ctx, key );
- des3_crypt_cbc( &ctx, DES_ENCRYPT, len, iv, data, output );
- }
- else
- {
- des3_set3key_dec( &ctx, key );
- des3_crypt_cbc( &ctx, DES_DECRYPT, len, iv, data, output );
- }
+ if( ( ret = cipher_finish( &cipher_ctx, output + olen, &olen ) ) != 0 )
+ return( POLARSSL_ERR_PKCS12_PASSWORD_MISMATCH );
return( 0 );
-#endif /* POLARSSL_DES_C */
}
static void pkcs12_fill_buffer( unsigned char *data, size_t data_len,
diff --git a/library/x509parse.c b/library/x509parse.c
index 0ec5e68..371c470 100644
--- a/library/x509parse.c
+++ b/library/x509parse.c
@@ -62,10 +62,12 @@
#include "polarssl/sha4.h"
#endif
#include "polarssl/dhm.h"
-#include "polarssl/pkcs12.h"
#if defined(POLARSSL_PKCS5_C)
#include "polarssl/pkcs5.h"
#endif
+#if defined(POLARSSL_PKCS12_C)
+#include "polarssl/pkcs12.h"
+#endif
#include <string.h>
#include <stdlib.h>
@@ -2253,23 +2255,28 @@
/*
* Decrypt EncryptedData with appropriate PDE
*/
+#if defined(POLARSSL_PKCS12_C)
if( OID_CMP( OID_PKCS12_PBE_SHA1_DES3_EDE_CBC, &pbe_alg_oid ) )
{
- if( ( ret = pkcs12_pbe_sha1_des3_ede_cbc( &pbe_params,
- PKCS12_PBE_DECRYPT,
- pwd, pwdlen,
- p, len, buf ) ) != 0 )
+ if( ( ret = pkcs12_pbe( &pbe_params, PKCS12_PBE_DECRYPT,
+ POLARSSL_CIPHER_DES_EDE3_CBC, POLARSSL_MD_SHA1,
+ pwd, pwdlen, p, len, buf ) ) != 0 )
{
+ if( ret == POLARSSL_ERR_PKCS12_PASSWORD_MISMATCH )
+ return( POLARSSL_ERR_X509_PASSWORD_MISMATCH );
+
return( ret );
}
}
else if( OID_CMP( OID_PKCS12_PBE_SHA1_DES2_EDE_CBC, &pbe_alg_oid ) )
{
- if( ( ret = pkcs12_pbe_sha1_des2_ede_cbc( &pbe_params,
- PKCS12_PBE_DECRYPT,
- pwd, pwdlen,
- p, len, buf ) ) != 0 )
+ if( ( ret = pkcs12_pbe( &pbe_params, PKCS12_PBE_DECRYPT,
+ POLARSSL_CIPHER_DES_EDE_CBC, POLARSSL_MD_SHA1,
+ pwd, pwdlen, p, len, buf ) ) != 0 )
{
+ if( ret == POLARSSL_ERR_PKCS12_PASSWORD_MISMATCH )
+ return( POLARSSL_ERR_X509_PASSWORD_MISMATCH );
+
return( ret );
}
}
@@ -2282,9 +2289,17 @@
{
return( ret );
}
+
+ // Best guess for password mismatch when using RC4. If first tag is
+ // not ASN1_CONSTRUCTED | ASN1_SEQUENCE
+ //
+ if( *buf != ( ASN1_CONSTRUCTED | ASN1_SEQUENCE ) )
+ return( POLARSSL_ERR_X509_PASSWORD_MISMATCH );
}
+ else
+#endif /* POLARSSL_PKCS12_C */
#if defined(POLARSSL_PKCS5_C)
- else if( OID_CMP( OID_PKCS5_PBES2, &pbe_alg_oid ) )
+ if( OID_CMP( OID_PKCS5_PBES2, &pbe_alg_oid ) )
{
if( ( ret = pkcs5_pbes2( &pbe_params, PKCS5_DECRYPT, pwd, pwdlen,
p, len, buf ) ) != 0 )
@@ -2295,8 +2310,8 @@
return( ret );
}
}
-#endif /* POLARSSL_PKCS5_C */
else
+#endif /* POLARSSL_PKCS5_C */
return( POLARSSL_ERR_X509_FEATURE_UNAVAILABLE );
return x509parse_key_pkcs8_unencrypted_der( rsa, buf, len );
