Diff: polarssl/pk_wrap.c

Revision:

0:137634ff4186

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/polarssl/pk_wrap.c	Thu Jun 11 03:27:03 2015 +0000
@@ -0,0 +1,503 @@
+/*
+ *  Public Key abstraction layer: wrapper functions
+ *
+ *  Copyright (C) 2006-2014, ARM Limited, All Rights Reserved
+ *
+ *  This file is part of mbed TLS (https://tls.mbed.org)
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along
+ *  with this program; if not, write to the Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#if !defined(POLARSSL_CONFIG_FILE)
+#include "polarssl/config.h"
+#else
+#include POLARSSL_CONFIG_FILE
+#endif
+
+#if defined(POLARSSL_PK_C)
+#include "polarssl/pk_wrap.h"
+
+/* Even if RSA not activated, for the sake of RSA-alt */
+#include "polarssl/rsa.h"
+
+#include <string.h>
+
+#if defined(POLARSSL_ECP_C)
+#include "polarssl/ecp.h"
+#endif
+
+#if defined(POLARSSL_ECDSA_C)
+#include "polarssl/ecdsa.h"
+#endif
+
+#if defined(POLARSSL_PLATFORM_C)
+#include "polarssl/platform.h"
+#else
+#include <stdlib.h>
+#define polarssl_malloc     malloc
+#define polarssl_free       free
+#endif
+
+/* Implementation that should never be optimized out by the compiler */
+static void polarssl_zeroize( void *v, size_t n ) {
+    volatile unsigned char *p = v; while( n-- ) *p++ = 0;
+}
+
+#if defined(POLARSSL_RSA_C)
+static int rsa_can_do( pk_type_t type )
+{
+    return( type == POLARSSL_PK_RSA ||
+            type == POLARSSL_PK_RSASSA_PSS );
+}
+
+static size_t rsa_get_size( const void *ctx )
+{
+    return( 8 * ((const rsa_context *) ctx)->len );
+}
+
+static int rsa_verify_wrap( void *ctx, md_type_t md_alg,
+                   const unsigned char *hash, size_t hash_len,
+                   const unsigned char *sig, size_t sig_len )
+{
+    int ret;
+
+    if( sig_len < ((rsa_context *) ctx)->len )
+        return( POLARSSL_ERR_RSA_VERIFY_FAILED );
+
+    if( ( ret = rsa_pkcs1_verify( (rsa_context *) ctx, NULL, NULL,
+                                  RSA_PUBLIC, md_alg,
+                                  (unsigned int) hash_len, hash, sig ) ) != 0 )
+        return( ret );
+
+    if( sig_len > ((rsa_context *) ctx)->len )
+        return( POLARSSL_ERR_PK_SIG_LEN_MISMATCH );
+
+    return( 0 );
+}
+
+static int rsa_sign_wrap( void *ctx, md_type_t md_alg,
+                   const unsigned char *hash, size_t hash_len,
+                   unsigned char *sig, size_t *sig_len,
+                   int (*f_rng)(void *, unsigned char *, size_t), void *p_rng )
+{
+    *sig_len = ((rsa_context *) ctx)->len;
+
+    return( rsa_pkcs1_sign( (rsa_context *) ctx, f_rng, p_rng, RSA_PRIVATE,
+                md_alg, (unsigned int) hash_len, hash, sig ) );
+}
+
+static int rsa_decrypt_wrap( void *ctx,
+                    const unsigned char *input, size_t ilen,
+                    unsigned char *output, size_t *olen, size_t osize,
+                    int (*f_rng)(void *, unsigned char *, size_t), void *p_rng )
+{
+    if( ilen != ((rsa_context *) ctx)->len )
+        return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
+
+    return( rsa_pkcs1_decrypt( (rsa_context *) ctx, f_rng, p_rng,
+                RSA_PRIVATE, olen, input, output, osize ) );
+}
+
+static int rsa_encrypt_wrap( void *ctx,
+                    const unsigned char *input, size_t ilen,
+                    unsigned char *output, size_t *olen, size_t osize,
+                    int (*f_rng)(void *, unsigned char *, size_t), void *p_rng )
+{
+    *olen = ((rsa_context *) ctx)->len;
+
+    if( *olen > osize )
+        return( POLARSSL_ERR_RSA_OUTPUT_TOO_LARGE );
+
+    return( rsa_pkcs1_encrypt( (rsa_context *) ctx,
+                f_rng, p_rng, RSA_PUBLIC, ilen, input, output ) );
+}
+
+static int rsa_check_pair_wrap( const void *pub, const void *prv )
+{
+    return( rsa_check_pub_priv( (const rsa_context *) pub,
+                                (const rsa_context *) prv ) );
+}
+
+static void *rsa_alloc_wrap( void )
+{
+    void *ctx = polarssl_malloc( sizeof( rsa_context ) );
+
+    if( ctx != NULL )
+        rsa_init( (rsa_context *) ctx, 0, 0 );
+
+    return( ctx );
+}
+
+static void rsa_free_wrap( void *ctx )
+{
+    rsa_free( (rsa_context *) ctx );
+    polarssl_free( ctx );
+}
+
+static void rsa_debug( const void *ctx, pk_debug_item *items )
+{
+    items->type = POLARSSL_PK_DEBUG_MPI;
+    items->name = "rsa.N";
+    items->value = &( ((rsa_context *) ctx)->N );
+
+    items++;
+
+    items->type = POLARSSL_PK_DEBUG_MPI;
+    items->name = "rsa.E";
+    items->value = &( ((rsa_context *) ctx)->E );
+}
+
+const pk_info_t rsa_info = {
+    POLARSSL_PK_RSA,
+    "RSA",
+    rsa_get_size,
+    rsa_can_do,
+    rsa_verify_wrap,
+    rsa_sign_wrap,
+    rsa_decrypt_wrap,
+    rsa_encrypt_wrap,
+    rsa_check_pair_wrap,
+    rsa_alloc_wrap,
+    rsa_free_wrap,
+    rsa_debug,
+};
+#endif /* POLARSSL_RSA_C */
+
+#if defined(POLARSSL_ECP_C)
+/*
+ * Generic EC key
+ */
+static int eckey_can_do( pk_type_t type )
+{
+    return( type == POLARSSL_PK_ECKEY ||
+            type == POLARSSL_PK_ECKEY_DH ||
+            type == POLARSSL_PK_ECDSA );
+}
+
+static size_t eckey_get_size( const void *ctx )
+{
+    return( ((ecp_keypair *) ctx)->grp.pbits );
+}
+
+#if defined(POLARSSL_ECDSA_C)
+/* Forward declarations */
+static int ecdsa_verify_wrap( void *ctx, md_type_t md_alg,
+                       const unsigned char *hash, size_t hash_len,
+                       const unsigned char *sig, size_t sig_len );
+
+static int ecdsa_sign_wrap( void *ctx, md_type_t md_alg,
+                   const unsigned char *hash, size_t hash_len,
+                   unsigned char *sig, size_t *sig_len,
+                   int (*f_rng)(void *, unsigned char *, size_t), void *p_rng );
+
+static int eckey_verify_wrap( void *ctx, md_type_t md_alg,
+                       const unsigned char *hash, size_t hash_len,
+                       const unsigned char *sig, size_t sig_len )
+{
+    int ret;
+    ecdsa_context ecdsa;
+
+    ecdsa_init( &ecdsa );
+
+    if( ( ret = ecdsa_from_keypair( &ecdsa, ctx ) ) == 0 )
+        ret = ecdsa_verify_wrap( &ecdsa, md_alg, hash, hash_len, sig, sig_len );
+
+    ecdsa_free( &ecdsa );
+
+    return( ret );
+}
+
+static int eckey_sign_wrap( void *ctx, md_type_t md_alg,
+                   const unsigned char *hash, size_t hash_len,
+                   unsigned char *sig, size_t *sig_len,
+                   int (*f_rng)(void *, unsigned char *, size_t), void *p_rng )
+{
+    int ret;
+    ecdsa_context ecdsa;
+
+    ecdsa_init( &ecdsa );
+
+    if( ( ret = ecdsa_from_keypair( &ecdsa, ctx ) ) == 0 )
+        ret = ecdsa_sign_wrap( &ecdsa, md_alg, hash, hash_len, sig, sig_len,
+                               f_rng, p_rng );
+
+    ecdsa_free( &ecdsa );
+
+    return( ret );
+}
+
+#endif /* POLARSSL_ECDSA_C */
+
+static int eckey_check_pair( const void *pub, const void *prv )
+{
+    return( ecp_check_pub_priv( (const ecp_keypair *) pub,
+                                (const ecp_keypair *) prv ) );
+}
+
+static void *eckey_alloc_wrap( void )
+{
+    void *ctx = polarssl_malloc( sizeof( ecp_keypair ) );
+
+    if( ctx != NULL )
+        ecp_keypair_init( ctx );
+
+    return( ctx );
+}
+
+static void eckey_free_wrap( void *ctx )
+{
+    ecp_keypair_free( (ecp_keypair *) ctx );
+    polarssl_free( ctx );
+}
+
+static void eckey_debug( const void *ctx, pk_debug_item *items )
+{
+    items->type = POLARSSL_PK_DEBUG_ECP;
+    items->name = "eckey.Q";
+    items->value = &( ((ecp_keypair *) ctx)->Q );
+}
+
+const pk_info_t eckey_info = {
+    POLARSSL_PK_ECKEY,
+    "EC",
+    eckey_get_size,
+    eckey_can_do,
+#if defined(POLARSSL_ECDSA_C)
+    eckey_verify_wrap,
+    eckey_sign_wrap,
+#else
+    NULL,
+    NULL,
+#endif
+    NULL,
+    NULL,
+    eckey_check_pair,
+    eckey_alloc_wrap,
+    eckey_free_wrap,
+    eckey_debug,
+};
+
+/*
+ * EC key restricted to ECDH
+ */
+static int eckeydh_can_do( pk_type_t type )
+{
+    return( type == POLARSSL_PK_ECKEY ||
+            type == POLARSSL_PK_ECKEY_DH );
+}
+
+const pk_info_t eckeydh_info = {
+    POLARSSL_PK_ECKEY_DH,
+    "EC_DH",
+    eckey_get_size,         /* Same underlying key structure */
+    eckeydh_can_do,
+    NULL,
+    NULL,
+    NULL,
+    NULL,
+    eckey_check_pair,
+    eckey_alloc_wrap,       /* Same underlying key structure */
+    eckey_free_wrap,        /* Same underlying key structure */
+    eckey_debug,            /* Same underlying key structure */
+};
+#endif /* POLARSSL_ECP_C */
+
+#if defined(POLARSSL_ECDSA_C)
+static int ecdsa_can_do( pk_type_t type )
+{
+    return( type == POLARSSL_PK_ECDSA );
+}
+
+static int ecdsa_verify_wrap( void *ctx, md_type_t md_alg,
+                       const unsigned char *hash, size_t hash_len,
+                       const unsigned char *sig, size_t sig_len )
+{
+    int ret;
+    ((void) md_alg);
+
+    ret = ecdsa_read_signature( (ecdsa_context *) ctx,
+                                hash, hash_len, sig, sig_len );
+
+    if( ret == POLARSSL_ERR_ECP_SIG_LEN_MISMATCH )
+        return( POLARSSL_ERR_PK_SIG_LEN_MISMATCH );
+
+    return( ret );
+}
+
+static int ecdsa_sign_wrap( void *ctx, md_type_t md_alg,
+                   const unsigned char *hash, size_t hash_len,
+                   unsigned char *sig, size_t *sig_len,
+                   int (*f_rng)(void *, unsigned char *, size_t), void *p_rng )
+{
+    /* Use deterministic ECDSA by default if available */
+#if defined(POLARSSL_ECDSA_DETERMINISTIC)
+    ((void) f_rng);
+    ((void) p_rng);
+
+    return( ecdsa_write_signature_det( (ecdsa_context *) ctx,
+                hash, hash_len, sig, sig_len, md_alg ) );
+#else
+    ((void) md_alg);
+
+    return( ecdsa_write_signature( (ecdsa_context *) ctx,
+                hash, hash_len, sig, sig_len, f_rng, p_rng ) );
+#endif /* POLARSSL_ECDSA_DETERMINISTIC */
+}
+
+static void *ecdsa_alloc_wrap( void )
+{
+    void *ctx = polarssl_malloc( sizeof( ecdsa_context ) );
+
+    if( ctx != NULL )
+        ecdsa_init( (ecdsa_context *) ctx );
+
+    return( ctx );
+}
+
+static void ecdsa_free_wrap( void *ctx )
+{
+    ecdsa_free( (ecdsa_context *) ctx );
+    polarssl_free( ctx );
+}
+
+const pk_info_t ecdsa_info = {
+    POLARSSL_PK_ECDSA,
+    "ECDSA",
+    eckey_get_size,     /* Compatible key structures */
+    ecdsa_can_do,
+    ecdsa_verify_wrap,
+    ecdsa_sign_wrap,
+    NULL,
+    NULL,
+    eckey_check_pair,   /* Compatible key structures */
+    ecdsa_alloc_wrap,
+    ecdsa_free_wrap,
+    eckey_debug,        /* Compatible key structures */
+};
+#endif /* POLARSSL_ECDSA_C */
+
+/*
+ * Support for alternative RSA-private implementations
+ */
+
+static int rsa_alt_can_do( pk_type_t type )
+{
+    return( type == POLARSSL_PK_RSA );
+}
+
+static size_t rsa_alt_get_size( const void *ctx )
+{
+    const rsa_alt_context *rsa_alt = (const rsa_alt_context *) ctx;
+
+    return( 8 * rsa_alt->key_len_func( rsa_alt->key ) );
+}
+
+static int rsa_alt_sign_wrap( void *ctx, md_type_t md_alg,
+                   const unsigned char *hash, size_t hash_len,
+                   unsigned char *sig, size_t *sig_len,
+                   int (*f_rng)(void *, unsigned char *, size_t), void *p_rng )
+{
+    rsa_alt_context *rsa_alt = (rsa_alt_context *) ctx;
+
+    *sig_len = rsa_alt->key_len_func( rsa_alt->key );
+
+    return( rsa_alt->sign_func( rsa_alt->key, f_rng, p_rng, RSA_PRIVATE,
+                md_alg, (unsigned int) hash_len, hash, sig ) );
+}
+
+static int rsa_alt_decrypt_wrap( void *ctx,
+                    const unsigned char *input, size_t ilen,
+                    unsigned char *output, size_t *olen, size_t osize,
+                    int (*f_rng)(void *, unsigned char *, size_t), void *p_rng )
+{
+    rsa_alt_context *rsa_alt = (rsa_alt_context *) ctx;
+
+    ((void) f_rng);
+    ((void) p_rng);
+
+    if( ilen != rsa_alt->key_len_func( rsa_alt->key ) )
+        return( POLARSSL_ERR_RSA_BAD_INPUT_DATA );
+
+    return( rsa_alt->decrypt_func( rsa_alt->key,
+                RSA_PRIVATE, olen, input, output, osize ) );
+}
+
+#if defined(POLARSSL_RSA_C)
+static int rsa_alt_check_pair( const void *pub, const void *prv )
+{
+    unsigned char sig[POLARSSL_MPI_MAX_SIZE];
+    unsigned char hash[32];
+    size_t sig_len = 0;
+    int ret;
+
+    if( rsa_alt_get_size( prv ) != rsa_get_size( pub ) )
+        return( POLARSSL_ERR_RSA_KEY_CHECK_FAILED );
+
+    memset( hash, 0x2a, sizeof( hash ) );
+
+    if( ( ret = rsa_alt_sign_wrap( (void *) prv, POLARSSL_MD_NONE,
+                                   hash, sizeof( hash ),
+                                   sig, &sig_len, NULL, NULL ) ) != 0 )
+    {
+        return( ret );
+    }
+
+    if( rsa_verify_wrap( (void *) pub, POLARSSL_MD_NONE,
+                         hash, sizeof( hash ), sig, sig_len ) != 0 )
+    {
+        return( POLARSSL_ERR_RSA_KEY_CHECK_FAILED );
+    }
+
+    return( 0 );
+}
+#endif /* POLARSSL_RSA_C */
+
+static void *rsa_alt_alloc_wrap( void )
+{
+    void *ctx = polarssl_malloc( sizeof( rsa_alt_context ) );
+
+    if( ctx != NULL )
+        memset( ctx, 0, sizeof( rsa_alt_context ) );
+
+    return( ctx );
+}
+
+static void rsa_alt_free_wrap( void *ctx )
+{
+    polarssl_zeroize( ctx, sizeof( rsa_alt_context ) );
+    polarssl_free( ctx );
+}
+
+const pk_info_t rsa_alt_info = {
+    POLARSSL_PK_RSA_ALT,
+    "RSA-alt",
+    rsa_alt_get_size,
+    rsa_alt_can_do,
+    NULL,
+    rsa_alt_sign_wrap,
+    rsa_alt_decrypt_wrap,
+    NULL,
+#if defined(POLARSSL_RSA_C)
+    rsa_alt_check_pair,
+#else
+    NULL,
+#endif
+    rsa_alt_alloc_wrap,
+    rsa_alt_free_wrap,
+    NULL,
+};
+
+#endif /* POLARSSL_PK_C */
+