--- /dev/null
+/*
+ * Public Key abstraction layer: wrapper functions
+ *
+ * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
+ * SPDX-License-Identifier: GPL-2.0
+ *
+ * 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.
+ *
+ * This file is part of mbed TLS (https://tls.mbed.org)
+ */
+
+#if !defined(MBEDTLS_CONFIG_FILE)
+#include "mbedtls/config.h"
+#else
+#include MBEDTLS_CONFIG_FILE
+#endif
+
+#if defined(MBEDTLS_PK_C)
+#include "mbedtls/pk_internal.h"
+
+/* Even if RSA not activated, for the sake of RSA-alt */
+#include "mbedtls/rsa.h"
+
+#include <string.h>
+
+#if defined(MBEDTLS_ECP_C)
+#include "mbedtls/ecp.h"
+#endif
+
+#if defined(MBEDTLS_ECDSA_C)
+#include "mbedtls/ecdsa.h"
+#endif
+
+#if defined(MBEDTLS_PK_RSA_ALT_SUPPORT)
+#include "mbedtls/platform_util.h"
+#endif
+
+#if defined(MBEDTLS_PLATFORM_C)
+#include "mbedtls/platform.h"
+#else
+#include <stdlib.h>
+#define mbedtls_calloc calloc
+#define mbedtls_free free
+#endif
+
+#include <limits.h>
+#include <stdint.h>
+
+#if defined(MBEDTLS_RSA_C)
+static int rsa_can_do( mbedtls_pk_type_t type )
+{
+ return( type == MBEDTLS_PK_RSA ||
+ type == MBEDTLS_PK_RSASSA_PSS );
+}
+
+static size_t rsa_get_bitlen( const void *ctx )
+{
+ const mbedtls_rsa_context * rsa = (const mbedtls_rsa_context *) ctx;
+ return( 8 * mbedtls_rsa_get_len( rsa ) );
+}
+
+static int rsa_verify_wrap( void *ctx, mbedtls_md_type_t md_alg,
+ const unsigned char *hash, size_t hash_len,
+ const unsigned char *sig, size_t sig_len )
+{
+ int ret;
+ mbedtls_rsa_context * rsa = (mbedtls_rsa_context *) ctx;
+ size_t rsa_len = mbedtls_rsa_get_len( rsa );
+
+#if SIZE_MAX > UINT_MAX
+ if( md_alg == MBEDTLS_MD_NONE && UINT_MAX < hash_len )
+ return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
+#endif /* SIZE_MAX > UINT_MAX */
+
+ if( sig_len < rsa_len )
+ return( MBEDTLS_ERR_RSA_VERIFY_FAILED );
+
+ if( ( ret = mbedtls_rsa_pkcs1_verify( rsa, NULL, NULL,
+ MBEDTLS_RSA_PUBLIC, md_alg,
+ (unsigned int) hash_len, hash, sig ) ) != 0 )
+ return( ret );
+
+ /* The buffer contains a valid signature followed by extra data.
+ * We have a special error code for that so that so that callers can
+ * use mbedtls_pk_verify() to check "Does the buffer start with a
+ * valid signature?" and not just "Does the buffer contain a valid
+ * signature?". */
+ if( sig_len > rsa_len )
+ return( MBEDTLS_ERR_PK_SIG_LEN_MISMATCH );
+
+ return( 0 );
+}
+
+static int rsa_sign_wrap( void *ctx, mbedtls_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 )
+{
+ mbedtls_rsa_context * rsa = (mbedtls_rsa_context *) ctx;
+
+#if SIZE_MAX > UINT_MAX
+ if( md_alg == MBEDTLS_MD_NONE && UINT_MAX < hash_len )
+ return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
+#endif /* SIZE_MAX > UINT_MAX */
+
+ *sig_len = mbedtls_rsa_get_len( rsa );
+
+ return( mbedtls_rsa_pkcs1_sign( rsa, f_rng, p_rng, MBEDTLS_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 )
+{
+ mbedtls_rsa_context * rsa = (mbedtls_rsa_context *) ctx;
+
+ if( ilen != mbedtls_rsa_get_len( rsa ) )
+ return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
+
+ return( mbedtls_rsa_pkcs1_decrypt( rsa, f_rng, p_rng,
+ MBEDTLS_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 )
+{
+ mbedtls_rsa_context * rsa = (mbedtls_rsa_context *) ctx;
+ *olen = mbedtls_rsa_get_len( rsa );
+
+ if( *olen > osize )
+ return( MBEDTLS_ERR_RSA_OUTPUT_TOO_LARGE );
+
+ return( mbedtls_rsa_pkcs1_encrypt( rsa, f_rng, p_rng, MBEDTLS_RSA_PUBLIC,
+ ilen, input, output ) );
+}
+
+static int rsa_check_pair_wrap( const void *pub, const void *prv )
+{
+ return( mbedtls_rsa_check_pub_priv( (const mbedtls_rsa_context *) pub,
+ (const mbedtls_rsa_context *) prv ) );
+}
+
+static void *rsa_alloc_wrap( void )
+{
+ void *ctx = mbedtls_calloc( 1, sizeof( mbedtls_rsa_context ) );
+
+ if( ctx != NULL )
+ mbedtls_rsa_init( (mbedtls_rsa_context *) ctx, 0, 0 );
+
+ return( ctx );
+}
+
+static void rsa_free_wrap( void *ctx )
+{
+ mbedtls_rsa_free( (mbedtls_rsa_context *) ctx );
+ mbedtls_free( ctx );
+}
+
+static void rsa_debug( const void *ctx, mbedtls_pk_debug_item *items )
+{
+ items->type = MBEDTLS_PK_DEBUG_MPI;
+ items->name = "rsa.N";
+ items->value = &( ((mbedtls_rsa_context *) ctx)->N );
+
+ items++;
+
+ items->type = MBEDTLS_PK_DEBUG_MPI;
+ items->name = "rsa.E";
+ items->value = &( ((mbedtls_rsa_context *) ctx)->E );
+}
+
+const mbedtls_pk_info_t mbedtls_rsa_info = {
+ MBEDTLS_PK_RSA,
+ "RSA",
+ rsa_get_bitlen,
+ 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 /* MBEDTLS_RSA_C */
+
+#if defined(MBEDTLS_ECP_C)
+/*
+ * Generic EC key
+ */
+static int eckey_can_do( mbedtls_pk_type_t type )
+{
+ return( type == MBEDTLS_PK_ECKEY ||
+ type == MBEDTLS_PK_ECKEY_DH ||
+ type == MBEDTLS_PK_ECDSA );
+}
+
+static size_t eckey_get_bitlen( const void *ctx )
+{
+ return( ((mbedtls_ecp_keypair *) ctx)->grp.pbits );
+}
+
+#if defined(MBEDTLS_ECDSA_C)
+/* Forward declarations */
+static int ecdsa_verify_wrap( void *ctx, mbedtls_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, mbedtls_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, mbedtls_md_type_t md_alg,
+ const unsigned char *hash, size_t hash_len,
+ const unsigned char *sig, size_t sig_len )
+{
+ int ret;
+ mbedtls_ecdsa_context ecdsa;
+
+ mbedtls_ecdsa_init( &ecdsa );
+
+ if( ( ret = mbedtls_ecdsa_from_keypair( &ecdsa, ctx ) ) == 0 )
+ ret = ecdsa_verify_wrap( &ecdsa, md_alg, hash, hash_len, sig, sig_len );
+
+ mbedtls_ecdsa_free( &ecdsa );
+
+ return( ret );
+}
+
+static int eckey_sign_wrap( void *ctx, mbedtls_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;
+ mbedtls_ecdsa_context ecdsa;
+
+ mbedtls_ecdsa_init( &ecdsa );
+
+ if( ( ret = mbedtls_ecdsa_from_keypair( &ecdsa, ctx ) ) == 0 )
+ ret = ecdsa_sign_wrap( &ecdsa, md_alg, hash, hash_len, sig, sig_len,
+ f_rng, p_rng );
+
+ mbedtls_ecdsa_free( &ecdsa );
+
+ return( ret );
+}
+
+#endif /* MBEDTLS_ECDSA_C */
+
+static int eckey_check_pair( const void *pub, const void *prv )
+{
+ return( mbedtls_ecp_check_pub_priv( (const mbedtls_ecp_keypair *) pub,
+ (const mbedtls_ecp_keypair *) prv ) );
+}
+
+static void *eckey_alloc_wrap( void )
+{
+ void *ctx = mbedtls_calloc( 1, sizeof( mbedtls_ecp_keypair ) );
+
+ if( ctx != NULL )
+ mbedtls_ecp_keypair_init( ctx );
+
+ return( ctx );
+}
+
+static void eckey_free_wrap( void *ctx )
+{
+ mbedtls_ecp_keypair_free( (mbedtls_ecp_keypair *) ctx );
+ mbedtls_free( ctx );
+}
+
+static void eckey_debug( const void *ctx, mbedtls_pk_debug_item *items )
+{
+ items->type = MBEDTLS_PK_DEBUG_ECP;
+ items->name = "eckey.Q";
+ items->value = &( ((mbedtls_ecp_keypair *) ctx)->Q );
+}
+
+const mbedtls_pk_info_t mbedtls_eckey_info = {
+ MBEDTLS_PK_ECKEY,
+ "EC",
+ eckey_get_bitlen,
+ eckey_can_do,
+#if defined(MBEDTLS_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( mbedtls_pk_type_t type )
+{
+ return( type == MBEDTLS_PK_ECKEY ||
+ type == MBEDTLS_PK_ECKEY_DH );
+}
+
+const mbedtls_pk_info_t mbedtls_eckeydh_info = {
+ MBEDTLS_PK_ECKEY_DH,
+ "EC_DH",
+ eckey_get_bitlen, /* 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 /* MBEDTLS_ECP_C */
+
+#if defined(MBEDTLS_ECDSA_C)
+static int ecdsa_can_do( mbedtls_pk_type_t type )
+{
+ return( type == MBEDTLS_PK_ECDSA );
+}
+
+static int ecdsa_verify_wrap( void *ctx, mbedtls_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 = mbedtls_ecdsa_read_signature( (mbedtls_ecdsa_context *) ctx,
+ hash, hash_len, sig, sig_len );
+
+ if( ret == MBEDTLS_ERR_ECP_SIG_LEN_MISMATCH )
+ return( MBEDTLS_ERR_PK_SIG_LEN_MISMATCH );
+
+ return( ret );
+}
+
+static int ecdsa_sign_wrap( void *ctx, mbedtls_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 )
+{
+ return( mbedtls_ecdsa_write_signature( (mbedtls_ecdsa_context *) ctx,
+ md_alg, hash, hash_len, sig, sig_len, f_rng, p_rng ) );
+}
+
+static void *ecdsa_alloc_wrap( void )
+{
+ void *ctx = mbedtls_calloc( 1, sizeof( mbedtls_ecdsa_context ) );
+
+ if( ctx != NULL )
+ mbedtls_ecdsa_init( (mbedtls_ecdsa_context *) ctx );
+
+ return( ctx );
+}
+
+static void ecdsa_free_wrap( void *ctx )
+{
+ mbedtls_ecdsa_free( (mbedtls_ecdsa_context *) ctx );
+ mbedtls_free( ctx );
+}
+
+const mbedtls_pk_info_t mbedtls_ecdsa_info = {
+ MBEDTLS_PK_ECDSA,
+ "ECDSA",
+ eckey_get_bitlen, /* 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 /* MBEDTLS_ECDSA_C */
+
+#if defined(MBEDTLS_PK_RSA_ALT_SUPPORT)
+/*
+ * Support for alternative RSA-private implementations
+ */
+
+static int rsa_alt_can_do( mbedtls_pk_type_t type )
+{
+ return( type == MBEDTLS_PK_RSA );
+}
+
+static size_t rsa_alt_get_bitlen( const void *ctx )
+{
+ const mbedtls_rsa_alt_context *rsa_alt = (const mbedtls_rsa_alt_context *) ctx;
+
+ return( 8 * rsa_alt->key_len_func( rsa_alt->key ) );
+}
+
+static int rsa_alt_sign_wrap( void *ctx, mbedtls_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 )
+{
+ mbedtls_rsa_alt_context *rsa_alt = (mbedtls_rsa_alt_context *) ctx;
+
+#if SIZE_MAX > UINT_MAX
+ if( UINT_MAX < hash_len )
+ return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
+#endif /* SIZE_MAX > UINT_MAX */
+
+ *sig_len = rsa_alt->key_len_func( rsa_alt->key );
+
+ return( rsa_alt->sign_func( rsa_alt->key, f_rng, p_rng, MBEDTLS_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 )
+{
+ mbedtls_rsa_alt_context *rsa_alt = (mbedtls_rsa_alt_context *) ctx;
+
+ ((void) f_rng);
+ ((void) p_rng);
+
+ if( ilen != rsa_alt->key_len_func( rsa_alt->key ) )
+ return( MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
+
+ return( rsa_alt->decrypt_func( rsa_alt->key,
+ MBEDTLS_RSA_PRIVATE, olen, input, output, osize ) );
+}
+
+#if defined(MBEDTLS_RSA_C)
+static int rsa_alt_check_pair( const void *pub, const void *prv )
+{
+ unsigned char sig[MBEDTLS_MPI_MAX_SIZE];
+ unsigned char hash[32];
+ size_t sig_len = 0;
+ int ret;
+
+ if( rsa_alt_get_bitlen( prv ) != rsa_get_bitlen( pub ) )
+ return( MBEDTLS_ERR_RSA_KEY_CHECK_FAILED );
+
+ memset( hash, 0x2a, sizeof( hash ) );
+
+ if( ( ret = rsa_alt_sign_wrap( (void *) prv, MBEDTLS_MD_NONE,
+ hash, sizeof( hash ),
+ sig, &sig_len, NULL, NULL ) ) != 0 )
+ {
+ return( ret );
+ }
+
+ if( rsa_verify_wrap( (void *) pub, MBEDTLS_MD_NONE,
+ hash, sizeof( hash ), sig, sig_len ) != 0 )
+ {
+ return( MBEDTLS_ERR_RSA_KEY_CHECK_FAILED );
+ }
+
+ return( 0 );
+}
+#endif /* MBEDTLS_RSA_C */
+
+static void *rsa_alt_alloc_wrap( void )
+{
+ void *ctx = mbedtls_calloc( 1, sizeof( mbedtls_rsa_alt_context ) );
+
+ if( ctx != NULL )
+ memset( ctx, 0, sizeof( mbedtls_rsa_alt_context ) );
+
+ return( ctx );
+}
+
+static void rsa_alt_free_wrap( void *ctx )
+{
+ mbedtls_platform_zeroize( ctx, sizeof( mbedtls_rsa_alt_context ) );
+ mbedtls_free( ctx );
+}
+
+const mbedtls_pk_info_t mbedtls_rsa_alt_info = {
+ MBEDTLS_PK_RSA_ALT,
+ "RSA-alt",
+ rsa_alt_get_bitlen,
+ rsa_alt_can_do,
+ NULL,
+ rsa_alt_sign_wrap,
+ rsa_alt_decrypt_wrap,
+ NULL,
+#if defined(MBEDTLS_RSA_C)
+ rsa_alt_check_pair,
+#else
+ NULL,
+#endif
+ rsa_alt_alloc_wrap,
+ rsa_alt_free_wrap,
+ NULL,
+};
+
+#endif /* MBEDTLS_PK_RSA_ALT_SUPPORT */
+
+#endif /* MBEDTLS_PK_C */
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