Hannes Tschofenig
Example program to test AES-GCM functionality. Used for a workshop
Diff: SSL/library/pkparse.c
- Revision:
- 0:796d0f61a05b
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/SSL/library/pkparse.c Thu Sep 27 06:34:22 2018 +0000
@@ -0,0 +1,1253 @@
+/*
+ * Public Key layer for parsing key files and structures
+ *
+ * Copyright (C) 2006-2014, Brainspark B.V.
+ *
+ * This file is part of PolarSSL (http://www.polarssl.org)
+ * Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
+ *
+ * All rights reserved.
+ *
+ * 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_PARSE_C)
+
+#include "polarssl/pk.h"
+#include "polarssl/asn1.h"
+#include "polarssl/oid.h"
+
+#if defined(POLARSSL_RSA_C)
+#include "polarssl/rsa.h"
+#endif
+#if defined(POLARSSL_ECP_C)
+#include "polarssl/ecp.h"
+#endif
+#if defined(POLARSSL_ECDSA_C)
+#include "polarssl/ecdsa.h"
+#endif
+#if defined(POLARSSL_PEM_PARSE_C)
+#include "polarssl/pem.h"
+#endif
+#if defined(POLARSSL_PKCS5_C)
+#include "polarssl/pkcs5.h"
+#endif
+#if defined(POLARSSL_PKCS12_C)
+#include "polarssl/pkcs12.h"
+#endif
+
+#if defined(POLARSSL_PLATFORM_C)
+#include "polarssl/platform.h"
+#else
+#include <stdlib.h>
+#define polarssl_malloc malloc
+#define polarssl_free free
+#endif
+
+#if defined(POLARSSL_FS_IO)
+/*
+ * Load all data from a file into a given buffer.
+ */
+static int load_file( const char *path, unsigned char **buf, size_t *n )
+{
+ FILE *f;
+ long size;
+
+ if( ( f = fopen( path, "rb" ) ) == NULL )
+ return( POLARSSL_ERR_PK_FILE_IO_ERROR );
+
+ fseek( f, 0, SEEK_END );
+ if( ( size = ftell( f ) ) == -1 )
+ {
+ fclose( f );
+ return( POLARSSL_ERR_PK_FILE_IO_ERROR );
+ }
+ fseek( f, 0, SEEK_SET );
+
+ *n = (size_t) size;
+
+ if( *n + 1 == 0 ||
+ ( *buf = (unsigned char *) polarssl_malloc( *n + 1 ) ) == NULL )
+ {
+ fclose( f );
+ return( POLARSSL_ERR_PK_MALLOC_FAILED );
+ }
+
+ if( fread( *buf, 1, *n, f ) != *n )
+ {
+ fclose( f );
+ polarssl_free( *buf );
+ return( POLARSSL_ERR_PK_FILE_IO_ERROR );
+ }
+
+ fclose( f );
+
+ (*buf)[*n] = '\0';
+
+ return( 0 );
+}
+
+/*
+ * Load and parse a private key
+ */
+int pk_parse_keyfile( pk_context *ctx,
+ const char *path, const char *pwd )
+{
+ int ret;
+ size_t n;
+ unsigned char *buf;
+
+ if ( (ret = load_file( path, &buf, &n ) ) != 0 )
+ return( ret );
+
+ if( pwd == NULL )
+ ret = pk_parse_key( ctx, buf, n, NULL, 0 );
+ else
+ ret = pk_parse_key( ctx, buf, n,
+ (const unsigned char *) pwd, strlen( pwd ) );
+
+ memset( buf, 0, n + 1 );
+ polarssl_free( buf );
+
+ return( ret );
+}
+
+/*
+ * Load and parse a public key
+ */
+int pk_parse_public_keyfile( pk_context *ctx, const char *path )
+{
+ int ret;
+ size_t n;
+ unsigned char *buf;
+
+ if ( (ret = load_file( path, &buf, &n ) ) != 0 )
+ return( ret );
+
+ ret = pk_parse_public_key( ctx, buf, n );
+
+ memset( buf, 0, n + 1 );
+ polarssl_free( buf );
+
+ return( ret );
+}
+#endif /* POLARSSL_FS_IO */
+
+#if defined(POLARSSL_ECP_C)
+/* Minimally parse an ECParameters buffer to and asn1_buf
+ *
+ * ECParameters ::= CHOICE {
+ * namedCurve OBJECT IDENTIFIER
+ * specifiedCurve SpecifiedECDomain -- = SEQUENCE { ... }
+ * -- implicitCurve NULL
+ * }
+ */
+static int pk_get_ecparams( unsigned char **p, const unsigned char *end,
+ asn1_buf *params )
+{
+ int ret;
+
+ /* Tag may be either OID or SEQUENCE */
+ params->tag = **p;
+ if( params->tag != ASN1_OID
+#if defined(POLARSSL_PK_PARSE_EC_EXTENDED)
+ && params->tag != ( ASN1_CONSTRUCTED | ASN1_SEQUENCE )
+#endif
+ )
+ {
+ return( POLARSSL_ERR_PK_KEY_INVALID_FORMAT +
+ POLARSSL_ERR_ASN1_UNEXPECTED_TAG );
+ }
+
+ if( ( ret = asn1_get_tag( p, end, ¶ms->len, params->tag ) ) != 0 )
+ {
+ return( POLARSSL_ERR_PK_KEY_INVALID_FORMAT + ret );
+ }
+
+ params->p = *p;
+ *p += params->len;
+
+ if( *p != end )
+ return( POLARSSL_ERR_PK_KEY_INVALID_FORMAT +
+ POLARSSL_ERR_ASN1_LENGTH_MISMATCH );
+
+ return( 0 );
+}
+
+#if defined(POLARSSL_PK_PARSE_EC_EXTENDED)
+/*
+ * Parse a SpecifiedECDomain (SEC 1 C.2) and (mostly) fill the group with it.
+ * WARNING: the resulting group should only be used with
+ * pk_group_id_from_specified(), since its base point may not be set correctly
+ * if it was encoded compressed.
+ *
+ * SpecifiedECDomain ::= SEQUENCE {
+ * version SpecifiedECDomainVersion(ecdpVer1 | ecdpVer2 | ecdpVer3, ...),
+ * fieldID FieldID {{FieldTypes}},
+ * curve Curve,
+ * base ECPoint,
+ * order INTEGER,
+ * cofactor INTEGER OPTIONAL,
+ * hash HashAlgorithm OPTIONAL,
+ * ...
+ * }
+ *
+ * We only support prime-field as field type, and ignore hash and cofactor.
+ */
+static int pk_group_from_specified( const asn1_buf *params, ecp_group *grp )
+{
+ int ret;
+ unsigned char *p = params->p;
+ const unsigned char * const end = params->p + params->len;
+ const unsigned char *end_field, *end_curve;
+ size_t len;
+ int ver;
+
+ /* SpecifiedECDomainVersion ::= INTEGER { 1, 2, 3 } */
+ if( ( ret = asn1_get_int( &p, end, &ver ) ) != 0 )
+ return( POLARSSL_ERR_PK_KEY_INVALID_FORMAT + ret );
+
+ if( ver < 1 || ver > 3 )
+ return( POLARSSL_ERR_PK_KEY_INVALID_FORMAT );
+
+ /*
+ * FieldID { FIELD-ID:IOSet } ::= SEQUENCE { -- Finite field
+ * fieldType FIELD-ID.&id({IOSet}),
+ * parameters FIELD-ID.&Type({IOSet}{@fieldType})
+ * }
+ */
+ if( ( ret = asn1_get_tag( &p, end, &len,
+ ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ) != 0 )
+ return( ret );
+
+ end_field = p + len;
+
+ /*
+ * FIELD-ID ::= TYPE-IDENTIFIER
+ * FieldTypes FIELD-ID ::= {
+ * { Prime-p IDENTIFIED BY prime-field } |
+ * { Characteristic-two IDENTIFIED BY characteristic-two-field }
+ * }
+ * prime-field OBJECT IDENTIFIER ::= { id-fieldType 1 }
+ */
+ if( ( ret = asn1_get_tag( &p, end_field, &len, ASN1_OID ) ) != 0 )
+ return( ret );
+
+ if( len != OID_SIZE( OID_ANSI_X9_62_PRIME_FIELD ) ||
+ memcmp( p, OID_ANSI_X9_62_PRIME_FIELD, len ) != 0 )
+ {
+ return( POLARSSL_ERR_PK_FEATURE_UNAVAILABLE );
+ }
+
+ p += len;
+
+ /* Prime-p ::= INTEGER -- Field of size p. */
+ if( ( ret = asn1_get_mpi( &p, end_field, &grp->P ) ) != 0 )
+ return( POLARSSL_ERR_PK_KEY_INVALID_FORMAT + ret );
+
+ grp->pbits = mpi_msb( &grp->P );
+
+ if( p != end_field )
+ return( POLARSSL_ERR_PK_KEY_INVALID_FORMAT +
+ POLARSSL_ERR_ASN1_LENGTH_MISMATCH );
+
+ /*
+ * Curve ::= SEQUENCE {
+ * a FieldElement,
+ * b FieldElement,
+ * seed BIT STRING OPTIONAL
+ * -- Shall be present if used in SpecifiedECDomain
+ * -- with version equal to ecdpVer2 or ecdpVer3
+ * }
+ */
+ if( ( ret = asn1_get_tag( &p, end, &len,
+ ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ) != 0 )
+ return( ret );
+
+ end_curve = p + len;
+
+ /*
+ * FieldElement ::= OCTET STRING
+ * containing an integer in the case of a prime field
+ */
+ if( ( ret = asn1_get_tag( &p, end_curve, &len, ASN1_OCTET_STRING ) ) != 0 ||
+ ( ret = mpi_read_binary( &grp->A, p, len ) ) != 0 )
+ {
+ return( POLARSSL_ERR_PK_KEY_INVALID_FORMAT + ret );
+ }
+
+ p += len;
+
+ if( ( ret = asn1_get_tag( &p, end_curve, &len, ASN1_OCTET_STRING ) ) != 0 ||
+ ( ret = mpi_read_binary( &grp->B, p, len ) ) != 0 )
+ {
+ return( POLARSSL_ERR_PK_KEY_INVALID_FORMAT + ret );
+ }
+
+ p += len;
+
+ /* Ignore seed BIT STRING OPTIONAL */
+ if( ( ret = asn1_get_tag( &p, end_curve, &len, ASN1_BIT_STRING ) ) == 0 )
+ p += len;
+
+ if( p != end_curve )
+ return( POLARSSL_ERR_PK_KEY_INVALID_FORMAT +
+ POLARSSL_ERR_ASN1_LENGTH_MISMATCH );
+
+ /*
+ * ECPoint ::= OCTET STRING
+ */
+ if( ( ret = asn1_get_tag( &p, end, &len, ASN1_OCTET_STRING ) ) != 0 )
+ return( POLARSSL_ERR_PK_KEY_INVALID_FORMAT + ret );
+
+ if( ( ret = ecp_point_read_binary( grp, &grp->G,
+ ( const unsigned char *) p, len ) ) != 0 )
+ {
+ /*
+ * If we can't read the point because it's compressed, cheat by
+ * reading only the X coordinate and the parity bit of Y.
+ */
+ if( ret != POLARSSL_ERR_ECP_FEATURE_UNAVAILABLE ||
+ ( p[0] != 0x02 && p[0] != 0x03 ) ||
+ len != mpi_size( &grp->P ) + 1 ||
+ mpi_read_binary( &grp->G.X, p + 1, len - 1 ) != 0 ||
+ mpi_lset( &grp->G.Y, p[0] - 2 ) != 0 ||
+ mpi_lset( &grp->G.Z, 1 ) != 0 )
+ {
+ return( POLARSSL_ERR_PK_KEY_INVALID_FORMAT );
+ }
+ }
+
+ p += len;
+
+ /*
+ * order INTEGER
+ */
+ if( ( ret = asn1_get_mpi( &p, end, &grp->N ) ) )
+ return( POLARSSL_ERR_PK_KEY_INVALID_FORMAT + ret );
+
+ grp->nbits = mpi_msb( &grp->N );
+
+ /*
+ * Allow optional elements by purposefully not enforcing p == end here.
+ */
+
+ return( 0 );
+}
+
+/*
+ * Find the group id associated with an (almost filled) group as generated by
+ * pk_group_from_specified(), or return an error if unknown.
+ */
+static int pk_group_id_from_group( const ecp_group *grp, ecp_group_id *grp_id )
+{
+ int ret = 0;
+ ecp_group ref;
+ const ecp_group_id *id;
+
+ ecp_group_init( &ref );
+
+ for( id = ecp_grp_id_list(); *id != POLARSSL_ECP_DP_NONE; id++ )
+ {
+ /* Load the group associated to that id */
+ ecp_group_free( &ref );
+ MPI_CHK( ecp_use_known_dp( &ref, *id ) );
+
+ /* Compare to the group we were given, starting with easy tests */
+ if( grp->pbits == ref.pbits && grp->nbits == ref.nbits &&
+ mpi_cmp_mpi( &grp->P, &ref.P ) == 0 &&
+ mpi_cmp_mpi( &grp->A, &ref.A ) == 0 &&
+ mpi_cmp_mpi( &grp->B, &ref.B ) == 0 &&
+ mpi_cmp_mpi( &grp->N, &ref.N ) == 0 &&
+ mpi_cmp_mpi( &grp->G.X, &ref.G.X ) == 0 &&
+ mpi_cmp_mpi( &grp->G.Z, &ref.G.Z ) == 0 &&
+ /* For Y we may only know the parity bit, so compare only that */
+ mpi_get_bit( &grp->G.Y, 0 ) == mpi_get_bit( &ref.G.Y, 0 ) )
+ {
+ break;
+ }
+
+ }
+
+cleanup:
+ ecp_group_free( &ref );
+
+ *grp_id = *id;
+
+ if( ret == 0 && *id == POLARSSL_ECP_DP_NONE )
+ ret = POLARSSL_ERR_ECP_FEATURE_UNAVAILABLE;
+
+ return( ret );
+}
+
+/*
+ * Parse a SpecifiedECDomain (SEC 1 C.2) and find the associated group ID
+ */
+static int pk_group_id_from_specified( const asn1_buf *params,
+ ecp_group_id *grp_id )
+{
+ int ret;
+ ecp_group grp;
+
+ ecp_group_init( &grp );
+
+ if( ( ret = pk_group_from_specified( params, &grp ) ) != 0 )
+ goto cleanup;
+
+ ret = pk_group_id_from_group( &grp, grp_id );
+
+cleanup:
+ ecp_group_free( &grp );
+
+ return( ret );
+}
+#endif /* POLARSSL_PK_PARSE_EC_EXTENDED */
+
+/*
+ * Use EC parameters to initialise an EC group
+ *
+ * ECParameters ::= CHOICE {
+ * namedCurve OBJECT IDENTIFIER
+ * specifiedCurve SpecifiedECDomain -- = SEQUENCE { ... }
+ * -- implicitCurve NULL
+ */
+static int pk_use_ecparams( const asn1_buf *params, ecp_group *grp )
+{
+ int ret;
+ ecp_group_id grp_id;
+
+ if( params->tag == ASN1_OID )
+ {
+ if( oid_get_ec_grp( params, &grp_id ) != 0 )
+ return( POLARSSL_ERR_PK_UNKNOWN_NAMED_CURVE );
+ }
+ else
+ {
+#if defined(POLARSSL_PK_PARSE_EC_EXTENDED)
+ if( ( ret = pk_group_id_from_specified( params, &grp_id ) ) != 0 )
+ return( ret );
+#else
+ return( POLARSSL_ERR_PK_KEY_INVALID_FORMAT );
+#endif
+ }
+
+ /*
+ * grp may already be initilialized; if so, make sure IDs match
+ */
+ if( grp->id != POLARSSL_ECP_DP_NONE && grp->id != grp_id )
+ return( POLARSSL_ERR_PK_KEY_INVALID_FORMAT );
+
+ if( ( ret = ecp_use_known_dp( grp, grp_id ) ) != 0 )
+ return( ret );
+
+ return( 0 );
+}
+
+/*
+ * EC public key is an EC point
+ *
+ * The caller is responsible for clearing the structure upon failure if
+ * desired. Take care to pass along the possible ECP_FEATURE_UNAVAILABLE
+ * return code of ecp_point_read_binary() and leave p in a usable state.
+ */
+static int pk_get_ecpubkey( unsigned char **p, const unsigned char *end,
+ ecp_keypair *key )
+{
+ int ret;
+
+ if( ( ret = ecp_point_read_binary( &key->grp, &key->Q,
+ (const unsigned char *) *p, end - *p ) ) == 0 )
+ {
+ ret = ecp_check_pubkey( &key->grp, &key->Q );
+ }
+
+ /*
+ * We know ecp_point_read_binary consumed all bytes or failed
+ */
+ *p = (unsigned char *) end;
+
+ return( ret );
+}
+#endif /* POLARSSL_ECP_C */
+
+#if defined(POLARSSL_RSA_C)
+/*
+ * RSAPublicKey ::= SEQUENCE {
+ * modulus INTEGER, -- n
+ * publicExponent INTEGER -- e
+ * }
+ */
+static int pk_get_rsapubkey( unsigned char **p,
+ const unsigned char *end,
+ rsa_context *rsa )
+{
+ int ret;
+ size_t len;
+
+ if( ( ret = asn1_get_tag( p, end, &len,
+ ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ) != 0 )
+ return( POLARSSL_ERR_PK_INVALID_PUBKEY + ret );
+
+ if( *p + len != end )
+ return( POLARSSL_ERR_PK_INVALID_PUBKEY +
+ POLARSSL_ERR_ASN1_LENGTH_MISMATCH );
+
+ if( ( ret = asn1_get_mpi( p, end, &rsa->N ) ) != 0 ||
+ ( ret = asn1_get_mpi( p, end, &rsa->E ) ) != 0 )
+ return( POLARSSL_ERR_PK_INVALID_PUBKEY + ret );
+
+ if( *p != end )
+ return( POLARSSL_ERR_PK_INVALID_PUBKEY +
+ POLARSSL_ERR_ASN1_LENGTH_MISMATCH );
+
+ if( ( ret = rsa_check_pubkey( rsa ) ) != 0 )
+ return( POLARSSL_ERR_PK_INVALID_PUBKEY );
+
+ rsa->len = mpi_size( &rsa->N );
+
+ return( 0 );
+}
+#endif /* POLARSSL_RSA_C */
+
+/* Get a PK algorithm identifier
+ *
+ * AlgorithmIdentifier ::= SEQUENCE {
+ * algorithm OBJECT IDENTIFIER,
+ * parameters ANY DEFINED BY algorithm OPTIONAL }
+ */
+static int pk_get_pk_alg( unsigned char **p,
+ const unsigned char *end,
+ pk_type_t *pk_alg, asn1_buf *params )
+{
+ int ret;
+ asn1_buf alg_oid;
+
+ memset( params, 0, sizeof(asn1_buf) );
+
+ if( ( ret = asn1_get_alg( p, end, &alg_oid, params ) ) != 0 )
+ return( POLARSSL_ERR_PK_INVALID_ALG + ret );
+
+ if( oid_get_pk_alg( &alg_oid, pk_alg ) != 0 )
+ return( POLARSSL_ERR_PK_UNKNOWN_PK_ALG );
+
+ /*
+ * No parameters with RSA (only for EC)
+ */
+ if( *pk_alg == POLARSSL_PK_RSA &&
+ ( ( params->tag != ASN1_NULL && params->tag != 0 ) ||
+ params->len != 0 ) )
+ {
+ return( POLARSSL_ERR_PK_INVALID_ALG );
+ }
+
+ return( 0 );
+}
+
+/*
+ * SubjectPublicKeyInfo ::= SEQUENCE {
+ * algorithm AlgorithmIdentifier,
+ * subjectPublicKey BIT STRING }
+ */
+int pk_parse_subpubkey( unsigned char **p, const unsigned char *end,
+ pk_context *pk )
+{
+ int ret;
+ size_t len;
+ asn1_buf alg_params;
+ pk_type_t pk_alg = POLARSSL_PK_NONE;
+ const pk_info_t *pk_info;
+
+ if( ( ret = asn1_get_tag( p, end, &len,
+ ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ) != 0 )
+ {
+ return( POLARSSL_ERR_PK_KEY_INVALID_FORMAT + ret );
+ }
+
+ end = *p + len;
+
+ if( ( ret = pk_get_pk_alg( p, end, &pk_alg, &alg_params ) ) != 0 )
+ return( ret );
+
+ if( ( ret = asn1_get_bitstring_null( p, end, &len ) ) != 0 )
+ return( POLARSSL_ERR_PK_INVALID_PUBKEY + ret );
+
+ if( *p + len != end )
+ return( POLARSSL_ERR_PK_INVALID_PUBKEY +
+ POLARSSL_ERR_ASN1_LENGTH_MISMATCH );
+
+ if( ( pk_info = pk_info_from_type( pk_alg ) ) == NULL )
+ return( POLARSSL_ERR_PK_UNKNOWN_PK_ALG );
+
+ if( ( ret = pk_init_ctx( pk, pk_info ) ) != 0 )
+ return( ret );
+
+#if defined(POLARSSL_RSA_C)
+ if( pk_alg == POLARSSL_PK_RSA )
+ {
+ ret = pk_get_rsapubkey( p, end, pk_rsa( *pk ) );
+ } else
+#endif /* POLARSSL_RSA_C */
+#if defined(POLARSSL_ECP_C)
+ if( pk_alg == POLARSSL_PK_ECKEY_DH || pk_alg == POLARSSL_PK_ECKEY )
+ {
+ ret = pk_use_ecparams( &alg_params, &pk_ec( *pk )->grp );
+ if( ret == 0 )
+ ret = pk_get_ecpubkey( p, end, pk_ec( *pk ) );
+ } else
+#endif /* POLARSSL_ECP_C */
+ ret = POLARSSL_ERR_PK_UNKNOWN_PK_ALG;
+
+ if( ret == 0 && *p != end )
+ ret = POLARSSL_ERR_PK_INVALID_PUBKEY
+ POLARSSL_ERR_ASN1_LENGTH_MISMATCH;
+
+ if( ret != 0 )
+ pk_free( pk );
+
+ return( ret );
+}
+
+#if defined(POLARSSL_RSA_C)
+/*
+ * Parse a PKCS#1 encoded private RSA key
+ */
+static int pk_parse_key_pkcs1_der( rsa_context *rsa,
+ const unsigned char *key,
+ size_t keylen )
+{
+ int ret;
+ size_t len;
+ unsigned char *p, *end;
+
+ p = (unsigned char *) key;
+ end = p + keylen;
+
+ /*
+ * This function parses the RSAPrivateKey (PKCS#1)
+ *
+ * RSAPrivateKey ::= SEQUENCE {
+ * version Version,
+ * modulus INTEGER, -- n
+ * publicExponent INTEGER, -- e
+ * privateExponent INTEGER, -- d
+ * prime1 INTEGER, -- p
+ * prime2 INTEGER, -- q
+ * exponent1 INTEGER, -- d mod (p-1)
+ * exponent2 INTEGER, -- d mod (q-1)
+ * coefficient INTEGER, -- (inverse of q) mod p
+ * otherPrimeInfos OtherPrimeInfos OPTIONAL
+ * }
+ */
+ if( ( ret = asn1_get_tag( &p, end, &len,
+ ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ) != 0 )
+ {
+ return( POLARSSL_ERR_PK_KEY_INVALID_FORMAT + ret );
+ }
+
+ end = p + len;
+
+ if( ( ret = asn1_get_int( &p, end, &rsa->ver ) ) != 0 )
+ {
+ return( POLARSSL_ERR_PK_KEY_INVALID_FORMAT + ret );
+ }
+
+ if( rsa->ver != 0 )
+ {
+ return( POLARSSL_ERR_PK_KEY_INVALID_VERSION );
+ }
+
+ if( ( ret = asn1_get_mpi( &p, end, &rsa->N ) ) != 0 ||
+ ( ret = asn1_get_mpi( &p, end, &rsa->E ) ) != 0 ||
+ ( ret = asn1_get_mpi( &p, end, &rsa->D ) ) != 0 ||
+ ( ret = asn1_get_mpi( &p, end, &rsa->P ) ) != 0 ||
+ ( ret = asn1_get_mpi( &p, end, &rsa->Q ) ) != 0 ||
+ ( ret = asn1_get_mpi( &p, end, &rsa->DP ) ) != 0 ||
+ ( ret = asn1_get_mpi( &p, end, &rsa->DQ ) ) != 0 ||
+ ( ret = asn1_get_mpi( &p, end, &rsa->QP ) ) != 0 )
+ {
+ rsa_free( rsa );
+ return( POLARSSL_ERR_PK_KEY_INVALID_FORMAT + ret );
+ }
+
+ rsa->len = mpi_size( &rsa->N );
+
+ if( p != end )
+ {
+ rsa_free( rsa );
+ return( POLARSSL_ERR_PK_KEY_INVALID_FORMAT +
+ POLARSSL_ERR_ASN1_LENGTH_MISMATCH );
+ }
+
+ if( ( ret = rsa_check_privkey( rsa ) ) != 0 )
+ {
+ rsa_free( rsa );
+ return( ret );
+ }
+
+ return( 0 );
+}
+#endif /* POLARSSL_RSA_C */
+
+#if defined(POLARSSL_ECP_C)
+/*
+ * Parse a SEC1 encoded private EC key
+ */
+static int pk_parse_key_sec1_der( ecp_keypair *eck,
+ const unsigned char *key,
+ size_t keylen )
+{
+ int ret;
+ int version, pubkey_done;
+ size_t len;
+ asn1_buf params;
+ unsigned char *p = (unsigned char *) key;
+ unsigned char *end = p + keylen;
+ unsigned char *end2;
+
+ /*
+ * RFC 5915, or SEC1 Appendix C.4
+ *
+ * ECPrivateKey ::= SEQUENCE {
+ * version INTEGER { ecPrivkeyVer1(1) } (ecPrivkeyVer1),
+ * privateKey OCTET STRING,
+ * parameters [0] ECParameters {{ NamedCurve }} OPTIONAL,
+ * publicKey [1] BIT STRING OPTIONAL
+ * }
+ */
+ if( ( ret = asn1_get_tag( &p, end, &len,
+ ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ) != 0 )
+ {
+ return( POLARSSL_ERR_PK_KEY_INVALID_FORMAT + ret );
+ }
+
+ end = p + len;
+
+ if( ( ret = asn1_get_int( &p, end, &version ) ) != 0 )
+ return( POLARSSL_ERR_PK_KEY_INVALID_FORMAT + ret );
+
+ if( version != 1 )
+ return( POLARSSL_ERR_PK_KEY_INVALID_VERSION );
+
+ if( ( ret = asn1_get_tag( &p, end, &len, ASN1_OCTET_STRING ) ) != 0 )
+ return( POLARSSL_ERR_PK_KEY_INVALID_FORMAT + ret );
+
+ if( ( ret = mpi_read_binary( &eck->d, p, len ) ) != 0 )
+ {
+ ecp_keypair_free( eck );
+ return( POLARSSL_ERR_PK_KEY_INVALID_FORMAT + ret );
+ }
+
+ p += len;
+
+ /*
+ * Is 'parameters' present?
+ */
+ if( ( ret = asn1_get_tag( &p, end, &len,
+ ASN1_CONTEXT_SPECIFIC | ASN1_CONSTRUCTED | 0 ) ) == 0 )
+ {
+ if( ( ret = pk_get_ecparams( &p, p + len, ¶ms) ) != 0 ||
+ ( ret = pk_use_ecparams( ¶ms, &eck->grp ) ) != 0 )
+ {
+ ecp_keypair_free( eck );
+ return( ret );
+ }
+ }
+ else if( ret != POLARSSL_ERR_ASN1_UNEXPECTED_TAG )
+ {
+ ecp_keypair_free( eck );
+ return( POLARSSL_ERR_PK_KEY_INVALID_FORMAT + ret );
+ }
+
+ /*
+ * Is 'publickey' present? If not, or if we can't read it (eg because it
+ * is compressed), create it from the private key.
+ */
+ pubkey_done = 0;
+ if( ( ret = asn1_get_tag( &p, end, &len,
+ ASN1_CONTEXT_SPECIFIC | ASN1_CONSTRUCTED | 1 ) ) == 0 )
+ {
+ end2 = p + len;
+
+ if( ( ret = asn1_get_bitstring_null( &p, end2, &len ) ) != 0 )
+ return( POLARSSL_ERR_PK_KEY_INVALID_FORMAT + ret );
+
+ if( p + len != end2 )
+ return( POLARSSL_ERR_PK_KEY_INVALID_FORMAT +
+ POLARSSL_ERR_ASN1_LENGTH_MISMATCH );
+
+ if( ( ret = pk_get_ecpubkey( &p, end2, eck ) ) == 0 )
+ pubkey_done = 1;
+ else
+ {
+ /*
+ * The only acceptable failure mode of pk_get_ecpubkey() above
+ * is if the point format is not recognized.
+ */
+ if( ret != POLARSSL_ERR_ECP_FEATURE_UNAVAILABLE )
+ return( POLARSSL_ERR_PK_KEY_INVALID_FORMAT );
+ }
+ }
+ else if ( ret != POLARSSL_ERR_ASN1_UNEXPECTED_TAG )
+ {
+ ecp_keypair_free( eck );
+ return( POLARSSL_ERR_PK_KEY_INVALID_FORMAT + ret );
+ }
+
+ if( ! pubkey_done &&
+ ( ret = ecp_mul( &eck->grp, &eck->Q, &eck->d, &eck->grp.G,
+ NULL, NULL ) ) != 0 )
+ {
+ ecp_keypair_free( eck );
+ return( POLARSSL_ERR_PK_KEY_INVALID_FORMAT + ret );
+ }
+
+ if( ( ret = ecp_check_privkey( &eck->grp, &eck->d ) ) != 0 )
+ {
+ ecp_keypair_free( eck );
+ return( ret );
+ }
+
+ return 0;
+}
+#endif /* POLARSSL_ECP_C */
+
+/*
+ * Parse an unencrypted PKCS#8 encoded private key
+ */
+static int pk_parse_key_pkcs8_unencrypted_der(
+ pk_context *pk,
+ const unsigned char* key,
+ size_t keylen )
+{
+ int ret, version;
+ size_t len;
+ asn1_buf params;
+ unsigned char *p = (unsigned char *) key;
+ unsigned char *end = p + keylen;
+ pk_type_t pk_alg = POLARSSL_PK_NONE;
+ const pk_info_t *pk_info;
+
+ /*
+ * This function parses the PrivatKeyInfo object (PKCS#8 v1.2 = RFC 5208)
+ *
+ * PrivateKeyInfo ::= SEQUENCE {
+ * version Version,
+ * privateKeyAlgorithm PrivateKeyAlgorithmIdentifier,
+ * privateKey PrivateKey,
+ * attributes [0] IMPLICIT Attributes OPTIONAL }
+ *
+ * Version ::= INTEGER
+ * PrivateKeyAlgorithmIdentifier ::= AlgorithmIdentifier
+ * PrivateKey ::= OCTET STRING
+ *
+ * The PrivateKey OCTET STRING is a SEC1 ECPrivateKey
+ */
+
+ if( ( ret = asn1_get_tag( &p, end, &len,
+ ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ) != 0 )
+ {
+ return( POLARSSL_ERR_PK_KEY_INVALID_FORMAT + ret );
+ }
+
+ end = p + len;
+
+ if( ( ret = asn1_get_int( &p, end, &version ) ) != 0 )
+ return( POLARSSL_ERR_PK_KEY_INVALID_FORMAT + ret );
+
+ if( version != 0 )
+ return( POLARSSL_ERR_PK_KEY_INVALID_VERSION + ret );
+
+ if( ( ret = pk_get_pk_alg( &p, end, &pk_alg, ¶ms ) ) != 0 )
+ return( POLARSSL_ERR_PK_KEY_INVALID_FORMAT + ret );
+
+ if( ( ret = asn1_get_tag( &p, end, &len, ASN1_OCTET_STRING ) ) != 0 )
+ return( POLARSSL_ERR_PK_KEY_INVALID_FORMAT + ret );
+
+ if( len < 1 )
+ return( POLARSSL_ERR_PK_KEY_INVALID_FORMAT +
+ POLARSSL_ERR_ASN1_OUT_OF_DATA );
+
+ if( ( pk_info = pk_info_from_type( pk_alg ) ) == NULL )
+ return( POLARSSL_ERR_PK_UNKNOWN_PK_ALG );
+
+ if( ( ret = pk_init_ctx( pk, pk_info ) ) != 0 )
+ return( ret );
+
+#if defined(POLARSSL_RSA_C)
+ if( pk_alg == POLARSSL_PK_RSA )
+ {
+ if( ( ret = pk_parse_key_pkcs1_der( pk_rsa( *pk ), p, len ) ) != 0 )
+ {
+ pk_free( pk );
+ return( ret );
+ }
+ } else
+#endif /* POLARSSL_RSA_C */
+#if defined(POLARSSL_ECP_C)
+ if( pk_alg == POLARSSL_PK_ECKEY || pk_alg == POLARSSL_PK_ECKEY_DH )
+ {
+ if( ( ret = pk_use_ecparams( ¶ms, &pk_ec( *pk )->grp ) ) != 0 ||
+ ( ret = pk_parse_key_sec1_der( pk_ec( *pk ), p, len ) ) != 0 )
+ {
+ pk_free( pk );
+ return( ret );
+ }
+ } else
+#endif /* POLARSSL_ECP_C */
+ return( POLARSSL_ERR_PK_UNKNOWN_PK_ALG );
+
+ return 0;
+}
+
+/*
+ * Parse an encrypted PKCS#8 encoded private key
+ */
+static int pk_parse_key_pkcs8_encrypted_der(
+ pk_context *pk,
+ const unsigned char *key, size_t keylen,
+ const unsigned char *pwd, size_t pwdlen )
+{
+ int ret, decrypted = 0;
+ size_t len;
+ unsigned char buf[2048];
+ unsigned char *p, *end;
+ asn1_buf pbe_alg_oid, pbe_params;
+#if defined(POLARSSL_PKCS12_C)
+ cipher_type_t cipher_alg;
+ md_type_t md_alg;
+#endif
+
+ memset( buf, 0, sizeof( buf ) );
+
+ p = (unsigned char *) key;
+ end = p + keylen;
+
+ if( pwdlen == 0 )
+ return( POLARSSL_ERR_PK_PASSWORD_REQUIRED );
+
+ /*
+ * This function parses the EncryptedPrivatKeyInfo object (PKCS#8)
+ *
+ * EncryptedPrivateKeyInfo ::= SEQUENCE {
+ * encryptionAlgorithm EncryptionAlgorithmIdentifier,
+ * encryptedData EncryptedData
+ * }
+ *
+ * EncryptionAlgorithmIdentifier ::= AlgorithmIdentifier
+ *
+ * EncryptedData ::= OCTET STRING
+ *
+ * The EncryptedData OCTET STRING is a PKCS#8 PrivateKeyInfo
+ */
+ if( ( ret = asn1_get_tag( &p, end, &len,
+ ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ) != 0 )
+ {
+ return( POLARSSL_ERR_PK_KEY_INVALID_FORMAT + ret );
+ }
+
+ end = p + len;
+
+ if( ( ret = asn1_get_alg( &p, end, &pbe_alg_oid, &pbe_params ) ) != 0 )
+ return( POLARSSL_ERR_PK_KEY_INVALID_FORMAT + ret );
+
+ if( ( ret = asn1_get_tag( &p, end, &len, ASN1_OCTET_STRING ) ) != 0 )
+ return( POLARSSL_ERR_PK_KEY_INVALID_FORMAT + ret );
+
+ if( len > sizeof( buf ) )
+ return( POLARSSL_ERR_PK_BAD_INPUT_DATA );
+
+ /*
+ * Decrypt EncryptedData with appropriate PDE
+ */
+#if defined(POLARSSL_PKCS12_C)
+ if( oid_get_pkcs12_pbe_alg( &pbe_alg_oid, &md_alg, &cipher_alg ) == 0 )
+ {
+ if( ( ret = pkcs12_pbe( &pbe_params, PKCS12_PBE_DECRYPT,
+ cipher_alg, md_alg,
+ pwd, pwdlen, p, len, buf ) ) != 0 )
+ {
+ if( ret == POLARSSL_ERR_PKCS12_PASSWORD_MISMATCH )
+ return( POLARSSL_ERR_PK_PASSWORD_MISMATCH );
+
+ return( ret );
+ }
+
+ decrypted = 1;
+ }
+ else if( OID_CMP( OID_PKCS12_PBE_SHA1_RC4_128, &pbe_alg_oid ) )
+ {
+ if( ( ret = pkcs12_pbe_sha1_rc4_128( &pbe_params,
+ PKCS12_PBE_DECRYPT,
+ pwd, pwdlen,
+ p, len, buf ) ) != 0 )
+ {
+ 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_PK_PASSWORD_MISMATCH );
+
+ decrypted = 1;
+ }
+ else
+#endif /* POLARSSL_PKCS12_C */
+#if defined(POLARSSL_PKCS5_C)
+ if( OID_CMP( OID_PKCS5_PBES2, &pbe_alg_oid ) )
+ {
+ if( ( ret = pkcs5_pbes2( &pbe_params, PKCS5_DECRYPT, pwd, pwdlen,
+ p, len, buf ) ) != 0 )
+ {
+ if( ret == POLARSSL_ERR_PKCS5_PASSWORD_MISMATCH )
+ return( POLARSSL_ERR_PK_PASSWORD_MISMATCH );
+
+ return( ret );
+ }
+
+ decrypted = 1;
+ }
+ else
+#endif /* POLARSSL_PKCS5_C */
+ {
+ ((void) pwd);
+ }
+
+ if( decrypted == 0 )
+ return( POLARSSL_ERR_PK_FEATURE_UNAVAILABLE );
+
+ return( pk_parse_key_pkcs8_unencrypted_der( pk, buf, len ) );
+}
+
+/*
+ * Parse a private key
+ */
+int pk_parse_key( pk_context *pk,
+ const unsigned char *key, size_t keylen,
+ const unsigned char *pwd, size_t pwdlen )
+{
+ int ret;
+ const pk_info_t *pk_info;
+
+#if defined(POLARSSL_PEM_PARSE_C)
+ size_t len;
+ pem_context pem;
+
+ pem_init( &pem );
+
+#if defined(POLARSSL_RSA_C)
+ ret = pem_read_buffer( &pem,
+ "-----BEGIN RSA PRIVATE KEY-----",
+ "-----END RSA PRIVATE KEY-----",
+ key, pwd, pwdlen, &len );
+ if( ret == 0 )
+ {
+ if( ( pk_info = pk_info_from_type( POLARSSL_PK_RSA ) ) == NULL )
+ return( POLARSSL_ERR_PK_UNKNOWN_PK_ALG );
+
+ if( ( ret = pk_init_ctx( pk, pk_info ) ) != 0 ||
+ ( ret = pk_parse_key_pkcs1_der( pk_rsa( *pk ),
+ pem.buf, pem.buflen ) ) != 0 )
+ {
+ pk_free( pk );
+ }
+
+ pem_free( &pem );
+ return( ret );
+ }
+ else if( ret == POLARSSL_ERR_PEM_PASSWORD_MISMATCH )
+ return( POLARSSL_ERR_PK_PASSWORD_MISMATCH );
+ else if( ret == POLARSSL_ERR_PEM_PASSWORD_REQUIRED )
+ return( POLARSSL_ERR_PK_PASSWORD_REQUIRED );
+ else if( ret != POLARSSL_ERR_PEM_NO_HEADER_FOOTER_PRESENT )
+ return( ret );
+#endif /* POLARSSL_RSA_C */
+
+#if defined(POLARSSL_ECP_C)
+ ret = pem_read_buffer( &pem,
+ "-----BEGIN EC PRIVATE KEY-----",
+ "-----END EC PRIVATE KEY-----",
+ key, pwd, pwdlen, &len );
+ if( ret == 0 )
+ {
+ if( ( pk_info = pk_info_from_type( POLARSSL_PK_ECKEY ) ) == NULL )
+ return( POLARSSL_ERR_PK_UNKNOWN_PK_ALG );
+
+ if( ( ret = pk_init_ctx( pk, pk_info ) ) != 0 ||
+ ( ret = pk_parse_key_sec1_der( pk_ec( *pk ),
+ pem.buf, pem.buflen ) ) != 0 )
+ {
+ pk_free( pk );
+ }
+
+ pem_free( &pem );
+ return( ret );
+ }
+ else if( ret == POLARSSL_ERR_PEM_PASSWORD_MISMATCH )
+ return( POLARSSL_ERR_PK_PASSWORD_MISMATCH );
+ else if( ret == POLARSSL_ERR_PEM_PASSWORD_REQUIRED )
+ return( POLARSSL_ERR_PK_PASSWORD_REQUIRED );
+ else if( ret != POLARSSL_ERR_PEM_NO_HEADER_FOOTER_PRESENT )
+ return( ret );
+#endif /* POLARSSL_ECP_C */
+
+ ret = pem_read_buffer( &pem,
+ "-----BEGIN PRIVATE KEY-----",
+ "-----END PRIVATE KEY-----",
+ key, NULL, 0, &len );
+ if( ret == 0 )
+ {
+ if( ( ret = pk_parse_key_pkcs8_unencrypted_der( pk,
+ pem.buf, pem.buflen ) ) != 0 )
+ {
+ pk_free( pk );
+ }
+
+ pem_free( &pem );
+ return( ret );
+ }
+ else if( ret != POLARSSL_ERR_PEM_NO_HEADER_FOOTER_PRESENT )
+ return( ret );
+
+ ret = pem_read_buffer( &pem,
+ "-----BEGIN ENCRYPTED PRIVATE KEY-----",
+ "-----END ENCRYPTED PRIVATE KEY-----",
+ key, NULL, 0, &len );
+ if( ret == 0 )
+ {
+ if( ( ret = pk_parse_key_pkcs8_encrypted_der( pk,
+ pem.buf, pem.buflen,
+ pwd, pwdlen ) ) != 0 )
+ {
+ pk_free( pk );
+ }
+
+ pem_free( &pem );
+ return( ret );
+ }
+ else if( ret != POLARSSL_ERR_PEM_NO_HEADER_FOOTER_PRESENT )
+ return( ret );
+#else
+ ((void) pwd);
+ ((void) pwdlen);
+#endif /* POLARSSL_PEM_PARSE_C */
+
+ /*
+ * At this point we only know it's not a PEM formatted key. Could be any
+ * of the known DER encoded private key formats
+ *
+ * We try the different DER format parsers to see if one passes without
+ * error
+ */
+ if( ( ret = pk_parse_key_pkcs8_encrypted_der( pk, key, keylen,
+ pwd, pwdlen ) ) == 0 )
+ {
+ return( 0 );
+ }
+
+ pk_free( pk );
+
+ if( ret == POLARSSL_ERR_PK_PASSWORD_MISMATCH )
+ {
+ return( ret );
+ }
+
+ if( ( ret = pk_parse_key_pkcs8_unencrypted_der( pk, key, keylen ) ) == 0 )
+ return( 0 );
+
+ pk_free( pk );
+
+#if defined(POLARSSL_RSA_C)
+ if( ( pk_info = pk_info_from_type( POLARSSL_PK_RSA ) ) == NULL )
+ return( POLARSSL_ERR_PK_UNKNOWN_PK_ALG );
+
+ if( ( ret = pk_init_ctx( pk, pk_info ) ) != 0 ||
+ ( ret = pk_parse_key_pkcs1_der( pk_rsa( *pk ), key, keylen ) ) == 0 )
+ {
+ return( 0 );
+ }
+
+ pk_free( pk );
+#endif /* POLARSSL_RSA_C */
+
+#if defined(POLARSSL_ECP_C)
+ if( ( pk_info = pk_info_from_type( POLARSSL_PK_ECKEY ) ) == NULL )
+ return( POLARSSL_ERR_PK_UNKNOWN_PK_ALG );
+
+ if( ( ret = pk_init_ctx( pk, pk_info ) ) != 0 ||
+ ( ret = pk_parse_key_sec1_der( pk_ec( *pk ), key, keylen ) ) == 0 )
+ {
+ return( 0 );
+ }
+
+ pk_free( pk );
+#endif /* POLARSSL_ECP_C */
+
+ return( POLARSSL_ERR_PK_KEY_INVALID_FORMAT );
+}
+
+/*
+ * Parse a public key
+ */
+int pk_parse_public_key( pk_context *ctx,
+ const unsigned char *key, size_t keylen )
+{
+ int ret;
+ unsigned char *p;
+#if defined(POLARSSL_PEM_PARSE_C)
+ size_t len;
+ pem_context pem;
+
+ pem_init( &pem );
+ ret = pem_read_buffer( &pem,
+ "-----BEGIN PUBLIC KEY-----",
+ "-----END PUBLIC KEY-----",
+ key, NULL, 0, &len );
+
+ if( ret == 0 )
+ {
+ /*
+ * Was PEM encoded
+ */
+ key = pem.buf;
+ keylen = pem.buflen;
+ }
+ else if( ret != POLARSSL_ERR_PEM_NO_HEADER_FOOTER_PRESENT )
+ {
+ pem_free( &pem );
+ return( ret );
+ }
+#endif /* POLARSSL_PEM_PARSE_C */
+ p = (unsigned char *) key;
+
+ ret = pk_parse_subpubkey( &p, p + keylen, ctx );
+
+#if defined(POLARSSL_PEM_PARSE_C)
+ pem_free( &pem );
+#endif
+
+ return( ret );
+}
+
+#endif /* POLARSSL_PK_PARSE_C */
+
+