334 lines
10 KiB
C
334 lines
10 KiB
C
/*
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* pkcs15-sec.c: PKCS#15 cryptography functions
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*
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* Copyright (C) 2001, 2002 Juha Yrjölä <juha.yrjola@iki.fi>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "internal.h"
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#include "pkcs15.h"
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#include "log.h"
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#include <assert.h>
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#include <string.h>
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#include <stdlib.h>
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#include <stdio.h>
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#ifndef _WIN32
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#include <unistd.h>
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#endif
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static int pkcs1_strip_padding(u8 *data, size_t len)
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{
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unsigned int n = 0;
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if (data[0] != 0x00 && data[1] != 0x02)
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return SC_ERROR_DECRYPT_FAILED;
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/* Skip over padding bytes */
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for (n = 2; n < len && data[n]; n++)
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;
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/* Must be at least 8 pad bytes */
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if (n >= len || n < 10)
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return SC_ERROR_DECRYPT_FAILED;
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n++;
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/* Now move decrypted contents to head of buffer */
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memmove(data, data + n, len - n);
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return len - n;
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}
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int sc_pkcs15_decipher(struct sc_pkcs15_card *p15card,
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const struct sc_pkcs15_object *obj,
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unsigned long flags,
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const u8 * in, size_t inlen, u8 *out, size_t outlen)
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{
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int r;
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struct sc_algorithm_info *alg_info;
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struct sc_security_env senv;
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struct sc_context *ctx = p15card->card->ctx;
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struct sc_path path, file_id;
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const struct sc_pkcs15_prkey_info *prkey = (const struct sc_pkcs15_prkey_info *) obj->data;
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unsigned long pad_flags = 0;
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/* If the key is extractable, the caller should extract the
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* key and do the crypto himself */
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if (!prkey->native)
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return SC_ERROR_EXTRACTABLE_KEY;
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if (prkey->path.len < 2)
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return SC_ERROR_INVALID_ARGUMENTS;
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if (prkey->path.len == 2) {
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path = p15card->file_app->path;
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file_id = prkey->path;
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} else {
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path = prkey->path;
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memcpy(file_id.value, prkey->path.value + prkey->path.len - 2, 2);
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file_id.len = 2;
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path.len -= 2;
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}
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alg_info = _sc_card_find_rsa_alg(p15card->card, prkey->modulus_length);
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if (alg_info == NULL) {
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error(ctx, "Card does not support RSA with key length %d\n", prkey->modulus_length);
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return SC_ERROR_NOT_SUPPORTED;
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}
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senv.algorithm = SC_ALGORITHM_RSA;
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senv.algorithm_flags = 0;
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if (flags & SC_ALGORITHM_RSA_PAD_PKCS1) {
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if (!(alg_info->flags & SC_ALGORITHM_RSA_PAD_PKCS1))
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pad_flags |= SC_ALGORITHM_RSA_PAD_PKCS1;
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else
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senv.algorithm_flags |= SC_ALGORITHM_RSA_PAD_PKCS1;
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} else if ((flags & SC_ALGORITHM_RSA_PAD_ANSI) ||
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(flags & SC_ALGORITHM_RSA_PAD_ISO9796)) {
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error(ctx, "Only PKCS #1 padding method supported\n");
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return SC_ERROR_NOT_SUPPORTED;
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} else {
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if (!(alg_info->flags & SC_ALGORITHM_RSA_RAW)) {
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error(ctx, "Card requires RSA padding\n");
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return SC_ERROR_NOT_SUPPORTED;
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}
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senv.algorithm_flags |= SC_ALGORITHM_RSA_RAW;
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}
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senv.file_ref = file_id;
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senv.operation = SC_SEC_OPERATION_DECIPHER;
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senv.key_ref_len = 1;
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senv.key_ref[0] = prkey->key_reference & 0xFF;
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senv.flags = SC_SEC_ENV_KEY_REF_PRESENT | SC_SEC_ENV_FILE_REF_PRESENT;
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senv.flags |= SC_SEC_ENV_ALG_PRESENT;
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SC_FUNC_CALLED(ctx, 1);
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r = sc_select_file(p15card->card, &path, NULL);
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SC_TEST_RET(ctx, r, "sc_select_file() failed");
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#if 0
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/* FIXME! */
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r = sc_restore_security_env(p15card->card, 0); /* empty SE */
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SC_TEST_RET(ctx, r, "sc_restore_security_env() failed");
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#endif
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r = sc_set_security_env(p15card->card, &senv, 0);
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SC_TEST_RET(ctx, r, "sc_set_security_env() failed");
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r = sc_decipher(p15card->card, in, inlen, out, outlen);
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SC_TEST_RET(ctx, r, "sc_decipher() failed");
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/* Strip any padding */
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if (pad_flags & SC_ALGORITHM_RSA_PAD_PKCS1) {
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r = pkcs1_strip_padding(out, r);
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SC_TEST_RET(ctx, r, "Invalid PKCS#1 padding");
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}
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return r;
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}
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static int pkcs1_add_padding(const u8 *in, size_t inlen, u8 *out, size_t outlen)
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{
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int i;
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if (inlen + 11 > outlen)
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return SC_ERROR_INVALID_ARGUMENTS;
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*out++ = 0x00;
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*out++ = 0x01;
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i = outlen - 3 - inlen;
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memset(out, 0xFF, i);
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out += i;
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*out++ = 0x00;
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memcpy(out, in, inlen);
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return 0;
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}
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static int add_padding(struct sc_context *ctx, const u8 *in, size_t inlen, u8 *out,
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size_t *outlen, unsigned long flags, unsigned int mod_length)
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{
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u8 buf[64];
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size_t buflen;
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const u8 *hdr_md5 = (const u8 *) "\x30\x20\x30\x0c\x06\x08\x2a\x86\x48\x86\xf7\x0d\x02\x05\x05\x00\x04\x10";
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size_t hdr_md5_len = 18;
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const u8 *hdr_sha1 = (const u8 *) "\x30\x21\x30\x09\x06\x05\x2b\x0e\x03\x02\x1a\x05\x00\x04\x10";
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size_t hdr_sha1_len = 15;
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if (flags & SC_ALGORITHM_RSA_HASH_SHA1) {
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if (inlen != 20)
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return SC_ERROR_WRONG_LENGTH;
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memcpy(buf, hdr_sha1, hdr_sha1_len);
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memcpy(buf + hdr_sha1_len, in, 20);
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buflen = 20 + hdr_sha1_len;
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} else if (flags & SC_ALGORITHM_RSA_HASH_MD5) {
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if (inlen != 16)
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return SC_ERROR_WRONG_LENGTH;
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memcpy(buf, hdr_md5, hdr_md5_len);
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memcpy(buf + hdr_md5_len, in, 16);
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buflen = 16 + hdr_md5_len;
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} else if (flags & SC_ALGORITHM_RSA_HASH_MD5_SHA1) {
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if (inlen != 36)
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return SC_ERROR_WRONG_LENGTH;
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memcpy(buf, in, 36);
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buflen = 36;
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} else
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buflen = 0;
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if (buflen) {
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in = buf;
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inlen = buflen;
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}
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if (flags & SC_ALGORITHM_RSA_PAD_PKCS1) {
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int r;
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if (*outlen < mod_length)
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return SC_ERROR_BUFFER_TOO_SMALL;
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r = pkcs1_add_padding(in, inlen, out, mod_length);
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if (r)
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return r;
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*outlen = mod_length;
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} else {
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if (*outlen < inlen)
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return SC_ERROR_BUFFER_TOO_SMALL;
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memcpy(out, in, inlen);
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*outlen = inlen;
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}
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if (buflen)
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memset(buf, 0, buflen);
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return 0;
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}
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int sc_pkcs15_compute_signature(struct sc_pkcs15_card *p15card,
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const struct sc_pkcs15_object *obj,
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unsigned long flags, const u8 *in, size_t inlen,
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u8 *out, size_t outlen)
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{
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int r;
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struct sc_security_env senv;
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struct sc_context *ctx = p15card->card->ctx;
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struct sc_algorithm_info *alg_info;
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const struct sc_pkcs15_prkey_info *prkey = (const struct sc_pkcs15_prkey_info *) obj->data;
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u8 buf[512];
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size_t buflen;
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struct sc_path path, file_id;
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unsigned long pad_flags = 0;
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/* If the key is extractable, the caller should extract the
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* key and do the crypto himself */
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if (!prkey->native)
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return SC_ERROR_EXTRACTABLE_KEY;
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if (prkey->path.len < 2)
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return SC_ERROR_INVALID_ARGUMENTS;
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if (prkey->path.len == 2) {
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path = p15card->file_app->path;
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file_id = prkey->path;
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} else {
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path = prkey->path;
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memcpy(file_id.value, prkey->path.value + prkey->path.len - 2, 2);
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file_id.len = 2;
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path.len -= 2;
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}
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alg_info = _sc_card_find_rsa_alg(p15card->card, prkey->modulus_length);
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if (alg_info == NULL) {
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error(ctx, "Card does not support RSA with key length %d\n", prkey->modulus_length);
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return SC_ERROR_NOT_SUPPORTED;
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}
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senv.algorithm = SC_ALGORITHM_RSA;
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/* Probably never happens, but better make sure */
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if (inlen > sizeof(buf))
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return SC_ERROR_BUFFER_TOO_SMALL;
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memcpy(buf, in, inlen);
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senv.algorithm_flags = 0;
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if (flags & SC_ALGORITHM_RSA_HASH_SHA1) {
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if (inlen != 20)
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SC_FUNC_RETURN(ctx, 0, SC_ERROR_WRONG_LENGTH);
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if (!(alg_info->flags & SC_ALGORITHM_RSA_HASH_SHA1))
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pad_flags |= SC_ALGORITHM_RSA_HASH_SHA1;
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else
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senv.algorithm_flags |= SC_ALGORITHM_RSA_HASH_SHA1;
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} else if (flags & SC_ALGORITHM_RSA_HASH_MD5) {
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if (inlen != 16)
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SC_FUNC_RETURN(ctx, 0, SC_ERROR_WRONG_LENGTH);
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if (!(alg_info->flags & SC_ALGORITHM_RSA_HASH_MD5))
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pad_flags |= SC_ALGORITHM_RSA_HASH_MD5;
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else
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senv.algorithm_flags |= SC_ALGORITHM_RSA_HASH_MD5;
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} else if (flags & SC_ALGORITHM_RSA_HASH_MD5_SHA1) {
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if (inlen != 36)
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SC_FUNC_RETURN(ctx, 0, SC_ERROR_WRONG_LENGTH);
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if (!(alg_info->flags & SC_ALGORITHM_RSA_HASH_MD5_SHA1))
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pad_flags |= SC_ALGORITHM_RSA_HASH_MD5_SHA1;
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else
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senv.algorithm_flags |= SC_ALGORITHM_RSA_HASH_MD5_SHA1;
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} else {
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if (!(alg_info->flags & SC_ALGORITHM_RSA_HASH_NONE)) {
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error(ctx, "Raw RSA not supported\n");
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return SC_ERROR_NOT_SUPPORTED;
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}
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senv.algorithm_flags |= SC_ALGORITHM_RSA_HASH_NONE;
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}
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if (flags & SC_ALGORITHM_RSA_PAD_PKCS1) {
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if (!(alg_info->flags & SC_ALGORITHM_RSA_PAD_PKCS1))
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pad_flags |= SC_ALGORITHM_RSA_PAD_PKCS1;
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else
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senv.algorithm_flags |= SC_ALGORITHM_RSA_PAD_PKCS1;
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} else if ((flags & SC_ALGORITHM_RSA_PAD_ANSI) ||
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(flags & SC_ALGORITHM_RSA_PAD_ISO9796)) {
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error(ctx, "Only PKCS #1 padding method supported\n");
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return SC_ERROR_NOT_SUPPORTED;
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} else {
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if (!(alg_info->flags & SC_ALGORITHM_RSA_RAW)) {
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error(ctx, "Card requires RSA padding\n");
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return SC_ERROR_NOT_SUPPORTED;
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}
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senv.algorithm_flags |= SC_ALGORITHM_RSA_RAW;
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}
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if (pad_flags) {
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buflen = sizeof(buf);
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r = add_padding(ctx, in, inlen, buf, &buflen, pad_flags,
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prkey->modulus_length/8);
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SC_TEST_RET(ctx, r, "Unable to add padding");
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in = buf;
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inlen = buflen;
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}
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senv.file_ref = file_id;
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senv.operation = SC_SEC_OPERATION_SIGN;
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senv.key_ref_len = 1;
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senv.key_ref[0] = prkey->key_reference & 0xFF;
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senv.flags = SC_SEC_ENV_KEY_REF_PRESENT | SC_SEC_ENV_FILE_REF_PRESENT;
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senv.flags |= SC_SEC_ENV_ALG_PRESENT;
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r = sc_select_file(p15card->card, &path, NULL);
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SC_TEST_RET(ctx, r, "sc_select_file() failed");
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#if 0
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/* FIXME! */
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r = sc_restore_security_env(p15card->card, 0); /* empty SE */
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SC_TEST_RET(ctx, r, "sc_restore_security_env() failed");
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#endif
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r = sc_set_security_env(p15card->card, &senv, 0);
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SC_TEST_RET(ctx, r, "sc_set_security_env() failed");
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/* XXX: Should we adjust outlen to match the size of
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* the signature we expect? CardOS for instance will
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* barf if the LE value doesn't match the size of the
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* signature exactly.
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*
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* Right now we work around this by assuming that eToken keys
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* always have algorithm RSA_PURE_SIG so the input buffer
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* is padded and has the same length as the signature. --okir */
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r = sc_compute_signature(p15card->card, in, inlen, out, outlen);
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if (pad_flags)
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memset(buf, 0, inlen);
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SC_TEST_RET(ctx, r, "sc_compute_signature() failed");
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return r;
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}
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