/* $OpenBSD: rsa_pk1.c,v 1.14 2014/10/22 13:02:04 jsing Exp $ */ /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) * All rights reserved. * * This package is an SSL implementation written * by Eric Young (eay@cryptsoft.com). * The implementation was written so as to conform with Netscapes SSL. * * This library is free for commercial and non-commercial use as long as * the following conditions are aheared to. The following conditions * apply to all code found in this distribution, be it the RC4, RSA, * lhash, DES, etc., code; not just the SSL code. The SSL documentation * included with this distribution is covered by the same copyright terms * except that the holder is Tim Hudson (tjh@cryptsoft.com). * * Copyright remains Eric Young's, and as such any Copyright notices in * the code are not to be removed. * If this package is used in a product, Eric Young should be given attribution * as the author of the parts of the library used. * This can be in the form of a textual message at program startup or * in documentation (online or textual) provided with the package. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * "This product includes cryptographic software written by * Eric Young (eay@cryptsoft.com)" * The word 'cryptographic' can be left out if the rouines from the library * being used are not cryptographic related :-). * 4. If you include any Windows specific code (or a derivative thereof) from * the apps directory (application code) you must include an acknowledgement: * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" * * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * The licence and distribution terms for any publically available version or * derivative of this code cannot be changed. i.e. this code cannot simply be * copied and put under another distribution licence * [including the GNU Public Licence.] */ #include #include #include #include #include #include int RSA_padding_add_PKCS1_type_1(unsigned char *to, int tlen, const unsigned char *from, int flen) { int j; unsigned char *p; if (flen > (tlen - RSA_PKCS1_PADDING_SIZE)) { RSAerr(RSA_F_RSA_PADDING_ADD_PKCS1_TYPE_1, RSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE); return 0; } p = (unsigned char *)to; *(p++) = 0; *(p++) = 1; /* Private Key BT (Block Type) */ /* pad out with 0xff data */ j = tlen - 3 - flen; memset(p, 0xff, j); p += j; *(p++) = '\0'; memcpy(p, from, flen); return 1; } int RSA_padding_check_PKCS1_type_1(unsigned char *to, int tlen, const unsigned char *from, int flen, int num) { int i, j; const unsigned char *p; p = from; if (num != flen + 1 || *(p++) != 01) { RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_1, RSA_R_BLOCK_TYPE_IS_NOT_01); return -1; } /* scan over padding data */ j = flen - 1; /* one for type. */ for (i = 0; i < j; i++) { if (*p != 0xff) { /* should decrypt to 0xff */ if (*p == 0) { p++; break; } else { RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_1, RSA_R_BAD_FIXED_HEADER_DECRYPT); return -1; } } p++; } if (i == j) { RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_1, RSA_R_NULL_BEFORE_BLOCK_MISSING); return -1; } if (i < 8) { RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_1, RSA_R_BAD_PAD_BYTE_COUNT); return -1; } i++; /* Skip over the '\0' */ j -= i; if (j > tlen) { RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_1, RSA_R_DATA_TOO_LARGE); return -1; } memcpy(to, p, j); return j; } int RSA_padding_add_PKCS1_type_2(unsigned char *to, int tlen, const unsigned char *from, int flen) { int i, j; unsigned char *p; if (flen > tlen - 11) { RSAerr(RSA_F_RSA_PADDING_ADD_PKCS1_TYPE_2, RSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE); return 0; } p = (unsigned char *)to; *(p++) = 0; *(p++) = 2; /* Public Key BT (Block Type) */ /* pad out with non-zero random data */ j = tlen - 3 - flen; arc4random_buf(p, j); for (i = 0; i < j; i++) { while (*p == '\0') arc4random_buf(p, 1); p++; } *(p++) = '\0'; memcpy(p, from, flen); return 1; } int RSA_padding_check_PKCS1_type_2(unsigned char *to, int tlen, const unsigned char *from, int flen, int num) { int i, j; const unsigned char *p; p = from; if (num != flen + 1 || *(p++) != 02) { RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_2, RSA_R_BLOCK_TYPE_IS_NOT_02); return -1; } /* scan over padding data */ j = flen - 1; /* one for type. */ for (i = 0; i < j; i++) if (*(p++) == 0) break; if (i == j) { RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_2, RSA_R_NULL_BEFORE_BLOCK_MISSING); return -1; } if (i < 8) { RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_2, RSA_R_BAD_PAD_BYTE_COUNT); return -1; } i++; /* Skip over the '\0' */ j -= i; if (j > tlen) { RSAerr(RSA_F_RSA_PADDING_CHECK_PKCS1_TYPE_2, RSA_R_DATA_TOO_LARGE); return -1; } memcpy(to, p, j); return j; }