code / widevine-mirrored-source / 66427ffa50c9a1038998509907e91d0be9ced12a / . / openssl-1.0.0a / crypto / rsa / rsa_ssl.c

/* crypto/rsa/rsa_ssl.c */ | |

/* 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 <stdio.h> | |

#include "cryptlib.h" | |

#include <openssl/bn.h> | |

#include <openssl/rsa.h> | |

#include <openssl/rand.h> | |

int RSA_padding_add_SSLv23(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_SSLV23,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-3-8-flen; | |

if (RAND_bytes(p,j) <= 0) | |

return(0); | |

for (i=0; i<j; i++) | |

{ | |

if (*p == '\0') | |

do { | |

if (RAND_bytes(p,1) <= 0) | |

return(0); | |

} while (*p == '\0'); | |

p++; | |

} | |

memset(p,3,8); | |

p+=8; | |

*(p++)='\0'; | |

memcpy(p,from,(unsigned int)flen); | |

return(1); | |

} | |

int RSA_padding_check_SSLv23(unsigned char *to, int tlen, | |

const unsigned char *from, int flen, int num) | |

{ | |

int i,j,k; | |

const unsigned char *p; | |

p=from; | |

if (flen < 10) | |

{ | |

RSAerr(RSA_F_RSA_PADDING_CHECK_SSLV23,RSA_R_DATA_TOO_SMALL); | |

return(-1); | |

} | |

if ((num != (flen+1)) || (*(p++) != 02)) | |

{ | |

RSAerr(RSA_F_RSA_PADDING_CHECK_SSLV23,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) || (i < 8)) | |

{ | |

RSAerr(RSA_F_RSA_PADDING_CHECK_SSLV23,RSA_R_NULL_BEFORE_BLOCK_MISSING); | |

return(-1); | |

} | |

for (k = -9; k<-1; k++) | |

{ | |

if (p[k] != 0x03) break; | |

} | |

if (k == -1) | |

{ | |

RSAerr(RSA_F_RSA_PADDING_CHECK_SSLV23,RSA_R_SSLV3_ROLLBACK_ATTACK); | |

return(-1); | |

} | |

i++; /* Skip over the '\0' */ | |

j-=i; | |

if (j > tlen) | |

{ | |

RSAerr(RSA_F_RSA_PADDING_CHECK_SSLV23,RSA_R_DATA_TOO_LARGE); | |

return(-1); | |

} | |

memcpy(to,p,(unsigned int)j); | |

return(j); | |

} | |