diff options
Diffstat (limited to 'crypto/rsa/rsa_x931.c')
| -rw-r--r-- | crypto/rsa/rsa_x931.c | 200 |
1 files changed, 94 insertions, 106 deletions
diff --git a/crypto/rsa/rsa_x931.c b/crypto/rsa/rsa_x931.c index c8c3b3934a..725ead049c 100644 --- a/crypto/rsa/rsa_x931.c +++ b/crypto/rsa/rsa_x931.c @@ -1,6 +1,7 @@ /* rsa_x931.c */ -/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL - * project 2005. +/* + * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project + * 2005. */ /* ==================================================================== * Copyright (c) 2005 The OpenSSL Project. All rights reserved. @@ -10,7 +11,7 @@ * are met: * * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. + * 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 @@ -56,8 +57,6 @@ * */ - - #include <stdio.h> #include "cryptlib.h" #include <openssl/bn.h> @@ -66,114 +65,103 @@ #include <openssl/objects.h> int RSA_padding_add_X931(unsigned char *to, int tlen, - const unsigned char *from, int flen) - { - int j; - unsigned char *p; - - /* Absolute minimum amount of padding is 1 header nibble, 1 padding - * nibble and 2 trailer bytes: but 1 hash if is already in 'from'. - */ - - j = tlen - flen - 2; - - if (j < 0) - { - RSAerr(RSA_F_RSA_PADDING_ADD_X931,RSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE); - return -1; - } - - p=(unsigned char *)to; - - /* If no padding start and end nibbles are in one byte */ - if (j == 0) - *p++ = 0x6A; - else - { - *p++ = 0x6B; - if (j > 1) - { - memset(p, 0xBB, j - 1); - p += j - 1; - } - *p++ = 0xBA; - } - memcpy(p,from,(unsigned int)flen); - p += flen; - *p = 0xCC; - return(1); - } + const unsigned char *from, int flen) +{ + int j; + unsigned char *p; + + /* + * Absolute minimum amount of padding is 1 header nibble, 1 padding + * nibble and 2 trailer bytes: but 1 hash if is already in 'from'. + */ + + j = tlen - flen - 2; + + if (j < 0) { + RSAerr(RSA_F_RSA_PADDING_ADD_X931, RSA_R_DATA_TOO_LARGE_FOR_KEY_SIZE); + return -1; + } + + p = (unsigned char *)to; + + /* If no padding start and end nibbles are in one byte */ + if (j == 0) + *p++ = 0x6A; + else { + *p++ = 0x6B; + if (j > 1) { + memset(p, 0xBB, j - 1); + p += j - 1; + } + *p++ = 0xBA; + } + memcpy(p, from, (unsigned int)flen); + p += flen; + *p = 0xCC; + return (1); +} int RSA_padding_check_X931(unsigned char *to, int tlen, - const unsigned char *from, int flen, int num) - { - int i = 0,j; - const unsigned char *p; - - p=from; - if ((num != flen) || ((*p != 0x6A) && (*p != 0x6B))) - { - RSAerr(RSA_F_RSA_PADDING_CHECK_X931,RSA_R_INVALID_HEADER); - return -1; - } - - if (*p++ == 0x6B) - { - j=flen-3; - for (i = 0; i < j; i++) - { - unsigned char c = *p++; - if (c == 0xBA) - break; - if (c != 0xBB) - { - RSAerr(RSA_F_RSA_PADDING_CHECK_X931, - RSA_R_INVALID_PADDING); - return -1; - } - } - - j -= i; - - if (i == 0) - { - RSAerr(RSA_F_RSA_PADDING_CHECK_X931, RSA_R_INVALID_PADDING); - return -1; - } - - } - else j = flen - 2; - - if (p[j] != 0xCC) - { - RSAerr(RSA_F_RSA_PADDING_CHECK_X931, RSA_R_INVALID_TRAILER); - return -1; - } - - memcpy(to,p,(unsigned int)j); - - return(j); - } + const unsigned char *from, int flen, int num) +{ + int i = 0, j; + const unsigned char *p; + + p = from; + if ((num != flen) || ((*p != 0x6A) && (*p != 0x6B))) { + RSAerr(RSA_F_RSA_PADDING_CHECK_X931, RSA_R_INVALID_HEADER); + return -1; + } + + if (*p++ == 0x6B) { + j = flen - 3; + for (i = 0; i < j; i++) { + unsigned char c = *p++; + if (c == 0xBA) + break; + if (c != 0xBB) { + RSAerr(RSA_F_RSA_PADDING_CHECK_X931, RSA_R_INVALID_PADDING); + return -1; + } + } + + j -= i; + + if (i == 0) { + RSAerr(RSA_F_RSA_PADDING_CHECK_X931, RSA_R_INVALID_PADDING); + return -1; + } + + } else + j = flen - 2; + + if (p[j] != 0xCC) { + RSAerr(RSA_F_RSA_PADDING_CHECK_X931, RSA_R_INVALID_TRAILER); + return -1; + } + + memcpy(to, p, (unsigned int)j); + + return (j); +} /* Translate between X931 hash ids and NIDs */ int RSA_X931_hash_id(int nid) - { - switch (nid) - { - case NID_sha1: - return 0x33; - - case NID_sha256: - return 0x34; +{ + switch (nid) { + case NID_sha1: + return 0x33; - case NID_sha384: - return 0x36; + case NID_sha256: + return 0x34; - case NID_sha512: - return 0x35; + case NID_sha384: + return 0x36; - } - return -1; - } + case NID_sha512: + return 0x35; + } + return -1; +} |