From a78c0632edd4c9c257362045dbf7c8ca4a045052 Mon Sep 17 00:00:00 2001 From: "Dr. Stephen Henson" Date: Mon, 6 Jun 2005 22:39:43 +0000 Subject: [PATCH] Fix for padding X9.31 padding check and zero padding bytes. --- crypto/rsa/rsa_x931.c | 16 +++++++++------- 1 file changed, 9 insertions(+), 7 deletions(-) diff --git a/crypto/rsa/rsa_x931.c b/crypto/rsa/rsa_x931.c index 7d77213d13..e918654176 100644 --- a/crypto/rsa/rsa_x931.c +++ b/crypto/rsa/rsa_x931.c @@ -115,9 +115,9 @@ int RSA_padding_check_X931(unsigned char *to, int tlen, return -1; } - j=flen-3; if (*p++ == 0x6B) { + j=flen-3; for (i = 0; i < j; i++) { unsigned char c = *p++; @@ -130,15 +130,17 @@ int RSA_padding_check_X931(unsigned char *to, int tlen, return -1; } } - } - j -= i; + j -= i; + + if (i == 0) + { + RSAerr(RSA_F_RSA_PADDING_CHECK_X931, RSA_R_INVALID_PADDING); + return -1; + } - if (i == 0) - { - RSAerr(RSA_F_RSA_PADDING_CHECK_X931, RSA_R_INVALID_PADDING); - return -1; } + else j = flen - 2; if (p[j] != 0xCC) { -- 2.25.1