Re: How do I remove padding during AES decryption
Hello,
Please can any one tell me how do I remove the pad bytes during
AES decyrption using AES_cbc_encryption.
Provided that block_size is size of encryption algorithm block
size and last block is in dst you may use something like that:
.
.
pad = dst[block_size - 1];
if (pad block_size) {
goto err;
}
for (i = 1; i pad; i++) {
if (dst[block_size - 1 - i] != pad) {
goto err;
}
}
len = block_size - pad;
.
.
Proper length is returned in len.
Best regards,
--
Marek Marcola [EMAIL PROTECTED]
__
OpenSSL Project http://www.openssl.org
User Support Mailing Listopenssl-users@openssl.org
Automated List Manager [EMAIL PROTECTED]
RE: How do I remove padding during AES decryption
Hi All, Thanks for the reply. But I am aware of using EVP API's. Cant I remove the padding without using EVP API's. Regards, Jaya. -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of k b Sent: Saturday, September 16, 2006 10:22 PM To: openssl-users@openssl.org Subject: RE: How do I remove padding during AES decryption Jaya, You would have to use the EVP api that would do it for you. see http://www.openssl.org/docs/crypto/EVP_EncryptInit.html -kbisla From: Bhat, Jayalakshmi Manjunath [EMAIL PROTECTED] Reply-To: openssl-users@openssl.org To: openssl-users@openssl.org Subject: How do I remove padding during AES decryption Date: Sat, 16 Sep 2006 14:58:11 +0530 Hi all Please can any one tell me how do I remove the pad bytes during AES decyrption using AES_cbc_encryption. Regards, Jaya. __ OpenSSL Project http://www.openssl.org User Support Mailing Listopenssl-users@openssl.org Automated List Manager [EMAIL PROTECTED] __ OpenSSL Project http://www.openssl.org User Support Mailing Listopenssl-users@openssl.org Automated List Manager [EMAIL PROTECTED] __ OpenSSL Project http://www.openssl.org User Support Mailing Listopenssl-users@openssl.org Automated List Manager [EMAIL PROTECTED]
RE: How do I remove padding during AES decryption
Hi , Thanks a lot for th reply. But cant I remove the padding without using EVP API's. I want to use AES_cbc_encryption, directly for encryption/decryption. How do I remove padding here. Regards, Jaya. -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of k b Sent: Saturday, September 16, 2006 10:22 PM To: openssl-users@openssl.org Subject: RE: How do I remove padding during AES decryption Jaya, You would have to use the EVP api that would do it for you. see http://www.openssl.org/docs/crypto/EVP_EncryptInit.html -kbisla From: Bhat, Jayalakshmi Manjunath [EMAIL PROTECTED] Reply-To: openssl-users@openssl.org To: openssl-users@openssl.org Subject: How do I remove padding during AES decryption Date: Sat, 16 Sep 2006 14:58:11 +0530 Hi all Please can any one tell me how do I remove the pad bytes during AES decyrption using AES_cbc_encryption. Regards, Jaya. __ OpenSSL Project http://www.openssl.org User Support Mailing Listopenssl-users@openssl.org Automated List Manager [EMAIL PROTECTED] __ OpenSSL Project http://www.openssl.org User Support Mailing Listopenssl-users@openssl.org Automated List Manager [EMAIL PROTECTED] __ OpenSSL Project http://www.openssl.org User Support Mailing Listopenssl-users@openssl.org Automated List Manager [EMAIL PROTECTED]
RE: How do I remove padding during AES decryption
Jaya, You would have to use the EVP api that would do it for you. see http://www.openssl.org/docs/crypto/EVP_EncryptInit.html -kbisla From: Bhat, Jayalakshmi Manjunath [EMAIL PROTECTED] Reply-To: openssl-users@openssl.org To: openssl-users@openssl.org Subject: How do I remove padding during AES decryption Date: Sat, 16 Sep 2006 14:58:11 +0530 Hi all Please can any one tell me how do I remove the pad bytes during AES decyrption using AES_cbc_encryption. Regards, Jaya. __ OpenSSL Project http://www.openssl.org User Support Mailing Listopenssl-users@openssl.org Automated List Manager [EMAIL PROTECTED] __ OpenSSL Project http://www.openssl.org User Support Mailing Listopenssl-users@openssl.org Automated List Manager [EMAIL PROTECTED]
