3DES decrytpion
hi, I'm trying to use the crypto library to decrypt a file which has been encrypted using triple-DES. I have the following declarations: char *temp; char **elines; des_cblock *input; I have a function which parses the file and grabs the encrypted strings temp = parse_file(mapped_file); I then set elines[i] = temp; However I can't pass elines[i] to des_ecb3_encrypt() as it is not declared as des_cblock. Is there any way of casting it, passing it, some way of passing the data returned by the parse_file() function to des_ecb3_encrypt()? Also, am I right in thinking that des_cblock being defined the way it is , that you can only decrypt in batches of 8 characters?? Thanks! Stella __ OpenSSL Project http://www.openssl.org User Support Mailing List[EMAIL PROTECTED] Automated List Manager [EMAIL PROTECTED]
Re: 3DES decrytpion
Do you have any reason to do not use EVP_Cipher*() functions instead of low-level des_ecb3_encrypt()? EVP functions provide very good abstraction layer and hide many algorithm specific details. Aleksey Sanin. Stella Power wrote: hi, I'm trying to use the crypto library to decrypt a file which has been encrypted using triple-DES. I have the following declarations: char *temp; char **elines; des_cblock *input; I have a function which parses the file and grabs the encrypted strings temp = parse_file(mapped_file); I then set elines[i] = temp; However I can't pass elines[i] to des_ecb3_encrypt() as it is not declared as des_cblock. Is there any way of casting it, passing it, some way of passing the data returned by the parse_file() function to des_ecb3_encrypt()? Also, am I right in thinking that des_cblock being defined the way it is , that you can only decrypt in batches of 8 characters?? Thanks! Stella __ OpenSSL Project http://www.openssl.org User Support Mailing List[EMAIL PROTECTED] Automated List Manager [EMAIL PROTECTED] __ OpenSSL Project http://www.openssl.org User Support Mailing List[EMAIL PROTECTED] Automated List Manager [EMAIL PROTECTED]
Re: 3DES decrytpion
I'm afraid that I couldn't find any examples on how to use the EVP functions, and still do not know how I would go about implementing it. The only restriction I have on my code is that the encrypted input file is 3DES ECB encrypted. Stella On Wed, May 01, 2002 at 09:03:42AM -0700, Aleksey Sanin wrote: Do you have any reason to do not use EVP_Cipher*() functions instead of low-level des_ecb3_encrypt()? EVP functions provide very good abstraction layer and hide many algorithm specific details. Aleksey Sanin. Stella Power wrote: hi, I'm trying to use the crypto library to decrypt a file which has been encrypted using triple-DES. I have the following declarations: char *temp; char **elines; des_cblock *input; I have a function which parses the file and grabs the encrypted strings temp = parse_file(mapped_file); I then set elines[i] = temp; However I can't pass elines[i] to des_ecb3_encrypt() as it is not declared as des_cblock. Is there any way of casting it, passing it, some way of passing the data returned by the parse_file() function to des_ecb3_encrypt()? Also, am I right in thinking that des_cblock being defined the way it is , that you can only decrypt in batches of 8 characters?? Thanks! Stella __ OpenSSL Project http://www.openssl.org User Support Mailing List[EMAIL PROTECTED] Automated List Manager [EMAIL PROTECTED] __ OpenSSL Project http://www.openssl.org User Support Mailing List[EMAIL PROTECTED] Automated List Manager [EMAIL PROTECTED] __ OpenSSL Project http://www.openssl.org User Support Mailing List[EMAIL PROTECTED] Automated List Manager [EMAIL PROTECTED]
Re: 3DES decrytpion
Well, using EVP functions is not too difficult (http://www.openssl.org/docs/crypto/EVP_EncryptInit.html#): 1) init context EVP_CIPHER_CTX ctx; EVP_CIPHER_CTX_init(ctx); 2) init cipher EVP_CipherInit(ctx, EVP_des_ede3_cbc(), key, iv, encrypt); 3) encrypt/decrypt data while available EVP_CipherUpdate(ctx, out, outLen, in, inLen); 4) encrypt/decrypt the last block EVP_CipherFinal(ctx, out, outLen); 5) cleanup context EVP_CIPHER_CTX_cleanup(ctx); You can also take a look at test/evp_test.c file in OpenSSL package. Aleksey Sanin. Stella Power wrote: I'm afraid that I couldn't find any examples on how to use the EVP functions, and still do not know how I would go about implementing it. The only restriction I have on my code is that the encrypted input file is 3DES ECB encrypted. Stella On Wed, May 01, 2002 at 09:03:42AM -0700, Aleksey Sanin wrote: Do you have any reason to do not use EVP_Cipher*() functions instead of low-level des_ecb3_encrypt()? EVP functions provide very good abstraction layer and hide many algorithm specific details. Aleksey Sanin. Stella Power wrote: hi, I'm trying to use the crypto library to decrypt a file which has been encrypted using triple-DES. I have the following declarations: char *temp; char **elines; des_cblock *input; I have a function which parses the file and grabs the encrypted strings temp = parse_file(mapped_file); I then set elines[i] = temp; However I can't pass elines[i] to des_ecb3_encrypt() as it is not declared as des_cblock. Is there any way of casting it, passing it, some way of passing the data returned by the parse_file() function to des_ecb3_encrypt()? Also, am I right in thinking that des_cblock being defined the way it is , that you can only decrypt in batches of 8 characters?? Thanks! Stella __ OpenSSL Project http://www.openssl.org User Support Mailing List[EMAIL PROTECTED] Automated List Manager [EMAIL PROTECTED] __ OpenSSL Project http://www.openssl.org User Support Mailing List[EMAIL PROTECTED] Automated List Manager [EMAIL PROTECTED] __ OpenSSL Project http://www.openssl.org User Support Mailing List[EMAIL PROTECTED] Automated List Manager [EMAIL PROTECTED] __ OpenSSL Project http://www.openssl.org User Support Mailing List[EMAIL PROTECTED] Automated List Manager [EMAIL PROTECTED]
