On Mon May 19 2008 09:35, karim Bendadda wrote:
> *Sorry for the first mail!!*
>
Unless you can guarantee that the strings do not contain embedded zeros;
strlen() will not give the expected results.
Mike
> Hi all,
>
> I'm new on openssl development, so I'm sorry if that a "beginner's"
> question . I'm trying to decrypt a *base64 AES CBC* encrypted data (using
> the *AES_cbc_encrypt*). The base64 encoding/decoding works fine. the code
> below works depending on data length:
>
> - The example with :
>
>
> data ="*This is a long very long test*" works fine, I have the good
> decrypted data.
>
> - The second one "*This is a test*" doesn't work... I read somewhere
> that's depending of data padding... Have you any idea??
>
>
> ......
> int main(int argc, char *argv[])
> {
> unsigned char key[] = {0,1,2,3,4,5,6,7,8,9,0,'a','b','c','d','e'};
> unsigned char iv[] = {0,1,2,3,4,5,6,7,8,9,0,'a','b','c','d','e'};
> unsigned char iv1[] = {0,1,2,3,4,5,6,7,8,9,0,'a','b','c','d','e'};
>
>
>
> unsigned char* data ="This is a test";
> //unsigned char* data ="This is a long very long test";
>
> unsigned char* buffer = (char *) malloc(60);
> unsigned char* buffer1 = (char *) malloc(60);
>
>
> unsigned long bufferLength= (ceil(strlen(data)/16)+1)*16;
>
> AES_KEY aeskeyEnc, aeskeyDec;
>
>
> AES_set_encrypt_key (key, KeyLength*8, &aeskeyEnc);
> AES_set_decrypt_key (key, KeyLength*8, &aeskeyDec);
>
> /*Encrypting...*/
> AES_cbc_encrypt(data, buffer, bufferLength, &aeskeyEnc, iv,
> AES_ENCRYPT);
> //AES_cbc_encrypt(data, buffer, strlen(data), &aeskeyEnc, iv,
> AES_ENCRYPT);
> printf("Encrypted data: %s\n",buffer);
>
>
> /*To Base64 encrypted data */
> char *base64Buffer = base64(buffer, strlen(buffer));
> printf("Base64 Encrypted data: %s\n",base64Buffer);
>
>
> /* Unbase64 of encrypted data*/
> char* test_1 = strcat(base64Buffer,"\n\0");
> char* unBase64 = unbase64(base64Buffer, strlen(base64Buffer));
>
>
> /*Decypting unBase64...*/
> AES_cbc_encrypt(unBase64, buffer1,bufferLength, &aeskeyDec, iv1,
> AES_DECRYPT);
> //AES_cbc_encrypt(unBase64, buffer1, strlen(unBase64), &aeskeyDec, iv1,
> AES_DECRYPT);
> printf("Decrypted data: %s \n",buffer1);
>
>
>
> return(0);
> }
>
>
>
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