Decrypt a big array of data

[Jordan C N Chong]

Dear all,

Sorry to send the similar email again. I am quite frustrated here. I wish to
decode a big chunk of data array with Blowfish (key size 16 bytes), ECB
mode, and 1024 bytes block by block, like the following picture

|--------------------------|
|    Big chunk of data     |
|--------------------------|
             ||
             \/
       1024 bytes block
       decryption with Blowfish
             ||
             \/
       Write the decrypted block
       into new block
             ||
             \/
|--------------------------|
|    Decrypted data        |
|--------------------------|

I have the following codes, but I know it is wrong... I wish you could help
me please to correct it a bit... THOUSAND THANKS.

================== the code =====================
// encryptedData is the char array which has the encrypted data
// decryptedData is the char array which is to store the decrypted data
// inbuf and outbuf are both 1024 bytes

// Decrypt the data
int kBufferSize = 1024;
EVP_CIPHER_CTX_init(&cipher);
EVP_DecryptInit(&cipher, EVP_bf_ecb(), BFkey, NULL);
int count = 0;
for (;;) {
        inlen = 0;
        for (int i=0; i<kBufferSize; i++) {
                if (i+count < filesize) {
                        inbuf[i] = encryptedData[i+count];
                        inlen++;
                }
        }

        if (!EVP_DecryptUpdate(&cipher, outbuf, &outlen, inbuf, inlen)) {
                printf("ERROR: Content decryption error.");
                exit(-1);
        }

        for (int j=0; j<kBufferSize; j++) {
                decryptedData[j+count] = outbuf[j];
        }

        count += kBufferSize;
}

if (!EVP_DecryptFinal(&cipher, outbuf, &outlen)) {
        printf("ERROR: Content decryption error");
        exit(-1);
}
for (int k=1; k<outlen; k++) {
        decryptedData[k+count] = outbuf[k];
}

Best regards,
--------------------------------------------
Jordan Cheun Ngen, Chong
INF-4067 Universiteit Twente
Postbus 217
7500 AE Enschede
The Netherlands

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Web site: http://www.cs.utwente.nl/~chong
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