Link to home
Start Free TrialLog in
Avatar of Nobuo Miwa
Nobuo Miwa

asked on

OpenSSL with C++, 3DES Decrypt

Hello Experts,

I have to create code to decrypt using OpenSSL 3DES in C++.

I decrypted my encrypted string with OpenSSL command line like followings,

echo -en "\xca\x99\x19\x61\xd1\x21\x4f......." |
openssl des3 -d
-K  e3c254b6ec976b4638f216c83de61504166d7.... -iv 4eed0d2f1c....

I have to create code those function in C++(DES_ncbc_encrypt()..etc).
I've already installed OpenSSL in my environment.

Windows 7 32bit, C++Builder

Please advice.
Avatar of btan
btan

Avatar of Nobuo Miwa

ASKER

Thank you for information.

I coded followings..

	unsigned char key[] = {0xe3,0xc2,0x54,0xb6,0xec,0x97,0x6b,0x46,0x38,0xf2,0x16,0xc8,0x3d,0xe6,0x15,0x04,0x16,0x6d,0x70,0x70,0xae,0x97,0xbf,0xb6};

	unsigned char iv[]  = {0x4e,0xed,0x0d,0x2f,0x1c,0x48,0xe0,0xf1};
	unsigned char encrypted[] = {0xca,0x99,0x19,0x61,0xd1,0x21,0x4f,0x77,0x3e,0x0d,0xd3,0xcc,0x07,0x9f,0x56,0x24};

	const EVP_CIPHER* cipherType = EVP_des_ede3_ecb();
	EVP_CIPHER_CTX ctx;
	EVP_CIPHER_CTX_init(&ctx);
	int rt = EVP_DecryptInit(&ctx, (const EVP_CIPHER*)cipherType, (const unsigned char*)key, (const unsigned char*)iv);

	int out_len;
	char ciphertext[2048] = {0};
	memset(ciphertext, 0x00, sizeof(ciphertext));

	rt = EVP_DecryptUpdate(&ctx, (unsigned char*)ciphertext, &out_len, (const unsigned char*)encrypted, 16);
	rt = EVP_DecryptFinal(&ctx, (unsigned char*)ciphertext, &out_len);

	rt = EVP_CIPHER_CTX_cleanup(&ctx);

Open in new window


The answer must be "berobero", but I got 8 letters and was not the answer.

Please advice, if you have any idea..
ASKER CERTIFIED SOLUTION
Avatar of btan
btan

Link to home
membership
This solution is only available to members.
To access this solution, you must be a member of Experts Exchange.
Start Free Trial