Want to protect your cyber security and still get fast solutions? Ask a secure question today.Go Premium

x
  • Status: Solved
  • Priority: Medium
  • Security: Public
  • Views: 3014
  • Last Modified:

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.
0
NobMiwa
Asked:
NobMiwa
  • 2
1 Solution
 
btanExec ConsultantCommented:
0
 
NobMiwaAuthor Commented:
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..
0
 
btanExec ConsultantCommented:
Was thinking an6thing to do with padding or the parameter to decrypt function

http://www.openssl.org/docs/crypto/EVP_EncryptInit.html

.

EVP_DecryptInit_ex(),EVP_DecryptUpdate() andEVP_DecryptFinal_ex() are the corresponding decryption operations.EVP_DecryptFinal() will return an error code if padding is enabled and the final block is not correctly formatted. The parameters and restrictions are identical to the encryption operations except that if padding is enabled the decrypted data buffer out passed toEVP_DecryptUpdate() should have sufficient room for (inl + cipher_block_size) bytes unless the cipher block size is 1 in which case inl bytes is sufficient.
0

Featured Post

VIDEO: THE CONCERTO CLOUD FOR HEALTHCARE

Modern healthcare requires a modern cloud. View this brief video to understand how the Concerto Cloud for Healthcare can help your organization.

  • 2
Tackle projects and never again get stuck behind a technical roadblock.
Join Now