Group Crypto

Business process blocks added by the Crypto module.

Description of blocks and variables

AES encryption and decryption

Blocks:

Crypto: Encrypt AES-CBC - AES encryption, CBC mode

Crypto: Decrypt AES-CBC - decrypts using AES algorithm, CBC mode

Crypto: Encrypt AES-ECB - encrypts using the AES algorithm, ECB mode

Crypto: Decrypt AES- ECB - decrypts using the AES algorithm, ECB mode

Variables:

"text" (string) - line for encryption / decryption

"key" (string) - key for encryption / decryption, length: 16 (128-bit encryption) or 32 (256-bit encryption) characters

"as_hex" and "as_base64" (boolean) - define the data format: Base64 or HEX

"result" (string) - encryption / desh result

At the input, the blocks receive a string and a key for encryption/decryption. For 128-bit encryption, you need to enter a key of 16 characters, for 256-bit - of 32.

The result of encryption or data for decryption can be presented in two formats - Base64 or HEX, two corresponding input variables are responsible for this.

RSA Encryption and Decryption

Blocks:

Crypto: Encrypt RSA - encrypts using the RSA algorithm

Crypto: Decrypt RSA - decrypts using the RSA algorithm

Variables:

"text" (string) - string for encryption / decryption, base64 format

"key" (text) - key for encryption / decryption, length: 117 (up to 1024 data bits), 245 (up to 2048 data bits) or 501 (up to 4096 data bits) characters

"result" (string) - result, base64 format

"success" (boolean) - success or failure

At the input, the blocks receive a string for encryption/decryption in base64 format, as well as a private or public key. The maximum data size for encryption depends on the key size: 1024 bits - 117 characters, 2048 bits - 245 characters, 4096 bits - 501 characters.

At the output, the blocks give the result of encryption/decryption in base64 format and pass in "success" the value "true" (if the operation is successful) or "false" (if not).

Creation of an electronic signature RSA

Blocks:

Crypto: RSA Sign (MD5) - creates an electronic signature, for the MD5 hash format

Crypto: RSA Sign (SHA1) - creates an electronic signature, for the SHA1 hash format

Crypto: RSA Sign (SHA256) - creates an electronic signature, for the SHA256 hash format

Crypto: RSA Sign (SHA512) - creates an electronic signature, for the SHA512 hash format

Variables:

"private_key "(text) - RSA private key

"md5_hash", "sha1_hash", "sha256_hash", "sha512_hash" (string) - hash of the corresponding format

"signature" (text) - electronic signature

The blocks receive a hash of the appropriate format and an RSA private key as input. The key length is determined automatically.

The output is a signature "signature" in text format.

RSA Electronic Signature Verification

Blocks:

Crypto: RSA Sign (SHA1) - verifies the electronic signature, for the SHA1 hash format

Crypto: RSA Sign (SHA256) - verifies the electronic signature, for the SHA256 hash format

Crypto: RSA Sign (SHA512) - verifies the electronic signature, for the SHA512 hash format

Variables:

"signature" (text) - electronic signature,

"public_key" (text) - public key,

"md5_hash", "sha1_hash", "sha256_hash", "sha512_hash" (string) - hash of the corresponding format,

"result" (boolean) - success or failure.

Blocks accept a signature, a hash of a certain format, and a public key at the input; at the output, they return to "result" the value "true" (if the signature is confirmed) or "false" (if not confirmed).

Generating RSA Keys

Blocks:

Crypto: Generate RSA key

Variables:

"key_size" (special type of variable) - key size: 1024, 2048, 3072, 4096 or 8192bit

"private_key" (text) - public key

"public_key" (text) - private key

The input block accepts the key size. At the exit, it gives the private and public keys. To generate keys, the capabilities of the OpenSSL library are used.