> For the complete documentation index, see [llms.txt](https://developer.magtek.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://developer.magtek.com/api-and-command-reference/scra-dynafamily-programmers-manual/data-types-and-shared-tlv-data-objects/security-operation-type.md).

# Security Operation Type

This non-TLV data structure consists of four or five bytes that describes a security operation, including the algorithms and methods to be used in that operation.

## **Table SOT-1 - Security Operation Type**

<table><thead><tr><th width="89">Offset</th><th>Description</th><th width="75.33331298828125">Typ</th><th width="74.84857177734375">Req</th><th width="97.7574462890625">Default</th></tr></thead><tbody><tr><td>0</td><td><p></p><p>Operation Type</p><ul><li>0x01 = Key Agreement</li><li>0x02 = Command Authorization Using Signature</li><li>0x03 = Command Authorization Using MAC</li><li>0x05 = Data Authentication Using MAC</li><li>0x07 = Data Encryption</li><li>0x10 = Data Signature</li></ul></td><td>B</td><td>R</td><td></td></tr><tr><td>1</td><td><p></p><p>Operation Algorithm If <strong>Operation Type</strong> is Key Agreement type:</p><ul><li>0x01 = ECDHE</li></ul><p>If <strong>Operation Type</strong> is a Signature type:</p><ul><li>0x01 = ECDSA (indeterministic)</li></ul><p>If <strong>Operation Type</strong> is a MAC type:</p><ul><li>0x01 = HMAC</li><li>0x02 = CBC-MAC</li><li>0x03 = CMAC</li></ul><p>If <strong>Operation Type</strong> is an Encryption type:</p><ul><li>0x01 = DEA</li><li>0x02 = 2TDEA</li><li>0x03 = 3TDEA</li><li>0x04 = AES-128</li><li>0x05 = AES-192</li><li>0x06 = AES-256</li></ul></td><td>B</td><td>R</td><td></td></tr><tr><td>2</td><td><p>Operation Curve/Mode/Hash/Cipher If <strong>Operation Type</strong> is a Key Agreement type, this specifies the Curve:</p><ul><li>0x01 = P192</li><li>0x02 = P224</li><li>0x03 = P256</li><li>0x04 = P384</li><li>0x05 = P521</li></ul><p>If <strong>Operation Type</strong> is a Signature type, this specifies the Hash:</p><ul><li>0x01 = MD5</li><li>0x02 = SHA-1</li><li>0x03 = SHA-224</li><li>0x04 = SHA-256</li><li>0x05 = SHA-384</li><li>0x06 = SHA-512</li><li>0x07 = SHA-512/224</li><li>0x08 = SHA-512/256</li><li>0x09 = SHA3-224</li><li>0x0A = SHA3-256</li><li>0x0B = SHA3-384</li><li>0x0C = SHA3-512</li></ul><p>If <strong>Operation Type</strong> is a MAC type, this specifies the Encryption Algorithm:</p><ul><li>0x01 = DEA</li><li>0x02 = 2TDEA</li><li>0x03 = 3TDEA</li><li>0x04 = AES-128</li><li>0x05 = AES-192</li><li>0x06 = AES-256</li></ul><p>If <strong>Operation Type</strong> is an Encryption type, this specifies the Mode:</p><ul><li>0x01 = ECB (Block)</li><li>0x02 = CBC (Block)</li><li>0x03 = CFB (Stream)</li><li>0x04 = OFB (Stream)</li><li>0x05 = CTR (Stream)</li></ul></td><td>B</td><td>R</td><td></td></tr><tr><td>3</td><td><p></p><p>KDF/Curve/Padding If <strong>Operation Type</strong> is a Key Agreement type, this specifies the KDF:</p><ul><li>0x01 = SP800-56A / X9.63</li></ul><p>If <strong>Operation Type</strong> is a Signature type, this specifies the Curve:</p><ul><li>0x01 = P192</li><li>0x02 = P224</li><li>0x03 = P256</li><li>0x04 = P384</li><li>0x05 = P521</li></ul><p>If <strong>Operation Type</strong> is a MAC type, this specifies the Padding:</p><ul><li>0x00 = None (for streaming modes)</li><li>0x01 = Zeros (ISO 9797 Padding Method 1)</li><li>0x02 = One and zeros (ISO 9797 Method 2)</li><li>0x03 = Length + zeros (ISO 9797 Method 3)</li><li>0x10 = PKCS7 (pad # = pad length)</li><li>0x11 = X9.23 (random + pad length)</li><li>0x20 = Random (when length is known)</li></ul><p>If <strong>Operation Type</strong> is an Encryption type, this specifies the Padding:</p><ul><li>0x00 = None (for streaming modes)</li><li>0x01 = Zeros (ISO 9797 Padding Method 1)</li><li>0x02 = One and zeros (ISO 9797 Method 2)</li><li>0x03 = Length + zeros (ISO 9797 Method 3)</li><li>0x10 = PKCS7 (pad # = pad length)</li><li>0x11 = X9.23 (random + pad length)</li><li>0x20 = Random (when length is known)</li></ul></td><td>B</td><td>R</td><td></td></tr><tr><td>4</td><td>MAC Block Size If <strong>Operation Type</strong> is a MAC type, this specifies the data to be MACed must be padded to a multiple of this many bytes. For all other Operation Types, do not include this byte.</td><td>B</td><td>O</td><td></td></tr></tbody></table>


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