@sec-block/secjs-crypto

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secCrypto

using EC crypto generate privat key and public key it also can be used for user authentication class secCrypto could encrypt and decrypt message

Kind: global class

• secCrypto
  • .generateCryptoPrivKey()
  • .generateCryptoPubKey()
  • .secSign(privateKey, str, callback)
  • .secVerify(publicKey, sig)
  • .secEncrypt(publicKey, cryptoMsg, callback)
  • .secDecrypt(privateKey, encrypted, callback)
  • .getCryptoPrivKey()
  • .getCryptoPubKey()

Example

const secCrypto = require('../secCrypto_lib')


let TestSecCrypto = new SecCrypto()

secCrypto.generateCryptoPrivKey()

Kind: instance method of secCrypto
Example

let privateKey = TestSecCrypto.getCryptoPrivKey()

secCrypto.generateCryptoPubKey()

Corresponding uncompressed (65-byte) public key.

Kind: instance method of secCrypto

let publicKey = TestSecCrypt.getCryptoPubKey()

secCrypto.secSign(privateKey, str, callback)

Kind: instance method of secCrypto

Param	Type	Description
privateKey	Buffer	using private key signature message
str	string	input private key and message by string
callback	Buffer	message will be translated and saved in buffer

secCrypto.secVerify(publicKey, sig)

sig is from secSign() cipher verify user privat key and identity

Kind: instance method of secCrypto

Param	Type	Description
publicKey	Buffer	input public key and using public key decryption signature
sig	Buffer	decrypt signature and verify identify
Example
```js
TestSecCrypto.secSign(privateKey,str,(sig)=>{
console.log('Signature in DER format:', sig)

TestSecCrypto.secVerify(publicKey,sig)

})

<a name="secCrypto+secEncrypt"></a>

### secCrypto.secEncrypt(publicKey, cryptoMsg, callback)
user decrypting the message with privat key.

**Kind**: instance method of [<code>secCrypto</code>](#secCrypto)  

| Param | Type | Description |
| --- | --- | --- |
| publicKey | <code>Buffer</code> | input public key and use public key encrypt message |
| cryptoMsg | <code>string</code> | input message |
| callback | <code>Buffer</code> | callback cipher |

<a name="secCrypto+secDecrypt"></a>

### secCrypto.secDecrypt(privateKey, encrypted, callback)
using private key decrypt cipher

**Kind**: instance method of [<code>secCrypto</code>](#secCrypto)  

| Param | Type | Description |
| --- | --- | --- |
| privateKey | <code>Buffer</code> | input private key and use private key decrypt cipher |
| encrypted | <code>Buffer</code> | input cipher |
| callback | <code>string</code> | callback plaintext |
**Example**
```js
let text = 'Hello World'
TestSecCrypto.secEncrypt(publicKey,text,(cipher)=>{

    console.log('cipher:',cipher)

    TestSecCrypto.secDecrypt(privateKey,cipher,(plaintext)=>{
        console.log('Plaintext:', plaintext)

        let strPlaintext = plaintext.toString()
        console.log('Plaintext to String:', strPlaintext)
    })
    
})

secCrypto.getCryptoPrivKey()

return private key

Kind: instance method of secCrypto

secCrypto.getCryptoPubKey()

return public key

Kind: instance method of secCrypto