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Electric Imp crypto.verify() example
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// CONSTANTS | |
// Full key omitted but can be generated with: | |
// $ openssl genrsa -out rsa.key 2048 | |
const RSA_PRIVATE_KEY_PEM = @" | |
-----BEGIN RSA PRIVATE KEY----- | |
... | |
-----END RSA PRIVATE KEY-----"; | |
// The public key must be extracted from the private key file: | |
// $ openssl rsa -pubout < rsa.key > rsa.pub | |
const RSA_PUBLIC_KEY_PEM = @" | |
-----BEGIN PUBLIC KEY----- | |
... | |
-----END PUBLIC KEY-----"; | |
// FUNCTIONS | |
function decodePem(pemString) { | |
local lines = split(pemString, "\n"); | |
local start = -1; | |
local end = -1; | |
foreach (index, line in lines) { | |
if (line == "-----BEGIN PUBLIC KEY-----" || line == "-----BEGIN RSA PRIVATE KEY-----") start = index + 1; | |
if (line == "-----END PUBLIC KEY-----" || line == "-----END RSA PRIVATE KEY-----") end = index; | |
} | |
if (start != -1 && end > start) { | |
local all = lines.slice(start, end).reduce(@(a, b) a + b); | |
return http.base64decode(all); | |
} | |
return null; | |
} | |
function hexString(aBlob) { | |
local str = ""; | |
foreach (byte in aBlob) str += format("%02x", byte); | |
return str; | |
} | |
// START OF RUNTIME | |
local message = "Hello, World!"; | |
local mode = crypto.RSASSA_PKCS1_SHA256; | |
// NOTE 'message' and 'signuture would | |
crypto.sign(mode, message, decodePem(RSA_PRIVATE_KEY_PEM), function(error, signature) { | |
if (error) { | |
server.error(error); | |
return; | |
} | |
crypto.verify(mode, message, signature, decodePem(RSA_PUBLIC_KEY_PEM), function(error, isVerified) { | |
if (error) { | |
server.error(error); | |
return; | |
} | |
server.log("Message is " + (isVerified ? "valid" : "invalid")); | |
}); | |
}); |
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