mirror of https://github.com/moparisthebest/mail
50 lines
1.7 KiB
JavaScript
50 lines
1.7 KiB
JavaScript
/**
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* A Wrapper for SJCL's authenticated AES-GCM encryption
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*/
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app.crypto.AesGCM = function() {
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'use strict';
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var adata = []; // authenticated data (empty by default)
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var tlen = 128; // The tag length in bits
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/**
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* Encrypt a String using AES-GCM using the provided keysize (e.g. 128, 256)
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* @param plaintext [String] The input string in UTF8
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* @param key [String] The base64 encoded key
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* @param iv [String] The base64 encoded IV
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* @return [String] The base64 encoded ciphertext
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*/
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this.encrypt = function(plaintext, key, iv) {
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// convert parameters to WordArrays
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var keyWords = sjcl.codec.base64.toBits(key);
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var ivWords = sjcl.codec.base64.toBits(iv);
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var plaintextWords = sjcl.codec.utf8String.toBits(plaintext);
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var blockCipher = new sjcl.cipher.aes(keyWords);
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var ciphertext = sjcl.mode.gcm.encrypt(blockCipher, plaintextWords, ivWords, adata, tlen);
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var ctBase64 = sjcl.codec.base64.fromBits(ciphertext);
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return ctBase64;
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};
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/**
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* Decrypt a String using AES-GCM using the provided keysize (e.g. 128, 256)
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* @param ciphertext [String] The base64 encoded ciphertext
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* @param key [String] The base64 encoded key
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* @param iv [String] The base64 encoded IV
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* @return [String] The decrypted plaintext in UTF8
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*/
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this.decrypt = function(ciphertext, key, iv) {
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// convert parameters to WordArrays
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var keyWords = sjcl.codec.base64.toBits(key);
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var ivWords = sjcl.codec.base64.toBits(iv);
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var ciphertextWords = sjcl.codec.base64.toBits(ciphertext);
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var blockCipher = new sjcl.cipher.aes(keyWords);
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var decrypted = sjcl.mode.gcm.decrypt(blockCipher, ciphertextWords, ivWords, adata, tlen);
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var pt = sjcl.codec.utf8String.fromBits(decrypted);
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return pt;
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};
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}; |