AESGCM::encryptAndAppendTag() - Code Metrics - Inspection of "Merge remote-tracking branch 'origin/master'" - Spomky-Labs/php-aes-gcm - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Push — master ( b8db86...b90281 )

by Florent

created 2016-11-14 18:15 UTC

AESGCM::encryptAndAppendTag() A

↳ Parent: AESGCM

Complexity

Conditions	1
Paths	1

Size

Total Lines	4
Code Lines	2

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
dl	0
loc	4
rs	10
c	0
b	0
f	0
cc	1
eloc	2
nc	1
nop	5

<?php

/*
 * The MIT License (MIT)
 *
 * Copyright (c) 2016 Spomky-Labs
 *
 * This software may be modified and distributed under the terms
 * of the MIT license.  See the LICENSE file for details.
 */

namespace AESGCM;

use Assert\Assertion;

final class AESGCM
{
    /**
     * @param string      $K          Key encryption key
     * @param string      $IV         Initialization vector
     * @param null|string $P          Data to encrypt (null for authentication)
     * @param null|string $A          Additional Authentication Data
     * @param int         $tag_length Tag length
     *
     * @return array
     */
    public static function encrypt($K, $IV, $P = null, $A = null, $tag_length = 128)
    {
        Assertion::string($K, 'The key encryption key must be a binary string.');
        Assertion::string($IV, 'The Initialization Vector must be a binary string.');
        Assertion::nullOrString($P, 'The data to encrypt must be null or a binary string.');
        Assertion::nullOrString($A, 'The Additional Authentication Data must be null or a binary string.');
        Assertion::integer($tag_length, 'Invalid tag length. Supported values are: 128, 120, 112, 104 and 96.');
        Assertion::inArray($tag_length, [128, 120, 112, 104, 96], 'Invalid tag length. Supported values are: 128, 120, 112, 104 and 96.');
        list($J0, $v, $a_len_padding, $H) = self::common($K, $IV, $A);

        $C = self::getGCTR($K, self::getInc(32, $J0), $P);
        $u = self::calcVector($C);
        $c_len_padding = self::addPadding($C);

        $S = self::getHash($H, $A.str_pad('', $v / 8, "\0").$C.str_pad('', $u / 8, "\0").$a_len_padding.$c_len_padding);
        $T = self::getMSB($tag_length, self::getGCTR($K, $J0, $S));

        return [$C, $T];
    }

    /**
     * This method will append the tag at the end of the ciphertext.
     *
     * @param string      $K          Key encryption key
     * @param string      $IV         Initialization vector
     * @param null|string $P          Data to encrypt (null for authentication)
     * @param null|string $A          Additional Authentication Data
     * @param int         $tag_length Tag length
     *
     * @return string
     */
    public static function encryptAndAppendTag($K, $IV, $P = null, $A = null, $tag_length = 128)
    {
        return implode(self::encrypt($K, $IV, $P, $A, $tag_length));
    }

    /**
     * @param string      $K  Key encryption key
     * @param string      $IV Initialization vector
     * @param string|null $C  Data to encrypt (null for authentication)
     * @param string|null $A  Additional Authentication Data
     * @param string      $T  Tag
     *
     * @return string
     */
    public static function decrypt($K, $IV, $C = null, $A = null, $T)
    {
        Assertion::string($K, 'The key encryption key must be a binary string.');
        Assertion::string($IV, 'The Initialization Vector must be a binary string.');
        Assertion::nullOrString($C, 'The data to encrypt must be null or a binary string.');
        Assertion::nullOrString($A, 'The Additional Authentication Data must be null or a binary string.');

        $tag_length = self::getLength($T);
        Assertion::integer($tag_length, 'Invalid tag length. Supported values are: 128, 120, 112, 104 and 96.');
        Assertion::inArray($tag_length, [128, 120, 112, 104, 96], 'Invalid tag length. Supported values are: 128, 120, 112, 104 and 96.');
        list($J0, $v, $a_len_padding, $H) = self::common($K, $IV, $A);

        $P = self::getGCTR($K, self::getInc(32, $J0), $C);

        $u = self::calcVector($C);
        $c_len_padding = self::addPadding($C);

        $S = self::getHash($H, $A.str_pad('', $v / 8, "\0").$C.str_pad('', $u / 8, "\0").$a_len_padding.$c_len_padding);
        $T1 = self::getMSB($tag_length, self::getGCTR($K, $J0, $S));
        $result = strcmp($T, $T1);
        Assertion::eq($result, 0, 'Unable to decrypt or to verify the tag.');

        return $P;
    }

    /**
     * This method should be used if the tag is appended at the end of the ciphertext.
     * It is used by some AES GCM implementations such as the Java one.
     *
     * @param string      $K          Key encryption key
     * @param string      $IV         Initialization vector
     * @param string|null $Ciphertext Data to encrypt (null for authentication)
     * @param string|null $A          Additional Authentication Data
     * @param int         $tag_length Tag length
     *
     * @return string
     *
     * @see self::encryptAndAppendTag
     */
    public static function decryptWithAppendedTag($K, $IV, $Ciphertext = null, $A = null, $tag_length = 128)
    {
        $tag_length_in_bits = $tag_length/8;
        $C = mb_substr($Ciphertext, 0, -$tag_length_in_bits, '8bit');
        $T = mb_substr($Ciphertext, -$tag_length_in_bits, null, '8bit');

        return self::decrypt($K, $IV, $C, $A, $T);
    }

    /**
     * @param $K
     * @param $IV
     * @param $A
     *
     * @return array
     */
    private static function common($K, $IV, $A)
    {
        $key_length = mb_strlen($K, '8bit') * 8;
        Assertion::inArray($key_length, [128, 192, 256], 'Bad key encryption key length.');

        $H = openssl_encrypt(str_repeat("\0", 16), 'aes-'.($key_length).'-ecb', $K, OPENSSL_NO_PADDING | OPENSSL_RAW_DATA); //---
        $iv_len = self::getLength($IV);

        if (96 === $iv_len) {
            $J0 = $IV.pack('H*', '00000001');
        } else {
            $s = self::calcVector($IV);
            Assertion::eq(($s + 64) % 8, 0, 'Unable to decrypt or to verify the tag.');

            $packed_iv_len = pack('N', $iv_len);
            $iv_len_padding = str_pad($packed_iv_len, 8, "\0", STR_PAD_LEFT);
            $hash_X = $IV.str_pad('', ($s + 64) / 8, "\0").$iv_len_padding;
            $J0 = self::getHash($H, $hash_X);
        }
        $v = self::calcVector($A);
        $a_len_padding = self::addPadding($A);

        return [$J0, $v, $a_len_padding, $H];
    }

    /**
     * @param string $value
     *
     * @return int
     */
    private static function calcVector($value)
    {
        return (128 * ceil(self::getLength($value) / 128)) - self::getLength($value);
    }

    /**
     * @param string $value
     *
     * @return string
     */
    private static function addPadding($value)
    {
        return str_pad(pack('N', self::getLength($value)), 8, "\0", STR_PAD_LEFT);
    }

    /**
     * @param string $x
     *
     * @return int
     */
    private static function getLength($x)
    {
        return mb_strlen($x, '8bit') * 8;
    }

    /**
     * @param int $num_bits
     * @param int $x
     *
     * @return string
     */
    private static function getMSB($num_bits, $x)
    {
        $num_bytes = $num_bits / 8;

        return mb_substr($x, 0, $num_bytes, '8bit');
    }

    /**
     * @param int $num_bits
     * @param int $x
     *
     * @return string
     */
    private static function getLSB($num_bits, $x)
    {
        $num_bytes = ($num_bits / 8);

        return mb_substr($x, -$num_bytes, null, '8bit');
    }

    /**
     * @param int $s_bits
     * @param int $x
     *
     * @return string
     */
    private static function getInc($s_bits, $x)
    {
        $lsb = self::getLSB($s_bits, $x);
        $X = self::toUInt32Bits($lsb) + 1;
        $res = self::getMSB(self::getLength($x) - $s_bits, $x).pack('N', $X);

        return $res;
    }

    /**
     * @param string $bin
     *
     * @return mixed
     */
    private static function toUInt32Bits($bin)
    {
        list(, $h, $l) = unpack('n*', $bin);

        return $l + ($h * 0x010000);
    }

    /**
     * @param $X
     * @param $Y
     *
     * @return string
     */
    private static function getProduct($X, $Y)
    {
        $R = pack('H*', 'E1').str_pad('', 15, "\0");
        $Z = str_pad('', 16, "\0");
        $V = $Y;

        $parts = str_split($X, 4);
        $x = sprintf('%032b%032b%032b%032b', self::toUInt32Bits($parts[0]), self::toUInt32Bits($parts[1]), self::toUInt32Bits($parts[2]), self::toUInt32Bits($parts[3]));
        $lsb_mask = "\1";
        for ($i = 0; $i < 128; $i++) {
            if ($x[$i]) {
                $Z = self::getBitXor($Z, $V);
            }
            $lsb_8 = mb_substr($V, -1, null, '8bit');
            if (ord($lsb_8 & $lsb_mask)) {
                $V = self::getBitXor(self::shiftStringToRight($V), $R);
            } else {
                $V = self::shiftStringToRight($V);
            }
        }

        return $Z;
    }

    /**
     * @param string $input
     *
     * @return string
     */
    private static function shiftStringToRight($input)
    {
        $width = 4;
        $parts = array_map('self::toUInt32Bits', str_split($input, $width));
        $runs = count($parts);

        for ($i = $runs - 1; $i >= 0; $i--) {
            if ($i) {
                $lsb1 = $parts[$i - 1] & 0x00000001;
                if ($lsb1) {
                    $parts[$i] = ($parts[$i] >> 1) | 0x80000000;
                    $parts[$i] = pack('N', $parts[$i]);
                    continue;
                }
            }
            $parts[$i] = ($parts[$i] >> 1) & 0x7FFFFFFF;
            $parts[$i] = pack('N', $parts[$i]);
        }
        $res = implode('', $parts);

        return $res;
    }

    /**
     * @param string $H
     * @param string $X
     *
     * @return mixed
     */
    private static function getHash($H, $X)
    {
        $Y = [];
        $Y[0] = str_pad('', 16, "\0");
        $num_blocks = (int) (mb_strlen($X, '8bit') / 16);
        for ($i = 1; $i <= $num_blocks; $i++) {
            $Y[$i] = self::getProduct(self::getBitXor($Y[$i - 1], mb_substr($X, ($i - 1) * 16, 16, '8bit')), $H);
        }

        return $Y[$num_blocks];
    }

    /**
     * @param string $K
     * @param string $ICB
     * @param string $X
     *
     * @return string
     */
    private static function getGCTR($K, $ICB, $X)
    {
        if (empty($X)) {
            return '';
        }

        $n = (int) ceil(self::getLength($X) / 128);
        $CB = [];
        $Y = [];
        $CB[1] = $ICB;
        for ($i = 2; $i <= $n; $i++) {
            $CB[$i] = self::getInc(32, $CB[$i - 1]);
        }
        $key_length = strlen($K) * 8;
        $mode = 'aes-'.($key_length).'-ecb';
        for ($i = 1; $i < $n; $i++) {
            $C = openssl_encrypt($CB[$i], $mode, $K, OPENSSL_NO_PADDING | OPENSSL_RAW_DATA);
            $Y[$i] = self::getBitXor(mb_substr($X, ($i - 1) * 16, 16, '8bit'), $C);
        }

        $Xn = mb_substr($X, ($n - 1) * 16, null, '8bit');
        $C = openssl_encrypt($CB[$n], $mode, $K, OPENSSL_NO_PADDING | OPENSSL_RAW_DATA);
        $Y[$n] = self::getBitXor($Xn, self::getMSB(self::getLength($Xn), $C));

        return implode('', $Y);
    }

    /**
     * @param string $o1
     * @param string $o2
     *
     * @return string
     */
    private static function getBitXor($o1, $o2)
    {
        $xorWidth = PHP_INT_SIZE;
        $o1 = str_split($o1, $xorWidth);
        $o2 = str_split($o2, $xorWidth);
        $res = '';
        $runs = count($o1);
        for ($i = 0; $i < $runs; $i++) {
            $res .= $o1[$i] ^ $o2[$i];
        }

        return $res;
    }
}


1			<?php
2
3			/*
4			* The MIT License (MIT)
5			*
6			* Copyright (c) 2016 Spomky-Labs
7			*
8			* This software may be modified and distributed under the terms
9			* of the MIT license. See the LICENSE file for details.
10			*/
11
12			namespace AESGCM;
13
14			use Assert\Assertion;
15
16			final class AESGCM
17			{
18			/**
19			* @param string $K Key encryption key
20			* @param string $IV Initialization vector
21			* @param null\|string $P Data to encrypt (null for authentication)
22			* @param null\|string $A Additional Authentication Data
23			* @param int $tag_length Tag length
24			*
25			* @return array
26			*/
27			public static function encrypt($K, $IV, $P = null, $A = null, $tag_length = 128)
28			{
29			Assertion::string($K, 'The key encryption key must be a binary string.');
30			Assertion::string($IV, 'The Initialization Vector must be a binary string.');
31			Assertion::nullOrString($P, 'The data to encrypt must be null or a binary string.');
32			Assertion::nullOrString($A, 'The Additional Authentication Data must be null or a binary string.');
33			Assertion::integer($tag_length, 'Invalid tag length. Supported values are: 128, 120, 112, 104 and 96.');
34			Assertion::inArray($tag_length, [128, 120, 112, 104, 96], 'Invalid tag length. Supported values are: 128, 120, 112, 104 and 96.');
35			list($J0, $v, $a_len_padding, $H) = self::common($K, $IV, $A);
36
37			$C = self::getGCTR($K, self::getInc(32, $J0), $P);
38			$u = self::calcVector($C);
39			$c_len_padding = self::addPadding($C);
40
41			$S = self::getHash($H, $A.str_pad('', $v / 8, "\0").$C.str_pad('', $u / 8, "\0").$a_len_padding.$c_len_padding);
42			$T = self::getMSB($tag_length, self::getGCTR($K, $J0, $S));
43
44			return [$C, $T];
45			}
46
47			/**
48			* This method will append the tag at the end of the ciphertext.
49			*
50			* @param string $K Key encryption key
51			* @param string $IV Initialization vector
52			* @param null\|string $P Data to encrypt (null for authentication)
53			* @param null\|string $A Additional Authentication Data
54			* @param int $tag_length Tag length
55			*
56			* @return string
57			*/
58			public static function encryptAndAppendTag($K, $IV, $P = null, $A = null, $tag_length = 128)
59			{
60			return implode(self::encrypt($K, $IV, $P, $A, $tag_length));
61			}
62
63			/**
64			* @param string $K Key encryption key
65			* @param string $IV Initialization vector
66			* @param string\|null $C Data to encrypt (null for authentication)
67			* @param string\|null $A Additional Authentication Data
68			* @param string $T Tag
69			*
70			* @return string
71			*/
72			public static function decrypt($K, $IV, $C = null, $A = null, $T)
73			{
74			Assertion::string($K, 'The key encryption key must be a binary string.');
75			Assertion::string($IV, 'The Initialization Vector must be a binary string.');
76			Assertion::nullOrString($C, 'The data to encrypt must be null or a binary string.');
77			Assertion::nullOrString($A, 'The Additional Authentication Data must be null or a binary string.');
78
79			$tag_length = self::getLength($T);
80			Assertion::integer($tag_length, 'Invalid tag length. Supported values are: 128, 120, 112, 104 and 96.');
81			Assertion::inArray($tag_length, [128, 120, 112, 104, 96], 'Invalid tag length. Supported values are: 128, 120, 112, 104 and 96.');
82			list($J0, $v, $a_len_padding, $H) = self::common($K, $IV, $A);
83
84			$P = self::getGCTR($K, self::getInc(32, $J0), $C);
85
86			$u = self::calcVector($C);
87			$c_len_padding = self::addPadding($C);
88
89			$S = self::getHash($H, $A.str_pad('', $v / 8, "\0").$C.str_pad('', $u / 8, "\0").$a_len_padding.$c_len_padding);
90			$T1 = self::getMSB($tag_length, self::getGCTR($K, $J0, $S));
91			$result = strcmp($T, $T1);
92			Assertion::eq($result, 0, 'Unable to decrypt or to verify the tag.');
93
94			return $P;
95			}
96
97			/**
98			* This method should be used if the tag is appended at the end of the ciphertext.
99			* It is used by some AES GCM implementations such as the Java one.
100			*
101			* @param string $K Key encryption key
102			* @param string $IV Initialization vector
103			* @param string\|null $Ciphertext Data to encrypt (null for authentication)
104			* @param string\|null $A Additional Authentication Data
105			* @param int $tag_length Tag length
106			*
107			* @return string
108			*
109			* @see self::encryptAndAppendTag
110			*/
111			public static function decryptWithAppendedTag($K, $IV, $Ciphertext = null, $A = null, $tag_length = 128)
112			{
113			$tag_length_in_bits = $tag_length/8;
114			$C = mb_substr($Ciphertext, 0, -$tag_length_in_bits, '8bit');
115			$T = mb_substr($Ciphertext, -$tag_length_in_bits, null, '8bit');
116
117			return self::decrypt($K, $IV, $C, $A, $T);
118			}
119
120			/**
121			* @param $K
122			* @param $IV
123			* @param $A
124			*
125			* @return array
126			*/
127			private static function common($K, $IV, $A)
128			{
129			$key_length = mb_strlen($K, '8bit') * 8;
130			Assertion::inArray($key_length, [128, 192, 256], 'Bad key encryption key length.');
131
132			$H = openssl_encrypt(str_repeat("\0", 16), 'aes-'.($key_length).'-ecb', $K, OPENSSL_NO_PADDING \| OPENSSL_RAW_DATA); //---
133			$iv_len = self::getLength($IV);
134
135			if (96 === $iv_len) {
136			$J0 = $IV.pack('H*', '00000001');
137			} else {
138			$s = self::calcVector($IV);
139			Assertion::eq(($s + 64) % 8, 0, 'Unable to decrypt or to verify the tag.');
140
141			$packed_iv_len = pack('N', $iv_len);
142			$iv_len_padding = str_pad($packed_iv_len, 8, "\0", STR_PAD_LEFT);
143			$hash_X = $IV.str_pad('', ($s + 64) / 8, "\0").$iv_len_padding;
144			$J0 = self::getHash($H, $hash_X);
145			}
146			$v = self::calcVector($A);
147			$a_len_padding = self::addPadding($A);
148
149			return [$J0, $v, $a_len_padding, $H];
150			}
151
152			/**
153			* @param string $value
154			*
155			* @return int
156			*/
157			private static function calcVector($value)
158			{
159			return (128 * ceil(self::getLength($value) / 128)) - self::getLength($value);
160			}
161
162			/**
163			* @param string $value
164			*
165			* @return string
166			*/
167			private static function addPadding($value)
168			{
169			return str_pad(pack('N', self::getLength($value)), 8, "\0", STR_PAD_LEFT);
170			}
171
172			/**
173			* @param string $x
174			*
175			* @return int
176			*/
177			private static function getLength($x)
178			{
179			return mb_strlen($x, '8bit') * 8;
180			}
181
182			/**
183			* @param int $num_bits
184			* @param int $x
185			*
186			* @return string
187			*/
188			private static function getMSB($num_bits, $x)
189			{
190			$num_bytes = $num_bits / 8;
191
192			return mb_substr($x, 0, $num_bytes, '8bit');
193			}
194
195			/**
196			* @param int $num_bits
197			* @param int $x
198			*
199			* @return string
200			*/
201			private static function getLSB($num_bits, $x)
202			{
203			$num_bytes = ($num_bits / 8);
204
205			return mb_substr($x, -$num_bytes, null, '8bit');
206			}
207
208			/**
209			* @param int $s_bits
210			* @param int $x
211			*
212			* @return string
213			*/
214			private static function getInc($s_bits, $x)
215			{
216			$lsb = self::getLSB($s_bits, $x);
217			$X = self::toUInt32Bits($lsb) + 1;
218			$res = self::getMSB(self::getLength($x) - $s_bits, $x).pack('N', $X);
219
220			return $res;
221			}
222
223			/**
224			* @param string $bin
225			*
226			* @return mixed
227			*/
228			private static function toUInt32Bits($bin)
229			{
230			list(, $h, $l) = unpack('n*', $bin);
231
232			return $l + ($h * 0x010000);
233			}
234
235			/**
236			* @param $X
237			* @param $Y
238			*
239			* @return string
240			*/
241			private static function getProduct($X, $Y)
242			{
243			$R = pack('H*', 'E1').str_pad('', 15, "\0");
244			$Z = str_pad('', 16, "\0");
245			$V = $Y;
246
247			$parts = str_split($X, 4);
248			$x = sprintf('%032b%032b%032b%032b', self::toUInt32Bits($parts[0]), self::toUInt32Bits($parts[1]), self::toUInt32Bits($parts[2]), self::toUInt32Bits($parts[3]));
249			$lsb_mask = "\1";
250			for ($i = 0; $i < 128; $i++) {
251			if ($x[$i]) {
252			$Z = self::getBitXor($Z, $V);
253			}
254			$lsb_8 = mb_substr($V, -1, null, '8bit');
255			if (ord($lsb_8 & $lsb_mask)) {
256			$V = self::getBitXor(self::shiftStringToRight($V), $R);
257			} else {
258			$V = self::shiftStringToRight($V);
259			}
260			}
261
262			return $Z;
263			}
264
265			/**
266			* @param string $input
267			*
268			* @return string
269			*/
270			private static function shiftStringToRight($input)
271			{
272			$width = 4;
273			$parts = array_map('self::toUInt32Bits', str_split($input, $width));
274			$runs = count($parts);
275
276			for ($i = $runs - 1; $i >= 0; $i--) {
277			if ($i) {
278			$lsb1 = $parts[$i - 1] & 0x00000001;
279			if ($lsb1) {
280			$parts[$i] = ($parts[$i] >> 1) \| 0x80000000;
281			$parts[$i] = pack('N', $parts[$i]);
282			continue;
283			}
284			}
285			$parts[$i] = ($parts[$i] >> 1) & 0x7FFFFFFF;
286			$parts[$i] = pack('N', $parts[$i]);
287			}
288			$res = implode('', $parts);
289
290			return $res;
291			}
292
293			/**
294			* @param string $H
295			* @param string $X
296			*
297			* @return mixed
298			*/
299			private static function getHash($H, $X)
300			{
301			$Y = [];
302			$Y[0] = str_pad('', 16, "\0");
303			$num_blocks = (int) (mb_strlen($X, '8bit') / 16);
304			for ($i = 1; $i <= $num_blocks; $i++) {
305			$Y[$i] = self::getProduct(self::getBitXor($Y[$i - 1], mb_substr($X, ($i - 1) * 16, 16, '8bit')), $H);
306			}
307
308			return $Y[$num_blocks];
309			}
310
311			/**
312			* @param string $K
313			* @param string $ICB
314			* @param string $X
315			*
316			* @return string
317			*/
318			private static function getGCTR($K, $ICB, $X)
319			{
320			if (empty($X)) {
321			return '';
322			}
323
324			$n = (int) ceil(self::getLength($X) / 128);
325			$CB = [];
326			$Y = [];
327			$CB[1] = $ICB;
328			for ($i = 2; $i <= $n; $i++) {
329			$CB[$i] = self::getInc(32, $CB[$i - 1]);
330			}
331			$key_length = strlen($K) * 8;
332			$mode = 'aes-'.($key_length).'-ecb';
333			for ($i = 1; $i < $n; $i++) {
334			$C = openssl_encrypt($CB[$i], $mode, $K, OPENSSL_NO_PADDING \| OPENSSL_RAW_DATA);
335			$Y[$i] = self::getBitXor(mb_substr($X, ($i - 1) * 16, 16, '8bit'), $C);
336			}
337
338			$Xn = mb_substr($X, ($n - 1) * 16, null, '8bit');
339			$C = openssl_encrypt($CB[$n], $mode, $K, OPENSSL_NO_PADDING \| OPENSSL_RAW_DATA);
340			$Y[$n] = self::getBitXor($Xn, self::getMSB(self::getLength($Xn), $C));
341
342			return implode('', $Y);
343			}
344
345			/**
346			* @param string $o1
347			* @param string $o2
348			*
349			* @return string
350			*/
351			private static function getBitXor($o1, $o2)
352			{
353			$xorWidth = PHP_INT_SIZE;
354			$o1 = str_split($o1, $xorWidth);
355			$o2 = str_split($o2, $xorWidth);
356			$res = '';
357			$runs = count($o1);
358			for ($i = 0; $i < $runs; $i++) {
359			$res .= $o1[$i] ^ $o2[$i];
360			}
361
362			return $res;
363			}
364			}
365

Spomky-Labs / php-aes-gcm

Push — master ( b8db86...b90281 )

AESGCM::encryptAndAppendTag() A

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