Fully managed .NET AES implementation (based on AES-NI)

Do not use this in production! This is a toy project to explore System.Runtime.Intrinsics and AES-NI

Currently with support for ECB, CBC and GCM encrypt/decrypt (all NIST KATs passing). Adding all sorts of paddings is also supported, removing & verifying it is on my todo list... Other modes of use may follow as well.

AES key expansion performance

Method	Mean	Error	StdDev
Aes128BitKeyExpansion	35.91 ns	0.6520 ns	0.6099 ns
Aes192BitKeyExpansion	47.13 ns	0.7675 ns	0.6804 ns
Aes256BitKeyExpansion	42.32 ns	0.9240 ns	0.9887 ns

AES GCM encrypt performance

Method	KeySize	DataSize	AadDataSize	Mean	Error	Ratio
AesNi	128	16	0	116.9 ns	0.9230 ns	0.59
Framework	128	16	0	196.7 ns	0.2843 ns	1.00
AesNi	128	16	16	125.9 ns	0.7349 ns	0.60
Framework	128	16	16	209.8 ns	1.3427 ns	1.00
AesNi	128	16	1024	363.3 ns	1.4387 ns	1.02
Framework	128	16	1024	357.8 ns	1.2221 ns	1.00
AesNi	128	16	1048576	251,047.3 ns	635.6994 ns	1.69
Framework	128	16	1048576	148,721.9 ns	328.4326 ns	1.00
AesNi	128	1024	0	513.7 ns	1.6526 ns	1.08
Framework	128	1024	0	475.1 ns	1.6877 ns	1.00
AesNi	128	1024	16	515.3 ns	1.3066 ns	1.09
Framework	128	1024	16	472.2 ns	2.3596 ns	1.00
AesNi	128	1024	1024	766.6 ns	1.5603 ns	1.21
Framework	128	1024	1024	635.7 ns	2.5873 ns	1.00
AesNi	128	1024	1048576	259,308.8 ns	1,252.8282 ns	1.70
Framework	128	1024	1048576	152,773.2 ns	851.4720 ns	1.00
AesNi	128	1048576	0	422,961.0 ns	2,256.4577 ns	1.59
Framework	128	1048576	0	266,618.2 ns	422.4311 ns	1.00
AesNi	128	1048576	16	424,680.1 ns	3,185.9390 ns	1.59
Framework	128	1048576	16	267,013.1 ns	1,777.2603 ns	1.00
AesNi	128	1048576	1024	434,743.8 ns	4,371.0678 ns	1.59
Framework	128	1048576	1024	273,610.6 ns	450.4404 ns	1.00
AesNi	128	1048576	1048576	689,697.7 ns	868.5420 ns	1.64
Framework	128	1048576	1048576	421,531.7 ns	3,582.6085 ns	1.00
AesNi	192	16	0	143.6 ns	0.5633 ns	0.74
Framework	192	16	0	192.9 ns	0.6242 ns	1.00
AesNi	192	16	16	153.1 ns	0.7294 ns	0.73
Framework	192	16	16	210.9 ns	0.4006 ns	1.00
AesNi	192	16	1024	400.2 ns	0.8833 ns	1.12
Framework	192	16	1024	356.8 ns	0.6916 ns	1.00
AesNi	192	16	1048576	250,448.8 ns	394.2873 ns	1.69
Framework	192	16	1048576	148,382.0 ns	290.7987 ns	1.00
AesNi	192	1024	0	568.1 ns	1.1216 ns	1.16
Framework	192	1024	0	487.6 ns	6.0360 ns	1.00
AesNi	192	1024	16	578.4 ns	1.1946 ns	1.16
Framework	192	1024	16	499.8 ns	1.7812 ns	1.00
AesNi	192	1024	1024	807.0 ns	1.3291 ns	1.25
Framework	192	1024	1024	643.6 ns	1.8400 ns	1.00
AesNi	192	1024	1048576	262,869.2 ns	943.2716 ns	1.73
Framework	192	1024	1048576	152,335.9 ns	935.3822 ns	1.00
AesNi	192	1048576	0	438,345.8 ns	1,060.3746 ns	1.57
Framework	192	1048576	0	278,631.5 ns	486.4308 ns	1.00
AesNi	192	1048576	16	442,616.3 ns	547.3178 ns	1.55
Framework	192	1048576	16	286,545.5 ns	1,512.6367 ns	1.00
AesNi	192	1048576	1024	450,771.3 ns	676.5289 ns	1.55
Framework	192	1048576	1024	290,664.8 ns	391.3501 ns	1.00
AesNi	192	1048576	1048576	686,396.4 ns	14,703.2507 ns	1.56
Framework	192	1048576	1048576	441,713.9 ns	494.7152 ns	1.00
AesNi	256	16	0	141.9 ns	0.3664 ns	0.71
Framework	256	16	0	198.5 ns	0.2866 ns	1.00
AesNi	256	16	16	156.5 ns	0.5802 ns	0.74
Framework	256	16	16	210.5 ns	0.9646 ns	1.00
AesNi	256	16	1024	400.8 ns	7.5786 ns	1.13
Framework	256	16	1024	355.9 ns	1.5194 ns	1.00
AesNi	256	16	1048576	247,994.4 ns	1,455.3164 ns	1.69
Framework	256	16	1048576	146,328.1 ns	1,307.2082 ns	1.00
AesNi	256	1024	0	544.0 ns	2.3217 ns	1.08
Framework	256	1024	0	502.1 ns	5.9181 ns	1.00
AesNi	256	1024	16	583.3 ns	6.9148 ns	1.13
Framework	256	1024	16	517.3 ns	4.6781 ns	1.00
AesNi	256	1024	1024	835.2 ns	12.4978 ns	1.32
Framework	256	1024	1024	634.3 ns	4.9952 ns	1.00
AesNi	256	1024	1048576	249,924.6 ns	1,841.8605 ns	1.68
Framework	256	1024	1048576	148,455.3 ns	458.4788 ns	1.00
AesNi	256	1048576	0	442,180.1 ns	4,221.1879 ns	1.52
Framework	256	1048576	0	291,458.2 ns	3,763.9204 ns	1.00
AesNi	256	1048576	16	438,106.3 ns	5,505.4349 ns	1.48
Framework	256	1048576	16	295,714.9 ns	2,600.2403 ns	1.00
AesNi	256	1048576	1024	456,180.5 ns	4,805.1506 ns	1.63
Framework	256	1048576	1024	280,266.8 ns	3,468.0828 ns	1.00
AesNi	256	1048576	1048576	689,585.6 ns	5,874.2785 ns	1.63
Framework	256	1048576	1048576	424,188.0 ns	2,975.6839 ns	1.00

AES encrypt performance

Method	CipherMode	KeySize	DataSize	Mean	Error	Ratio
AesNi	CBC	128	16	51.48 ns	0.1573 ns	0.67
Framework	CBC	128	16	77.08 ns	0.5826 ns	1.00
AesNi	CBC	128	1024	693.96 ns	1.4697 ns	0.92
Framework	CBC	128	1024	752.54 ns	4.9276 ns	1.00
AesNi	CBC	128	1048576	698,223.91 ns	1,881.7810 ns	0.98
Framework	CBC	128	1048576	711,672.78 ns	4,434.7702 ns	1.00
AesNi	CBC	192	16	58.98 ns	0.4968 ns	0.71
Framework	CBC	192	16	82.70 ns	0.6663 ns	1.00
AesNi	CBC	192	1024	862.64 ns	1.0201 ns	0.93
Framework	CBC	192	1024	926.99 ns	2.3510 ns	1.00
AesNi	CBC	192	1048576	842,651.03 ns	4,075.8823 ns	0.99
Framework	CBC	192	1048576	853,973.89 ns	917.3084 ns	1.00
AesNi	CBC	256	16	58.53 ns	0.1174 ns	0.70
Framework	CBC	256	16	83.33 ns	0.4332 ns	1.00
AesNi	CBC	256	1024	859.57 ns	7.9029 ns	0.85
Framework	CBC	256	1024	1,016.35 ns	2.2197 ns	1.00
AesNi	CBC	256	1048576	835,345.80 ns	8,567.1241 ns	0.82
Framework	CBC	256	1048576	1,020,803.67 ns	2,502.8008 ns	1.00
AesNi	ECB	128	16	45.14 ns	0.1515 ns	0.58
Framework	ECB	128	16	77.69 ns	0.1875 ns	1.00
AesNi	ECB	128	1024	132.40 ns	0.4511 ns	0.79
Framework	ECB	128	1024	166.86 ns	1.3364 ns	1.00
AesNi	ECB	128	1048576	141,626.77 ns	198.7224 ns	1.48
Framework	ECB	128	1048576	95,954.07 ns	171.3752 ns	1.00
AesNi	ECB	192	16	51.69 ns	0.0787 ns	0.67
Framework	ECB	192	16	76.63 ns	0.4839 ns	1.00
AesNi	ECB	192	1024	153.73 ns	0.3768 ns	0.83
Framework	ECB	192	1024	185.51 ns	0.3866 ns	1.00
AesNi	ECB	192	1048576	121,029.49 ns	123.5305 ns	1.03
Framework	ECB	192	1048576	117,916.41 ns	511.1359 ns	1.00
AesNi	ECB	256	16	53.39 ns	0.1102 ns	0.67
Framework	ECB	256	16	79.32 ns	1.0731 ns	1.00
AesNi	ECB	256	1024	150.18 ns	0.4052 ns	0.71
Framework	ECB	256	1024	212.85 ns	2.3061 ns	1.00
AesNi	ECB	256	1048576	121,857.20 ns	605.2357 ns	0.89
Framework	ECB	256	1048576	136,291.12 ns	660.5039 ns	1.00

AES decrypt performance

Method	CipherMode	KeySize	DataSize	Mean	Error	Ratio
AesNi	CBC	128	16	40.56 ns	0.3099 ns	0.48
Framework	CBC	128	16	85.17 ns	0.7217 ns	1.00
AesNi	CBC	128	1024	150.37 ns	6.1546 ns	0.82
Framework	CBC	128	1024	189.60 ns	1.9181 ns	1.00
AesNi	CBC	128	1048576	105,309.20 ns	536.4942 ns	0.97
Framework	CBC	128	1048576	108,803.69 ns	670.8807 ns	1.00
AesNi	CBC	192	16	45.69 ns	0.9025 ns	0.54
Framework	CBC	192	16	84.60 ns	0.4631 ns	1.00
AesNi	CBC	192	1024	155.21 ns	1.7375 ns	0.77
Framework	CBC	192	1024	202.52 ns	0.8997 ns	1.00
AesNi	CBC	192	1048576	124,210.60 ns	459.2670 ns	0.99
Framework	CBC	192	1048576	125,101.53 ns	198.4721 ns	1.00
AesNi	CBC	256	16	45.23 ns	0.2512 ns	0.51
Framework	CBC	256	16	89.06 ns	0.7113 ns	1.00
AesNi	CBC	256	1024	155.90 ns	1.9114 ns	0.70
Framework	CBC	256	1024	224.04 ns	2.2041 ns	1.00
AesNi	CBC	256	1048576	127,773.17 ns	3,084.0620 ns	0.90
Framework	CBC	256	1048576	144,033.44 ns	359.6341 ns	1.00
AesNi	ECB	128	16	31.46 ns	0.1889 ns	0.41
Framework	ECB	128	16	76.86 ns	0.3054 ns	1.00
AesNi	ECB	128	1024	111.58 ns	1.0203 ns	0.33
Framework	ECB	128	1024	339.31 ns	3.0097 ns	1.00
AesNi	ECB	128	1048576	139,299.30 ns	476.1600 ns	0.56
Framework	ECB	128	1048576	250,596.04 ns	2,637.1993 ns	1.00
AesNi	ECB	192	16	36.16 ns	0.1581 ns	0.48
Framework	ECB	192	16	75.77 ns	0.5718 ns	1.00
AesNi	ECB	192	1024	134.45 ns	0.7831 ns	0.40
Framework	ECB	192	1024	333.48 ns	5.6652 ns	1.00
AesNi	ECB	192	1048576	162,322.50 ns	954.9279 ns	0.63
Framework	ECB	192	1048576	259,364.61 ns	1,087.2464 ns	1.00
AesNi	ECB	256	16	36.13 ns	0.0700 ns	0.47
Framework	ECB	256	16	76.63 ns	0.7104 ns	1.00
AesNi	ECB	256	1024	133.11 ns	0.4417 ns	0.35
Framework	ECB	256	1024	375.75 ns	0.9654 ns	1.00
AesNi	ECB	256	1048576	161,534.95 ns	905.5891 ns	0.55
Framework	ECB	256	1048576	294,344.69 ns	1,807.6672 ns	1.00