ref: 2e23780d2f4f1e3a55a096227a01995d0f0c2e52
parent: 47f07b2669e74eb957db56befa2237df5afa8474
author: cinap_lenrek <[email protected]>
date: Thu Jan 12 15:16:38 EST 2017
libsec: implement extended 192-bit nonce xchacha variant and hchacha function
--- a/sys/include/ape/libsec.h
+++ b/sys/include/ape/libsec.h
@@ -101,6 +101,7 @@
ChachaBsize= 64,
ChachaKeylen= 256/8,
ChachaIVlen= 96/8,
+ XChachaIVlen= 192/8,
};
typedef struct Chachastate Chachastate;
@@ -115,6 +116,7 @@
u32int iv[3];
};
};
+ u32int xkey[8];
int rounds;
int ivwords;
};
@@ -125,6 +127,8 @@
void chacha_encrypt(uchar*, ulong, Chachastate*);
void chacha_encrypt2(uchar*, uchar*, ulong, Chachastate*);
+void hchacha(uchar h[32], uchar *key, ulong keylen, uchar nonce[16], int rounds);
+
void ccpoly_encrypt(uchar *dat, ulong ndat, uchar *aad, ulong naad, uchar tag[16], Chachastate *cs);
int ccpoly_decrypt(uchar *dat, ulong ndat, uchar *aad, ulong naad, uchar tag[16], Chachastate *cs);
@@ -143,7 +147,7 @@
struct Salsastate
{u32int input[16];
- u32int key[8];
+ u32int xkey[8];
int rounds;
int ivwords;
};
--- a/sys/include/libsec.h
+++ b/sys/include/libsec.h
@@ -93,6 +93,7 @@
ChachaBsize= 64,
ChachaKeylen= 256/8,
ChachaIVlen= 96/8,
+ XChachaIVlen= 192/8,
};
typedef struct Chachastate Chachastate;
@@ -107,6 +108,7 @@
u32int iv[3];
};
};
+ u32int xkey[8];
int rounds;
int ivwords;
};
@@ -117,6 +119,8 @@
void chacha_encrypt(uchar*, ulong, Chachastate*);
void chacha_encrypt2(uchar*, uchar*, ulong, Chachastate*);
+void hchacha(uchar h[32], uchar *key, ulong keylen, uchar nonce[16], int rounds);
+
void ccpoly_encrypt(uchar *dat, ulong ndat, uchar *aad, ulong naad, uchar tag[16], Chachastate *cs);
int ccpoly_decrypt(uchar *dat, ulong ndat, uchar *aad, ulong naad, uchar tag[16], Chachastate *cs);
@@ -135,7 +139,7 @@
struct Salsastate
{u32int input[16];
- u32int key[8];
+ u32int xkey[8];
int rounds;
int ivwords;
};
--- a/sys/man/2/chacha
+++ b/sys/man/2/chacha
@@ -1,6 +1,6 @@
.TH CHACHA 2
.SH NAME
-setupChachastate, chacha_setblock, chacha_setiv, chacha_encrypt, chacha_encrypt2, ccpoly_encrypt, ccpoly_decrypt \- chacha encryption
+setupChachastate, chacha_setblock, chacha_setiv, chacha_encrypt, chacha_encrypt2, hchacha, ccpoly_encrypt, ccpoly_decrypt \- chacha encryption
.SH SYNOPSIS
.B #include <u.h>
.br
@@ -24,6 +24,9 @@
void chacha_setiv(Chachastate *s, uchar *iv);
.PP
.B
+void hchacha(uchar h[32], uchar *key, ulong keylen, uchar nonce[16], int rounds);
+.PP
+.B
void ccpoly_encrypt(uchar *dat, ulong ndat, uchar *aad, ulong naad, uchar tag[16], Chachastate *cs);
.PP
.B
@@ -49,8 +52,11 @@
or nonce of
.I ivlen
bytes (can be
-.BR ChachaIVlen =12
-or 8, set to all zeros if the
+.BR ChachaIVlen =12 ,
+.B 8
+or
+.BR XChachaIVlen =24 ;
+set to all zeros if the
.I iv
argument is nil),
and the number of
@@ -93,6 +99,10 @@
.I Chacha_setiv
sets the the initialization vector (nonce) to
.IR iv .
+.PP
+.I Hchacha
+is a key expansion function that takes a 128 or 256-bit key
+and a 128-bit nonce and produces a new 256-bit key.
.PP
.I Ccpoly_encrypt
and
--- a/sys/src/libsec/port/chacha.c
+++ b/sys/src/libsec/port/chacha.c
@@ -57,7 +57,8 @@
{if(keylen != 256/8 && keylen != 128/8)
sysfatal("invalid chacha key length");- if(ivlen != 96/8 && ivlen != 64/8)
+ if(ivlen != 64/8 && ivlen != 96/8
+ && ivlen != 128/8 && ivlen != 192/8) /* hchacha, xchacha */
sysfatal("invalid chacha iv length");if(rounds == 0)
rounds = 20;
@@ -70,7 +71,16 @@
load(&s->input[4], key, 4);
load(&s->input[8], key, 4);
}
- s->ivwords = ivlen/sizeof(u32int);
+ s->xkey[0] = s->input[4];
+ s->xkey[1] = s->input[5];
+ s->xkey[2] = s->input[6];
+ s->xkey[3] = s->input[7];
+ s->xkey[4] = s->input[8];
+ s->xkey[5] = s->input[9];
+ s->xkey[6] = s->input[10];
+ s->xkey[7] = s->input[11];
+
+ s->ivwords = ivlen/4;
s->input[12] = 0;
s->input[13] = 0;
if(iv == nil){@@ -80,20 +90,6 @@
chacha_setiv(s, iv);
}
-void
-chacha_setiv(Chachastate *s, uchar *iv)
-{- load(&s->input[16 - s->ivwords], iv, s->ivwords);
-}
-
-void
-chacha_setblock(Chachastate *s, u64int blockno)
-{- s->input[12] = blockno;
- if(s->ivwords == 2)
- s->input[13] = blockno>>32;
-}
-
static void
dorounds(u32int x[Blockwords], int rounds)
{@@ -111,6 +107,83 @@
}
static void
+hchachablock(uchar h[32], Chachastate *s)
+{+ u32int x[16];
+
+ x[0] = s->input[0];
+ x[1] = s->input[1];
+ x[2] = s->input[2];
+ x[3] = s->input[3];
+ x[4] = s->input[4];
+ x[5] = s->input[5];
+ x[6] = s->input[6];
+ x[7] = s->input[7];
+ x[8] = s->input[8];
+ x[9] = s->input[9];
+ x[10] = s->input[10];
+ x[11] = s->input[11];
+ x[12] = s->input[12];
+ x[13] = s->input[13];
+ x[14] = s->input[14];
+ x[15] = s->input[15];
+
+ dorounds(x, s->rounds);
+
+ PUT4(h+0*4, x[0]);
+ PUT4(h+1*4, x[1]);
+ PUT4(h+2*4, x[2]);
+ PUT4(h+3*4, x[3]);
+ PUT4(h+4*4, x[12]);
+ PUT4(h+5*4, x[13]);
+ PUT4(h+6*4, x[14]);
+ PUT4(h+7*4, x[15]);
+}
+
+void
+chacha_setiv(Chachastate *s, uchar *iv)
+{+ if(s->ivwords == 192/32){+ /* xchacha with 192-bit iv */
+ u32int counter[2];
+ uchar h[32];
+
+ s->input[4] = s->xkey[0];
+ s->input[5] = s->xkey[1];
+ s->input[6] = s->xkey[2];
+ s->input[7] = s->xkey[3];
+ s->input[8] = s->xkey[4];
+ s->input[9] = s->xkey[5];
+ s->input[10] = s->xkey[6];
+ s->input[11] = s->xkey[7];
+
+ counter[0] = s->input[12];
+ counter[1] = s->input[13];
+
+ load(&s->input[12], iv, 4);
+
+ hchachablock(h, s);
+ load(&s->input[4], h, 8);
+ memset(h, 0, 32);
+
+ s->input[12] = counter[0];
+ s->input[13] = counter[1];
+
+ load(&s->input[14], iv+16, 2);
+ return;
+ }
+ load(&s->input[16 - s->ivwords], iv, s->ivwords);
+}
+
+void
+chacha_setblock(Chachastate *s, u64int blockno)
+{+ s->input[12] = blockno;
+ if(s->ivwords != 3)
+ s->input[13] = blockno>>32;
+}
+
+static void
encryptblock(Chachastate *s, uchar *src, uchar *dst)
{u32int x[Blockwords];
@@ -143,7 +216,7 @@
dst += 16;
}
- if(++s->input[12] == 0 && s->ivwords == 2)
+ if(++s->input[12] == 0 && s->ivwords != 3)
s->input[13]++;
}
@@ -168,4 +241,14 @@
chacha_encrypt(uchar *buf, ulong bytes, Chachastate *s)
{chacha_encrypt2(buf, buf, bytes, s);
+}
+
+void
+hchacha(uchar h[32], uchar *key, ulong keylen, uchar nonce[16], int rounds)
+{+ Chachastate s[1];
+
+ setupChachastate(s, key, keylen, nonce, 16, rounds);
+ hchachablock(h, s);
+ memset(s, 0, sizeof(s));
}
--- a/sys/src/libsec/port/chachatest.c
+++ b/sys/src/libsec/port/chachatest.c
@@ -42,6 +42,26 @@
0x87, 0x4d
};
+uchar xcckey[] = {+ 0x1b, 0x27, 0x55, 0x64, 0x73, 0xe9, 0x85, 0xd4, 0x62, 0xcd, 0x51, 0x19, 0x7a, 0x9a, 0x46, 0xc7,
+ 0x60, 0x09, 0x54, 0x9e, 0xac, 0x64, 0x74, 0xf2, 0x06, 0xc4, 0xee, 0x08, 0x44, 0xf6, 0x83, 0x89,
+};
+uchar xcciv[] = {+ 0x69, 0x69, 0x6e, 0xe9, 0x55, 0xb6, 0x2b, 0x73, 0xcd, 0x62, 0xbd, 0xa8, 0x75, 0xfc, 0x73, 0xd6,
+ 0x82, 0x19, 0xe0, 0x03, 0x6b, 0x7a, 0x0b, 0x37,
+};
+uchar xccref[] = {+ 0x4f, 0xeb, 0xf2, 0xfe, 0x4b, 0x35, 0x9c, 0x50, 0x8d, 0xc5, 0xe8, 0xb5, 0x98, 0x0c, 0x88, 0xe3,
+ 0x89, 0x46, 0xd8, 0xf1, 0x8f, 0x31, 0x34, 0x65, 0xc8, 0x62, 0xa0, 0x87, 0x82, 0x64, 0x82, 0x48,
+ 0x01, 0x8d, 0xac, 0xdc, 0xb9, 0x04, 0x17, 0x88, 0x53, 0xa4, 0x6d, 0xca, 0x3a, 0x0e, 0xaa, 0xee,
+ 0x74, 0x7c, 0xba, 0x97, 0x43, 0x4e, 0xaf, 0xfa, 0xd5, 0x8f, 0xea, 0x82, 0x22, 0x04, 0x7e, 0x0d,
+ 0xe6, 0xc3, 0xa6, 0x77, 0x51, 0x06, 0xe0, 0x33, 0x1a, 0xd7, 0x14, 0xd2, 0xf2, 0x7a, 0x55, 0x64,
+ 0x13, 0x40, 0xa1, 0xf1, 0xdd, 0x9f, 0x94, 0x53, 0x2e, 0x68, 0xcb, 0x24, 0x1c, 0xbd, 0xd1, 0x50,
+ 0x97, 0x0d, 0x14, 0xe0, 0x5c, 0x5b, 0x17, 0x31, 0x93, 0xfb, 0x14, 0xf5, 0x1c, 0x41, 0xf3, 0x93,
+ 0x83, 0x5b, 0xf7, 0xf4, 0x16, 0xa7, 0xe0, 0xbb, 0xa8, 0x1f, 0xfb, 0x8b, 0x13, 0xaf, 0x0e, 0x21,
+ 0x69, 0x1d, 0x7e, 0xce, 0xc9, 0x3b, 0x75, 0xe6, 0xe4, 0x18, 0x3a,
+};
+
uchar ccpaad[] = {0x50, 0x51, 0x52, 0x53, 0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7,
};
@@ -103,6 +123,26 @@
}
print("\n");+
+ print("xchacha key:\n");+ printblock(xcckey, sizeof(xcckey));
+
+ print("xchacha iv:\n");+ printblock(xcciv, sizeof(xcciv));
+
+ setupChachastate(&s, xcckey, sizeof(xcckey), xcciv, sizeof(xcciv), 20);
+ memset(rfcout, 0, sizeof(xccref));
+ chacha_encrypt(rfcout, sizeof(xccref), &s);
+
+ print("xchacha out:\n");+ printblock(rfcout, sizeof(xccref));
+ if(memcmp(rfcout, xccref, sizeof(xccref)) != 0){+ print("failure of vision\n");+ exits("wrong");+ }
+ print("\n");+
+
print("ccpoly key:\n");printblock(ccpkey, sizeof(ccpkey));
@@ -135,6 +175,7 @@
exits("wrong");}
print("\n");+
print("ccpoly64 key:\n");printblock(ccp64key, sizeof(ccp64key));
--- a/sys/src/libsec/port/salsa.c
+++ b/sys/src/libsec/port/salsa.c
@@ -34,7 +34,8 @@
{if(keylen != 256/8 && keylen != 128/8)
sysfatal("invalid salsa key length");- if(ivlen != 64/8 && ivlen != 128/8 && ivlen != 192/8)
+ if(ivlen != 64/8
+ && ivlen != 128/8 && ivlen != 192/8) /* hsalsa, xsalsa */
sysfatal("invalid salsa iv length");if(rounds == 0)
rounds = 20;
@@ -54,14 +55,14 @@
load(&s->input[11], key, 4);
load(&s->input[15], tau +4*3, 1);
}
- s->key[0] = s->input[1];
- s->key[1] = s->input[2];
- s->key[2] = s->input[3];
- s->key[3] = s->input[4];
- s->key[4] = s->input[11];
- s->key[5] = s->input[12];
- s->key[6] = s->input[13];
- s->key[7] = s->input[14];
+ s->xkey[0] = s->input[1];
+ s->xkey[1] = s->input[2];
+ s->xkey[2] = s->input[3];
+ s->xkey[3] = s->input[4];
+ s->xkey[4] = s->input[11];
+ s->xkey[5] = s->input[12];
+ s->xkey[6] = s->input[13];
+ s->xkey[7] = s->input[14];
s->ivwords = ivlen/4;
s->input[8] = 0;
@@ -152,7 +153,7 @@
salsa_setiv(Salsastate *s, uchar *iv)
{ if(s->ivwords == 128/32){- /* hsalsa 128-bit iv */
+ /* hsalsa with 128-bit iv */
load(&s->input[6], iv, 4);
return;
}
@@ -164,14 +165,14 @@
counter[0] = s->input[8];
counter[1] = s->input[9];
- s->input[1] = s->key[0];
- s->input[2] = s->key[1];
- s->input[3] = s->key[2];
- s->input[4] = s->key[3];
- s->input[11] = s->key[4];
- s->input[12] = s->key[5];
- s->input[13] = s->key[6];
- s->input[14] = s->key[7];
+ s->input[1] = s->xkey[0];
+ s->input[2] = s->xkey[1];
+ s->input[3] = s->xkey[2];
+ s->input[4] = s->xkey[3];
+ s->input[11] = s->xkey[4];
+ s->input[12] = s->xkey[5];
+ s->input[13] = s->xkey[6];
+ s->input[14] = s->xkey[7];
load(&s->input[6], iv, 4);