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Add AEAD_CHACHA20_POLY1305

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With a twist: in order to be consistent with the crypto_stream
interface, the tag has to come before the ciphertext.
This commit is contained in:
Frank Denis 2014-06-19 18:44:07 -07:00
parent 9cba9c39e3
commit bd1490a6cd
8 changed files with 294 additions and 0 deletions
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1
.gitignore vendored
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@ -89,6 +89,7 @@ test/default/scalarmult2
test/default/scalarmult5
test/default/scalarmult6
test/default/secretbox
test/default/secretbox_chacha20poly1305
test/default/secretbox2
test/default/secretbox7
test/default/secretbox8

1
src/libsodium/Makefile.am
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@ -71,6 +71,7 @@ libsodium_la_SOURCES = \
crypto_scalarmult/curve25519/scalarmult_curve25519_api.c \
crypto_secretbox/crypto_secretbox.c \
crypto_secretbox/crypto_secretbox_easy.c \
crypto_secretbox/chacha20poly1305/secretbox_chacha20poly1305.c \
crypto_secretbox/xsalsa20poly1305/secretbox_xsalsa20poly1305_api.c \
crypto_secretbox/xsalsa20poly1305/ref/api.h \
crypto_secretbox/xsalsa20poly1305/ref/box_xsalsa20poly1305.c \

149
src/libsodium/crypto_secretbox/chacha20poly1305/secretbox_chacha20poly1305.c Normal file
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@ -0,0 +1,149 @@
#include <string.h>
#include "crypto_onetimeauth_poly1305.h"
#include "crypto_secretbox_chacha20poly1305.h"
#include "crypto_stream_chacha20.h"
#include "crypto_verify_16.h"
#include "utils.h"
static inline void
_u64_le_from_ull(unsigned char out[8U], unsigned long long x)
{
out[0] = (unsigned char) (x & 0xff); x >>= 8;
out[1] = (unsigned char) (x & 0xff); x >>= 8;
out[2] = (unsigned char) (x & 0xff); x >>= 8;
out[3] = (unsigned char) (x & 0xff); x >>= 8;
out[4] = (unsigned char) (x & 0xff); x >>= 8;
out[5] = (unsigned char) (x & 0xff); x >>= 8;
out[6] = (unsigned char) (x & 0xff); x >>= 8;
out[7] = (unsigned char) (x & 0xff);
}
int
crypto_secretbox_chacha20poly1305_ad(unsigned char *c,
const unsigned char *m,
unsigned long long mlen,
const unsigned char *ad,
unsigned long long adlen,
const unsigned char *n,
const unsigned char *k)
{
crypto_onetimeauth_poly1305_state state;
unsigned char block0[64U];
unsigned char slen[8U];
crypto_stream_chacha20_xor_ic
(c + crypto_secretbox_chacha20poly1305_ZEROBYTES, m, mlen, n, 1U, k);
crypto_stream_chacha20(block0, sizeof block0, n, k);
crypto_onetimeauth_poly1305_init(&state, block0);
sodium_memzero(block0, sizeof block0);
crypto_onetimeauth_poly1305_update(&state, ad, adlen);
_u64_le_from_ull(slen, adlen);
crypto_onetimeauth_poly1305_update(&state, slen, sizeof slen);
crypto_onetimeauth_poly1305_update
(&state, c + crypto_secretbox_chacha20poly1305_ZEROBYTES, mlen);
_u64_le_from_ull(slen, mlen);
crypto_onetimeauth_poly1305_update(&state, slen, sizeof slen);
crypto_onetimeauth_poly1305_final(&state, c);
return 0;
}
int
crypto_secretbox_chacha20poly1305(unsigned char *c,
const unsigned char *m,
unsigned long long mlen,
const unsigned char *n,
const unsigned char *k)
{
return crypto_secretbox_chacha20poly1305_ad(c, m, mlen, NULL, 0ULL, n, k);
}
int
crypto_secretbox_chacha20poly1305_ad_open(unsigned char *m,
const unsigned char *c,
unsigned long long clen,
const unsigned char *ad,
unsigned long long adlen,
const unsigned char *n,
const unsigned char *k)
{
crypto_onetimeauth_poly1305_state state;
unsigned char block0[64U];
unsigned char slen[8U];
unsigned char mac[crypto_secretbox_chacha20poly1305_MACBYTES];
int ret;
if (clen < crypto_secretbox_chacha20poly1305_ZEROBYTES) {
return -1;
}
crypto_stream_chacha20(block0, sizeof block0, n, k);
crypto_onetimeauth_poly1305_init(&state, block0);
sodium_memzero(block0, sizeof block0);
crypto_onetimeauth_poly1305_update(&state, ad, adlen);
_u64_le_from_ull(slen, adlen);
crypto_onetimeauth_poly1305_update(&state, slen, sizeof slen);
crypto_onetimeauth_poly1305_update
(&state, c + crypto_secretbox_chacha20poly1305_ZEROBYTES,
clen - crypto_secretbox_chacha20poly1305_ZEROBYTES);
_u64_le_from_ull(slen, clen - crypto_secretbox_chacha20poly1305_ZEROBYTES);
crypto_onetimeauth_poly1305_update(&state, slen, sizeof slen);
crypto_onetimeauth_poly1305_final(&state, mac);
ret = crypto_verify_16(mac, c);
sodium_memzero(mac, sizeof mac);
if (ret != 0) {
memset(m, 0, clen - crypto_secretbox_chacha20poly1305_ZEROBYTES);
return -1;
}
crypto_stream_chacha20_xor_ic
(m, c + crypto_secretbox_chacha20poly1305_ZEROBYTES,
clen - crypto_secretbox_chacha20poly1305_ZEROBYTES, n, 1U, k);
return 0;
}
int
crypto_secretbox_chacha20poly1305_open(unsigned char *m,
const unsigned char *c,
unsigned long long clen,
const unsigned char *n,
const unsigned char *k)
{
return crypto_secretbox_chacha20poly1305_ad_open(m, c, clen,
NULL, 0ULL, n, k);
}
size_t
crypto_secretbox_chacha20poly1305_keybytes(void) {
return crypto_secretbox_chacha20poly1305_KEYBYTES;
}
size_t
crypto_secretbox_chacha20poly1305_noncebytes(void) {
return crypto_secretbox_chacha20poly1305_NONCEBYTES;
}
size_t
crypto_secretbox_chacha20poly1305_zerobytes(void) {
return crypto_secretbox_chacha20poly1305_ZEROBYTES;
}
size_t
crypto_secretbox_chacha20poly1305_boxzerobytes(void) {
return crypto_secretbox_chacha20poly1305_BOXZEROBYTES;
}
size_t
crypto_secretbox_chacha20poly1305_macbytes(void) {
return crypto_secretbox_chacha20poly1305_MACBYTES;
}

1
src/libsodium/include/Makefile.am
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@ -23,6 +23,7 @@ SODIUM_EXPORT = \
sodium/crypto_scalarmult.h \
sodium/crypto_scalarmult_curve25519.h \
sodium/crypto_secretbox.h \
sodium/crypto_secretbox_chacha20poly1305.h \
sodium/crypto_secretbox_xsalsa20poly1305.h \
sodium/crypto_shorthash.h \
sodium/crypto_shorthash_siphash24.h \

1
src/libsodium/include/sodium.h
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@ -24,6 +24,7 @@
#include <sodium/crypto_scalarmult.h>
#include <sodium/crypto_scalarmult_curve25519.h>
#include <sodium/crypto_secretbox.h>
#include <sodium/crypto_secretbox_chacha20poly1305.h>
#include <sodium/crypto_secretbox_xsalsa20poly1305.h>
#include <sodium/crypto_shorthash.h>
#include <sodium/crypto_shorthash_siphash24.h>

72
src/libsodium/include/sodium/crypto_secretbox_chacha20poly1305.h Normal file
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@ -0,0 +1,72 @@
#ifndef crypto_secretbox_chacha20poly1305_H
#define crypto_secretbox_chacha20poly1305_H
#include <stddef.h>
#include "export.h"
#ifdef __cplusplus
# if __GNUC__
# pragma GCC diagnostic ignored "-Wlong-long"
# endif
extern "C" {
#endif
#define crypto_secretbox_chacha20poly1305_KEYBYTES 32U
SODIUM_EXPORT
size_t crypto_secretbox_chacha20poly1305_keybytes(void);
#define crypto_secretbox_chacha20poly1305_NONCEBYTES 8U
SODIUM_EXPORT
size_t crypto_secretbox_chacha20poly1305_noncebytes(void);
#define crypto_secretbox_chacha20poly1305_ZEROBYTES 16U
SODIUM_EXPORT
size_t crypto_secretbox_chacha20poly1305_zerobytes(void);
#define crypto_secretbox_chacha20poly1305_BOXZEROBYTES 0U
SODIUM_EXPORT
size_t crypto_secretbox_chacha20poly1305_boxzerobytes(void);
#define crypto_secretbox_chacha20poly1305_MACBYTES \
(crypto_secretbox_chacha20poly1305_ZEROBYTES - \
crypto_secretbox_chacha20poly1305_BOXZEROBYTES)
SODIUM_EXPORT
size_t crypto_secretbox_chacha20poly1305_macbytes(void);
SODIUM_EXPORT
int crypto_secretbox_chacha20poly1305(unsigned char *c,
const unsigned char *m,
unsigned long long mlen,
const unsigned char *n,
const unsigned char *k);
SODIUM_EXPORT
int crypto_secretbox_chacha20poly1305_open(unsigned char *m,
const unsigned char *c,
unsigned long long clen,
const unsigned char *n,
const unsigned char *k);
SODIUM_EXPORT
int crypto_secretbox_chacha20poly1305_ad(unsigned char *c,
const unsigned char *m,
unsigned long long mlen,
const unsigned char *ad,
unsigned long long adlen,
const unsigned char *n,
const unsigned char *k);
SODIUM_EXPORT
int crypto_secretbox_chacha20poly1305_ad_open(unsigned char *m,
const unsigned char *c,
unsigned long long clen,
const unsigned char *ad,
unsigned long long adlen,
const unsigned char *n,
const unsigned char *k);
#ifdef __cplusplus
}
#endif
#endif

6
test/default/Makefile.am
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@ -38,6 +38,7 @@ EXTRA_DIST = \
scalarmult5.exp \
scalarmult6.exp \
secretbox.exp \
secretbox_chacha20poly1305.exp \
secretbox2.exp \
secretbox7.exp \
secretbox8.exp \
@ -93,6 +94,7 @@ DISTCLEANFILES = \
scalarmult5.res \
scalarmult6.res \
secretbox.res \
secretbox_chacha20poly1305.res \
secretbox2.res \
secretbox7.res \
secretbox8.res \
@ -156,6 +158,7 @@ TESTS_TARGETS = \
scalarmult5 \
scalarmult6 \
secretbox \
secretbox_chacha20poly1305 \
secretbox2 \
secretbox7 \
secretbox8 \
@ -289,6 +292,9 @@ scalarmult6_LDADD = $(TESTS_LDADD)
secretbox_SOURCE = cmptest.h secretbox.c
secretbox_LDADD = $(TESTS_LDADD)
secretbox_chacha20poly1305_SOURCE = cmptest.h secretbox_chacha20poly1305.c
secretbox_chacha20poly1305_LDADD = $(TESTS_LDADD)
secretbox2_SOURCE = cmptest.h secretbox2.c
secretbox2_LDADD = $(TESTS_LDADD)

63
test/default/secretbox_chacha20poly1305.c Normal file
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@ -0,0 +1,63 @@
#include <stdio.h>
#include <string.h>
#define TEST_NAME "secretbox_chacha20poly1305"
#include "cmptest.h"
static unsigned char firstkey[crypto_secretbox_chacha20poly1305_KEYBYTES] = {
0x42, 0x90, 0xbc, 0xb1, 0x54, 0x17, 0x35, 0x31,
0xf3, 0x14, 0xaf, 0x57, 0xf3, 0xbe, 0x3b, 0x50,
0x06, 0xda, 0x37, 0x1e, 0xce, 0x27, 0x2a, 0xfa,
0x1b, 0x5d, 0xbd, 0xd1, 0x10, 0x0a, 0x10, 0x07
};
static unsigned char m[10U] = {
0x86, 0xd0, 0x99, 0x74, 0x84, 0x0b, 0xde, 0xd2, 0xa5, 0xca
};
static unsigned char nonce[crypto_secretbox_chacha20poly1305_NONCEBYTES] = {
0xcd, 0x7c, 0xf6, 0x7b, 0xe3, 0x9c, 0x79, 0x4a
};
static unsigned char ad[10U] = {
0x87, 0xe2, 0x29, 0xd4, 0x50, 0x08, 0x45, 0xa0, 0x79, 0xc0
};
static unsigned char c[10U + crypto_secretbox_chacha20poly1305_ZEROBYTES];
int main(void)
{
unsigned char m2[10U];
size_t i;
crypto_secretbox_chacha20poly1305_ad(c, m, sizeof m, ad, sizeof ad,
nonce, firstkey);
for (i = 0U; i < sizeof c; ++i) {
printf(",0x%02x", (unsigned int) c[i]);
if (i % 8 == 7) {
printf("\n");
}
}
printf("\n");
if (crypto_secretbox_chacha20poly1305_ad_open(m2, c, sizeof c,
ad, sizeof ad,
nonce, firstkey) != 0) {
printf("crypto_secretbox_chacha20poly1305_ad_open() failed\n");
}
if (memcmp(m, m2, sizeof m) != 0) {
printf("m != m2\n");
}
for (i = 0U; i < sizeof c; i++) {
c[i] ^= (i + 1U);
if (crypto_secretbox_chacha20poly1305_ad_open(m2, c, sizeof c,
ad, sizeof ad,
nonce, firstkey) == 0 ||
memcmp(m, m2, sizeof m) == 0) {
printf("message can be forged\n");
}
c[i] ^= (i + 1U);
}
return 0;
}