+/*
+ BLAKE2 reference source code package - reference C implementations
+
+ Copyright 2012, Samuel Neves <sneves@dei.uc.pt>. You may use this under the
+ terms of the CC0, the OpenSSL Licence, or the Apache Public License 2.0, at
+ your option. The terms of these licenses can be found at:
+
+ - CC0 1.0 Universal : http://creativecommons.org/publicdomain/zero/1.0
+ - OpenSSL license : https://www.openssl.org/source/license.html
+ - Apache 2.0 : http://www.apache.org/licenses/LICENSE-2.0
+
+ More information about the BLAKE2 hash function can be found at
+ https://blake2.net.
+*/
+
+#include <stdint.h>
+#include <string.h>
+#include <stdio.h>
+
+#include "blake2.h"
+#include "blake2-impl.h"
+
+static const uint64_t blake2b_IV[8] =
+{
+ 0x6a09e667f3bcc908ULL, 0xbb67ae8584caa73bULL,
+ 0x3c6ef372fe94f82bULL, 0xa54ff53a5f1d36f1ULL,
+ 0x510e527fade682d1ULL, 0x9b05688c2b3e6c1fULL,
+ 0x1f83d9abfb41bd6bULL, 0x5be0cd19137e2179ULL
+};
+
+static const uint8_t blake2b_sigma[12][16] =
+{
+ { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 } ,
+ { 14, 10, 4, 8, 9, 15, 13, 6, 1, 12, 0, 2, 11, 7, 5, 3 } ,
+ { 11, 8, 12, 0, 5, 2, 15, 13, 10, 14, 3, 6, 7, 1, 9, 4 } ,
+ { 7, 9, 3, 1, 13, 12, 11, 14, 2, 6, 5, 10, 4, 0, 15, 8 } ,
+ { 9, 0, 5, 7, 2, 4, 10, 15, 14, 1, 11, 12, 6, 8, 3, 13 } ,
+ { 2, 12, 6, 10, 0, 11, 8, 3, 4, 13, 7, 5, 15, 14, 1, 9 } ,
+ { 12, 5, 1, 15, 14, 13, 4, 10, 0, 7, 6, 3, 9, 2, 8, 11 } ,
+ { 13, 11, 7, 14, 12, 1, 3, 9, 5, 0, 15, 4, 8, 6, 2, 10 } ,
+ { 6, 15, 14, 9, 11, 3, 0, 8, 12, 2, 13, 7, 1, 4, 10, 5 } ,
+ { 10, 2, 8, 4, 7, 6, 1, 5, 15, 11, 9, 14, 3, 12, 13 , 0 } ,
+ { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 } ,
+ { 14, 10, 4, 8, 9, 15, 13, 6, 1, 12, 0, 2, 11, 7, 5, 3 }
+};
+
+
+static void blake2b_set_lastnode( blake2b_state *S )
+{
+ S->f[1] = (uint64_t)-1;
+}
+
+/* Some helper functions, not necessarily useful */
+static int blake2b_is_lastblock( const blake2b_state *S )
+{
+ return S->f[0] != 0;
+}
+
+static void blake2b_set_lastblock( blake2b_state *S )
+{
+ if( S->last_node ) blake2b_set_lastnode( S );
+
+ S->f[0] = (uint64_t)-1;
+}
+
+static void blake2b_increment_counter( blake2b_state *S, const uint64_t inc )
+{
+ S->t[0] += inc;
+ S->t[1] += ( S->t[0] < inc );
+}
+
+static void blake2b_init0( blake2b_state *S )
+{
+ size_t i;
+ memset( S, 0, sizeof( blake2b_state ) );
+
+ for( i = 0; i < 8; ++i ) S->h[i] = blake2b_IV[i];
+}
+
+/* init xors IV with input parameter block */
+int blake2b_init_param( blake2b_state *S, const blake2b_param *P )
+{
+ const uint8_t *p = ( const uint8_t * )( P );
+ size_t i;
+
+ blake2b_init0( S );
+
+ /* IV XOR ParamBlock */
+ for( i = 0; i < 8; ++i )
+ S->h[i] ^= load64( p + sizeof( S->h[i] ) * i );
+
+ S->outlen = P->digest_length;
+ return 0;
+}
+
+
+
+int blake2b_init( blake2b_state *S, size_t outlen )
+{
+ blake2b_param P[1];
+
+ if ( ( !outlen ) || ( outlen > BLAKE2B_OUTBYTES ) ) return -1;
+
+ P->digest_length = (uint8_t)outlen;
+ P->key_length = 0;
+ P->fanout = 1;
+ P->depth = 1;
+ store32( &P->leaf_length, 0 );
+ store32( &P->node_offset, 0 );
+ store32( &P->xof_length, 0 );
+ P->node_depth = 0;
+ P->inner_length = 0;
+ memset( P->reserved, 0, sizeof( P->reserved ) );
+ memset( P->salt, 0, sizeof( P->salt ) );
+ memset( P->personal, 0, sizeof( P->personal ) );
+ return blake2b_init_param( S, P );
+}
+
+
+int blake2b_init_key( blake2b_state *S, size_t outlen, const void *key, size_t keylen )
+{
+ blake2b_param P[1];
+
+ if ( ( !outlen ) || ( outlen > BLAKE2B_OUTBYTES ) ) return -1;
+
+ if ( !key || !keylen || keylen > BLAKE2B_KEYBYTES ) return -1;
+
+ P->digest_length = (uint8_t)outlen;
+ P->key_length = (uint8_t)keylen;
+ P->fanout = 1;
+ P->depth = 1;
+ store32( &P->leaf_length, 0 );
+ store32( &P->node_offset, 0 );
+ store32( &P->xof_length, 0 );
+ P->node_depth = 0;
+ P->inner_length = 0;
+ memset( P->reserved, 0, sizeof( P->reserved ) );
+ memset( P->salt, 0, sizeof( P->salt ) );
+ memset( P->personal, 0, sizeof( P->personal ) );
+
+ if( blake2b_init_param( S, P ) < 0 ) return -1;
+
+ {
+ uint8_t block[BLAKE2B_BLOCKBYTES];
+ memset( block, 0, BLAKE2B_BLOCKBYTES );
+ memcpy( block, key, keylen );
+ blake2b_update( S, block, BLAKE2B_BLOCKBYTES );
+ secure_zero_memory( block, BLAKE2B_BLOCKBYTES ); /* Burn the key from stack */
+ }
+ return 0;
+}
+
+#define G(r,i,a,b,c,d) \
+ do { \
+ a = a + b + m[blake2b_sigma[r][2*i+0]]; \
+ d = rotr64(d ^ a, 32); \
+ c = c + d; \
+ b = rotr64(b ^ c, 24); \
+ a = a + b + m[blake2b_sigma[r][2*i+1]]; \
+ d = rotr64(d ^ a, 16); \
+ c = c + d; \
+ b = rotr64(b ^ c, 63); \
+ } while(0)
+
+#define ROUND(r) \
+ do { \
+ G(r,0,v[ 0],v[ 4],v[ 8],v[12]); \
+ G(r,1,v[ 1],v[ 5],v[ 9],v[13]); \
+ G(r,2,v[ 2],v[ 6],v[10],v[14]); \
+ G(r,3,v[ 3],v[ 7],v[11],v[15]); \
+ G(r,4,v[ 0],v[ 5],v[10],v[15]); \
+ G(r,5,v[ 1],v[ 6],v[11],v[12]); \
+ G(r,6,v[ 2],v[ 7],v[ 8],v[13]); \
+ G(r,7,v[ 3],v[ 4],v[ 9],v[14]); \
+ } while(0)
+
+static void blake2b_compress( blake2b_state *S, const uint8_t block[BLAKE2B_BLOCKBYTES] )
+{
+ uint64_t m[16];
+ uint64_t v[16];
+ size_t i;
+
+ for( i = 0; i < 16; ++i ) {
+ m[i] = load64( block + i * sizeof( m[i] ) );
+ }
+
+ for( i = 0; i < 8; ++i ) {
+ v[i] = S->h[i];
+ }
+
+ v[ 8] = blake2b_IV[0];
+ v[ 9] = blake2b_IV[1];
+ v[10] = blake2b_IV[2];
+ v[11] = blake2b_IV[3];
+ v[12] = blake2b_IV[4] ^ S->t[0];
+ v[13] = blake2b_IV[5] ^ S->t[1];
+ v[14] = blake2b_IV[6] ^ S->f[0];
+ v[15] = blake2b_IV[7] ^ S->f[1];
+
+ ROUND( 0 );
+ ROUND( 1 );
+ ROUND( 2 );
+ ROUND( 3 );
+ ROUND( 4 );
+ ROUND( 5 );
+ ROUND( 6 );
+ ROUND( 7 );
+ ROUND( 8 );
+ ROUND( 9 );
+ ROUND( 10 );
+ ROUND( 11 );
+
+ for( i = 0; i < 8; ++i ) {
+ S->h[i] = S->h[i] ^ v[i] ^ v[i + 8];
+ }
+}
+
+#undef G
+#undef ROUND
+
+int blake2b_update( blake2b_state *S, const void *pin, size_t inlen )
+{
+ const unsigned char * in = (const unsigned char *)pin;
+ if( inlen > 0 )
+ {
+ size_t left = S->buflen;
+ size_t fill = BLAKE2B_BLOCKBYTES - left;
+ if( inlen > fill )
+ {
+ S->buflen = 0;
+ memcpy( S->buf + left, in, fill ); /* Fill buffer */
+ blake2b_increment_counter( S, BLAKE2B_BLOCKBYTES );
+ blake2b_compress( S, S->buf ); /* Compress */
+ in += fill; inlen -= fill;
+ while(inlen > BLAKE2B_BLOCKBYTES) {
+ blake2b_increment_counter(S, BLAKE2B_BLOCKBYTES);
+ blake2b_compress( S, in );
+ in += BLAKE2B_BLOCKBYTES;
+ inlen -= BLAKE2B_BLOCKBYTES;
+ }
+ }
+ memcpy( S->buf + S->buflen, in, inlen );
+ S->buflen += inlen;
+ }
+ return 0;
+}
+
+int blake2b_final( blake2b_state *S, void *out, size_t outlen )
+{
+ uint8_t buffer[BLAKE2B_OUTBYTES] = {0};
+ size_t i;
+
+ if( out == NULL || outlen < S->outlen )
+ return -1;
+
+ if( blake2b_is_lastblock( S ) )
+ return -1;
+
+ blake2b_increment_counter( S, S->buflen );
+ blake2b_set_lastblock( S );
+ memset( S->buf + S->buflen, 0, BLAKE2B_BLOCKBYTES - S->buflen ); /* Padding */
+ blake2b_compress( S, S->buf );
+
+ for( i = 0; i < 8; ++i ) /* Output full hash to temp buffer */
+ store64( buffer + sizeof( S->h[i] ) * i, S->h[i] );
+
+ memcpy( out, buffer, S->outlen );
+ secure_zero_memory(buffer, sizeof(buffer));
+ return 0;
+}
+
+/* inlen, at least, should be uint64_t. Others can be size_t. */
+int blake2b( void *out, size_t outlen, const void *in, size_t inlen, const void *key, size_t keylen )
+{
+ blake2b_state S[1];
+
+ /* Verify parameters */
+ if ( NULL == in && inlen > 0 ) return -1;
+
+ if ( NULL == out ) return -1;
+
+ if( NULL == key && keylen > 0 ) return -1;
+
+ if( !outlen || outlen > BLAKE2B_OUTBYTES ) return -1;
+
+ if( keylen > BLAKE2B_KEYBYTES ) return -1;
+
+ if( keylen > 0 )
+ {
+ if( blake2b_init_key( S, outlen, key, keylen ) < 0 ) return -1;
+ }
+ else
+ {
+ if( blake2b_init( S, outlen ) < 0 ) return -1;
+ }
+
+ blake2b_update( S, ( const uint8_t * )in, inlen );
+ blake2b_final( S, out, outlen );
+ return 0;
+}
+
+int blake2( void *out, size_t outlen, const void *in, size_t inlen, const void *key, size_t keylen ) {
+ return blake2b(out, outlen, in, inlen, key, keylen);
+}
+
+#if defined(SUPERCOP)
+int crypto_hash( unsigned char *out, unsigned char *in, unsigned long long inlen )
+{
+ return blake2b( out, BLAKE2B_OUTBYTES, in, inlen, NULL, 0 );
+}
+#endif
+
+#if defined(BLAKE2B_SELFTEST)
+#include <string.h>
+#include "blake2-kat.h"
+int main( void )
+{
+ uint8_t key[BLAKE2B_KEYBYTES];
+ uint8_t buf[BLAKE2_KAT_LENGTH];
+ size_t i, step;
+
+ for( i = 0; i < BLAKE2B_KEYBYTES; ++i )
+ key[i] = ( uint8_t )i;
+
+ for( i = 0; i < BLAKE2_KAT_LENGTH; ++i )
+ buf[i] = ( uint8_t )i;
+
+ /* Test simple API */
+ for( i = 0; i < BLAKE2_KAT_LENGTH; ++i )
+ {
+ uint8_t hash[BLAKE2B_OUTBYTES];
+ blake2b( hash, BLAKE2B_OUTBYTES, buf, i, key, BLAKE2B_KEYBYTES );
+
+ if( 0 != memcmp( hash, blake2b_keyed_kat[i], BLAKE2B_OUTBYTES ) )
+ {
+ goto fail;
+ }
+ }
+
+ /* Test streaming API */
+ for(step = 1; step < BLAKE2B_BLOCKBYTES; ++step) {
+ for (i = 0; i < BLAKE2_KAT_LENGTH; ++i) {
+ uint8_t hash[BLAKE2B_OUTBYTES];
+ blake2b_state S;
+ uint8_t * p = buf;
+ size_t mlen = i;
+ int err = 0;
+
+ if( (err = blake2b_init_key(&S, BLAKE2B_OUTBYTES, key, BLAKE2B_KEYBYTES)) < 0 ) {
+ goto fail;
+ }
+
+ while (mlen >= step) {
+ if ( (err = blake2b_update(&S, p, step)) < 0 ) {
+ goto fail;
+ }
+ mlen -= step;
+ p += step;
+ }
+ if ( (err = blake2b_update(&S, p, mlen)) < 0) {
+ goto fail;
+ }
+ if ( (err = blake2b_final(&S, hash, BLAKE2B_OUTBYTES)) < 0) {
+ goto fail;
+ }
+
+ if (0 != memcmp(hash, blake2b_keyed_kat[i], BLAKE2B_OUTBYTES)) {
+ goto fail;
+ }
+ }
+ }
+
+ puts( "ok" );
+ return 0;
+fail:
+ puts("error");
+ return -1;
+}
+#endif
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