From 13b8166c8989b5e83b0c998279c60c17bf46e890 Mon Sep 17 00:00:00 2001 From: Paul Selkirk Date: Thu, 5 Feb 2015 15:31:33 -0500 Subject: add all SHA cores (hello coretest_hashes) --- sw/test-sha256/hash_tester.c | 299 ++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 292 insertions(+), 7 deletions(-) (limited to 'sw') diff --git a/sw/test-sha256/hash_tester.c b/sw/test-sha256/hash_tester.c index 544e2c5..978cb82 100644 --- a/sw/test-sha256/hash_tester.c +++ b/sw/test-sha256/hash_tester.c @@ -13,7 +13,7 @@ * * * Authors: Joachim Strömbergson, Paul Selkirk - * Copyright (c) 2014, NORDUnet A/S All rights reserved. + * Copyright (c) 2014-2015, NORDUnet A/S All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are @@ -76,8 +76,18 @@ int repeat = 0; #define ADDR_DIGEST 0x80 /* addresses and codes for the specific hash cores */ -#define SHA256_PREFIX 0x0000 -#define SHA256_ADDR_BASE EIM_BASE_ADDR + SHA256_PREFIX +#define SHA1_ADDR_BASE EIM_BASE_ADDR + 0x1000 +#define SHA1_ADDR_NAME0 SHA1_ADDR_BASE + ADDR_NAME0 +#define SHA1_ADDR_NAME1 SHA1_ADDR_BASE + ADDR_NAME1 +#define SHA1_ADDR_VERSION SHA1_ADDR_BASE + ADDR_VERSION +#define SHA1_ADDR_CTRL SHA1_ADDR_BASE + ADDR_CTRL +#define SHA1_ADDR_STATUS SHA1_ADDR_BASE + ADDR_STATUS +#define SHA1_ADDR_BLOCK SHA1_ADDR_BASE + ADDR_BLOCK +#define SHA1_ADDR_DIGEST SHA1_ADDR_BASE + ADDR_DIGEST +#define SHA1_BLOCK_LEN 512 / 8 +#define SHA1_DIGEST_LEN 160 / 8 + +#define SHA256_ADDR_BASE EIM_BASE_ADDR + 0x2000 #define SHA256_ADDR_NAME0 SHA256_ADDR_BASE + ADDR_NAME0 #define SHA256_ADDR_NAME1 SHA256_ADDR_BASE + ADDR_NAME1 #define SHA256_ADDR_VERSION SHA256_ADDR_BASE + ADDR_VERSION @@ -88,6 +98,24 @@ int repeat = 0; #define SHA256_BLOCK_LEN 512 / 8 #define SHA256_DIGEST_LEN 256 / 8 +#define SHA512_ADDR_BASE EIM_BASE_ADDR + 0x3000 +#define SHA512_ADDR_NAME0 SHA512_ADDR_BASE + ADDR_NAME0 +#define SHA512_ADDR_NAME1 SHA512_ADDR_BASE + ADDR_NAME1 +#define SHA512_ADDR_VERSION SHA512_ADDR_BASE + ADDR_VERSION +#define SHA512_ADDR_CTRL SHA512_ADDR_BASE + ADDR_CTRL +#define SHA512_ADDR_STATUS SHA512_ADDR_BASE + ADDR_STATUS +#define SHA512_ADDR_BLOCK SHA512_ADDR_BASE + ADDR_BLOCK +#define SHA512_ADDR_DIGEST SHA512_ADDR_BASE + 0x100 +#define SHA512_BLOCK_LEN 1024 / 8 +#define SHA512_224_DIGEST_LEN 224 / 8 +#define SHA512_256_DIGEST_LEN 256 / 8 +#define SHA384_DIGEST_LEN 384 / 8 +#define SHA512_DIGEST_LEN 512 / 8 +#define MODE_SHA_512_224 0 << 2 +#define MODE_SHA_512_256 1 << 2 +#define MODE_SHA_384 2 << 2 +#define MODE_SHA_512 3 << 2 + /* SHA-1/SHA-256 One Block Message Sample Input Message: "abc" */ const uint8_t NIST_512_SINGLE[] = @@ -100,6 +128,11 @@ const uint8_t NIST_512_SINGLE[] = 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x18 }; +const uint8_t SHA1_SINGLE_DIGEST[] = +{ 0xa9, 0x99, 0x3e, 0x36, 0x47, 0x06, 0x81, 0x6a, + 0xba, 0x3e, 0x25, 0x71, 0x78, 0x50, 0xc2, 0x6c, + 0x9c, 0xd0, 0xd8, 0x9d }; + const uint8_t SHA256_SINGLE_DIGEST[] = { 0xBA, 0x78, 0x16, 0xBF, 0x8F, 0x01, 0xCF, 0xEA, 0x41, 0x41, 0x40, 0xDE, 0x5D, 0xAE, 0x22, 0x23, @@ -127,12 +160,129 @@ const uint8_t NIST_512_DOUBLE1[] = 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0xC0 }; +const uint8_t SHA1_DOUBLE_DIGEST[] = +{ 0x84, 0x98, 0x3E, 0x44, 0x1C, 0x3B, 0xD2, 0x6E, + 0xBA, 0xAE, 0x4A, 0xA1, 0xF9, 0x51, 0x29, 0xE5, + 0xE5, 0x46, 0x70, 0xF1 }; + const uint8_t SHA256_DOUBLE_DIGEST[] = { 0x24, 0x8D, 0x6A, 0x61, 0xD2, 0x06, 0x38, 0xB8, 0xE5, 0xC0, 0x26, 0x93, 0x0C, 0x3E, 0x60, 0x39, 0xA3, 0x3C, 0xE4, 0x59, 0x64, 0xFF, 0x21, 0x67, 0xF6, 0xEC, 0xED, 0xD4, 0x19, 0xDB, 0x06, 0xC1 }; +/* SHA-512 One Block Message Sample + Input Message: "abc" */ +const uint8_t NIST_1024_SINGLE[] = +{ 0x61, 0x62, 0x63, 0x80, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x18 }; + +const uint8_t SHA512_224_SINGLE_DIGEST[] = +{ 0x46, 0x34, 0x27, 0x0f, 0x70, 0x7b, 0x6a, 0x54, + 0xda, 0xae, 0x75, 0x30, 0x46, 0x08, 0x42, 0xe2, + 0x0e, 0x37, 0xed, 0x26, 0x5c, 0xee, 0xe9, 0xa4, + 0x3e, 0x89, 0x24, 0xaa }; +const uint8_t SHA512_256_SINGLE_DIGEST[] = +{ 0x53, 0x04, 0x8e, 0x26, 0x81, 0x94, 0x1e, 0xf9, + 0x9b, 0x2e, 0x29, 0xb7, 0x6b, 0x4c, 0x7d, 0xab, + 0xe4, 0xc2, 0xd0, 0xc6, 0x34, 0xfc, 0x6d, 0x46, + 0xe0, 0xe2, 0xf1, 0x31, 0x07, 0xe7, 0xaf, 0x23 }; +const uint8_t SHA384_SINGLE_DIGEST[] = +{ 0xcb, 0x00, 0x75, 0x3f, 0x45, 0xa3, 0x5e, 0x8b, + 0xb5, 0xa0, 0x3d, 0x69, 0x9a, 0xc6, 0x50, 0x07, + 0x27, 0x2c, 0x32, 0xab, 0x0e, 0xde, 0xd1, 0x63, + 0x1a, 0x8b, 0x60, 0x5a, 0x43, 0xff, 0x5b, 0xed, + 0x80, 0x86, 0x07, 0x2b, 0xa1, 0xe7, 0xcc, 0x23, + 0x58, 0xba, 0xec, 0xa1, 0x34, 0xc8, 0x25, 0xa7 }; +const uint8_t SHA512_SINGLE_DIGEST[] = +{ 0xdd, 0xaf, 0x35, 0xa1, 0x93, 0x61, 0x7a, 0xba, + 0xcc, 0x41, 0x73, 0x49, 0xae, 0x20, 0x41, 0x31, + 0x12, 0xe6, 0xfa, 0x4e, 0x89, 0xa9, 0x7e, 0xa2, + 0x0a, 0x9e, 0xee, 0xe6, 0x4b, 0x55, 0xd3, 0x9a, + 0x21, 0x92, 0x99, 0x2a, 0x27, 0x4f, 0xc1, 0xa8, + 0x36, 0xba, 0x3c, 0x23, 0xa3, 0xfe, 0xeb, 0xbd, + 0x45, 0x4d, 0x44, 0x23, 0x64, 0x3c, 0xe8, 0x0e, + 0x2a, 0x9a, 0xc9, 0x4f, 0xa5, 0x4c, 0xa4, 0x9f }; + +/* SHA-512 Two Block Message Sample + Input Message: "abcdefghbcdefghicdefghijdefghijkefghijklfghijklmghijklmn" + "hijklmnoijklmnopjklmnopqklmnopqrlmnopqrsmnopqrstnopqrstu" */ +const uint8_t NIST_1024_DOUBLE0[] = +{ 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, + 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, + 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, + 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x6b, + 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x6b, 0x6c, + 0x66, 0x67, 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, + 0x67, 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, + 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, + 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, 0x70, + 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, 0x70, 0x71, + 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, 0x70, 0x71, 0x72, + 0x6c, 0x6d, 0x6e, 0x6f, 0x70, 0x71, 0x72, 0x73, + 0x6d, 0x6e, 0x6f, 0x70, 0x71, 0x72, 0x73, 0x74, + 0x6e, 0x6f, 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, + 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }; +const uint8_t NIST_1024_DOUBLE1[] = +{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x03, 0x80 }; + +const uint8_t SHA512_224_DOUBLE_DIGEST[] = +{ 0x23, 0xfe, 0xc5, 0xbb, 0x94, 0xd6, 0x0b, 0x23, + 0x30, 0x81, 0x92, 0x64, 0x0b, 0x0c, 0x45, 0x33, + 0x35, 0xd6, 0x64, 0x73, 0x4f, 0xe4, 0x0e, 0x72, + 0x68, 0x67, 0x4a, 0xf9 }; +const uint8_t SHA512_256_DOUBLE_DIGEST[] = +{ 0x39, 0x28, 0xe1, 0x84, 0xfb, 0x86, 0x90, 0xf8, + 0x40, 0xda, 0x39, 0x88, 0x12, 0x1d, 0x31, 0xbe, + 0x65, 0xcb, 0x9d, 0x3e, 0xf8, 0x3e, 0xe6, 0x14, + 0x6f, 0xea, 0xc8, 0x61, 0xe1, 0x9b, 0x56, 0x3a }; +const uint8_t SHA384_DOUBLE_DIGEST[] = +{ 0x09, 0x33, 0x0c, 0x33, 0xf7, 0x11, 0x47, 0xe8, + 0x3d, 0x19, 0x2f, 0xc7, 0x82, 0xcd, 0x1b, 0x47, + 0x53, 0x11, 0x1b, 0x17, 0x3b, 0x3b, 0x05, 0xd2, + 0x2f, 0xa0, 0x80, 0x86, 0xe3, 0xb0, 0xf7, 0x12, + 0xfc, 0xc7, 0xc7, 0x1a, 0x55, 0x7e, 0x2d, 0xb9, + 0x66, 0xc3, 0xe9, 0xfa, 0x91, 0x74, 0x60, 0x39 }; +const uint8_t SHA512_DOUBLE_DIGEST[] = +{ 0x8e, 0x95, 0x9b, 0x75, 0xda, 0xe3, 0x13, 0xda, + 0x8c, 0xf4, 0xf7, 0x28, 0x14, 0xfc, 0x14, 0x3f, + 0x8f, 0x77, 0x79, 0xc6, 0xeb, 0x9f, 0x7f, 0xa1, + 0x72, 0x99, 0xae, 0xad, 0xb6, 0x88, 0x90, 0x18, + 0x50, 0x1d, 0x28, 0x9e, 0x49, 0x00, 0xf7, 0xe4, + 0x33, 0x1b, 0x99, 0xde, 0xc4, 0xb5, 0x43, 0x3a, + 0xc7, 0xd3, 0x29, 0xee, 0xb6, 0xdd, 0x26, 0x54, + 0x5e, 0x96, 0xe5, 0x5b, 0x87, 0x4b, 0xe9, 0x09 }; + /* ---------------- test-case low-level code ---------------- */ void dump(char *label, const uint8_t *buf, int len) @@ -257,19 +407,68 @@ int tc_wait_valid(off_t offset) /* TC1: Read name and version from SHA-1 core. */ int TC1(void) { - return 0; + uint8_t name0[4] = { 0x73, 0x68, 0x61, 0x31 }; /* "sha1" */ + uint8_t name1[4] = { 0x20, 0x20, 0x20, 0x20 }; /* " " */ + uint8_t version[4] = { 0x30, 0x2e, 0x35, 0x30 }; /* "0.50" */ + + if (!quiet) + printf("TC1: Reading name, type and version words from SHA-1 core.\n"); + + return + tc_expected(SHA1_ADDR_NAME0, name0, 4) || + tc_expected(SHA1_ADDR_NAME1, name1, 4) || + tc_expected(SHA1_ADDR_VERSION, version, 4); } /* TC2: SHA-1 Single block message test as specified by NIST. */ int TC2(void) { - return 0; + const uint8_t *block = NIST_512_SINGLE; + const uint8_t *expected = SHA1_SINGLE_DIGEST; + int ret; + + if (!quiet) + printf("TC2: Single block message test for SHA-1.\n"); + + /* Write block to SHA-1. */ + tc_write(SHA1_ADDR_BLOCK, block, SHA1_BLOCK_LEN); + /* Start initial block hashing, wait and check status. */ + tc_init(SHA1_ADDR_CTRL); + tc_wait_valid(SHA1_ADDR_STATUS); + /* Extract the digest. */ + ret = tc_expected(SHA1_ADDR_DIGEST, expected, SHA1_DIGEST_LEN); + return ret; } /* TC3: SHA-1 Double block message test as specified by NIST. */ int TC3(void) { - return 0; + const uint8_t *block[2] = { NIST_512_DOUBLE0, NIST_512_DOUBLE1 }; + static const uint8_t block0_expected[] = + { 0xF4, 0x28, 0x68, 0x18, 0xC3, 0x7B, 0x27, 0xAE, + 0x04, 0x08, 0xF5, 0x81, 0x84, 0x67, 0x71, 0x48, + 0x4A, 0x56, 0x65, 0x72 }; + const uint8_t *expected = SHA1_DOUBLE_DIGEST; + int ret; + + if (!quiet) + printf("TC3: Double block message test for SHA-1.\n"); + + /* Write first block to SHA-1. */ + tc_write(SHA1_ADDR_BLOCK, block[0], SHA1_BLOCK_LEN); + /* Start initial block hashing, wait and check status. */ + tc_init(SHA1_ADDR_CTRL); + tc_wait_valid(SHA1_ADDR_STATUS); + /* Extract the first digest. */ + tc_expected(SHA1_ADDR_DIGEST, block0_expected, SHA1_DIGEST_LEN); + /* Write second block to SHA-1. */ + tc_write(SHA1_ADDR_BLOCK, block[1], SHA1_BLOCK_LEN); + /* Start next block hashing, wait and check status. */ + tc_next(SHA1_ADDR_CTRL); + tc_wait_valid(SHA1_ADDR_STATUS); + /* Extract the second digest. */ + ret = tc_expected(SHA1_ADDR_DIGEST, expected, SHA1_DIGEST_LEN); + return ret; } /* ---------------- SHA-256 test cases ---------------- */ @@ -394,20 +593,106 @@ int TC7() /* TC8: Read name and version from SHA-512 core. */ int TC8() { - return 0; + uint8_t name0[4] = { 0x73, 0x68, 0x61, 0x32 }; /* "sha2" */ + uint8_t name1[4] = { 0x2d, 0x35, 0x31, 0x32 }; /* "-512" */ + uint8_t version[4] = { 0x30, 0x2e, 0x38, 0x30 }; /* "0.80" */ + + if (!quiet) + printf("TC8: Reading name, type and version words from SHA-512 core.\n"); + + return + tc_expected(SHA512_ADDR_NAME0, name0, 4) || + tc_expected(SHA512_ADDR_NAME1, name1, 4) || + tc_expected(SHA512_ADDR_VERSION, version, 4); } /* TC9: SHA-512 Single block message test as specified by NIST. We do this for all modes. */ +int tc9(int mode, const uint8_t *expected, int digest_len) +{ + const uint8_t *block = NIST_1024_SINGLE; + uint8_t init[4] = { 0, 0, 0, CTRL_INIT_CMD + mode }; + + return + /* Write block to SHA-512. */ + tc_write(SHA512_ADDR_BLOCK, block, SHA512_BLOCK_LEN) || + /* Start initial block hashing, wait and check status. */ + tc_write(SHA512_ADDR_CTRL, init, 4) || + tc_wait_valid(SHA512_ADDR_STATUS) || + /* Extract the digest. */ + tc_expected(SHA512_ADDR_DIGEST, expected, digest_len); +} + int TC9() { + if (!quiet) + printf("TC9-1: Single block message test for SHA-512/224.\n"); + if (tc9(MODE_SHA_512_224, SHA512_224_SINGLE_DIGEST, SHA512_224_DIGEST_LEN) != 0) + return 1; + + if (!quiet) + printf("TC9-2: Single block message test for SHA-512/256.\n"); + if (tc9(MODE_SHA_512_256, SHA512_256_SINGLE_DIGEST, SHA512_256_DIGEST_LEN) != 0) + return 1; + + if (!quiet) + printf("TC9-3: Single block message test for SHA-384.\n"); + if (tc9(MODE_SHA_384, SHA384_SINGLE_DIGEST, SHA384_DIGEST_LEN) != 0) + return 1; + + if (!quiet) + printf("TC9-4: Single block message test for SHA-512.\n"); + if (tc9(MODE_SHA_512, SHA512_SINGLE_DIGEST, SHA512_DIGEST_LEN) != 0) + return 1; + return 0; } /* TC10: SHA-512 Double block message test as specified by NIST. We do this for all modes. */ +int tc10(int mode, const uint8_t *expected, int digest_len) +{ + const uint8_t *block[2] = { NIST_1024_DOUBLE0, NIST_1024_DOUBLE1 }; + uint8_t init[4] = { 0, 0, 0, CTRL_INIT_CMD + mode }; + uint8_t next[4] = { 0, 0, 0, CTRL_NEXT_CMD + mode }; + + return + /* Write first block to SHA-512. */ + tc_write(SHA512_ADDR_BLOCK, block[0], SHA512_BLOCK_LEN) || + /* Start initial block hashing, wait and check status. */ + tc_write(SHA512_ADDR_CTRL, init, 4) || + tc_wait_ready(SHA512_ADDR_STATUS) || + /* Write second block to SHA-512. */ + tc_write(SHA512_ADDR_BLOCK, block[1], SHA512_BLOCK_LEN) || + /* Start next block hashing, wait and check status. */ + tc_write(SHA512_ADDR_CTRL, next, 4) || + tc_wait_valid(SHA512_ADDR_STATUS) || + /* Extract the digest. */ + tc_expected(SHA512_ADDR_DIGEST, expected, digest_len); +} + int TC10() { + if (!quiet) + printf("TC10-1: Double block message test for SHA-512/224.\n"); + if (tc10(MODE_SHA_512_224, SHA512_224_DOUBLE_DIGEST, SHA512_224_DIGEST_LEN) != 0) + return 1; + + if (!quiet) + printf("TC10-2: Double block message test for SHA-512/256.\n"); + if (tc10(MODE_SHA_512_256, SHA512_256_DOUBLE_DIGEST, SHA512_256_DIGEST_LEN) != 0) + return 1; + + if (!quiet) + printf("TC10-3: Double block message test for SHA-384.\n"); + if (tc10(MODE_SHA_384, SHA384_DOUBLE_DIGEST, SHA384_DIGEST_LEN) != 0) + return 1; + + if (!quiet) + printf("TC10-4: Double block message test for SHA-512.\n"); + if (tc10(MODE_SHA_512, SHA512_DOUBLE_DIGEST, SHA512_DIGEST_LEN) != 0) + return 1; + return 0; } -- cgit v1.2.3