Resubmitting this patch which extends sha256_generic.c to support SHA-224 as
described in FIPS 180-2 and RFC 3874. HMAC-SHA-224 as described in RFC4231
is then supported through the hmac interface.
Patch includes test vectors for SHA-224 and HMAC-SHA-224.
SHA-224 chould be chosen as a hash algorithm when 112 bits of security
strength is required.
Patch generated against the 2.6.24-rc1 kernel and tested against
2.6.24-rc1-git14 which includes fix for scatter gather implementation for HMAC.
Please Apply.
Signed-off-by: Jonathan Lynch <[email protected]>
---
diff -uprN -X linux-2.6.24-rc1-vanilla/Documentation/dontdiff linux-2.6.24-rc1-vanilla/crypto/Kconfig linux-2.6.24-rc1/crypto/Kconfig
--- linux-2.6.24-rc1-vanilla/crypto/Kconfig 2007-11-05 17:12:50.291842000 +0000
+++ linux-2.6.24-rc1/crypto/Kconfig 2007-11-05 18:18:31.571720000 +0000
@@ -91,7 +91,7 @@ config CRYPTO_SHA1
SHA-1 secure hash standard (FIPS 180-1/DFIPS 180-2).
config CRYPTO_SHA256
- tristate "SHA256 digest algorithm"
+ tristate "SHA224 and SHA256 digest algorithm"
select CRYPTO_ALGAPI
help
SHA256 secure hash standard (DFIPS 180-2).
@@ -99,6 +99,9 @@ config CRYPTO_SHA256
This version of SHA implements a 256 bit hash with 128 bits of
security against collision attacks.
+ This code also includes SHA-224, a 224 bit hash with 112 bits
+ of security against collision attacks.
+
config CRYPTO_SHA512
tristate "SHA384 and SHA512 digest algorithms"
select CRYPTO_ALGAPI
diff -uprN -X linux-2.6.24-rc1-vanilla/Documentation/dontdiff linux-2.6.24-rc1-vanilla/crypto/sha256_generic.c linux-2.6.24-rc1/crypto/sha256_generic.c
--- linux-2.6.24-rc1-vanilla/crypto/sha256_generic.c 2007-11-05 17:12:50.454842000 +0000
+++ linux-2.6.24-rc1/crypto/sha256_generic.c 2007-11-06 14:24:52.872908000 +0000
@@ -9,6 +9,7 @@
* Copyright (c) Jean-Luc Cooke <[email protected]>
* Copyright (c) Andrew McDonald <[email protected]>
* Copyright (c) 2002 James Morris <[email protected]>
+ * SHA224 Support Copyright 2007 Intel Corporation <[email protected]>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
@@ -219,6 +220,22 @@ static void sha256_transform(u32 *state,
memset(W, 0, 64 * sizeof(u32));
}
+
+static void sha224_init(struct crypto_tfm *tfm)
+{
+ struct sha256_ctx *sctx = crypto_tfm_ctx(tfm);
+ sctx->state[0] = SHA224_H0;
+ sctx->state[1] = SHA224_H1;
+ sctx->state[2] = SHA224_H2;
+ sctx->state[3] = SHA224_H3;
+ sctx->state[4] = SHA224_H4;
+ sctx->state[5] = SHA224_H5;
+ sctx->state[6] = SHA224_H6;
+ sctx->state[7] = SHA224_H7;
+ sctx->count[0] = 0;
+ sctx->count[1] = 0;
+}
+
static void sha256_init(struct crypto_tfm *tfm)
{
struct sha256_ctx *sctx = crypto_tfm_ctx(tfm);
@@ -295,8 +312,17 @@ static void sha256_final(struct crypto_t
memset(sctx, 0, sizeof(*sctx));
}
+static void sha224_final(struct crypto_tfm *tfm, u8 *hash)
+{
+ u8 D[SHA256_DIGEST_SIZE];
+
+ sha256_final(tfm, D);
+
+ memcpy(hash, D, SHA224_DIGEST_SIZE);
+ memset(D, 0, SHA256_DIGEST_SIZE);
+}
-static struct crypto_alg alg = {
+static struct crypto_alg sha256 = {
.cra_name = "sha256",
.cra_driver_name= "sha256-generic",
.cra_flags = CRYPTO_ALG_TYPE_DIGEST,
@@ -304,28 +330,58 @@ static struct crypto_alg alg = {
.cra_ctxsize = sizeof(struct sha256_ctx),
.cra_module = THIS_MODULE,
.cra_alignmask = 3,
- .cra_list = LIST_HEAD_INIT(alg.cra_list),
+ .cra_list = LIST_HEAD_INIT(sha256.cra_list),
.cra_u = { .digest = {
.dia_digestsize = SHA256_DIGEST_SIZE,
- .dia_init = sha256_init,
- .dia_update = sha256_update,
- .dia_final = sha256_final } }
+ .dia_init = sha256_init,
+ .dia_update = sha256_update,
+ .dia_final = sha256_final } }
+};
+
+static struct crypto_alg sha224 = {
+ .cra_name = "sha224",
+ .cra_driver_name = "sha224-generic",
+ .cra_flags = CRYPTO_ALG_TYPE_DIGEST,
+ .cra_blocksize = SHA224_BLOCK_SIZE,
+ .cra_ctxsize = sizeof(struct sha256_ctx),
+ .cra_module = THIS_MODULE,
+ .cra_alignmask = 3,
+ .cra_list = LIST_HEAD_INIT(sha224.cra_list),
+ .cra_u = { .digest = {
+ .dia_digestsize = SHA224_DIGEST_SIZE,
+ .dia_init = sha224_init,
+ .dia_update = sha256_update,
+ .dia_final = sha224_final } }
};
static int __init init(void)
{
- return crypto_register_alg(&alg);
+ int ret = 0;
+
+ ret = crypto_register_alg(&sha224);
+
+ if (ret < 0)
+ return ret;
+
+ ret = crypto_register_alg(&sha256);
+
+ if (ret < 0)
+ crypto_unregister_alg(&sha224);
+
+ return ret;
}
static void __exit fini(void)
{
- crypto_unregister_alg(&alg);
+ crypto_unregister_alg(&sha224);
+ crypto_unregister_alg(&sha256);
}
module_init(init);
module_exit(fini);
MODULE_LICENSE("GPL");
-MODULE_DESCRIPTION("SHA256 Secure Hash Algorithm");
+MODULE_DESCRIPTION("SHA-224 and SHA-256 Secure Hash Algorithm");
+MODULE_ALIAS("sha224");
MODULE_ALIAS("sha256");
diff -uprN -X linux-2.6.24-rc1-vanilla/Documentation/dontdiff linux-2.6.24-rc1-vanilla/crypto/tcrypt.c linux-2.6.24-rc1/crypto/tcrypt.c
--- linux-2.6.24-rc1-vanilla/crypto/tcrypt.c 2007-11-05 17:12:50.468842000 +0000
+++ linux-2.6.24-rc1/crypto/tcrypt.c 2007-11-07 12:17:23.795465000 +0000
@@ -12,6 +12,7 @@
* Software Foundation; either version 2 of the License, or (at your option)
* any later version.
*
+ * 2007-11-06 Added SHA-224 and SHA-224-HMAC tests
* 2006-12-07 Added SHA384 HMAC and SHA512 HMAC tests
* 2004-08-09 Added cipher speed tests (Reyk Floeter <[email protected]>)
* 2003-09-14 Rewritten by Kartikey Mahendra Bhatt
@@ -74,8 +75,9 @@ static char *xbuf;
static char *tvmem;
static char *check[] = {
- "des", "md5", "des3_ede", "rot13", "sha1", "sha256", "blowfish",
- "twofish", "serpent", "sha384", "sha512", "md4", "aes", "cast6",
+ "des", "md5", "des3_ede", "rot13", "sha1", "sha224", "sha256",
+ "blowfish", "twofish", "serpent", "sha384", "sha512", "md4", "aes",
+ "cast6", "arc4", "michael_mic", "deflate", "crc32c", "tea", "xtea",
"arc4", "michael_mic", "deflate", "crc32c", "tea", "xtea",
"khazad", "wp512", "wp384", "wp256", "tnepres", "xeta", "fcrypt",
"camellia", "seed", NULL
@@ -908,6 +910,8 @@ static void do_test(void)
test_hash("md4", md4_tv_template, MD4_TEST_VECTORS);
+ test_hash("sha224", sha224_tv_template, SHA224_TEST_VECTORS);
+
test_hash("sha256", sha256_tv_template, SHA256_TEST_VECTORS);
//BLOWFISH
@@ -1053,6 +1057,8 @@ static void do_test(void)
HMAC_MD5_TEST_VECTORS);
test_hash("hmac(sha1)", hmac_sha1_tv_template,
HMAC_SHA1_TEST_VECTORS);
+ test_hash("hmac(sha224)", hmac_sha224_tv_template,
+ HMAC_SHA224_TEST_VECTORS);
test_hash("hmac(sha256)", hmac_sha256_tv_template,
HMAC_SHA256_TEST_VECTORS);
test_hash("hmac(sha384)", hmac_sha384_tv_template,
@@ -1281,6 +1287,9 @@ static void do_test(void)
camellia_cbc_dec_tv_template,
CAMELLIA_CBC_DEC_TEST_VECTORS);
break;
+ case 33:
+ test_hash("sha224", sha224_tv_template, SHA224_TEST_VECTORS);
+ break;
case 100:
test_hash("hmac(md5)", hmac_md5_tv_template,
@@ -1306,7 +1315,10 @@ static void do_test(void)
test_hash("hmac(sha512)", hmac_sha512_tv_template,
HMAC_SHA512_TEST_VECTORS);
break;
-
+ case 105:
+ test_hash("hmac(sha224)", hmac_sha224_tv_template,
+ HMAC_SHA224_TEST_VECTORS);
+ break;
case 200:
test_cipher_speed("ecb(aes)", ENCRYPT, sec, NULL, 0,
@@ -1441,6 +1453,10 @@ static void do_test(void)
test_hash_speed("tgr192", sec, generic_hash_speed_template);
if (mode > 300 && mode < 400) break;
+ case 313:
+ test_hash_speed("sha224", sec, generic_hash_speed_template);
+ if (mode > 300 && mode < 400) break;
+
case 399:
break;
diff -uprN -X linux-2.6.24-rc1-vanilla/Documentation/dontdiff linux-2.6.24-rc1-vanilla/crypto/tcrypt.h linux-2.6.24-rc1/crypto/tcrypt.h
--- linux-2.6.24-rc1-vanilla/crypto/tcrypt.h 2007-11-05 17:12:50.492842000 +0000
+++ linux-2.6.24-rc1/crypto/tcrypt.h 2007-11-07 10:01:12.722969000 +0000
@@ -173,6 +173,33 @@ static struct hash_testvec sha1_tv_templ
}
};
+
+/*
+ * SHA224 test vectors from from FIPS PUB 180-2
+ */
+#define SHA224_TEST_VECTORS 2
+
+static struct hash_testvec sha224_tv_template[] = {
+ {
+ .plaintext = "abc",
+ .psize = 3,
+ .digest = { 0x23, 0x09, 0x7D, 0x22, 0x34, 0x05, 0xD8, 0x22,
+ 0x86, 0x42, 0xA4, 0x77, 0xBD, 0xA2, 0x55, 0xB3,
+ 0x2A, 0xAD, 0xBC, 0xE4, 0xBD, 0xA0, 0xB3, 0xF7,
+ 0xE3, 0x6C, 0x9D, 0xA7},
+ }, {
+ .plaintext =
+ "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq",
+ .psize = 56,
+ .digest = { 0x75, 0x38, 0x8B, 0x16, 0x51, 0x27, 0x76, 0xCC,
+ 0x5D, 0xBA, 0x5D, 0xA1, 0xFD, 0x89, 0x01, 0x50,
+ 0xB0, 0xC6, 0x45, 0x5C, 0xB4, 0xF5, 0x8B, 0x19,
+ 0x52, 0x52, 0x25, 0x25 },
+ .np = 2,
+ .tap = { 28, 28 }
+ }
+};
+
/*
* SHA256 test vectors from from NIST
*/
@@ -817,6 +844,121 @@ static struct hash_testvec hmac_sha1_tv_
},
};
+
+/*
+ * SHA224 HMAC test vectors from RFC4231
+ */
+#define HMAC_SHA224_TEST_VECTORS 4
+
+static struct hash_testvec hmac_sha224_tv_template[] = {
+ {
+ .key = { 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b,
+ 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b, 0x0b,
+ 0x0b, 0x0b, 0x0b, 0x0b },
+ .ksize = 20,
+ /* ("Hi There") */
+ .plaintext = { 0x48, 0x69, 0x20, 0x54, 0x68, 0x65, 0x72, 0x65 },
+ .psize = 8,
+ .digest = { 0x89, 0x6f, 0xb1, 0x12, 0x8a, 0xbb, 0xdf, 0x19,
+ 0x68, 0x32, 0x10, 0x7c, 0xd4, 0x9d, 0xf3, 0x3f,
+ 0x47, 0xb4, 0xb1, 0x16, 0x99, 0x12, 0xba, 0x4f,
+ 0x53, 0x68, 0x4b, 0x22},
+ }, {
+ .key = { 0x4a, 0x65, 0x66, 0x65 }, /* ("Jefe") */
+ .ksize = 4,
+ /* ("what do ya want for nothing?") */
+ .plaintext = { 0x77, 0x68, 0x61, 0x74, 0x20, 0x64, 0x6f, 0x20,
+ 0x79, 0x61, 0x20, 0x77, 0x61, 0x6e, 0x74, 0x20,
+ 0x66, 0x6f, 0x72, 0x20, 0x6e, 0x6f, 0x74, 0x68,
+ 0x69, 0x6e, 0x67, 0x3f },
+ .psize = 28,
+ .digest = { 0xa3, 0x0e, 0x01, 0x09, 0x8b, 0xc6, 0xdb, 0xbf,
+ 0x45, 0x69, 0x0f, 0x3a, 0x7e, 0x9e, 0x6d, 0x0f,
+ 0x8b, 0xbe, 0xa2, 0xa3, 0x9e, 0x61, 0x48, 0x00,
+ 0x8f, 0xd0, 0x5e, 0x44 },
+ .np = 4,
+ .tap = { 7, 7, 7, 7 }
+ }, {
+ .key = { 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
+ 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
+ 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
+ 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
+ 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
+ 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
+ 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
+ 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
+ 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
+ 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
+ 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
+ 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
+ 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
+ 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
+ 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
+ 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
+ 0xaa, 0xaa, 0xaa },
+ .ksize = 131,
+ /* ("Test Using Larger Than Block-Size Key - Hash Key First") */
+ .plaintext = { 0x54, 0x65, 0x73, 0x74, 0x20, 0x55, 0x73, 0x69,
+ 0x6e, 0x67, 0x20, 0x4c, 0x61, 0x72, 0x67, 0x65,
+ 0x72, 0x20, 0x54, 0x68, 0x61, 0x6e, 0x20, 0x42,
+ 0x6c, 0x6f, 0x63, 0x6b, 0x2d, 0x53, 0x69, 0x7a,
+ 0x65, 0x20, 0x4b, 0x65, 0x79, 0x20, 0x2d, 0x20,
+ 0x48, 0x61, 0x73, 0x68, 0x20, 0x4b, 0x65, 0x79,
+ 0x20, 0x46, 0x69, 0x72, 0x73, 0x74 },
+ .psize = 54,
+ .digest = { 0x95, 0xe9, 0xa0, 0xdb, 0x96, 0x20, 0x95, 0xad,
+ 0xae, 0xbe, 0x9b, 0x2d, 0x6f, 0x0d, 0xbc, 0xe2,
+ 0xd4, 0x99, 0xf1, 0x12, 0xf2, 0xd2, 0xb7, 0x27,
+ 0x3f, 0xa6, 0x87, 0x0e },
+ }, {
+ .key = { 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
+ 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
+ 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
+ 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
+ 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
+ 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
+ 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
+ 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
+ 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
+ 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
+ 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
+ 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
+ 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
+ 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
+ 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
+ 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
+ 0xaa, 0xaa, 0xaa },
+ .ksize = 131,
+ /* ("This is a test using a larger than block-size key and a")
+ (" larger than block-size data. The key needs to be")
+ (" hashed before being used by the HMAC algorithm.") */
+ .plaintext = { 0x54, 0x68, 0x69, 0x73, 0x20, 0x69, 0x73, 0x20,
+ 0x61, 0x20, 0x74, 0x65, 0x73, 0x74, 0x20, 0x75,
+ 0x73, 0x69, 0x6e, 0x67, 0x20, 0x61, 0x20, 0x6c,
+ 0x61, 0x72, 0x67, 0x65, 0x72, 0x20, 0x74, 0x68,
+ 0x61, 0x6e, 0x20, 0x62, 0x6c, 0x6f, 0x63, 0x6b,
+ 0x2d, 0x73, 0x69, 0x7a, 0x65, 0x20, 0x6b, 0x65,
+ 0x79, 0x20, 0x61, 0x6e, 0x64, 0x20, 0x61, 0x20,
+ 0x6c, 0x61, 0x72, 0x67, 0x65, 0x72, 0x20, 0x74,
+ 0x68, 0x61, 0x6e, 0x20, 0x62, 0x6c, 0x6f, 0x63,
+ 0x6b, 0x2d, 0x73, 0x69, 0x7a, 0x65, 0x20, 0x64,
+ 0x61, 0x74, 0x61, 0x2e, 0x20, 0x54, 0x68, 0x65,
+ 0x20, 0x6b, 0x65, 0x79, 0x20, 0x6e, 0x65, 0x65,
+ 0x64, 0x73, 0x20, 0x74, 0x6f, 0x20, 0x62, 0x65,
+ 0x20, 0x68, 0x61, 0x73, 0x68, 0x65, 0x64, 0x20,
+ 0x62, 0x65, 0x66, 0x6f, 0x72, 0x65, 0x20, 0x62,
+ 0x65, 0x69, 0x6e, 0x67, 0x20, 0x75, 0x73, 0x65,
+ 0x64, 0x20, 0x62, 0x79, 0x20, 0x74, 0x68, 0x65,
+ 0x20, 0x48, 0x4d, 0x41, 0x43, 0x20, 0x61, 0x6c,
+ 0x67, 0x6f, 0x72, 0x69, 0x74, 0x68, 0x6d, 0x2e },
+ .psize = 152,
+ .digest = { 0x3a, 0x85, 0x41, 0x66, 0xac, 0x5d, 0x9f, 0x02,
+ 0x3f, 0x54, 0xd5, 0x17, 0xd0, 0xb3, 0x9d, 0xbd,
+ 0x94, 0x67, 0x70, 0xdb, 0x9c, 0x2b, 0x95, 0xc9,
+ 0xf6, 0xf5, 0x65, 0xd1 },
+ },
+};
+
/*
* HMAC-SHA256 test vectors from
* draft-ietf-ipsec-ciph-sha-256-01.txt
diff -uprN -X linux-2.6.24-rc1-vanilla/Documentation/dontdiff linux-2.6.24-rc1-vanilla/include/crypto/sha.h linux-2.6.24-rc1/include/crypto/sha.h
--- linux-2.6.24-rc1-vanilla/include/crypto/sha.h 2007-11-05 17:14:02.110724000 +0000
+++ linux-2.6.24-rc1/include/crypto/sha.h 2007-11-06 15:04:22.997509000 +0000
@@ -8,6 +8,9 @@
#define SHA1_DIGEST_SIZE 20
#define SHA1_BLOCK_SIZE 64
+#define SHA224_DIGEST_SIZE 28
+#define SHA224_BLOCK_SIZE 64
+
#define SHA256_DIGEST_SIZE 32
#define SHA256_BLOCK_SIZE 64
@@ -23,6 +26,15 @@
#define SHA1_H3 0x10325476UL
#define SHA1_H4 0xc3d2e1f0UL
+#define SHA224_H0 0xc1059ed8UL
+#define SHA224_H1 0x367cd507UL
+#define SHA224_H2 0x3070dd17UL
+#define SHA224_H3 0xf70e5939UL
+#define SHA224_H4 0xffc00b31UL
+#define SHA224_H5 0x68581511UL
+#define SHA224_H6 0x64f98fa7UL
+#define SHA224_H7 0xbefa4fa4UL
+
#define SHA256_H0 0x6a09e667UL
#define SHA256_H1 0xbb67ae85UL
#define SHA256_H2 0x3c6ef372UL
Signed-off-by: Jonathan Lynch <[email protected]>
On Wed, Nov 07, 2007 at 07:59:23PM +0000, Jonathan Lynch wrote:
> Resubmitting this patch which extends sha256_generic.c to support SHA-224 as
> described in FIPS 180-2 and RFC 3874. HMAC-SHA-224 as described in RFC4231
> is then supported through the hmac interface.
Patch applied. Thanks.
--
Visit Openswan at http://www.openswan.org/
Email: Herbert Xu ~{PmV>HI~} <[email protected]>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt