From: LABBE Corentin Subject: [PATCH v2 1/4] crypto: hash: add zero length message hash for shax and md5 Date: Tue, 8 Dec 2015 09:10:50 +0100 Message-ID: <1449562253-13846-2-git-send-email-clabbe.montjoie@gmail.com> References: <1449562253-13846-1-git-send-email-clabbe.montjoie@gmail.com> Cc: LABBE Corentin , linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org To: davem@davemloft.net, herbert@gondor.apana.org.au Return-path: In-Reply-To: <1449562253-13846-1-git-send-email-clabbe.montjoie@gmail.com> Sender: linux-kernel-owner@vger.kernel.org List-Id: linux-crypto.vger.kernel.org Some crypto drivers cannot process empty data message and return a precalculated hash for md5/sha1/sha224/sha256. This patch add thoses precalculated hash in include/crypto. Signed-off-by: LABBE Corentin --- crypto/md5.c | 6 ++++++ crypto/sha1_generic.c | 7 +++++++ crypto/sha256_generic.c | 16 ++++++++++++++++ include/crypto/md5.h | 2 ++ include/crypto/sha.h | 6 ++++++ 5 files changed, 37 insertions(+) diff --git a/crypto/md5.c b/crypto/md5.c index 33d17e9..2355a7c 100644 --- a/crypto/md5.c +++ b/crypto/md5.c @@ -24,6 +24,12 @@ #include #include +const u8 md5_zero_message_hash[MD5_DIGEST_SIZE] = { + 0xd4, 0x1d, 0x8c, 0xd9, 0x8f, 0x00, 0xb2, 0x04, + 0xe9, 0x80, 0x09, 0x98, 0xec, 0xf8, 0x42, 0x7e, +}; +EXPORT_SYMBOL_GPL(md5_zero_message_hash); + /* XXX: this stuff can be optimized */ static inline void le32_to_cpu_array(u32 *buf, unsigned int words) { diff --git a/crypto/sha1_generic.c b/crypto/sha1_generic.c index 39e3acc..6877cbb 100644 --- a/crypto/sha1_generic.c +++ b/crypto/sha1_generic.c @@ -26,6 +26,13 @@ #include #include +const u8 sha1_zero_message_hash[SHA1_DIGEST_SIZE] = { + 0xda, 0x39, 0xa3, 0xee, 0x5e, 0x6b, 0x4b, 0x0d, + 0x32, 0x55, 0xbf, 0xef, 0x95, 0x60, 0x18, 0x90, + 0xaf, 0xd8, 0x07, 0x09 +}; +EXPORT_SYMBOL_GPL(sha1_zero_message_hash); + static void sha1_generic_block_fn(struct sha1_state *sst, u8 const *src, int blocks) { diff --git a/crypto/sha256_generic.c b/crypto/sha256_generic.c index 7843116..8f9c47e 100644 --- a/crypto/sha256_generic.c +++ b/crypto/sha256_generic.c @@ -27,6 +27,22 @@ #include #include +const u8 sha224_zero_message_hash[SHA224_DIGEST_SIZE] = { + 0xd1, 0x4a, 0x02, 0x8c, 0x2a, 0x3a, 0x2b, 0xc9, 0x47, + 0x61, 0x02, 0xbb, 0x28, 0x82, 0x34, 0xc4, 0x15, 0xa2, + 0xb0, 0x1f, 0x82, 0x8e, 0xa6, 0x2a, 0xc5, 0xb3, 0xe4, + 0x2f +}; +EXPORT_SYMBOL_GPL(sha224_zero_message_hash); + +const u8 sha256_zero_message_hash[SHA256_DIGEST_SIZE] = { + 0xe3, 0xb0, 0xc4, 0x42, 0x98, 0xfc, 0x1c, 0x14, + 0x9a, 0xfb, 0xf4, 0xc8, 0x99, 0x6f, 0xb9, 0x24, + 0x27, 0xae, 0x41, 0xe4, 0x64, 0x9b, 0x93, 0x4c, + 0xa4, 0x95, 0x99, 0x1b, 0x78, 0x52, 0xb8, 0x55 +}; +EXPORT_SYMBOL_GPL(sha256_zero_message_hash); + static inline u32 Ch(u32 x, u32 y, u32 z) { return z ^ (x & (y ^ z)); diff --git a/include/crypto/md5.h b/include/crypto/md5.h index 146af82..327deac 100644 --- a/include/crypto/md5.h +++ b/include/crypto/md5.h @@ -13,6 +13,8 @@ #define MD5_H2 0x98badcfeUL #define MD5_H3 0x10325476UL +extern const u8 md5_zero_message_hash[MD5_DIGEST_SIZE]; + struct md5_state { u32 hash[MD5_HASH_WORDS]; u32 block[MD5_BLOCK_WORDS]; diff --git a/include/crypto/sha.h b/include/crypto/sha.h index dd7905a..c94d3eb 100644 --- a/include/crypto/sha.h +++ b/include/crypto/sha.h @@ -64,6 +64,12 @@ #define SHA512_H6 0x1f83d9abfb41bd6bULL #define SHA512_H7 0x5be0cd19137e2179ULL +extern const u8 sha1_zero_message_hash[SHA1_DIGEST_SIZE]; + +extern const u8 sha224_zero_message_hash[SHA224_DIGEST_SIZE]; + +extern const u8 sha256_zero_message_hash[SHA256_DIGEST_SIZE]; + struct sha1_state { u32 state[SHA1_DIGEST_SIZE / 4]; u64 count; -- 2.4.10