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| author | LABBE Corentin <clabbe.montjoie@gmail.com> | 2015-12-17 13:45:39 +0100 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2015-12-22 20:43:35 +0800 |
| commit | 0c4c78de0417ced1da92351a3013e631860ea576 (patch) | |
| tree | 1901728828a5891d3a8e1f5db23226682a9bb41d | |
| parent | 51d77dddfff4a554744bfa0e67cf571319635645 (diff) | |
| download | lwn-0c4c78de0417ced1da92351a3013e631860ea576.tar.gz lwn-0c4c78de0417ced1da92351a3013e631860ea576.zip | |
crypto: hash - add zero length message hash for shax and md5
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 <clabbe.montjoie@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
| -rw-r--r-- | crypto/md5.c | 6 | ||||
| -rw-r--r-- | crypto/sha1_generic.c | 7 | ||||
| -rw-r--r-- | crypto/sha256_generic.c | 16 | ||||
| -rw-r--r-- | include/crypto/md5.h | 2 | ||||
| -rw-r--r-- | include/crypto/sha.h | 6 |
5 files changed, 37 insertions, 0 deletions
diff --git a/crypto/md5.c b/crypto/md5.c index 33d17e9a8702..2355a7c25c45 100644 --- a/crypto/md5.c +++ b/crypto/md5.c @@ -24,6 +24,12 @@ #include <linux/cryptohash.h> #include <asm/byteorder.h> +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 39e3acc438d9..6877cbb9105f 100644 --- a/crypto/sha1_generic.c +++ b/crypto/sha1_generic.c @@ -26,6 +26,13 @@ #include <crypto/sha1_base.h> #include <asm/byteorder.h> +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 78431163ed3c..8f9c47e1a96e 100644 --- a/crypto/sha256_generic.c +++ b/crypto/sha256_generic.c @@ -27,6 +27,22 @@ #include <asm/byteorder.h> #include <asm/unaligned.h> +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 146af825eedb..327deac963c0 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 dd7905a3c22e..c94d3eb1cefd 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; |