Commit d16b38f4 authored by Reuben Dowle's avatar Reuben Dowle Committed by Tom Rini
Browse files

Add support for SHA384 and SHA512

The current recommendation for best security practice from the US government
is to use SHA384 for TOP SECRET [1].

This patch adds support for SHA384 and SHA512 in the hash command, and also
allows FIT images to be hashed with these algorithms, and signed with
sha384,rsaXXXX and sha512,rsaXXXX

The SHA implementation is adapted from the linux kernel implementation.

[1] Commercial National Security Algorithm Suite
http://www.iad.gov/iad/programs/iad-initiatives/cnsa-suite.cfm

Signed-off-by: default avatarReuben Dowle <reuben.dowle@4rf.com>
parent f191f3a1
......@@ -358,12 +358,26 @@ config FIT_ENABLE_SHA256_SUPPORT
help
Enable this to support SHA256 checksum of FIT image contents. A
SHA256 checksum is a 256-bit (32-byte) hash value used to check that
the image contents have not been corrupted. SHA256 is recommended
for use in secure applications since (as at 2016) there is no known
feasible attack that could produce a 'collision' with differing
input data. Use this for the highest security. Note that only the
SHA256 variant is supported: SHA512 and others are not currently
supported in U-Boot.
the image contents have not been corrupted.
config FIT_ENABLE_SHA384_SUPPORT
bool "Support SHA384 checksum of FIT image contents"
default n
select SHA384
help
Enable this to support SHA384 checksum of FIT image contents. A
SHA384 checksum is a 384-bit (48-byte) hash value used to check that
the image contents have not been corrupted. Use this for the highest
security.
config FIT_ENABLE_SHA512_SUPPORT
bool "Support SHA512 checksum of FIT image contents"
default n
select SHA512
help
Enable this to support SHA512 checksum of FIT image contents. A
SHA512 checksum is a 512-bit (64-byte) hash value used to check that
the image contents have not been corrupted.
config FIT_SIGNATURE
bool "Enable signature verification of FIT uImages"
......
......@@ -31,6 +31,7 @@
#include <u-boot/crc.h>
#include <u-boot/sha1.h>
#include <u-boot/sha256.h>
#include <u-boot/sha512.h>
#include <u-boot/md5.h>
#if !defined(USE_HOSTCC) && defined(CONFIG_NEEDS_MANUAL_RELOC)
......@@ -95,6 +96,65 @@ static int hash_finish_sha256(struct hash_algo *algo, void *ctx, void
}
#endif
#if defined(CONFIG_SHA384)
static int hash_init_sha384(struct hash_algo *algo, void **ctxp)
{
sha512_context *ctx = malloc(sizeof(sha512_context));
sha384_starts(ctx);
*ctxp = ctx;
return 0;
}
static int hash_update_sha384(struct hash_algo *algo, void *ctx,
const void *buf, unsigned int size, int is_last)
{
sha384_update((sha512_context *)ctx, buf, size);
return 0;
}
static int hash_finish_sha384(struct hash_algo *algo, void *ctx, void
*dest_buf, int size)
{
if (size < algo->digest_size)
return -1;
sha384_finish((sha512_context *)ctx, dest_buf);
free(ctx);
return 0;
}
#endif
#if defined(CONFIG_SHA512)
static int hash_init_sha512(struct hash_algo *algo, void **ctxp)
{
sha512_context *ctx = malloc(sizeof(sha512_context));
sha512_starts(ctx);
*ctxp = ctx;
return 0;
}
static int hash_update_sha512(struct hash_algo *algo, void *ctx,
const void *buf, unsigned int size, int is_last)
{
sha512_update((sha512_context *)ctx, buf, size);
return 0;
}
static int hash_finish_sha512(struct hash_algo *algo, void *ctx, void
*dest_buf, int size)
{
if (size < algo->digest_size)
return -1;
printf("hello world\n");
sha512_finish((sha512_context *)ctx, dest_buf);
free(ctx);
return 0;
}
#endif
static int hash_init_crc16_ccitt(struct hash_algo *algo, void **ctxp)
{
uint16_t *ctx = malloc(sizeof(uint16_t));
......@@ -195,6 +255,28 @@ static struct hash_algo hash_algo[] = {
.hash_finish = hash_finish_sha256,
#endif
},
#endif
#ifdef CONFIG_SHA384
{
.name = "sha384",
.digest_size = SHA384_SUM_LEN,
.chunk_size = CHUNKSZ_SHA384,
.hash_func_ws = sha384_csum_wd,
.hash_init = hash_init_sha384,
.hash_update = hash_update_sha384,
.hash_finish = hash_finish_sha384,
},
#endif
#ifdef CONFIG_SHA512
{
.name = "sha512",
.digest_size = SHA512_SUM_LEN,
.chunk_size = CHUNKSZ_SHA512,
.hash_func_ws = sha512_csum_wd,
.hash_init = hash_init_sha512,
.hash_update = hash_update_sha512,
.hash_finish = hash_finish_sha512,
},
#endif
{
.name = "crc16-ccitt",
......@@ -218,7 +300,8 @@ static struct hash_algo hash_algo[] = {
/* Try to minimize code size for boards that don't want much hashing */
#if defined(CONFIG_SHA256) || defined(CONFIG_CMD_SHA1SUM) || \
defined(CONFIG_CRC32_VERIFY) || defined(CONFIG_CMD_HASH)
defined(CONFIG_CRC32_VERIFY) || defined(CONFIG_CMD_HASH) || \
defined(CONFIG_SHA384) || defined(CONFIG_SHA512)
#define multi_hash() 1
#else
#define multi_hash() 0
......
......@@ -32,6 +32,7 @@ DECLARE_GLOBAL_DATA_PTR;
#include <u-boot/md5.h>
#include <u-boot/sha1.h>
#include <u-boot/sha256.h>
#include <u-boot/sha512.h>
/*****************************************************************************/
/* New uImage format routines */
......@@ -1206,6 +1207,14 @@ int calculate_hash(const void *data, int data_len, const char *algo,
sha256_csum_wd((unsigned char *)data, data_len,
(unsigned char *)value, CHUNKSZ_SHA256);
*value_len = SHA256_SUM_LEN;
} else if (IMAGE_ENABLE_SHA384 && strcmp(algo, "sha384") == 0) {
sha384_csum_wd((unsigned char *)data, data_len,
(unsigned char *)value, CHUNKSZ_SHA384);
*value_len = SHA384_SUM_LEN;
} else if (IMAGE_ENABLE_SHA512 && strcmp(algo, "sha512") == 0) {
sha512_csum_wd((unsigned char *)data, data_len,
(unsigned char *)value, CHUNKSZ_SHA512);
*value_len = SHA512_SUM_LEN;
} else if (IMAGE_ENABLE_MD5 && strcmp(algo, "md5") == 0) {
md5_wd((unsigned char *)data, data_len, value, CHUNKSZ_MD5);
*value_len = 16;
......
......@@ -40,7 +40,31 @@ struct checksum_algo checksum_algos[] = {
.calculate_sign = EVP_sha256,
#endif
.calculate = hash_calculate,
}
},
#ifdef CONFIG_SHA384
{
.name = "sha384",
.checksum_len = SHA384_SUM_LEN,
.der_len = SHA384_DER_LEN,
.der_prefix = sha384_der_prefix,
#if IMAGE_ENABLE_SIGN
.calculate_sign = EVP_sha384,
#endif
.calculate = hash_calculate,
},
#endif
#ifdef CONFIG_SHA512
{
.name = "sha512",
.checksum_len = SHA512_SUM_LEN,
.der_len = SHA512_DER_LEN,
.der_prefix = sha512_der_prefix,
#if IMAGE_ENABLE_SIGN
.calculate_sign = EVP_sha512,
#endif
.calculate = hash_calculate,
},
#endif
};
......
......@@ -412,7 +412,7 @@ config SPL_MD5_SUPPORT
secure as it is possible (with a brute-force attack) to adjust the
image while still retaining the same MD5 hash value. For secure
applications where images may be changed maliciously, you should
consider SHA1 or SHA256.
consider SHA256 or SHA384.
config SPL_SHA1_SUPPORT
bool "Support SHA1"
......@@ -424,7 +424,7 @@ config SPL_SHA1_SUPPORT
image contents have not been corrupted or maliciously altered.
While SHA1 is fairly secure it is coming to the end of its life
due to the expanding computing power available to brute-force
attacks. For more security, consider SHA256.
attacks. For more security, consider SHA256 or SHA384.
config SPL_SHA256_SUPPORT
bool "Support SHA256"
......@@ -433,12 +433,28 @@ config SPL_SHA256_SUPPORT
help
Enable this to support SHA256 in FIT images within SPL. A SHA256
checksum is a 256-bit (32-byte) hash value used to check that the
image contents have not been corrupted. SHA256 is recommended for
use in secure applications since (as at 2016) there is no known
feasible attack that could produce a 'collision' with differing
input data. Use this for the highest security. Note that only the
SHA256 variant is supported: SHA512 and others are not currently
supported in U-Boot.
image contents have not been corrupted.
config SPL_SHA384_SUPPORT
bool "Support SHA384"
depends on SPL_FIT
select SHA384
select SHA512_ALGO
help
Enable this to support SHA384 in FIT images within SPL. A SHA384
checksum is a 384-bit (48-byte) hash value used to check that the
image contents have not been corrupted. Use this for the highest
security.
config SPL_SHA512_SUPPORT
bool "Support SHA512"
depends on SPL_FIT
select SHA512
select SHA512_ALGO
help
Enable this to support SHA512 in FIT images within SPL. A SHA512
checksum is a 512-bit (64-byte) hash value used to check that the
image contents have not been corrupted.
config SPL_FIT_IMAGE_TINY
bool "Remove functionality from SPL FIT loading to reduce size"
......
......@@ -12,7 +12,11 @@ struct cmd_tbl;
* Maximum digest size for all algorithms we support. Having this value
* avoids a malloc() or C99 local declaration in common/cmd_hash.c.
*/
#if defined(CONFIG_SHA384) || defined(CONFIG_SHA512)
#define HASH_MAX_DIGEST_SIZE 64
#else
#define HASH_MAX_DIGEST_SIZE 32
#endif
enum {
HASH_FLAG_VERIFY = 1 << 0, /* Enable verify mode */
......
......@@ -32,8 +32,12 @@ struct fdt_region;
#define CONFIG_FIT_VERBOSE 1 /* enable fit_format_{error,warning}() */
#define CONFIG_FIT_ENABLE_RSASSA_PSS_SUPPORT 1
#define CONFIG_FIT_ENABLE_SHA256_SUPPORT
#define CONFIG_FIT_ENABLE_SHA384_SUPPORT
#define CONFIG_FIT_ENABLE_SHA512_SUPPORT
#define CONFIG_SHA1
#define CONFIG_SHA256
#define CONFIG_SHA384
#define CONFIG_SHA512
#define IMAGE_ENABLE_IGNORE 0
#define IMAGE_INDENT_STRING ""
......@@ -92,6 +96,20 @@ struct fdt_region;
#define IMAGE_ENABLE_SHA256 0
#endif
#if defined(CONFIG_FIT_ENABLE_SHA384_SUPPORT) || \
defined(CONFIG_SPL_SHA384_SUPPORT)
#define IMAGE_ENABLE_SHA384 1
#else
#define IMAGE_ENABLE_SHA384 0
#endif
#if defined(CONFIG_FIT_ENABLE_SHA512_SUPPORT) || \
defined(CONFIG_SPL_SHA512_SUPPORT)
#define IMAGE_ENABLE_SHA512 1
#else
#define IMAGE_ENABLE_SHA512 0
#endif
#endif /* IMAGE_ENABLE_FIT */
#ifdef CONFIG_SYS_BOOT_GET_CMDLINE
......
......@@ -10,6 +10,7 @@
#include <image.h>
#include <u-boot/sha1.h>
#include <u-boot/sha256.h>
#include <u-boot/sha512.h>
/**
* hash_calculate() - Calculate hash over the data
......
#ifndef _SHA512_H
#define _SHA512_H
#define SHA384_SUM_LEN 48
#define SHA384_DER_LEN 19
#define SHA512_SUM_LEN 64
#define SHA512_DER_LEN 19
#define SHA512_BLOCK_SIZE 128
#define CHUNKSZ_SHA384 (16 * 1024)
#define CHUNKSZ_SHA512 (16 * 1024)
typedef struct {
uint64_t state[SHA512_SUM_LEN / 8];
uint64_t count[2];
uint8_t buf[SHA512_BLOCK_SIZE];
} sha512_context;
extern const uint8_t sha512_der_prefix[];
void sha512_starts(sha512_context * ctx);
void sha512_update(sha512_context *ctx, const uint8_t *input, uint32_t length);
void sha512_finish(sha512_context * ctx, uint8_t digest[SHA512_SUM_LEN]);
void sha512_csum_wd(const unsigned char *input, unsigned int ilen,
unsigned char *output, unsigned int chunk_sz);
extern const uint8_t sha384_der_prefix[];
void sha384_starts(sha512_context * ctx);
void sha384_update(sha512_context *ctx, const uint8_t *input, uint32_t length);
void sha384_finish(sha512_context * ctx, uint8_t digest[SHA384_SUM_LEN]);
void sha384_csum_wd(const unsigned char *input, unsigned int ilen,
unsigned char *output, unsigned int chunk_sz);
#endif /* _SHA512_H */
......@@ -345,6 +345,29 @@ config SHA256
The SHA256 algorithm produces a 256-bit (32-byte) hash value
(digest).
config SHA512_ALGO
bool "Enable SHA512 algorithm"
help
This option enables support of internal SHA512 algorithm.
config SHA512
bool "Enable SHA512 support"
depends on SHA512_ALGO
help
This option enables support of hashing using SHA512 algorithm.
The hash is calculated in software.
The SHA512 algorithm produces a 512-bit (64-byte) hash value
(digest).
config SHA384
bool "Enable SHA384 support"
depends on SHA512_ALGO
help
This option enables support of hashing using SHA384 algorithm.
The hash is calculated in software.
The SHA384 algorithm produces a 384-bit (48-byte) hash value
(digest).
config SHA_HW_ACCEL
bool "Enable hashing using hardware"
help
......
......@@ -61,6 +61,7 @@ obj-$(CONFIG_$(SPL_)MD5) += md5.o
obj-$(CONFIG_$(SPL_)RSA) += rsa/
obj-$(CONFIG_SHA1) += sha1.o
obj-$(CONFIG_SHA256) += sha256.o
obj-$(CONFIG_SHA512_ALGO) += sha512.o
obj-$(CONFIG_$(SPL_)ZLIB) += zlib/
obj-$(CONFIG_$(SPL_)ZSTD) += zstd/
......
// SPDX-License-Identifier: GPL-2.0+
/*
* FIPS-180-2 compliant SHA-512 and SHA-384 implementation
*
* SHA-512 code by Jean-Luc Cooke <jlcooke@certainkey.com>
*
* Copyright (c) Jean-Luc Cooke <jlcooke@certainkey.com>
* Copyright (c) Andrew McDonald <andrew@mcdonald.org.uk>
* Copyright (c) 2003 Kyle McMartin <kyle@debian.org>
* Copyright (c) 2020 Reuben Dowle <reuben.dowle@4rf.com>
*/
#ifndef USE_HOSTCC
#include <common.h>
#include <linux/string.h>
#else
#include <string.h>
#endif /* USE_HOSTCC */
#include <watchdog.h>
#include <u-boot/sha512.h>
const uint8_t sha384_der_prefix[SHA384_DER_LEN] = {
0x30, 0x41, 0x30, 0x0d, 0x06, 0x09, 0x60, 0x86,
0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x02, 0x05,
0x00, 0x04, 0x30
};
const uint8_t sha512_der_prefix[SHA512_DER_LEN] = {
0x30, 0x51, 0x30, 0x0d, 0x06, 0x09, 0x60, 0x86,
0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x03, 0x05,
0x00, 0x04, 0x40
};
#define SHA384_H0 0xcbbb9d5dc1059ed8ULL
#define SHA384_H1 0x629a292a367cd507ULL
#define SHA384_H2 0x9159015a3070dd17ULL
#define SHA384_H3 0x152fecd8f70e5939ULL
#define SHA384_H4 0x67332667ffc00b31ULL
#define SHA384_H5 0x8eb44a8768581511ULL
#define SHA384_H6 0xdb0c2e0d64f98fa7ULL
#define SHA384_H7 0x47b5481dbefa4fa4ULL
#define SHA512_H0 0x6a09e667f3bcc908ULL
#define SHA512_H1 0xbb67ae8584caa73bULL
#define SHA512_H2 0x3c6ef372fe94f82bULL
#define SHA512_H3 0xa54ff53a5f1d36f1ULL
#define SHA512_H4 0x510e527fade682d1ULL
#define SHA512_H5 0x9b05688c2b3e6c1fULL
#define SHA512_H6 0x1f83d9abfb41bd6bULL
#define SHA512_H7 0x5be0cd19137e2179ULL
static inline uint64_t Ch(uint64_t x, uint64_t y, uint64_t z)
{
return z ^ (x & (y ^ z));
}
static inline uint64_t Maj(uint64_t x, uint64_t y, uint64_t z)
{
return (x & y) | (z & (x | y));
}
static const uint64_t sha512_K[80] = {
0x428a2f98d728ae22ULL, 0x7137449123ef65cdULL, 0xb5c0fbcfec4d3b2fULL,
0xe9b5dba58189dbbcULL, 0x3956c25bf348b538ULL, 0x59f111f1b605d019ULL,
0x923f82a4af194f9bULL, 0xab1c5ed5da6d8118ULL, 0xd807aa98a3030242ULL,
0x12835b0145706fbeULL, 0x243185be4ee4b28cULL, 0x550c7dc3d5ffb4e2ULL,
0x72be5d74f27b896fULL, 0x80deb1fe3b1696b1ULL, 0x9bdc06a725c71235ULL,
0xc19bf174cf692694ULL, 0xe49b69c19ef14ad2ULL, 0xefbe4786384f25e3ULL,
0x0fc19dc68b8cd5b5ULL, 0x240ca1cc77ac9c65ULL, 0x2de92c6f592b0275ULL,
0x4a7484aa6ea6e483ULL, 0x5cb0a9dcbd41fbd4ULL, 0x76f988da831153b5ULL,
0x983e5152ee66dfabULL, 0xa831c66d2db43210ULL, 0xb00327c898fb213fULL,
0xbf597fc7beef0ee4ULL, 0xc6e00bf33da88fc2ULL, 0xd5a79147930aa725ULL,
0x06ca6351e003826fULL, 0x142929670a0e6e70ULL, 0x27b70a8546d22ffcULL,
0x2e1b21385c26c926ULL, 0x4d2c6dfc5ac42aedULL, 0x53380d139d95b3dfULL,
0x650a73548baf63deULL, 0x766a0abb3c77b2a8ULL, 0x81c2c92e47edaee6ULL,
0x92722c851482353bULL, 0xa2bfe8a14cf10364ULL, 0xa81a664bbc423001ULL,
0xc24b8b70d0f89791ULL, 0xc76c51a30654be30ULL, 0xd192e819d6ef5218ULL,
0xd69906245565a910ULL, 0xf40e35855771202aULL, 0x106aa07032bbd1b8ULL,
0x19a4c116b8d2d0c8ULL, 0x1e376c085141ab53ULL, 0x2748774cdf8eeb99ULL,
0x34b0bcb5e19b48a8ULL, 0x391c0cb3c5c95a63ULL, 0x4ed8aa4ae3418acbULL,
0x5b9cca4f7763e373ULL, 0x682e6ff3d6b2b8a3ULL, 0x748f82ee5defb2fcULL,
0x78a5636f43172f60ULL, 0x84c87814a1f0ab72ULL, 0x8cc702081a6439ecULL,
0x90befffa23631e28ULL, 0xa4506cebde82bde9ULL, 0xbef9a3f7b2c67915ULL,
0xc67178f2e372532bULL, 0xca273eceea26619cULL, 0xd186b8c721c0c207ULL,
0xeada7dd6cde0eb1eULL, 0xf57d4f7fee6ed178ULL, 0x06f067aa72176fbaULL,
0x0a637dc5a2c898a6ULL, 0x113f9804bef90daeULL, 0x1b710b35131c471bULL,
0x28db77f523047d84ULL, 0x32caab7b40c72493ULL, 0x3c9ebe0a15c9bebcULL,
0x431d67c49c100d4cULL, 0x4cc5d4becb3e42b6ULL, 0x597f299cfc657e2aULL,
0x5fcb6fab3ad6faecULL, 0x6c44198c4a475817ULL,
};
static inline uint64_t ror64(uint64_t word, unsigned int shift)
{
return (word >> (shift & 63)) | (word << ((-shift) & 63));
}
#define e0(x) (ror64(x,28) ^ ror64(x,34) ^ ror64(x,39))
#define e1(x) (ror64(x,14) ^ ror64(x,18) ^ ror64(x,41))
#define s0(x) (ror64(x, 1) ^ ror64(x, 8) ^ (x >> 7))
#define s1(x) (ror64(x,19) ^ ror64(x,61) ^ (x >> 6))
/*
* 64-bit integer manipulation macros (big endian)
*/
#ifndef GET_UINT64_BE
#define GET_UINT64_BE(n,b,i) { \
(n) = ( (unsigned long long) (b)[(i) ] << 56 ) \
| ( (unsigned long long) (b)[(i) + 1] << 48 ) \
| ( (unsigned long long) (b)[(i) + 2] << 40 ) \
| ( (unsigned long long) (b)[(i) + 3] << 32 ) \
| ( (unsigned long long) (b)[(i) + 4] << 24 ) \
| ( (unsigned long long) (b)[(i) + 5] << 16 ) \
| ( (unsigned long long) (b)[(i) + 6] << 8 ) \
| ( (unsigned long long) (b)[(i) + 7] ); \
}
#endif
#ifndef PUT_UINT64_BE
#define PUT_UINT64_BE(n,b,i) { \
(b)[(i) ] = (unsigned char) ( (n) >> 56 ); \
(b)[(i) + 1] = (unsigned char) ( (n) >> 48 ); \
(b)[(i) + 2] = (unsigned char) ( (n) >> 40 ); \
(b)[(i) + 3] = (unsigned char) ( (n) >> 32 ); \
(b)[(i) + 4] = (unsigned char) ( (n) >> 24 ); \
(b)[(i) + 5] = (unsigned char) ( (n) >> 16 ); \
(b)[(i) + 6] = (unsigned char) ( (n) >> 8 ); \
(b)[(i) + 7] = (unsigned char) ( (n) ); \
}
#endif
static inline void LOAD_OP(int I, uint64_t *W, const uint8_t *input)
{
GET_UINT64_BE(W[I], input, I*8);
}
static inline void BLEND_OP(int I, uint64_t *W)
{
W[I & 15] += s1(W[(I-2) & 15]) + W[(I-7) & 15] + s0(W[(I-15) & 15]);
}
static void
sha512_transform(uint64_t *state, const uint8_t *input)
{
uint64_t a, b, c, d, e, f, g, h, t1, t2;
int i;
uint64_t W[16];
/* load the state into our registers */
a=state[0]; b=state[1]; c=state[2]; d=state[3];
e=state[4]; f=state[5]; g=state[6]; h=state[7];
/* now iterate */
for (i=0; i<80; i+=8) {
if (!(i & 8)) {
int j;
if (i < 16) {
/* load the input */
for (j = 0; j < 16; j++)
LOAD_OP(i + j, W, input);
} else {
for (j = 0; j < 16; j++) {
BLEND_OP(i + j, W);
}
}
}
t1 = h + e1(e) + Ch(e,f,g) + sha512_K[i ] + W[(i & 15)];
t2 = e0(a) + Maj(a,b,c); d+=t1; h=t1+t2;
t1 = g + e1(d) + Ch(d,e,f) + sha512_K[i+1] + W[(i & 15) + 1];
t2 = e0(h) + Maj(h,a,b); c+=t1; g=t1+t2;
t1 = f + e1(c) + Ch(c,d,e) + sha512_K[i+2] + W[(i & 15) + 2];
t2 = e0(g) + Maj(g,h,a); b+=t1; f=t1+t2;
t1 = e + e1(b) + Ch(b,c,d) + sha512_K[i+3] + W[(i & 15) + 3];
t2 = e0(f) + Maj(f,g,h); a+=t1; e=t1+t2;
t1 = d + e1(a) + Ch(a,b,c) + sha512_K[i+4] + W[(i & 15) + 4];
t2 = e0(e) + Maj(e,f,g); h+=t1; d=t1+t2;
t1 = c + e1(h) + Ch(h,a,b) + sha512_K[i+5] + W[(i & 15) + 5];
t2 = e0(d) + Maj(d,e,f); g+=t1; c=t1+t2;
t1 = b + e1(g) + Ch(g,h,a) + sha512_K[i+6] + W[(i & 15) + 6];
t2 = e0(c) + Maj(c,d,e); f+=t1; b=t1+t2;
t1 = a + e1(f) + Ch(f,g,h) + sha512_K[i+7] + W[(i & 15) + 7];
t2 = e0(b) + Maj(b,c,d); e+=t1; a=t1+t2;
}
state[0] += a; state[1] += b; state[2] += c; state[3] += d;
state[4] += e; state[5] += f; state[6] += g; state[7] += h;
/* erase our data */
a = b = c = d = e = f = g = h = t1 = t2 = 0;
}
static void sha512_block_fn(sha512_context *sst, const uint8_t *src,
int blocks)
{
while (blocks--) {
sha512_transform(sst->state, src);
src += SHA512_BLOCK_SIZE;
}
}
static void sha512_base_do_update(sha512_context *sctx,
const uint8_t *data,
unsigned int len)
{
unsigned int partial = sctx->count[0] % SHA512_BLOCK_SIZE;
sctx->count[0] += len;
if (sctx->count[0] < len)
sctx->count[1]++;
if (unlikely((partial + len) >= SHA512_BLOCK_SIZE)) {
int blocks;
if (partial) {
int p = SHA512_BLOCK_SIZE - partial;
memcpy(sctx->buf + partial, data, p);
data += p;
len -= p;
sha512_block_fn(sctx, sctx->buf, 1);
}
blocks = len / SHA512_BLOCK_SIZE;
len %= SHA512_BLOCK_SIZE;
if (blocks) {
sha512_block_fn(sctx, data, blocks);
data += blocks * SHA512_BLOCK_SIZE;
}
partial = 0;
}
if (len)
memcpy(sctx->buf + partial, data, len);
}