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Add support for CHAP using SHA1

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Signed-off-by: Ronnie Sahlberg <ronniesahlberg@gmail.com>
This commit is contained in:
Ronnie Sahlberg
2025-01-03 23:43:55 +10:00
parent a92b41318c
commit 95a0d98cfd
12 changed files with 966 additions and 49 deletions
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2
lib/Makefile.am
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@@ -6,7 +6,7 @@ libiscsipriv_la_SOURCES = \
connect.c crc32c.c discovery.c init.c \
login.c nop.c pdu.c iscsi-command.c \
scsi-lowlevel.c socket.c sync.c task_mgmt.c \
logging.c utils.c
logging.c utils.c sha1.c
if TARGET_OS_IS_WIN32
libiscsipriv_la_SOURCES += ../win32/win32_compat.c

27
lib/init.c
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@@ -251,6 +251,7 @@ iscsi_create_context(const char *initiator_name)
iscsi->tcp_keepidle=30;
iscsi->reconnect_max_retries = -1;
iscsi->chap_auth = ISCSI_CHAP_MD5;
if (getenv("LIBISCSI_DEBUG") != NULL) {
iscsi_set_log_level(iscsi, atoi(getenv("LIBISCSI_DEBUG")));
@@ -622,6 +623,19 @@ iscsi_parse_url(struct iscsi_context *iscsi, const char *url, int full)
if (value != NULL) {
*value++ = 0;
}
if (!strcmp(key, "auth")) {
if (!strcmp(value, "md5")) {
iscsi->chap_auth = ISCSI_CHAP_MD5;
} else if (!strcmp(value, "sha1")) {
iscsi->chap_auth = ISCSI_CHAP_SHA_1;
#if 0
} else if (!strcmp(value, "sha-256")) {
iscsi->chap_auth = ISCSI_CHAP_SHA_256;
} else if (!strcmp(value, "sha3-256")) {
iscsi->chap_auth = ISCSI_CHAP_SHA3_256;
#endif
}
}
if (!strcmp(key, "header_digest")) {
if (!strcmp(value, "crc32c")) {
iscsi_set_header_digest(
@@ -873,3 +887,16 @@ iscsi_set_fd_dup_cb(struct iscsi_context *iscsi,
iscsi->fd_dup_cb = cb;
iscsi->fd_dup_opaque = opaque;
}
enum iscsi_chap_auth
iscsi_get_auth(struct iscsi_context *iscsi)
{
return iscsi->chap_auth;
}
void
iscsi_set_auth(struct iscsi_context *iscsi, enum iscsi_chap_auth auth)
{
iscsi->chap_auth = auth;
}

2
lib/libiscsi.def
View File

@@ -14,6 +14,7 @@ iscsi_free_discovery_data
iscsi_force_reconnect
iscsi_full_connect_async
iscsi_full_connect_sync
iscsi_get_auth
iscsi_get_error
iscsi_get_fd
iscsi_get_lba_status_sync
@@ -111,6 +112,7 @@ iscsi_scsi_command_sync
iscsi_scsi_cancel_task
iscsi_service
iscsi_set_alias
iscsi_set_auth
iscsi_set_immediate_data
iscsi_set_initial_r2t
iscsi_set_log_level

2
lib/libiscsi.syms.in
View File

@@ -17,6 +17,7 @@ iscsi_force_reconnect
iscsi_force_reconnect_sync
iscsi_full_connect_async
iscsi_full_connect_sync
iscsi_get_auth
iscsi_get_error
iscsi_get_fd
iscsi_get_lba_status_sync
@@ -114,6 +115,7 @@ iscsi_scsi_command_sync
iscsi_scsi_is_task_in_outqueue
iscsi_service
iscsi_set_alias
iscsi_set_auth
iscsi_set_bind_interfaces
iscsi_set_cache_allocations
iscsi_set_header_digest

143
lib/login.c
View File

@@ -44,6 +44,7 @@
#include "iscsi-private.h"
#include "scsi-lowlevel.h"
#include "md5.h"
#include "sha.h"
#ifdef HAVE_LIBGNUTLS
#include <gnutls/crypto.h>
@@ -562,7 +563,10 @@ iscsi_login_add_authalgorithm(struct iscsi_context *iscsi, struct iscsi_pdu *pdu
return 0;
}
strncpy(str,"CHAP_A=5",MAX_STRING_SIZE);
if (snprintf(str, MAX_STRING_SIZE, "CHAP_A=%d", iscsi->chap_auth) == -1) {
iscsi_set_error(iscsi, "Out-of-memory: snprintf failed.");
return -1;
}
if (iscsi_pdu_add_data(iscsi, pdu, (unsigned char *)str, strlen(str)+1)
!= 0) {
iscsi_set_error(iscsi, "Out-of-memory: pdu add data failed.");
@@ -702,6 +706,7 @@ i2h(int i)
return i + '0';
}
#if defined HAVE_LIBGNUTLS
#define md5_context_t gnutls_hash_hd_t
#define md5_open(hd) gnutls_hash_init(hd, GNUTLS_DIG_MD5)
@@ -757,19 +762,74 @@ static inline void md5_putc(md5_context_t h, unsigned char c)
md5_write(h, &c, 1);
}
/* size of the challenge used for bidirectional chap */
#define TARGET_CHAP_C_SIZE 32
static void compute_chap_r_md5(struct iscsi_context *iscsi, int chap_i,
unsigned char *passwd,
unsigned char *chap_c,
unsigned char *digest)
{
unsigned char *strp;
unsigned char c;
md5_context_t ctx;
md5_open(&ctx);
md5_putc(ctx, chap_i);
md5_write(ctx, passwd, strlen((char *)passwd));
strp = chap_c;
while (*strp != 0) {
c = (h2i(strp[0]) << 4) | h2i(strp[1]);
strp += 2;
md5_putc(ctx, c);
}
md5_read(ctx, digest);
md5_close(ctx);
}
static void compute_chap_r_sha1(struct iscsi_context *iscsi, int chap_i,
unsigned char *passwd,
unsigned char *chap_c,
unsigned char *digest)
{
unsigned char *strp;
unsigned char c;
SHA1Context ctx;
SHA1Reset(&ctx);
c = chap_i;
SHA1Input(&ctx, &c, 1);
SHA1Input(&ctx, passwd, strlen((char *)passwd));
strp = chap_c;
while (*strp != 0) {
c = (h2i(strp[0]) << 4) | h2i(strp[1]);
strp += 2;
SHA1Input(&ctx, &c, 1);
}
SHA1Result(&ctx, digest);
}
static void compute_chap_r(struct iscsi_context *iscsi, int chap_i,
unsigned char *passwd,
unsigned char *chap_c,
unsigned char *digest)
{
switch (iscsi->chap_auth) {
case ISCSI_CHAP_MD5:
return compute_chap_r_md5(iscsi, chap_i, passwd, chap_c, digest);
case ISCSI_CHAP_SHA_1:
return compute_chap_r_sha1(iscsi, chap_i, passwd, chap_c, digest);
}
}
static int
iscsi_login_add_chap_response(struct iscsi_context *iscsi, struct iscsi_pdu *pdu)
{
char str[MAX_STRING_SIZE+1];
char * strp;
unsigned char c, cc[2];
unsigned char digest[CHAP_R_SIZE];
md5_context_t ctx;
char digest[MAX_CHAP_R_SIZE];
int i;
int chap_r_size = 0;
if (iscsi->current_phase != ISCSI_PDU_LOGIN_CSG_SECNEG
|| iscsi->secneg_phase != ISCSI_LOGIN_SECNEG_PHASE_SEND_RESPONSE) {
return 0;
@@ -780,22 +840,19 @@ iscsi_login_add_chap_response(struct iscsi_context *iscsi, struct iscsi_pdu *pdu
return -1;
}
md5_open(&ctx);
if (ctx == NULL) {
iscsi_set_error(iscsi, "Cannot create MD5 algorithm");
return -1;
}
md5_putc(ctx, iscsi->chap_i);
md5_write(ctx, (unsigned char *)iscsi->passwd, strlen(iscsi->passwd));
strp = iscsi->chap_c;
while (*strp != 0) {
c = (h2i(strp[0]) << 4) | h2i(strp[1]);
strp += 2;
md5_putc(ctx, c);
}
md5_read(ctx, digest);
md5_close(ctx);
switch (iscsi->chap_auth) {
case ISCSI_CHAP_MD5:
chap_r_size = 16;
break;
case ISCSI_CHAP_SHA_1:
chap_r_size = 20;
break;
}
compute_chap_r(iscsi, iscsi->chap_i,
(unsigned char *)iscsi->passwd,
(unsigned char *)iscsi->chap_c,
(unsigned char *)digest);
strncpy(str,"CHAP_R=0x",MAX_STRING_SIZE);
if (iscsi_pdu_add_data(iscsi, pdu, (unsigned char *)str, strlen(str))
@@ -804,7 +861,7 @@ iscsi_login_add_chap_response(struct iscsi_context *iscsi, struct iscsi_pdu *pdu
return -1;
}
for (i = 0; i < CHAP_R_SIZE; i++) {
for (i = 0; i < chap_r_size; i++) {
c = digest[i];
cc[0] = i2h((c >> 4)&0x0f);
cc[1] = i2h((c )&0x0f);
@@ -824,7 +881,7 @@ iscsi_login_add_chap_response(struct iscsi_context *iscsi, struct iscsi_pdu *pdu
/* bidirectional chap */
if (iscsi->target_user[0]) {
unsigned char target_chap_c[TARGET_CHAP_C_SIZE];
char target_chap_c[MAX_CHAP_R_SIZE * 2];
iscsi->target_chap_i++;
snprintf(str, MAX_STRING_SIZE, "CHAP_I=%d",
@@ -836,7 +893,7 @@ iscsi_login_add_chap_response(struct iscsi_context *iscsi, struct iscsi_pdu *pdu
return -1;
}
for (i = 0; i < TARGET_CHAP_C_SIZE; i++) {
for (i = 0; i < chap_r_size * 2; i++) {
target_chap_c[i] = rand()&0xff;
}
strncpy(str, "CHAP_C=0x", MAX_STRING_SIZE);
@@ -846,7 +903,7 @@ iscsi_login_add_chap_response(struct iscsi_context *iscsi, struct iscsi_pdu *pdu
"failed.");
return -1;
}
for (i = 0; i < TARGET_CHAP_C_SIZE; i++) {
for (i = 0; i < chap_r_size * 2; i++) {
c = target_chap_c[i];
cc[0] = i2h((c >> 4)&0x0f);
cc[1] = i2h((c )&0x0f);
@@ -863,19 +920,10 @@ iscsi_login_add_chap_response(struct iscsi_context *iscsi, struct iscsi_pdu *pdu
return -1;
}
md5_open(&ctx);
if (ctx == NULL) {
iscsi_set_error(iscsi, "Cannot create MD5 algorithm");
return -1;
}
md5_putc(ctx, iscsi->target_chap_i);
md5_write(ctx, (unsigned char *)iscsi->target_passwd,
strlen(iscsi->target_passwd));
md5_write(ctx, (unsigned char *)target_chap_c,
TARGET_CHAP_C_SIZE);
md5_read(ctx, iscsi->target_chap_r);
md5_close(ctx);
compute_chap_r(iscsi, iscsi->target_chap_i,
(unsigned char *)iscsi->target_passwd,
(unsigned char *)target_chap_c,
(unsigned char *)iscsi->target_chap_r);
}
return 0;
@@ -1338,9 +1386,18 @@ iscsi_process_login_reply(struct iscsi_context *iscsi, struct iscsi_pdu *pdu,
}
if (!strncmp(ptr, "CHAP_R=0x", 9)) {
int i;
int i, chap_r_size = 0;
if (len != 9 + 2 * CHAP_R_SIZE) {
switch (iscsi->chap_auth) {
case ISCSI_CHAP_MD5:
chap_r_size = 16;
break;
case ISCSI_CHAP_SHA_1:
chap_r_size = 20;
break;
}
if (len != 9 + 2 * chap_r_size) {
iscsi_set_error(iscsi, "Wrong size of CHAP_R"
" received from target.");
if (pdu->callback) {
@@ -1349,7 +1406,7 @@ iscsi_process_login_reply(struct iscsi_context *iscsi, struct iscsi_pdu *pdu,
}
return 0;
}
for (i = 0; i < CHAP_R_SIZE; i++) {
for (i = 0; i < chap_r_size; i++) {
unsigned char c;
c = ((h2i(ptr[9 + 2 * i]) << 4) | h2i(ptr[9 + 2 * i + 1]));
if (c != iscsi->target_chap_r[i]) {

448
lib/sha1.c Normal file
View File

@@ -0,0 +1,448 @@
/**************************** sha1.c ****************************/
/******************** See RFC 4634 for details ******************/
/*
* Description:
* This file implements the Secure Hash Signature Standard
* algorithms as defined in the National Institute of Standards
* and Technology Federal Information Processing Standards
* Publication (FIPS PUB) 180-1 published on April 17, 1995, 180-2
* published on August 1, 2002, and the FIPS PUB 180-2 Change
* Notice published on February 28, 2004.
*
* A combined document showing all algorithms is available at
* http://csrc.nist.gov/publications/fips/
* fips180-2/fips180-2withchangenotice.pdf
*
* The SHA-1 algorithm produces a 160-bit message digest for a
* given data stream. It should take about 2**n steps to find a
* message with the same digest as a given message and
* 2**(n/2) to find any two messages with the same digest,
* when n is the digest size in bits. Therefore, this
* algorithm can serve as a means of providing a
* "fingerprint" for a message.
*
* Portability Issues:
* SHA-1 is defined in terms of 32-bit "words". This code
* uses <stdint.h> (included via "sha.h") to define 32 and 8
* bit unsigned integer types. If your C compiler does not
* support 32 bit unsigned integers, this code is not
* appropriate.
*
* Caveats:
* SHA-1 is designed to work with messages less than 2^64 bits
* long. This implementation uses SHA1Input() to hash the bits
* that are a multiple of the size of an 8-bit character, and then
* uses SHA1FinalBits() to hash the final few bits of the input.
*/
#include "sha.h"
#include "sha-private.h"
#if defined(USE_SHA1) && USE_SHA1
/*
* Define the SHA1 circular left shift macro
*/
#define SHA1_ROTL(bits,word) \
(((word) << (bits)) | ((word) >> (32-(bits))))
/*
* add "length" to the length
*/
#define SHA1AddLength(context, length) \
(addTemp = (context)->Length_Low, \
(context)->Corrupted = \
(((context)->Length_Low += (length)) < addTemp) && \
(++(context)->Length_High == 0) ? 1 : 0)
/* Local Function Prototypes */
static void SHA1Finalize (SHA1Context * context, uint8_t Pad_Byte);
static void SHA1PadMessage (SHA1Context *, uint8_t Pad_Byte);
static void SHA1ProcessMessageBlock (SHA1Context *);
/*
* SHA1Reset
*
* Description:
* This function will initialize the SHA1Context in preparation
* for computing a new SHA1 message digest.
*
* Parameters:
* context: [in/out]
* The context to reset.
*
* Returns:
* sha Error Code.
*
*/
int
SHA1Reset (SHA1Context * context)
{
if (!context)
return shaNull;
context->Length_Low = 0;
context->Length_High = 0;
context->Message_Block_Index = 0;
/* Initial Hash Values: FIPS-180-2 section 5.3.1 */
context->Intermediate_Hash[0] = 0x67452301;
context->Intermediate_Hash[1] = 0xEFCDAB89;
context->Intermediate_Hash[2] = 0x98BADCFE;
context->Intermediate_Hash[3] = 0x10325476;
context->Intermediate_Hash[4] = 0xC3D2E1F0;
context->Computed = 0;
context->Corrupted = 0;
return shaSuccess;
}
/*
* SHA1Input
*
* Description:
* This function accepts an array of octets as the next portion
* of the message.
*
* Parameters:
* context: [in/out]
* The SHA context to update
* message_array: [in]
* An array of characters representing the next portion of
* the message.
* length: [in]
* The length of the message in message_array
*
* Returns:
* sha Error Code.
*
*/
int
SHA1Input (SHA1Context * context,
const uint8_t * message_array, size_t length)
{
uint32_t addTemp;
if (!length)
return shaSuccess;
if (!context || !message_array)
return shaNull;
if (context->Computed)
{
context->Corrupted = shaStateError;
return shaStateError;
}
if (context->Corrupted)
return context->Corrupted;
while (length-- && !context->Corrupted)
{
context->Message_Block[context->Message_Block_Index++] =
(*message_array & 0xFF);
if (!SHA1AddLength (context, 8) &&
(context->Message_Block_Index == SHA1_Message_Block_Size))
SHA1ProcessMessageBlock (context);
message_array++;
}
return shaSuccess;
}
/*
* SHA1FinalBits
*
* Description:
* This function will add in any final bits of the message.
*
* Parameters:
* context: [in/out]
* The SHA context to update
* message_bits: [in]
* The final bits of the message, in the upper portion of the
* byte. (Use 0b###00000 instead of 0b00000### to input the
* three bits ###.)
* length: [in]
* The number of bits in message_bits, between 1 and 7.
*
* Returns:
* sha Error Code.
*/
int
SHA1FinalBits (SHA1Context * context, const uint8_t message_bits,
size_t length)
{
uint32_t addTemp;
uint8_t masks[8] = {
/* 0 0b00000000 */ 0x00, /* 1 0b10000000 */ 0x80,
/* 2 0b11000000 */ 0xC0, /* 3 0b11100000 */ 0xE0,
/* 4 0b11110000 */ 0xF0, /* 5 0b11111000 */ 0xF8,
/* 6 0b11111100 */ 0xFC, /* 7 0b11111110 */ 0xFE
};
uint8_t markbit[8] = {
/* 0 0b10000000 */ 0x80, /* 1 0b01000000 */ 0x40,
/* 2 0b00100000 */ 0x20, /* 3 0b00010000 */ 0x10,
/* 4 0b00001000 */ 0x08, /* 5 0b00000100 */ 0x04,
/* 6 0b00000010 */ 0x02, /* 7 0b00000001 */ 0x01
};
if (!length)
return shaSuccess;
if (!context)
return shaNull;
if (context->Computed || (length >= 8) || (length == 0))
{
context->Corrupted = shaStateError;
return shaStateError;
}
if (context->Corrupted)
return context->Corrupted;
SHA1AddLength (context, length);
SHA1Finalize (context,
(uint8_t) ((message_bits & masks[length]) | markbit[length]));
return shaSuccess;
}
/*
* SHA1Result
*
* Description:
* This function will return the 160-bit message digest into the
* Message_Digest array provided by the caller.
* NOTE: The first octet of hash is stored in the 0th element,
* the last octet of hash in the 19th element.
*
* Parameters:
* context: [in/out]
* The context to use to calculate the SHA-1 hash.
* Message_Digest: [out]
* Where the digest is returned.
*
* Returns:
* sha Error Code.
*
*/
int
SHA1Result (SHA1Context * context, uint8_t Message_Digest[SHA1HashSize])
{
int i;
if (!context || !Message_Digest)
return shaNull;
if (context->Corrupted)
return context->Corrupted;
if (!context->Computed)
SHA1Finalize (context, 0x80);
for (i = 0; i < SHA1HashSize; ++i)
Message_Digest[i] = (uint8_t) (context->Intermediate_Hash[i >> 2]
>> 8 * (3 - (i & 0x03)));
return shaSuccess;
}
/*
* SHA1Finalize
*
* Description:
* This helper function finishes off the digest calculations.
*
* Parameters:
* context: [in/out]
* The SHA context to update
* Pad_Byte: [in]
* The last byte to add to the digest before the 0-padding
* and length. This will contain the last bits of the message
* followed by another single bit. If the message was an
* exact multiple of 8-bits long, Pad_Byte will be 0x80.
*
* Returns:
* sha Error Code.
*
*/
static void
SHA1Finalize (SHA1Context * context, uint8_t Pad_Byte)
{
int i;
SHA1PadMessage (context, Pad_Byte);
/* message may be sensitive, clear it out */
for (i = 0; i < SHA1_Message_Block_Size; ++i)
context->Message_Block[i] = 0;
context->Length_Low = 0; /* and clear length */
context->Length_High = 0;
context->Computed = 1;
}
/*
* SHA1PadMessage
*
* Description:
* According to the standard, the message must be padded to an
* even 512 bits. The first padding bit must be a '1'. The last
* 64 bits represent the length of the original message. All bits
* in between should be 0. This helper function will pad the
* message according to those rules by filling the Message_Block
* array accordingly. When it returns, it can be assumed that the
* message digest has been computed.
*
* Parameters:
* context: [in/out]
* The context to pad
* Pad_Byte: [in]
* The last byte to add to the digest before the 0-padding
* and length. This will contain the last bits of the message
* followed by another single bit. If the message was an
* exact multiple of 8-bits long, Pad_Byte will be 0x80.
*
* Returns:
* Nothing.
*/
static void
SHA1PadMessage (SHA1Context * context, uint8_t Pad_Byte)
{
/*
* Check to see if the current message block is too small to hold
* the initial padding bits and length. If so, we will pad the
* block, process it, and then continue padding into a second
* block.
*/
if (context->Message_Block_Index >= (SHA1_Message_Block_Size - 8))
{
context->Message_Block[context->Message_Block_Index++] = Pad_Byte;
while (context->Message_Block_Index < SHA1_Message_Block_Size)
context->Message_Block[context->Message_Block_Index++] = 0;
SHA1ProcessMessageBlock (context);
}
else
context->Message_Block[context->Message_Block_Index++] = Pad_Byte;
while (context->Message_Block_Index < (SHA1_Message_Block_Size - 8))
context->Message_Block[context->Message_Block_Index++] = 0;
/*
* Store the message length as the last 8 octets
*/
context->Message_Block[56] = (uint8_t) (context->Length_High >> 24);
context->Message_Block[57] = (uint8_t) (context->Length_High >> 16);
context->Message_Block[58] = (uint8_t) (context->Length_High >> 8);
context->Message_Block[59] = (uint8_t) (context->Length_High);
context->Message_Block[60] = (uint8_t) (context->Length_Low >> 24);
context->Message_Block[61] = (uint8_t) (context->Length_Low >> 16);
context->Message_Block[62] = (uint8_t) (context->Length_Low >> 8);
context->Message_Block[63] = (uint8_t) (context->Length_Low);
SHA1ProcessMessageBlock (context);
}
/*
* SHA1ProcessMessageBlock
*
* Description:
* This helper function will process the next 512 bits of the
* message stored in the Message_Block array.
*
* Parameters:
* None.
*
* Returns:
* Nothing.
*
* Comments:
* Many of the variable names in this code, especially the
* single character names, were used because those were the
* names used in the publication.
*/
static void
SHA1ProcessMessageBlock (SHA1Context * context)
{
/* Constants defined in FIPS-180-2, section 4.2.1 */
const uint32_t K[4] = {
0x5A827999, 0x6ED9EBA1, 0x8F1BBCDC, 0xCA62C1D6
};
int t; /* Loop counter */
uint32_t temp; /* Temporary word value */
uint32_t W[80]; /* Word sequence */
uint32_t A, B, C, D, E; /* Word buffers */
/*
* Initialize the first 16 words in the array W
*/
for (t = 0; t < 16; t++)
{
W[t] = ((uint32_t) context->Message_Block[t * 4]) << 24;
W[t] |= ((uint32_t) context->Message_Block[t * 4 + 1]) << 16;
W[t] |= ((uint32_t) context->Message_Block[t * 4 + 2]) << 8;
W[t] |= ((uint32_t) context->Message_Block[t * 4 + 3]);
}
for (t = 16; t < 80; t++)
W[t] = SHA1_ROTL (1, W[t - 3] ^ W[t - 8] ^ W[t - 14] ^ W[t - 16]);
A = context->Intermediate_Hash[0];
B = context->Intermediate_Hash[1];
C = context->Intermediate_Hash[2];
D = context->Intermediate_Hash[3];
E = context->Intermediate_Hash[4];
for (t = 0; t < 20; t++)
{
temp = SHA1_ROTL (5, A) + SHA_Ch (B, C, D) + E + W[t] + K[0];
E = D;
D = C;
C = SHA1_ROTL (30, B);
B = A;
A = temp;
}
for (t = 20; t < 40; t++)
{
temp = SHA1_ROTL (5, A) + SHA_Parity (B, C, D) + E + W[t] + K[1];
E = D;
D = C;
C = SHA1_ROTL (30, B);
B = A;
A = temp;
}
for (t = 40; t < 60; t++)
{
temp = SHA1_ROTL (5, A) + SHA_Maj (B, C, D) + E + W[t] + K[2];
E = D;
D = C;
C = SHA1_ROTL (30, B);
B = A;
A = temp;
}
for (t = 60; t < 80; t++)
{
temp = SHA1_ROTL (5, A) + SHA_Parity (B, C, D) + E + W[t] + K[3];
E = D;
D = C;
C = SHA1_ROTL (30, B);
B = A;
A = temp;
}
context->Intermediate_Hash[0] += A;
context->Intermediate_Hash[1] += B;
context->Intermediate_Hash[2] += C;
context->Intermediate_Hash[3] += D;
context->Intermediate_Hash[4] += E;
context->Message_Block_Index = 0;
}
#endif /* defined(USE_SHA1) && USE_SHA1 */