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core: replace SHA1() function by SHA1_uint32()

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The SHA1() helper function was only used when calculating a
SHA1 hash and taking the first four bytes of it as uint32.

Make that explicit by renaming the function into SHA1_uint32()
and directly returning an uint32_t.

Note that the usage in cochran.cpp is sketchy: it generates
a four-byte hash out of two-byte data. Why!?

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
This commit is contained in:
Berthold Stoeger 2024-04-23 15:28:11 +08:00
parent c84e0aa1c3
commit 6a7cec11bf
4 changed files with 17 additions and 18 deletions
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7
core/cochran.cpp
View file

@ -610,7 +610,6 @@ static void cochran_parse_dive(const unsigned char *decode, unsigned mod,
struct dive *dive;
struct divecomputer *dc;
struct tm tm = {0};
uint32_t csum[5];
double max_depth, avg_depth, min_temp;
unsigned int duration = 0, corrupt_dive = 0;
@ -719,8 +718,7 @@ static void cochran_parse_dive(const unsigned char *decode, unsigned mod,
* (double) log[CMD_ALTITUDE] * 250 * FEET, 5.25588) * 1000);
dc->salinity = 10000 + 150 * log[CMD_WATER_CONDUCTIVITY];
SHA1(log + CMD_NUMBER, 2, (unsigned char *)csum);
dc->diveid = csum[0];
dc->diveid = SHA1_uint32(log + CMD_NUMBER, 2);
if (log[CMD_MAX_DEPTH] == 0xff && log[CMD_MAX_DEPTH + 1] == 0xff)
corrupt_dive = 1;
@ -765,8 +763,7 @@ static void cochran_parse_dive(const unsigned char *decode, unsigned mod,
* (double) log[EMC_ALTITUDE] * 250 * FEET, 5.25588) * 1000);
dc->salinity = 10000 + 150 * (log[EMC_WATER_CONDUCTIVITY] & 0x3);
SHA1(log + EMC_NUMBER, 2, (unsigned char *)csum);
dc->diveid = csum[0];
dc->diveid = SHA1_uint32(log + EMC_NUMBER, 2);
if (log[EMC_MAX_DEPTH] == 0xff && log[EMC_MAX_DEPTH + 1] == 0xff)
corrupt_dive = 1;

5
core/libdivecomputer.cpp
View file

@ -601,13 +601,10 @@ static char *str_printf(const char *fmt, ...)
*/
static uint32_t calculate_diveid(const unsigned char *fingerprint, unsigned int fsize)
{
uint32_t csum[5];
if (!fingerprint || !fsize)
return 0;
SHA1(fingerprint, fsize, (unsigned char *)csum);
return csum[0];
return SHA1_uint32(fingerprint, fsize);
}
uint32_t calculate_string_hash(const char *str)

12
core/sha1.c
View file

@ -298,3 +298,15 @@ void blk_SHA1_Final(unsigned char hashout[20], blk_SHA_CTX *ctx)
for (i = 0; i < 5; i++)
put_be32(hashout + i * 4, ctx->H[i]);
}
uint32_t SHA1_uint32(const void *dataIn, unsigned long len)
{
uint32_t hashout[5];
SHA_CTX ctx;
SHA1_Init(&ctx);
SHA1_Update(&ctx, dataIn, len);
SHA1_Final((unsigned char *)hashout, &ctx);
return hashout[0];
}

11
core/sha1.h
View file

@ -29,15 +29,8 @@ void blk_SHA1_Final(unsigned char hashout[20], blk_SHA_CTX *ctx);
#define SHA1_Update blk_SHA1_Update
#define SHA1_Final blk_SHA1_Final
/* Trivial helper function */
static inline void SHA1(const void *dataIn, unsigned long len, unsigned char hashout[20])
{
SHA_CTX ctx;
SHA1_Init(&ctx);
SHA1_Update(&ctx, dataIn, len);
SHA1_Final(hashout, &ctx);
}
/* Helper function that calculates an SHA1 has and returns the first 4 bytes as uint32_t */
uint32_t SHA1_uint32(const void *dataIn, unsigned long len);
#ifdef __cplusplus
}