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Stop hashing the null byte

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Change the hash data to not include the null byte used to terminate
the string. Pass sizeof() - 1 to the hash operation API functions
so that the null byte can be ignored.

Signed-off-by: Thomas Daubney <thomas.daubney@arm.com>
This commit is contained in:
Thomas Daubney 2023-07-28 17:15:03 +01:00
parent fbe742b2d0
commit c918c32cc0
1 changed files with 8 additions and 6 deletions
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14
programs/psa/psa_hash.c
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@ -41,10 +41,10 @@
#define HASH_ALG PSA_ALG_SHA_256
#define SAMPLE_HASH_DATA { \
0x5a, 0x09, 0xe8, 0xfa, 0x9c, 0x77, 0x80, 0x7b, 0x24, 0xe9, 0x9c, 0x9c, \
0xf9, 0x99, 0xde, 0xbf, 0xad, 0x84, 0x41, 0xe2, 0x69, 0xeb, 0x96, 0x0e, \
0x20, 0x1f, 0x61, 0xfc, 0x3d, 0xe2, 0x0d, 0x5a \
#define SAMPLE_HASH_DATA { \
0x7f, 0x83, 0xb1, 0x65, 0x7f, 0xf1, 0xfc, 0x53, 0xb9, 0x2d, 0xc1, 0x81, \
0x48, 0xa1, 0xd6, 0x5d, 0xfc, 0x2d, 0x4b, 0x1f, 0xa3, 0xd6, 0x77, 0x28, \
0x4a, 0xdd, 0xd2, 0x00, 0x12, 0x6d, 0x90, 0x69 \
}
const uint8_t sample_message[] = "Hello World!";
@ -87,7 +87,9 @@ int main(void)
return EXIT_FAILURE;
}
status = psa_hash_update(&hash_operation, sample_message, sizeof(sample_message));
/* Note: Here we use sizeof(sample_message) - 1 since we don't wish to
* include the null byte in the hash computation */
status = psa_hash_update(&hash_operation, sample_message, sizeof(sample_message) - 1);
if (status != PSA_SUCCESS) {
mbedtls_printf("psa_hash_update failed\n");
psa_hash_abort(&hash_operation);
@ -138,7 +140,7 @@ int main(void)
/* Compute hash using one-shot function call */
status = psa_hash_compute(HASH_ALG,
sample_message, sizeof(sample_message),
sample_message, sizeof(sample_message) - 1,
hash, sizeof(hash),
&hash_length);
if (status != PSA_SUCCESS) {