dearsky/pico-hsm
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Added length checks.

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Signed-off-by: Pol Henarejos <pol.henarejos@cttc.es>
This commit is contained in:
Pol Henarejos
2022-03-29 19:16:15 +02:00
parent 6876edea5a
commit e7d8695394
1 changed files with 5 additions and 3 deletions
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8
src/hsm/dkek.c
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@@ -122,7 +122,7 @@ int dkek_encode_key(void *key_ctx, int key_type, uint8_t *out, size_t *out_len)
if (!(key_type & HSM_KEY_RSA) && !(key_type & HSM_KEY_EC) && !(key_type & HSM_KEY_AES))
return HSM_WRONG_DATA;
uint8_t kb[2*4096/8+3+8+5]; //worst case: RSA-4096 (ECC is 596 max) (plus, 5 bytes padding)
uint8_t kb[8+2*4+2*4096/8+3+13]; //worst case: RSA-4096 (plus, 13 bytes padding)
memset(kb, 0, sizeof(kb));
int kb_len = 0;
uint8_t *algo = NULL;
@@ -152,7 +152,7 @@ int dkek_encode_key(void *key_ctx, int key_type, uint8_t *out, size_t *out_len)
if (kb_len != 16 && kb_len != 24 && kb_len != 32)
return HSM_WRONG_DATA;
if (*out_len < 8+1+10+6+4+48+16)
if (*out_len < 8+1+10+6+4+(2+32+14)+16)
return HSM_WRONG_LENGTH;
memcpy(kb+10, key_ctx, kb_len);
@@ -165,6 +165,8 @@ int dkek_encode_key(void *key_ctx, int key_type, uint8_t *out, size_t *out_len)
allowed_len = 6;
}
else if (key_type & HSM_KEY_RSA) {
if (*out_len < 8+1+12+6+(8+2*4+2*4096/8+3+13)+16) //13 bytes pading
return HSM_WRONG_LENGTH;
mbedtls_rsa_context *rsa = (mbedtls_rsa_context *)key_ctx;
kb_len = 0;
put_uint16_t(mbedtls_rsa_get_len(rsa)*8, kb+8+kb_len); kb_len += 2;
@@ -180,7 +182,7 @@ int dkek_encode_key(void *key_ctx, int key_type, uint8_t *out, size_t *out_len)
algo_len = 12;
}
else if (key_type & HSM_KEY_EC) {
if (*out_len < 8+1+10+6+4+48+16)
if (*out_len < 8+1+12+6+(8+2*8+9*66+2+4)+16) //4 bytes pading
return HSM_WRONG_LENGTH;
mbedtls_ecdsa_context *ecdsa = (mbedtls_ecdsa_context *)key_ctx;
kb_len = 0;