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App now computes EIP-712 schema identifier

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This commit is contained in:
Alexandre Paillier
2022-06-29 14:51:37 +02:00
parent 5450f0c46f
commit 188a75ffff
2 changed files with 62 additions and 0 deletions
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1
src_features/signMessageEIP712/context.h
View File

@@ -12,6 +12,7 @@ typedef struct
uint8_t *structs_array;
uint8_t *current_struct_fields_array;
uint8_t contract_addr[ADDRESS_LENGTH];
uint8_t schema_hash[224 / 8];
} s_eip712_context;
extern s_eip712_context *eip712_context;

61
src_features/signMessageEIP712/entrypoint.c
View File

@@ -732,6 +732,66 @@ bool provide_field_name(const uint8_t *const payload, uint8_t length)
return ret;
}
#include "hash_bytes.h"
#include "format_hash_field_type.h"
bool compute_schema_hash(void)
{
const void *struct_ptr;
uint8_t structs_count;
const void *field_ptr;
uint8_t fields_count;
const char *name;
uint8_t name_length;
cx_sha256_t hash_ctx; // sha224
cx_sha224_init(&hash_ctx);
struct_ptr = get_structs_array(eip712_context->structs_array, &structs_count);
hash_byte('{', (cx_hash_t*)&hash_ctx);
while (structs_count-- > 0)
{
name = get_struct_name(struct_ptr, &name_length);
hash_byte('"', (cx_hash_t*)&hash_ctx);
hash_nbytes((uint8_t*)name, name_length, (cx_hash_t*)&hash_ctx);
hash_nbytes((uint8_t*)"\":[", 3, (cx_hash_t*)&hash_ctx);
field_ptr = get_struct_fields_array(struct_ptr, &fields_count);
while (fields_count-- > 0)
{
hash_nbytes((uint8_t*)"{\"name\":\"", 9, (cx_hash_t*)&hash_ctx);
name = get_struct_field_keyname(field_ptr, &name_length);
hash_nbytes((uint8_t*)name, name_length, (cx_hash_t*)&hash_ctx);
hash_nbytes((uint8_t*)"\",\"type\":\"", 10, (cx_hash_t*)&hash_ctx);
if (!format_hash_field_type(field_ptr, (cx_hash_t*)&hash_ctx))
{
return false;
}
hash_nbytes((uint8_t*)"\"}", 2, (cx_hash_t*)&hash_ctx);
if (fields_count > 0)
{
hash_byte(',', (cx_hash_t*)&hash_ctx);
}
field_ptr = get_next_struct_field(field_ptr);
}
hash_byte(']', (cx_hash_t*)&hash_ctx);
if (structs_count > 0)
{
hash_byte(',', (cx_hash_t*)&hash_ctx);
}
struct_ptr = get_next_struct(struct_ptr);
}
hash_byte('}', (cx_hash_t*)&hash_ctx);
// copy hash into context struct
cx_hash((cx_hash_t*)&hash_ctx,
CX_LAST,
NULL,
0,
eip712_context->schema_hash,
sizeof(eip712_context->schema_hash));
return true;
}
bool handle_eip712_filtering(const uint8_t *const apdu_buf)
{
bool ret = true;
@@ -743,6 +803,7 @@ bool handle_eip712_filtering(const uint8_t *const apdu_buf)
if (!N_storage.verbose_eip712)
{
ui_712_set_filtering_mode(EIP712_FILTERING_FULL);
ret = compute_schema_hash();
}
break;
case P1_CONTRACT_NAME: