77 lines
2.7 KiB
C
77 lines
2.7 KiB
C
#ifdef HAVE_EIP712_FULL_SUPPORT
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#include "schema_hash.h"
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#include "hash_bytes.h"
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#include "typed_data.h"
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#include "format_hash_field_type.h"
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#include "context_712.h"
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// the SDK does not define a SHA-224 type, define it here so it's easier
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// to understand in the code
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typedef cx_sha256_t cx_sha224_t;
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/**
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* Compute the schema hash
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*
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* The schema hash is the value of the root field "types" in the JSON data,
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* stripped of all its spaces and newlines. This function reconstructs the JSON syntax
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* from the stored typed data.
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*
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* @return whether the schema hash was successful or not
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*/
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bool compute_schema_hash(void) {
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const void *struct_ptr;
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uint8_t structs_count;
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const void *field_ptr;
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uint8_t fields_count;
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const char *name;
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uint8_t name_length;
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cx_sha224_t hash_ctx;
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cx_err_t error = CX_INTERNAL_ERROR;
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cx_sha224_init(&hash_ctx);
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struct_ptr = get_structs_array(&structs_count);
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hash_byte('{', (cx_hash_t *) &hash_ctx);
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while (structs_count-- > 0) {
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name = get_struct_name(struct_ptr, &name_length);
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hash_byte('"', (cx_hash_t *) &hash_ctx);
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hash_nbytes((uint8_t *) name, name_length, (cx_hash_t *) &hash_ctx);
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hash_nbytes((uint8_t *) "\":[", 3, (cx_hash_t *) &hash_ctx);
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field_ptr = get_struct_fields_array(struct_ptr, &fields_count);
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while (fields_count-- > 0) {
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hash_nbytes((uint8_t *) "{\"name\":\"", 9, (cx_hash_t *) &hash_ctx);
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name = get_struct_field_keyname(field_ptr, &name_length);
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hash_nbytes((uint8_t *) name, name_length, (cx_hash_t *) &hash_ctx);
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hash_nbytes((uint8_t *) "\",\"type\":\"", 10, (cx_hash_t *) &hash_ctx);
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if (!format_hash_field_type(field_ptr, (cx_hash_t *) &hash_ctx)) {
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return false;
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}
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hash_nbytes((uint8_t *) "\"}", 2, (cx_hash_t *) &hash_ctx);
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if (fields_count > 0) {
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hash_byte(',', (cx_hash_t *) &hash_ctx);
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}
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field_ptr = get_next_struct_field(field_ptr);
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}
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hash_byte(']', (cx_hash_t *) &hash_ctx);
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if (structs_count > 0) {
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hash_byte(',', (cx_hash_t *) &hash_ctx);
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}
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struct_ptr = get_next_struct(struct_ptr);
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}
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hash_byte('}', (cx_hash_t *) &hash_ctx);
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// copy hash into context struct
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CX_CHECK(cx_hash_no_throw((cx_hash_t *) &hash_ctx,
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CX_LAST,
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NULL,
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0,
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eip712_context->schema_hash,
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sizeof(eip712_context->schema_hash)));
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return true;
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end:
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return false;
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}
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#endif // HAVE_EIP712_FULL_SUPPORT
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