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fix json string encoding

This commit is contained in:
Michele Balistreri 2024-06-24 13:19:03 +02:00
parent 57961a2bac
commit 6e9ab7f31b
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GPG Key ID: E9567DA33A4F791A
1 changed files with 47 additions and 1 deletions
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48
app/ethereum/eip712.c
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@ -372,7 +372,53 @@ static app_err_t eip712_encode_field(uint8_t out[32], uint8_t* heap, size_t heap
__DECL_SHA3_CTX();
keccak_Update(sha3, (uint8_t*) &ctx->json[ctx->tokens[field_val].start], ctx->tokens[field_val].end - ctx->tokens[field_val].start);
for (int i = ctx->tokens[field_val].start; i < ctx->tokens[field_val].end; i++) {
char c = ctx->json[i];
if (c == '\\') {
c = ctx->json[++i];
switch(c) {
case 'b':
c = '\b';
break;
case 'f':
c = '\f';
break;
case 'n':
c = '\n';
break;
case 'r':
c = '\r';
break;
case 't':
c = '\t';
break;
case 'u':
uint16_t codepoint;
base16_decode(&ctx->json[++i], (uint8_t*) &codepoint, 4);
i += 3;
codepoint = rev16(codepoint);
if (codepoint < 0x80) {
c = codepoint & 0x7f;
} else if (codepoint < 0x0800) {
c = 0xc0 | (codepoint >> 6);
keccak_Update(sha3, (uint8_t*) &c, 1);
c = 0x80 | (codepoint & 0x3f);
} else {
c = 0xe0 | (codepoint >> 12);
keccak_Update(sha3, (uint8_t*) &c, 1);
c = 0x80 | (codepoint >> 6);
keccak_Update(sha3, (uint8_t*) &c, 1);
c = 0x80 | (uint8_t) (codepoint & 0x3f);
}
break;
default:
break;
}
}
keccak_Update(sha3, (uint8_t*) &c, 1);
}
keccak_Final(sha3, out);
} else if (field_type->len == 5 && !strncmp(field_type->str, "bytes", 5)) {
if (ctx->tokens[field_val].type != JSMN_STRING) {