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Implement ANSI X9.63 sha256 per spec

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Grayson Martin 2023-07-07 14:37:02 -05:00
commit 610b8a7410
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GPG key ID: 4914C62F2696A273
2 changed files with 36 additions and 0 deletions
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33
client/src/crypto/libpcrypto.c
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@ -18,6 +18,7 @@
#include "crypto/libpcrypto.h"
#include "crypto/asn1utils.h"
#include <stdint.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
@ -34,6 +35,7 @@
#include <mbedtls/entropy.h>
#include <mbedtls/error.h>
#include <mbedtls/blowfish.h>
#include "libpcrypto.h"
#include "util.h"
#include "ui.h"
@ -632,3 +634,34 @@ int blowfish_decrypt(uint8_t *iv, uint8_t *key, uint8_t *input, uint8_t *output,
return 0;
}
// Implementation from http://www.secg.org/sec1-v2.pdf#subsubsection.3.6.1
int ansi_x963_sha256(uint8_t *sharedSecret, size_t sharedSecretLen, uint8_t *sharedInfo, size_t sharedInfoLen, size_t keyDataLen, uint8_t *keyData) {
// sha256 hash has (practically) no max input len, so skipping that step
if (keyDataLen >= 32 * (pow(2, 32) - 1)) {
return 1;
}
uint32_t counter = 0x00000001;
for (int i = 0; i < (keyDataLen / 32); ++i) {
uint8_t *hashMaterial = malloc(4 + sharedSecretLen + sharedInfoLen);
memcpy(hashMaterial, sharedSecret, sharedSecretLen);
hashMaterial[sharedSecretLen] = (counter >> 24);
hashMaterial[sharedSecretLen + 1] = (counter >> 16) & 0xFF;
hashMaterial[sharedSecretLen + 2] = (counter >> 8) & 0xFF;
hashMaterial[sharedSecretLen + 3] = counter & 0xFF;
memcpy(hashMaterial + sharedSecretLen + 4, sharedInfo, sharedInfoLen);
uint8_t hash[32] = {0};
sha256hash(hashMaterial, 4 + sharedSecretLen + sharedInfoLen, hash);
free(hashMaterial);
memcpy(keyData + (32 * i), hash, 32);
counter++;
}
return 0;
}

3
client/src/crypto/libpcrypto.h
View file

@ -64,4 +64,7 @@ size_t FindISO9797M2PaddingDataLen(const uint8_t *data, size_t datalen);
// BLOWFISH
int blowfish_decrypt(uint8_t *iv, uint8_t *key, uint8_t *input, uint8_t *output, int length);
// KDF
int ansi_x963_sha256(uint8_t *sharedSecret, size_t sharedSecretLen, uint8_t *sharedInfo, size_t sharedInfoLen, size_t keyDataLen, uint8_t *keyData);
#endif /* libpcrypto.h */