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Allow CTR mode counter to be set to a specific value.

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This commit is contained in:
Guus Sliepen 2012-03-18 16:41:13 +01:00
parent 40c2858932
commit 03e06fd43a
2 changed files with 14 additions and 0 deletions
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13
src/openssl/cipher.c
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@ -105,6 +105,19 @@ bool cipher_set_key_from_rsa(cipher_t *cipher, void *key, size_t len, bool encry
return false;
}
bool cipher_set_counter(cipher_t *cipher, const void *counter, size_t len) {
if(len > cipher->cipher->block_size - 4) {
logger(DEBUG_ALWAYS, LOG_ERR, "Counter too long");
abort();
}
memcpy(cipher->counter->counter + cipher->cipher->block_size - len, counter, len);
memset(cipher->counter->counter, 0, 4);
cipher->counter->n = 0;
return true;
}
bool cipher_set_counter_key(cipher_t *cipher, void *key) {
int result = EVP_EncryptInit_ex(&cipher->ctx, cipher->cipher, NULL, (unsigned char *)key, NULL);
if(!result) {

1
src/openssl/cipher.h
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@ -39,6 +39,7 @@ extern void cipher_close(cipher_t *);
extern size_t cipher_keylength(const cipher_t *);
extern bool cipher_set_key(cipher_t *, void *, bool);
extern bool cipher_set_key_from_rsa(cipher_t *, void *, size_t, bool);
extern bool cipher_set_counter(cipher_t *, const void *, size_t);
extern bool cipher_set_counter_key(cipher_t *, void *);
extern bool cipher_encrypt(cipher_t *, const void *indata, size_t inlen, void *outdata, size_t *outlen, bool);
extern bool cipher_decrypt(cipher_t *, const void *indata, size_t inlen, void *outdata, size_t *outlen, bool);