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krb5: Store a digest context in the crypto structure

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Creating and destroying an EVP_CTX_MD structure with every hash
operation is very expensive. Speed things up by caching one within
the krb5_crypto structure. krb5_crypto can already only be safely
used by one thread at a time - adding a message digest context here
shouldn't introduce any further threading risks.

Users of the stashed context must be careful to ensure that they
call no other hash functions whilst they are in the middle of using
the context.
This commit is contained in:
Simon Wilkinson
2018-05-14 14:21:28 +01:00
committed by Jeffrey Altman
parent fa1e998b53
commit e50faea7f0
12 changed files with 100 additions and 50 deletions
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20
lib/krb5/crypto.h
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@@ -42,13 +42,6 @@ struct _krb5_key_data {
struct _krb5_key_usage;
struct krb5_crypto_data {
struct _krb5_encryption_type *et;
struct _krb5_key_data key;
int num_key_usage;
struct _krb5_key_usage *key_usage;
};
#define CRYPTO_ETYPE(C) ((C)->et->type)
/* bits for `flags' below */
@@ -97,11 +90,13 @@ struct _krb5_checksum_type {
size_t checksumsize;
unsigned flags;
krb5_error_code (*checksum)(krb5_context context,
krb5_crypto crypto,
struct _krb5_key_data *key,
unsigned usage,
const struct krb5_crypto_iov *iov, int niov,
Checksum *csum);
krb5_error_code (*verify)(krb5_context context,
krb5_crypto crypto,
struct _krb5_key_data *key,
unsigned usage,
const struct krb5_crypto_iov *iov, int niov,
@@ -200,9 +195,18 @@ _krb5_crypto_iov_should_sign(const struct krb5_crypto_iov *iov)
struct _krb5_evp_schedule {
/*
* Normally we'd say EVP_CIPHER_CTX here, but! this header gets
* included in lib/krb5/pkinit-ec.ck
* included in lib/krb5/pkinit-ec.c
*/
EVP_CIPHER_CTX ectx;
EVP_CIPHER_CTX dctx;
};
struct krb5_crypto_data {
struct _krb5_encryption_type *et;
struct _krb5_key_data key;
EVP_MD_CTX *mdctx;
int num_key_usage;
struct _krb5_key_usage *key_usage;
};
#endif