107 lines
3.8 KiB
Diff
107 lines
3.8 KiB
Diff
From 5ed0331bd6bfd39b9c5ca40ec38d536221118998 Mon Sep 17 00:00:00 2001
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From: Greg Hudson <ghudson@mit.edu>
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Date: Sat, 3 Feb 2018 20:53:42 -0500
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Subject: [PATCH] Add vector support to k5_sha256()
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Add a length argument so that multiple krb5_data values can be passed
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to k5_sha256(), for efficient computation of SHA-256 hashes over
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concatenations of data values.
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(cherry picked from commit 4f3373e8c55b3e9bdfb5b065e07214c5816c85fa)
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---
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src/include/k5-int.h | 4 ++--
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src/lib/crypto/builtin/sha2/sha256.c | 6 ++++--
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src/lib/crypto/crypto_tests/t_sha2.c | 2 +-
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src/lib/crypto/openssl/sha256.c | 6 ++++--
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src/lib/krb5/rcache/rc_conv.c | 2 +-
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5 files changed, 12 insertions(+), 8 deletions(-)
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diff --git a/src/include/k5-int.h b/src/include/k5-int.h
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index 9378ae047..1c1d9783b 100644
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--- a/src/include/k5-int.h
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+++ b/src/include/k5-int.h
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@@ -635,9 +635,9 @@ krb5int_arcfour_gsscrypt(const krb5_keyblock *keyblock, krb5_keyusage usage,
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#define K5_SHA256_HASHLEN (256 / 8)
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-/* Write the SHA-256 hash of in to out. */
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+/* Write the SHA-256 hash of in (containing n elements) to out. */
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krb5_error_code
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-k5_sha256(const krb5_data *in, uint8_t out[K5_SHA256_HASHLEN]);
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+k5_sha256(const krb5_data *in, size_t n, uint8_t out[K5_SHA256_HASHLEN]);
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/*
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* Attempt to zero memory in a way that compilers won't optimize out.
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diff --git a/src/lib/crypto/builtin/sha2/sha256.c b/src/lib/crypto/builtin/sha2/sha256.c
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index 2b5cbe480..9a940b3f8 100644
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--- a/src/lib/crypto/builtin/sha2/sha256.c
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+++ b/src/lib/crypto/builtin/sha2/sha256.c
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@@ -257,12 +257,14 @@ k5_sha256_final(void *res, SHA256_CTX *m)
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}
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krb5_error_code
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-k5_sha256(const krb5_data *in, uint8_t out[K5_SHA256_HASHLEN])
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+k5_sha256(const krb5_data *in, size_t n, uint8_t out[K5_SHA256_HASHLEN])
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{
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SHA256_CTX ctx;
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+ size_t i;
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k5_sha256_init(&ctx);
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- k5_sha256_update(&ctx, in->data, in->length);
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+ for (i = 0; i < n; i++)
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+ k5_sha256_update(&ctx, in[i].data, in[i].length);
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k5_sha256_final(out, &ctx);
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return 0;
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}
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diff --git a/src/lib/crypto/crypto_tests/t_sha2.c b/src/lib/crypto/crypto_tests/t_sha2.c
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index 12f32869b..e6fa58498 100644
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--- a/src/lib/crypto/crypto_tests/t_sha2.c
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+++ b/src/lib/crypto/crypto_tests/t_sha2.c
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@@ -125,7 +125,7 @@ hash_test(const struct krb5_hash_provider *hash, struct test *tests)
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if (hash == &krb5int_hash_sha256) {
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/* Try again using k5_sha256(). */
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- if (k5_sha256(&iov.data, (uint8_t *)hval.data) != 0)
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+ if (k5_sha256(&iov.data, 1, (uint8_t *)hval.data) != 0)
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abort();
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if (memcmp(hval.data, t->hash, hval.length) != 0)
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abort();
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diff --git a/src/lib/crypto/openssl/sha256.c b/src/lib/crypto/openssl/sha256.c
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index fa095d472..0edd8b7ba 100644
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--- a/src/lib/crypto/openssl/sha256.c
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+++ b/src/lib/crypto/openssl/sha256.c
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@@ -34,16 +34,18 @@
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#include <openssl/evp.h>
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krb5_error_code
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-k5_sha256(const krb5_data *in, uint8_t out[K5_SHA256_HASHLEN])
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+k5_sha256(const krb5_data *in, size_t n, uint8_t out[K5_SHA256_HASHLEN])
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{
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EVP_MD_CTX *ctx;
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+ size_t i;
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int ok;
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ctx = EVP_MD_CTX_new();
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if (ctx == NULL)
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return ENOMEM;
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ok = EVP_DigestInit_ex(ctx, EVP_sha256(), NULL);
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- ok = ok && EVP_DigestUpdate(ctx, in->data, in->length);
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+ for (i = 0; i < n; i++)
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+ ok = ok && EVP_DigestUpdate(ctx, in[i].data, in[i].length);
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ok = ok && EVP_DigestFinal_ex(ctx, out, NULL);
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EVP_MD_CTX_free(ctx);
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return ok ? 0 : ENOMEM;
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diff --git a/src/lib/krb5/rcache/rc_conv.c b/src/lib/krb5/rcache/rc_conv.c
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index 0e021f5d8..f2fe528ac 100644
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--- a/src/lib/krb5/rcache/rc_conv.c
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+++ b/src/lib/krb5/rcache/rc_conv.c
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@@ -58,7 +58,7 @@ krb5_rc_hash_message(krb5_context context, const krb5_data *message,
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*out = NULL;
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/* Calculate the binary checksum. */
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- retval = k5_sha256(message, cksum);
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+ retval = k5_sha256(message, 1, cksum);
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if (retval)
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return retval;
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