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Allocate the temporary buffer in tls1_PRF internally.

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It's not worth saving the extra mallocs. This is preparation for moving SSLv3
to stateful AEADs; it'll share code TLS's SSL3_ENC_METHOD, but
tls1_generate_key_block is different, so that'll be pulled out into its own
hook.

Change-Id: I3f2136600758465c66ce23736041bb47f74efa6d
Reviewed-on: https://boringssl-review.googlesource.com/2690
Reviewed-by: Adam Langley <agl@google.com>
This commit is contained in:
David Benjamin 2014-12-22 10:42:51 -05:00 committed by Adam Langley
parent 2bca0988a4
commit af032d68b3
1 changed files with 40 additions and 43 deletions
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83
ssl/t1_enc.c
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@ -229,12 +229,24 @@ static int tls1_PRF(long digest_mask,
const void *seed2, int seed2_len,
const void *seed3, int seed3_len,
const uint8_t *sec, int slen,
uint8_t *out1, uint8_t *out2, int olen) {
uint8_t *out, int olen) {
int len, i, idx, count;
const uint8_t *S1;
long m;
const EVP_MD *md;
int ret = 0;
uint8_t *tmp;
if (olen <= 0) {
return 1;
}
/* Allocate a temporary buffer. */
tmp = OPENSSL_malloc(olen);
if (tmp == NULL) {
OPENSSL_PUT_ERROR(SSL, tls1_PRF, ERR_R_MALLOC_FAILURE);
return 0;
}
/* Count number of digests and partition sec evenly */
count = 0;
@ -248,7 +260,7 @@ static int tls1_PRF(long digest_mask,
slen = 0;
}
S1 = sec;
memset(out1, 0, olen);
memset(out, 0, olen);
for (idx = 0; ssl_get_handshake_digest(idx, &m, &md); idx++) {
if ((m << TLS1_PRF_DGST_SHIFT) & digest_mask) {
if (!md) {
@ -256,27 +268,29 @@ static int tls1_PRF(long digest_mask,
goto err;
}
if (!tls1_P_hash(md, S1, len + (slen & 1), seed1, seed1_len, seed2,
seed2_len, seed3, seed3_len, out2, olen)) {
seed2_len, seed3, seed3_len, tmp, olen)) {
goto err;
}
S1 += len;
for (i = 0; i < olen; i++) {
out1[i] ^= out2[i];
out[i] ^= tmp[i];
}
}
}
ret = 1;
err:
OPENSSL_cleanse(tmp, olen);
OPENSSL_free(tmp);
return ret;
}
static int tls1_generate_key_block(SSL *s, uint8_t *km, uint8_t *tmp, int num) {
static int tls1_generate_key_block(SSL *s, uint8_t *km, int num) {
return tls1_PRF(ssl_get_algorithm2(s), TLS_MD_KEY_EXPANSION_CONST,
TLS_MD_KEY_EXPANSION_CONST_SIZE, s->s3->server_random,
SSL3_RANDOM_SIZE, s->s3->client_random, SSL3_RANDOM_SIZE,
s->session->master_key, s->session->master_key_length, km,
tmp, num);
num);
}
/* tls1_aead_ctx_init allocates |*aead_ctx|, if needed and returns 1. It
@ -582,7 +596,7 @@ int tls1_change_cipher_state(SSL *s, int which) {
}
int tls1_setup_key_block(SSL *s) {
uint8_t *p1, *p2 = NULL;
uint8_t *p;
const EVP_CIPHER *c = NULL;
const EVP_MD *hash = NULL;
const EVP_AEAD *aead = NULL;
@ -638,22 +652,16 @@ int tls1_setup_key_block(SSL *s) {
ssl3_cleanup_key_block(s);
p1 = (uint8_t *)OPENSSL_malloc(num);
if (p1 == NULL) {
p = (uint8_t *)OPENSSL_malloc(num);
if (p == NULL) {
OPENSSL_PUT_ERROR(SSL, tls1_setup_key_block, ERR_R_MALLOC_FAILURE);
goto err;
}
s->s3->tmp.key_block_length = num;
s->s3->tmp.key_block = p1;
s->s3->tmp.key_block = p;
p2 = (uint8_t *)OPENSSL_malloc(num);
if (p2 == NULL) {
OPENSSL_PUT_ERROR(SSL, tls1_setup_key_block, ERR_R_MALLOC_FAILURE);
goto err;
}
if (!tls1_generate_key_block(s, p1, p2, num)) {
if (!tls1_generate_key_block(s, p, num)) {
goto err;
}
@ -672,10 +680,6 @@ int tls1_setup_key_block(SSL *s) {
ret = 1;
err:
if (p2) {
OPENSSL_cleanse(p2, num);
OPENSSL_free(p2);
}
return ret;
cipher_unavailable_err:
@ -983,7 +987,6 @@ int tls1_handshake_digest(SSL *s, uint8_t *out, size_t out_len) {
int tls1_final_finish_mac(SSL *s, const char *str, int slen, uint8_t *out) {
uint8_t buf[2 * EVP_MAX_MD_SIZE];
uint8_t buf2[12];
int err = 0;
int digests_len;
@ -1000,14 +1003,14 @@ int tls1_final_finish_mac(SSL *s, const char *str, int slen, uint8_t *out) {
if (!tls1_PRF(ssl_get_algorithm2(s), str, slen, buf, digests_len, NULL, 0,
s->session->master_key, s->session->master_key_length, out,
buf2, sizeof buf2)) {
12)) {
err = 1;
}
if (err) {
return 0;
} else {
return sizeof(buf2);
return 12;
}
}
@ -1095,8 +1098,6 @@ int tls1_mac(SSL *ssl, uint8_t *md, int send) {
}
int tls1_generate_master_secret(SSL *s, uint8_t *out, uint8_t *p, int len) {
uint8_t buff[SSL_MAX_MASTER_KEY_LENGTH];
if (s->s3->tmp.extended_master_secret) {
uint8_t digests[2 * EVP_MAX_MD_SIZE];
int digests_len;
@ -1119,14 +1120,19 @@ int tls1_generate_master_secret(SSL *s, uint8_t *out, uint8_t *p, int len) {
return 0;
}
tls1_PRF(ssl_get_algorithm2(s), TLS_MD_EXTENDED_MASTER_SECRET_CONST,
TLS_MD_EXTENDED_MASTER_SECRET_CONST_SIZE, digests, digests_len,
NULL, 0, p, len, s->session->master_key, buff, sizeof(buff));
if (!tls1_PRF(ssl_get_algorithm2(s), TLS_MD_EXTENDED_MASTER_SECRET_CONST,
TLS_MD_EXTENDED_MASTER_SECRET_CONST_SIZE, digests,
digests_len, NULL, 0, p, len, s->session->master_key,
SSL_MAX_MASTER_KEY_LENGTH)) {
return 0;
}
} else {
tls1_PRF(ssl_get_algorithm2(s), TLS_MD_MASTER_SECRET_CONST,
TLS_MD_MASTER_SECRET_CONST_SIZE, s->s3->client_random,
SSL3_RANDOM_SIZE, s->s3->server_random, SSL3_RANDOM_SIZE, p, len,
s->session->master_key, buff, sizeof buff);
if (!tls1_PRF(ssl_get_algorithm2(s), TLS_MD_MASTER_SECRET_CONST,
TLS_MD_MASTER_SECRET_CONST_SIZE, s->s3->client_random,
SSL3_RANDOM_SIZE, s->s3->server_random, SSL3_RANDOM_SIZE, p,
len, s->session->master_key, SSL_MAX_MASTER_KEY_LENGTH)) {
return 0;
}
}
return SSL3_MASTER_SECRET_SIZE;
@ -1136,16 +1142,10 @@ int tls1_export_keying_material(SSL *s, uint8_t *out, size_t olen,
const char *label, size_t llen,
const uint8_t *context, size_t contextlen,
int use_context) {
uint8_t *buff;
uint8_t *val = NULL;
size_t vallen, currentvalpos;
int ret;
buff = OPENSSL_malloc(olen);
if (buff == NULL) {
goto err2;
}
/* construct PRF arguments we construct the PRF argument ourself rather than
* passing separate values into the TLS PRF to ensure that the concatenation
* of values does not create a prohibited label. */
@ -1193,7 +1193,7 @@ int tls1_export_keying_material(SSL *s, uint8_t *out, size_t olen,
ret = tls1_PRF(ssl_get_algorithm2(s), val, vallen, NULL, 0, NULL, 0,
s->session->master_key, s->session->master_key_length, out,
buff, olen);
olen);
goto out;
@ -1208,9 +1208,6 @@ err2:
ret = 0;
out:
if (buff != NULL) {
OPENSSL_free(buff);
}
if (val != NULL) {
OPENSSL_free(val);
}