[thirdparty/openssl.git] / ssl / tls13_enc.c

/*
 * Copyright 2016 The OpenSSL Project Authors. All Rights Reserved.
 *
 * Licensed under the OpenSSL license (the "License").  You may not use
 * this file except in compliance with the License.  You can obtain a copy
 * in the file LICENSE in the source distribution or at
 * https://www.openssl.org/source/license.html
 */

#include <stdlib.h>
#include "ssl_locl.h"
#include <openssl/evp.h>
#include <openssl/kdf.h>

#define TLS13_MAX_LABEL_LEN     246

/* Always filled with zeros */
static const unsigned char default_zeros[EVP_MAX_MD_SIZE];

/*
 * Given a |secret|; a |label| of length |labellen|; and a |hash| of the
 * handshake messages, derive a new secret |outlen| bytes long and store it in
 * the location pointed to be |out|. The |hash| value may be NULL. Returns 1 on
 * success  0 on failure.
 */
static int tls13_hkdf_expand(SSL *s, const unsigned char *secret,
                             const unsigned char *label, size_t labellen,
                             const unsigned char *hash,
                             unsigned char *out, size_t outlen)
{
    const unsigned char label_prefix[] = "TLS 1.3, ";
    const EVP_MD *md = ssl_handshake_md(s);
    EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new_id(EVP_PKEY_HKDF, NULL);
    int ret;
    size_t hkdflabellen;
    size_t hashlen;
    /*
     * 2 bytes for length of whole HkdfLabel + 1 byte for length of combined
     * prefix and label + bytes for the label itself + bytes for the hash
     */
    unsigned char hkdflabel[sizeof(uint16_t) + sizeof(uint8_t) +
                            + sizeof(label_prefix) + TLS13_MAX_LABEL_LEN
                            + EVP_MAX_MD_SIZE];
    WPACKET pkt;

    if (pctx == NULL)
        return 0;

    hashlen = EVP_MD_size(md);

    if (!WPACKET_init_static_len(&pkt, hkdflabel, sizeof(hkdflabel), 0)
            || !WPACKET_put_bytes_u16(&pkt, outlen)
            || !WPACKET_start_sub_packet_u8(&pkt)
            || !WPACKET_memcpy(&pkt, label_prefix, sizeof(label_prefix) - 1)
            || !WPACKET_memcpy(&pkt, label, labellen)
            || !WPACKET_close(&pkt)
            || !WPACKET_sub_memcpy_u8(&pkt, hash, (hash == NULL) ? 0 : hashlen)
            || !WPACKET_get_total_written(&pkt, &hkdflabellen)
            || !WPACKET_finish(&pkt)) {
        WPACKET_cleanup(&pkt);
        return 0;
    }

    ret = EVP_PKEY_derive_init(pctx) <= 0
            || EVP_PKEY_CTX_hkdf_mode(pctx, EVP_PKEY_HKDEF_MODE_EXPAND_ONLY)
               <= 0
            || EVP_PKEY_CTX_set_hkdf_md(pctx, md) <= 0
            || EVP_PKEY_CTX_set1_hkdf_key(pctx, secret, hashlen) <= 0
            || EVP_PKEY_CTX_add1_hkdf_info(pctx, hkdflabel, hkdflabellen) <= 0
            || EVP_PKEY_derive(pctx, out, &outlen) <= 0;

    EVP_PKEY_CTX_free(pctx);

    return ret == 0;
}

/*
 * Given a input secret |insecret| and a |label| of length |labellen|, derive a
 * new |secret|. This will be the length of the current hash output size and
 * will be based on the current state of the handshake hashes. Returns 1 on
 * success  0 on failure.
 */
int tls13_derive_secret(SSL *s, const unsigned char *insecret,
                        const unsigned char *label, size_t labellen,
                        unsigned char *secret)
{
    unsigned char hash[EVP_MAX_MD_SIZE];
    size_t hashlen;

    if (!ssl3_digest_cached_records(s, 1))
        return 0;

    if (!ssl_handshake_hash(s, hash, sizeof(hash), &hashlen))
        return 0;

    return tls13_hkdf_expand(s, insecret, label, labellen, hash, secret,
                             hashlen);
}

/*
 * Given a |secret| generate a |key| of length |keylen| bytes. Returns 1 on
 * success  0 on failure.
 */
int tls13_derive_key(SSL *s, const unsigned char *secret, unsigned char *key,
                     size_t keylen)
{
    static const unsigned char keylabel[] = "key";

    return tls13_hkdf_expand(s, secret, keylabel, sizeof(keylabel) - 1, NULL,
                             key, keylen);
}

/*
 * Given a |secret| generate an |iv| of length |ivlen| bytes. Returns 1 on
 * success  0 on failure.
 */
int tls13_derive_iv(SSL *s, const unsigned char *secret, unsigned char *iv,
                    size_t ivlen)
{
    static const unsigned char ivlabel[] = "iv";

    return tls13_hkdf_expand(s, secret, ivlabel, sizeof(ivlabel) - 1, NULL,
                             iv, ivlen);
}

static int tls13_derive_finishedkey(SSL *s, const unsigned char *secret,
                                 unsigned char *fin, size_t finlen)
{
    static const unsigned char finishedlabel[] = "finished";

    return tls13_hkdf_expand(s, secret, finishedlabel,
                             sizeof(finishedlabel) - 1, NULL, fin, finlen);
}

/*
 * Given the previous secret |prevsecret| and a new input secret |insecret| of
 * length |insecretlen|, generate a new secret and store it in the location
 * pointed to by |outsecret|. Returns 1 on success  0 on failure.
 */
static int tls13_generate_secret(SSL *s, const unsigned char *prevsecret,
                                 const unsigned char *insecret,
                                 size_t insecretlen,
                                 unsigned char *outsecret)
{
    const EVP_MD *md = ssl_handshake_md(s);
    size_t mdlen, prevsecretlen;
    int ret;
    EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new_id(EVP_PKEY_HKDF, NULL);

    if (pctx == NULL)
        return 0;

    mdlen = EVP_MD_size(md);

    if (insecret == NULL) {
        insecret = default_zeros;
        insecretlen = mdlen;
    }
    if (prevsecret == NULL) {
        prevsecret = default_zeros;
        prevsecretlen = 0;
    } else {
        prevsecretlen = mdlen;
    }

    ret = EVP_PKEY_derive_init(pctx) <= 0
            || EVP_PKEY_CTX_hkdf_mode(pctx, EVP_PKEY_HKDEF_MODE_EXTRACT_ONLY)
               <= 0
            || EVP_PKEY_CTX_set_hkdf_md(pctx, md) <= 0
            || EVP_PKEY_CTX_set1_hkdf_key(pctx, insecret, insecretlen) <= 0
            || EVP_PKEY_CTX_set1_hkdf_salt(pctx, prevsecret, prevsecretlen)
               <= 0
            || EVP_PKEY_derive(pctx, outsecret, &mdlen)
               <= 0;

    EVP_PKEY_CTX_free(pctx);
    return ret == 0;
}

/*
 * Given an input secret |insecret| of length |insecretlen| generate the early
 * secret. Returns 1 on success  0 on failure.
 */
int tls13_generate_early_secret(SSL *s, const unsigned char *insecret,
                                size_t insecretlen)
{
    return tls13_generate_secret(s, NULL, insecret, insecretlen,
                                 (unsigned char *)&s->early_secret);
}

/*
 * Given an input secret |insecret| of length |insecretlen| generate the
 * handshake secret. This requires the early secret to already have been
 * generated. Returns 1 on success  0 on failure.
 */
int tls13_generate_handshake_secret(SSL *s, const unsigned char *insecret,
                                size_t insecretlen)
{
    return tls13_generate_secret(s, s->early_secret, insecret, insecretlen,
                                 (unsigned char *)&s->handshake_secret);
}

/*
 * Given the handshake secret |prev| of length |prevlen| generate the master
 * secret and store its length in |*secret_size|. Returns 1 on success  0 on
 * failure.
 */
int tls13_generate_master_secret(SSL *s, unsigned char *out,
                                 unsigned char *prev, size_t prevlen,
                                 size_t *secret_size)
{
    *secret_size = EVP_MD_size(ssl_handshake_md(s));
    return tls13_generate_secret(s, prev, NULL, 0, out);
}

/*
 * Generates the mac for the Finished message. Returns the length of the MAC or
 * 0 on error.
 */
size_t tls13_final_finish_mac(SSL *s, const char *str, size_t slen,
                             unsigned char *out)
{
    const EVP_MD *md = ssl_handshake_md(s);
    unsigned char hash[EVP_MAX_MD_SIZE];
    size_t hashlen, ret = 0;
    EVP_PKEY *key = NULL;
    EVP_MD_CTX *ctx = EVP_MD_CTX_new();

    if (!ssl_handshake_hash(s, hash, sizeof(hash), &hashlen))
        goto err;

    if (str == s->method->ssl3_enc->server_finished_label)
        key = EVP_PKEY_new_mac_key(EVP_PKEY_HMAC, NULL,
                                   s->server_finished_secret, hashlen);
    else
        key = EVP_PKEY_new_mac_key(EVP_PKEY_HMAC, NULL,
                                   s->client_finished_secret, hashlen);

    if (key == NULL
            || ctx == NULL
            || EVP_DigestSignInit(ctx, NULL, md, NULL, key) <= 0
            || EVP_DigestSignUpdate(ctx, hash, hashlen) <= 0
            || EVP_DigestSignFinal(ctx, out, &hashlen) <= 0)
        goto err;

    ret = hashlen;
 err:
    EVP_PKEY_free(key);
    EVP_MD_CTX_free(ctx);
    return ret;
}

/*
 * There isn't really a key block in TLSv1.3, but we still need this function
 * for initialising the cipher and hash. Returns 1 on success or 0 on failure.
 */
int tls13_setup_key_block(SSL *s)
{
    const EVP_CIPHER *c;
    const EVP_MD *hash;
    int mac_type = NID_undef;

    s->session->cipher = s->s3->tmp.new_cipher;
    if (!ssl_cipher_get_evp
        (s->session, &c, &hash, &mac_type, NULL, NULL, 0)) {
        SSLerr(SSL_F_TLS13_SETUP_KEY_BLOCK, SSL_R_CIPHER_OR_HASH_UNAVAILABLE);
        return 0;
    }

    s->s3->tmp.new_sym_enc = c;
    s->s3->tmp.new_hash = hash;

    return 1;
}

int tls13_change_cipher_state(SSL *s, int which)
{
    static const unsigned char client_handshake_traffic[] =
        "client handshake traffic secret";
    static const unsigned char client_application_traffic[] =
        "client application traffic secret";
    static const unsigned char server_handshake_traffic[] =
        "server handshake traffic secret";
    static const unsigned char server_application_traffic[] =
        "server application traffic secret";
    unsigned char key[EVP_MAX_KEY_LENGTH];
    unsigned char *iv;
    unsigned char secret[EVP_MAX_MD_SIZE];
    unsigned char *insecret;
    unsigned char *finsecret = NULL;
    EVP_CIPHER_CTX *ciph_ctx;
    const EVP_CIPHER *ciph = s->s3->tmp.new_sym_enc;
    size_t ivlen, keylen, finsecretlen = 0;
    const unsigned char *label;
    size_t labellen;
    int ret = 0;

    if (which & SSL3_CC_READ) {
        if (s->enc_read_ctx != NULL) {
            EVP_CIPHER_CTX_reset(s->enc_read_ctx);
        } else {
            s->enc_read_ctx = EVP_CIPHER_CTX_new();
            if (s->enc_read_ctx == NULL) {
                SSLerr(SSL_F_TLS13_CHANGE_CIPHER_STATE, ERR_R_MALLOC_FAILURE);
                goto err;
            }
        }
        ciph_ctx = s->enc_read_ctx;
        iv = s->read_iv;

        RECORD_LAYER_reset_read_sequence(&s->rlayer);
    } else {
        if (s->enc_write_ctx != NULL) {
            EVP_CIPHER_CTX_reset(s->enc_write_ctx);
        } else {
            s->enc_write_ctx = EVP_CIPHER_CTX_new();
            if (s->enc_write_ctx == NULL) {
                SSLerr(SSL_F_TLS13_CHANGE_CIPHER_STATE, ERR_R_MALLOC_FAILURE);
                goto err;
            }
        }
        ciph_ctx = s->enc_write_ctx;
        iv = s->write_iv;

        RECORD_LAYER_reset_write_sequence(&s->rlayer);
    }

    if (((which & SSL3_CC_CLIENT) && (which & SSL3_CC_WRITE))
            || ((which & SSL3_CC_SERVER) && (which & SSL3_CC_READ))) {
        if (which & SSL3_CC_HANDSHAKE) {
            insecret = s->handshake_secret;
            finsecret = s->client_finished_secret;
            finsecretlen = sizeof(s->client_finished_secret);
            label = client_handshake_traffic;
            labellen = sizeof(client_handshake_traffic) - 1;
        } else {
            insecret = s->session->master_key;
            label = client_application_traffic;
            labellen = sizeof(client_application_traffic) - 1;
        }
    } else {
        if (which & SSL3_CC_HANDSHAKE) {
            insecret = s->handshake_secret;
            finsecret = s->server_finished_secret;
            finsecretlen = sizeof(s->server_finished_secret);
            label = server_handshake_traffic;
            labellen = sizeof(server_handshake_traffic) - 1;
        } else {
            insecret = s->session->master_key;
            label = server_application_traffic;
            labellen = sizeof(server_application_traffic) - 1;
        }
    }

    if (!tls13_derive_secret(s, insecret, label, labellen, secret)) {
        SSLerr(SSL_F_TLS13_CHANGE_CIPHER_STATE, ERR_R_INTERNAL_ERROR);
        goto err;
    }

    /* TODO(size_t): convert me */
    keylen = EVP_CIPHER_key_length(ciph);
    ivlen = EVP_CIPHER_iv_length(ciph);

    if (!tls13_derive_key(s, secret, key, keylen)
            || !tls13_derive_iv(s, secret, iv, ivlen)
            || (finsecret != NULL && !tls13_derive_finishedkey(s, secret,
                                                               finsecret,
                                                               finsecretlen))) {
        SSLerr(SSL_F_TLS13_CHANGE_CIPHER_STATE, ERR_R_INTERNAL_ERROR);
        goto err;
    }

    if (EVP_CipherInit_ex(ciph_ctx, ciph, NULL, key, NULL,
                          (which & SSL3_CC_WRITE)) <= 0) {
        SSLerr(SSL_F_TLS13_CHANGE_CIPHER_STATE, ERR_R_EVP_LIB);
        goto err;
    }

#ifdef OPENSSL_SSL_TRACE_CRYPTO
    if (s->msg_callback) {
        int wh = which & SSL3_CC_WRITE ? TLS1_RT_CRYPTO_WRITE : 0;

        if (ciph->key_len)
            s->msg_callback(2, s->version, wh | TLS1_RT_CRYPTO_KEY,
                            key, ciph->key_len, s, s->msg_callback_arg);

        wh |= TLS1_RT_CRYPTO_IV;
        s->msg_callback(2, s->version, wh, iv, ivlen, s,
                        s->msg_callback_arg);
    }
#endif

    ret = 1;
 err:
    OPENSSL_cleanse(secret, sizeof(secret));
    OPENSSL_cleanse(key, sizeof(key));
    return ret;
}
Commit	Line	Data
34574f19 MC	1	/*
	2	* Copyright 2016 The OpenSSL Project Authors. All Rights Reserved.
	3	*
	4	* Licensed under the OpenSSL license (the "License"). You may not use
	5	* this file except in compliance with the License. You can obtain a copy
	6	* in the file LICENSE in the source distribution or at
	7	* https://www.openssl.org/source/license.html
	8	*/
	9
	10	#include <stdlib.h>
	11	#include "ssl_locl.h"
	12	#include <openssl/evp.h>
	13	#include <openssl/kdf.h>
	14
	15	#define TLS13_MAX_LABEL_LEN 246
	16
	17	/* Always filled with zeros */
	18	static const unsigned char default_zeros[EVP_MAX_MD_SIZE];
	19
34574f19 MC	20	/*
	21	* Given a \|secret\|; a \|label\| of length \|labellen\|; and a \|hash\| of the
	22	* handshake messages, derive a new secret \|outlen\| bytes long and store it in
f5ca0b04 MC	23	* the location pointed to be \|out\|. The \|hash\| value may be NULL. Returns 1 on
f5ca0b04 MC	24	* success 0 on failure.
34574f19 MC	25	*/
	26	static int tls13_hkdf_expand(SSL s, const unsigned char secret,
	27	const unsigned char *label, size_t labellen,
	28	const unsigned char *hash,
	29	unsigned char *out, size_t outlen)
	30	{
	31	const unsigned char label_prefix[] = "TLS 1.3, ";
	32	const EVP_MD *md = ssl_handshake_md(s);
	33	EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new_id(EVP_PKEY_HKDF, NULL);
	34	int ret;
	35	size_t hkdflabellen;
	36	size_t hashlen;
	37	/*
	38	* 2 bytes for length of whole HkdfLabel + 1 byte for length of combined
	39	* prefix and label + bytes for the label itself + bytes for the hash
	40	*/
	41	unsigned char hkdflabel[sizeof(uint16_t) + sizeof(uint8_t) +
	42	+ sizeof(label_prefix) + TLS13_MAX_LABEL_LEN
	43	+ EVP_MAX_MD_SIZE];
	44	WPACKET pkt;
	45
	46	if (pctx == NULL)
	47	return 0;
	48
	49	hashlen = EVP_MD_size(md);
	50
	51	if (!WPACKET_init_static_len(&pkt, hkdflabel, sizeof(hkdflabel), 0)
	52	\|\| !WPACKET_put_bytes_u16(&pkt, outlen)
	53	\|\| !WPACKET_start_sub_packet_u8(&pkt)
	54	\|\| !WPACKET_memcpy(&pkt, label_prefix, sizeof(label_prefix) - 1)
	55	\|\| !WPACKET_memcpy(&pkt, label, labellen)
	56	\|\| !WPACKET_close(&pkt)
	57	\|\| !WPACKET_sub_memcpy_u8(&pkt, hash, (hash == NULL) ? 0 : hashlen)
	58	\|\| !WPACKET_get_total_written(&pkt, &hkdflabellen)
	59	\|\| !WPACKET_finish(&pkt)) {
	60	WPACKET_cleanup(&pkt);
	61	return 0;
	62	}
	63
	64	ret = EVP_PKEY_derive_init(pctx) <= 0
	65	\|\| EVP_PKEY_CTX_hkdf_mode(pctx, EVP_PKEY_HKDEF_MODE_EXPAND_ONLY)
	66	<= 0
	67	\|\| EVP_PKEY_CTX_set_hkdf_md(pctx, md) <= 0
	68	\|\| EVP_PKEY_CTX_set1_hkdf_key(pctx, secret, hashlen) <= 0
	69	\|\| EVP_PKEY_CTX_add1_hkdf_info(pctx, hkdflabel, hkdflabellen) <= 0
	70	\|\| EVP_PKEY_derive(pctx, out, &outlen) <= 0;
	71
	72	EVP_PKEY_CTX_free(pctx);
	73
	74	return ret == 0;
	75	}
	76
	77	/*
	78	* Given a input secret \|insecret\| and a \|label\| of length \|labellen\|, derive a
	79	* new \|secret\|. This will be the length of the current hash output size and
f5ca0b04 MC	80	* will be based on the current state of the handshake hashes. Returns 1 on
f5ca0b04 MC	81	* success 0 on failure.
34574f19 MC	82	*/
	83	int tls13_derive_secret(SSL s, const unsigned char insecret,
	84	const unsigned char *label, size_t labellen,
	85	unsigned char *secret)
	86	{
	87	unsigned char hash[EVP_MAX_MD_SIZE];
	88	size_t hashlen;
	89
	90	if (!ssl3_digest_cached_records(s, 1))
	91	return 0;
	92
	93	if (!ssl_handshake_hash(s, hash, sizeof(hash), &hashlen))
	94	return 0;
	95
	96	return tls13_hkdf_expand(s, insecret, label, labellen, hash, secret,
	97	hashlen);
	98	}
	99
	100	/*
f5ca0b04 MC	101	* Given a \|secret\| generate a \|key\| of length \|keylen\| bytes. Returns 1 on
f5ca0b04 MC	102	* success 0 on failure.
34574f19 MC	103	*/
	104	int tls13_derive_key(SSL s, const unsigned char secret, unsigned char *key,
	105	size_t keylen)
	106	{
f5ca0b04 MC	107	static const unsigned char keylabel[] = "key";
f5ca0b04 MC	108
34574f19 MC	109	return tls13_hkdf_expand(s, secret, keylabel, sizeof(keylabel) - 1, NULL,
	110	key, keylen);
	111	}
	112
	113	/*
f5ca0b04 MC	114	* Given a \|secret\| generate an \|iv\| of length \|ivlen\| bytes. Returns 1 on
f5ca0b04 MC	115	* success 0 on failure.
34574f19 MC	116	*/
	117	int tls13_derive_iv(SSL s, const unsigned char secret, unsigned char *iv,
	118	size_t ivlen)
	119	{
f5ca0b04 MC	120	static const unsigned char ivlabel[] = "iv";
f5ca0b04 MC	121
34574f19 MC	122	return tls13_hkdf_expand(s, secret, ivlabel, sizeof(ivlabel) - 1, NULL,
	123	iv, ivlen);
	124	}
	125
6484776f MC	126	static int tls13_derive_finishedkey(SSL s, const unsigned char secret,
	127	unsigned char *fin, size_t finlen)
	128	{
f5ca0b04 MC	129	static const unsigned char finishedlabel[] = "finished";
f5ca0b04 MC	130
6484776f MC	131	return tls13_hkdf_expand(s, secret, finishedlabel,
	132	sizeof(finishedlabel) - 1, NULL, fin, finlen);
	133	}
	134
34574f19 MC	135	/*
	136	* Given the previous secret \|prevsecret\| and a new input secret \|insecret\| of
	137	* length \|insecretlen\|, generate a new secret and store it in the location
f5ca0b04	138	* pointed to by \|outsecret\|. Returns 1 on success 0 on failure.
34574f19 MC	139	*/
	140	static int tls13_generate_secret(SSL s, const unsigned char prevsecret,
	141	const unsigned char *insecret,
	142	size_t insecretlen,
	143	unsigned char *outsecret)
	144	{
	145	const EVP_MD *md = ssl_handshake_md(s);
	146	size_t mdlen, prevsecretlen;
	147	int ret;
	148	EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new_id(EVP_PKEY_HKDF, NULL);
	149
	150	if (pctx == NULL)
	151	return 0;
	152
	153	mdlen = EVP_MD_size(md);
	154
	155	if (insecret == NULL) {
	156	insecret = default_zeros;
	157	insecretlen = mdlen;
	158	}
	159	if (prevsecret == NULL) {
	160	prevsecret = default_zeros;
	161	prevsecretlen = 0;
	162	} else {
	163	prevsecretlen = mdlen;
	164	}
	165
	166	ret = EVP_PKEY_derive_init(pctx) <= 0
	167	\|\| EVP_PKEY_CTX_hkdf_mode(pctx, EVP_PKEY_HKDEF_MODE_EXTRACT_ONLY)
	168	<= 0
	169	\|\| EVP_PKEY_CTX_set_hkdf_md(pctx, md) <= 0
	170	\|\| EVP_PKEY_CTX_set1_hkdf_key(pctx, insecret, insecretlen) <= 0
	171	\|\| EVP_PKEY_CTX_set1_hkdf_salt(pctx, prevsecret, prevsecretlen)
	172	<= 0
	173	\|\| EVP_PKEY_derive(pctx, outsecret, &mdlen)
	174	<= 0;
	175
	176	EVP_PKEY_CTX_free(pctx);
	177	return ret == 0;
	178	}
	179
	180	/*
	181	* Given an input secret \|insecret\| of length \|insecretlen\| generate the early
f5ca0b04	182	* secret. Returns 1 on success 0 on failure.
34574f19 MC	183	*/
	184	int tls13_generate_early_secret(SSL s, const unsigned char insecret,
	185	size_t insecretlen)
	186	{
	187	return tls13_generate_secret(s, NULL, insecret, insecretlen,
	188	(unsigned char *)&s->early_secret);
	189	}
	190
	191	/*
	192	* Given an input secret \|insecret\| of length \|insecretlen\| generate the
	193	* handshake secret. This requires the early secret to already have been
f5ca0b04	194	* generated. Returns 1 on success 0 on failure.
34574f19 MC	195	*/
	196	int tls13_generate_handshake_secret(SSL s, const unsigned char insecret,
	197	size_t insecretlen)
	198	{
	199	return tls13_generate_secret(s, s->early_secret, insecret, insecretlen,
	200	(unsigned char *)&s->handshake_secret);
	201	}
	202
	203	/*
	204	* Given the handshake secret \|prev\| of length \|prevlen\| generate the master
f5ca0b04 MC	205	* secret and store its length in \|*secret_size\|. Returns 1 on success 0 on
f5ca0b04 MC	206	* failure.
34574f19 MC	207	*/
	208	int tls13_generate_master_secret(SSL s, unsigned char out,
	209	unsigned char *prev, size_t prevlen,
	210	size_t *secret_size)
	211	{
	212	*secret_size = EVP_MD_size(ssl_handshake_md(s));
	213	return tls13_generate_secret(s, prev, NULL, 0, out);
	214	}
	215
92760c21	216	/*
f5ca0b04 MC	217	* Generates the mac for the Finished message. Returns the length of the MAC or
f5ca0b04 MC	218	* 0 on error.
92760c21 MC	219	*/
	220	size_t tls13_final_finish_mac(SSL s, const char str, size_t slen,
	221	unsigned char *out)
	222	{
6484776f MC	223	const EVP_MD *md = ssl_handshake_md(s);
	224	unsigned char hash[EVP_MAX_MD_SIZE];
	225	size_t hashlen, ret = 0;
	226	EVP_PKEY *key = NULL;
	227	EVP_MD_CTX *ctx = EVP_MD_CTX_new();
92760c21	228
6484776f MC	229	if (!ssl_handshake_hash(s, hash, sizeof(hash), &hashlen))
	230	goto err;
	231
	232	if (str == s->method->ssl3_enc->server_finished_label)
	233	key = EVP_PKEY_new_mac_key(EVP_PKEY_HMAC, NULL,
	234	s->server_finished_secret, hashlen);
	235	else
	236	key = EVP_PKEY_new_mac_key(EVP_PKEY_HMAC, NULL,
	237	s->client_finished_secret, hashlen);
	238
	239	if (key == NULL
	240	\|\| ctx == NULL
	241	\|\| EVP_DigestSignInit(ctx, NULL, md, NULL, key) <= 0
	242	\|\| EVP_DigestSignUpdate(ctx, hash, hashlen) <= 0
	243	\|\| EVP_DigestSignFinal(ctx, out, &hashlen) <= 0)
	244	goto err;
92760c21	245
6484776f MC	246	ret = hashlen;
	247	err:
	248	EVP_PKEY_free(key);
	249	EVP_MD_CTX_free(ctx);
	250	return ret;
92760c21 MC	251	}
	252
	253	/*
	254	* There isn't really a key block in TLSv1.3, but we still need this function
f5ca0b04	255	* for initialising the cipher and hash. Returns 1 on success or 0 on failure.
92760c21 MC	256	*/
	257	int tls13_setup_key_block(SSL *s)
	258	{
	259	const EVP_CIPHER *c;
	260	const EVP_MD *hash;
	261	int mac_type = NID_undef;
	262
	263	s->session->cipher = s->s3->tmp.new_cipher;
	264	if (!ssl_cipher_get_evp
	265	(s->session, &c, &hash, &mac_type, NULL, NULL, 0)) {
	266	SSLerr(SSL_F_TLS13_SETUP_KEY_BLOCK, SSL_R_CIPHER_OR_HASH_UNAVAILABLE);
	267	return 0;
	268	}
	269
	270	s->s3->tmp.new_sym_enc = c;
	271	s->s3->tmp.new_hash = hash;
	272
	273	return 1;
	274	}
	275
0d9824c1 MC	276	int tls13_change_cipher_state(SSL *s, int which)
0d9824c1 MC	277	{
f5ca0b04 MC	278	static const unsigned char client_handshake_traffic[] =
	279	"client handshake traffic secret";
	280	static const unsigned char client_application_traffic[] =
	281	"client application traffic secret";
	282	static const unsigned char server_handshake_traffic[] =
	283	"server handshake traffic secret";
	284	static const unsigned char server_application_traffic[] =
	285	"server application traffic secret";
0d9824c1	286	unsigned char key[EVP_MAX_KEY_LENGTH];
bebc0c7d	287	unsigned char *iv;
0d9824c1 MC	288	unsigned char secret[EVP_MAX_MD_SIZE];
0d9824c1 MC	289	unsigned char *insecret;
6484776f	290	unsigned char *finsecret = NULL;
0d9824c1	291	EVP_CIPHER_CTX *ciph_ctx;
902d036c	292	const EVP_CIPHER *ciph = s->s3->tmp.new_sym_enc;
0528f253	293	size_t ivlen, keylen, finsecretlen = 0;
0d9824c1 MC	294	const unsigned char *label;
0d9824c1 MC	295	size_t labellen;
6530c490	296	int ret = 0;
0d9824c1 MC	297
	298	if (which & SSL3_CC_READ) {
	299	if (s->enc_read_ctx != NULL) {
	300	EVP_CIPHER_CTX_reset(s->enc_read_ctx);
	301	} else {
	302	s->enc_read_ctx = EVP_CIPHER_CTX_new();
	303	if (s->enc_read_ctx == NULL) {
	304	SSLerr(SSL_F_TLS13_CHANGE_CIPHER_STATE, ERR_R_MALLOC_FAILURE);
	305	goto err;
	306	}
	307	}
	308	ciph_ctx = s->enc_read_ctx;
bebc0c7d	309	iv = s->read_iv;
0d9824c1 MC	310
	311	RECORD_LAYER_reset_read_sequence(&s->rlayer);
	312	} else {
	313	if (s->enc_write_ctx != NULL) {
	314	EVP_CIPHER_CTX_reset(s->enc_write_ctx);
	315	} else {
	316	s->enc_write_ctx = EVP_CIPHER_CTX_new();
	317	if (s->enc_write_ctx == NULL) {
	318	SSLerr(SSL_F_TLS13_CHANGE_CIPHER_STATE, ERR_R_MALLOC_FAILURE);
	319	goto err;
	320	}
	321	}
	322	ciph_ctx = s->enc_write_ctx;
bebc0c7d	323	iv = s->write_iv;
0d9824c1 MC	324
	325	RECORD_LAYER_reset_write_sequence(&s->rlayer);
	326	}
	327
	328	if (((which & SSL3_CC_CLIENT) && (which & SSL3_CC_WRITE))
	329	\|\| ((which & SSL3_CC_SERVER) && (which & SSL3_CC_READ))) {
	330	if (which & SSL3_CC_HANDSHAKE) {
	331	insecret = s->handshake_secret;
6484776f MC	332	finsecret = s->client_finished_secret;
6484776f MC	333	finsecretlen = sizeof(s->client_finished_secret);
0d9824c1 MC	334	label = client_handshake_traffic;
	335	labellen = sizeof(client_handshake_traffic) - 1;
	336	} else {
	337	insecret = s->session->master_key;
	338	label = client_application_traffic;
	339	labellen = sizeof(client_application_traffic) - 1;
	340	}
	341	} else {
	342	if (which & SSL3_CC_HANDSHAKE) {
	343	insecret = s->handshake_secret;
6484776f MC	344	finsecret = s->server_finished_secret;
6484776f MC	345	finsecretlen = sizeof(s->server_finished_secret);
0d9824c1 MC	346	label = server_handshake_traffic;
	347	labellen = sizeof(server_handshake_traffic) - 1;
	348	} else {
	349	insecret = s->session->master_key;
	350	label = server_application_traffic;
	351	labellen = sizeof(server_application_traffic) - 1;
	352	}
	353	}
	354
	355	if (!tls13_derive_secret(s, insecret, label, labellen, secret)) {
	356	SSLerr(SSL_F_TLS13_CHANGE_CIPHER_STATE, ERR_R_INTERNAL_ERROR);
	357	goto err;
	358	}
	359
	360	/* TODO(size_t): convert me */
	361	keylen = EVP_CIPHER_key_length(ciph);
bebc0c7d	362	ivlen = EVP_CIPHER_iv_length(ciph);
0d9824c1 MC	363
0d9824c1 MC	364	if (!tls13_derive_key(s, secret, key, keylen)
6484776f MC	365	\|\| !tls13_derive_iv(s, secret, iv, ivlen)
	366	\|\| (finsecret != NULL && !tls13_derive_finishedkey(s, secret,
	367	finsecret,
	368	finsecretlen))) {
0d9824c1 MC	369	SSLerr(SSL_F_TLS13_CHANGE_CIPHER_STATE, ERR_R_INTERNAL_ERROR);
	370	goto err;
	371	}
	372
bebc0c7d MC	373	if (EVP_CipherInit_ex(ciph_ctx, ciph, NULL, key, NULL,
	374	(which & SSL3_CC_WRITE)) <= 0) {
	375	SSLerr(SSL_F_TLS13_CHANGE_CIPHER_STATE, ERR_R_EVP_LIB);
	376	goto err;
0d9824c1 MC	377	}
	378
	379	#ifdef OPENSSL_SSL_TRACE_CRYPTO
	380	if (s->msg_callback) {
	381	int wh = which & SSL3_CC_WRITE ? TLS1_RT_CRYPTO_WRITE : 0;
	382
	383	if (ciph->key_len)
	384	s->msg_callback(2, s->version, wh \| TLS1_RT_CRYPTO_KEY,
	385	key, ciph->key_len, s, s->msg_callback_arg);
bebc0c7d MC	386
	387	wh \|= TLS1_RT_CRYPTO_IV;
	388	s->msg_callback(2, s->version, wh, iv, ivlen, s,
	389	s->msg_callback_arg);
0d9824c1 MC	390	}
	391	#endif
	392
6530c490	393	ret = 1;
0d9824c1 MC	394	err:
	395	OPENSSL_cleanse(secret, sizeof(secret));
	396	OPENSSL_cleanse(key, sizeof(key));
6530c490	397	return ret;
0d9824c1	398	}