From: jsing Date: Thu, 15 May 2014 13:53:46 +0000 (+0000) Subject: Add an AEAD EVP interface to libcrypto, along with AES-GCM AEAD X-Git-Url: http://artulab.com/gitweb/?a=commitdiff_plain;h=fc0ee2eb12cb7d038a2a1485d78d871a1a91193b;p=openbsd Add an AEAD EVP interface to libcrypto, along with AES-GCM AEAD implementations. This largely pulls in Adam Langley's AEAD patches from Chromium's OpenSSL. ok miod@ --- diff --git a/lib/libcrypto/crypto/Makefile b/lib/libcrypto/crypto/Makefile index 6d9eac13830..7e1f497223c 100644 --- a/lib/libcrypto/crypto/Makefile +++ b/lib/libcrypto/crypto/Makefile @@ -1,4 +1,4 @@ -# $OpenBSD: Makefile,v 1.33 2014/05/14 14:46:35 jsing Exp $ +# $OpenBSD: Makefile,v 1.34 2014/05/15 13:53:46 jsing Exp $ LIB= crypto @@ -152,7 +152,7 @@ SRCS+= c_all.c c_allc.c c_alld.c evp_lib.c bio_ok.c SRCS+= evp_pkey.c evp_pbe.c p5_crpt.c p5_crpt2.c SRCS+= e_old.c pmeth_lib.c pmeth_fn.c pmeth_gn.c m_sigver.c SRCS+= e_aes_cbc_hmac_sha1.c e_rc4_hmac_md5.c -SRCS+= e_chacha.c +SRCS+= e_chacha.c evp_aead.c # hmac/ SRCS+= hmac.c hm_ameth.c hm_pmeth.c diff --git a/lib/libcrypto/evp/e_aes.c b/lib/libcrypto/evp/e_aes.c index fd1c34526f4..e4d9457c96d 100644 --- a/lib/libcrypto/evp/e_aes.c +++ b/lib/libcrypto/evp/e_aes.c @@ -786,48 +786,46 @@ aes_gcm_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr) } } -static int -aes_gcm_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key, - const unsigned char *iv, int enc) +static ctr128_f +aes_gcm_set_key(AES_KEY *aes_key, GCM128_CONTEXT *gcm_ctx, + const unsigned char *key, size_t key_len) { - EVP_AES_GCM_CTX *gctx = ctx->cipher_data; - - if (!iv && !key) - return 1; - if (key) { - do { #ifdef BSAES_CAPABLE - if (BSAES_CAPABLE) { - AES_set_encrypt_key(key, ctx->key_len * 8, - &gctx->ks); - CRYPTO_gcm128_init(&gctx->gcm, &gctx->ks, - (block128_f)AES_encrypt); - gctx->ctr = - (ctr128_f)bsaes_ctr32_encrypt_blocks; - break; - } else + if (BSAES_CAPABLE) { + AES_set_encrypt_key(key, key_len * 8, aes_key); + CRYPTO_gcm128_init(gcm_ctx, aes_key, (block128_f)AES_encrypt); + return (ctr128_f)bsaes_ctr32_encrypt_blocks; + } else #endif #ifdef VPAES_CAPABLE - if (VPAES_CAPABLE) { - vpaes_set_encrypt_key(key, ctx->key_len * 8, - &gctx->ks); - CRYPTO_gcm128_init(&gctx->gcm, &gctx->ks, - (block128_f)vpaes_encrypt); - gctx->ctr = NULL; - break; - } else + if (VPAES_CAPABLE) { + vpaes_set_encrypt_key(key, key_len * 8, aes_key); + CRYPTO_gcm128_init(gcm_ctx, aes_key, (block128_f)vpaes_encrypt); + return NULL; + } else #endif - (void)0; /* terminate potentially open 'else' */ + (void)0; /* terminate potentially open 'else' */ - AES_set_encrypt_key(key, ctx->key_len * 8, &gctx->ks); - CRYPTO_gcm128_init(&gctx->gcm, &gctx->ks, - (block128_f)AES_encrypt); + AES_set_encrypt_key(key, key_len * 8, aes_key); + CRYPTO_gcm128_init(gcm_ctx, aes_key, (block128_f)AES_encrypt); #ifdef AES_CTR_ASM - gctx->ctr = (ctr128_f)AES_ctr32_encrypt; + return (ctr128_f)AES_ctr32_encrypt; #else - gctx->ctr = NULL; + return NULL; #endif - } while (0); +} + +static int +aes_gcm_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key, + const unsigned char *iv, int enc) +{ + EVP_AES_GCM_CTX *gctx = ctx->cipher_data; + + if (!iv && !key) + return 1; + if (key) { + gctx->ctr = aes_gcm_set_key(&gctx->ks, &gctx->gcm, + key, ctx->key_len); /* If we have an iv can set it directly, otherwise use * saved IV. @@ -1263,4 +1261,186 @@ BLOCK_CIPHER_custom(NID_aes, 192, 1,12, ccm, CCM, BLOCK_CIPHER_custom(NID_aes, 256, 1,12, ccm, CCM, EVP_CIPH_FLAG_FIPS|CUSTOM_FLAGS) +#define EVP_AEAD_AES_GCM_TAG_LEN 16 + +struct aead_aes_gcm_ctx { + union { + double align; + AES_KEY ks; + } ks; + GCM128_CONTEXT gcm; + ctr128_f ctr; + unsigned char tag_len; +}; + +static int +aead_aes_gcm_init(EVP_AEAD_CTX *ctx, const unsigned char *key, size_t key_len, + size_t tag_len) +{ + struct aead_aes_gcm_ctx *gcm_ctx; + const size_t key_bits = key_len * 8; + + if (key_bits != 128 && key_bits != 256) { + EVPerr(EVP_F_AEAD_AES_GCM_INIT, EVP_R_BAD_KEY_LENGTH); + return 0; /* EVP_AEAD_CTX_init should catch this. */ + } + + if (tag_len == EVP_AEAD_DEFAULT_TAG_LENGTH) + tag_len = EVP_AEAD_AES_GCM_TAG_LEN; + + if (tag_len > EVP_AEAD_AES_GCM_TAG_LEN) { + EVPerr(EVP_F_AEAD_AES_GCM_INIT, EVP_R_TAG_TOO_LARGE); + return 0; + } + + gcm_ctx = OPENSSL_malloc(sizeof(struct aead_aes_gcm_ctx)); + if (gcm_ctx == NULL) + return 0; + +#ifdef AESNI_CAPABLE + if (AESNI_CAPABLE) { + aesni_set_encrypt_key(key, key_bits, &gcm_ctx->ks.ks); + CRYPTO_gcm128_init(&gcm_ctx->gcm, &gcm_ctx->ks.ks, + (block128_f)aesni_encrypt); + gcm_ctx->ctr = (ctr128_f) aesni_ctr32_encrypt_blocks; + } else +#endif + { + gcm_ctx->ctr = aes_gcm_set_key(&gcm_ctx->ks.ks, &gcm_ctx->gcm, + key, key_len); + } + gcm_ctx->tag_len = tag_len; + ctx->aead_state = gcm_ctx; + + return 1; +} + +static void +aead_aes_gcm_cleanup(EVP_AEAD_CTX *ctx) +{ + struct aead_aes_gcm_ctx *gcm_ctx = ctx->aead_state; + + OPENSSL_free(gcm_ctx); +} + +static ssize_t +aead_aes_gcm_seal(const EVP_AEAD_CTX *ctx, unsigned char *out, + size_t max_out_len, const unsigned char *nonce, size_t nonce_len, + const unsigned char *in, size_t in_len, const unsigned char *ad, + size_t ad_len) +{ + size_t bulk = 0; + const struct aead_aes_gcm_ctx *gcm_ctx = ctx->aead_state; + GCM128_CONTEXT gcm; + + if (max_out_len < in_len + gcm_ctx->tag_len) { + EVPerr(EVP_F_AEAD_AES_GCM_SEAL, EVP_R_BUFFER_TOO_SMALL); + return -1; + } + + memcpy(&gcm, &gcm_ctx->gcm, sizeof(gcm)); + CRYPTO_gcm128_setiv(&gcm, nonce, nonce_len); + + if (ad_len > 0 && CRYPTO_gcm128_aad(&gcm, ad, ad_len)) + return -1; + + if (gcm_ctx->ctr) { + if (CRYPTO_gcm128_encrypt_ctr32(&gcm, in + bulk, out + bulk, + in_len - bulk, gcm_ctx->ctr)) + return -1; + } else { + if (CRYPTO_gcm128_encrypt(&gcm, in + bulk, out + bulk, + in_len - bulk)) + return -1; + } + + CRYPTO_gcm128_tag(&gcm, out + in_len, gcm_ctx->tag_len); + return in_len + gcm_ctx->tag_len; +} + +static ssize_t +aead_aes_gcm_open(const EVP_AEAD_CTX *ctx, unsigned char *out, + size_t max_out_len, const unsigned char *nonce, size_t nonce_len, + const unsigned char *in, size_t in_len, const unsigned char *ad, + size_t ad_len) +{ + size_t bulk = 0; + const struct aead_aes_gcm_ctx *gcm_ctx = ctx->aead_state; + unsigned char tag[EVP_AEAD_AES_GCM_TAG_LEN]; + size_t out_len; + GCM128_CONTEXT gcm; + + if (in_len < gcm_ctx->tag_len) { + EVPerr(EVP_F_AEAD_AES_GCM_OPEN, EVP_R_BAD_DECRYPT); + return -1; + } + + out_len = in_len - gcm_ctx->tag_len; + + if (max_out_len < out_len) { + EVPerr(EVP_F_AEAD_AES_GCM_OPEN, EVP_R_BUFFER_TOO_SMALL); + return -1; + } + + memcpy(&gcm, &gcm_ctx->gcm, sizeof(gcm)); + CRYPTO_gcm128_setiv(&gcm, nonce, nonce_len); + + if (CRYPTO_gcm128_aad(&gcm, ad, ad_len)) + return -1; + + if (gcm_ctx->ctr) { + if (CRYPTO_gcm128_decrypt_ctr32(&gcm, in + bulk, out + bulk, + in_len-bulk-gcm_ctx->tag_len, gcm_ctx->ctr)) + return -1; + } else { + if (CRYPTO_gcm128_decrypt(&gcm, in + bulk, out + bulk, + in_len - bulk - gcm_ctx->tag_len)) + return -1; + } + + CRYPTO_gcm128_tag(&gcm, tag, gcm_ctx->tag_len); + if (CRYPTO_memcmp(tag, in + out_len, gcm_ctx->tag_len) != 0) { + EVPerr(EVP_F_AEAD_AES_GCM_OPEN, EVP_R_BAD_DECRYPT); + return -1; + } + + return out_len; +} + +static const EVP_AEAD aead_aes_128_gcm = { + .key_len = 16, + .nonce_len = 12, + .overhead = EVP_AEAD_AES_GCM_TAG_LEN, + .max_tag_len = EVP_AEAD_AES_GCM_TAG_LEN, + + .init = aead_aes_gcm_init, + .cleanup = aead_aes_gcm_cleanup, + .seal = aead_aes_gcm_seal, + .open = aead_aes_gcm_open, +}; + +static const EVP_AEAD aead_aes_256_gcm = { + .key_len = 32, + .nonce_len = 12, + .overhead = EVP_AEAD_AES_GCM_TAG_LEN, + .max_tag_len = EVP_AEAD_AES_GCM_TAG_LEN, + + .init = aead_aes_gcm_init, + .cleanup = aead_aes_gcm_cleanup, + .seal = aead_aes_gcm_seal, + .open = aead_aes_gcm_open, +}; + +const EVP_AEAD * +EVP_aead_aes_128_gcm(void) +{ + return &aead_aes_128_gcm; +} + +const EVP_AEAD * +EVP_aead_aes_256_gcm(void) +{ + return &aead_aes_256_gcm; +} + #endif diff --git a/lib/libcrypto/evp/evp.h b/lib/libcrypto/evp/evp.h index 54aa8a4a663..f8395fbe7bd 100644 --- a/lib/libcrypto/evp/evp.h +++ b/lib/libcrypto/evp/evp.h @@ -1205,6 +1205,110 @@ void EVP_PKEY_meth_set_ctrl(EVP_PKEY_METHOD *pmeth, int (*ctrl)(EVP_PKEY_CTX *ctx, int type, int p1, void *p2), int (*ctrl_str)(EVP_PKEY_CTX *ctx, const char *type, const char *value)); +/* Authenticated Encryption with Additional Data. + * + * AEAD couples confidentiality and integrity in a single primtive. AEAD + * algorithms take a key and then can seal and open individual messages. Each + * message has a unique, per-message nonce and, optionally, additional data + * which is authenticated but not included in the output. */ + +struct evp_aead_st; +typedef struct evp_aead_st EVP_AEAD; + +#ifndef OPENSSL_NO_AES +/* EVP_aes_128_gcm is AES-128 in Galois Counter Mode. */ +const EVP_AEAD *EVP_aead_aes_128_gcm(void); +/* EVP_aes_256_gcm is AES-256 in Galois Counter Mode. */ +const EVP_AEAD *EVP_aead_aes_256_gcm(void); +#endif + +/* EVP_AEAD_key_length returns the length of the keys used. */ +size_t EVP_AEAD_key_length(const EVP_AEAD *aead); + +/* EVP_AEAD_nonce_length returns the length of the per-message nonce. */ +size_t EVP_AEAD_nonce_length(const EVP_AEAD *aead); + +/* EVP_AEAD_max_overhead returns the maximum number of additional bytes added + * by the act of sealing data with the AEAD. */ +size_t EVP_AEAD_max_overhead(const EVP_AEAD *aead); + +/* EVP_AEAD_max_tag_len returns the maximum tag length when using this AEAD. + * This * is the largest value that can be passed as a tag length to + * EVP_AEAD_CTX_init. */ +size_t EVP_AEAD_max_tag_len(const EVP_AEAD *aead); + +/* An EVP_AEAD_CTX represents an AEAD algorithm configured with a specific key + * and message-independent IV. */ +typedef struct evp_aead_ctx_st { + const EVP_AEAD *aead; + /* aead_state is an opaque pointer to the AEAD specific state. */ + void *aead_state; +} EVP_AEAD_CTX; + +/* EVP_AEAD_MAX_TAG_LENGTH is the maximum tag length used by any AEAD + * defined in this header. */ +#define EVP_AEAD_MAX_TAG_LENGTH 16 + +/* EVP_AEAD_DEFAULT_TAG_LENGTH is a magic value that can be passed to + * EVP_AEAD_CTX_init to indicate that the default tag length for an AEAD + * should be used. */ +#define EVP_AEAD_DEFAULT_TAG_LENGTH 0 + +/* EVP_AEAD_init initializes the context for the given AEAD algorithm. + * The implementation argument may be NULL to choose the default implementation. + * Authentication tags may be truncated by passing a tag length. A tag length + * of zero indicates the default tag length should be used. */ +int EVP_AEAD_CTX_init(EVP_AEAD_CTX *ctx, const EVP_AEAD *aead, + const unsigned char *key, size_t key_len, size_t tag_len, ENGINE *impl); + +/* EVP_AEAD_CTX_cleanup frees any data allocated for this context. */ +void EVP_AEAD_CTX_cleanup(EVP_AEAD_CTX *ctx); + +/* EVP_AEAD_CTX_seal encrypts and authenticates the input and authenticates + * any additional data (AD). The result is written as output, with the number + * of bytes written being returned, or -1 on error. + * + * This function may be called (with the same EVP_AEAD_CTX) concurrently with + * itself or EVP_AEAD_CTX_open. + * + * At most max_out_len bytes are written as output and, in order to ensure + * success, this value should be the length of the input plus the result of + * EVP_AEAD_overhead. + * + * The length of the nonce is must be equal to the result of + * EVP_AEAD_nonce_length for this AEAD. + * + * EVP_AEAD_CTX_seal never results in a partial output. If max_out_len is + * insufficient, -1 will be returned. + * + * If the input and output are aliased then out must be <= in. */ +ssize_t EVP_AEAD_CTX_seal(const EVP_AEAD_CTX *ctx, unsigned char *out, + size_t max_out_len, const unsigned char *nonce, size_t nonce_len, + const unsigned char *in, size_t in_len, const unsigned char *ad, + size_t ad_len); + +/* EVP_AEAD_CTX_open authenticates the input and additional data, decrypting + * the input and writing it as output. The number of bytes decrypted and + * written as output is returned, or -1 on error. + * + * This function may be called (with the same EVP_AEAD_CTX) concurrently with + * itself or EVP_AEAD_CTX_seal. + * + * At most the number of input bytes are written as output. In order to ensure + * success, max_out_len should be at least the same as the input length. + * + * The length of nonce must be equal to the result of EVP_AEAD_nonce_length + * for this AEAD. + * + * EVP_AEAD_CTX_open never results in a partial output. If max_out_len is + * insufficient, -1 will be returned. + * + * If the input and output are aliased then out must be <= in. */ +ssize_t EVP_AEAD_CTX_open(const EVP_AEAD_CTX *ctx, unsigned char *out, + size_t max_out_len, const unsigned char *nonce, size_t nonce_len, + const unsigned char *in, size_t in_len, const unsigned char *ad, + size_t ad_len); + void EVP_add_alg_module(void); /* BEGIN ERROR CODES */ @@ -1216,6 +1320,11 @@ void ERR_load_EVP_strings(void); /* Error codes for the EVP functions. */ /* Function codes. */ +#define EVP_F_AEAD_AES_GCM_INIT 187 +#define EVP_F_AEAD_AES_GCM_OPEN 188 +#define EVP_F_AEAD_AES_GCM_SEAL 189 +#define EVP_F_AEAD_CTX_OPEN 185 +#define EVP_F_AEAD_CTX_SEAL 186 #define EVP_F_AESNI_INIT_KEY 165 #define EVP_F_AESNI_XTS_CIPHER 176 #define EVP_F_AES_INIT_KEY 133 @@ -1230,6 +1339,9 @@ void ERR_load_EVP_strings(void); #define EVP_F_DSA_PKEY2PKCS8 135 #define EVP_F_ECDSA_PKEY2PKCS8 129 #define EVP_F_ECKEY_PKEY2PKCS8 132 +#define EVP_F_EVP_AEAD_CTX_INIT 180 +#define EVP_F_EVP_AEAD_CTX_OPEN 190 +#define EVP_F_EVP_AEAD_CTX_SEAL 191 #define EVP_F_EVP_CIPHERINIT_EX 123 #define EVP_F_EVP_CIPHER_CTX_COPY 163 #define EVP_F_EVP_CIPHER_CTX_CTRL 124 @@ -1345,10 +1457,12 @@ void ERR_load_EVP_strings(void); #define EVP_R_NO_VERIFY_FUNCTION_CONFIGURED 105 #define EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE 150 #define EVP_R_OPERATON_NOT_INITIALIZED 151 +#define EVP_R_OUTPUT_ALIASES_INPUT 172 #define EVP_R_PKCS8_UNKNOWN_BROKEN_TYPE 117 #define EVP_R_PRIVATE_KEY_DECODE_ERROR 145 #define EVP_R_PRIVATE_KEY_ENCODE_ERROR 146 #define EVP_R_PUBLIC_KEY_NOT_RSA 106 +#define EVP_R_TAG_TOO_LARGE 171 #define EVP_R_TOO_LARGE 164 #define EVP_R_UNKNOWN_CIPHER 160 #define EVP_R_UNKNOWN_DIGEST 161 diff --git a/lib/libcrypto/evp/evp_aead.c b/lib/libcrypto/evp/evp_aead.c new file mode 100644 index 00000000000..137e3dd05bf --- /dev/null +++ b/lib/libcrypto/evp/evp_aead.c @@ -0,0 +1,192 @@ +/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) + * All rights reserved. + * + * This package is an SSL implementation written + * by Eric Young (eay@cryptsoft.com). + * The implementation was written so as to conform with Netscapes SSL. + * + * This library is free for commercial and non-commercial use as long as + * the following conditions are aheared to. The following conditions + * apply to all code found in this distribution, be it the RC4, RSA, + * lhash, DES, etc., code; not just the SSL code. The SSL documentation + * included with this distribution is covered by the same copyright terms + * except that the holder is Tim Hudson (tjh@cryptsoft.com). + * + * Copyright remains Eric Young's, and as such any Copyright notices in + * the code are not to be removed. + * If this package is used in a product, Eric Young should be given attribution + * as the author of the parts of the library used. + * This can be in the form of a textual message at program startup or + * in documentation (online or textual) provided with the package. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * "This product includes cryptographic software written by + * Eric Young (eay@cryptsoft.com)" + * The word 'cryptographic' can be left out if the rouines from the library + * being used are not cryptographic related :-). + * 4. If you include any Windows specific code (or a derivative thereof) from + * the apps directory (application code) you must include an acknowledgement: + * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" + * + * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * The licence and distribution terms for any publically available version or + * derivative of this code cannot be changed. i.e. this code cannot simply be + * copied and put under another distribution licence + * [including the GNU Public Licence.] + */ + +#include +#include + +#include +#include + +#include "evp_locl.h" + +size_t EVP_AEAD_key_length(const EVP_AEAD *aead) + { + return aead->key_len; + } + +size_t EVP_AEAD_nonce_length(const EVP_AEAD *aead) + { + return aead->nonce_len; + } + +size_t EVP_AEAD_max_overhead(const EVP_AEAD *aead) + { + return aead->overhead; + } + +size_t EVP_AEAD_max_tag_len(const EVP_AEAD *aead) + { + return aead->max_tag_len; + } + +int EVP_AEAD_CTX_init(EVP_AEAD_CTX *ctx, const EVP_AEAD *aead, + const unsigned char *key, size_t key_len, + size_t tag_len, ENGINE *impl) + { + ctx->aead = aead; + if (key_len != aead->key_len) + { + EVPerr(EVP_F_EVP_AEAD_CTX_INIT,EVP_R_UNSUPPORTED_KEY_SIZE); + return 0; + } + return aead->init(ctx, key, key_len, tag_len); + } + +void EVP_AEAD_CTX_cleanup(EVP_AEAD_CTX *ctx) + { + if (ctx->aead == NULL) + return; + ctx->aead->cleanup(ctx); + ctx->aead = NULL; + } + +/* check_alias returns 0 if out points within the buffer determined by in + * and in_len and 1 otherwise. + * + * When processing, there's only an issue if out points within in[:in_len] + * and isn't equal to in. If that's the case then writing the output will + * stomp input that hasn't been read yet. + * + * This function checks for that case. */ +static int check_alias(const unsigned char *in, size_t in_len, + const unsigned char *out) + { + if (out <= in) + return 1; + if (in + in_len <= out) + return 1; + return 0; + } + +ssize_t EVP_AEAD_CTX_seal(const EVP_AEAD_CTX *ctx, + unsigned char *out, size_t max_out_len, + const unsigned char *nonce, size_t nonce_len, + const unsigned char *in, size_t in_len, + const unsigned char *ad, size_t ad_len) + { + size_t possible_out_len = in_len + ctx->aead->overhead; + ssize_t r; + + if (possible_out_len < in_len /* overflow */ || + possible_out_len > SSIZE_MAX /* return value cannot be + represented */) + { + EVPerr(EVP_F_EVP_AEAD_CTX_SEAL, EVP_R_TOO_LARGE); + goto error; + } + + if (!check_alias(in, in_len, out)) + { + EVPerr(EVP_F_EVP_AEAD_CTX_SEAL, EVP_R_OUTPUT_ALIASES_INPUT); + goto error; + } + + r = ctx->aead->seal(ctx, out, max_out_len, nonce, nonce_len, + in, in_len, ad, ad_len); + if (r >= 0) + return r; + +error: + /* In the event of an error, clear the output buffer so that a caller + * that doesn't check the return value doesn't send raw data. */ + memset(out, 0, max_out_len); + return -1; + } + +ssize_t EVP_AEAD_CTX_open(const EVP_AEAD_CTX *ctx, + unsigned char *out, size_t max_out_len, + const unsigned char *nonce, size_t nonce_len, + const unsigned char *in, size_t in_len, + const unsigned char *ad, size_t ad_len) + { + ssize_t r; + + if (in_len > SSIZE_MAX) + { + EVPerr(EVP_F_EVP_AEAD_CTX_OPEN, EVP_R_TOO_LARGE); + goto error; /* may not be able to represent return value. */ + } + + if (!check_alias(in, in_len, out)) + { + EVPerr(EVP_F_EVP_AEAD_CTX_OPEN, EVP_R_OUTPUT_ALIASES_INPUT); + goto error; + } + + r = ctx->aead->open(ctx, out, max_out_len, nonce, nonce_len, + in, in_len, ad, ad_len); + + if (r >= 0) + return r; + +error: + /* In the event of an error, clear the output buffer so that a caller + * that doesn't check the return value doesn't try and process bad + * data. */ + memset(out, 0, max_out_len); + return -1; + } diff --git a/lib/libcrypto/evp/evp_err.c b/lib/libcrypto/evp/evp_err.c index 80247319389..9391036d0fc 100644 --- a/lib/libcrypto/evp/evp_err.c +++ b/lib/libcrypto/evp/evp_err.c @@ -69,6 +69,9 @@ #define ERR_REASON(reason) ERR_PACK(ERR_LIB_EVP,0,reason) static ERR_STRING_DATA EVP_str_functs[] = { + {ERR_FUNC(EVP_F_AEAD_AES_GCM_INIT), "AEAD_AES_GCM_INIT"}, + {ERR_FUNC(EVP_F_AEAD_AES_GCM_OPEN), "AEAD_AES_GCM_OPEN"}, + {ERR_FUNC(EVP_F_AEAD_AES_GCM_SEAL), "AEAD_AES_GCM_SEAL"}, {ERR_FUNC(EVP_F_AESNI_INIT_KEY), "AESNI_INIT_KEY"}, {ERR_FUNC(EVP_F_AESNI_XTS_CIPHER), "AESNI_XTS_CIPHER"}, {ERR_FUNC(EVP_F_AES_INIT_KEY), "AES_INIT_KEY"}, @@ -83,6 +86,9 @@ static ERR_STRING_DATA EVP_str_functs[] = { {ERR_FUNC(EVP_F_DSA_PKEY2PKCS8), "DSA_PKEY2PKCS8"}, {ERR_FUNC(EVP_F_ECDSA_PKEY2PKCS8), "ECDSA_PKEY2PKCS8"}, {ERR_FUNC(EVP_F_ECKEY_PKEY2PKCS8), "ECKEY_PKEY2PKCS8"}, + {ERR_FUNC(EVP_F_EVP_AEAD_CTX_INIT), "EVP_AEAD_CTX_init"}, + {ERR_FUNC(EVP_F_EVP_AEAD_CTX_OPEN), "EVP_AEAD_CTX_open"}, + {ERR_FUNC(EVP_F_EVP_AEAD_CTX_SEAL), "EVP_AEAD_CTX_seal"}, {ERR_FUNC(EVP_F_EVP_CIPHERINIT_EX), "EVP_CipherInit_ex"}, {ERR_FUNC(EVP_F_EVP_CIPHER_CTX_COPY), "EVP_CIPHER_CTX_copy"}, {ERR_FUNC(EVP_F_EVP_CIPHER_CTX_CTRL), "EVP_CIPHER_CTX_ctrl"}, @@ -200,10 +206,12 @@ static ERR_STRING_DATA EVP_str_reasons[] = { {ERR_REASON(EVP_R_NO_VERIFY_FUNCTION_CONFIGURED), "no verify function configured"}, {ERR_REASON(EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE), "operation not supported for this keytype"}, {ERR_REASON(EVP_R_OPERATON_NOT_INITIALIZED), "operaton not initialized"}, + {ERR_REASON(EVP_R_OUTPUT_ALIASES_INPUT), "output aliases input"}, {ERR_REASON(EVP_R_PKCS8_UNKNOWN_BROKEN_TYPE), "pkcs8 unknown broken type"}, {ERR_REASON(EVP_R_PRIVATE_KEY_DECODE_ERROR), "private key decode error"}, {ERR_REASON(EVP_R_PRIVATE_KEY_ENCODE_ERROR), "private key encode error"}, {ERR_REASON(EVP_R_PUBLIC_KEY_NOT_RSA) , "public key not rsa"}, + {ERR_REASON(EVP_R_TAG_TOO_LARGE), "tag too large"}, {ERR_REASON(EVP_R_TOO_LARGE) , "too large"}, {ERR_REASON(EVP_R_UNKNOWN_CIPHER) , "unknown cipher"}, {ERR_REASON(EVP_R_UNKNOWN_DIGEST) , "unknown digest"}, diff --git a/lib/libcrypto/evp/evp_locl.h b/lib/libcrypto/evp/evp_locl.h index 673c85f8bde..6f9218eafc9 100644 --- a/lib/libcrypto/evp/evp_locl.h +++ b/lib/libcrypto/evp/evp_locl.h @@ -342,3 +342,25 @@ void evp_pkey_set_cb_translate(BN_GENCB *cb, EVP_PKEY_CTX *ctx); int PKCS5_v2_PBKDF2_keyivgen(EVP_CIPHER_CTX *ctx, const char *pass, int passlen, ASN1_TYPE *param, const EVP_CIPHER *c, const EVP_MD *md, int en_de); + +/* EVP_AEAD represents a specific AEAD algorithm. */ +struct evp_aead_st { + unsigned char key_len; + unsigned char nonce_len; + unsigned char overhead; + unsigned char max_tag_len; + + int (*init)(struct evp_aead_ctx_st*, const unsigned char *key, + size_t key_len, size_t tag_len); + void (*cleanup)(struct evp_aead_ctx_st*); + + ssize_t (*seal)(const struct evp_aead_ctx_st *ctx, unsigned char *out, + size_t max_out_len, const unsigned char *nonce, size_t nonce_len, + const unsigned char *in, size_t in_len, const unsigned char *ad, + size_t ad_len); + + ssize_t (*open)(const struct evp_aead_ctx_st *ctx, unsigned char *out, + size_t max_out_len, const unsigned char *nonce, size_t nonce_len, + const unsigned char *in, size_t in_len, const unsigned char *ad, + size_t ad_len); +}; diff --git a/lib/libssl/src/crypto/evp/e_aes.c b/lib/libssl/src/crypto/evp/e_aes.c index fd1c34526f4..e4d9457c96d 100644 --- a/lib/libssl/src/crypto/evp/e_aes.c +++ b/lib/libssl/src/crypto/evp/e_aes.c @@ -786,48 +786,46 @@ aes_gcm_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr) } } -static int -aes_gcm_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key, - const unsigned char *iv, int enc) +static ctr128_f +aes_gcm_set_key(AES_KEY *aes_key, GCM128_CONTEXT *gcm_ctx, + const unsigned char *key, size_t key_len) { - EVP_AES_GCM_CTX *gctx = ctx->cipher_data; - - if (!iv && !key) - return 1; - if (key) { - do { #ifdef BSAES_CAPABLE - if (BSAES_CAPABLE) { - AES_set_encrypt_key(key, ctx->key_len * 8, - &gctx->ks); - CRYPTO_gcm128_init(&gctx->gcm, &gctx->ks, - (block128_f)AES_encrypt); - gctx->ctr = - (ctr128_f)bsaes_ctr32_encrypt_blocks; - break; - } else + if (BSAES_CAPABLE) { + AES_set_encrypt_key(key, key_len * 8, aes_key); + CRYPTO_gcm128_init(gcm_ctx, aes_key, (block128_f)AES_encrypt); + return (ctr128_f)bsaes_ctr32_encrypt_blocks; + } else #endif #ifdef VPAES_CAPABLE - if (VPAES_CAPABLE) { - vpaes_set_encrypt_key(key, ctx->key_len * 8, - &gctx->ks); - CRYPTO_gcm128_init(&gctx->gcm, &gctx->ks, - (block128_f)vpaes_encrypt); - gctx->ctr = NULL; - break; - } else + if (VPAES_CAPABLE) { + vpaes_set_encrypt_key(key, key_len * 8, aes_key); + CRYPTO_gcm128_init(gcm_ctx, aes_key, (block128_f)vpaes_encrypt); + return NULL; + } else #endif - (void)0; /* terminate potentially open 'else' */ + (void)0; /* terminate potentially open 'else' */ - AES_set_encrypt_key(key, ctx->key_len * 8, &gctx->ks); - CRYPTO_gcm128_init(&gctx->gcm, &gctx->ks, - (block128_f)AES_encrypt); + AES_set_encrypt_key(key, key_len * 8, aes_key); + CRYPTO_gcm128_init(gcm_ctx, aes_key, (block128_f)AES_encrypt); #ifdef AES_CTR_ASM - gctx->ctr = (ctr128_f)AES_ctr32_encrypt; + return (ctr128_f)AES_ctr32_encrypt; #else - gctx->ctr = NULL; + return NULL; #endif - } while (0); +} + +static int +aes_gcm_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key, + const unsigned char *iv, int enc) +{ + EVP_AES_GCM_CTX *gctx = ctx->cipher_data; + + if (!iv && !key) + return 1; + if (key) { + gctx->ctr = aes_gcm_set_key(&gctx->ks, &gctx->gcm, + key, ctx->key_len); /* If we have an iv can set it directly, otherwise use * saved IV. @@ -1263,4 +1261,186 @@ BLOCK_CIPHER_custom(NID_aes, 192, 1,12, ccm, CCM, BLOCK_CIPHER_custom(NID_aes, 256, 1,12, ccm, CCM, EVP_CIPH_FLAG_FIPS|CUSTOM_FLAGS) +#define EVP_AEAD_AES_GCM_TAG_LEN 16 + +struct aead_aes_gcm_ctx { + union { + double align; + AES_KEY ks; + } ks; + GCM128_CONTEXT gcm; + ctr128_f ctr; + unsigned char tag_len; +}; + +static int +aead_aes_gcm_init(EVP_AEAD_CTX *ctx, const unsigned char *key, size_t key_len, + size_t tag_len) +{ + struct aead_aes_gcm_ctx *gcm_ctx; + const size_t key_bits = key_len * 8; + + if (key_bits != 128 && key_bits != 256) { + EVPerr(EVP_F_AEAD_AES_GCM_INIT, EVP_R_BAD_KEY_LENGTH); + return 0; /* EVP_AEAD_CTX_init should catch this. */ + } + + if (tag_len == EVP_AEAD_DEFAULT_TAG_LENGTH) + tag_len = EVP_AEAD_AES_GCM_TAG_LEN; + + if (tag_len > EVP_AEAD_AES_GCM_TAG_LEN) { + EVPerr(EVP_F_AEAD_AES_GCM_INIT, EVP_R_TAG_TOO_LARGE); + return 0; + } + + gcm_ctx = OPENSSL_malloc(sizeof(struct aead_aes_gcm_ctx)); + if (gcm_ctx == NULL) + return 0; + +#ifdef AESNI_CAPABLE + if (AESNI_CAPABLE) { + aesni_set_encrypt_key(key, key_bits, &gcm_ctx->ks.ks); + CRYPTO_gcm128_init(&gcm_ctx->gcm, &gcm_ctx->ks.ks, + (block128_f)aesni_encrypt); + gcm_ctx->ctr = (ctr128_f) aesni_ctr32_encrypt_blocks; + } else +#endif + { + gcm_ctx->ctr = aes_gcm_set_key(&gcm_ctx->ks.ks, &gcm_ctx->gcm, + key, key_len); + } + gcm_ctx->tag_len = tag_len; + ctx->aead_state = gcm_ctx; + + return 1; +} + +static void +aead_aes_gcm_cleanup(EVP_AEAD_CTX *ctx) +{ + struct aead_aes_gcm_ctx *gcm_ctx = ctx->aead_state; + + OPENSSL_free(gcm_ctx); +} + +static ssize_t +aead_aes_gcm_seal(const EVP_AEAD_CTX *ctx, unsigned char *out, + size_t max_out_len, const unsigned char *nonce, size_t nonce_len, + const unsigned char *in, size_t in_len, const unsigned char *ad, + size_t ad_len) +{ + size_t bulk = 0; + const struct aead_aes_gcm_ctx *gcm_ctx = ctx->aead_state; + GCM128_CONTEXT gcm; + + if (max_out_len < in_len + gcm_ctx->tag_len) { + EVPerr(EVP_F_AEAD_AES_GCM_SEAL, EVP_R_BUFFER_TOO_SMALL); + return -1; + } + + memcpy(&gcm, &gcm_ctx->gcm, sizeof(gcm)); + CRYPTO_gcm128_setiv(&gcm, nonce, nonce_len); + + if (ad_len > 0 && CRYPTO_gcm128_aad(&gcm, ad, ad_len)) + return -1; + + if (gcm_ctx->ctr) { + if (CRYPTO_gcm128_encrypt_ctr32(&gcm, in + bulk, out + bulk, + in_len - bulk, gcm_ctx->ctr)) + return -1; + } else { + if (CRYPTO_gcm128_encrypt(&gcm, in + bulk, out + bulk, + in_len - bulk)) + return -1; + } + + CRYPTO_gcm128_tag(&gcm, out + in_len, gcm_ctx->tag_len); + return in_len + gcm_ctx->tag_len; +} + +static ssize_t +aead_aes_gcm_open(const EVP_AEAD_CTX *ctx, unsigned char *out, + size_t max_out_len, const unsigned char *nonce, size_t nonce_len, + const unsigned char *in, size_t in_len, const unsigned char *ad, + size_t ad_len) +{ + size_t bulk = 0; + const struct aead_aes_gcm_ctx *gcm_ctx = ctx->aead_state; + unsigned char tag[EVP_AEAD_AES_GCM_TAG_LEN]; + size_t out_len; + GCM128_CONTEXT gcm; + + if (in_len < gcm_ctx->tag_len) { + EVPerr(EVP_F_AEAD_AES_GCM_OPEN, EVP_R_BAD_DECRYPT); + return -1; + } + + out_len = in_len - gcm_ctx->tag_len; + + if (max_out_len < out_len) { + EVPerr(EVP_F_AEAD_AES_GCM_OPEN, EVP_R_BUFFER_TOO_SMALL); + return -1; + } + + memcpy(&gcm, &gcm_ctx->gcm, sizeof(gcm)); + CRYPTO_gcm128_setiv(&gcm, nonce, nonce_len); + + if (CRYPTO_gcm128_aad(&gcm, ad, ad_len)) + return -1; + + if (gcm_ctx->ctr) { + if (CRYPTO_gcm128_decrypt_ctr32(&gcm, in + bulk, out + bulk, + in_len-bulk-gcm_ctx->tag_len, gcm_ctx->ctr)) + return -1; + } else { + if (CRYPTO_gcm128_decrypt(&gcm, in + bulk, out + bulk, + in_len - bulk - gcm_ctx->tag_len)) + return -1; + } + + CRYPTO_gcm128_tag(&gcm, tag, gcm_ctx->tag_len); + if (CRYPTO_memcmp(tag, in + out_len, gcm_ctx->tag_len) != 0) { + EVPerr(EVP_F_AEAD_AES_GCM_OPEN, EVP_R_BAD_DECRYPT); + return -1; + } + + return out_len; +} + +static const EVP_AEAD aead_aes_128_gcm = { + .key_len = 16, + .nonce_len = 12, + .overhead = EVP_AEAD_AES_GCM_TAG_LEN, + .max_tag_len = EVP_AEAD_AES_GCM_TAG_LEN, + + .init = aead_aes_gcm_init, + .cleanup = aead_aes_gcm_cleanup, + .seal = aead_aes_gcm_seal, + .open = aead_aes_gcm_open, +}; + +static const EVP_AEAD aead_aes_256_gcm = { + .key_len = 32, + .nonce_len = 12, + .overhead = EVP_AEAD_AES_GCM_TAG_LEN, + .max_tag_len = EVP_AEAD_AES_GCM_TAG_LEN, + + .init = aead_aes_gcm_init, + .cleanup = aead_aes_gcm_cleanup, + .seal = aead_aes_gcm_seal, + .open = aead_aes_gcm_open, +}; + +const EVP_AEAD * +EVP_aead_aes_128_gcm(void) +{ + return &aead_aes_128_gcm; +} + +const EVP_AEAD * +EVP_aead_aes_256_gcm(void) +{ + return &aead_aes_256_gcm; +} + #endif diff --git a/lib/libssl/src/crypto/evp/evp.h b/lib/libssl/src/crypto/evp/evp.h index 54aa8a4a663..f8395fbe7bd 100644 --- a/lib/libssl/src/crypto/evp/evp.h +++ b/lib/libssl/src/crypto/evp/evp.h @@ -1205,6 +1205,110 @@ void EVP_PKEY_meth_set_ctrl(EVP_PKEY_METHOD *pmeth, int (*ctrl)(EVP_PKEY_CTX *ctx, int type, int p1, void *p2), int (*ctrl_str)(EVP_PKEY_CTX *ctx, const char *type, const char *value)); +/* Authenticated Encryption with Additional Data. + * + * AEAD couples confidentiality and integrity in a single primtive. AEAD + * algorithms take a key and then can seal and open individual messages. Each + * message has a unique, per-message nonce and, optionally, additional data + * which is authenticated but not included in the output. */ + +struct evp_aead_st; +typedef struct evp_aead_st EVP_AEAD; + +#ifndef OPENSSL_NO_AES +/* EVP_aes_128_gcm is AES-128 in Galois Counter Mode. */ +const EVP_AEAD *EVP_aead_aes_128_gcm(void); +/* EVP_aes_256_gcm is AES-256 in Galois Counter Mode. */ +const EVP_AEAD *EVP_aead_aes_256_gcm(void); +#endif + +/* EVP_AEAD_key_length returns the length of the keys used. */ +size_t EVP_AEAD_key_length(const EVP_AEAD *aead); + +/* EVP_AEAD_nonce_length returns the length of the per-message nonce. */ +size_t EVP_AEAD_nonce_length(const EVP_AEAD *aead); + +/* EVP_AEAD_max_overhead returns the maximum number of additional bytes added + * by the act of sealing data with the AEAD. */ +size_t EVP_AEAD_max_overhead(const EVP_AEAD *aead); + +/* EVP_AEAD_max_tag_len returns the maximum tag length when using this AEAD. + * This * is the largest value that can be passed as a tag length to + * EVP_AEAD_CTX_init. */ +size_t EVP_AEAD_max_tag_len(const EVP_AEAD *aead); + +/* An EVP_AEAD_CTX represents an AEAD algorithm configured with a specific key + * and message-independent IV. */ +typedef struct evp_aead_ctx_st { + const EVP_AEAD *aead; + /* aead_state is an opaque pointer to the AEAD specific state. */ + void *aead_state; +} EVP_AEAD_CTX; + +/* EVP_AEAD_MAX_TAG_LENGTH is the maximum tag length used by any AEAD + * defined in this header. */ +#define EVP_AEAD_MAX_TAG_LENGTH 16 + +/* EVP_AEAD_DEFAULT_TAG_LENGTH is a magic value that can be passed to + * EVP_AEAD_CTX_init to indicate that the default tag length for an AEAD + * should be used. */ +#define EVP_AEAD_DEFAULT_TAG_LENGTH 0 + +/* EVP_AEAD_init initializes the context for the given AEAD algorithm. + * The implementation argument may be NULL to choose the default implementation. + * Authentication tags may be truncated by passing a tag length. A tag length + * of zero indicates the default tag length should be used. */ +int EVP_AEAD_CTX_init(EVP_AEAD_CTX *ctx, const EVP_AEAD *aead, + const unsigned char *key, size_t key_len, size_t tag_len, ENGINE *impl); + +/* EVP_AEAD_CTX_cleanup frees any data allocated for this context. */ +void EVP_AEAD_CTX_cleanup(EVP_AEAD_CTX *ctx); + +/* EVP_AEAD_CTX_seal encrypts and authenticates the input and authenticates + * any additional data (AD). The result is written as output, with the number + * of bytes written being returned, or -1 on error. + * + * This function may be called (with the same EVP_AEAD_CTX) concurrently with + * itself or EVP_AEAD_CTX_open. + * + * At most max_out_len bytes are written as output and, in order to ensure + * success, this value should be the length of the input plus the result of + * EVP_AEAD_overhead. + * + * The length of the nonce is must be equal to the result of + * EVP_AEAD_nonce_length for this AEAD. + * + * EVP_AEAD_CTX_seal never results in a partial output. If max_out_len is + * insufficient, -1 will be returned. + * + * If the input and output are aliased then out must be <= in. */ +ssize_t EVP_AEAD_CTX_seal(const EVP_AEAD_CTX *ctx, unsigned char *out, + size_t max_out_len, const unsigned char *nonce, size_t nonce_len, + const unsigned char *in, size_t in_len, const unsigned char *ad, + size_t ad_len); + +/* EVP_AEAD_CTX_open authenticates the input and additional data, decrypting + * the input and writing it as output. The number of bytes decrypted and + * written as output is returned, or -1 on error. + * + * This function may be called (with the same EVP_AEAD_CTX) concurrently with + * itself or EVP_AEAD_CTX_seal. + * + * At most the number of input bytes are written as output. In order to ensure + * success, max_out_len should be at least the same as the input length. + * + * The length of nonce must be equal to the result of EVP_AEAD_nonce_length + * for this AEAD. + * + * EVP_AEAD_CTX_open never results in a partial output. If max_out_len is + * insufficient, -1 will be returned. + * + * If the input and output are aliased then out must be <= in. */ +ssize_t EVP_AEAD_CTX_open(const EVP_AEAD_CTX *ctx, unsigned char *out, + size_t max_out_len, const unsigned char *nonce, size_t nonce_len, + const unsigned char *in, size_t in_len, const unsigned char *ad, + size_t ad_len); + void EVP_add_alg_module(void); /* BEGIN ERROR CODES */ @@ -1216,6 +1320,11 @@ void ERR_load_EVP_strings(void); /* Error codes for the EVP functions. */ /* Function codes. */ +#define EVP_F_AEAD_AES_GCM_INIT 187 +#define EVP_F_AEAD_AES_GCM_OPEN 188 +#define EVP_F_AEAD_AES_GCM_SEAL 189 +#define EVP_F_AEAD_CTX_OPEN 185 +#define EVP_F_AEAD_CTX_SEAL 186 #define EVP_F_AESNI_INIT_KEY 165 #define EVP_F_AESNI_XTS_CIPHER 176 #define EVP_F_AES_INIT_KEY 133 @@ -1230,6 +1339,9 @@ void ERR_load_EVP_strings(void); #define EVP_F_DSA_PKEY2PKCS8 135 #define EVP_F_ECDSA_PKEY2PKCS8 129 #define EVP_F_ECKEY_PKEY2PKCS8 132 +#define EVP_F_EVP_AEAD_CTX_INIT 180 +#define EVP_F_EVP_AEAD_CTX_OPEN 190 +#define EVP_F_EVP_AEAD_CTX_SEAL 191 #define EVP_F_EVP_CIPHERINIT_EX 123 #define EVP_F_EVP_CIPHER_CTX_COPY 163 #define EVP_F_EVP_CIPHER_CTX_CTRL 124 @@ -1345,10 +1457,12 @@ void ERR_load_EVP_strings(void); #define EVP_R_NO_VERIFY_FUNCTION_CONFIGURED 105 #define EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE 150 #define EVP_R_OPERATON_NOT_INITIALIZED 151 +#define EVP_R_OUTPUT_ALIASES_INPUT 172 #define EVP_R_PKCS8_UNKNOWN_BROKEN_TYPE 117 #define EVP_R_PRIVATE_KEY_DECODE_ERROR 145 #define EVP_R_PRIVATE_KEY_ENCODE_ERROR 146 #define EVP_R_PUBLIC_KEY_NOT_RSA 106 +#define EVP_R_TAG_TOO_LARGE 171 #define EVP_R_TOO_LARGE 164 #define EVP_R_UNKNOWN_CIPHER 160 #define EVP_R_UNKNOWN_DIGEST 161 diff --git a/lib/libssl/src/crypto/evp/evp_aead.c b/lib/libssl/src/crypto/evp/evp_aead.c new file mode 100644 index 00000000000..137e3dd05bf --- /dev/null +++ b/lib/libssl/src/crypto/evp/evp_aead.c @@ -0,0 +1,192 @@ +/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) + * All rights reserved. + * + * This package is an SSL implementation written + * by Eric Young (eay@cryptsoft.com). + * The implementation was written so as to conform with Netscapes SSL. + * + * This library is free for commercial and non-commercial use as long as + * the following conditions are aheared to. The following conditions + * apply to all code found in this distribution, be it the RC4, RSA, + * lhash, DES, etc., code; not just the SSL code. The SSL documentation + * included with this distribution is covered by the same copyright terms + * except that the holder is Tim Hudson (tjh@cryptsoft.com). + * + * Copyright remains Eric Young's, and as such any Copyright notices in + * the code are not to be removed. + * If this package is used in a product, Eric Young should be given attribution + * as the author of the parts of the library used. + * This can be in the form of a textual message at program startup or + * in documentation (online or textual) provided with the package. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * "This product includes cryptographic software written by + * Eric Young (eay@cryptsoft.com)" + * The word 'cryptographic' can be left out if the rouines from the library + * being used are not cryptographic related :-). + * 4. If you include any Windows specific code (or a derivative thereof) from + * the apps directory (application code) you must include an acknowledgement: + * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" + * + * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * The licence and distribution terms for any publically available version or + * derivative of this code cannot be changed. i.e. this code cannot simply be + * copied and put under another distribution licence + * [including the GNU Public Licence.] + */ + +#include +#include + +#include +#include + +#include "evp_locl.h" + +size_t EVP_AEAD_key_length(const EVP_AEAD *aead) + { + return aead->key_len; + } + +size_t EVP_AEAD_nonce_length(const EVP_AEAD *aead) + { + return aead->nonce_len; + } + +size_t EVP_AEAD_max_overhead(const EVP_AEAD *aead) + { + return aead->overhead; + } + +size_t EVP_AEAD_max_tag_len(const EVP_AEAD *aead) + { + return aead->max_tag_len; + } + +int EVP_AEAD_CTX_init(EVP_AEAD_CTX *ctx, const EVP_AEAD *aead, + const unsigned char *key, size_t key_len, + size_t tag_len, ENGINE *impl) + { + ctx->aead = aead; + if (key_len != aead->key_len) + { + EVPerr(EVP_F_EVP_AEAD_CTX_INIT,EVP_R_UNSUPPORTED_KEY_SIZE); + return 0; + } + return aead->init(ctx, key, key_len, tag_len); + } + +void EVP_AEAD_CTX_cleanup(EVP_AEAD_CTX *ctx) + { + if (ctx->aead == NULL) + return; + ctx->aead->cleanup(ctx); + ctx->aead = NULL; + } + +/* check_alias returns 0 if out points within the buffer determined by in + * and in_len and 1 otherwise. + * + * When processing, there's only an issue if out points within in[:in_len] + * and isn't equal to in. If that's the case then writing the output will + * stomp input that hasn't been read yet. + * + * This function checks for that case. */ +static int check_alias(const unsigned char *in, size_t in_len, + const unsigned char *out) + { + if (out <= in) + return 1; + if (in + in_len <= out) + return 1; + return 0; + } + +ssize_t EVP_AEAD_CTX_seal(const EVP_AEAD_CTX *ctx, + unsigned char *out, size_t max_out_len, + const unsigned char *nonce, size_t nonce_len, + const unsigned char *in, size_t in_len, + const unsigned char *ad, size_t ad_len) + { + size_t possible_out_len = in_len + ctx->aead->overhead; + ssize_t r; + + if (possible_out_len < in_len /* overflow */ || + possible_out_len > SSIZE_MAX /* return value cannot be + represented */) + { + EVPerr(EVP_F_EVP_AEAD_CTX_SEAL, EVP_R_TOO_LARGE); + goto error; + } + + if (!check_alias(in, in_len, out)) + { + EVPerr(EVP_F_EVP_AEAD_CTX_SEAL, EVP_R_OUTPUT_ALIASES_INPUT); + goto error; + } + + r = ctx->aead->seal(ctx, out, max_out_len, nonce, nonce_len, + in, in_len, ad, ad_len); + if (r >= 0) + return r; + +error: + /* In the event of an error, clear the output buffer so that a caller + * that doesn't check the return value doesn't send raw data. */ + memset(out, 0, max_out_len); + return -1; + } + +ssize_t EVP_AEAD_CTX_open(const EVP_AEAD_CTX *ctx, + unsigned char *out, size_t max_out_len, + const unsigned char *nonce, size_t nonce_len, + const unsigned char *in, size_t in_len, + const unsigned char *ad, size_t ad_len) + { + ssize_t r; + + if (in_len > SSIZE_MAX) + { + EVPerr(EVP_F_EVP_AEAD_CTX_OPEN, EVP_R_TOO_LARGE); + goto error; /* may not be able to represent return value. */ + } + + if (!check_alias(in, in_len, out)) + { + EVPerr(EVP_F_EVP_AEAD_CTX_OPEN, EVP_R_OUTPUT_ALIASES_INPUT); + goto error; + } + + r = ctx->aead->open(ctx, out, max_out_len, nonce, nonce_len, + in, in_len, ad, ad_len); + + if (r >= 0) + return r; + +error: + /* In the event of an error, clear the output buffer so that a caller + * that doesn't check the return value doesn't try and process bad + * data. */ + memset(out, 0, max_out_len); + return -1; + } diff --git a/lib/libssl/src/crypto/evp/evp_err.c b/lib/libssl/src/crypto/evp/evp_err.c index 80247319389..9391036d0fc 100644 --- a/lib/libssl/src/crypto/evp/evp_err.c +++ b/lib/libssl/src/crypto/evp/evp_err.c @@ -69,6 +69,9 @@ #define ERR_REASON(reason) ERR_PACK(ERR_LIB_EVP,0,reason) static ERR_STRING_DATA EVP_str_functs[] = { + {ERR_FUNC(EVP_F_AEAD_AES_GCM_INIT), "AEAD_AES_GCM_INIT"}, + {ERR_FUNC(EVP_F_AEAD_AES_GCM_OPEN), "AEAD_AES_GCM_OPEN"}, + {ERR_FUNC(EVP_F_AEAD_AES_GCM_SEAL), "AEAD_AES_GCM_SEAL"}, {ERR_FUNC(EVP_F_AESNI_INIT_KEY), "AESNI_INIT_KEY"}, {ERR_FUNC(EVP_F_AESNI_XTS_CIPHER), "AESNI_XTS_CIPHER"}, {ERR_FUNC(EVP_F_AES_INIT_KEY), "AES_INIT_KEY"}, @@ -83,6 +86,9 @@ static ERR_STRING_DATA EVP_str_functs[] = { {ERR_FUNC(EVP_F_DSA_PKEY2PKCS8), "DSA_PKEY2PKCS8"}, {ERR_FUNC(EVP_F_ECDSA_PKEY2PKCS8), "ECDSA_PKEY2PKCS8"}, {ERR_FUNC(EVP_F_ECKEY_PKEY2PKCS8), "ECKEY_PKEY2PKCS8"}, + {ERR_FUNC(EVP_F_EVP_AEAD_CTX_INIT), "EVP_AEAD_CTX_init"}, + {ERR_FUNC(EVP_F_EVP_AEAD_CTX_OPEN), "EVP_AEAD_CTX_open"}, + {ERR_FUNC(EVP_F_EVP_AEAD_CTX_SEAL), "EVP_AEAD_CTX_seal"}, {ERR_FUNC(EVP_F_EVP_CIPHERINIT_EX), "EVP_CipherInit_ex"}, {ERR_FUNC(EVP_F_EVP_CIPHER_CTX_COPY), "EVP_CIPHER_CTX_copy"}, {ERR_FUNC(EVP_F_EVP_CIPHER_CTX_CTRL), "EVP_CIPHER_CTX_ctrl"}, @@ -200,10 +206,12 @@ static ERR_STRING_DATA EVP_str_reasons[] = { {ERR_REASON(EVP_R_NO_VERIFY_FUNCTION_CONFIGURED), "no verify function configured"}, {ERR_REASON(EVP_R_OPERATION_NOT_SUPPORTED_FOR_THIS_KEYTYPE), "operation not supported for this keytype"}, {ERR_REASON(EVP_R_OPERATON_NOT_INITIALIZED), "operaton not initialized"}, + {ERR_REASON(EVP_R_OUTPUT_ALIASES_INPUT), "output aliases input"}, {ERR_REASON(EVP_R_PKCS8_UNKNOWN_BROKEN_TYPE), "pkcs8 unknown broken type"}, {ERR_REASON(EVP_R_PRIVATE_KEY_DECODE_ERROR), "private key decode error"}, {ERR_REASON(EVP_R_PRIVATE_KEY_ENCODE_ERROR), "private key encode error"}, {ERR_REASON(EVP_R_PUBLIC_KEY_NOT_RSA) , "public key not rsa"}, + {ERR_REASON(EVP_R_TAG_TOO_LARGE), "tag too large"}, {ERR_REASON(EVP_R_TOO_LARGE) , "too large"}, {ERR_REASON(EVP_R_UNKNOWN_CIPHER) , "unknown cipher"}, {ERR_REASON(EVP_R_UNKNOWN_DIGEST) , "unknown digest"}, diff --git a/lib/libssl/src/crypto/evp/evp_locl.h b/lib/libssl/src/crypto/evp/evp_locl.h index 673c85f8bde..6f9218eafc9 100644 --- a/lib/libssl/src/crypto/evp/evp_locl.h +++ b/lib/libssl/src/crypto/evp/evp_locl.h @@ -342,3 +342,25 @@ void evp_pkey_set_cb_translate(BN_GENCB *cb, EVP_PKEY_CTX *ctx); int PKCS5_v2_PBKDF2_keyivgen(EVP_CIPHER_CTX *ctx, const char *pass, int passlen, ASN1_TYPE *param, const EVP_CIPHER *c, const EVP_MD *md, int en_de); + +/* EVP_AEAD represents a specific AEAD algorithm. */ +struct evp_aead_st { + unsigned char key_len; + unsigned char nonce_len; + unsigned char overhead; + unsigned char max_tag_len; + + int (*init)(struct evp_aead_ctx_st*, const unsigned char *key, + size_t key_len, size_t tag_len); + void (*cleanup)(struct evp_aead_ctx_st*); + + ssize_t (*seal)(const struct evp_aead_ctx_st *ctx, unsigned char *out, + size_t max_out_len, const unsigned char *nonce, size_t nonce_len, + const unsigned char *in, size_t in_len, const unsigned char *ad, + size_t ad_len); + + ssize_t (*open)(const struct evp_aead_ctx_st *ctx, unsigned char *out, + size_t max_out_len, const unsigned char *nonce, size_t nonce_len, + const unsigned char *in, size_t in_len, const unsigned char *ad, + size_t ad_len); +};