From: Dmitry Eremin-Solenikov <dmitry.ereminsoleni...@linaro.org> Implement AES-GMAC on top of OpenSSL AES-GCM with all text going into AAD part.
Signed-off-by: Dmitry Eremin-Solenikov <dmitry.ereminsoleni...@linaro.org> --- /** Email created from pull request 288 (lumag:gmac) ** https://github.com/Linaro/odp/pull/288 ** Patch: https://github.com/Linaro/odp/pull/288.patch ** Base sha: d22c949cc466bf28de559855a1cb525740578137 ** Merge commit sha: ba7b9d98bb5dfe0cf7d7d28767c7a9c02d421d2d **/ .../linux-generic/include/odp_crypto_internal.h | 5 +- platform/linux-generic/odp_crypto.c | 149 ++++++++++++++++++++- 2 files changed, 152 insertions(+), 2 deletions(-) diff --git a/platform/linux-generic/include/odp_crypto_internal.h b/platform/linux-generic/include/odp_crypto_internal.h index 12d1720b7..21174daa4 100644 --- a/platform/linux-generic/include/odp_crypto_internal.h +++ b/platform/linux-generic/include/odp_crypto_internal.h @@ -51,7 +51,10 @@ struct odp_crypto_generic_session { uint8_t key[EVP_MAX_KEY_LENGTH]; uint32_t key_length; uint32_t bytes; - const EVP_MD *evp_md; + union { + const EVP_MD *evp_md; + const EVP_CIPHER *evp_cipher; + }; crypto_func_t func; } auth; }; diff --git a/platform/linux-generic/odp_crypto.c b/platform/linux-generic/odp_crypto.c index 3174feee0..ac0fa337b 100644 --- a/platform/linux-generic/odp_crypto.c +++ b/platform/linux-generic/odp_crypto.c @@ -38,7 +38,9 @@ * Keep sorted: first by key length, then by IV length */ static const odp_crypto_cipher_capability_t cipher_capa_null[] = { -{.key_len = 0, .iv_len = 0} }; +{.key_len = 0, .iv_len = 0}, +/* Special case for GMAC */ +{.key_len = 0, .iv_len = 12} }; static const odp_crypto_cipher_capability_t cipher_capa_des[] = { {.key_len = 24, .iv_len = 8} }; @@ -83,6 +85,9 @@ static const odp_crypto_auth_capability_t auth_capa_sha512_hmac[] = { static const odp_crypto_auth_capability_t auth_capa_aes_gcm[] = { {.digest_len = 16, .key_len = 0, .aad_len = {.min = 8, .max = 12, .inc = 4} } }; +static const odp_crypto_auth_capability_t auth_capa_aes_gmac[] = { +{.digest_len = 16, .key_len = 16, .aad_len = {.min = 0, .max = 0, .inc = 0} } }; + typedef struct odp_crypto_global_s odp_crypto_global_t; struct odp_crypto_global_s { @@ -235,6 +240,33 @@ odp_crypto_alg_err_t auth_check(odp_packet_t pkt, } static +int internal_aad(EVP_CIPHER_CTX *ctx, + odp_packet_t pkt, + const odp_crypto_packet_op_param_t *param) +{ + uint32_t offset = param->auth_range.offset; + uint32_t len = param->auth_range.length; + int dummy_len; + int ret; + + ODP_ASSERT(offset + len <= odp_packet_len(pkt)); + + while (len > 0) { + uint32_t seglen = 0; /* GCC */ + void *mapaddr = odp_packet_offset(pkt, offset, &seglen, NULL); + uint32_t maclen = len > seglen ? seglen : len; + + EVP_EncryptUpdate(ctx, NULL, &dummy_len, mapaddr, maclen); + offset += maclen; + len -= maclen; + } + + ret = EVP_EncryptFinal_ex(ctx, NULL, &dummy_len); + + return ret; +} + +static int internal_encrypt(EVP_CIPHER_CTX *ctx, odp_packet_t pkt, const odp_crypto_packet_op_param_t *param) @@ -555,6 +587,106 @@ static int process_aes_gcm_param(odp_crypto_generic_session_t *session, return 0; } +static +odp_crypto_alg_err_t aes_gmac_gen(odp_packet_t pkt, + const odp_crypto_packet_op_param_t *param, + odp_crypto_generic_session_t *session) +{ + EVP_CIPHER_CTX *ctx; + void *iv_ptr; + uint8_t block[EVP_MAX_MD_SIZE]; + int ret; + + if (param->override_iv_ptr) + iv_ptr = param->override_iv_ptr; + else if (session->p.iv.data) + iv_ptr = session->cipher.iv_data; + else + return ODP_CRYPTO_ALG_ERR_IV_INVALID; + + /* Encrypt it */ + ctx = EVP_CIPHER_CTX_new(); + EVP_EncryptInit_ex(ctx, session->auth.evp_cipher, NULL, + session->auth.key, NULL); + EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_GCM_SET_IVLEN, + session->p.iv.length, NULL); + EVP_EncryptInit_ex(ctx, NULL, NULL, NULL, iv_ptr); + EVP_CIPHER_CTX_set_padding(ctx, 0); + + ret = internal_aad(ctx, pkt, param); + + EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_GCM_GET_TAG, + session->p.auth_digest_len, block); + odp_packet_copy_from_mem(pkt, param->hash_result_offset, + session->p.auth_digest_len, block); + + EVP_CIPHER_CTX_free(ctx); + + return ret <= 0 ? ODP_CRYPTO_ALG_ERR_DATA_SIZE : + ODP_CRYPTO_ALG_ERR_NONE; +} + +static +odp_crypto_alg_err_t aes_gmac_check(odp_packet_t pkt, + const odp_crypto_packet_op_param_t *param, + odp_crypto_generic_session_t *session) +{ + EVP_CIPHER_CTX *ctx; + void *iv_ptr; + uint8_t block[EVP_MAX_MD_SIZE]; + int ret; + + if (param->override_iv_ptr) + iv_ptr = param->override_iv_ptr; + else if (session->p.iv.data) + iv_ptr = session->cipher.iv_data; + else + return ODP_CRYPTO_ALG_ERR_IV_INVALID; + + /* Decrypt it */ + ctx = EVP_CIPHER_CTX_new(); + EVP_DecryptInit_ex(ctx, session->auth.evp_cipher, NULL, + session->auth.key, NULL); + EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_GCM_SET_IVLEN, + session->p.iv.length, NULL); + EVP_DecryptInit_ex(ctx, NULL, NULL, NULL, iv_ptr); + EVP_CIPHER_CTX_set_padding(ctx, 0); + + odp_packet_copy_to_mem(pkt, param->hash_result_offset, + session->p.auth_digest_len, block); + EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_GCM_SET_TAG, + session->p.auth_digest_len, block); + + ret = internal_aad(ctx, pkt, param); + + EVP_CIPHER_CTX_free(ctx); + + return ret <= 0 ? ODP_CRYPTO_ALG_ERR_ICV_CHECK : + ODP_CRYPTO_ALG_ERR_NONE; +} + +static int process_aes_gmac_param(odp_crypto_generic_session_t *session, + const EVP_CIPHER *cipher) +{ + /* Verify Key len is valid */ + if ((uint32_t)EVP_CIPHER_key_length(cipher) != + session->p.auth_key.length) + return -1; + + memcpy(session->auth.key, session->p.auth_key.data, + session->p.auth_key.length); + + session->auth.evp_cipher = cipher; + + /* Set function */ + if (ODP_CRYPTO_OP_ENCODE == session->p.op) + session->auth.func = aes_gmac_gen; + else + session->auth.func = aes_gmac_check; + + return 0; +} + static int process_auth_param(odp_crypto_generic_session_t *session, uint32_t key_length, const EVP_MD *evp_md) @@ -600,6 +732,7 @@ int odp_crypto_capability(odp_crypto_capability_t *capa) capa->auths.bit.sha256_hmac = 1; capa->auths.bit.sha512_hmac = 1; capa->auths.bit.aes_gcm = 1; + capa->auths.bit.aes_gmac = 1; #if ODP_DEPRECATED_API capa->ciphers.bit.aes128_cbc = 1; @@ -687,6 +820,10 @@ int odp_crypto_auth_capability(odp_auth_alg_t auth, src = auth_capa_aes_gcm; num = sizeof(auth_capa_aes_gcm) / size; break; + case ODP_AUTH_ALG_AES_GMAC: + src = auth_capa_aes_gmac; + num = sizeof(auth_capa_aes_gmac) / size; + break; default: return -1; } @@ -849,6 +986,16 @@ odp_crypto_session_create(odp_crypto_session_param_t *param, rc = -1; } break; + case ODP_AUTH_ALG_AES_GMAC: + if (param->auth_key.length == 16) + rc = process_aes_gmac_param(session, EVP_aes_128_gcm()); + else if (param->auth_key.length == 24) + rc = process_aes_gmac_param(session, EVP_aes_192_gcm()); + else if (param->auth_key.length == 32) + rc = process_aes_gmac_param(session, EVP_aes_256_gcm()); + else + rc = -1; + break; default: rc = -1; }
