From: Dmitry Eremin-Solenikov <[email protected]> Make AES-GCM use recently introduced aad and auth_digest_len fields.
Signed-off-by: Dmitry Eremin-Solenikov <[email protected]> --- /** Email created from pull request 24 (lumag:crypto-dal) ** https://github.com/Linaro/odp/pull/24 ** Patch: https://github.com/Linaro/odp/pull/24.patch ** Base sha: 826ee894aa0ebd09d42a17e1de077c46bc5b366a ** Merge commit sha: 78b12f0da50bf257f978a197b2667405a94a4938 **/ platform/linux-generic/odp_crypto.c | 60 ++++++++++--------------------------- 1 file changed, 16 insertions(+), 44 deletions(-) diff --git a/platform/linux-generic/odp_crypto.c b/platform/linux-generic/odp_crypto.c index 2fdcfa3f..0ca3e110 100644 --- a/platform/linux-generic/odp_crypto.c +++ b/platform/linux-generic/odp_crypto.c @@ -267,10 +267,8 @@ odp_crypto_alg_err_t aes_gcm_encrypt(odp_crypto_op_param_t *param, { uint8_t *data = odp_packet_data(param->out_pkt); uint32_t plain_len = param->cipher_range.length; - uint8_t *aad_head = data + param->auth_range.offset; - uint8_t *aad_tail = data + param->cipher_range.offset + - param->cipher_range.length; - uint32_t auth_len = param->auth_range.length; + const uint8_t *aad_head = param->aad.ptr; + uint32_t aad_len = param->aad.length; unsigned char iv_enc[AES_BLOCK_SIZE]; void *iv_ptr; uint8_t *tag = data + param->hash_result_offset; @@ -282,12 +280,6 @@ odp_crypto_alg_err_t aes_gcm_encrypt(odp_crypto_op_param_t *param, else return ODP_CRYPTO_ALG_ERR_IV_INVALID; - /* All cipher data must be part of the authentication */ - if (param->auth_range.offset > param->cipher_range.offset || - param->auth_range.offset + auth_len < - param->cipher_range.offset + plain_len) - return ODP_CRYPTO_ALG_ERR_DATA_SIZE; - /* * Create a copy of the IV. The DES library modifies IV * and if we are processing packets on parallel threads @@ -305,23 +297,16 @@ odp_crypto_alg_err_t aes_gcm_encrypt(odp_crypto_op_param_t *param, EVP_EncryptInit_ex(ctx, NULL, NULL, NULL, iv_enc); /* Authenticate header data (if any) without encrypting them */ - if (aad_head < plaindata) { + if (aad_len > 0) EVP_EncryptUpdate(ctx, NULL, &cipher_len, - aad_head, plaindata - aad_head); - } + aad_head, aad_len); EVP_EncryptUpdate(ctx, plaindata, &cipher_len, plaindata, plain_len); - cipher_len = plain_len; - - /* Authenticate footer data (if any) without encrypting them */ - if (aad_head + auth_len > plaindata + plain_len) { - EVP_EncryptUpdate(ctx, NULL, NULL, aad_tail, - auth_len - (aad_tail - aad_head)); - } EVP_EncryptFinal_ex(ctx, plaindata + cipher_len, &cipher_len); - EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_GCM_GET_TAG, 16, tag); + EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_GCM_GET_TAG, + session->p.auth_digest_len, tag); return ODP_CRYPTO_ALG_ERR_NONE; } @@ -332,10 +317,8 @@ odp_crypto_alg_err_t aes_gcm_decrypt(odp_crypto_op_param_t *param, { uint8_t *data = odp_packet_data(param->out_pkt); uint32_t cipher_len = param->cipher_range.length; - uint8_t *aad_head = data + param->auth_range.offset; - uint8_t *aad_tail = data + param->cipher_range.offset + - param->cipher_range.length; - uint32_t auth_len = param->auth_range.length; + const uint8_t *aad_head = param->aad.ptr; + uint32_t aad_len = param->aad.length; unsigned char iv_enc[AES_BLOCK_SIZE]; void *iv_ptr; uint8_t *tag = data + param->hash_result_offset; @@ -347,12 +330,6 @@ odp_crypto_alg_err_t aes_gcm_decrypt(odp_crypto_op_param_t *param, else return ODP_CRYPTO_ALG_ERR_IV_INVALID; - /* All cipher data must be part of the authentication */ - if (param->auth_range.offset > param->cipher_range.offset || - param->auth_range.offset + auth_len < - param->cipher_range.offset + cipher_len) - return ODP_CRYPTO_ALG_ERR_DATA_SIZE; - /* * Create a copy of the IV. The DES library modifies IV * and if we are processing packets on parallel threads @@ -368,25 +345,18 @@ odp_crypto_alg_err_t aes_gcm_decrypt(odp_crypto_op_param_t *param, EVP_DecryptInit_ex(ctx, NULL, NULL, NULL, iv_enc); - EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_GCM_SET_TAG, 16, tag); + EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_GCM_SET_TAG, + session->p.auth_digest_len, tag); /* Authenticate header data (if any) without encrypting them */ - if (aad_head < cipherdata) { + if (aad_len > 0) EVP_DecryptUpdate(ctx, NULL, &plain_len, - aad_head, cipherdata - aad_head); - } + aad_head, aad_len); EVP_DecryptUpdate(ctx, cipherdata, &plain_len, cipherdata, cipher_len); - plain_len = cipher_len; - - /* Authenticate footer data (if any) without encrypting them */ - if (aad_head + auth_len > cipherdata + cipher_len) { - EVP_DecryptUpdate(ctx, NULL, NULL, aad_tail, - auth_len - (aad_tail - aad_head)); - } - if (EVP_DecryptFinal_ex(ctx, cipherdata + cipher_len, &plain_len) <= 0) + if (EVP_DecryptFinal_ex(ctx, cipherdata + plain_len, &plain_len) <= 0) return ODP_CRYPTO_ALG_ERR_ICV_CHECK; return ODP_CRYPTO_ALG_ERR_NONE; @@ -768,12 +738,14 @@ odp_crypto_session_create(odp_crypto_session_param_t *param, case ODP_AUTH_ALG_AES128_GCM: if (param->cipher_alg == ODP_CIPHER_ALG_AES128_GCM) aes_gcm = 1; + session->p.auth_digest_len = 128 / 8; /* Fallthrough */ #endif case ODP_AUTH_ALG_AES_GCM: /* AES-GCM requires to do both auth and * cipher at the same time */ - if (param->cipher_alg == ODP_CIPHER_ALG_AES_GCM || aes_gcm) { + if ((param->cipher_alg == ODP_CIPHER_ALG_AES_GCM || aes_gcm) && + session->p.auth_digest_len == 128 / 8) { session->auth.func = null_crypto_routine; rc = 0; } else {
