dmake: do not set MAKEFLAGS=k

[unleashed/tickless.git] / usr / src / lib / pkcs11 / pkcs11_softtoken / common / softAESCrypt.c

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
 */

#include <pthread.h>
#include <stdlib.h>
#include <string.h>
#include <strings.h>
#include <sys/types.h>
#include <security/cryptoki.h>
#include "softSession.h"
#include "softObject.h"
#include "softCrypt.h"
#include <aes_impl.h>

/*
 * Allocate context for the active encryption or decryption operation, and
 * generate AES key schedule to speed up the operation.
 */
CK_RV
soft_aes_crypt_init_common(soft_session_t *session_p,
    CK_MECHANISM_PTR pMechanism, soft_object_t *key_p,
    boolean_t encrypt)
{
        size_t size;
        soft_aes_ctx_t *soft_aes_ctx;

        soft_aes_ctx = calloc(1, sizeof (soft_aes_ctx_t));
        if (soft_aes_ctx == NULL) {
                return (CKR_HOST_MEMORY);
        }

        soft_aes_ctx->key_sched = aes_alloc_keysched(&size, 0);

        if (soft_aes_ctx->key_sched == NULL) {
                free(soft_aes_ctx);
                return (CKR_HOST_MEMORY);
        }

        soft_aes_ctx->keysched_len = size;

        (void) pthread_mutex_lock(&session_p->session_mutex);
        if (encrypt) {
                /* Called by C_EncryptInit. */
                session_p->encrypt.context = soft_aes_ctx;
                session_p->encrypt.mech.mechanism = pMechanism->mechanism;
        } else {
                /* Called by C_DecryptInit. */
                session_p->decrypt.context = soft_aes_ctx;
                session_p->decrypt.mech.mechanism = pMechanism->mechanism;
        }
        (void) pthread_mutex_unlock(&session_p->session_mutex);

        /*
         * If this is a non-sensitive key and it does NOT have
         * a key schedule yet, then allocate one and expand it.
         * Otherwise, if it's a non-sensitive key, and it DOES have
         * a key schedule already attached to it, just copy the
         * pre-expanded schedule to the context and avoid the
         * extra key schedule expansion operation.
         */
        if (!(key_p->bool_attr_mask & SENSITIVE_BOOL_ON)) {
                if (OBJ_KEY_SCHED(key_p) == NULL) {
                        void *ks;

                        (void) pthread_mutex_lock(&key_p->object_mutex);
                        if (OBJ_KEY_SCHED(key_p) == NULL) {
                                ks = aes_alloc_keysched(&size, 0);
                                if (ks == NULL) {
                                        (void) pthread_mutex_unlock(
                                            &key_p->object_mutex);
                                        free(soft_aes_ctx);
                                        return (CKR_HOST_MEMORY);
                                }
                                aes_init_keysched(OBJ_SEC_VALUE(key_p),
                                    (OBJ_SEC_VALUE_LEN(key_p) * 8), ks);
                                OBJ_KEY_SCHED_LEN(key_p) = size;
                                OBJ_KEY_SCHED(key_p) = ks;
                        }
                        (void) pthread_mutex_unlock(&key_p->object_mutex);
                }
                (void) memcpy(soft_aes_ctx->key_sched, OBJ_KEY_SCHED(key_p),
                    OBJ_KEY_SCHED_LEN(key_p));
                soft_aes_ctx->keysched_len = OBJ_KEY_SCHED_LEN(key_p);
        } else {
                /*
                 * Initialize key schedule for AES. aes_init_keysched()
                 * requires key length in bits.
                 */
                aes_init_keysched(OBJ_SEC_VALUE(key_p),
                    (OBJ_SEC_VALUE_LEN(key_p) * 8), soft_aes_ctx->key_sched);
        }
        return (CKR_OK);
}


/*
 * soft_aes_encrypt_common()
 *
 * Arguments:
 *      session_p:      pointer to soft_session_t struct
 *      pData:          pointer to the input data to be encrypted
 *      ulDataLen:      length of the input data
 *      pEncrypted:     pointer to the output data after encryption
 *      pulEncryptedLen: pointer to the length of the output data
 *      update:         boolean flag indicates caller is soft_encrypt
 *                      or soft_encrypt_update
 *
 * Description:
 *      This function calls the corresponding encrypt routine based
 *      on the mechanism.
 *
 * Returns:
 *      CKR_OK: success
 *      CKR_BUFFER_TOO_SMALL: the output buffer provided by application
 *                            is too small
 *      CKR_FUNCTION_FAILED: encrypt function failed
 *      CKR_DATA_LEN_RANGE: the input data is not a multiple of blocksize
 */
CK_RV
soft_aes_encrypt_common(soft_session_t *session_p, CK_BYTE_PTR pData,
    CK_ULONG ulDataLen, CK_BYTE_PTR pEncrypted,
    CK_ULONG_PTR pulEncryptedLen, boolean_t update)
{

        int rc = 0;
        CK_RV rv = CKR_OK;
        soft_aes_ctx_t *soft_aes_ctx =
            (soft_aes_ctx_t *)session_p->encrypt.context;
        aes_ctx_t *aes_ctx;
        CK_MECHANISM_TYPE mechanism = session_p->encrypt.mech.mechanism;
        CK_BYTE *in_buf = NULL;
        CK_BYTE *out_buf = NULL;
        CK_ULONG out_len;
        CK_ULONG total_len;
        CK_ULONG remain;

        if (mechanism == CKM_AES_CTR)
                goto do_encryption;

        /*
         * AES only takes input length that is a multiple of blocksize
         * for C_Encrypt function with the mechanism CKM_AES_ECB or
         * CKM_AES_CBC.
         *
         * AES allows any input length for C_Encrypt function with the
         * mechanism CKM_AES_CBC_PAD and for C_EncryptUpdate function.
         */
        if ((!update) && (mechanism != CKM_AES_CBC_PAD)) {
                if ((ulDataLen % AES_BLOCK_LEN) != 0) {
                        rv = CKR_DATA_LEN_RANGE;
                        goto cleanup;
                }
        }

        if (!update) {
                /*
                 * Called by C_Encrypt
                 */
                if (mechanism == CKM_AES_CBC_PAD) {
                        /*
                         * For CKM_AES_CBC_PAD, compute output length to
                         * count for the padding. If the length of input
                         * data is a multiple of blocksize, then make output
                         * length to be the sum of the input length and
                         * one blocksize. Otherwise, output length will
                         * be rounded up to the next multiple of blocksize.
                         */
                        out_len = AES_BLOCK_LEN *
                            (ulDataLen / AES_BLOCK_LEN + 1);
                } else {
                        /*
                         * For non-padding mode, the output length will
                         * be same as the input length.
                         */
                        out_len = ulDataLen;
                }

                /*
                 * If application asks for the length of the output buffer
                 * to hold the ciphertext?
                 */
                if (pEncrypted == NULL) {
                        *pulEncryptedLen = out_len;
                        return (CKR_OK);
                }

                /* Is the application-supplied buffer large enough? */
                if (*pulEncryptedLen < out_len) {
                        *pulEncryptedLen = out_len;
                        return (CKR_BUFFER_TOO_SMALL);
                }

                /* Encrypt pad bytes in a separate operation */
                if (mechanism == CKM_AES_CBC_PAD) {
                        out_len -= AES_BLOCK_LEN;
                }

                in_buf = pData;
                out_buf = pEncrypted;
        } else {
                /*
                 * Called by C_EncryptUpdate
                 *
                 * Add the lengths of last remaining data and current
                 * plaintext together to get the total input length.
                 */
                total_len = soft_aes_ctx->remain_len + ulDataLen;

                /*
                 * If the total input length is less than one blocksize,
                 * or if the total input length is just one blocksize and
                 * the mechanism is CKM_AES_CBC_PAD, we will need to delay
                 * encryption until when more data comes in next
                 * C_EncryptUpdate or when C_EncryptFinal is called.
                 */
                if ((total_len < AES_BLOCK_LEN) ||
                    ((mechanism == CKM_AES_CBC_PAD) &&
                    (total_len == AES_BLOCK_LEN))) {
                        if (pEncrypted != NULL) {
                                /*
                                 * Save input data and its length in
                                 * the remaining buffer of AES context.
                                 */
                                (void) memcpy(soft_aes_ctx->data +
                                    soft_aes_ctx->remain_len, pData, ulDataLen);
                                soft_aes_ctx->remain_len += ulDataLen;
                        }

                        /* Set encrypted data length to 0. */
                        *pulEncryptedLen = 0;
                        return (CKR_OK);
                }

                /* Compute the length of remaing data. */
                remain = total_len % AES_BLOCK_LEN;

                /*
                 * Make sure that the output length is a multiple of
                 * blocksize.
                 */
                out_len = total_len - remain;

                /*
                 * If application asks for the length of the output buffer
                 * to hold the ciphertext?
                 */
                if (pEncrypted == NULL) {
                        *pulEncryptedLen = out_len;
                        return (CKR_OK);
                }

                /* Is the application-supplied buffer large enough? */
                if (*pulEncryptedLen < out_len) {
                        *pulEncryptedLen = out_len;
                        return (CKR_BUFFER_TOO_SMALL);
                }

                if (soft_aes_ctx->remain_len != 0) {
                        /*
                         * Copy last remaining data and current input data
                         * to the output buffer.
                         */
                        (void) memmove(pEncrypted + soft_aes_ctx->remain_len,
                            pData, out_len - soft_aes_ctx->remain_len);
                        (void) memcpy(pEncrypted, soft_aes_ctx->data,
                            soft_aes_ctx->remain_len);
                        bzero(soft_aes_ctx->data, soft_aes_ctx->remain_len);

                        in_buf = pEncrypted;
                } else {
                        in_buf = pData;
                }
                out_buf = pEncrypted;
        }

do_encryption:
        /*
         * Begin Encryption now.
         */
        switch (mechanism) {

        case CKM_AES_ECB:
        {

                ulong_t i;
                uint8_t *tmp_inbuf;
                uint8_t *tmp_outbuf;

                for (i = 0; i < out_len; i += AES_BLOCK_LEN) {
                        tmp_inbuf = &in_buf[i];
                        tmp_outbuf = &out_buf[i];
                        /* Crunch one block of data for AES. */
                        (void) aes_encrypt_block(soft_aes_ctx->key_sched,
                            tmp_inbuf, tmp_outbuf);
                }

                if (update) {
                        /*
                         * For encrypt update, if there is a remaining
                         * data, save it and its length in the context.
                         */
                        if (remain != 0)
                                (void) memcpy(soft_aes_ctx->data, pData +
                                    (ulDataLen - remain), remain);
                        soft_aes_ctx->remain_len = remain;
                }

                *pulEncryptedLen = out_len;

                break;
        }

        case CKM_AES_CBC:
        case CKM_AES_CBC_PAD:
        {
                crypto_data_t out;

                out.cd_format = CRYPTO_DATA_RAW;
                out.cd_offset = 0;
                out.cd_length = out_len;
                out.cd_raw.iov_base = (char *)out_buf;
                out.cd_raw.iov_len = out_len;

                /* Encrypt multiple blocks of data. */
                rc = aes_encrypt_contiguous_blocks(
                    (aes_ctx_t *)soft_aes_ctx->aes_cbc,
                    (char *)in_buf, out_len, &out);

                if (rc != 0)
                        goto encrypt_failed;

                if (update) {
                        /*
                         * For encrypt update, if there is remaining data,
                         * save it and its length in the context.
                         */
                        if (remain != 0)
                                (void) memcpy(soft_aes_ctx->data, pData +
                                    (ulDataLen - remain), remain);
                        soft_aes_ctx->remain_len = remain;
                } else if (mechanism == CKM_AES_CBC_PAD) {
                        /*
                         * Save the remainder of the input
                         * block in a temporary block because
                         * we dont want to overrun the buffer
                         * by tacking on pad bytes.
                         */
                        CK_BYTE tmpblock[AES_BLOCK_LEN];
                        (void) memcpy(tmpblock, in_buf + out_len,
                            ulDataLen - out_len);
                        soft_add_pkcs7_padding(tmpblock +
                            (ulDataLen - out_len),
                            AES_BLOCK_LEN, ulDataLen - out_len);

                        out.cd_offset = out_len;
                        out.cd_length = AES_BLOCK_LEN;
                        out.cd_raw.iov_base = (char *)out_buf;
                        out.cd_raw.iov_len = out_len + AES_BLOCK_LEN;

                        /* Encrypt last block containing pad bytes. */
                        rc = aes_encrypt_contiguous_blocks(
                            (aes_ctx_t *)soft_aes_ctx->aes_cbc,
                            (char *)tmpblock, AES_BLOCK_LEN, &out);

                        out_len += AES_BLOCK_LEN;
                }

                if (rc == 0) {
                        *pulEncryptedLen = out_len;
                        break;
                }
encrypt_failed:
                *pulEncryptedLen = 0;
                rv = CKR_FUNCTION_FAILED;
                goto cleanup;
        }
        case CKM_AES_CTR:
        {
                crypto_data_t out;

                out.cd_format = CRYPTO_DATA_RAW;
                out.cd_offset = 0;
                out.cd_length = *pulEncryptedLen;
                out.cd_raw.iov_base = (char *)pEncrypted;
                out.cd_raw.iov_len = *pulEncryptedLen;

                rc = aes_encrypt_contiguous_blocks(soft_aes_ctx->aes_cbc,
                    (char *)pData, ulDataLen, &out);

                if (rc != 0) {
                        *pulEncryptedLen = 0;
                        rv = CKR_FUNCTION_FAILED;
                        goto cleanup;
                }
                /*
                 * Since AES counter mode is a stream cipher, we call
                 * aes_counter_final() to pick up any remaining bytes.
                 * It is an internal function that does not destroy
                 * the context like *normal* final routines.
                 */
                if (((aes_ctx_t *)soft_aes_ctx->aes_cbc)->ac_remainder_len > 0)
                        rc = ctr_mode_final(soft_aes_ctx->aes_cbc, &out,
                            aes_encrypt_block);
        }
        } /* end switch */

        if (update)
                return (CKR_OK);

        /*
         * The following code will be executed if the caller is
         * soft_encrypt() or an error occurred. The encryption
         * operation will be terminated so we need to do some cleanup.
         */
cleanup:
        (void) pthread_mutex_lock(&session_p->session_mutex);
        aes_ctx = (aes_ctx_t *)soft_aes_ctx->aes_cbc;
        if (aes_ctx != NULL) {
                bzero(aes_ctx->ac_keysched, aes_ctx->ac_keysched_len);
                free(soft_aes_ctx->aes_cbc);
        }

        bzero(soft_aes_ctx->key_sched, soft_aes_ctx->keysched_len);
        free(soft_aes_ctx->key_sched);
        free(session_p->encrypt.context);
        session_p->encrypt.context = NULL;
        (void) pthread_mutex_unlock(&session_p->session_mutex);

        return (rv);
}


/*
 * soft_aes_decrypt_common()
 *
 * Arguments:
 *      session_p:      pointer to soft_session_t struct
 *      pEncrypted:     pointer to the input data to be decrypted
 *      ulEncryptedLen: length of the input data
 *      pData:          pointer to the output data
 *      pulDataLen:     pointer to the length of the output data
 *      Update:         boolean flag indicates caller is soft_decrypt
 *                      or soft_decrypt_update
 *
 * Description:
 *      This function calls the corresponding decrypt routine based
 *      on the mechanism.
 *
 * Returns:
 *      CKR_OK: success
 *      CKR_BUFFER_TOO_SMALL: the output buffer provided by application
 *                            is too small
 *      CKR_ENCRYPTED_DATA_LEN_RANGE: the input data is not a multiple
 *                                    of blocksize
 *      CKR_FUNCTION_FAILED: decrypt function failed
 */
CK_RV
soft_aes_decrypt_common(soft_session_t *session_p, CK_BYTE_PTR pEncrypted,
    CK_ULONG ulEncryptedLen, CK_BYTE_PTR pData,
    CK_ULONG_PTR pulDataLen, boolean_t update)
{

        int rc = 0;
        CK_RV rv = CKR_OK;
        soft_aes_ctx_t *soft_aes_ctx =
            (soft_aes_ctx_t *)session_p->decrypt.context;
        aes_ctx_t *aes_ctx;
        CK_MECHANISM_TYPE mechanism = session_p->decrypt.mech.mechanism;
        CK_BYTE *in_buf = NULL;
        CK_BYTE *out_buf = NULL;
        CK_ULONG out_len;
        CK_ULONG total_len;
        CK_ULONG remain;

        if (mechanism == CKM_AES_CTR)
                goto do_decryption;

        /*
         * AES only takes input length that is a multiple of 16 bytes
         * for C_Decrypt function with the mechanism CKM_AES_ECB,
         * CKM_AES_CBC or CKM_AES_CBC_PAD.
         *
         * AES allows any input length for C_DecryptUpdate function.
         */
        if (!update) {
                /*
                 * Called by C_Decrypt
                 */
                if ((ulEncryptedLen % AES_BLOCK_LEN) != 0) {
                        rv = CKR_ENCRYPTED_DATA_LEN_RANGE;
                        goto cleanup;
                }

                /*
                 * If application asks for the length of the output buffer
                 * to hold the plaintext?
                 */
                if (pData == NULL) {
                        *pulDataLen = ulEncryptedLen;
                        return (CKR_OK);
                }

                /* Is the application-supplied buffer large enough? */
                if (mechanism != CKM_AES_CBC_PAD) {
                        if (*pulDataLen < ulEncryptedLen) {
                                *pulDataLen = ulEncryptedLen;
                                return (CKR_BUFFER_TOO_SMALL);
                        }
                        out_len = ulEncryptedLen;
                } else {
                        /*
                         * For CKM_AES_CBC_PAD, we don't know how
                         * many bytes for padding at this time, so
                         * we'd assume one block was padded.
                         */
                        if (*pulDataLen < (ulEncryptedLen - AES_BLOCK_LEN)) {
                                *pulDataLen = ulEncryptedLen - AES_BLOCK_LEN;
                                return (CKR_BUFFER_TOO_SMALL);
                        }
                        out_len = ulEncryptedLen - AES_BLOCK_LEN;
                }
                in_buf = pEncrypted;
                out_buf = pData;
        } else {
                /*
                 *  Called by C_DecryptUpdate
                 *
                 * Add the lengths of last remaining data and current
                 * input data together to get the total input length.
                 */
                total_len = soft_aes_ctx->remain_len + ulEncryptedLen;

                /*
                 * If the total input length is less than one blocksize,
                 * or if the total input length is just one blocksize and
                 * the mechanism is CKM_AES_CBC_PAD, we will need to delay
                 * decryption until when more data comes in next
                 * C_DecryptUpdate or when C_DecryptFinal is called.
                 */
                if ((total_len < AES_BLOCK_LEN) ||
                    ((mechanism == CKM_AES_CBC_PAD) &&
                    (total_len == AES_BLOCK_LEN))) {
                        if (pData != NULL) {
                                /*
                                 * Save input data and its length in
                                 * the remaining buffer of AES context.
                                 */
                                (void) memcpy(soft_aes_ctx->data +
                                    soft_aes_ctx->remain_len,
                                    pEncrypted, ulEncryptedLen);
                                soft_aes_ctx->remain_len += ulEncryptedLen;
                        }

                        /* Set output data length to 0. */
                        *pulDataLen = 0;
                        return (CKR_OK);
                }

                /* Compute the length of remaing data. */
                remain = total_len % AES_BLOCK_LEN;

                /*
                 * Make sure that the output length is a multiple of
                 * blocksize.
                 */
                out_len = total_len - remain;

                if (mechanism == CKM_AES_CBC_PAD) {
                        /*
                         * If the input data length is a multiple of
                         * blocksize, then save the last block of input
                         * data in the remaining buffer. C_DecryptFinal
                         * will handle this last block of data.
                         */
                        if (remain == 0) {
                                remain = AES_BLOCK_LEN;
                                out_len -= AES_BLOCK_LEN;
                        }
                }

                /*
                 * If application asks for the length of the output buffer
                 * to hold the plaintext?
                 */
                if (pData == NULL) {
                        *pulDataLen = out_len;
                        return (CKR_OK);
                }

                /*
                 * Is the application-supplied buffer large enough?
                 */
                if (*pulDataLen < out_len) {
                        *pulDataLen = out_len;
                        return (CKR_BUFFER_TOO_SMALL);
                }

                if (soft_aes_ctx->remain_len != 0) {
                        /*
                         * Copy last remaining data and current input data
                         * to the output buffer.
                         */
                        (void) memmove(pData + soft_aes_ctx->remain_len,
                            pEncrypted, out_len - soft_aes_ctx->remain_len);
                        (void) memcpy(pData, soft_aes_ctx->data,
                            soft_aes_ctx->remain_len);
                        bzero(soft_aes_ctx->data, soft_aes_ctx->remain_len);

                        in_buf = pData;
                } else {
                        in_buf = pEncrypted;
                }
                out_buf = pData;
        }

do_decryption:
        /*
         * Begin Decryption.
         */
        switch (mechanism) {

        case CKM_AES_ECB:
        {

                ulong_t i;
                uint8_t *tmp_inbuf;
                uint8_t *tmp_outbuf;

                for (i = 0; i < out_len; i += AES_BLOCK_LEN) {
                        tmp_inbuf = &in_buf[i];
                        tmp_outbuf = &out_buf[i];
                        /* Crunch one block of data for AES. */
                        (void) aes_decrypt_block(soft_aes_ctx->key_sched,
                            tmp_inbuf, tmp_outbuf);
                }

                if (update) {
                        /*
                         * For decrypt update, if there is a remaining
                         * data, save it and its length in the context.
                         */
                        if (remain != 0)
                                (void) memcpy(soft_aes_ctx->data, pEncrypted +
                                    (ulEncryptedLen - remain), remain);
                        soft_aes_ctx->remain_len = remain;
                }

                *pulDataLen = out_len;

                break;
        }

        case CKM_AES_CBC:
        case CKM_AES_CBC_PAD:
        {
                crypto_data_t out;
                CK_ULONG rem_len;
                uint8_t last_block[AES_BLOCK_LEN];

                out.cd_format = CRYPTO_DATA_RAW;
                out.cd_offset = 0;
                out.cd_length = out_len;
                out.cd_raw.iov_base = (char *)out_buf;
                out.cd_raw.iov_len = out_len;

                /* Decrypt multiple blocks of data. */
                rc = aes_decrypt_contiguous_blocks(
                    (aes_ctx_t *)soft_aes_ctx->aes_cbc,
                    (char *)in_buf, out_len, &out);

                if (rc != 0)
                        goto decrypt_failed;

                if ((mechanism == CKM_AES_CBC_PAD) && (!update)) {
                        /* Decrypt last block containing pad bytes. */
                        out.cd_offset = 0;
                        out.cd_length = AES_BLOCK_LEN;
                        out.cd_raw.iov_base = (char *)last_block;
                        out.cd_raw.iov_len = AES_BLOCK_LEN;

                        /* Decrypt last block containing pad bytes. */
                        rc = aes_decrypt_contiguous_blocks(
                            (aes_ctx_t *)soft_aes_ctx->aes_cbc,
                            (char *)in_buf + out_len, AES_BLOCK_LEN, &out);

                        if (rc != 0)
                                goto decrypt_failed;

                        /*
                         * Remove padding bytes after decryption of
                         * ciphertext block to produce the original
                         * plaintext.
                         */
                        rv = soft_remove_pkcs7_padding(last_block,
                            AES_BLOCK_LEN, &rem_len);
                        if (rv == CKR_OK) {
                                if (rem_len != 0)
                                        (void) memcpy(out_buf + out_len,
                                            last_block, rem_len);
                                *pulDataLen = out_len + rem_len;
                        } else {
                                *pulDataLen = 0;
                                goto cleanup;
                        }
                } else {
                        *pulDataLen = out_len;
                }

                if (update) {
                        /*
                         * For decrypt update, if there is remaining data,
                         * save it and its length in the context.
                         */
                        if (remain != 0)
                                (void) memcpy(soft_aes_ctx->data, pEncrypted +
                                    (ulEncryptedLen - remain), remain);
                        soft_aes_ctx->remain_len = remain;
                }

                if (rc == 0)
                        break;
decrypt_failed:
                *pulDataLen = 0;
                rv = CKR_FUNCTION_FAILED;
                goto cleanup;
        }
        case CKM_AES_CTR:
        {
                crypto_data_t out;

                out.cd_format = CRYPTO_DATA_RAW;
                out.cd_offset = 0;
                out.cd_length = *pulDataLen;
                out.cd_raw.iov_base = (char *)pData;
                out.cd_raw.iov_len = *pulDataLen;

                rc = aes_decrypt_contiguous_blocks(soft_aes_ctx->aes_cbc,
                    (char *)pEncrypted, ulEncryptedLen, &out);

                if (rc != 0) {
                        *pulDataLen = 0;
                        rv = CKR_FUNCTION_FAILED;
                        goto cleanup;
                }

                /*
                 * Since AES counter mode is a stream cipher, we call
                 * aes_counter_final() to pick up any remaining bytes.
                 * It is an internal function that does not destroy
                 * the context like *normal* final routines.
                 */
                if (((aes_ctx_t *)soft_aes_ctx->aes_cbc)->ac_remainder_len
                    > 0) {
                        rc = ctr_mode_final(soft_aes_ctx->aes_cbc, &out,
                            aes_encrypt_block);
                        if (rc == CRYPTO_DATA_LEN_RANGE)
                                rc = CRYPTO_ENCRYPTED_DATA_LEN_RANGE;
                }
        }
        } /* end switch */

        if (update)
                return (CKR_OK);

        /*
         * The following code will be executed if the caller is
         * soft_decrypt() or an error occurred. The decryption
         * operation will be terminated so we need to do some cleanup.
         */
cleanup:
        (void) pthread_mutex_lock(&session_p->session_mutex);
        aes_ctx = (aes_ctx_t *)soft_aes_ctx->aes_cbc;
        if (aes_ctx != NULL) {
                bzero(aes_ctx->ac_keysched, aes_ctx->ac_keysched_len);
                free(soft_aes_ctx->aes_cbc);
        }

        bzero(soft_aes_ctx->key_sched, soft_aes_ctx->keysched_len);
        free(soft_aes_ctx->key_sched);
        free(session_p->decrypt.context);
        session_p->decrypt.context = NULL;
        (void) pthread_mutex_unlock(&session_p->session_mutex);

        return (rv);
}


/*
 * Allocate and initialize a context for AES CBC mode of operation.
 */
void *
aes_cbc_ctx_init(void *key_sched, size_t size, uint8_t *ivec)
{

        cbc_ctx_t *cbc_ctx;

        if ((cbc_ctx = calloc(1, sizeof (cbc_ctx_t))) == NULL)
                return (NULL);

        cbc_ctx->cbc_keysched = key_sched;
        cbc_ctx->cbc_keysched_len = size;

        (void) memcpy(&cbc_ctx->cbc_iv[0], ivec, AES_BLOCK_LEN);

        cbc_ctx->cbc_lastp = (uint8_t *)cbc_ctx->cbc_iv;
        cbc_ctx->cbc_flags |= CBC_MODE;

        return (cbc_ctx);
}

/*
 * Allocate and initialize a context for AES CTR mode of operation.
 */
void *
aes_ctr_ctx_init(void *key_sched, size_t size, uint8_t *param)
{

        ctr_ctx_t *ctr_ctx;
        CK_AES_CTR_PARAMS *pp;

        /* LINTED: pointer alignment */
        pp = (CK_AES_CTR_PARAMS *)param;

        if ((ctr_ctx = calloc(1, sizeof (ctr_ctx_t))) == NULL)
                return (NULL);

        ctr_ctx->ctr_keysched = key_sched;
        ctr_ctx->ctr_keysched_len = size;

        if (ctr_init_ctx(ctr_ctx, pp->ulCounterBits, pp->cb, aes_copy_block)
            != CRYPTO_SUCCESS) {
                free(ctr_ctx);
                return (NULL);
        }

        return (ctr_ctx);
}