[thirdparty/openssl.git] / crypto / evp / evp_enc.c

/*
 * Copyright 1995-2016 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 <stdio.h>
#include <assert.h>
#include "internal/cryptlib.h"
#include <openssl/evp.h>
#include <openssl/err.h>
#include <openssl/rand.h>
#include <openssl/engine.h>
#include "internal/evp_int.h"
#include "evp_locl.h"

int EVP_CIPHER_CTX_reset(EVP_CIPHER_CTX *c)
{
    if (c == NULL)
        return 1;
    if (c->cipher != NULL) {
        if (c->cipher->cleanup && !c->cipher->cleanup(c))
            return 0;
        /* Cleanse cipher context data */
        if (c->cipher_data && c->cipher->ctx_size)
            OPENSSL_cleanse(c->cipher_data, c->cipher->ctx_size);
    }
    OPENSSL_free(c->cipher_data);
#ifndef OPENSSL_NO_ENGINE
    ENGINE_finish(c->engine);
#endif
    memset(c, 0, sizeof(*c));
    return 1;
}

EVP_CIPHER_CTX *EVP_CIPHER_CTX_new(void)
{
    return OPENSSL_zalloc(sizeof(EVP_CIPHER_CTX));
}

void EVP_CIPHER_CTX_free(EVP_CIPHER_CTX *ctx)
{
    EVP_CIPHER_CTX_reset(ctx);
    OPENSSL_free(ctx);
}

int EVP_CipherInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
                   const unsigned char *key, const unsigned char *iv, int enc)
{
    EVP_CIPHER_CTX_reset(ctx);
    return EVP_CipherInit_ex(ctx, cipher, NULL, key, iv, enc);
}

int EVP_CipherInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
                      ENGINE *impl, const unsigned char *key,
                      const unsigned char *iv, int enc)
{
    if (enc == -1)
        enc = ctx->encrypt;
    else {
        if (enc)
            enc = 1;
        ctx->encrypt = enc;
    }
#ifndef OPENSSL_NO_ENGINE
    /*
     * Whether it's nice or not, "Inits" can be used on "Final"'d contexts so
     * this context may already have an ENGINE! Try to avoid releasing the
     * previous handle, re-querying for an ENGINE, and having a
     * reinitialisation, when it may all be unnecessary.
     */
    if (ctx->engine && ctx->cipher
        && (cipher == NULL || cipher->nid == ctx->cipher->nid))
        goto skip_to_init;
#endif
    if (cipher) {
        /*
         * Ensure a context left lying around from last time is cleared (the
         * previous check attempted to avoid this if the same ENGINE and
         * EVP_CIPHER could be used).
         */
        if (ctx->cipher) {
            unsigned long flags = ctx->flags;
            EVP_CIPHER_CTX_reset(ctx);
            /* Restore encrypt and flags */
            ctx->encrypt = enc;
            ctx->flags = flags;
        }
#ifndef OPENSSL_NO_ENGINE
        if (impl) {
            if (!ENGINE_init(impl)) {
                EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
                return 0;
            }
        } else
            /* Ask if an ENGINE is reserved for this job */
            impl = ENGINE_get_cipher_engine(cipher->nid);
        if (impl) {
            /* There's an ENGINE for this job ... (apparently) */
            const EVP_CIPHER *c = ENGINE_get_cipher(impl, cipher->nid);
            if (!c) {
                /*
                 * One positive side-effect of US's export control history,
                 * is that we should at least be able to avoid using US
                 * misspellings of "initialisation"?
                 */
                EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
                return 0;
            }
            /* We'll use the ENGINE's private cipher definition */
            cipher = c;
            /*
             * Store the ENGINE functional reference so we know 'cipher' came
             * from an ENGINE and we need to release it when done.
             */
            ctx->engine = impl;
        } else
            ctx->engine = NULL;
#endif

        ctx->cipher = cipher;
        if (ctx->cipher->ctx_size) {
            ctx->cipher_data = OPENSSL_zalloc(ctx->cipher->ctx_size);
            if (ctx->cipher_data == NULL) {
                EVPerr(EVP_F_EVP_CIPHERINIT_EX, ERR_R_MALLOC_FAILURE);
                return 0;
            }
        } else {
            ctx->cipher_data = NULL;
        }
        ctx->key_len = cipher->key_len;
        /* Preserve wrap enable flag, zero everything else */
        ctx->flags &= EVP_CIPHER_CTX_FLAG_WRAP_ALLOW;
        if (ctx->cipher->flags & EVP_CIPH_CTRL_INIT) {
            if (!EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_INIT, 0, NULL)) {
                EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
                return 0;
            }
        }
    } else if (!ctx->cipher) {
        EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_NO_CIPHER_SET);
        return 0;
    }
#ifndef OPENSSL_NO_ENGINE
 skip_to_init:
#endif
    /* we assume block size is a power of 2 in *cryptUpdate */
    OPENSSL_assert(ctx->cipher->block_size == 1
                   || ctx->cipher->block_size == 8
                   || ctx->cipher->block_size == 16);

    if (!(ctx->flags & EVP_CIPHER_CTX_FLAG_WRAP_ALLOW)
        && EVP_CIPHER_CTX_mode(ctx) == EVP_CIPH_WRAP_MODE) {
        EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_WRAP_MODE_NOT_ALLOWED);
        return 0;
    }

    if (!(EVP_CIPHER_flags(EVP_CIPHER_CTX_cipher(ctx)) & EVP_CIPH_CUSTOM_IV)) {
        switch (EVP_CIPHER_CTX_mode(ctx)) {

        case EVP_CIPH_STREAM_CIPHER:
        case EVP_CIPH_ECB_MODE:
            break;

        case EVP_CIPH_CFB_MODE:
        case EVP_CIPH_OFB_MODE:

            ctx->num = 0;
            /* fall-through */

        case EVP_CIPH_CBC_MODE:

            OPENSSL_assert(EVP_CIPHER_CTX_iv_length(ctx) <=
                           (int)sizeof(ctx->iv));
            if (iv)
                memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx));
            memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx));
            break;

        case EVP_CIPH_CTR_MODE:
            ctx->num = 0;
            /* Don't reuse IV for CTR mode */
            if (iv)
                memcpy(ctx->iv, iv, EVP_CIPHER_CTX_iv_length(ctx));
            break;

        default:
            return 0;
        }
    }

    if (key || (ctx->cipher->flags & EVP_CIPH_ALWAYS_CALL_INIT)) {
        if (!ctx->cipher->init(ctx, key, iv, enc))
            return 0;
    }
    ctx->buf_len = 0;
    ctx->final_used = 0;
    ctx->block_mask = ctx->cipher->block_size - 1;
    return 1;
}

int EVP_CipherUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
                     const unsigned char *in, int inl)
{
    if (ctx->encrypt)
        return EVP_EncryptUpdate(ctx, out, outl, in, inl);
    else
        return EVP_DecryptUpdate(ctx, out, outl, in, inl);
}

int EVP_CipherFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
{
    if (ctx->encrypt)
        return EVP_EncryptFinal_ex(ctx, out, outl);
    else
        return EVP_DecryptFinal_ex(ctx, out, outl);
}

int EVP_CipherFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
{
    if (ctx->encrypt)
        return EVP_EncryptFinal(ctx, out, outl);
    else
        return EVP_DecryptFinal(ctx, out, outl);
}

int EVP_EncryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
                    const unsigned char *key, const unsigned char *iv)
{
    return EVP_CipherInit(ctx, cipher, key, iv, 1);
}

int EVP_EncryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
                       ENGINE *impl, const unsigned char *key,
                       const unsigned char *iv)
{
    return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 1);
}

int EVP_DecryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
                    const unsigned char *key, const unsigned char *iv)
{
    return EVP_CipherInit(ctx, cipher, key, iv, 0);
}

int EVP_DecryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
                       ENGINE *impl, const unsigned char *key,
                       const unsigned char *iv)
{
    return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 0);
}

/*
 * According to the letter of standard difference between pointers
 * is specified to be valid only within same object. This makes
 * it formally challenging to determine if input and output buffers
 * are not partially overlapping with standard pointer arithmetic.
 */
#ifdef PTRDIFF_T
# undef PTRDIFF_T
#endif
#if defined(OPENSSL_SYS_VMS) && __INITIAL_POINTER_SIZE==64
/*
 * Then we have VMS that distinguishes itself by adhering to
 * sizeof(size_t)==4 even in 64-bit builds, which means that
 * difference between two pointers might be truncated to 32 bits.
 * In the context one can even wonder how comparison for
 * equality is implemented. To be on the safe side we adhere to
 * PTRDIFF_T even for comparison for equality.
 */
# define PTRDIFF_T uint64_t
#else
# define PTRDIFF_T size_t
#endif

int is_partially_overlapping(const void *ptr1, const void *ptr2, int len)
{
    PTRDIFF_T diff = (PTRDIFF_T)ptr1-(PTRDIFF_T)ptr2;
    /*
     * Check for partially overlapping buffers. [Binary logical
     * operations are used instead of boolean to minimize number
     * of conditional branches.]
     */
    int overlapped = (len > 0) & (diff != 0) & ((diff < (PTRDIFF_T)len) |
                                                (diff > (0 - (PTRDIFF_T)len)));

    return overlapped;
}

int EVP_EncryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
                      const unsigned char *in, int inl)
{
    int i, j, bl;

    bl = ctx->cipher->block_size;

    if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
        /* If block size > 1 then the cipher will have to do this check */
        if (bl == 1 && is_partially_overlapping(out, in, inl)) {
            EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING);
            return 0;
        }

        i = ctx->cipher->do_cipher(ctx, out, in, inl);
        if (i < 0)
            return 0;
        else
            *outl = i;
        return 1;
    }

    if (inl <= 0) {
        *outl = 0;
        return inl == 0;
    }
    if (is_partially_overlapping(out + ctx->buf_len, in, inl)) {
        EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING);
        return 0;
    }

    if (ctx->buf_len == 0 && (inl & (ctx->block_mask)) == 0) {
        if (ctx->cipher->do_cipher(ctx, out, in, inl)) {
            *outl = inl;
            return 1;
        } else {
            *outl = 0;
            return 0;
        }
    }
    i = ctx->buf_len;
    OPENSSL_assert(bl <= (int)sizeof(ctx->buf));
    if (i != 0) {
        if (bl - i > inl) {
            memcpy(&(ctx->buf[i]), in, inl);
            ctx->buf_len += inl;
            *outl = 0;
            return 1;
        } else {
            j = bl - i;
            memcpy(&(ctx->buf[i]), in, j);
            inl -= j;
            in += j;
            if (!ctx->cipher->do_cipher(ctx, out, ctx->buf, bl))
                return 0;
            out += bl;
            *outl = bl;
        }
    } else
        *outl = 0;
    i = inl & (bl - 1);
    inl -= i;
    if (inl > 0) {
        if (!ctx->cipher->do_cipher(ctx, out, in, inl))
            return 0;
        *outl += inl;
    }

    if (i != 0)
        memcpy(ctx->buf, &(in[inl]), i);
    ctx->buf_len = i;
    return 1;
}

int EVP_EncryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
{
    int ret;
    ret = EVP_EncryptFinal_ex(ctx, out, outl);
    return ret;
}

int EVP_EncryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
{
    int n, ret;
    unsigned int i, b, bl;

    if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
        ret = ctx->cipher->do_cipher(ctx, out, NULL, 0);
        if (ret < 0)
            return 0;
        else
            *outl = ret;
        return 1;
    }

    b = ctx->cipher->block_size;
    OPENSSL_assert(b <= sizeof ctx->buf);
    if (b == 1) {
        *outl = 0;
        return 1;
    }
    bl = ctx->buf_len;
    if (ctx->flags & EVP_CIPH_NO_PADDING) {
        if (bl) {
            EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX,
                   EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
            return 0;
        }
        *outl = 0;
        return 1;
    }

    n = b - bl;
    for (i = bl; i < b; i++)
        ctx->buf[i] = n;
    ret = ctx->cipher->do_cipher(ctx, out, ctx->buf, b);

    if (ret)
        *outl = b;

    return ret;
}

int EVP_DecryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl,
                      const unsigned char *in, int inl)
{
    int fix_len;
    unsigned int b;

    b = ctx->cipher->block_size;

    if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
        if (b == 1 && is_partially_overlapping(out, in, inl)) {
            EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING);
            return 0;
        }

        fix_len = ctx->cipher->do_cipher(ctx, out, in, inl);
        if (fix_len < 0) {
            *outl = 0;
            return 0;
        } else
            *outl = fix_len;
        return 1;
    }

    if (inl <= 0) {
        *outl = 0;
        return inl == 0;
    }

    if (ctx->flags & EVP_CIPH_NO_PADDING)
        return EVP_EncryptUpdate(ctx, out, outl, in, inl);

    OPENSSL_assert(b <= sizeof ctx->final);

    if (ctx->final_used) {
        /* see comment about PTRDIFF_T comparison above */
        if (((PTRDIFF_T)out == (PTRDIFF_T)in)
            || is_partially_overlapping(out, in, b)) {
            EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING);
            return 0;
        }
        memcpy(out, ctx->final, b);
        out += b;
        fix_len = 1;
    } else
        fix_len = 0;

    if (!EVP_EncryptUpdate(ctx, out, outl, in, inl))
        return 0;

    /*
     * if we have 'decrypted' a multiple of block size, make sure we have a
     * copy of this last block
     */
    if (b > 1 && !ctx->buf_len) {
        *outl -= b;
        ctx->final_used = 1;
        memcpy(ctx->final, &out[*outl], b);
    } else
        ctx->final_used = 0;

    if (fix_len)
        *outl += b;

    return 1;
}

int EVP_DecryptFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
{
    int ret;
    ret = EVP_DecryptFinal_ex(ctx, out, outl);
    return ret;
}

int EVP_DecryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl)
{
    int i, n;
    unsigned int b;
    *outl = 0;

    if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
        i = ctx->cipher->do_cipher(ctx, out, NULL, 0);
        if (i < 0)
            return 0;
        else
            *outl = i;
        return 1;
    }

    b = ctx->cipher->block_size;
    if (ctx->flags & EVP_CIPH_NO_PADDING) {
        if (ctx->buf_len) {
            EVPerr(EVP_F_EVP_DECRYPTFINAL_EX,
                   EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
            return 0;
        }
        *outl = 0;
        return 1;
    }
    if (b > 1) {
        if (ctx->buf_len || !ctx->final_used) {
            EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_WRONG_FINAL_BLOCK_LENGTH);
            return (0);
        }
        OPENSSL_assert(b <= sizeof ctx->final);

        /*
         * The following assumes that the ciphertext has been authenticated.
         * Otherwise it provides a padding oracle.
         */
        n = ctx->final[b - 1];
        if (n == 0 || n > (int)b) {
            EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_BAD_DECRYPT);
            return (0);
        }
        for (i = 0; i < n; i++) {
            if (ctx->final[--b] != n) {
                EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_BAD_DECRYPT);
                return (0);
            }
        }
        n = ctx->cipher->block_size - n;
        for (i = 0; i < n; i++)
            out[i] = ctx->final[i];
        *outl = n;
    } else
        *outl = 0;
    return (1);
}

int EVP_CIPHER_CTX_set_key_length(EVP_CIPHER_CTX *c, int keylen)
{
    if (c->cipher->flags & EVP_CIPH_CUSTOM_KEY_LENGTH)
        return EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_KEY_LENGTH, keylen, NULL);
    if (c->key_len == keylen)
        return 1;
    if ((keylen > 0) && (c->cipher->flags & EVP_CIPH_VARIABLE_LENGTH)) {
        c->key_len = keylen;
        return 1;
    }
    EVPerr(EVP_F_EVP_CIPHER_CTX_SET_KEY_LENGTH, EVP_R_INVALID_KEY_LENGTH);
    return 0;
}

int EVP_CIPHER_CTX_set_padding(EVP_CIPHER_CTX *ctx, int pad)
{
    if (pad)
        ctx->flags &= ~EVP_CIPH_NO_PADDING;
    else
        ctx->flags |= EVP_CIPH_NO_PADDING;
    return 1;
}

int EVP_CIPHER_CTX_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr)
{
    int ret;
    if (!ctx->cipher) {
        EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_NO_CIPHER_SET);
        return 0;
    }

    if (!ctx->cipher->ctrl) {
        EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_NOT_IMPLEMENTED);
        return 0;
    }

    ret = ctx->cipher->ctrl(ctx, type, arg, ptr);
    if (ret == -1) {
        EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL,
               EVP_R_CTRL_OPERATION_NOT_IMPLEMENTED);
        return 0;
    }
    return ret;
}

int EVP_CIPHER_CTX_rand_key(EVP_CIPHER_CTX *ctx, unsigned char *key)
{
    if (ctx->cipher->flags & EVP_CIPH_RAND_KEY)
        return EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_RAND_KEY, 0, key);
    if (RAND_bytes(key, ctx->key_len) <= 0)
        return 0;
    return 1;
}

int EVP_CIPHER_CTX_copy(EVP_CIPHER_CTX *out, const EVP_CIPHER_CTX *in)
{
    if ((in == NULL) || (in->cipher == NULL)) {
        EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_INPUT_NOT_INITIALIZED);
        return 0;
    }
#ifndef OPENSSL_NO_ENGINE
    /* Make sure it's safe to copy a cipher context using an ENGINE */
    if (in->engine && !ENGINE_init(in->engine)) {
        EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, ERR_R_ENGINE_LIB);
        return 0;
    }
#endif

    EVP_CIPHER_CTX_reset(out);
    memcpy(out, in, sizeof(*out));

    if (in->cipher_data && in->cipher->ctx_size) {
        out->cipher_data = OPENSSL_malloc(in->cipher->ctx_size);
        if (out->cipher_data == NULL) {
            EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, ERR_R_MALLOC_FAILURE);
            return 0;
        }
        memcpy(out->cipher_data, in->cipher_data, in->cipher->ctx_size);
    }

    if (in->cipher->flags & EVP_CIPH_CUSTOM_COPY)
        return in->cipher->ctrl((EVP_CIPHER_CTX *)in, EVP_CTRL_COPY, 0, out);
    return 1;
}
Commit	Line	Data
62867571 RS	1	/*
62867571 RS	2	* Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
d02b48c6	3	*
62867571 RS	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
d02b48c6 RE	8	*/
	9
	10	#include <stdio.h>
c3a73daf	11	#include <assert.h>
b39fc560	12	#include "internal/cryptlib.h"
ec577822	13	#include <openssl/evp.h>
7f060601	14	#include <openssl/err.h>
3a87a9b9	15	#include <openssl/rand.h>
3c27208f	16	#include <openssl/engine.h>
135727ab	17	#include "internal/evp_int.h"
57ae2e24	18	#include "evp_locl.h"
d02b48c6	19
8baf9968	20	int EVP_CIPHER_CTX_reset(EVP_CIPHER_CTX *c)
0f113f3e	21	{
8baf9968 RL	22	if (c == NULL)
	23	return 1;
	24	if (c->cipher != NULL) {
	25	if (c->cipher->cleanup && !c->cipher->cleanup(c))
	26	return 0;
	27	/* Cleanse cipher context data */
	28	if (c->cipher_data && c->cipher->ctx_size)
	29	OPENSSL_cleanse(c->cipher_data, c->cipher->ctx_size);
	30	}
	31	OPENSSL_free(c->cipher_data);
	32	#ifndef OPENSSL_NO_ENGINE
7c96dbcd	33	ENGINE_finish(c->engine);
8baf9968 RL	34	#endif
	35	memset(c, 0, sizeof(*c));
	36	return 1;
0f113f3e	37	}
d02b48c6	38
b40228a6	39	EVP_CIPHER_CTX *EVP_CIPHER_CTX_new(void)
0f113f3e	40	{
8baf9968 RL	41	return OPENSSL_zalloc(sizeof(EVP_CIPHER_CTX));
	42	}
	43
	44	void EVP_CIPHER_CTX_free(EVP_CIPHER_CTX *ctx)
	45	{
	46	EVP_CIPHER_CTX_reset(ctx);
	47	OPENSSL_free(ctx);
0f113f3e	48	}
581f1c84	49
360370d9	50	int EVP_CipherInit(EVP_CIPHER_CTX ctx, const EVP_CIPHER cipher,
0f113f3e MC	51	const unsigned char key, const unsigned char iv, int enc)
0f113f3e MC	52	{
c0ca39bd	53	EVP_CIPHER_CTX_reset(ctx);
0f113f3e MC	54	return EVP_CipherInit_ex(ctx, cipher, NULL, key, iv, enc);
	55	}
	56
	57	int EVP_CipherInit_ex(EVP_CIPHER_CTX ctx, const EVP_CIPHER cipher,
	58	ENGINE impl, const unsigned char key,
	59	const unsigned char *iv, int enc)
	60	{
	61	if (enc == -1)
	62	enc = ctx->encrypt;
	63	else {
	64	if (enc)
	65	enc = 1;
	66	ctx->encrypt = enc;
	67	}
0b13e9f0	68	#ifndef OPENSSL_NO_ENGINE
0f113f3e MC	69	/*
	70	* Whether it's nice or not, "Inits" can be used on "Final"'d contexts so
	71	* this context may already have an ENGINE! Try to avoid releasing the
	72	* previous handle, re-querying for an ENGINE, and having a
0d4fb843	73	* reinitialisation, when it may all be unnecessary.
0f113f3e	74	*/
f6b94279	75	if (ctx->engine && ctx->cipher
a7f9e0a4	76	&& (cipher == NULL \|\| cipher->nid == ctx->cipher->nid))
0f113f3e	77	goto skip_to_init;
0b13e9f0	78	#endif
0f113f3e MC	79	if (cipher) {
	80	/*
	81	* Ensure a context left lying around from last time is cleared (the
	82	* previous check attempted to avoid this if the same ENGINE and
	83	* EVP_CIPHER could be used).
	84	*/
	85	if (ctx->cipher) {
	86	unsigned long flags = ctx->flags;
c0ca39bd	87	EVP_CIPHER_CTX_reset(ctx);
0f113f3e MC	88	/* Restore encrypt and flags */
	89	ctx->encrypt = enc;
	90	ctx->flags = flags;
	91	}
0b13e9f0	92	#ifndef OPENSSL_NO_ENGINE
0f113f3e MC	93	if (impl) {
	94	if (!ENGINE_init(impl)) {
	95	EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
	96	return 0;
	97	}
	98	} else
	99	/* Ask if an ENGINE is reserved for this job */
	100	impl = ENGINE_get_cipher_engine(cipher->nid);
	101	if (impl) {
	102	/* There's an ENGINE for this job ... (apparently) */
	103	const EVP_CIPHER *c = ENGINE_get_cipher(impl, cipher->nid);
	104	if (!c) {
	105	/*
	106	* One positive side-effect of US's export control history,
	107	* is that we should at least be able to avoid using US
0d4fb843	108	* misspellings of "initialisation"?
0f113f3e MC	109	*/
	110	EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
	111	return 0;
	112	}
	113	/* We'll use the ENGINE's private cipher definition */
	114	cipher = c;
	115	/*
	116	* Store the ENGINE functional reference so we know 'cipher' came
	117	* from an ENGINE and we need to release it when done.
	118	*/
	119	ctx->engine = impl;
	120	} else
	121	ctx->engine = NULL;
0b13e9f0	122	#endif
544a2aea	123
0f113f3e MC	124	ctx->cipher = cipher;
0f113f3e MC	125	if (ctx->cipher->ctx_size) {
b51bce94	126	ctx->cipher_data = OPENSSL_zalloc(ctx->cipher->ctx_size);
90945fa3	127	if (ctx->cipher_data == NULL) {
0f113f3e MC	128	EVPerr(EVP_F_EVP_CIPHERINIT_EX, ERR_R_MALLOC_FAILURE);
	129	return 0;
	130	}
	131	} else {
	132	ctx->cipher_data = NULL;
	133	}
	134	ctx->key_len = cipher->key_len;
	135	/* Preserve wrap enable flag, zero everything else */
	136	ctx->flags &= EVP_CIPHER_CTX_FLAG_WRAP_ALLOW;
	137	if (ctx->cipher->flags & EVP_CIPH_CTRL_INIT) {
	138	if (!EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_INIT, 0, NULL)) {
	139	EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_INITIALIZATION_ERROR);
	140	return 0;
	141	}
	142	}
	143	} else if (!ctx->cipher) {
	144	EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_NO_CIPHER_SET);
	145	return 0;
	146	}
0b13e9f0	147	#ifndef OPENSSL_NO_ENGINE
0f113f3e	148	skip_to_init:
0b13e9f0	149	#endif
0f113f3e MC	150	/* we assume block size is a power of 2 in cryptUpdate /
	151	OPENSSL_assert(ctx->cipher->block_size == 1
	152	\|\| ctx->cipher->block_size == 8
	153	\|\| ctx->cipher->block_size == 16);
	154
	155	if (!(ctx->flags & EVP_CIPHER_CTX_FLAG_WRAP_ALLOW)
	156	&& EVP_CIPHER_CTX_mode(ctx) == EVP_CIPH_WRAP_MODE) {
	157	EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_WRAP_MODE_NOT_ALLOWED);
	158	return 0;
	159	}
	160
480d3323	161	if (!(EVP_CIPHER_flags(EVP_CIPHER_CTX_cipher(ctx)) & EVP_CIPH_CUSTOM_IV)) {
0f113f3e MC	162	switch (EVP_CIPHER_CTX_mode(ctx)) {
	163
	164	case EVP_CIPH_STREAM_CIPHER:
	165	case EVP_CIPH_ECB_MODE:
	166	break;
	167
	168	case EVP_CIPH_CFB_MODE:
	169	case EVP_CIPH_OFB_MODE:
	170
	171	ctx->num = 0;
	172	/* fall-through */
	173
	174	case EVP_CIPH_CBC_MODE:
	175
	176	OPENSSL_assert(EVP_CIPHER_CTX_iv_length(ctx) <=
	177	(int)sizeof(ctx->iv));
	178	if (iv)
	179	memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx));
	180	memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx));
	181	break;
	182
	183	case EVP_CIPH_CTR_MODE:
	184	ctx->num = 0;
	185	/* Don't reuse IV for CTR mode */
	186	if (iv)
	187	memcpy(ctx->iv, iv, EVP_CIPHER_CTX_iv_length(ctx));
	188	break;
	189
	190	default:
	191	return 0;
0f113f3e MC	192	}
	193	}
	194
	195	if (key \|\| (ctx->cipher->flags & EVP_CIPH_ALWAYS_CALL_INIT)) {
	196	if (!ctx->cipher->init(ctx, key, iv, enc))
	197	return 0;
	198	}
	199	ctx->buf_len = 0;
	200	ctx->final_used = 0;
	201	ctx->block_mask = ctx->cipher->block_size - 1;
	202	return 1;
	203	}
d02b48c6	204
be06a934	205	int EVP_CipherUpdate(EVP_CIPHER_CTX ctx, unsigned char out, int *outl,
0f113f3e MC	206	const unsigned char *in, int inl)
	207	{
	208	if (ctx->encrypt)
	209	return EVP_EncryptUpdate(ctx, out, outl, in, inl);
	210	else
	211	return EVP_DecryptUpdate(ctx, out, outl, in, inl);
	212	}
d02b48c6	213
581f1c84	214	int EVP_CipherFinal_ex(EVP_CIPHER_CTX ctx, unsigned char out, int *outl)
0f113f3e MC	215	{
	216	if (ctx->encrypt)
	217	return EVP_EncryptFinal_ex(ctx, out, outl);
	218	else
	219	return EVP_DecryptFinal_ex(ctx, out, outl);
	220	}
581f1c84	221
6b691a5c	222	int EVP_CipherFinal(EVP_CIPHER_CTX ctx, unsigned char out, int *outl)
0f113f3e MC	223	{
	224	if (ctx->encrypt)
	225	return EVP_EncryptFinal(ctx, out, outl);
	226	else
	227	return EVP_DecryptFinal(ctx, out, outl);
	228	}
d02b48c6	229
be06a934	230	int EVP_EncryptInit(EVP_CIPHER_CTX ctx, const EVP_CIPHER cipher,
0f113f3e MC	231	const unsigned char key, const unsigned char iv)
	232	{
	233	return EVP_CipherInit(ctx, cipher, key, iv, 1);
	234	}
18eda732	235
0f113f3e MC	236	int EVP_EncryptInit_ex(EVP_CIPHER_CTX ctx, const EVP_CIPHER cipher,
	237	ENGINE impl, const unsigned char key,
	238	const unsigned char *iv)
	239	{
	240	return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 1);
	241	}
d02b48c6	242
be06a934	243	int EVP_DecryptInit(EVP_CIPHER_CTX ctx, const EVP_CIPHER cipher,
0f113f3e MC	244	const unsigned char key, const unsigned char iv)
	245	{
	246	return EVP_CipherInit(ctx, cipher, key, iv, 0);
	247	}
18eda732	248
0f113f3e MC	249	int EVP_DecryptInit_ex(EVP_CIPHER_CTX ctx, const EVP_CIPHER cipher,
	250	ENGINE impl, const unsigned char key,
	251	const unsigned char *iv)
	252	{
	253	return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 0);
	254	}
d02b48c6	255
c3a73daf AP	256	/*
	257	* According to the letter of standard difference between pointers
	258	* is specified to be valid only within same object. This makes
	259	* it formally challenging to determine if input and output buffers
	260	* are not partially overlapping with standard pointer arithmetic.
	261	*/
	262	#ifdef PTRDIFF_T
	263	# undef PTRDIFF_T
	264	#endif
	265	#if defined(OPENSSL_SYS_VMS) && __INITIAL_POINTER_SIZE==64
	266	/*
	267	* Then we have VMS that distinguishes itself by adhering to
5fc77684 AP	268	* sizeof(size_t)==4 even in 64-bit builds, which means that
	269	* difference between two pointers might be truncated to 32 bits.
	270	* In the context one can even wonder how comparison for
	271	* equality is implemented. To be on the safe side we adhere to
	272	* PTRDIFF_T even for comparison for equality.
c3a73daf AP	273	*/
	274	# define PTRDIFF_T uint64_t
	275	#else
	276	# define PTRDIFF_T size_t
	277	#endif
	278
7141ba31	279	int is_partially_overlapping(const void ptr1, const void ptr2, int len)
c3a73daf AP	280	{
	281	PTRDIFF_T diff = (PTRDIFF_T)ptr1-(PTRDIFF_T)ptr2;
	282	/*
	283	* Check for partially overlapping buffers. [Binary logical
	284	* operations are used instead of boolean to minimize number
	285	* of conditional branches.]
	286	*/
83151b73 AP	287	int overlapped = (len > 0) & (diff != 0) & ((diff < (PTRDIFF_T)len) \|
83151b73 AP	288	(diff > (0 - (PTRDIFF_T)len)));
b153f092	289
83151b73	290	return overlapped;
c3a73daf AP	291	}
c3a73daf AP	292
be06a934	293	int EVP_EncryptUpdate(EVP_CIPHER_CTX ctx, unsigned char out, int *outl,
0f113f3e MC	294	const unsigned char *in, int inl)
	295	{
	296	int i, j, bl;
	297
7141ba31 MC	298	bl = ctx->cipher->block_size;
7141ba31 MC	299
0f113f3e	300	if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
7141ba31 MC	301	/* If block size > 1 then the cipher will have to do this check */
7141ba31 MC	302	if (bl == 1 && is_partially_overlapping(out, in, inl)) {
83151b73	303	EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING);
5fc77684	304	return 0;
83151b73	305	}
5fc77684	306
0f113f3e MC	307	i = ctx->cipher->do_cipher(ctx, out, in, inl);
	308	if (i < 0)
	309	return 0;
	310	else
	311	*outl = i;
	312	return 1;
	313	}
	314
	315	if (inl <= 0) {
	316	*outl = 0;
	317	return inl == 0;
	318	}
7141ba31	319	if (is_partially_overlapping(out + ctx->buf_len, in, inl)) {
83151b73	320	EVPerr(EVP_F_EVP_ENCRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING);
5fc77684	321	return 0;
83151b73	322	}
0f113f3e MC	323
	324	if (ctx->buf_len == 0 && (inl & (ctx->block_mask)) == 0) {
	325	if (ctx->cipher->do_cipher(ctx, out, in, inl)) {
	326	*outl = inl;
	327	return 1;
	328	} else {
	329	*outl = 0;
	330	return 0;
	331	}
	332	}
	333	i = ctx->buf_len;
0f113f3e MC	334	OPENSSL_assert(bl <= (int)sizeof(ctx->buf));
0f113f3e MC	335	if (i != 0) {
3f358213	336	if (bl - i > inl) {
0f113f3e MC	337	memcpy(&(ctx->buf[i]), in, inl);
	338	ctx->buf_len += inl;
	339	*outl = 0;
	340	return 1;
	341	} else {
	342	j = bl - i;
	343	memcpy(&(ctx->buf[i]), in, j);
0f113f3e MC	344	inl -= j;
0f113f3e MC	345	in += j;
5fc77684 AP	346	if (!ctx->cipher->do_cipher(ctx, out, ctx->buf, bl))
5fc77684 AP	347	return 0;
0f113f3e MC	348	out += bl;
	349	*outl = bl;
	350	}
	351	} else
	352	*outl = 0;
	353	i = inl & (bl - 1);
	354	inl -= i;
	355	if (inl > 0) {
	356	if (!ctx->cipher->do_cipher(ctx, out, in, inl))
	357	return 0;
	358	*outl += inl;
	359	}
	360
	361	if (i != 0)
	362	memcpy(ctx->buf, &(in[inl]), i);
	363	ctx->buf_len = i;
	364	return 1;
	365	}
d02b48c6	366
be06a934	367	int EVP_EncryptFinal(EVP_CIPHER_CTX ctx, unsigned char out, int *outl)
0f113f3e MC	368	{
	369	int ret;
	370	ret = EVP_EncryptFinal_ex(ctx, out, outl);
	371	return ret;
	372	}
581f1c84 DSH	373
581f1c84 DSH	374	int EVP_EncryptFinal_ex(EVP_CIPHER_CTX ctx, unsigned char out, int *outl)
0f113f3e MC	375	{
	376	int n, ret;
	377	unsigned int i, b, bl;
	378
	379	if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
	380	ret = ctx->cipher->do_cipher(ctx, out, NULL, 0);
	381	if (ret < 0)
	382	return 0;
	383	else
	384	*outl = ret;
	385	return 1;
	386	}
	387
	388	b = ctx->cipher->block_size;
	389	OPENSSL_assert(b <= sizeof ctx->buf);
	390	if (b == 1) {
	391	*outl = 0;
	392	return 1;
	393	}
	394	bl = ctx->buf_len;
	395	if (ctx->flags & EVP_CIPH_NO_PADDING) {
	396	if (bl) {
	397	EVPerr(EVP_F_EVP_ENCRYPTFINAL_EX,
	398	EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
	399	return 0;
	400	}
	401	*outl = 0;
	402	return 1;
	403	}
	404
	405	n = b - bl;
	406	for (i = bl; i < b; i++)
	407	ctx->buf[i] = n;
	408	ret = ctx->cipher->do_cipher(ctx, out, ctx->buf, b);
	409
	410	if (ret)
	411	*outl = b;
	412
	413	return ret;
	414	}
d02b48c6	415
be06a934	416	int EVP_DecryptUpdate(EVP_CIPHER_CTX ctx, unsigned char out, int *outl,
0f113f3e MC	417	const unsigned char *in, int inl)
	418	{
	419	int fix_len;
	420	unsigned int b;
	421
7141ba31 MC	422	b = ctx->cipher->block_size;
7141ba31 MC	423
0f113f3e	424	if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
7141ba31	425	if (b == 1 && is_partially_overlapping(out, in, inl)) {
83151b73	426	EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING);
5fc77684	427	return 0;
83151b73	428	}
5fc77684	429
0f113f3e MC	430	fix_len = ctx->cipher->do_cipher(ctx, out, in, inl);
	431	if (fix_len < 0) {
	432	*outl = 0;
	433	return 0;
	434	} else
	435	*outl = fix_len;
	436	return 1;
	437	}
	438
	439	if (inl <= 0) {
	440	*outl = 0;
	441	return inl == 0;
	442	}
	443
	444	if (ctx->flags & EVP_CIPH_NO_PADDING)
	445	return EVP_EncryptUpdate(ctx, out, outl, in, inl);
	446
0f113f3e MC	447	OPENSSL_assert(b <= sizeof ctx->final);
	448
	449	if (ctx->final_used) {
5fc77684 AP	450	/* see comment about PTRDIFF_T comparison above */
5fc77684 AP	451	if (((PTRDIFF_T)out == (PTRDIFF_T)in)
83151b73 AP	452	\|\| is_partially_overlapping(out, in, b)) {
83151b73 AP	453	EVPerr(EVP_F_EVP_DECRYPTUPDATE, EVP_R_PARTIALLY_OVERLAPPING);
5fc77684	454	return 0;
83151b73	455	}
0f113f3e MC	456	memcpy(out, ctx->final, b);
	457	out += b;
	458	fix_len = 1;
	459	} else
	460	fix_len = 0;
	461
	462	if (!EVP_EncryptUpdate(ctx, out, outl, in, inl))
	463	return 0;
	464
	465	/*
	466	* if we have 'decrypted' a multiple of block size, make sure we have a
	467	* copy of this last block
	468	*/
	469	if (b > 1 && !ctx->buf_len) {
	470	*outl -= b;
	471	ctx->final_used = 1;
	472	memcpy(ctx->final, &out[*outl], b);
	473	} else
	474	ctx->final_used = 0;
	475
	476	if (fix_len)
	477	*outl += b;
	478
	479	return 1;
	480	}
d02b48c6	481
6b691a5c	482	int EVP_DecryptFinal(EVP_CIPHER_CTX ctx, unsigned char out, int *outl)
0f113f3e MC	483	{
	484	int ret;
	485	ret = EVP_DecryptFinal_ex(ctx, out, outl);
	486	return ret;
	487	}
581f1c84 DSH	488
581f1c84 DSH	489	int EVP_DecryptFinal_ex(EVP_CIPHER_CTX ctx, unsigned char out, int *outl)
0f113f3e MC	490	{
	491	int i, n;
	492	unsigned int b;
	493	*outl = 0;
	494
	495	if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) {
	496	i = ctx->cipher->do_cipher(ctx, out, NULL, 0);
	497	if (i < 0)
	498	return 0;
	499	else
	500	*outl = i;
	501	return 1;
	502	}
	503
	504	b = ctx->cipher->block_size;
	505	if (ctx->flags & EVP_CIPH_NO_PADDING) {
	506	if (ctx->buf_len) {
	507	EVPerr(EVP_F_EVP_DECRYPTFINAL_EX,
	508	EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH);
	509	return 0;
	510	}
	511	*outl = 0;
	512	return 1;
	513	}
	514	if (b > 1) {
	515	if (ctx->buf_len \|\| !ctx->final_used) {
	516	EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_WRONG_FINAL_BLOCK_LENGTH);
	517	return (0);
	518	}
	519	OPENSSL_assert(b <= sizeof ctx->final);
	520
	521	/*
	522	* The following assumes that the ciphertext has been authenticated.
	523	* Otherwise it provides a padding oracle.
	524	*/
	525	n = ctx->final[b - 1];
	526	if (n == 0 \|\| n > (int)b) {
	527	EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_BAD_DECRYPT);
	528	return (0);
	529	}
	530	for (i = 0; i < n; i++) {
	531	if (ctx->final[--b] != n) {
	532	EVPerr(EVP_F_EVP_DECRYPTFINAL_EX, EVP_R_BAD_DECRYPT);
	533	return (0);
	534	}
	535	}
	536	n = ctx->cipher->block_size - n;
	537	for (i = 0; i < n; i++)
	538	out[i] = ctx->final[i];
	539	*outl = n;
	540	} else
	541	*outl = 0;
	542	return (1);
	543	}
d02b48c6	544
6343829a	545	int EVP_CIPHER_CTX_set_key_length(EVP_CIPHER_CTX *c, int keylen)
0f113f3e MC	546	{
	547	if (c->cipher->flags & EVP_CIPH_CUSTOM_KEY_LENGTH)
	548	return EVP_CIPHER_CTX_ctrl(c, EVP_CTRL_SET_KEY_LENGTH, keylen, NULL);
	549	if (c->key_len == keylen)
	550	return 1;
	551	if ((keylen > 0) && (c->cipher->flags & EVP_CIPH_VARIABLE_LENGTH)) {
	552	c->key_len = keylen;
	553	return 1;
	554	}
	555	EVPerr(EVP_F_EVP_CIPHER_CTX_SET_KEY_LENGTH, EVP_R_INVALID_KEY_LENGTH);
	556	return 0;
	557	}
49528751	558
f2e5ca84	559	int EVP_CIPHER_CTX_set_padding(EVP_CIPHER_CTX *ctx, int pad)
0f113f3e MC	560	{
	561	if (pad)
	562	ctx->flags &= ~EVP_CIPH_NO_PADDING;
	563	else
	564	ctx->flags \|= EVP_CIPH_NO_PADDING;
	565	return 1;
	566	}
f2e5ca84	567
49528751 DSH	568	int EVP_CIPHER_CTX_ctrl(EVP_CIPHER_CTX ctx, int type, int arg, void ptr)
49528751 DSH	569	{
0f113f3e MC	570	int ret;
	571	if (!ctx->cipher) {
	572	EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_NO_CIPHER_SET);
	573	return 0;
	574	}
	575
	576	if (!ctx->cipher->ctrl) {
	577	EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL, EVP_R_CTRL_NOT_IMPLEMENTED);
	578	return 0;
	579	}
	580
	581	ret = ctx->cipher->ctrl(ctx, type, arg, ptr);
	582	if (ret == -1) {
	583	EVPerr(EVP_F_EVP_CIPHER_CTX_CTRL,
	584	EVP_R_CTRL_OPERATION_NOT_IMPLEMENTED);
	585	return 0;
	586	}
	587	return ret;
49528751	588	}
216659eb DSH	589
216659eb DSH	590	int EVP_CIPHER_CTX_rand_key(EVP_CIPHER_CTX ctx, unsigned char key)
0f113f3e MC	591	{
	592	if (ctx->cipher->flags & EVP_CIPH_RAND_KEY)
	593	return EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_RAND_KEY, 0, key);
	594	if (RAND_bytes(key, ctx->key_len) <= 0)
	595	return 0;
	596	return 1;
	597	}
216659eb	598
c2bf7208	599	int EVP_CIPHER_CTX_copy(EVP_CIPHER_CTX out, const EVP_CIPHER_CTX in)
0f113f3e MC	600	{
	601	if ((in == NULL) \|\| (in->cipher == NULL)) {
	602	EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, EVP_R_INPUT_NOT_INITIALIZED);
	603	return 0;
	604	}
c2bf7208	605	#ifndef OPENSSL_NO_ENGINE
0f113f3e MC	606	/* Make sure it's safe to copy a cipher context using an ENGINE */
	607	if (in->engine && !ENGINE_init(in->engine)) {
	608	EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, ERR_R_ENGINE_LIB);
	609	return 0;
	610	}
c2bf7208 DSH	611	#endif
c2bf7208 DSH	612
c0ca39bd	613	EVP_CIPHER_CTX_reset(out);
b4faea50	614	memcpy(out, in, sizeof(*out));
0f113f3e MC	615
	616	if (in->cipher_data && in->cipher->ctx_size) {
	617	out->cipher_data = OPENSSL_malloc(in->cipher->ctx_size);
90945fa3	618	if (out->cipher_data == NULL) {
0f113f3e MC	619	EVPerr(EVP_F_EVP_CIPHER_CTX_COPY, ERR_R_MALLOC_FAILURE);
	620	return 0;
	621	}
	622	memcpy(out->cipher_data, in->cipher_data, in->cipher->ctx_size);
	623	}
	624
	625	if (in->cipher->flags & EVP_CIPH_CUSTOM_COPY)
	626	return in->cipher->ctrl((EVP_CIPHER_CTX *)in, EVP_CTRL_COPY, 0, out);
	627	return 1;
	628	}