X-Git-Url: https://git.openssl.org/?p=openssl.git;a=blobdiff_plain;f=crypto%2Fevp%2Fevp_enc.c;h=242874c5f646237ba15039280c97b3e8cfe669bb;hp=9abb9855ff4ecdfd30a96c84bc2ed7d7fc789f29;hb=16f8d4ebf0fd4847fa83d9c61f4150273cb4f533;hpb=f0446ca8d746ff138a892588e33597411f59f5fa diff --git a/crypto/evp/evp_enc.c b/crypto/evp/evp_enc.c index 9abb9855ff..242874c5f6 100644 --- a/crypto/evp/evp_enc.c +++ b/crypto/evp/evp_enc.c @@ -5,21 +5,21 @@ * 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: @@ -34,10 +34,10 @@ * 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 + * 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 @@ -49,7 +49,7 @@ * 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 @@ -60,337 +60,576 @@ #include "cryptlib.h" #include #include +#include +#ifndef OPENSSL_NO_ENGINE +# include +#endif #include "evp_locl.h" -#include - -const char *EVP_version="EVP" OPENSSL_VERSION_PTEXT; +const char EVP_version[] = "EVP" OPENSSL_VERSION_PTEXT; void EVP_CIPHER_CTX_init(EVP_CIPHER_CTX *ctx) - { - memset(ctx,0,sizeof(EVP_CIPHER_CTX)); - /* ctx->cipher=NULL; */ - } +{ + memset(ctx, 0, sizeof(*ctx)); +} + +EVP_CIPHER_CTX *EVP_CIPHER_CTX_new(void) +{ + EVP_CIPHER_CTX *ctx = OPENSSL_malloc(sizeof(*ctx)); + if (ctx) + EVP_CIPHER_CTX_init(ctx); + return ctx; +} int EVP_CipherInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, - unsigned char *key, unsigned char *iv, int enc) - { - if(enc && (enc != -1)) enc = 1; - if (cipher) - { - ctx->cipher=cipher; - ctx->cipher_data=OPENSSL_malloc(ctx->cipher->ctx_size); - ctx->key_len = cipher->key_len; - ctx->flags = 0; - if(ctx->cipher->flags & EVP_CIPH_CTRL_INIT) { - if(!EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_INIT, 0, NULL)) { - EVPerr(EVP_F_EVP_CIPHERINIT, EVP_R_INITIALIZATION_ERROR); - return 0; - } - } - } else if(!ctx->cipher) { - EVPerr(EVP_F_EVP_CIPHERINIT, EVP_R_NO_CIPHER_SET); - return 0; - } - - /* we assume block size is a power of 2 in *cryptUpdate */ - assert(ctx->cipher->block_size == 1 - || ctx->cipher->block_size == 8 - || ctx->cipher->block_size == 16); - - if(!(EVP_CIPHER_CTX_flags(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; - - case EVP_CIPH_CBC_MODE: - - if(iv) memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx)); - memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx)); - break; - - default: - return 0; - break; - } - } - - if(key || (ctx->cipher->flags & EVP_CIPH_ALWAYS_CALL_INIT)) { - if(!ctx->cipher->init(ctx,key,iv,enc)) return 0; - } - if(enc != -1) ctx->encrypt=enc; - ctx->buf_len=0; - ctx->final_used=0; - ctx->block_mask=ctx->cipher->block_size-1; - return 1; - } + const unsigned char *key, const unsigned char *iv, int enc) +{ + if (cipher) + EVP_CIPHER_CTX_init(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 unecessary. + */ + if (ctx->engine && ctx->cipher && (!cipher || + (cipher + && (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_cleanup(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 + * mispellings 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_malloc(ctx->cipher->ctx_size); + if (!ctx->cipher_data) { + 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_CTX_flags(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, - 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); - } + 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)); - } +{ + 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, - unsigned char *key, unsigned char *iv) - { - return EVP_CipherInit(ctx, cipher, key, iv, 1); - } + 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, - unsigned char *key, unsigned char *iv) - { - return EVP_CipherInit(ctx, cipher, key, iv, 0); - } + 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); +} int EVP_EncryptUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl, - unsigned char *in, int inl) - { - int i,j,bl; - - 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; - bl=ctx->cipher->block_size; - if (i != 0) - { - if (i+inl < bl) - { - memcpy(&(ctx->buf[i]),in,inl); - ctx->buf_len+=inl; - *outl=0; - return 1; - } - else - { - j=bl-i; - memcpy(&(ctx->buf[i]),in,j); - if(!ctx->cipher->do_cipher(ctx,out,ctx->buf,bl)) return 0; - inl-=j; - in+=j; - 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; - } + const unsigned char *in, int inl) +{ + int i, j, bl; + + if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) { + 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 (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; + bl = ctx->cipher->block_size; + OPENSSL_assert(bl <= (int)sizeof(ctx->buf)); + if (i != 0) { + if (i + inl < bl) { + memcpy(&(ctx->buf[i]), in, inl); + ctx->buf_len += inl; + *outl = 0; + return 1; + } else { + j = bl - i; + memcpy(&(ctx->buf[i]), in, j); + if (!ctx->cipher->do_cipher(ctx, out, ctx->buf, bl)) + return 0; + inl -= j; + in += j; + 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 i,n,b,bl,ret; - - b=ctx->cipher->block_size; - if (b == 1) - { - *outl=0; - return 1; - } - bl=ctx->buf_len; - if (ctx->flags & EVP_CIPH_NO_PADDING) - { - EVP_CIPHER_CTX_cleanup(ctx); - if(bl) - { - EVPerr(EVP_F_EVP_ENCRYPTFINAL,EVP_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH); - return 0; - } - *outl = 0; - return 1; - } - - n=b-bl; - for (i=bl; ibuf[i]=n; - ret=ctx->cipher->do_cipher(ctx,out,ctx->buf,b); - - EVP_CIPHER_CTX_cleanup(ctx); - - if(ret) - *outl=b; - - return ret; - } +{ + 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, - unsigned char *in, int inl) - { - int b; - - if (inl == 0) - { - *outl=0; - return 1; - } - - if (ctx->flags & EVP_CIPH_NO_PADDING) - return EVP_EncryptUpdate(ctx, out, outl, in, inl); - - b=ctx->cipher->block_size; - if(ctx->final_used) - { - memcpy(out,ctx->final,b); - out+=b; - } - - 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) - { - if(!ctx->final_used) - { - *outl-=b; - ctx->final_used=1; - } - memcpy(ctx->final,&out[*outl],b); - } - else if(ctx->final_used) - { - ctx->final_used=0; - *outl+=b; - } - return 1; - } + const unsigned char *in, int inl) +{ + int fix_len; + unsigned int b; + + if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) { + 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); + + b = ctx->cipher->block_size; + OPENSSL_assert(b <= sizeof ctx->final); + + if (ctx->final_used) { + 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 i,b; - int n; - - *outl=0; - b=ctx->cipher->block_size; - if (ctx->flags & EVP_CIPH_NO_PADDING) - { - if(ctx->buf_len) - { - EVPerr(EVP_F_EVP_DECRYPTFINAL,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,EVP_R_WRONG_FINAL_BLOCK_LENGTH); - return(0); - } - n=ctx->final[b-1]; - if (n > b) - { - EVPerr(EVP_F_EVP_DECRYPTFINAL,EVP_R_BAD_DECRYPT); - return(0); - } - for (i=0; ifinal[--b] != n) - { - EVPerr(EVP_F_EVP_DECRYPTFINAL,EVP_R_BAD_DECRYPT); - return(0); - } - } - n=ctx->cipher->block_size-n; - for (i=0; ifinal[i]; - *outl=n; - } - else - *outl=0; - return(1); - } +{ + 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); +} + +void EVP_CIPHER_CTX_free(EVP_CIPHER_CTX *ctx) +{ + EVP_CIPHER_CTX_cleanup(ctx); + OPENSSL_free(ctx); +} int EVP_CIPHER_CTX_cleanup(EVP_CIPHER_CTX *c) - { - if ((c->cipher != NULL) && (c->cipher->cleanup != NULL)) - { - if(!c->cipher->cleanup(c)) return 0; - } - OPENSSL_free(c->cipher_data); - memset(c,0,sizeof(EVP_CIPHER_CTX)); - return 1; - } +{ + if (!c) + return 0; + if (c->cipher != NULL) { + if (c->cipher->cleanup && !c->cipher->cleanup(c)) + return 0; + /* Cleanse cipher context data */ + if (c->cipher_data) + OPENSSL_cleanse(c->cipher_data, c->cipher->ctx_size); + } + OPENSSL_free(c->cipher_data); +#ifndef OPENSSL_NO_ENGINE + if (c->engine) + /* + * The EVP_CIPHER we used belongs to an ENGINE, release the + * functional reference we held for this reason. + */ + ENGINE_finish(c->engine); +#endif + memset(c, 0, sizeof(*c)); + 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; - } +{ + 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; - } +{ + 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 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_cleanup(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) { + 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; }