diff options
Diffstat (limited to 'openssl/crypto/evp/evp_enc.c')
| -rw-r--r-- | openssl/crypto/evp/evp_enc.c | 1087 |
1 files changed, 533 insertions, 554 deletions
diff --git a/openssl/crypto/evp/evp_enc.c b/openssl/crypto/evp/evp_enc.c index 7b1842a52..65f0e0244 100644 --- a/openssl/crypto/evp/evp_enc.c +++ b/openssl/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 @@ -62,626 +62,605 @@ #include <openssl/err.h> #include <openssl/rand.h> #ifndef OPENSSL_NO_ENGINE -#include <openssl/engine.h> +# include <openssl/engine.h> #endif #ifdef OPENSSL_FIPS -#include <openssl/fips.h> +# include <openssl/fips.h> #endif -#include "constant_time_locl.h" #include "evp_locl.h" #ifdef OPENSSL_FIPS -#define M_do_cipher(ctx, out, in, inl) FIPS_cipher(ctx, out, in, inl) +# define M_do_cipher(ctx, out, in, inl) FIPS_cipher(ctx, out, in, inl) #else -#define M_do_cipher(ctx, out, in, inl) ctx->cipher->do_cipher(ctx, out, in, inl) +# define M_do_cipher(ctx, out, in, inl) ctx->cipher->do_cipher(ctx, out, in, inl) #endif - -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(EVP_CIPHER_CTX)); + /* ctx->cipher=NULL; */ +} 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; - } +{ + 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, - 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; - } + 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; + /* + * 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; - } + 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; + 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 #ifdef OPENSSL_FIPS - if (FIPS_mode()) - return FIPS_cipherinit(ctx, cipher, key, iv, enc); + if (FIPS_mode()) { + const EVP_CIPHER *fcipher; + if (cipher) + fcipher = evp_get_fips_cipher(cipher); + if (fcipher) + cipher = fcipher; + return FIPS_cipherinit(ctx, cipher, key, iv, enc); + } #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; - 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_EX, EVP_R_INITIALIZATION_ERROR); - return 0; - } - } - } - else if(!ctx->cipher) - { - EVPerr(EVP_F_EVP_CIPHERINIT_EX, EVP_R_NO_CIPHER_SET); - return 0; - } + 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: + skip_to_init: #endif #ifdef OPENSSL_FIPS - if (FIPS_mode()) - return FIPS_cipherinit(ctx, cipher, key, iv, enc); + if (FIPS_mode()) + return FIPS_cipherinit(ctx, cipher, key, iv, enc); #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(!(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; - break; - } - } - - 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; - } + /* 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; + break; + } + } + + 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); - } + 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); - } +{ + 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, - const unsigned char *key, const 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_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); - } + 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_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, - const unsigned char *in, int inl) - { - int i,j,bl; - - if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) - { - i = M_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(M_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(!M_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(!M_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 = M_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 (M_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 (!M_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 (!M_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 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 = M_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=M_do_cipher(ctx,out,ctx->buf,b); - - - if(ret) - *outl=b; - - return ret; - } +{ + int n, ret; + unsigned int i, b, bl; + + if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) { + ret = M_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 = M_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; - - if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) - { - fix_len = M_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; - } + const unsigned char *in, int inl) +{ + int fix_len; + unsigned int b; + + if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) { + fix_len = M_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 ret; - ret = EVP_DecryptFinal_ex(ctx, out, outl); - return ret; - } +{ + int ret; + ret = EVP_DecryptFinal_ex(ctx, out, outl); + return ret; +} int EVP_DecryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl) - { - unsigned int i, b; - unsigned char pad, padding_good; - *outl=0; - - if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) - { - int ret = M_do_cipher(ctx, out, NULL, 0); - if (ret < 0) - return 0; - else - *outl = ret; - return 1; - } - - b=(unsigned int)(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); - pad=ctx->final[b-1]; - - padding_good = (unsigned char)(~constant_time_is_zero_8(pad)); - padding_good &= constant_time_ge_8(b, pad); - - for (i = 1; i < b; ++i) - { - unsigned char is_pad_index = constant_time_lt_8(i, pad); - unsigned char pad_byte_good = constant_time_eq_8(ctx->final[b-i-1], pad); - padding_good &= constant_time_select_8(is_pad_index, pad_byte_good, 0xff); - } - - /* - * At least 1 byte is always padding, so we always write b - 1 - * bytes to avoid a timing leak. The caller is required to have |b| - * bytes space in |out| by the API contract. - */ - for (i = 0; i < b - 1; ++i) - out[i] = ctx->final[i] & padding_good; - /* Safe cast: for a good padding, EVP_MAX_IV_LENGTH >= b >= pad */ - *outl = padding_good & ((unsigned char)(b - pad)); - return padding_good & 1; - } - else - { - *outl = 0; - return 1; - } - } +{ + int i, n; + unsigned int b; + *outl = 0; + + if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) { + i = M_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) - { - if (ctx) - { - EVP_CIPHER_CTX_cleanup(ctx); - OPENSSL_free(ctx); - } - } +{ + if (ctx) { + EVP_CIPHER_CTX_cleanup(ctx); + OPENSSL_free(ctx); + } +} int EVP_CIPHER_CTX_cleanup(EVP_CIPHER_CTX *c) - { +{ #ifndef OPENSSL_FIPS - 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); - } - if (c->cipher_data) - OPENSSL_free(c->cipher_data); + 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); + } + if (c->cipher_data) + OPENSSL_free(c->cipher_data); #endif #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); + 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 #ifdef OPENSSL_FIPS - FIPS_cipher_ctx_cleanup(c); + FIPS_cipher_ctx_cleanup(c); #endif - memset(c,0,sizeof(EVP_CIPHER_CTX)); - return 1; - } + memset(c, 0, sizeof(EVP_CIPHER_CTX)); + 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; - } +{ + 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; - } +{ + 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; - } + /* 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; - } + 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; +} |