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author | Adam Langley <agl@google.com> | 2015-01-22 14:27:53 -0800 |
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committer | Adam Langley <agl@google.com> | 2015-01-30 16:52:14 -0800 |
commit | d9e397b599b13d642138480a28c14db7a136bf05 (patch) | |
tree | 34bab61dc4ce323b123ad4614dbc07e86ea2f9ef /src/crypto/cipher/cipher.c | |
download | external_boringssl-d9e397b599b13d642138480a28c14db7a136bf05.zip external_boringssl-d9e397b599b13d642138480a28c14db7a136bf05.tar.gz external_boringssl-d9e397b599b13d642138480a28c14db7a136bf05.tar.bz2 |
Initial commit of BoringSSL for Android.
Diffstat (limited to 'src/crypto/cipher/cipher.c')
-rw-r--r-- | src/crypto/cipher/cipher.c | 654 |
1 files changed, 654 insertions, 0 deletions
diff --git a/src/crypto/cipher/cipher.c b/src/crypto/cipher/cipher.c new file mode 100644 index 0000000..4bb4196 --- /dev/null +++ b/src/crypto/cipher/cipher.c @@ -0,0 +1,654 @@ +/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) + * All rights reserved. + * + * 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: + * 1. Redistributions of source code must retain the copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * "This product includes cryptographic software written by + * 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 + * 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 + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * 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 + * [including the GNU Public Licence.] */ + +#include <openssl/cipher.h> + +#include <assert.h> +#include <string.h> + +#include <openssl/err.h> +#include <openssl/mem.h> +#include <openssl/obj.h> + +#include "internal.h" + + +const EVP_CIPHER *EVP_get_cipherbynid(int nid) { + switch (nid) { + case NID_des_ede3_cbc: + return EVP_des_ede3_cbc(); + case NID_des_ede_cbc: + return EVP_des_cbc(); + case NID_aes_128_cbc: + return EVP_aes_128_cbc(); + case NID_aes_256_cbc: + return EVP_aes_256_cbc(); + default: + return NULL; + } +} + +void EVP_CIPHER_CTX_init(EVP_CIPHER_CTX *ctx) { + memset(ctx, 0, sizeof(EVP_CIPHER_CTX)); +} + +EVP_CIPHER_CTX *EVP_CIPHER_CTX_new(void) { + EVP_CIPHER_CTX *ctx = OPENSSL_malloc(sizeof(EVP_CIPHER_CTX)); + if (ctx) { + EVP_CIPHER_CTX_init(ctx); + } + return ctx; +} + +int EVP_CIPHER_CTX_cleanup(EVP_CIPHER_CTX *c) { + if (c->cipher != NULL && c->cipher->cleanup && !c->cipher->cleanup(c)) { + return 0; + } + + if (c->cipher_data) { + OPENSSL_cleanse(c->cipher_data, c->cipher->ctx_size); + OPENSSL_free(c->cipher_data); + } + + memset(c, 0, sizeof(EVP_CIPHER_CTX)); + return 1; +} + +void EVP_CIPHER_CTX_free(EVP_CIPHER_CTX *ctx) { + if (ctx) { + EVP_CIPHER_CTX_cleanup(ctx); + OPENSSL_free(ctx); + } +} + +int EVP_CIPHER_CTX_copy(EVP_CIPHER_CTX *out, const EVP_CIPHER_CTX *in) { + if (in == NULL || in->cipher == NULL) { + OPENSSL_PUT_ERROR(CIPHER, EVP_CIPHER_CTX_copy, CIPHER_R_INPUT_NOT_INITIALIZED); + return 0; + } + + EVP_CIPHER_CTX_cleanup(out); + memcpy(out, in, sizeof(EVP_CIPHER_CTX)); + + if (in->cipher_data && in->cipher->ctx_size) { + out->cipher_data = OPENSSL_malloc(in->cipher->ctx_size); + if (!out->cipher_data) { + OPENSSL_PUT_ERROR(CIPHER, 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; +} + +int EVP_CipherInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, + ENGINE *engine, const uint8_t *key, const uint8_t *iv, + int enc) { + if (enc == -1) { + enc = ctx->encrypt; + } else { + if (enc) { + enc = 1; + } + ctx->encrypt = enc; + } + + if (cipher) { + /* Ensure a context left 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) { + EVP_CIPHER_CTX_cleanup(ctx); + /* Restore encrypt and flags */ + ctx->encrypt = enc; + } + + ctx->cipher = cipher; + if (ctx->cipher->ctx_size) { + ctx->cipher_data = OPENSSL_malloc(ctx->cipher->ctx_size); + if (!ctx->cipher_data) { + OPENSSL_PUT_ERROR(CIPHER, 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)) { + OPENSSL_PUT_ERROR(CIPHER, EVP_CipherInit_ex, CIPHER_R_INITIALIZATION_ERROR); + return 0; + } + } + } else if (!ctx->cipher) { + OPENSSL_PUT_ERROR(CIPHER, EVP_CipherInit_ex, CIPHER_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; + /* fall-through */ + + case EVP_CIPH_CBC_MODE: + assert(EVP_CIPHER_CTX_iv_length(ctx) <= 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_EncryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, + ENGINE *impl, const uint8_t *key, const uint8_t *iv) { + return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 1); +} + +int EVP_DecryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, + ENGINE *impl, const uint8_t *key, const uint8_t *iv) { + return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 0); +} + +int EVP_EncryptUpdate(EVP_CIPHER_CTX *ctx, uint8_t *out, int *out_len, + const uint8_t *in, int in_len) { + int i, j, bl; + + if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) { + i = ctx->cipher->cipher(ctx, out, in, in_len); + if (i < 0) { + return 0; + } else { + *out_len = i; + } + return 1; + } + + if (in_len <= 0) { + *out_len = 0; + return in_len == 0; + } + + if (ctx->buf_len == 0 && (in_len & ctx->block_mask) == 0) { + if (ctx->cipher->cipher(ctx, out, in, in_len)) { + *out_len = in_len; + return 1; + } else { + *out_len = 0; + return 0; + } + } + + i = ctx->buf_len; + bl = ctx->cipher->block_size; + assert(bl <= (int)sizeof(ctx->buf)); + if (i != 0) { + if (i + in_len < bl) { + memcpy(&ctx->buf[i], in, in_len); + ctx->buf_len += in_len; + *out_len = 0; + return 1; + } else { + j = bl - i; + memcpy(&ctx->buf[i], in, j); + if (!ctx->cipher->cipher(ctx, out, ctx->buf, bl)) { + return 0; + } + in_len -= j; + in += j; + out += bl; + *out_len = bl; + } + } else { + *out_len = 0; + } + + i = in_len & ctx->block_mask; + in_len -= i; + if (in_len > 0) { + if (!ctx->cipher->cipher(ctx, out, in, in_len)) { + return 0; + } + *out_len += in_len; + } + + if (i != 0) { + memcpy(ctx->buf, &in[in_len], i); + } + ctx->buf_len = i; + return 1; +} + +int EVP_EncryptFinal_ex(EVP_CIPHER_CTX *ctx, uint8_t *out, int *out_len) { + int n, ret; + unsigned int i, b, bl; + + if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) { + ret = ctx->cipher->cipher(ctx, out, NULL, 0); + if (ret < 0) { + return 0; + } else { + *out_len = ret; + } + return 1; + } + + b = ctx->cipher->block_size; + assert(b <= sizeof(ctx->buf)); + if (b == 1) { + *out_len = 0; + return 1; + } + + bl = ctx->buf_len; + if (ctx->flags & EVP_CIPH_NO_PADDING) { + if (bl) { + OPENSSL_PUT_ERROR(CIPHER, EVP_EncryptFinal_ex, + CIPHER_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH); + return 0; + } + *out_len = 0; + return 1; + } + + n = b - bl; + for (i = bl; i < b; i++) { + ctx->buf[i] = n; + } + ret = ctx->cipher->cipher(ctx, out, ctx->buf, b); + + if (ret) { + *out_len = b; + } + + return ret; +} + +int EVP_DecryptUpdate(EVP_CIPHER_CTX *ctx, uint8_t *out, int *out_len, + const uint8_t *in, int in_len) { + int fix_len; + unsigned int b; + + if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) { + int r = ctx->cipher->cipher(ctx, out, in, in_len); + if (r < 0) { + *out_len = 0; + return 0; + } else { + *out_len = r; + } + return 1; + } + + if (in_len <= 0) { + *out_len = 0; + return in_len == 0; + } + + if (ctx->flags & EVP_CIPH_NO_PADDING) { + return EVP_EncryptUpdate(ctx, out, out_len, in, in_len); + } + + b = ctx->cipher->block_size; + 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, out_len, in, in_len)) { + 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) { + *out_len -= b; + ctx->final_used = 1; + memcpy(ctx->final, &out[*out_len], b); + } else { + ctx->final_used = 0; + } + + if (fix_len) { + *out_len += b; + } + + return 1; +} + +int EVP_DecryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *out_len) { + int i, n; + unsigned int b; + *out_len = 0; + + if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) { + i = ctx->cipher->cipher(ctx, out, NULL, 0); + if (i < 0) { + return 0; + } else { + *out_len = i; + } + return 1; + } + + b = ctx->cipher->block_size; + if (ctx->flags & EVP_CIPH_NO_PADDING) { + if (ctx->buf_len) { + OPENSSL_PUT_ERROR(CIPHER, EVP_DecryptFinal_ex, + CIPHER_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH); + return 0; + } + *out_len = 0; + return 1; + } + + if (b > 1) { + if (ctx->buf_len || !ctx->final_used) { + OPENSSL_PUT_ERROR(CIPHER, EVP_DecryptFinal_ex, + CIPHER_R_WRONG_FINAL_BLOCK_LENGTH); + return 0; + } + 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) { + OPENSSL_PUT_ERROR(CIPHER, EVP_DecryptFinal_ex, CIPHER_R_BAD_DECRYPT); + return 0; + } + + for (i = 0; i < n; i++) { + if (ctx->final[--b] != n) { + OPENSSL_PUT_ERROR(CIPHER, EVP_DecryptFinal_ex, CIPHER_R_BAD_DECRYPT); + return 0; + } + } + + n = ctx->cipher->block_size - n; + for (i = 0; i < n; i++) { + out[i] = ctx->final[i]; + } + *out_len = n; + } else { + *out_len = 0; + } + + return 1; +} + +int EVP_Cipher(EVP_CIPHER_CTX *ctx, uint8_t *out, const uint8_t *in, + size_t in_len) { + return ctx->cipher->cipher(ctx, out, in, in_len); +} + +int EVP_CipherUpdate(EVP_CIPHER_CTX *ctx, uint8_t *out, int *out_len, + const uint8_t *in, int in_len) { + if (ctx->encrypt) { + return EVP_EncryptUpdate(ctx, out, out_len, in, in_len); + } else { + return EVP_DecryptUpdate(ctx, out, out_len, in, in_len); + } +} + +int EVP_CipherFinal_ex(EVP_CIPHER_CTX *ctx, uint8_t *out, int *out_len) { + if (ctx->encrypt) { + return EVP_EncryptFinal_ex(ctx, out, out_len); + } else { + return EVP_DecryptFinal_ex(ctx, out, out_len); + } +} + +const EVP_CIPHER *EVP_CIPHER_CTX_cipher(const EVP_CIPHER_CTX *ctx) { + return ctx->cipher; +} + +int EVP_CIPHER_CTX_nid(const EVP_CIPHER_CTX *ctx) { + return ctx->cipher->nid; +} + +unsigned EVP_CIPHER_CTX_block_size(const EVP_CIPHER_CTX *ctx) { + return ctx->cipher->block_size; +} + +unsigned EVP_CIPHER_CTX_key_length(const EVP_CIPHER_CTX *ctx) { + return ctx->key_len; +} + +unsigned EVP_CIPHER_CTX_iv_length(const EVP_CIPHER_CTX *ctx) { + return ctx->cipher->iv_len; +} + +void *EVP_CIPHER_CTX_get_app_data(const EVP_CIPHER_CTX *ctx) { + return ctx->app_data; +} + +void EVP_CIPHER_CTX_set_app_data(EVP_CIPHER_CTX *ctx, void *data) { + ctx->app_data = data; +} + +uint32_t EVP_CIPHER_CTX_flags(const EVP_CIPHER_CTX *ctx) { + return ctx->cipher->flags & ~EVP_CIPH_MODE_MASK; +} + +uint32_t EVP_CIPHER_CTX_mode(const EVP_CIPHER_CTX *ctx) { + return ctx->cipher->flags & EVP_CIPH_MODE_MASK; +} + +int EVP_CIPHER_CTX_ctrl(EVP_CIPHER_CTX *ctx, int command, int arg, void *ptr) { + int ret; + if (!ctx->cipher) { + OPENSSL_PUT_ERROR(CIPHER, EVP_CIPHER_CTX_ctrl, CIPHER_R_NO_CIPHER_SET); + return 0; + } + + if (!ctx->cipher->ctrl) { + OPENSSL_PUT_ERROR(CIPHER, EVP_CIPHER_CTX_ctrl, CIPHER_R_CTRL_NOT_IMPLEMENTED); + return 0; + } + + ret = ctx->cipher->ctrl(ctx, command, arg, ptr); + if (ret == -1) { + OPENSSL_PUT_ERROR(CIPHER, EVP_CIPHER_CTX_ctrl, + CIPHER_R_CTRL_OPERATION_NOT_IMPLEMENTED); + return 0; + } + + return ret; +} + +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_set_key_length(EVP_CIPHER_CTX *c, unsigned key_len) { + if (c->key_len == key_len) { + return 1; + } + + if (key_len == 0 || !(c->cipher->flags & EVP_CIPH_VARIABLE_LENGTH)) { + OPENSSL_PUT_ERROR(CIPHER, EVP_CIPHER_CTX_set_key_length, + CIPHER_R_INVALID_KEY_LENGTH); + return 0; + } + + c->key_len = key_len; + return 1; +} + +int EVP_CIPHER_nid(const EVP_CIPHER *cipher) { return cipher->nid; } + +const char *EVP_CIPHER_name(const EVP_CIPHER *cipher) { + return OBJ_nid2sn(cipher->nid); +} + +unsigned EVP_CIPHER_block_size(const EVP_CIPHER *cipher) { + return cipher->block_size; +} + +unsigned EVP_CIPHER_key_length(const EVP_CIPHER *cipher) { + return cipher->key_len; +} + +unsigned EVP_CIPHER_iv_length(const EVP_CIPHER *cipher) { + return cipher->iv_len; +} + +uint32_t EVP_CIPHER_flags(const EVP_CIPHER *cipher) { + return cipher->flags & ~EVP_CIPH_MODE_MASK; +} + +uint32_t EVP_CIPHER_mode(const EVP_CIPHER *cipher) { + return cipher->flags & EVP_CIPH_MODE_MASK; +} + +int EVP_CipherInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, + const uint8_t *key, const uint8_t *iv, int enc) { + if (cipher) { + EVP_CIPHER_CTX_init(ctx); + } + return EVP_CipherInit_ex(ctx, cipher, NULL, key, iv, enc); +} + +int EVP_EncryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, + const uint8_t *key, const uint8_t *iv) { + return EVP_CipherInit(ctx, cipher, key, iv, 1); +} + +int EVP_DecryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, + const uint8_t *key, const uint8_t *iv) { + return EVP_CipherInit(ctx, cipher, key, iv, 0); +} + +int EVP_add_cipher_alias(const char *a, const char *b) { + return 1; +} + +const EVP_CIPHER *EVP_get_cipherbyname(const char *name) { + if (OPENSSL_strcasecmp(name, "rc4") == 0) { + return EVP_rc4(); + } else if (OPENSSL_strcasecmp(name, "des-cbc") == 0) { + return EVP_des_cbc(); + } else if (OPENSSL_strcasecmp(name, "3des-cbc") == 0 || + OPENSSL_strcasecmp(name, "3des") == 0) { + return EVP_des_ede3_cbc(); + } else if (OPENSSL_strcasecmp(name, "aes-128-cbc") == 0) { + return EVP_aes_128_cbc(); + } else if (OPENSSL_strcasecmp(name, "aes-256-cbc") == 0) { + return EVP_aes_256_cbc(); + } else if (OPENSSL_strcasecmp(name, "aes-128-ctr") == 0) { + return EVP_aes_128_ctr(); + } else if (OPENSSL_strcasecmp(name, "aes-256-ctr") == 0) { + return EVP_aes_256_ctr(); + } else if (OPENSSL_strcasecmp(name, "aes-128-ecb") == 0) { + return EVP_aes_128_ecb(); + } else if (OPENSSL_strcasecmp(name, "aes-256-ecb") == 0) { + return EVP_aes_256_ecb(); + } + + return NULL; +} |