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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/ecdsa/ecdsa_asn1.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/ecdsa/ecdsa_asn1.c')
-rw-r--r-- | src/crypto/ecdsa/ecdsa_asn1.c | 116 |
1 files changed, 116 insertions, 0 deletions
diff --git a/src/crypto/ecdsa/ecdsa_asn1.c b/src/crypto/ecdsa/ecdsa_asn1.c new file mode 100644 index 0000000..b3c6a87 --- /dev/null +++ b/src/crypto/ecdsa/ecdsa_asn1.c @@ -0,0 +1,116 @@ +/* ==================================================================== + * Copyright (c) 1998-2005 The OpenSSL Project. All rights reserved. + * + * 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 above 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 acknowledgment: + * "This product includes software developed by the OpenSSL Project + * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" + * + * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to + * endorse or promote products derived from this software without + * prior written permission. For written permission, please contact + * openssl-core@OpenSSL.org. + * + * 5. Products derived from this software may not be called "OpenSSL" + * nor may "OpenSSL" appear in their names without prior written + * permission of the OpenSSL Project. + * + * 6. Redistributions of any form whatsoever must retain the following + * acknowledgment: + * "This product includes software developed by the OpenSSL Project + * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" + * + * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY + * EXPRESSED 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 OpenSSL PROJECT OR + * ITS 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. + * ==================================================================== + * + * This product includes cryptographic software written by Eric Young + * (eay@cryptsoft.com). This product includes software written by Tim + * Hudson (tjh@cryptsoft.com). */ + +#include <openssl/ecdsa.h> + +#include <openssl/asn1.h> +#include <openssl/asn1t.h> +#include <openssl/ec_key.h> + +#include "../ec/internal.h" + + +DECLARE_ASN1_FUNCTIONS_const(ECDSA_SIG); +DECLARE_ASN1_ENCODE_FUNCTIONS_const(ECDSA_SIG, ECDSA_SIG); + +ASN1_SEQUENCE(ECDSA_SIG) = { + ASN1_SIMPLE(ECDSA_SIG, r, CBIGNUM), + ASN1_SIMPLE(ECDSA_SIG, s, CBIGNUM), +} ASN1_SEQUENCE_END(ECDSA_SIG); + +IMPLEMENT_ASN1_FUNCTIONS_const(ECDSA_SIG); + +size_t ECDSA_size(const EC_KEY *key) { + size_t ret, i, group_order_size; + ASN1_INTEGER bs; + BIGNUM *order = NULL; + unsigned char buf[4]; + const EC_GROUP *group; + + if (key->ecdsa_meth && key->ecdsa_meth->group_order_size) { + group_order_size = key->ecdsa_meth->group_order_size(key); + } else { + size_t num_bits; + + if (key == NULL) { + return 0; + } + group = EC_KEY_get0_group(key); + if (group == NULL) { + return 0; + } + + order = BN_new(); + if (order == NULL) { + return 0; + } + if (!EC_GROUP_get_order(group, order, NULL)) { + BN_clear_free(order); + return 0; + } + + num_bits = BN_num_bits(order); + group_order_size = (num_bits + 7) / 8; + } + + bs.length = group_order_size; + bs.data = buf; + bs.type = V_ASN1_INTEGER; + /* If the top bit is set the ASN.1 encoding is 1 larger. */ + buf[0] = 0xff; + + i = i2d_ASN1_INTEGER(&bs, NULL); + i += i; /* r and s */ + ret = ASN1_object_size(1, i, V_ASN1_SEQUENCE); + BN_clear_free(order); + return ret; +} |