diff options
Diffstat (limited to 'crypto/ecdh/ech_ossl.c')
| -rw-r--r-- | crypto/ecdh/ech_ossl.c | 251 |
1 files changed, 120 insertions, 131 deletions
diff --git a/crypto/ecdh/ech_ossl.c b/crypto/ecdh/ech_ossl.c index 0596341fa6..e60cf10b9c 100644 --- a/crypto/ecdh/ech_ossl.c +++ b/crypto/ecdh/ech_ossl.c @@ -21,7 +21,7 @@ * are met: * * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. + * 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 @@ -67,8 +67,6 @@ * */ - - #include <string.h> #include <limits.h> @@ -81,25 +79,25 @@ #include <openssl/bn.h> static int ecdh_compute_key(void *out, size_t len, const EC_POINT *pub_key, - EC_KEY *ecdh, - void *(*KDF)(const void *in, size_t inlen, void *out, size_t *outlen)); + EC_KEY *ecdh, + void *(*KDF) (const void *in, size_t inlen, + void *out, size_t *outlen)); static ECDH_METHOD openssl_ecdh_meth = { - "OpenSSL ECDH method", - ecdh_compute_key, + "OpenSSL ECDH method", + ecdh_compute_key, #if 0 - NULL, /* init */ - NULL, /* finish */ + NULL, /* init */ + NULL, /* finish */ #endif - ECDH_FLAG_FIPS_METHOD, /* flags */ - NULL /* app_data */ + ECDH_FLAG_FIPS_METHOD, /* flags */ + NULL /* app_data */ }; const ECDH_METHOD *ECDH_OpenSSL(void) - { - return &openssl_ecdh_meth; - } - +{ + return &openssl_ecdh_meth; +} /*- * This implementation is based on the following primitives in the IEEE 1363 standard: @@ -108,122 +106,113 @@ const ECDH_METHOD *ECDH_OpenSSL(void) * Finally an optional KDF is applied. */ static int ecdh_compute_key(void *out, size_t outlen, const EC_POINT *pub_key, - EC_KEY *ecdh, - void *(*KDF)(const void *in, size_t inlen, void *out, size_t *outlen)) - { - BN_CTX *ctx; - EC_POINT *tmp=NULL; - BIGNUM *x=NULL, *y=NULL; - const BIGNUM *priv_key; - const EC_GROUP* group; - int ret= -1; - size_t buflen, len; - unsigned char *buf=NULL; - - if (outlen > INT_MAX) - { - ECDHerr(ECDH_F_ECDH_COMPUTE_KEY,ERR_R_MALLOC_FAILURE); /* sort of, anyway */ - return -1; - } - - if ((ctx = BN_CTX_new()) == NULL) goto err; - BN_CTX_start(ctx); - x = BN_CTX_get(ctx); - y = BN_CTX_get(ctx); - - priv_key = EC_KEY_get0_private_key(ecdh); - if (priv_key == NULL) - { - ECDHerr(ECDH_F_ECDH_COMPUTE_KEY,ECDH_R_NO_PRIVATE_VALUE); - goto err; - } - - group = EC_KEY_get0_group(ecdh); - - if (EC_KEY_get_flags(ecdh) & EC_FLAG_COFACTOR_ECDH) - { - if (!EC_GROUP_get_cofactor(group, x, ctx) || - !BN_mul(x, x, priv_key, ctx)) - { - ECDHerr(ECDH_F_ECDH_COMPUTE_KEY, ERR_R_MALLOC_FAILURE); - goto err; - } - priv_key = x; - } - - if ((tmp=EC_POINT_new(group)) == NULL) - { - ECDHerr(ECDH_F_ECDH_COMPUTE_KEY,ERR_R_MALLOC_FAILURE); - goto err; - } - - if (!EC_POINT_mul(group, tmp, NULL, pub_key, priv_key, ctx)) - { - ECDHerr(ECDH_F_ECDH_COMPUTE_KEY,ECDH_R_POINT_ARITHMETIC_FAILURE); - goto err; - } - - if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) == NID_X9_62_prime_field) - { - if (!EC_POINT_get_affine_coordinates_GFp(group, tmp, x, y, ctx)) - { - ECDHerr(ECDH_F_ECDH_COMPUTE_KEY,ECDH_R_POINT_ARITHMETIC_FAILURE); - goto err; - } - } + EC_KEY *ecdh, + void *(*KDF) (const void *in, size_t inlen, + void *out, size_t *outlen)) +{ + BN_CTX *ctx; + EC_POINT *tmp = NULL; + BIGNUM *x = NULL, *y = NULL; + const BIGNUM *priv_key; + const EC_GROUP *group; + int ret = -1; + size_t buflen, len; + unsigned char *buf = NULL; + + if (outlen > INT_MAX) { + ECDHerr(ECDH_F_ECDH_COMPUTE_KEY, ERR_R_MALLOC_FAILURE); /* sort of, + * anyway */ + return -1; + } + + if ((ctx = BN_CTX_new()) == NULL) + goto err; + BN_CTX_start(ctx); + x = BN_CTX_get(ctx); + y = BN_CTX_get(ctx); + + priv_key = EC_KEY_get0_private_key(ecdh); + if (priv_key == NULL) { + ECDHerr(ECDH_F_ECDH_COMPUTE_KEY, ECDH_R_NO_PRIVATE_VALUE); + goto err; + } + + group = EC_KEY_get0_group(ecdh); + + if (EC_KEY_get_flags(ecdh) & EC_FLAG_COFACTOR_ECDH) { + if (!EC_GROUP_get_cofactor(group, x, ctx) || + !BN_mul(x, x, priv_key, ctx)) { + ECDHerr(ECDH_F_ECDH_COMPUTE_KEY, ERR_R_MALLOC_FAILURE); + goto err; + } + priv_key = x; + } + + if ((tmp = EC_POINT_new(group)) == NULL) { + ECDHerr(ECDH_F_ECDH_COMPUTE_KEY, ERR_R_MALLOC_FAILURE); + goto err; + } + + if (!EC_POINT_mul(group, tmp, NULL, pub_key, priv_key, ctx)) { + ECDHerr(ECDH_F_ECDH_COMPUTE_KEY, ECDH_R_POINT_ARITHMETIC_FAILURE); + goto err; + } + + if (EC_METHOD_get_field_type(EC_GROUP_method_of(group)) == + NID_X9_62_prime_field) { + if (!EC_POINT_get_affine_coordinates_GFp(group, tmp, x, y, ctx)) { + ECDHerr(ECDH_F_ECDH_COMPUTE_KEY, ECDH_R_POINT_ARITHMETIC_FAILURE); + goto err; + } + } #ifndef OPENSSL_NO_EC2M - else - { - if (!EC_POINT_get_affine_coordinates_GF2m(group, tmp, x, y, ctx)) - { - ECDHerr(ECDH_F_ECDH_COMPUTE_KEY,ECDH_R_POINT_ARITHMETIC_FAILURE); - goto err; - } - } + else { + if (!EC_POINT_get_affine_coordinates_GF2m(group, tmp, x, y, ctx)) { + ECDHerr(ECDH_F_ECDH_COMPUTE_KEY, ECDH_R_POINT_ARITHMETIC_FAILURE); + goto err; + } + } #endif - buflen = (EC_GROUP_get_degree(group) + 7)/8; - len = BN_num_bytes(x); - if (len > buflen) - { - ECDHerr(ECDH_F_ECDH_COMPUTE_KEY,ERR_R_INTERNAL_ERROR); - goto err; - } - if ((buf = OPENSSL_malloc(buflen)) == NULL) - { - ECDHerr(ECDH_F_ECDH_COMPUTE_KEY,ERR_R_MALLOC_FAILURE); - goto err; - } - - memset(buf, 0, buflen - len); - if (len != (size_t)BN_bn2bin(x, buf + buflen - len)) - { - ECDHerr(ECDH_F_ECDH_COMPUTE_KEY,ERR_R_BN_LIB); - goto err; - } - - if (KDF != 0) - { - if (KDF(buf, buflen, out, &outlen) == NULL) - { - ECDHerr(ECDH_F_ECDH_COMPUTE_KEY,ECDH_R_KDF_FAILED); - goto err; - } - ret = outlen; - } - else - { - /* no KDF, just copy as much as we can */ - if (outlen > buflen) - outlen = buflen; - memcpy(out, buf, outlen); - ret = outlen; - } - -err: - if (tmp) EC_POINT_free(tmp); - if (ctx) BN_CTX_end(ctx); - if (ctx) BN_CTX_free(ctx); - if (buf) OPENSSL_free(buf); - return(ret); - } + buflen = (EC_GROUP_get_degree(group) + 7) / 8; + len = BN_num_bytes(x); + if (len > buflen) { + ECDHerr(ECDH_F_ECDH_COMPUTE_KEY, ERR_R_INTERNAL_ERROR); + goto err; + } + if ((buf = OPENSSL_malloc(buflen)) == NULL) { + ECDHerr(ECDH_F_ECDH_COMPUTE_KEY, ERR_R_MALLOC_FAILURE); + goto err; + } + + memset(buf, 0, buflen - len); + if (len != (size_t)BN_bn2bin(x, buf + buflen - len)) { + ECDHerr(ECDH_F_ECDH_COMPUTE_KEY, ERR_R_BN_LIB); + goto err; + } + + if (KDF != 0) { + if (KDF(buf, buflen, out, &outlen) == NULL) { + ECDHerr(ECDH_F_ECDH_COMPUTE_KEY, ECDH_R_KDF_FAILED); + goto err; + } + ret = outlen; + } else { + /* no KDF, just copy as much as we can */ + if (outlen > buflen) + outlen = buflen; + memcpy(out, buf, outlen); + ret = outlen; + } + + err: + if (tmp) + EC_POINT_free(tmp); + if (ctx) + BN_CTX_end(ctx); + if (ctx) + BN_CTX_free(ctx); + if (buf) + OPENSSL_free(buf); + return (ret); +} |