| /** |
| * \file rsa.h |
| * |
| * \brief The RSA public-key cryptosystem |
| * |
| * Copyright (C) 2006-2014, ARM Limited, All Rights Reserved |
| * |
| * This file is part of mbed TLS (https://www.polarssl.org) |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License along |
| * with this program; if not, write to the Free Software Foundation, Inc., |
| * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| */ |
| #ifndef POLARSSL_RSA_H |
| #define POLARSSL_RSA_H |
| |
| #if !defined(POLARSSL_CONFIG_FILE) |
| #include "config.h" |
| #else |
| #include POLARSSL_CONFIG_FILE |
| #endif |
| |
| #include "bignum.h" |
| #include "md.h" |
| |
| #if defined(POLARSSL_THREADING_C) |
| #include "threading.h" |
| #endif |
| |
| /* |
| * RSA Error codes |
| */ |
| #define POLARSSL_ERR_RSA_BAD_INPUT_DATA -0x4080 /**< Bad input parameters to function. */ |
| #define POLARSSL_ERR_RSA_INVALID_PADDING -0x4100 /**< Input data contains invalid padding and is rejected. */ |
| #define POLARSSL_ERR_RSA_KEY_GEN_FAILED -0x4180 /**< Something failed during generation of a key. */ |
| #define POLARSSL_ERR_RSA_KEY_CHECK_FAILED -0x4200 /**< Key failed to pass the libraries validity check. */ |
| #define POLARSSL_ERR_RSA_PUBLIC_FAILED -0x4280 /**< The public key operation failed. */ |
| #define POLARSSL_ERR_RSA_PRIVATE_FAILED -0x4300 /**< The private key operation failed. */ |
| #define POLARSSL_ERR_RSA_VERIFY_FAILED -0x4380 /**< The PKCS#1 verification failed. */ |
| #define POLARSSL_ERR_RSA_OUTPUT_TOO_LARGE -0x4400 /**< The output buffer for decryption is not large enough. */ |
| #define POLARSSL_ERR_RSA_RNG_FAILED -0x4480 /**< The random generator failed to generate non-zeros. */ |
| |
| /* |
| * RSA constants |
| */ |
| #define RSA_PUBLIC 0 |
| #define RSA_PRIVATE 1 |
| |
| #define RSA_PKCS_V15 0 |
| #define RSA_PKCS_V21 1 |
| |
| #define RSA_SIGN 1 |
| #define RSA_CRYPT 2 |
| |
| #define RSA_SALT_LEN_ANY -1 |
| |
| /* |
| * The above constants may be used even if the RSA module is compile out, |
| * eg for alternative (PKCS#11) RSA implemenations in the PK layers. |
| */ |
| #if defined(POLARSSL_RSA_C) |
| |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| /** |
| * \brief RSA context structure |
| */ |
| typedef struct |
| { |
| int ver; /*!< always 0 */ |
| size_t len; /*!< size(N) in chars */ |
| |
| mpi N; /*!< public modulus */ |
| mpi E; /*!< public exponent */ |
| |
| mpi D; /*!< private exponent */ |
| mpi P; /*!< 1st prime factor */ |
| mpi Q; /*!< 2nd prime factor */ |
| mpi DP; /*!< D % (P - 1) */ |
| mpi DQ; /*!< D % (Q - 1) */ |
| mpi QP; /*!< 1 / (Q % P) */ |
| |
| mpi RN; /*!< cached R^2 mod N */ |
| mpi RP; /*!< cached R^2 mod P */ |
| mpi RQ; /*!< cached R^2 mod Q */ |
| |
| mpi Vi; /*!< cached blinding value */ |
| mpi Vf; /*!< cached un-blinding value */ |
| |
| int padding; /*!< RSA_PKCS_V15 for 1.5 padding and |
| RSA_PKCS_v21 for OAEP/PSS */ |
| int hash_id; /*!< Hash identifier of md_type_t as |
| specified in the md.h header file |
| for the EME-OAEP and EMSA-PSS |
| encoding */ |
| #if defined(POLARSSL_THREADING_C) |
| threading_mutex_t mutex; /*!< Thread-safety mutex */ |
| #endif |
| } |
| rsa_context; |
| |
| /** |
| * \brief Initialize an RSA context |
| * |
| * Note: Set padding to RSA_PKCS_V21 for the RSAES-OAEP |
| * encryption scheme and the RSASSA-PSS signature scheme. |
| * |
| * \param ctx RSA context to be initialized |
| * \param padding RSA_PKCS_V15 or RSA_PKCS_V21 |
| * \param hash_id RSA_PKCS_V21 hash identifier |
| * |
| * \note The hash_id parameter is actually ignored |
| * when using RSA_PKCS_V15 padding. |
| * |
| * \note Choice of padding mode is strictly enforced for private key |
| * operations, since there might be security concerns in |
| * mixing padding modes. For public key operations it's merely |
| * a default value, which can be overriden by calling specific |
| * rsa_rsaes_xxx or rsa_rsassa_xxx functions. |
| * |
| * \note The chosen hash is always used for OEAP encryption. |
| * For PSS signatures, it's always used for making signatures, |
| * but can be overriden (and always is, if set to |
| * POLARSSL_MD_NONE) for verifying them. |
| */ |
| void rsa_init( rsa_context *ctx, |
| int padding, |
| int hash_id); |
| |
| /** |
| * \brief Set padding for an already initialized RSA context |
| * See \c rsa_init() for details. |
| * |
| * \param ctx RSA context to be set |
| * \param padding RSA_PKCS_V15 or RSA_PKCS_V21 |
| * \param hash_id RSA_PKCS_V21 hash identifier |
| */ |
| void rsa_set_padding( rsa_context *ctx, int padding, int hash_id); |
| |
| /** |
| * \brief Generate an RSA keypair |
| * |
| * \param ctx RSA context that will hold the key |
| * \param f_rng RNG function |
| * \param p_rng RNG parameter |
| * \param nbits size of the public key in bits |
| * \param exponent public exponent (e.g., 65537) |
| * |
| * \note rsa_init() must be called beforehand to setup |
| * the RSA context. |
| * |
| * \return 0 if successful, or an POLARSSL_ERR_RSA_XXX error code |
| */ |
| int rsa_gen_key( rsa_context *ctx, |
| int (*f_rng)(void *, unsigned char *, size_t), |
| void *p_rng, |
| unsigned int nbits, int exponent ); |
| |
| /** |
| * \brief Check a public RSA key |
| * |
| * \param ctx RSA context to be checked |
| * |
| * \return 0 if successful, or an POLARSSL_ERR_RSA_XXX error code |
| */ |
| int rsa_check_pubkey( const rsa_context *ctx ); |
| |
| /** |
| * \brief Check a private RSA key |
| * |
| * \param ctx RSA context to be checked |
| * |
| * \return 0 if successful, or an POLARSSL_ERR_RSA_XXX error code |
| */ |
| int rsa_check_privkey( const rsa_context *ctx ); |
| |
| /** |
| * \brief Check a public-private RSA key pair. |
| * Check each of the contexts, and make sure they match. |
| * |
| * \param pub RSA context holding the public key |
| * \param prv RSA context holding the private key |
| * |
| * \return 0 if successful, or an POLARSSL_ERR_RSA_XXX error code |
| */ |
| int rsa_check_pub_priv( const rsa_context *pub, const rsa_context *prv ); |
| |
| /** |
| * \brief Do an RSA public key operation |
| * |
| * \param ctx RSA context |
| * \param input input buffer |
| * \param output output buffer |
| * |
| * \return 0 if successful, or an POLARSSL_ERR_RSA_XXX error code |
| * |
| * \note This function does NOT take care of message |
| * padding. Also, be sure to set input[0] = 0 or assure that |
| * input is smaller than N. |
| * |
| * \note The input and output buffers must be large |
| * enough (eg. 128 bytes if RSA-1024 is used). |
| */ |
| int rsa_public( rsa_context *ctx, |
| const unsigned char *input, |
| unsigned char *output ); |
| |
| /** |
| * \brief Do an RSA private key operation |
| * |
| * \param ctx RSA context |
| * \param f_rng RNG function (Needed for blinding) |
| * \param p_rng RNG parameter |
| * \param input input buffer |
| * \param output output buffer |
| * |
| * \return 0 if successful, or an POLARSSL_ERR_RSA_XXX error code |
| * |
| * \note The input and output buffers must be large |
| * enough (eg. 128 bytes if RSA-1024 is used). |
| */ |
| int rsa_private( rsa_context *ctx, |
| int (*f_rng)(void *, unsigned char *, size_t), |
| void *p_rng, |
| const unsigned char *input, |
| unsigned char *output ); |
| |
| /** |
| * \brief Generic wrapper to perform a PKCS#1 encryption using the |
| * mode from the context. Add the message padding, then do an |
| * RSA operation. |
| * |
| * \param ctx RSA context |
| * \param f_rng RNG function (Needed for padding and PKCS#1 v2.1 encoding |
| * and RSA_PRIVATE) |
| * \param p_rng RNG parameter |
| * \param mode RSA_PUBLIC or RSA_PRIVATE |
| * \param ilen contains the plaintext length |
| * \param input buffer holding the data to be encrypted |
| * \param output buffer that will hold the ciphertext |
| * |
| * \return 0 if successful, or an POLARSSL_ERR_RSA_XXX error code |
| * |
| * \note The output buffer must be as large as the size |
| * of ctx->N (eg. 128 bytes if RSA-1024 is used). |
| */ |
| int rsa_pkcs1_encrypt( rsa_context *ctx, |
| int (*f_rng)(void *, unsigned char *, size_t), |
| void *p_rng, |
| int mode, size_t ilen, |
| const unsigned char *input, |
| unsigned char *output ); |
| |
| /** |
| * \brief Perform a PKCS#1 v1.5 encryption (RSAES-PKCS1-v1_5-ENCRYPT) |
| * |
| * \param ctx RSA context |
| * \param f_rng RNG function (Needed for padding and RSA_PRIVATE) |
| * \param p_rng RNG parameter |
| * \param mode RSA_PUBLIC or RSA_PRIVATE |
| * \param ilen contains the plaintext length |
| * \param input buffer holding the data to be encrypted |
| * \param output buffer that will hold the ciphertext |
| * |
| * \return 0 if successful, or an POLARSSL_ERR_RSA_XXX error code |
| * |
| * \note The output buffer must be as large as the size |
| * of ctx->N (eg. 128 bytes if RSA-1024 is used). |
| */ |
| int rsa_rsaes_pkcs1_v15_encrypt( rsa_context *ctx, |
| int (*f_rng)(void *, unsigned char *, size_t), |
| void *p_rng, |
| int mode, size_t ilen, |
| const unsigned char *input, |
| unsigned char *output ); |
| |
| /** |
| * \brief Perform a PKCS#1 v2.1 OAEP encryption (RSAES-OAEP-ENCRYPT) |
| * |
| * \param ctx RSA context |
| * \param f_rng RNG function (Needed for padding and PKCS#1 v2.1 encoding |
| * and RSA_PRIVATE) |
| * \param p_rng RNG parameter |
| * \param mode RSA_PUBLIC or RSA_PRIVATE |
| * \param label buffer holding the custom label to use |
| * \param label_len contains the label length |
| * \param ilen contains the plaintext length |
| * \param input buffer holding the data to be encrypted |
| * \param output buffer that will hold the ciphertext |
| * |
| * \return 0 if successful, or an POLARSSL_ERR_RSA_XXX error code |
| * |
| * \note The output buffer must be as large as the size |
| * of ctx->N (eg. 128 bytes if RSA-1024 is used). |
| */ |
| int rsa_rsaes_oaep_encrypt( rsa_context *ctx, |
| int (*f_rng)(void *, unsigned char *, size_t), |
| void *p_rng, |
| int mode, |
| const unsigned char *label, size_t label_len, |
| size_t ilen, |
| const unsigned char *input, |
| unsigned char *output ); |
| |
| /** |
| * \brief Generic wrapper to perform a PKCS#1 decryption using the |
| * mode from the context. Do an RSA operation, then remove |
| * the message padding |
| * |
| * \param ctx RSA context |
| * \param f_rng RNG function (Only needed for RSA_PRIVATE) |
| * \param p_rng RNG parameter |
| * \param mode RSA_PUBLIC or RSA_PRIVATE |
| * \param olen will contain the plaintext length |
| * \param input buffer holding the encrypted data |
| * \param output buffer that will hold the plaintext |
| * \param output_max_len maximum length of the output buffer |
| * |
| * \return 0 if successful, or an POLARSSL_ERR_RSA_XXX error code |
| * |
| * \note The output buffer must be as large as the size |
| * of ctx->N (eg. 128 bytes if RSA-1024 is used) otherwise |
| * an error is thrown. |
| */ |
| int rsa_pkcs1_decrypt( rsa_context *ctx, |
| int (*f_rng)(void *, unsigned char *, size_t), |
| void *p_rng, |
| int mode, size_t *olen, |
| const unsigned char *input, |
| unsigned char *output, |
| size_t output_max_len ); |
| |
| /** |
| * \brief Perform a PKCS#1 v1.5 decryption (RSAES-PKCS1-v1_5-DECRYPT) |
| * |
| * \param ctx RSA context |
| * \param f_rng RNG function (Only needed for RSA_PRIVATE) |
| * \param p_rng RNG parameter |
| * \param mode RSA_PUBLIC or RSA_PRIVATE |
| * \param olen will contain the plaintext length |
| * \param input buffer holding the encrypted data |
| * \param output buffer that will hold the plaintext |
| * \param output_max_len maximum length of the output buffer |
| * |
| * \return 0 if successful, or an POLARSSL_ERR_RSA_XXX error code |
| * |
| * \note The output buffer must be as large as the size |
| * of ctx->N (eg. 128 bytes if RSA-1024 is used) otherwise |
| * an error is thrown. |
| */ |
| int rsa_rsaes_pkcs1_v15_decrypt( rsa_context *ctx, |
| int (*f_rng)(void *, unsigned char *, size_t), |
| void *p_rng, |
| int mode, size_t *olen, |
| const unsigned char *input, |
| unsigned char *output, |
| size_t output_max_len ); |
| |
| /** |
| * \brief Perform a PKCS#1 v2.1 OAEP decryption (RSAES-OAEP-DECRYPT) |
| * |
| * \param ctx RSA context |
| * \param f_rng RNG function (Only needed for RSA_PRIVATE) |
| * \param p_rng RNG parameter |
| * \param mode RSA_PUBLIC or RSA_PRIVATE |
| * \param label buffer holding the custom label to use |
| * \param label_len contains the label length |
| * \param olen will contain the plaintext length |
| * \param input buffer holding the encrypted data |
| * \param output buffer that will hold the plaintext |
| * \param output_max_len maximum length of the output buffer |
| * |
| * \return 0 if successful, or an POLARSSL_ERR_RSA_XXX error code |
| * |
| * \note The output buffer must be as large as the size |
| * of ctx->N (eg. 128 bytes if RSA-1024 is used) otherwise |
| * an error is thrown. |
| */ |
| int rsa_rsaes_oaep_decrypt( rsa_context *ctx, |
| int (*f_rng)(void *, unsigned char *, size_t), |
| void *p_rng, |
| int mode, |
| const unsigned char *label, size_t label_len, |
| size_t *olen, |
| const unsigned char *input, |
| unsigned char *output, |
| size_t output_max_len ); |
| |
| /** |
| * \brief Generic wrapper to perform a PKCS#1 signature using the |
| * mode from the context. Do a private RSA operation to sign |
| * a message digest |
| * |
| * \param ctx RSA context |
| * \param f_rng RNG function (Needed for PKCS#1 v2.1 encoding and for |
| * RSA_PRIVATE) |
| * \param p_rng RNG parameter |
| * \param mode RSA_PUBLIC or RSA_PRIVATE |
| * \param md_alg a POLARSSL_MD_* (use POLARSSL_MD_NONE for signing raw data) |
| * \param hashlen message digest length (for POLARSSL_MD_NONE only) |
| * \param hash buffer holding the message digest |
| * \param sig buffer that will hold the ciphertext |
| * |
| * \return 0 if the signing operation was successful, |
| * or an POLARSSL_ERR_RSA_XXX error code |
| * |
| * \note The "sig" buffer must be as large as the size |
| * of ctx->N (eg. 128 bytes if RSA-1024 is used). |
| * |
| * \note In case of PKCS#1 v2.1 encoding, see comments on |
| * \note \c rsa_rsassa_pss_sign() for details on md_alg and hash_id. |
| */ |
| int rsa_pkcs1_sign( rsa_context *ctx, |
| int (*f_rng)(void *, unsigned char *, size_t), |
| void *p_rng, |
| int mode, |
| md_type_t md_alg, |
| unsigned int hashlen, |
| const unsigned char *hash, |
| unsigned char *sig ); |
| |
| /** |
| * \brief Perform a PKCS#1 v1.5 signature (RSASSA-PKCS1-v1_5-SIGN) |
| * |
| * \param ctx RSA context |
| * \param f_rng RNG function (Only needed for RSA_PRIVATE) |
| * \param p_rng RNG parameter |
| * \param mode RSA_PUBLIC or RSA_PRIVATE |
| * \param md_alg a POLARSSL_MD_* (use POLARSSL_MD_NONE for signing raw data) |
| * \param hashlen message digest length (for POLARSSL_MD_NONE only) |
| * \param hash buffer holding the message digest |
| * \param sig buffer that will hold the ciphertext |
| * |
| * \return 0 if the signing operation was successful, |
| * or an POLARSSL_ERR_RSA_XXX error code |
| * |
| * \note The "sig" buffer must be as large as the size |
| * of ctx->N (eg. 128 bytes if RSA-1024 is used). |
| */ |
| int rsa_rsassa_pkcs1_v15_sign( rsa_context *ctx, |
| int (*f_rng)(void *, unsigned char *, size_t), |
| void *p_rng, |
| int mode, |
| md_type_t md_alg, |
| unsigned int hashlen, |
| const unsigned char *hash, |
| unsigned char *sig ); |
| |
| /** |
| * \brief Perform a PKCS#1 v2.1 PSS signature (RSASSA-PSS-SIGN) |
| * |
| * \param ctx RSA context |
| * \param f_rng RNG function (Needed for PKCS#1 v2.1 encoding and for |
| * RSA_PRIVATE) |
| * \param p_rng RNG parameter |
| * \param mode RSA_PUBLIC or RSA_PRIVATE |
| * \param md_alg a POLARSSL_MD_* (use POLARSSL_MD_NONE for signing raw data) |
| * \param hashlen message digest length (for POLARSSL_MD_NONE only) |
| * \param hash buffer holding the message digest |
| * \param sig buffer that will hold the ciphertext |
| * |
| * \return 0 if the signing operation was successful, |
| * or an POLARSSL_ERR_RSA_XXX error code |
| * |
| * \note The "sig" buffer must be as large as the size |
| * of ctx->N (eg. 128 bytes if RSA-1024 is used). |
| * |
| * \note The hash_id in the RSA context is the one used for the |
| * encoding. md_alg in the function call is the type of hash |
| * that is encoded. According to RFC 3447 it is advised to |
| * keep both hashes the same. |
| */ |
| int rsa_rsassa_pss_sign( rsa_context *ctx, |
| int (*f_rng)(void *, unsigned char *, size_t), |
| void *p_rng, |
| int mode, |
| md_type_t md_alg, |
| unsigned int hashlen, |
| const unsigned char *hash, |
| unsigned char *sig ); |
| |
| /** |
| * \brief Generic wrapper to perform a PKCS#1 verification using the |
| * mode from the context. Do a public RSA operation and check |
| * the message digest |
| * |
| * \param ctx points to an RSA public key |
| * \param f_rng RNG function (Only needed for RSA_PRIVATE) |
| * \param p_rng RNG parameter |
| * \param mode RSA_PUBLIC or RSA_PRIVATE |
| * \param md_alg a POLARSSL_MD_* (use POLARSSL_MD_NONE for signing raw data) |
| * \param hashlen message digest length (for POLARSSL_MD_NONE only) |
| * \param hash buffer holding the message digest |
| * \param sig buffer holding the ciphertext |
| * |
| * \return 0 if the verify operation was successful, |
| * or an POLARSSL_ERR_RSA_XXX error code |
| * |
| * \note The "sig" buffer must be as large as the size |
| * of ctx->N (eg. 128 bytes if RSA-1024 is used). |
| * |
| * \note In case of PKCS#1 v2.1 encoding, see comments on |
| * \c rsa_rsassa_pss_verify() about md_alg and hash_id. |
| */ |
| int rsa_pkcs1_verify( rsa_context *ctx, |
| int (*f_rng)(void *, unsigned char *, size_t), |
| void *p_rng, |
| int mode, |
| md_type_t md_alg, |
| unsigned int hashlen, |
| const unsigned char *hash, |
| const unsigned char *sig ); |
| |
| /** |
| * \brief Perform a PKCS#1 v1.5 verification (RSASSA-PKCS1-v1_5-VERIFY) |
| * |
| * \param ctx points to an RSA public key |
| * \param f_rng RNG function (Only needed for RSA_PRIVATE) |
| * \param p_rng RNG parameter |
| * \param mode RSA_PUBLIC or RSA_PRIVATE |
| * \param md_alg a POLARSSL_MD_* (use POLARSSL_MD_NONE for signing raw data) |
| * \param hashlen message digest length (for POLARSSL_MD_NONE only) |
| * \param hash buffer holding the message digest |
| * \param sig buffer holding the ciphertext |
| * |
| * \return 0 if the verify operation was successful, |
| * or an POLARSSL_ERR_RSA_XXX error code |
| * |
| * \note The "sig" buffer must be as large as the size |
| * of ctx->N (eg. 128 bytes if RSA-1024 is used). |
| */ |
| int rsa_rsassa_pkcs1_v15_verify( rsa_context *ctx, |
| int (*f_rng)(void *, unsigned char *, size_t), |
| void *p_rng, |
| int mode, |
| md_type_t md_alg, |
| unsigned int hashlen, |
| const unsigned char *hash, |
| const unsigned char *sig ); |
| |
| /** |
| * \brief Perform a PKCS#1 v2.1 PSS verification (RSASSA-PSS-VERIFY) |
| * (This is the "simple" version.) |
| * |
| * \param ctx points to an RSA public key |
| * \param f_rng RNG function (Only needed for RSA_PRIVATE) |
| * \param p_rng RNG parameter |
| * \param mode RSA_PUBLIC or RSA_PRIVATE |
| * \param md_alg a POLARSSL_MD_* (use POLARSSL_MD_NONE for signing raw data) |
| * \param hashlen message digest length (for POLARSSL_MD_NONE only) |
| * \param hash buffer holding the message digest |
| * \param sig buffer holding the ciphertext |
| * |
| * \return 0 if the verify operation was successful, |
| * or an POLARSSL_ERR_RSA_XXX error code |
| * |
| * \note The "sig" buffer must be as large as the size |
| * of ctx->N (eg. 128 bytes if RSA-1024 is used). |
| * |
| * \note The hash_id in the RSA context is the one used for the |
| * verification. md_alg in the function call is the type of |
| * hash that is verified. According to RFC 3447 it is advised to |
| * keep both hashes the same. If hash_id in the RSA context is |
| * unset, the md_alg from the function call is used. |
| */ |
| int rsa_rsassa_pss_verify( rsa_context *ctx, |
| int (*f_rng)(void *, unsigned char *, size_t), |
| void *p_rng, |
| int mode, |
| md_type_t md_alg, |
| unsigned int hashlen, |
| const unsigned char *hash, |
| const unsigned char *sig ); |
| |
| /** |
| * \brief Perform a PKCS#1 v2.1 PSS verification (RSASSA-PSS-VERIFY) |
| * (This is the version with "full" options.) |
| * |
| * \param ctx points to an RSA public key |
| * \param f_rng RNG function (Only needed for RSA_PRIVATE) |
| * \param p_rng RNG parameter |
| * \param mode RSA_PUBLIC or RSA_PRIVATE |
| * \param md_alg a POLARSSL_MD_* (use POLARSSL_MD_NONE for signing raw data) |
| * \param hashlen message digest length (for POLARSSL_MD_NONE only) |
| * \param hash buffer holding the message digest |
| * \param mgf1_hash_id message digest used for mask generation |
| * \param expected_salt_len Length of the salt used in padding, use |
| * RSA_SALT_LEN_ANY to accept any salt length |
| * \param sig buffer holding the ciphertext |
| * |
| * \return 0 if the verify operation was successful, |
| * or an POLARSSL_ERR_RSA_XXX error code |
| * |
| * \note The "sig" buffer must be as large as the size |
| * of ctx->N (eg. 128 bytes if RSA-1024 is used). |
| * |
| * \note The hash_id in the RSA context is ignored. |
| */ |
| int rsa_rsassa_pss_verify_ext( rsa_context *ctx, |
| int (*f_rng)(void *, unsigned char *, size_t), |
| void *p_rng, |
| int mode, |
| md_type_t md_alg, |
| unsigned int hashlen, |
| const unsigned char *hash, |
| md_type_t mgf1_hash_id, |
| int expected_salt_len, |
| const unsigned char *sig ); |
| |
| /** |
| * \brief Copy the components of an RSA context |
| * |
| * \param dst Destination context |
| * \param src Source context |
| * |
| * \return O on success, |
| * POLARSSL_ERR_MPI_MALLOC_FAILED on memory allocation failure |
| */ |
| int rsa_copy( rsa_context *dst, const rsa_context *src ); |
| |
| /** |
| * \brief Free the components of an RSA key |
| * |
| * \param ctx RSA Context to free |
| */ |
| void rsa_free( rsa_context *ctx ); |
| |
| /** |
| * \brief Checkup routine |
| * |
| * \return 0 if successful, or 1 if the test failed |
| */ |
| int rsa_self_test( int verbose ); |
| |
| #ifdef __cplusplus |
| } |
| #endif |
| |
| #endif /* POLARSSL_RSA_C */ |
| |
| #endif /* rsa.h */ |