2009-01-03 22:22:43 +01:00
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/**
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* \file rsa.h
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*/
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#ifndef XYSSL_RSA_H
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#define XYSSL_RSA_H
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2009-01-03 22:24:11 +01:00
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#include "polarssl/bignum.h"
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2009-01-03 22:22:43 +01:00
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#define XYSSL_ERR_RSA_BAD_INPUT_DATA -0x0400
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#define XYSSL_ERR_RSA_INVALID_PADDING -0x0410
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#define XYSSL_ERR_RSA_KEY_GEN_FAILED -0x0420
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#define XYSSL_ERR_RSA_KEY_CHECK_FAILED -0x0430
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#define XYSSL_ERR_RSA_PUBLIC_FAILED -0x0440
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#define XYSSL_ERR_RSA_PRIVATE_FAILED -0x0450
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#define XYSSL_ERR_RSA_VERIFY_FAILED -0x0460
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/*
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* PKCS#1 constants
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*/
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#define RSA_RAW 0
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#define RSA_MD2 2
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#define RSA_MD4 3
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#define RSA_MD5 4
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#define RSA_SHA1 5
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#define RSA_SHA256 6
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#define RSA_PUBLIC 0
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#define RSA_PRIVATE 1
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#define RSA_PKCS_V15 0
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#define RSA_PKCS_V21 1
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#define RSA_SIGN 1
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#define RSA_CRYPT 2
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/*
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* DigestInfo ::= SEQUENCE {
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* digestAlgorithm DigestAlgorithmIdentifier,
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* digest Digest }
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*
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* DigestAlgorithmIdentifier ::= AlgorithmIdentifier
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*
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* Digest ::= OCTET STRING
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*/
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#define ASN1_HASH_MDX \
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"\x30\x20\x30\x0C\x06\x08\x2A\x86\x48" \
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"\x86\xF7\x0D\x02\x00\x05\x00\x04\x10"
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#define ASN1_HASH_SHA1 \
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"\x30\x21\x30\x09\x06\x05\x2B\x0E\x03" \
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"\x02\x1A\x05\x00\x04\x14"
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/**
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* \brief RSA context structure
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*/
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typedef struct
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{
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int ver; /*!< always 0 */
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int len; /*!< size(N) in chars */
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mpi N; /*!< public modulus */
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mpi E; /*!< public exponent */
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mpi D; /*!< private exponent */
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mpi P; /*!< 1st prime factor */
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mpi Q; /*!< 2nd prime factor */
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mpi DP; /*!< D % (P - 1) */
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mpi DQ; /*!< D % (Q - 1) */
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mpi QP; /*!< 1 / (Q % P) */
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mpi RN; /*!< cached R^2 mod N */
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mpi RP; /*!< cached R^2 mod P */
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mpi RQ; /*!< cached R^2 mod Q */
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int padding; /*!< 1.5 or OAEP/PSS */
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int hash_id; /*!< hash identifier */
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int (*f_rng)(void *); /*!< RNG function */
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void *p_rng; /*!< RNG parameter */
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}
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rsa_context;
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* \brief Initialize an RSA context
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*
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* \param ctx RSA context to be initialized
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* \param padding RSA_PKCS_V15 or RSA_PKCS_V21
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* \param hash_id RSA_PKCS_V21 hash identifier
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* \param f_rng RNG function
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* \param p_rng RNG parameter
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*
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* \note The hash_id parameter is actually ignored
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* when using RSA_PKCS_V15 padding.
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*
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* \note Currently (xyssl-0.8), RSA_PKCS_V21 padding
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* is not supported.
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*/
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void rsa_init( rsa_context *ctx,
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int padding,
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int hash_id,
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int (*f_rng)(void *),
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void *p_rng );
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/**
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* \brief Generate an RSA keypair
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*
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* \param ctx RSA context that will hold the key
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* \param nbits size of the public key in bits
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* \param exponent public exponent (e.g., 65537)
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*
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* \note rsa_init() must be called beforehand to setup
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* the RSA context (especially f_rng and p_rng).
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*
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* \return 0 if successful, or an XYSSL_ERR_RSA_XXX error code
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*/
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int rsa_gen_key( rsa_context *ctx, int nbits, int exponent );
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/**
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* \brief Check a public RSA key
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*
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* \param ctx RSA context to be checked
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*
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* \return 0 if successful, or an XYSSL_ERR_RSA_XXX error code
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*/
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int rsa_check_pubkey( rsa_context *ctx );
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/**
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* \brief Check a private RSA key
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*
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* \param ctx RSA context to be checked
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*
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* \return 0 if successful, or an XYSSL_ERR_RSA_XXX error code
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*/
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int rsa_check_privkey( rsa_context *ctx );
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/**
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* \brief Do an RSA public key operation
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*
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* \param ctx RSA context
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* \param input input buffer
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* \param output output buffer
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*
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* \return 0 if successful, or an XYSSL_ERR_RSA_XXX error code
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*
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* \note This function does NOT take care of message
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* padding. Also, be sure to set input[0] = 0.
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*
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* \note The input and output buffers must be large
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* enough (eg. 128 bytes if RSA-1024 is used).
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*/
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int rsa_public( rsa_context *ctx,
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unsigned char *input,
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unsigned char *output );
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/**
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* \brief Do an RSA private key operation
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*
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* \param ctx RSA context
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* \param input input buffer
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* \param output output buffer
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*
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* \return 0 if successful, or an XYSSL_ERR_RSA_XXX error code
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*
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* \note The input and output buffers must be large
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* enough (eg. 128 bytes if RSA-1024 is used).
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*/
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int rsa_private( rsa_context *ctx,
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unsigned char *input,
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unsigned char *output );
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/**
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* \brief Add the message padding, then do an RSA operation
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*
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* \param ctx RSA context
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* \param mode RSA_PUBLIC or RSA_PRIVATE
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* \param ilen contains the the plaintext length
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* \param input buffer holding the data to be encrypted
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* \param output buffer that will hold the ciphertext
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*
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* \return 0 if successful, or an XYSSL_ERR_RSA_XXX error code
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*
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* \note The output buffer must be as large as the size
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* of ctx->N (eg. 128 bytes if RSA-1024 is used).
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*/
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int rsa_pkcs1_encrypt( rsa_context *ctx,
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int mode, int ilen,
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unsigned char *input,
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unsigned char *output );
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/**
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* \brief Do an RSA operation, then remove the message padding
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*
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* \param ctx RSA context
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* \param mode RSA_PUBLIC or RSA_PRIVATE
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* \param input buffer holding the encrypted data
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* \param output buffer that will hold the plaintext
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* \param olen will contain the plaintext length
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*
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* \return 0 if successful, or an XYSSL_ERR_RSA_XXX error code
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*
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* \note The output buffer must be as large as the size
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* of ctx->N (eg. 128 bytes if RSA-1024 is used).
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*/
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int rsa_pkcs1_decrypt( rsa_context *ctx,
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int mode, int *olen,
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unsigned char *input,
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unsigned char *output );
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/**
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* \brief Do a private RSA to sign a message digest
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*
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* \param ctx RSA context
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* \param mode RSA_PUBLIC or RSA_PRIVATE
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* \param hash_id RSA_RAW, RSA_MD{2,4,5} or RSA_SHA{1,256}
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* \param hashlen message digest length (for RSA_RAW only)
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* \param hash buffer holding the message digest
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* \param sig buffer that will hold the ciphertext
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*
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* \return 0 if the signing operation was successful,
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* or an XYSSL_ERR_RSA_XXX error code
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*
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* \note The "sig" buffer must be as large as the size
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* of ctx->N (eg. 128 bytes if RSA-1024 is used).
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*/
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int rsa_pkcs1_sign( rsa_context *ctx,
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int mode,
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int hash_id,
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int hashlen,
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unsigned char *hash,
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unsigned char *sig );
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/**
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* \brief Do a public RSA and check the message digest
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*
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* \param ctx points to an RSA public key
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* \param mode RSA_PUBLIC or RSA_PRIVATE
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* \param hash_id RSA_RAW, RSA_MD{2,4,5} or RSA_SHA{1,256}
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* \param hashlen message digest length (for RSA_RAW only)
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* \param hash buffer holding the message digest
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* \param sig buffer holding the ciphertext
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*
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* \return 0 if the verify operation was successful,
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* or an XYSSL_ERR_RSA_XXX error code
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*
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* \note The "sig" buffer must be as large as the size
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* of ctx->N (eg. 128 bytes if RSA-1024 is used).
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*/
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int rsa_pkcs1_verify( rsa_context *ctx,
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int mode,
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int hash_id,
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int hashlen,
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unsigned char *hash,
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unsigned char *sig );
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/**
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* \brief Free the components of an RSA key
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*/
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void rsa_free( rsa_context *ctx );
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/**
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* \brief Checkup routine
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*
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* \return 0 if successful, or 1 if the test failed
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*/
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int rsa_self_test( int verbose );
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#ifdef __cplusplus
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}
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#endif
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#endif /* rsa.h */
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